Periodic Switch In The Primary Circuit Of The Supply Transformer Patents (Class 315/219)
  • Patent number: 10848599
    Abstract: A data transmission method includes: establishing, by a server, a connection with a client according to a transmission control protocol (TCP) through a gateway with a synchronous proxy mechanism; acquiring, by the server, sequence number conversion information and converting a first TCP sequence number of a first data packet to be sent to the client according to the sequence number conversion information, so that the first TCP sequence number is matched, by the server, with a first acknowledgment number of the second data packet sent by the client; and sending, by the server, the first data packet, for which the first TCP sequence number has been converted, to the client directly. A server, a gateway, and a computer-readable medium are also disclosed.
    Type: Grant
    Filed: September 12, 2018
    Date of Patent: November 24, 2020
    Assignee: BEIJING BAIDU NETCOM SCIENCE AND TECHNOLOGY CO., LTD.
    Inventors: Jian Zhang, Jiaoren Wu, Hao Jiang, Ning Liu, Yongxin Cui
  • Patent number: 10805997
    Abstract: Light output from an LED light source is increased or reduced in response to adjustment of a triac-based dimmer having a triac holding current to maintain conduction of the dimmer. An LED controller to control the light output includes a voltage-controlled impedance to provide an adaptive holding current that causes a triac current of the dimmer to be greater than the triac holding current, particularly when the dimmer is adjusted for significantly low light output (e.g., less than 5%, 2%, or 1% of full power light output). The adaptive holding current also allows for smooth increase of the light output starting from low light output, without perceivable flicker or shimmer. In one example, the voltage-controlled impedance is a resistive-like impedance that is placed on a secondary side of a transformer providing power to the LED light source. In another example, the voltage-controlled impedance is not pulse width modulated.
    Type: Grant
    Filed: April 6, 2020
    Date of Patent: October 13, 2020
    Assignee: DMF, Inc.
    Inventor: Jie Dong Wang
  • Patent number: 10727664
    Abstract: The present disclosure provides a temperature protection circuit for a power converter, including a plurality of temperature protection branches, each of the temperature protection branches comprises a resistor, a voltage source, a temperature switch, and an isolation transformer, and each of the temperature protection branches corresponds to one of the power semiconductor switch blocks, and a first end of the resistor of each of the temperature protection branches is coupled to an output electrode of the power semiconductor switch block, and a second end of the resistor is coupled to a first end of the voltage source and coupled to a first end of the contact of the temperature switch via a primary winding of the isolation transformer, a second end of the voltage source and a second end of the contact of the temperature switch are respectively coupled to the potential midpoint of the power converter.
    Type: Grant
    Filed: May 13, 2019
    Date of Patent: July 28, 2020
    Assignee: Delta Electronics, Inc.
    Inventors: Teng Liu, Yong Zeng, Jianping Ying, Ming Wang, Xiaobo Huang, Jun Liu
  • Patent number: 10706791
    Abstract: A backlight brightness control method and a backlight brightness control device are provided. The backlight brightness control method includes: acquiring a luminous brightness value of a display panel; determining a relationship between the luminous brightness value and a preset brightness value by a brightness control circuit; transmitting an adjusted current value to a backlight driver module according to the relationship by the brightness control circuit; and generating a current having the adjusted current value by the backlight driver module to drive a backlight module in the display panel to emit light.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: July 7, 2020
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Xinshe Yin, Masakazu Okamura
  • Patent number: 10652962
    Abstract: Various embodiments include apparatuses and methods enabling a dim-to-warm circuit operation of an LED multi-colored array. In one example, an apparatus includes a hybrid driving-circuit coupled to the LED array and to a single control-device to receive an indication of a luminous flux desired from the LED array. A color temperature for the LED array is determined based on the desired luminous flux of the LED array. In various embodiments, the hybrid driving-circuit includes an analog current-division circuit to produce current for at least two LED current-driving sources and a multiplexer array coupled between the analog current-division circuit and the LED to provide periodically, for a predetermined amount of time, current from at least one of the at least two LED current-driving sources to at least two colors of the LED array. Other apparatuses and methods are described.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: May 12, 2020
    Assignee: Lumileds LLC
    Inventor: Yifeng Qiu
  • Patent number: 10652965
    Abstract: An apparatus can include: a light-emitting diode (LED) drive circuit having a silicon-controlled rectifier dimmer; and a bus voltage adjustment circuit configured to adjust a direct current bus voltage to delay a turn-on time instant of the silicon-controlled rectifier dimmer when a conduction angle signal is greater than an angle threshold.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: May 12, 2020
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Jianxin Wang, Huiqiang Chen
  • Patent number: 10624172
    Abstract: A short protecting circuit for a LED (Light-emitting Diode) driver for powering a plurality of LED strings, having: a short comparing circuit, configured to provide a plurality of short fault indicating signals; a first logic circuit, configured to provide a short fault signal based on the plurality of short fault indicating signals to indicate a short fault condition; a timing circuit, configured to provide a short protecting enable signal; and a second logic circuit, configured to provide a plurality of short isolating signals; wherein the short isolating signals are blocked when an open fault signal is valid.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: April 14, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Bo Yu, Junxin Tan, Taofeng Li, Shufa Jiang, Li Yang
  • Patent number: 10602601
    Abstract: A creeping discharge element drive device of an embodiment includes a switching element, a current detector, a zero-cross detection circuit, a storage, and a controller. The current detector detects alternating currents flowing through the switching element. The zero-cross point detection circuit detects a zero-cross point of the alternating currents. The storage stores a first threshold value of a resonant period. The controller drives the switching element to apply a test voltage to the creeping discharge element, determines a resonant period of the alternating currents from the detected zero-cross points of the alternating currents, and restricts or stops the driving of the switching element in response to the resonant period exceeding the first threshold value.
