Having Digital Logic Patents (Class 363/21.13)
  • Patent number: 10291132
    Abstract: An integrated circuit may detect a pin voltage at a selector pin. The integrated circuit may compare the pin voltage to a threshold voltage. The integrated circuit may selectively perform primary side voltage regulation or secondary side voltage regulation, to regulate a voltage supplied to an electrical load coupled to the integrated circuit, based on comparing the pin voltage and the threshold voltage.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: May 14, 2019
    Assignee: Infineon Technologies Austria AG
    Inventors: Siu Kam Kok, Tuck Meng Chan, Yong Siang Teo
  • Patent number: 10270286
    Abstract: A light-emitting diode (LED) smart control circuit and the related LED lighting device are provided. The LED smart control circuit includes a microprocessor, a bridge rectifier, a transformer circuit, a power grid detection unit, a voltage detection unit, a battery charging controller, a first sampling circuit, a second sampling circuit, a constant current controller, and an external rechargeable battery. The LED smart control circuit is configured for controlling LED light source components to emit light. An LED lighting device includes the LED light source components, a smart control circuit board, a rechargeable battery, a shell, and a lamp head. The smart control circuit board is integrated with the disclosed LED smart control circuit.
    Type: Grant
    Filed: July 11, 2016
    Date of Patent: April 23, 2019
    Assignee: ZHEJIANG SHENGHUI LIGHTING CO., LTD
    Inventors: Yehua Wan, Lifeng Ling, Songan Ye
  • Patent number: 10243471
    Abstract: A controller includes a first power circuit, a second power circuit, and a charging control circuit. The first power circuit is coupled to a bypass terminal and a first terminal to be coupled to receive charge from a secondary winding. The first power circuit transfers charge from the first terminal to the bypass terminal. The second power circuit is coupled to the bypass terminal and a second terminal to be coupled to a receive charge from an output of a power converter. The second power circuit transfers charge from the second terminal to the bypass terminal. The charging control circuit controls which of the first and second power circuits transfers charge to the bypass terminal.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: March 26, 2019
    Assignee: Power Integrations, Inc.
    Inventors: Alex B. Djenguerian, Sheng Liu, Leif Lund
  • Patent number: 10236777
    Abstract: Magnetically isolated feedback circuits and regulated power supplies are disclosed. In some embodiments, a magnetically isolated feedback circuit includes an isolated gate drive circuit and a forward converter circuit. The isolated gate drive circuit is operable to receive a plurality of pulses, wherein the isolated gate drive circuit produces a plurality of isolated bi-polar pulses from the plurality of pulses. The forward converter circuit is electrically coupled to the isolated gate drive circuit and is operable to be electrically coupled to a load. The plurality of isolated bi-polar pulses causes the forward converter circuit to sample a voltage at the load as a sampled voltage. The forward converter circuit is operable to provide the sampled voltage to a feedback input of a pulse width modulator.
    Type: Grant
    Filed: January 22, 2018
    Date of Patent: March 19, 2019
    Assignee: L3 CINCINNATI ELECTRONICS CORPORATION
    Inventor: Justin Graves
  • Patent number: 10199918
    Abstract: In one embodiment, a controller for a power supply may be configured to operate as a quasi-resonant controller while operating in a discontinuous current mode and to operate as one of a pulse width or pulse frequency modulation controller while operating in a continuous current mode. The controller may have an embodiment that varies a frequency of the switching drive signal around a center frequency while operating in the continuous current mode, and varies a value of a current sense signal but not vary the frequency of the switching drive signal around a center frequency while operating in the discontinuous current mode.
    Type: Grant
    Filed: July 9, 2018
    Date of Patent: February 5, 2019
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Martin Podzemny, Vaclav Peroutka
  • Patent number: 10132849
    Abstract: A power and data communication system includes an inboard computer, an outboard computer, and first and second wires. The first and second wires connect a first isolation transformer of the inboard computer to a second isolation transformer of the outboard computer. The inboard computer drives a driven voltage through the first isolation transformer. The outboard computer is configured to receive the driven voltage through the second isolation transformer to power the outboard computer. The outboard computer incudes a load that is selectively connected across the second isolation transformer to transmit data to the inboard computer. The inboard computer receives the data through the first isolation transformer.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: November 20, 2018
    Assignee: Simmonds Precision Products, Inc.
