Utilizing Pulse-width Modulation Patents (Class 363/21.18)
  • Patent number: 11018591
    Abstract: Disclosed is a dynamic regulation power controller having a work voltage input pin, a feedback voltage input pin, a driving voltage output pin, a current sensing input pin, and a regulation power input pin, and being in collocation with a switching unit, an input power processing unit, a transformer, a current sensing resistor, a power regulation unit, an output rectification unit, and an output capacitor for converting an input AC voltage into an output voltage for supplying a load. In particular, the driving voltage and the driving current are dynamically adjusted according to the feedback voltage and the current sensing signal, thereby greatly increasing efficiency of power conversion and Electromagnetic Interference (EMI).
    Type: Grant
    Filed: January 22, 2020
    Date of Patent: May 25, 2021
    Assignee: INNO-TECH CO., LTD.
    Inventors: Chih-Feng Lin, Shu-Chia Lin, Tsu-Huai Chan
  • Patent number: 10826403
    Abstract: A system includes an input voltage supply and a switching converter coupled to the input voltage supply. The switching converter includes a transformer having a primary coil and a secondary coil. The switching converter also includes a Y-rated capacitor with a top plate and a bottom plate, wherein the top plate is coupled to a first end of the secondary coil. The switching converter also includes a push-pull current source coupled to the bottom plate of the Y-rated capacitor. The switching converter also includes a controller coupled to the push-pull current source.
    Type: Grant
    Filed: September 10, 2019
    Date of Patent: November 3, 2020
    Assignee: Texas Instruments Incorporated
    Inventors: Yogesh Kumar Ramadass, Ashish Kumar
  • Patent number: 10686386
    Abstract: A resonant or semi-resonant DC/DC converter makes use of one or more synchronous rectification (SR) switches for rectifying an output current that is provided to a load of the converter. The SR switches are ideally turned off when zero current is flowing through them. To achieve such zero-current switching, the current through each of the SR switches is monitored and compared against a turn-off threshold. The turn-off threshold for a particular SR switch is determined from the slope of a waveform of the current together with a transition delay for turning off the SR switch. This transition delay typically includes a delay through a driver circuit for the SR switch together with a latency through the SR switch itself. Once it is detected that the current for an SR switch has dropped to or below the turn-off threshold, a signal is provided to the SR switch turning it off.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: June 16, 2020
    Assignee: Infineon Technologies Austria AG
    Inventors: Darryl Tschirhart, Amir Babazadeh
  • Patent number: 10622904
    Abstract: The disclosure is directed to techniques to determine the output voltage on the secondary side of a power converter. These techniques maintain isolation between the primary and secondary by measuring a voltage on the primary side with a single sample event synchronized to a power cycle of the power converter. A measuring circuit may determine a drain voltage of a primary side switch that controls current to the primary side coil. The measuring circuit may sample the drain voltage at a predetermined delay time from a trigger pulse based on a control signal to the primary side switch. The output voltage may be calculated based on the sampled drain voltage and other characteristics of the flyback converter circuit, such as transformer turns ratio, primary side input voltage and other characteristics. The output voltage calculation does not require auxiliary windings or isolation components, such as an opto-coupler.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: April 14, 2020
    Assignee: Infineon Technologies AG
    Inventors: Andrea Menegolo, Philipp Brandtner
  • Patent number: 10505461
    Abstract: A flyback power converter circuit includes a transformer, a power switch, a primary side controller circuit, and a secondary side controller circuit. The transformer converts an input voltage to a first, a second and a third output voltages. The primary side controller circuit and the secondary side control are powered by the second voltage and a third voltage, respectively. In a burst mode, when the second output voltage is lower than a first threshold, a power regulation mode is triggered to control the power switch, such that the second output voltage is between the first threshold and a second threshold. After a predetermined delay time period, the power regulation mode stops and the flyback power converter circuit enters a reboot procedure, wherein the power switch is OFF such that the third voltage is lower than a secondary side reboot threshold, whereby the secondary side controller circuit is reboot.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: December 10, 2019
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuang-Fu Chang, Chien-Hung Chen
  • Patent number: 10277135
    Abstract: A dual-output flyback voltage conversion circuit and a display device are provided. The dual-output flyback voltage conversion circuit includes an input module, a voltage transformation module, an output module, and a feedback module. The input module is used for rectifying and filtering an input voltage. The voltage transformation module is used for performing a voltage conversion process on the input voltage which is obtained after rectifying and filtering. The output module is used for outputting a first output voltage and a second output voltage according to conversion voltages. The feedback module is used for controlling the voltage transformation module to output the input voltage which is obtained after rectifying and filtering according to the first output voltage and the second output voltage.