    Type: Grant
    Filed: February 8, 2019
    Date of Patent: March 24, 2020
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Motofumi Tanaka, Toshiki Osako, Hiroki Murayama, Naoto Shinohara, Hiroyuki Yasui
  • Patent number: 10581320
    Abstract: A direct filtering type switching power supply is provided, for an occasion including pulsating direct current, including a filter circuit, a main power stage and an indicating circuit. A direct current input is connected to the filter circuit through the indicating circuit. The filter circuit and the main power stage are connected in parallel. The indicating circuit is formed by connecting a light emitting unit with an inductor in parallel, and make sure that the direction of the direct current input passing through the inductor is opposite to the conducting direction of the light emitting unit. The filter circuit at least includes an electrolytic capacitor. When the electrolytic capacitor is normal, an excitation current of a switching transistor in the main power stage basically does not appear in the inductor, and an LED in the light emitting unit does not emit light.
    Type: Grant
    Filed: August 24, 2016
    Date of Patent: March 3, 2020
    Assignee: MORNSUN GUANGZHOU SCIENCE & TECHNOLOGY CO., LTD.
    Inventor: Baojun Wang
  • Patent number: 10542612
    Abstract: A device (1) for providing an amount of power to a gas discharge lamp (2) comprises a control circuit (3) for controlling a supply circuit (4) for supplying the power according to a power versus voltage graph (10). A calculator (30) calculates a boundary voltage value as a function of a measured voltage value of a voltage signal that has been measured after a predefined time-interval from a cold start of the gas discharge lamp (2). A more accurate boundary voltage value results in more stability and in less time required to reach a steady state. The calculator (30) may be arranged for calculating the boundary voltage value as a function of a minimum voltage value of the voltage signal and of a steady state voltage value of the voltage signal. A memory (31) may store voltage values of the voltage signal and a processor (32) may update these voltage values.
    Type: Grant
    Filed: November 3, 2009
    Date of Patent: January 21, 2020
    Assignee: LUMILEDS LLC
    Inventors: Anatoli Saveliev, Sven Probst
  • Patent number: 10542597
    Abstract: A lighting control circuit (10) for controlling a plurality of LEDs (24, 26). The lighting control circuit (10) includes a current source (12) coupleable to a first LED (20) and a second LED (22); a first switch (24) configured to switch from an open position to a closed position when driven by a first drive signal (V3), wherein the first switch (24) is positioned to interrupt current flow (Iout) through the first LED (20) when the first switch (24) is in the open position; a second switch (26) configured to switch from an open position to a closed position when driven by a second drive signal (V4), the second drive signal (V4) being temporally non-overlapping with respect to the first drive signal (V3), wherein the second switch (26) is positioned to interrupt current flow (Iout) through the second LED (22) when the second switch (30) is in the open position.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: January 21, 2020
    Assignee: SIGNIFY HOLDING B.V.
    Inventor: Poh Ng
  • Patent number: 10440798
    Abstract: The present invention provides an LED lamp and a temperature control circuit applied to the LED lamp. The LED lamp includes at least one LED unit, a magnetic ballast, and an LED drive circuit. The magnetic ballast is coupled to a power and configured to limit and stabilize a received alternating current. The LED drive circuit includes a temperature control circuit. The temperature control circuit is coupled to the magnetic ballast and connected in parallel with the LED unit, is configured to detect an internal temperature of the LED lamp and adjust an output power of the LED unit, and includes a thermal sensitive module having a negative temperature coefficient thermistor and a phase cut circuit.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: October 8, 2019
    Assignee: CURRENT LIGHTING SOLUTIONS, LLC
    Inventors: Zhu Mao, Zhangji Zhou, Min Fang, Fanbin Wang, Shuyi Qin
  • Patent number: 10405392
    Abstract: A direct AC LED lighting device is provided with a controller that switches off a bleeder circuit following an initial rising edge for a post diode bridge voltage. The controller measures a first delay between a zero crossing for the post diode bridge voltage and the initial rising edge to estimate a triggering voltage for a leading edge dimmer switch. The controller determines a second delay following the initial rising edge responsive to the estimate of the triggering voltage. The controller may thus switch on the bleeder circuit at an expiration of the second delay so that bleeder circuit is only on for a duration sufficient to develop a voltage difference across the leading edge dimmer switch to equal the triggering voltage just as the post diode bridge voltage satisfies an LED threshold voltage.