    Inventor: Robbie W. Hall
  • Patent number: 10122284
    Abstract: System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes a first controller terminal and a second controller terminal. The system controller is configured to receive at least an input signal at the first controller terminal, and generate a gate drive signal at the second controller terminal based on at least information associated with the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power conversion system. The system controller is further configured to, if the input signal is larger than a first threshold, generate the gate drive signal at a first logic level to turn off the transistor.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: November 6, 2018
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventor: Lieyi Fang
  • Patent number: 10123382
    Abstract: A constant voltage and current synchronic output power supply and a television are disclosed. The constant voltage and current synchronic output power supply comprises a transformer for supplying power to LED loads, a conversion circuit for converting an inputted AC power supply to a DC square wave power supply that is provided to the transformer, a PWM control circuit for driving the transformer, a constant voltage control circuit and a constant current control circuit, the transformer comprises a constant voltage output winding and a constant current output winding, wherein the constant voltage control circuit is configured for sampling voltages outputted by the constant voltage output winding then transferring the sampled voltages into the corresponding signals that are feedbacked to the PWM control circuit, to perform constant voltage control on the output voltage of the transformer.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: November 6, 2018
    Inventors: Jitao Yang, Jianzhong Chen
  • Patent number: 10116236
    Abstract: An isolated switching mode power supply and a control method of the isolated switching mode power supply are provided. The isolated switching mode power supply includes a primary side circuit and a secondary side circuit. The primary side circuit includes a controller. The secondary side circuit is coupled to the primary side circuit and includes a winding, a switch, and an SR controller. The winding is coupled to the primary side circuit. The switch is coupled to the winding. The SR controller is coupled to the winding and the switch. The SR controller turns off the switch to trigger the winding to feed back a first message to the primary side circuit. The controller enables the primary side circuit to transfer energy to the secondary side circuit if the controller detects the first message.
    Type: Grant
    Filed: January 22, 2017
    Date of Patent: October 30, 2018
    Assignee: Sync Power Corp.
    Inventors: Hsian-Pei Yee, Ya-Wu Chung, Chun-Jen Huang
  • Patent number: 10097006
    Abstract: A control device includes a searching unit increasing or decreasing, at a predetermined step width, an operation voltage or an operation current of a power supply connected to a power converter to search a maximum power point of the power supply, a consecution time determining unit determining whether or not the searching unit has consecutively increased or decreased the operation voltage of the power supply or the operation current thereof, and a step width increasing unit increasing the step width upon determination by the consecution time determining unit that the increase or the decrease has been consecutively executed by a predetermined number of times.
    Type: Grant
    Filed: February 3, 2016
    Date of Patent: October 9, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koji Maki, Hiroshi Mochikawa, Shingo Yanagimoto
  • Patent number: 10090768
    Abstract: System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes a first controller terminal and a second controller terminal. The system controller is configured to receive at least an input signal at the first controller terminal, and generate a gate drive signal at the second controller terminal based on at least information associated with the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power conversion system. The system controller is further configured to, if the input signal is larger than a first threshold, generate the gate drive signal at a first logic level to turn off the transistor.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: October 2, 2018
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventor: Lieyi Fang
  • Patent number: 10038388
    Abstract: A converter and a driving method thereof are disclosed. The converter includes a transformer, a main switch, a clamp switch, and a switching controller. Here, the switching controller controls a turn-on time of the main switch and a turn-off time of the clamp switch corresponding to an output load.
    Type: Grant
    Filed: October 15, 2014
    Date of Patent: July 31, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Gwanbon Koo, Youngbae Park
  • Patent number: 10029109
    Abstract: Several defibrillators, defibrillator architectures, defibrillator components and methods of operating defibrillators are described. In one aspect, a defibrillator (as for example an automated external defibrillator) that can be powered by a mobile communication device such as a smart cellular phone or a tablet computer is described. Utilizing a phone (or other mobile communication device) as the power supply for an external defibrillator allows the external defibrillator to be smaller and, in some circumstance, removes the need for a battery that stores sufficient energy for shock delivery—which would need to be checked and/or replaced on a regular basis. Additionally, when desired, certain control functionality, computation, data processing, and user instructions can be handled/presented by the mobile communications device thereby further simplifying the defibrillator design and improving the user experience.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: July 24, 2018
    Assignee: Revive Solutions, Inc.
    Inventors: Rory M. Beyer, Charles Stonewall Montgomery
  • Patent number: 10014784
    Abstract: A method for modulating a voltage through a primary side regulating circuit and a secondary side regulating circuit, the method includes: providing a first controller in the primary side regulating circuit; providing a second controller in the secondary side regulating circuit; exchanging messages between the first controller and the second controller thereby alternately dominating a modulation of an output voltage between the primary side regulating circuit and the secondary side regulating circuit in accordance with the messages.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: July 3, 2018
    Assignee: Sync Power Corp.