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: April 30, 2019
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventor: Wendong Li
  • Patent number: 10177667
    Abstract: An exemplary embodiment of an alternating valley switching controller is provided. The alternating valley switching controller includes a valley detection circuit and an alternating circuit. The valley detection circuit is coupled to an auxiliary winding of a transformer to generate a valley-detection signal. The alternating circuit alternates a plurality of switching periods of a switching signal according to a blanking-window signal and the valley-detection signal. The blanking-window signal switches between a first voltage level and a second voltage level in the plurality of switching periods. The plurality of switching periods includes at least two first periods and at least two second periods which occur alternately in response to the first voltage level and the second voltage of the blanking-window signal.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: January 8, 2019
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Chien-Tsun Hsu, Hang-Seok Choi, Chih-Hsien Hsieh
  • Patent number: 10044254
    Abstract: Systems and methods are provided for regulating a power conversion system. An example system controller includes a first controller terminal and a second controller terminal. The first controller terminal is configured to receive a first signal associated with an input signal for a primary winding of a power conversation system. The second controller terminal is configured to output a drive signal to a switch to affect a first current flowing through the primary winding of the power conversion system, the drive signal being associated with an on-time period, the switch being closed during the on-time period. The system controller is configured to adjust a duration of the on-time period based on at least information associated with the first signal.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: August 7, 2018
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Xiangkun Zhai, Yunchao Zhang, Jun Zhou, Lieyi Fang
  • Patent number: 9991812
    Abstract: A power supply includes a transistor that is connected to a primary winding of a transformer. A controller controls a switching operation of the transistor by quasi-resonant switching. The controller receives a feedback voltage and adjusts the feedback voltage to adjust a blanking frequency, which is an inverse of a blanking time during which the transistor is prevented from being turned on. The controller turns on the transistor after expiration of the blanking time based on a level of a resonant ring.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: June 5, 2018
    Assignee: Semiconductor Components Industries, LLC
    Inventors: Bonggeun Chung, Taesung Kim, Gwanbon Koo
  • Patent number: 9991787
    Abstract: A control circuit for a switch mode power supply (SMPS) includes a power switch for coupling to a primary winding of the power supply and a startup resistor coupled to an external input voltage and to a control terminal of the power switch. The control circuit also includes a controller. During startup, the controller is configured to cause the power switch to amplify a startup current from an external input voltage through the startup resistor and provide a startup power to the controller. During normal operation, the controller is configured to provide a power switch control signal to turn on and off the power switch for controlling a current flow in the primary winding and regulating an output of the power supply. The controller is configured to provide a current signal for driving an NPN power switch and to provide a voltage signal for driving an NMOS power switch.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: June 5, 2018
    Assignee: SHANGHAI SIM-BCD SEMICONDUCTOR MANUFACTURING CO., Ltd.
    Inventors: Meiling Zhang, Xiaoru Gao, Chao Chen, Yajiang Zhu
  • Patent number: 9966831
    Abstract: The present disclosure relates to a controller and a controlling method of a switching power supply. The controller of the switching power supply is used for turning on and off a power transistor so that inductor current flows through an inductor which is connected in series with the power transistor. The controller includes a frequency-jittering signal generating circuit, a superimpose circuit and a first comparator. The frequency-jittering signal generating circuit generates a frequency-jittering signal variable over time. The superimpose circuit superimposes the frequency-jittering signal on a sampling signal of the inductor current to generate a superimposed signal. The first comparator compares the superimposed signal with a control voltage to generate an OFF signal for turning off the power transistor. The controller of the switching power supply reduces conducted electromagnetic interference by a frequency-jittering control on the sampling signal of the inductor current.