    Type: Grant
    Filed: April 16, 2018
    Date of Patent: September 3, 2019
    Assignee: DIALOG SEMICONDUCTOR INC.
    Inventors: Nan Shi, Haiju Li
  • Patent number: 10390406
    Abstract: Light-emitting diode (LED) driver systems that are scalable and can be used for N-color LED systems are provided. An LED system having N LED strings of different color can be efficiently driven with independently controllable constant current sources for each string from a single power source. The driver system can include a power converter having an inductor.
    Type: Grant
    Filed: September 4, 2015
    Date of Patent: August 20, 2019
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Kumar Modepalli, Leila Parsa
  • Patent number: 10344733
    Abstract: There is provided an internal combustion engine ignition apparatus that can effectively raise the ignitability of an inflammable fuel-air mixture, by applying electric power corresponding to the combustion state of an internal combustion engine. A combustion state detection apparatus detects an combustion state inside a combustion chamber of the internal combustion engine; based on the combustion state detected by the combustion state detection apparatus in accordance with an operation state of an ignition coil apparatus, a current supply apparatus supplies an AC current to a spark discharge path formed in the gap of an ignition plug; then, a control apparatus controls the output of the current supply apparatus.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: July 9, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takeshi Koda, Ryo Sakaguchi
  • Patent number: 10342076
    Abstract: An illumination system includes a luminaire, a controller, and a switch that turns ON and OFF power supply to the luminaire. The controller includes: a light intensity controller that performs light intensity control of controlling the brightness of the luminaire; and a power supply controller that instructs the switch to turn OFF the power supply to the luminaire on which the light intensity control is performed at a light intensity rate that is equal to or greater than 0 and at most a predetermined value.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: July 2, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventor: Mototsugu Kawamata
  • Patent number: 10326377
    Abstract: A DC-to-AC inverter provides an AC voltage to the primary winding of an output isolation transformer having at least one secondary winding and having an auxiliary winding. The current supplied to a secondary load is reflected back into the primary winding as a reflected secondary current. A first feedback signal has a reflected secondary current component and has a primary magnetizing current component. An auxiliary winding voltage is applied to an inductor to generate an auxiliary current proportional to the primary winding magnetizing current. A second feedback signal is responsive to the auxiliary current. The second feedback signal is combined with the first feedback signal to produce a total feedback signal responsive only to the reflected secondary current. The DC-to-AC inverter responds to the total feedback signal and a reference signal to adjust the AC voltage to maintain the total feedback signal at a magnitude corresponding to the reference signal.
    Type: Grant
    Filed: July 30, 2018
    Date of Patent: June 18, 2019
    Assignee: Universal Lighting Technologies, Inc.
    Inventors: Wei Xiong, Travis L. Berry
  • Patent number: 10327301
    Abstract: In various embodiments, a circuit arrangement for operating light sources is provided. The circuit arrangement includes an input for inputting an input voltage, an output for outputting an output current, a first interface for controlling the circuit arrangement, and a second interface. The circuit arrangement is configured to set two different operating modes: in a first operating mode the circuit arrangement is configured to be controlled via the first interface and to receive information concerning the output current via the second interface and to correspondingly set the output current at the output, and in a second operating mode the circuit arrangement is configured to be controlled and to receive the information about the output current to be set at the output via the first interface, and to receive information from a sensor via the second interface and to process said information.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: June 18, 2019
    Assignee: OSRAM GMBH
    Inventors: Axel Pilz, Markus Heckmann
  • Patent number: 10306717
    Abstract: A flicker-free LED driving apparatus and voltage regulating method thereof are disclosed. The apparatus includes a power conversion circuit receiving an AC electricity and then generating an output voltage with a ripple component for an LED string; a feedback circuit electrically connected to the power conversion circuit and generating a feedback signal with varying duty cycle according to operation states of the LED string; a power conversion circuit including, a controller receiving the feedback signal turns on or off a switching device thereof according to the feedback signal; and a linear voltage-regulating circuit electrically connected to the power conversion circuit, the feedback circuit, and the LED string. and configured to regulate the output voltage in accordance with a voltage difference between the output voltage and a voltage across the LED string.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: May 28, 2019
    Assignee: ASIAN POWER DEVICES INC.