    Inventors: Hsian-Pei Yee, Ya-Wu Chung, Chun-Jen Huang
  • Patent number: 10003248
    Abstract: In some examples, a method includes measuring, by a secondary controller, an output voltage and determining, by the secondary controller, a duration for a ringing time based on the output voltage. In some examples, the method further includes delivering, by the secondary controller, a non-enabling control signal to a secondary switch during the ringing time and measuring, by a primary controller, a duration of the ringing time. In some examples, the method also includes determining, by the primary controller, a duration for a charging time based on the duration of the ringing time and delivering, by the primary controller, an enabling control signal to a primary switch during the charging time.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: June 19, 2018
    Assignee: Infineon Technologies Austria AG
    Inventor: Andrey Malinin
  • Patent number: 9998012
    Abstract: In one embodiment, a voltage peak detection circuit can include: (i) a voltage coupling circuit configured to inductively couple an input inductor voltage of a switching power supply, and to generate a first voltage that represents a DC input voltage of the switching power supply; (ii) a voltage conversion circuit configured to receive the first voltage, and to generate a second voltage that is proportional to the first voltage; and (iii) a holding circuit configured to hold a peak of the second voltage to generate a peak voltage signal that represents peak information of the DC input voltage.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: June 12, 2018
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventor: Xiaoru Xu
  • Patent number: 9991809
    Abstract: The feedback IC is provided at the secondary side of the DC/DC converter and is coupled to the photo coupler. The error amplifier amplifies an error between a voltage detection signal according to an output voltage of the DC/DC converter and a target voltage, and draws a current according to the error from the input side of the feedback photo coupler via the photo coupler connection terminal. The abnormal detection circuit asserts an abnormal detection signal when an abnormal condition in a secondary side of the DC/DC converter is detected. The protection circuit is coupled to the photo coupler connection terminal, and acts on the feedback photo coupler via the photo coupler connection terminal so that a feedback operation by the error amplifier is invalid and an on-period of the switching transistor is shorten.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: June 5, 2018
    Assignee: ROHM CO., LTD
    Inventors: Hiroki Kikuchi, Ryo Shimizu
  • Patent number: 9979292
    Abstract: A control circuit for driving a power switch in a switching power supply can include: a start-up transistor having a drain coupled to a drain of the power switch, and a source coupled to a drain voltage detecting circuit; a gate voltage detecting circuit configured to detect a gate voltage of the power switch, to compare the gate voltage against a first threshold voltage, and to change an on drive current and an off drive current in response thereto; and the drain voltage detecting circuit being configured to detect a drain voltage of the power switch, to compare the drain voltage against a second threshold voltage, and to change the on drive current and the off drive current in response thereto.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: May 22, 2018
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Shaobin Zhang, Le Li, Zhiliang Hu, Yongjiang Bai
  • Patent number: 9966857
    Abstract: An AC-to-DC power converter with a BJT as a power switch can set a base current of the BJT by a current setting resistor which is in the outside of a control integrated circuit. Since an output current and a recovery current of the BJT are injected into a sensing resistor, the AC-to-DC power converter can correctly detect an inductor current thereof from the sensing resistor.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: May 8, 2018
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Jiun-Hung Pan, Chien-Fu Tang, Jyun-Che Ho, Isaac Y. Chen, Yu-Chang Chen, Jung-Pei Cheng
  • Patent number: 9948189
    Abstract: A power conversion device and a method for correcting decision threshold level thereof are disclosure. The method for correcting awaking-voltage of a power conversion device is provided. The method includes: fixing an output current of the power conversion module; monitoring a real decision threshold level of the power conversion module when the power conversion module departs from a burst mode; adjusting a preset decision threshold level based on the comparison between the real decision threshold level and the preset decision threshold level to make the preset voltage be equal to the real decision threshold level.
    Type: Grant
    Filed: May 23, 2016
    Date of Patent: April 17, 2018
    Assignee: CHICONY POWER TECHNOLOGY CO., LTD.