    Type: Grant
    Filed: November 30, 2015
    Date of Patent: May 8, 2018
    Assignee: SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) LTD.
    Inventors: Dan Zhang, Zhiliang Hu, Qiukai Huang, Yongjiang Bai, Le Li
  • Patent number: 9929663
    Abstract: Techniques are provided for controlling power switches that couple an input power source to a transformer within a voltage converter, in order to control the power transfer through the transformer and to a load of the voltage converter. Different techniques are provided for different operational modes. In an initial steady-state interval, the switches are switched using a fixed first switching period and variable duty cycle. Upon detecting a load transient, e.g., a sudden increase in the load power requirements, a ramp-up interval is entered during which the switches are switched using a second switching period and a second duty cycle, in order to increase the output current of the converter at a maximum rate. Upon detecting that a current within the voltage converter has reached a maximum allowed level, a current-limited interval is entered during which the switches are switched using a third switching period and a third duty cycle.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: March 27, 2018
    Assignee: Infineon Technologies Austria AG
    Inventors: Amir Babazadeh, Darryl Tschirhart
  • Patent number: 9912234
    Abstract: Systems and methods for mitigation of resistor nonlinearity errors in a power converter are provided. In at least one embodiment, the power converter comprises at least one power switch coupled to an input voltage, a pulse width modulation (PWM) circuit for generating control pulses for the at least one power switch, at least one output inductor coupled to a respective one of the at least one power switches, a current sensor coupled in parallel with the at least one output inductor, and at least one circuit element. The current sensor comprises at least one capacitor, at least one resistor for each of the at least one output inductors, and is coupled to the PWM circuit at a current bleed node. The at least one circuit element is coupled to the current bleed node and bleeds a bleed current from the current bleed node when a power switch is turned on.
    Type: Grant
    Filed: August 7, 2014
    Date of Patent: March 6, 2018
    Assignee: INTERSIL AMERICAS LLC
    Inventors: Warren Richard Schroeder, Thomas Andrew Jochum
  • Patent number: 9748834
    Abstract: A control circuit for a switch mode power supply (SMPS) includes a power switch for coupling to a primary winding of the power supply and a startup resistor coupled to an external input voltage and to a control terminal of the power switch. The control circuit also includes a controller. During startup, the controller is configured to cause the power switch to amplify a startup current from an external input voltage through the startup resistor and provide a startup power to the controller. During normal operation, the controller is configured to provide a power switch control signal to turn on and off the power switch for controlling a current flow in the primary winding and regulating an output of the power supply. The controller is configured to provide a current signal for driving an NPN power switch and to provide a voltage signal for driving an NMOS power switch.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: August 29, 2017
    Assignee: Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
    Inventors: Meiling Zhang, Xiaoru Gao, Chao Chen, Yajiang Zhu
  • Patent number: 9673727
    Abstract: A jitter control circuit, which reduces conducted EMI noise by giving jitter (frequency diffusion) to the operating frequency for driving a switching element, determines an operating frequency fc (e.g., 40 kHz) at which reduction effects change from a feedback voltage that represents magnitude of a load. The jitter control circuit causes a, for example, 8-bit counter that generates a modulation frequency to operate with, for example, 8 bits when 40 kHz?fc and 7 bits when fc<40 kHz. In this way, even when the range of the EMI noise measurement frequency is extended to the lower frequency side, for example, to 25 kHz, the maximum reduction effect is maintained in the entire frequency range. Thus, the maximum EMI noise reduction effect is obtained.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: June 6, 2017
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Kenichi Nishijima
  • Patent number: 9647561
    Abstract: A control circuit of a power supply is provided. The control circuit includes a circuit and a PWM circuit. The circuit generates a limit signal in response to an output voltage of the power supply for limiting a switching current of a transformer of the power supply. The PWM circuit generates a switching signal in response to a feedback signal and the limit signal for switching the transformer and regulating the output voltage of the power supply. A level of the feedback signal is related to a level of the output voltage of the power supply. The output voltage of the power supply is programmable.