    Inventors: Yeu-Torng Yau, Tsung-Liang Hung
  • Patent number: 10292217
    Abstract: System and method for dimming control. The system includes a system controller, a transistor, and a resistor. The system controller includes a first controller terminal and a second controller terminal. The transistor includes a first transistor terminal, a second transistor terminal and a third transistor terminal. The resistor including a first resistor terminal and a second resistor terminal. The first transistor terminal is coupled, directly or indirectly, to the second controller terminal. The first resistor terminal is coupled to the second transistor terminal. The second resistor terminal is coupled to the third transistor terminal. The system controller is configured to receive an input signal at the first controller terminal and to generate an output signal at the second controller terminal. The transistor is configured to receive the output signal at the first transistor terminal and to change between a first condition and a second condition.
    Type: Grant
    Filed: December 7, 2016
    Date of Patent: May 14, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Liqiang Zhu, Jun Zhou, Lieyi Fang
  • Patent number: 10277134
    Abstract: A switching power supply device includes a first converter of boost type to which a full-wave rectified AC power supply is input, and a second converter of current resonant type to which an output of the first converter is supplied as an input voltage. The second converter has a normal mode for performing power supply control by continuously outputting an output of an oscillator to a switching element of the second converter and a standby mode for performing power supply control by intermittently outputting the output of the oscillator thereto under light load by comparing a feedback voltage from a secondary side of an isolation transformer with a threshold voltage. The second converter corrects the threshold voltage according to an output voltage of the first converter.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: April 30, 2019
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Koji Sonobe
  • Patent number: 10199935
    Abstract: Various examples are provided for hybrid boosting converters (HBCs). In one example, a HBC includes an inductive switching core and a bipolar voltage multiplier (BVM) coupled to the inductive switching core. In another example, a HBC micro-inverter includes an inductive switching core coupled to an input voltage; a BVM comprising a positive branch and a negative branch coupled to the inductive switching core; and a switched bridge coupled across the positive and negative branches of the BVM. In another example, a 3D HBC includes a common axis comprising a series of capacitors; and a plurality of parallel wings coupled to the common axis. The parallel wings form a BVM when coupled to the common axis and include an inductive switching core that is coupled to an input voltage. The common axis can include a single input voltage or multiple input voltages can be coupled through the wings.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: February 5, 2019
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Bin Wu, Keyue Smedley
  • Patent number: 10186977
    Abstract: An electric power conversion device includes: a transformer including first and second windings magnetically coupled; a bridge circuit including a switch element; a rectifier circuit coupled to an output side of the transformer; a first resonant inductor; a second resonant inductor external to the transformer; and a resonant capacitor, wherein n1?n2, Cr>C1, and Lr>L2 where Lr is an inductance value of the first resonant inductor and L2 is an inductance value including an inductance value of the second resonant inductor and an inductance value of a parasitic inductance component that is in series with the second winding in the pathway from the second winding to the rectifier circuit.
    Type: Grant
    Filed: May 17, 2018
    Date of Patent: January 22, 2019
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masahiro Yamaoka, Takehiko Yamakawa, Motohiko Fujimura
  • Patent number: 10141863
    Abstract: According to one embodiment, a controller determines the polarity of the input voltage detected by an input voltage detector. Then, when the polarity of the input voltage is positive, the first switch is subject to pulse driving, and when the polarity of the input voltage is negative, the second switch is subject to pulse driving, where the pulse driving is carried out at an on/off timing determined on the basis of the respective detection outputs of an input voltage detector, an input current detector, an output voltage detector, and an output current detector.
    Type: Grant
    Filed: January 25, 2016
    Date of Patent: November 27, 2018
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Yutaka Usami
  • Patent number: 10132284
    Abstract: An ignition device is provided for an idle stop & go system (ISG)-equipped vehicle using a liquefied petroleum gas (LPG) as a fuel. A separately installed auxiliary LPG switch detects the ON/OFF state of the LPG switch, drives fuel cut-off solenoid valves, and switches on/off together with the LPG switch. The ON/OFF state of the LPG switch can be determined based on an output voltage of the auxiliary LPG switch, and then ISG control can be implemented. After the fuel cut-off solenoid valves are driven, the fuel pipeline pressure remains in the state before the idle stop to improve the engine starting performance upon restarting. Also, in an emergency, the LPG and auxiliary LPG switches are simultaneously switched off, the fuel cut-off solenoid valves are quickly switched off and the fuel pump motor is stopped to quickly cut off the fuel supply and prevent a secondary accident in advance.