    Inventors: Ti-Te Chen, Chao-Yi Huang, Kuo-Cheng Chen
  • Patent number: 9893630
    Abstract: A power converter controller includes a drive circuit that generates a drive signal to switch a power switch to control a transfer of energy to an output of the power converter in response to a current sense signal, a feedback signal, and a current limit signal. A current limit generator generates the current limit signal in response to a load coupled to the output. An audible noise detection circuit generates a frequency skip signal in response to the drive signal to indicate when an intended frequency of the drive signal is within an audible noise frequency window. A state of the current limit signal fixed when the intended frequency of the drive signal is within the audible noise frequency window. A first latch generates a hold signal to control the current limit generator to hold the current limit signal in response to the frequency skip signal and the feedback signal.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: February 13, 2018
    Assignee: Power Integrations, Inc.
    Inventors: Vikram Balakrishnan, Giao Minh Pham, Ricardo Luis Janezic Pregitzer, Peter Vaughan
  • Patent number: 9876433
    Abstract: A controller for use in a power converter includes a drive circuit coupled to generate a drive signal to control switching of a power switch of the power converter in response to a feedback signal to control a transfer of energy from an input to an output of the power converter. An audible noise window circuit is coupled to generate a frequency skip signal in response to the feedback signal. The frequency skip signal is activated in response to a frequency of a feedback request signal responsive to the feedback signal being within an audible noise window. An audible noise reduction circuit is coupled to output a reduction signal in response to the frequency skip signal. The drive circuit is coupled to generate the drive signal in response to the reduction signal from the audible noise reduction circuit.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: January 23, 2018
    Assignee: Power Integrations, Inc.
    Inventors: Ricardo Luis Janezic Pregitzer, Peter Vaughan
  • Patent number: 9847728
    Abstract: Systems and methods are provided for power conversion system regulation. A system controller includes: a first signal processing component configured to receive a first signal associated with an auxiliary winding of a power conversion system and generate a second signal based at least in part on the first signal, the power conversion system further including a primary winding and a secondary winding; and a drive component configured to receive the second signal and output a drive signal to open or close a switch to affect a current flowing through the primary winding. The first signal processing component is further configured to: detect a plurality of valleys of the first signal, the plurality of valleys corresponding to a same demagnetization process of the power conversion system; select a valley from the plurality of valleys; and change the second signal at the selected valley.
    Type: Grant
    Filed: September 22, 2015
    Date of Patent: December 19, 2017
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Qian Fang, Huawei Lv, Yuan Lin, Lieyi Fang
  • Patent number: 9847726
    Abstract: A converter control system includes an analog-to-digital converter, a filter and a control module. The analog-to-digital converter digitalizes a different-time and a real-time feedback voltage. The filter bases on the different-time feedback voltage to sample a historical average feedback voltage. The control module receives the real-time feedback voltage, bases on the historical average feedback voltage to detect a load status of the converter, and bases on the real-time feedback voltage and the historical average feedback voltage to derive a voltage difference. The control module applies a control duty cycle to control the load switch. While the control module detects that the load status switches to a heavy-load status and the voltage difference reaches the threshold voltage, the control duty cycle is increased. While the control module detects that the load status switches to the light-load status and the voltage difference reaches the threshold voltage, the control duty cycle is decreased.
    Type: Grant
    Filed: September 16, 2016
    Date of Patent: December 19, 2017
    Assignee: Joint Power Exponent, Ltd.
    Inventor: Jyh-Ting Lai
  • Patent number: 9837909
    Abstract: A mode selection circuit generates a mode voltage according to a clamping current flowing when a voltage of a multi-pin is clamped to a predetermined clamping voltage, and selects one of a plurality of mode signals according to the mode voltage. The mode voltage is controlled according to a passive element connected to the multi-pin.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: December 5, 2017
    Assignee: FAIRCHILD KOREA SEMICONDUCTOR LTD.
    Inventors: Taesung Kim, Dong-Jin Park, Seung-Uk Yang
  • Patent number: 9825531
    Abstract: A power circuit is described that includes a transformer arranged to store energy. The power circuit further includes a parallel switch device arranged in parallel to a secondary side winding of the transformer, an output port coupled to a device and the secondary side winding of the transformer, and a control unit. The control unit is configured to receive, from the device, information indicative of a required voltage associated with the device, and control, based on the information, the parallel switch device to generate, based on an amount of energy stored at the transformer, the required voltage as an output voltage at the output port.