    Type: Grant
    Filed: October 9, 2014
    Date of Patent: May 9, 2017
    Assignee: FAIRCHILD (TAIWAN) CORPORATION
    Inventors: Ta-Yung Yang, Chen-Hua Chiu, Chien-Yuan Lin, Jung-Sheng Chen, Yuan-Pu Lee
  • Patent number: 9614448
    Abstract: A switching power-supply device, in which an input power is applied to a primary winding of a transformer, a pulse voltage is induced in a secondary winding of the transformer by turning on and off a switching element connected to the primary winding of the transformer and an output voltage rectified and smoothed by a secondary-side rectifying-and-smoothing circuit having a rectifier diode and a smoothing capacitor is outputted. The switching power-supply device includes: a transient state detection circuit, which detects a transient state and outputs a soft-drive instruction signal; and a drive circuit which turns on-and-off the switching element in a soft-drive operation, in which a charging speed of a gate voltage at a time of passing a gate threshold voltage is delayed as compared to a normal operation, in a case where the soft-drive instruction signal is inputted.
    Type: Grant
    Filed: February 25, 2015
    Date of Patent: April 4, 2017
    Assignee: Sanken Electric Co., LTD.
    Inventors: Akira Hayakawa, Masaaki Shimada, Yoichi Terasawa
  • Patent number: 9608525
    Abstract: A selected-parameter adaptively switched power conversion system, for example, includes a counter for determining a period of an output oscillation a power supply switch, where the output oscillation starts when an output current generated by stored power of the power supply coil decays substantially to zero. An event generator for generating a switching delay event in response to the determined output oscillation period and generates a switching delay event in response to a determination of a phase of the output oscillation.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: March 28, 2017
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Subrahmanya Bharathi Akondy, Hrishikesh Nene
  • Patent number: 9590615
    Abstract: An integrated circuit includes: an inductor; a switching element connected to the inductor in series; an oscillator, of which an oscillation frequency is variable; a control unit, which controls the oscillation frequency of the oscillator based on a signal according to an output voltage of a switching power-supply device; a drive signal generating unit, which generates a drive signal used for controlling the switching element based on an output of the oscillator; a drive circuit, which drives the switching element based on the drive signal generated by the drive signal generating unit; and an on-period intermittent control unit, which intermittently performs on-period extension control in which an on-period of the switching element is set to be longer than an on-period based on the drive signal in a state where the oscillation frequency is controlled not to be fixed by the control unit.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: March 7, 2017
    Assignee: Sanken Electric Co., LTD.
    Inventors: Akira Hayakawa, Yoshimichi Tadamasa
  • Patent number: 9496703
    Abstract: A leakage current detection circuit includes a driving voltage detection unit that detects a cut-off point of a driving voltage regulated through a driving voltage switch, a leakage current detection unit that detects a leakage current of the driving voltage switch after cutting off of the driving voltage, generates a leakage detection signal when a driving voltage related to the leakage current exceeds a reference detection voltage and a driving voltage control unit that turns off the driving voltage switch at a cut-off point of the driving voltage to cut off the driving voltage and maintain the driving voltage switch in an off state when the leakage detection signal is received. The leakage current detection circuit detects a leakage current passing through the driving voltage switch when abnormal operation of a light emitting diode light apparatus occurs, and keeps the driving voltage switch in an off state during cutoff periods to prevent burning of the drive voltage switch.
    Type: Grant
    Filed: March 11, 2016
    Date of Patent: November 15, 2016
    Assignee: MagnaChip Semiconductor, Ltd.