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: November 20, 2018
    Assignee: CONTINENTAL AUTOMOTIVE GMBH
    Inventor: Kim Mihnsung
  • Patent number: 10097045
    Abstract: An apparatus for wireless transmission of power from a DC voltage source to a DC voltage load, includes: one primary coil coupled with one secondary coil, the primary coil and the secondary coil each equipped with at least one capacitor, so that the primary coil resonates at a frequency that at least equal the secondary coil resonant frequency; the resonant coils are mutually moveable; a converter that converts the DC voltage at a primary side to an AC voltage of controllable magnitude and frequency; at least one rectifier at the secondary side converts the AC voltage at the terminals of the secondary coil to a DC voltage at the load on the secondary side; and a control system that regulates the power flow by changing the magnitude and frequency of the AC voltage at the terminals of the primary resonant coil.
    Type: Grant
    Filed: January 19, 2016
    Date of Patent: October 9, 2018
    Assignee: WARTSILA NORWAY AS
    Inventor: Giuseppe Guidi
  • Patent number: 10041984
    Abstract: A system for a linear isolated power supply circuit may include a boost converter having a boost inductor winding and an auxiliary side winding, the auxiliary side winding configured to be magnetically coupled to the boost inductor winding. The linear isolated power supply circuit includes a voltage sensing circuit coupled to the auxiliary side winding, the voltage sensing circuit configured to measure an input voltage at an isolated circuit associated with the auxiliary winding. The linear isolated power supply circuit includes a processor configured to receive the measured input voltage from the voltage sensing circuit and to cause at least one operation to be performed by the processor based at least in part upon the measured input voltage. Methods and apparatuses corresponding to the system are provided.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: August 7, 2018
    Assignee: Universal Lighting Technologies
    Inventors: Scott Price, Stephen D. Mays, II, John J. Dernovsek, II, Dane Sutherland, Keith Davis, Wei Xiong
  • Patent number: 10033281
    Abstract: Disclosed examples include integrated circuits configurable according to sensed circuit conditions to provide configurable power converter topologies with externally connected circuitry to implement buck, boost, buck-boost, low dropout and/or hot-swap power converters. The ICs include one or more sets of series connected high and low side transistors connected with corresponding IC pads to allow connection to external circuitry to form a particular power converter configuration. The IC includes a control circuit and a configuration circuit to sense a circuit condition of the IC and to configure the control circuit to provide switching control signals to the transistors to implement one of a plurality of power converter topologies.
    Type: Grant
    Filed: November 10, 2017
    Date of Patent: July 24, 2018
    Assignee: Texas Instruments Incorporated
    Inventors: Chuan Ni, Timothy P. Pauletti
  • Patent number: 10033373
    Abstract: To operate a load a half bridge includes a switching device with a high-side semiconductor switch and a low-side semiconductor switch. The semiconductor switches are connected in series via their current terminals, and each semiconductor switch may be assigned, via its control terminal, a driving system that switches the respective semiconductor switch on or off according to a drive signal. The load is connectable between the high-side and low-side semiconductor switches. The half bridge may include a load relief device connected to the switching device, e.g., in order to collect energy during a switching process in the switching device. The half bridge can\include an energy recovery circuit configured to feed the energy collected by the load relief device, e.g., a current, to an energy storage device before a further energy collection, e.g., current collection, of the load relief device, during a further switching process in the switching device.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: July 24, 2018
    Assignee: BECKHOFF AUTOMATION GMBH
    Inventor: Uwe Prüssmeier
  • Patent number: 10027377
    Abstract: A power transmitter coil, a power transmitter circuit, and a direct-current power source constitute a power transmitter unit. Further, a power receiver coil, a power receiver circuit, and a load constitute a power receiver unit. Further, a resonator coil and a resonator circuit constitute a resonator unit. In the power transmitter unit, electric energy of the direct-current power source is directly converted into electromagnetic energy, a resonant field is expanded by making resonance currents of the same frequency to flow in the power transmitter coil and the resonator coil, and in the power receiver unit, electromagnetic energy of the resonant field is directly converted into electric energy, thereby transmitting electric power from the power transmitter unit to the power receiver unit.
    Type: Grant
    Filed: July 28, 2015
    Date of Patent: July 17, 2018
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Tatsuya Hosotani
  • Patent number: 10015851
    Abstract: A ballast circuit suitable for driving an LED or similar load, comprises a primary switch mode converter, means for measuring a modulation, such as a phase cut, as used for dimming light levels, on an input AC supply, a current regulator positioned in series with the load, and a feedback controller for controlling operation of the switch mode controller based upon measured modulation levels. The feedback controller is adapted to interrupt normal switching of the switch mode converter if modulation levels detected lead to the ballast working at a lower than desired efficiency (deep dimming), or if voltage levels across the current regulator are higher than desired. The feedback controller may have a further feedback means for controlling switch mode parameters during lower levels of modulation (shallow dimming). The circuit allows large dimming levels to be achieved without generating appreciable light flicker in the load.
    Type: Grant
    Filed: July 27, 2015
    Date of Patent: July 3, 2018
    Assignee: Accuric Ltd.