    Type: Grant
    Filed: July 10, 2013
    Date of Patent: November 21, 2017
    Assignee: Infineon Technologies Austria AG
    Inventors: Gerald Deboy, Anthony Sanders
  • Patent number: 9726698
    Abstract: A bidirectional voltage differentiator circuit comprises start-up circuitry, sensing circuitry, and output circuitry coupled to logic circuitry. The start-up circuitry acts to start-up the sensing circuitry when the circuit is powered on, and accelerates the response of the sensing circuitry thereafter. The sensing circuitry senses variation in an input voltage applied to an input node. Responsive to the voltage variation sensed by the sensing circuitry, the output circuitry produces a state change at a first or second output node. The logic circuitry receives the states of the output nodes and produces a logic output signal to indicate the occurrence of the variation sensed in the input voltage. The voltage sensing circuit is operable to sense variation of the input voltage regardless of whether the voltage is rising or falling and without regard to the DC value of the input voltage.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: August 8, 2017
    Assignee: STMicroelectronics (Shenzhen) R&D Co. Ltd
    Inventor: Yijun Duan
  • Patent number: 9699838
    Abstract: The present invention pertains to an inductor current detection circuit in a switching mode power supply, and a light-emitting diode (LED) driver thereof. In one embodiment, an inductor current detection circuit configured in a switching mode power supply under discontinuous conduction mode, can include: (i) a voltage detection circuit configured to generate a sampling voltage based on a drain-source voltage of a power switch in the switching mode power supply; (ii) a voltage holding circuit configured to receive the sampling voltage, and to generate a holding voltage through a sampling and holding operation; and (iii) a comparison circuit configured to compare the sampling voltage against the holding voltage, and to generate a zero-crossing signal when the sampling voltage is less than the holding voltage, where the zero-crossing signal is configured to represent an inductor current ending time of the switching mode power supply.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: July 4, 2017
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventor: Xiaoru Xu
  • Patent number: 9673692
    Abstract: A power source delivers power from a main power source using switching by a normally on transistor. A driver switches on and off the normally on transistor under a control signal by a controller during regular operation. A housekeeping power supply delivers auxiliary power to the driver. The driver switches off the normally on transistor during irregular operation. Irregular operation occurs at least when the control signal is absent or no auxiliary power is available or during transients such a power up or down. Bridge block pairs thereof can be arranged to form a half bridge power switch, an H bridge switch, a three phase bridge switch, a multi-phase switch, a buck converter, a buck-boost converter, or a boost converter.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: June 6, 2017
    Assignee: NXP USA, INC.
    Inventor: Josef C. Drobnik
  • Patent number: 9671711
    Abstract: An image forming apparatus includes: a plurality of image forming units forming an image in the corresponding color by electrophotographic system; a high-voltage power supply circuit capable of generating a bias voltage; and a control unit that controls a first printing mode and a second printing mode, wherein in the second printing mode, the control unit performs such control that the photosensitive bodies provided on the image forming units not used in the second printing mode continuously rotate at a speed lower than a speed in the first printing mode, and/or such control that a bias voltage whose absolute value is less than an absolute value of a bias voltage in the first printing mode is supplied from the high-voltage power supply circuit to the processing components of the same type provided on the image forming units not used in the second printing mode.
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: June 6, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Makoto Shimazoe, Akihiro Hayashi, Hiroyuki Yoshikawa, Toshikazu Higashi
  • Patent number: 9614449
    Abstract: The present invention provides a flyback power converter with a programmable output and a control circuit and a control method thereof. The flyback power converter converts an input voltage to a programmable output voltage according to a setting signal, wherein the programmable output voltage switches between different levels. The flyback power converter includes: a transformer circuit, a power switch circuit, a current sense circuit, an opto-coupler circuit, and a control circuit. The control circuit adaptively adjusts an operation signal according to a level of the programmable output voltage, to maintain a same or relatively higher operation frequency of the operation signal when the programmable output voltage switches to a relatively lower level, so as to maintain a phase margin while supplying the same output current.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: April 4, 2017
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuang-Fu Chang, Tzu-Chen Lin, Chien-Fu Tang
  • Patent number: 9585210
    Abstract: LED systems and circuits for generating a driver output for powering one or more LED devices are provided. A dimmable driver circuit can include a controller configured to reduce output ripple current to reduce flicker over the dimming range of the LED system. The dimmable driver circuit can receive a dimming control signal (e.g. a 0V to 10V dimming control signal) over an isolated dimming interface to reduce leakage current at the dimming interface. In addition, a dual-switch flyback converter circuit can be employed to increase efficiency of the driver circuit as well as to reduce electromagnetic interference (EMI) with the LED devices, such as EMI resulting from differential mode noise.