    Inventors: Doo Soo Shin, Su Wan Park, Young Gi Ryu, Young Lok Shin
  • Patent number: 9431913
    Abstract: A voltage detecting circuit used with a switching converter. The switching converter having an energy storage component, a first power switch and a second switch. The voltage detecting circuit has a sample and hold circuit configured to sample and hold the voltage at the connection node of the energy storage component and the first power switch when the first power switch is OFF and the second power switch is ON; and an average circuit configured to average the sampled voltage during a switching period to generate a detecting signal in proportional to the output voltage of the switching converter.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: August 30, 2016
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Naixing Kuang
  • Patent number: 9413256
    Abstract: An object is to suppress deterioration of a high-voltage side battery regardless of the magnitude of a load current. Provided is a control device of a DC-DC converter that is constituted by a primary side circuit that is electrically connected between an input side and a transformer, and a secondary side circuit that is electrically connected between an output side and the transformer. The control device includes a command generating unit 325 that sets an output current limiting value to a predetermined value on the basis of a detected input voltage, a duty generating unit 330 that calculates a duty configured to turn ON/OFF a switching element on the basis of the output current limiting value and a detected output current, and a switching signal generating unit 335 that generates a switching signal on the basis of the duty. The duty generating unit 330 generates the duty so that an output current is limited to the output current limiting value or less.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: August 9, 2016
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Hiroshi Tamura, Kenji Kubo, Takuma Ono, Susumu Sato, Satoshi Idei
  • Patent number: 9413222
    Abstract: In one embodiment, an undervoltage protection circuit for a switching power supply can include: (i) an undervoltage detection circuit that determines whether an input voltage of the switching power supply is in an undervoltage state; (ii) a selection circuit configured to select a first or a second control signal to be provided as a main control signal to a control circuit; (iii) the control circuit being configured, in response to the main control signal being the first control signal, to control a switching operation of a power transistor in the switching power supply such that an output voltage of the switching power supply is maintained as substantially stable; and (iv) the control circuit being configured, in response to the main control signal being the second control signal, to control the switching operation of the power transistor to reduce an input power of the switching power supply.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: August 9, 2016
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Xiaoru Xu, Yunlong Han
  • Patent number: 9397575
    Abstract: In a switching power supply device, a voltage of a counter electromotive force induced in a drive winding as a high side switching element is turned off is output to a ZT terminal of a switching control IC, and thus an OUT terminal of the switching control IC is brought to a high level, and thus a low side switching element is turned on. A constant current circuit charges a capacitor with a constant current through a voltage at the OUT terminal. A comparator in the switching control IC inverts the voltage at the OUT terminal to a low level upon a voltage at an IS terminal exceeding a voltage at an FB terminal. Thus, an on time of the low side switching element is controlled in accordance with a voltage output to the FB terminal, and an output voltage Vo is turned into a constant voltage.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: July 19, 2016
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Tatsuya Hosotani
  • Patent number: 9379635
    Abstract: A detection circuit for converting a control signal while maintaining electrical isolation between a first ground and a second ground. The detection circuit includes a first input configured to receive the control signal; a gate signal input configured to receive a gate signal; a transformer; an isolator; a rectifier; and an output electrically connected to the rectifier, the output configured to output the converted control signal. The transformer is configured to receive the control signal from the first input, transform the control signal into a transformed control signal, and output the transformed control signal. The isolator is configured to receive the gate signal from the gate signal input, and control the transformer in response to the gate signal. The rectifier is configured to receive the transformed control signal from the transformer, and convert the transformed control signal to a converted control signal.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: June 28, 2016
    Assignee: Regal Beloit America, Inc.
    Inventor: Vijay K. Earanky
  • Patent number: 9356522
    Abstract: The present invention discloses a power supply circuit for driving an LED lamp and a power supply method. The power supply circuit is constituted by an AC-DC converter by adopting DCM-DCM. Also, the power supply circuit adopts a valley fill circuit to reduce rippling of output current and adopts the DCM-DCM to stabilize a link voltage, thereby realizing a power factor correction circuit having two-stage structures. Thus, an input voltage of the flyback converter may be improved, and a high reverse voltage may be applied.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: May 31, 2016
    Assignee: SILICON WORKS CO., LTD.
    Inventors: Ju Pyo Hong, Jun Ho Kim
  • Patent number: 9343984
    Abstract: A controller of a power converter with adjustable jitter amplitude includes a feedback pin, a logic circuit, an auxiliary pin, and a current sensing pin. The feedback pin is used for receiving a feedback voltage from a secondary side of the power converter. The feedback voltage corresponds to an output voltage of the secondary side of the power converter. The logic circuit is used for generating a jitter signal according to a clock, the feedback voltage, and a first resistor. The auxiliary pin is used for receiving a voltage corresponding to an auxiliary winding of the power converter. The current sensing pin is used for generating a detection voltage according to a current flowing through a primary side of the power converter. The voltage, the jitter signal, and the detection voltage determine turning-on time of the primary side of the power converter.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: May 17, 2016
    Assignee: Leadtrend Technology Corp.