    Inventor: David Charles Bannister
  • Patent number: 9986605
    Abstract: Systems and methods are provided for regulating a power conversion system. An example system controller includes: a detection component configured to receive an input voltage related to a diode connected to an inductor and output a first signal at a first logic level in response to the input voltage being larger than a predetermined threshold, a control logic component configured to receive the first signal, process information associated with the first signal, and output a modulation signal related to a modulation frequency in response to the first signal being at the first logic level, and a driving component configured to receive the modulation signal and output a drive signal to open and close a first switch at the modulation frequency.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: May 29, 2018
    Assignee: Guangzhou On-Bright Electronics Co., Ltd.
    Inventor: Lieyi Fang
  • Patent number: 9967935
    Abstract: The invention relates to a LED light source comprising: input terminals for connection to a mains voltage supply source, a rectifier coupled to the input terminals for rectifying the mains supply voltage supplied by the mains supply voltage source and comprising rectifier output terminals, a DC-DC converter for generating a DC current out of the rectified mains supply voltage, comprising converter input terminals connected to the rectifier output terminals and comprising a first converter output terminal and a second converter output terminal, a LED load with an anode coupled to the first converter output terminal via a first current control element for blocking a current flowing from the anode of the LED load to the first converter output terminal, and with a cathode coupled to the second converter output terminal via a first controllable switch having a control electrode coupled to first control circuitry for rendering the controllable switch non-conductive in case the LED light source is in standby mode
    Type: Grant
    Filed: May 23, 2016
    Date of Patent: May 8, 2018
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventors: Fokko Jan Willem Hulshof, Wilhelmus Josephus Cornelissen
  • Patent number: 9936552
    Abstract: In one example, a system includes a controller, a transformer including at least a primary winding and an auxiliary winding, a voltage supply, and a driver. The controller is configured to output an indication of a target current or a target power. The voltage supply is configured to receive an electrical current having a constant average current over time from the auxiliary winding and to output variable electrical current for supplying the controller. The voltage supply includes a capacitor for storing energy and a current sink for consuming a current. The driver is configured to selectively energize the primary winding for supplying one or more load devices based on the target current or the target power and selectively energize the primary winding for operating the voltage supply based on an indication of a voltage at the voltage supply.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: April 3, 2018
    Assignee: Infineon Technologies Austria AG
    Inventors: Tiam Poh Lau, Marcus Schaemann
  • Patent number: 9899911
    Abstract: A power source circuit includes first and second input terminals; first, second, and third inductors; first and second switching devices; first and second capacitors; and first and second output terminals. A first end of the second inductor is connected to a path that connects the first input terminal and the first node, a second end of the second capacitor is connected to a path that connects the second input terminal and the second node, and the first inductor and the second inductor are magnetically coupled with each other. A first end of the third inductor and a second end of the second inductor are connected to each other. A second end of the third inductor and a first end of the second capacitor are connected to each other.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: February 20, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Taiki Nishimoto, Akira Minegishi
  • Patent number: 9894727
    Abstract: A LED driver having at least one Integrated Circuit (IC), the IC programmable using a hardware description language; a first electronic switch operable to provide a first switching time period to control power factor voltage, the first switching time period programmable by the at least one IC; and a second electronic switch operable to provide a second switching time period to regulate ripple free constant DC electrical current flowing into the at least one LED, the second switching time period is programmable by the at least one IC.
    Type: Grant
    Filed: July 13, 2016
    Date of Patent: February 13, 2018
    Assignee: OPULENT ELECTRONICS INTERNATIONAL PTE LTD
    Inventors: Kai Fook Francis Wee, Chye Boon Tan, Hai Boon Tan, Andrea Stona, Soon Thiam Chan
  • Patent number: 9877367
    Abstract: An LED lamp comprises one or more LEDs and an LED driver receiving an input signal from a dimmer switch indicative of an amount of dimming for the LED lamp. The LED driver controls regulated current through the one or more LEDs based on the input signal such that an output light intensity of the one or more LEDs substantially corresponds to the amount of dimming for the LED lamp. A regulated output provides operating power for the LED driver. A controller regulates the regulated output to power the LED driver. The controller selects a power source for charging the regulated output from two or more power sources, and the regulated output is charged using the power source selected by the controller.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: January 23, 2018
    Assignee: Dialog Semiconductor Inc.
    Inventors: Chuanyang Wang, Chenglong Zhang, Nan Shi, Clarita C. Knoll, Guang Feng
  • Patent number: 9854630
    Abstract: A flicker-free dimming circuit for non-point light source has a TRIAC module, an input module, a conversion module and an output module. The TRIAC module adjusts the voltage phase of an external power supply for the input module to export an input voltage, and the conversion module in a boost circuit structure is provided with a conversion coil and a converter to receive and raise the voltage value of the input voltage to a voltage value of an operating voltage and then supplies the operating voltage to the output module. The output module adopts a fly-back circuit structure and induces the operating voltage to form a driving voltage in a constant value and then outputs the driving voltage to a lamp with a relatively wide light source area. In this way, the panel lamp can meet high safety standards and enhance its product adaptability and competiveness.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: December 26, 2017
    Assignee: Unity Opto Technology Co., Ltd.