    Type: Grant
    Filed: April 30, 2015
    Date of Patent: February 28, 2017
    Assignee: Hubbell Incorporated
    Inventor: Michael Bandel
  • Patent number: 9577537
    Abstract: System and method for regulating an output voltage of a power conversion system. The system includes a sampling component located on a chip, which for example, receives an input voltage through a terminal. The sampling component, for example, samples the input voltage and generates a sampled voltage. Additionally, the system includes an error amplifier which for example, processes information associated with the sampled voltage and a threshold voltage and generates a first output signal, and a first signal generator which for example, generates a second output signal and one or more third output signals. Moreover, the system includes a comparator which for example, receives the first output signal and the second output signal and generates a comparison signal, and a gate driver directly or indirectly coupled to the comparator. The gate driver, for example, generates a drive signal based on at least information associated with the comparison signal.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: February 21, 2017
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Yunchao Zhang, Lieyi Fang
  • Patent number: 9553505
    Abstract: A circuit for electromagnetic interference (EMI) reduction contains a signal input, a signal output, a pulse count controlling unit, a stand-by power reduction unit, a pulse series delay unit, and a temperature sensing unit. An alternating current (AC) input is provided to the signal input and the modified signal is drawn out from the signal output. The pulse count controlling unit and the pulse series delay unit modify the pulses of the pulse-width modulation process such that the overall efficiency of the circuit is increased. In particular, the pulse count controlling unit increases the number of pulses per cycle such that additional power is transferred onto the output load. On the other hand, the pulse series delay unit shifts the start time of a series of pulses such that the overall emission is reduced. The stand-by power reduction unit disconnects power when a circuit overload occurs.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: January 24, 2017
    Assignee: CITA TECHNOLOGIES, LLC
    Inventors: Harrison Yuan, Hailong Tang, Charles Liang
  • Patent number: 9525352
    Abstract: The drive current of the switch in a switching power converter is adjusted dynamically according to line or load conditions within a switching cycle and/or over a plurality of switching cycles. The magnitude of the switch drive current can be dynamically adjusted within a switching cycle and/or over a plurality of switching cycles, in addition to the pulse widths or pulse frequencies of the switch drive current.
    Type: Grant
    Filed: June 18, 2013
    Date of Patent: December 20, 2016
    Assignee: Dialog Semiconductor Inc.
    Inventors: Junjie Zheng, Jun Zheng, Andrew Kwok-Cheung Lee, John William Kesterson, Allan Ming-Lun Lin, Hien Huu Bui, Carrie Seim, Yong Li
  • Patent number: 9488680
    Abstract: In one embodiment, a voltage peak detection circuit can include: (i) a voltage coupling circuit configured to inductively couple an input inductor voltage of a switching power supply, and to generate a first voltage that represents a DC input voltage of the switching power supply; (ii) a voltage conversion circuit configured to receive the first voltage, and to generate a second voltage that is proportional to the first voltage; and (iii) a holding circuit configured to hold a peak of the second voltage to generate a peak voltage signal that represents peak information of the DC input voltage.
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: November 8, 2016
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventor: Xiaoru Xu
  • Patent number: 9398653
    Abstract: The present invention discloses a LED driver including a power stage, an inductor, an error amplifier, a set comparator, a first timer, a logical AND circuit, a reset comparator, a second timer a logical OR circuit, a RS flip flop and a driving circuit. The LED driver provides sufficient latching current for the TRIAC dimmer with no large RC circuit, so as to optimize the dimming and reduce system size.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: July 19, 2016
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Naixing Kuang, Zilin Fan
  • Patent number: 9374009
    Abstract: Flyback converters are disclosed herein. An embodiment of a flyback converter includes a transformer having a primary side and a secondary side. A switch is connected to the primary side of the transformer, wherein the switch controls the current in the primary side of the transformer. A resistance is connected between the switch and a common node. The converter also includes a comparator having a first input and a second, the first input being connected between the switch and the resistor. Driver logic controls the state of the switch, wherein the output of the comparator is coupled to the driver logic. A voltage source is connected to the second input of the comparator. An error amplifier compares the voltage at the second input of the comparator to an adjustment voltage, the output of the error amplifier is coupled to the driver logic.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: June 21, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Rosario Stracquadaini
  • Patent number: 9369063
    Abstract: An output power adjusting method is applied on an inverter. The inverter includes a capacitor to store direct current (DC) electricity provided by a photovoltaic (PV) module. At least the DC electricity provided by the PV module is converted into alternating current (AC) electricity. Determine whether a power value of the AC electricity exceeds a power threshold. When the AC electricity exceeds the power threshold, the inverter works in a continuous mode. When the AC electricity does not exceed the power threshold, the inverter works in a discontinuous mode where the PV module charges the capacitor. In the discontinuous mode, determine whether a voltage on the capacitor exceeds a reference voltage, and when the voltage on the capacitor exceeds the reference voltage, the DC electricity provided by the PV module and DC electricity in pulses provided by the capacitor are converted to the AC electricity.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: June 14, 2016
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Po-Li Chen, Pao-Chuan Lin, Ming-Hung Yu
  • Patent number: 9331580
    Abstract: A switching power supply system includes a transformer having a primary winding, a secondary winding and a tertiary winding, a switching device inputted to the primary winding carrying out switching operation on the basis of a first control signal or a second control signal, an output voltage producing section rectifying and smoothing a voltage generated in the secondary winding to produce an output voltage, an output voltage detecting section producing an output voltage detection signal based on a voltage generated in the tertiary winding, a checking pulse generator generating pulses of the first control signal, and a switching controlling section producing the second control signal on the basis of the output voltage detection signal. The switching power supply system is capable of carrying out stable control of the output voltage on the secondary winding side of the transformer with a low power loss.