    Inventors: Ming-Chang Tsou, Jiun-Sheng Huang, Kuo-Chien Huang, Ren-Yi Chen
  • Patent number: 9306460
    Abstract: A power supply device including a switch arrangement including switches for generating a square wave output, a switch control arrangement for controlling the switch arrangement, a resonator tank, a rectifier circuitry for rectifying in an output from the tank, and a burst mode operation arrangement configured to facilitate a standby mode of the power supply and including a burst mode restriction arrangement for receiving and evaluating a first feedback parameter associated with a switch of the switch arrangement, the burst mode operation arrangement further receiving and evaluating a second feedback parameter indicative of the output voltage of the power supply device, and being configured to disable and enable the burst mode feature based on the evaluation of both the first feedback parameter and second feedback parameter by controlling an output from the burst mode operation arrangement.
    Type: Grant
    Filed: February 20, 2012
    Date of Patent: April 5, 2016
    Assignee: VKR HOLDING A/S
    Inventor: Alex Sørensen
  • Patent number: 9285812
    Abstract: A regulator control circuit includes a switch control signal generator to generate a switch control signal and a soft start circuit to generate a soft start signal for use by the switch control signal generator. The soft start circuit includes a soft start controller and a decreasing circuit to decrease the soft start signal in response to the soft start controller. The soft start controller may comprise a non-regulation detector to detect a non-regulation condition. Embodiments include decreasing the soft start signal in response to a non-regulation condition lasting a predetermined time, detecting the non-regulation condition in response to a maximum duty cycle of the regulator switch, generating a soft start level indicator to control decreasing the soft start signal, and maintaining the soft start signal at a predetermined relationship with respect to a feedback signal.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: March 15, 2016
    Assignee: Allegro Microsystems, LLC
    Inventors: Joshua Wibben, Robert Stoddard
  • Patent number: 9197133
    Abstract: Disclosed are a voltage waveform detector, a power controller and a control method used therein, adaptive for a switched-mode power supply having a power switch and an inductive device. A disclosed power controller has a voltage waveform detector and a constant-current control unit. The voltage waveform detector estimates a discharge time of the inductive device when the power switch is turned off. In the voltage waveform detector, a differential capacitor is coupled between an input node of a comparator and a feedback node, at which the feedback voltage corresponds to a reflection voltage of the inductive device. The constant-current control unit integrates a current-detection signal over the discharge time to control a maximum output current of the switched-mode power supply.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: November 24, 2015
    Assignee: SHAMROCK MICRO DEVICES CORP.
    Inventors: Jian-He Li, Chun-Ming Lin
  • Patent number: 9119251
    Abstract: According to an embodiment, an LED current control apparatus controls conduction of a switching transistor which is connected to a primary winding of a flyback convertor. The LED current control apparatus includes a pseudo sine wave generation unit, a synchronous control unit, a first comparator, a switch control unit, a crest value correction unit, and a pulse monitor control unit.
    Type: Grant
    Filed: August 26, 2013
    Date of Patent: August 25, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Shinichi Kiyota
  • Patent number: 9112426
    Abstract: A switch mode power supply (SMPS) system includes a rectifying circuit for coupling to an AC input voltage and a transformer having a primary winding for coupling to the rectifying circuit and a secondary winding coupled to the primary winding. The system also has a power switch coupled to the primary winding and a control circuit coupled to the power switch. The control circuit is configured to control current flow in the primary winding such that an envelop waveform formed by peak points of current pulses are in phase with the magnitude of the AC input voltage. Moreover, the SMPS system is configured to provide a constant average output current.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: August 18, 2015
    Assignee: BCD Semiconductor Manufacturing CO., LTd.
    Inventors: Shihai Zhu, Zeqiang Chen, Xuegang Ren, Yajiang Zhu
  • Patent number: 9101018
    Abstract: A system configured to provide current to power a solid-state light emitting diode in accordance with a dimming level, wherein the dimming level corresponds to an amount of light provided from the solid-state light emitting diode. The system includes a transformer and a switch. The transformer includes a coil. The transformer is configured to receive a first current. The coil is configured to, based on the first current, output a second current to power the solid-state light emitting diode. The switch is configured to, based on a dimming level that corresponds to the amount of light provided from the solid-state light emitting diode of the system, bleed a portion of the second current out of the coil to a ground reference in order to divert the portion of the second current from being supplied to the solid-state light emitting diode.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: August 4, 2015
    Assignee: Marvell World Trade Ltd.