    Inventors: Chih-Hsien Wu, Kai-Cheng Chuang, Cheng-Han Hung
  • Patent number: 9799263
    Abstract: The present invention provides a power supply circuit and an OLED display device, belongs to the field of OLED display technology, and can solve the problem that existing power supply circuits have low efficiency when brightness of the OLED display panel is low. The power supply circuit is used for proving an anode voltage and a cathode voltage for an OLED display panel, a difference between the anode voltage and the cathode voltage being a driving voltage, and the power supply circuit includes: a current detection unit for generating a control signal according to a driving current of the OLED display panel; and a driving voltage unit for generating, according to the control signal, a driving voltage positively correlated with the driving current, and including an anode voltage unit for generating an anode voltage and a cathode voltage unit for generating a cathode voltage.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: October 24, 2017
    Assignees: BOE TECHNOLOGY GROUP CO., LTD., ORDOS YUANSHENG OPTOELECTRONICS CO., LTD.
    Inventors: Chenggeng Zhang, Boya Zhang
  • Patent number: 9769418
    Abstract: Return loss due to excessive signal reflection into a cable television (CATV) network from an inoperative or abnormally operative terminal adapter is minimized, to communicate enhanced passive downstream signals to passive subscriber devices such as “life-line” telephone sets. A predetermined termination impedance is substituted for an active branch circuit of the terminal adapter whenever reduced input voltage, over-current or under-current conditions exist in the terminal adapter.
    Type: Grant
    Filed: May 3, 2016
    Date of Patent: September 19, 2017
    Assignee: PPC BROADBAND, INC.
    Inventor: Chad T. Wells
  • Patent number: 9748769
    Abstract: The present invention is directed towards a serially connected micro-inverter (SCMI) system comprising a plurality of power sources for producing DC power, a plurality of micro-inverters, where each micro-inverter is coupled to at least one power source of the plurality of power sources, for converting the DC power into AC power, an AC bus for coupling the plurality of micro-inverters in series to form a string and for coupling the AC power an AC line; and a controller, coupled to the string, for measuring an output signal of one or more strings of series coupled micro-inverters, comparing the measured output signal to a desired signal for the string; and adjusting a phase angle of an output from each micro-inverter in the one or more strings until a difference between the measured output signal and the desired signal is less than a predetermined threshold value.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: August 29, 2017
    Assignee: Enphase Energy, Inc.
    Inventor: Martin Fornage
  • Patent number: 9686834
    Abstract: An LED lamp comprises one or more LEDs and an LED driver receiving an input signal from a dimmer switch indicative of an amount of dimming for the LED lamp. The LED driver controls regulated current through the one or more LEDs based on the input signal such that an output light intensity of the one or more LEDs substantially corresponds to the amount of dimming for the LED lamp. A regulated output provides operating power for the LED driver. A controller regulates the regulated output to power the LED driver. The controller selects a power source for charging the regulated output from two or more power sources, and the regulated output is charged using the power source selected by the controller.
    Type: Grant
    Filed: September 15, 2014
    Date of Patent: June 20, 2017
    Assignee: Dialog Semiconductor Inc.
    Inventors: Chuanyang Wang, Chenglong Zhang, Nan Shi, Clarita Knoll, Guang Feng
  • Patent number: 9668309
    Abstract: An LED driver provides constant output power with wide range output current and voltage. A parallel resonant tank configuration is supplemented by resonant gain clamping circuit configured to partially cancel voltage across the resonant capacitor during half-bridge switching operation. Voltage between the resonant components is clamped to one-half a driver input voltage, ensuring inductive switching of the half-bridge. An output transformer has a primary winding coupled across the resonant capacitor, with a center tap defining first and second portions. An output voltage clamping circuit is coupled across the DC input power source and to the center tap, wherein maximum voltage across the primary is clamped based on a relationship between respective numbers of turns in the first and second portions, and maximum voltage across a secondary winding is clamped based on a relationship between the respective numbers of turns in the secondary winding and the first and second portions.
    Type: Grant
    Filed: August 30, 2016
    Date of Patent: May 30, 2017
    Assignee: Universal Lighting Technologies, Inc.