    Type: Grant
    Filed: July 12, 2013
    Date of Patent: May 3, 2016
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Masahiko Sakurai, Yukihiro Nishikawa
  • Patent number: 9326336
    Abstract: Driver circuits to reduce or remove flicker of SSL devices are presented. A controller for a power converter which converts electrical power at an input voltage into electrical power at an output voltage is described. The controller is configured to determine whether the input voltage is greater or smaller than a pre-determined voltage threshold; to operate a first switcher stage to transfer electrical power from the input of the power converter to the output of the power converter, during a first time period when the input voltage is greater than the pre-determined voltage threshold; and to operate a second switcher stage to transfer electrical power from the reservoir capacitor to the output of the power converter, during a second time period when the input voltage is smaller than the pre-determined voltage threshold.
    Type: Grant
    Filed: November 22, 2014
    Date of Patent: April 26, 2016
    Assignee: Dialog Semiconductor (UK) Limited
    Inventors: Horst Knoedgen, Julian Tyrrell
  • Patent number: 9318962
    Abstract: A switching mode power supply (SMPS) includes a transformer having a primary winding for coupling to an input power source, a secondary winding for providing an output voltage of the SMPS, and an auxiliary winding. The SMPS also has a power transistor coupled to the primary winding and a primary side control circuit coupled to the auxiliary winding and the power transistor. The primary side control circuit is configured to regulate the output of the SMPS by controlling the power switch in response to a feedback voltage signal that is representative of an output of the SMPS. The SMPs also has a secondary-side control circuit coupled to the secondary winding and being configured to cause the output voltage of the SMPS to discharge when the output voltage of the SMPS is higher than a first reference voltage.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: April 19, 2016
    Assignee: BCD Semiconductor Manufacturing Limited
    Inventors: Chao Gao, Pingan Zhao, Chao Chen
  • Patent number: 9318959
    Abstract: A controller circuit for the control of a power converter is disclosed. An example controller circuit generates a waveform that drives a switch that controls the power converter. The controller circuit includes a divider module that generates a modification factor based on a ratio of the two input signals of the module. The circuit includes a module that generates a first waveform configured for a critical conducting mode of operation of a power converter and an on-time adjuster module that modifies the first waveform based on the modification factor and generates a second waveform. The second waveform is delivered to the switch. An example modification factor is the ratio of the output voltage to the rectified input voltage of the power converter.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: April 19, 2016
    Assignee: Atmel Corporation
    Inventors: Hong Zhang, Sean S. Chen, Dilip Sangam
  • Patent number: 9287787
    Abstract: An example controller circuit includes a feedback sampling circuit, an oscillator, a drive logic, and a false sampling prevention circuit. The feedback sampling circuit generates a sample signal in response to a sampling of a feedback signal. The oscillator generates an on-time signal that transitions from a first logic state to a second logic state during each period of the on-time signal. The drive logic controls a switch to regulate the output of a power converter. The drive logic turns on the switch to end an off-time of the switch in response to the on-time signal transitioning from the first logic state to the second logic state. The false sampling prevention circuit prevents the on-time signal from transitioning from the first logic state to the second logic state to extend the off-time of the switch until a sampling complete signal indicates that sampling of the feedback signal is complete.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: March 15, 2016
    Assignee: Power Integrations, Inc.
    Inventors: Yury Gaknoki, David Kung, Michael Yue Zhang
  • Patent number: 9276485
    Abstract: A control circuit, a control method, and a power supply device are provided. The control circuit includes an obtaining module, adapted to obtain a voltage signal from a reverse surge current when the reverse surge current appears on a primary side of a switch power circuit of a synchronous rectification circuit; a maintaining module, adapted to continuously output a first control signal in a preset first time period when the voltage signal is greater than a preset first voltage threshold; and a control module, adapted to control and switch off switch tubes of the secondary side of the switch power circuit of the synchronous rectification circuit according to the first control signal. Thus, a reverse current surge of the switch power circuit of the synchronous rectification circuit can be effectively suppressed, and the safety of a switch power supply of the synchronous rectification circuit can be effectively protected.
    Type: Grant
    Filed: December 30, 2010
    Date of Patent: March 1, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Xiaodong Fan, Lei Feng, Fugao Zhao, Zhihua Liu
  • Patent number: 9257836
    Abstract: Common mode transient immunity for an isolation system is improved by using a common transient suppression circuit coupled to a receive circuit to suppress transients in signals received by the receive circuit that were transmitted from a transmit side of the isolation barrier using optical, magnetic, inductive, or other mechanisms.
    Type: Grant
    Filed: December 30, 2013
    Date of Patent: February 9, 2016
    Assignee: Silicon Laboratories Inc.
    Inventors: Michael J. Mills, Timothy J. Dupuis, Riad Wahby, Siddharth Sundar, Jeffrey L. Sonntag
  • Patent number: 9241381
    Abstract: A LED driving circuit, a control circuit and associated current sensing circuit. The control circuit has a sensing circuit, an estimation circuit, an amplifying circuit, a comparing circuit, a zero-cross detection circuit and a logic circuit. The sensing circuit is configured to sense a switching current flowing through at least one switch of a switching circuit to provide a first sensing signal. The estimation circuit is configured to process the first sensing signal to provide a feedback signal, wherein the feedback signal is indicative of a average current signal flowing through a LED. An average current flowing through the LED is regulated by sensing a switching current flowing through at least one switch.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: January 19, 2016
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Lin Feng, Yuedong Chen
  • Patent number: 9231483
    Abstract: A pulse modulator generates a pulse modulation signal SPM having a duty ratio which is adjusted according to a feedback voltage Vfb that corresponds to the output voltage VOUT of a DC/DC converter. A second oscillator generates a second cyclic signal which is asserted with each of a predetermined second period. A light load detection circuit generates a light load detection signal which is asserted when the feedback voltage Vfb becomes lower than a first threshold voltage. A driving circuit drives a switching transistor according to the pulse modulation signal SPM. Furthermore, the driving circuit suspends the driving of the switching transistor during a period until the second cyclic signal is next asserted after the light load detection signal is asserted.
    Type: Grant
    Filed: October 15, 2013
    Date of Patent: January 5, 2016
    Assignee: ROHM CO., LTD.
    Inventor: Satoru Nate
  • Patent number: 9203294
    Abstract: A switching power supply can reduce conduction noise when frequency spread control is conducted simultaneously with switching frequency reducing control. The switching power supply includes a frequency controller that controls the switching frequency of the switching element corresponding to a load condition and reduces the switching frequency in a light load period, a frequency spread modulator that modulates the switching frequency with a predetermined frequency spread width, and a frequency skipping controller that controls the frequency controller to skip a fundamental frequency of the switching frequency when the fundamental frequency becomes a predetermined threshold frequency.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: December 1, 2015
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Kenichi Nishijima
  • Patent number: 9197054
    Abstract: A circuit for controlling a latch mode of a pulse width modulation circuit includes a D flip-flop, a voltage generation unit, a comparator, and a logic unit. The D flip-flop generates a switch control signal according to a latch enable signal. The voltage generation unit generates a discharge current, and a voltage divider resistor group included in the voltage generation unit generates a first voltage when the voltage generation unit is turned on according to the switch control signal. A voltage of a predetermined pin of the pulse width modulation circuit is equal to a predetermined voltage when the discharge current is equal to the charge current. The comparator compares a reference voltage with the first voltage to generate a comparison signal. The logic unit generates a clear signal according to the comparison signal. The D flip-flop clears the switch control signal according to the clear signal.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: November 24, 2015
    Assignee: Leadtrend Technology Corp.
    Inventors: Ming-Chang Tsou, Fong-Cheng Yang, Shun-Chin Chou