    Inventors: Wei Xiong, Danny Pugh, Candice Ungacta
  • Patent number: 9644800
    Abstract: A LED linear lamp that eliminates the cave effect by transmits the majority of its light downwardly in a main illumination direction and a lesser amount of light upwardly in a secondary illumination direction that is in a direction opposite to the main illumination direction. The LED linear lamps of the invention have one or more circuit boards with LEDs positioned thereon. These circuit boards with LEDs are positioned in a light transparent or translucent tube. Down lighting in the main illumination direction is provided by having some LEDs facing downwardly in the primary illumination direction, while up lighting is provided by having some LEDs facing upwardly or by provision of light transmission holes in the circuit board to permit some light leakage upwardly.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: May 9, 2017
    Assignee: ELB ELECTRONICS, INC.
    Inventor: Steven Purdy
  • Patent number: 9648690
    Abstract: A dimmable instant-start ballast for a plurality of LED lamps and/or a plurality of fluorescent lamps is provided, which includes an isolated dimming interface, a duty control device, a dimming switch, and an inverter circuit. The isolated dimming interface receives a dimming signal to generate a dimming voltage. The duty control device generates an operation signal according to the dimming voltage. The dimming switch periodically couples a first node to a ground according to the operation signal. The inverter circuit receives a rectified voltage and is coupled to the first node. When the first node is coupled to the ground terminal, the inverter circuit provides a lamp current for the LED lamps and/or the fluorescent lamps.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: May 9, 2017
    Assignee: Delta Electronics, Inc.
    Inventors: Ching-Ho Chou, Yung-Chuan Lu
  • Patent number: 9590493
    Abstract: An example apparatus may include a power supply circuit comprising a first stage, the first stage comprising a current-fed topology and a transformer for isolating a primary side of the first stage from a secondary side of the first stage; a control module configured to provide control signals to one or more switches of the power supply circuit and to perform startup operations comprising: determining a peak line voltage value of an AC input voltage to the power supply circuit; initiating, when the power supply circuit is started, a hard-switching method; determining a center tap voltage of the transformer; stopping the hard-switching method, when the center tap voltage crosses a fraction of the peak line voltage value; and initiating, when the hard-switching method stops, a zero-voltage switching method with peak current mode control.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: March 7, 2017
    Assignee: Bose Corporation
    Inventor: Manoel Soares
  • Patent number: 9572207
    Abstract: Representative implementations of devices and techniques provide a dimming arrangement for a variable load, such as a lamp. The dimming arrangement is coupled to a drive circuit for the load and arranged to reduce a drive current associated with the drive circuit, based on a control voltage.
    Type: Grant
    Filed: August 14, 2013
    Date of Patent: February 14, 2017
    Assignee: Infineon Technologies Austria AG
    Inventors: Tiam Poh Lau, Zhongfang Wang
  • Patent number: 9554432
    Abstract: System and method for dimming control. The system includes a system controller, a transistor, and a resistor. The system controller includes a first controller terminal and a second controller terminal. The transistor includes a first transistor terminal, a second transistor terminal and a third transistor terminal. The resistor including a first resistor terminal and a second resistor terminal. The first transistor terminal is coupled, directly or indirectly, to the second controller terminal. The first resistor terminal is coupled to the second transistor terminal. The second resistor terminal is coupled to the third transistor terminal. The system controller is configured to receive an input signal at the first controller terminal and to generate an output signal at the second controller terminal. The transistor is configured to receive the output signal at the first transistor terminal and to change between a first condition and a second condition.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: January 24, 2017
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Liqiang Zhu, Jun Zhou, Lieyi Fang
  • Patent number: 9554440
    Abstract: A dimmable LED lighting apparatus including a power input unit generating drive voltage through rectification of received AC power and outputting the generated drive voltage to the drive controller, an insulation type signal transceiver receiving a pulse width modulation (PWM) signal output from a PWM dimmer and outputting the PWM signal to the drive controller, while electrically insulating the PWM dimmer from the drive controller, a first LED group to an nth LED group, n being a positive integer of 2 or greater, receiving the drive voltage and sequentially operating under control of the drive controller, and a drive controller controlling sequential operation of the first LED group to the nth LED group according to a voltage level of the drive voltage, determining a dimming level based on the received PWM dimming signal, and controlling dimming of the first LED group to the nth LED group based on the determined dimming level.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: January 24, 2017
    Assignee: Seoul Semiconductor Co., Ltd.
    Inventor: Keon Young Lee
  • Patent number: 9547319
    Abstract: A lighting control device can include a control module and a processing module. The control module can provide a driving signal. The driving signal can modify a control voltage on a control interface. The control voltage can control a controllable ballast or driver. The processing module can determine a duty cycle of the driving signal. The control module and the processing module can receive power via the control interface and a power supply on the control device.
    Type: Grant
    Filed: May 14, 2015
    Date of Patent: January 17, 2017
    Assignee: ABL IP Holding LLC
    Inventors: Dalibor Zulim, Richard L. Westrick, Jr., Stephen Haight Lydecker