    Inventors: Sehat Sutardja, Pantas Sutardja, Wanfeng Zhang, Jinho Choi
  • Patent number: 9065348
    Abstract: An isolated switching mode power supply, having: a transformer having a primary winding, a secondary winding and a third winding; a current limit comparator configured to provide a current limit signal based on the current sense signal and the peak current signal; a logic circuit configured to provide a logic control signal based on the frequency control signal and the current limit signal; a startup control circuit configured to generate a startup control signal based on the current sense signal; a load detecting circuit configured to provide a load detecting signal based on the second feedback signal and the switching signal; and a selector configured to provide the logic control signal or the startup control signal based on the load detecting signal.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: June 23, 2015
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Siran Wang, Junming Zhang, Yuancheng Ren
  • Patent number: 9042127
    Abstract: A method can be used for controlling the switching operation of a switching power converter that includes a semiconductor switch coupled in series to an inductor. The switching power converter consumes an input current from a power supply and provides an output current to a load. In each switching cycle a switch-on time instant is detected for the semiconductor switch. The semiconductor switch is closed thus enabling, at the detected switch-on time instant, the input current passing through the semiconductor switch. The semiconductor switch is opened after a desired on-time, during which the input current rises from zero to a peak value, has passed. A time interval is detected, in which the instantaneous output current is not zero. A first value that represents the peak of the input current is obtained during the on-time.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 26, 2015
    Assignee: Infineon Technologies Austria AG
    Inventor: Xiaowu Gong
  • Publication number: 20150137694
    Abstract: The present invention discloses a power supply circuit for driving an LED lamp and a power supply method. The power supply circuit is constituted by an AC-DC converter by adopting DCM-DCM. Also, the power supply circuit adopts a valley fill circuit to reduce rippling of output current and adopts the DCM-DCM to stabilize a link voltage, thereby realizing a power factor correction circuit having two-stage structures. Thus, an input voltage of the flyback converter may be improved, and a high reverse voltage may be applied.
    Type: Application
    Filed: May 31, 2013
    Publication date: May 21, 2015
    Inventors: Ju Pyo Hong, Jun Ho Kim
  • Patent number: 9036377
    Abstract: A method for controlling voltage crossing a power switch of a switched-mode power converter includes the steps of: controlling a switch frequency of the power switch of the switched-mode power converter to a first frequency as activating the switched-mode power converter; and then changing the switch frequency of the power switch to a second frequency after the switched-mode power converter is activated for a predetermined time; wherein the first frequency is lower than the second frequency.
    Type: Grant
    Filed: May 13, 2012
    Date of Patent: May 19, 2015
    Assignee: Leadtrend Technology Corp.
    Inventors: Yuan-Wen Chang, Ren-Yi Chen, Yi-Lun Shen
  • Patent number: 9036378
    Abstract: A power conversion system with adjustable frequency includes an electric transformer, a pulse width modulation driving controller, a switching transistor, a first and second voltage division resistors connected in series, an output diode and an output capacitor. The electric transformer receives the input power and generates the sensing current and induced current. The sensing current flows through the first and second voltage division resistors to generate the feedback signal. The induced current flows through the output diode and output capacitor to generate the output voltage to supply the load. The pulse width modulation driving controller determine whether the loading state of the load based on the feedback signal, and change the switching frequency according to the loading state and the input power, thereby increasing the whole efficiency of the power conversion system and achieving the aim of dynamically adjusting the optimal frequency.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: May 19, 2015
    Assignee: INNO-TECH CO., LTD.
    Inventors: Ching-Yuan Lin, Shu-Chia Lin, Chih Feng Lin
  • Patent number: 9035637
    Abstract: A power conversion system has a power converter configured to receive an input voltage signal, convert the input voltage to an output voltage signal, and provide the output voltage signal to a load and a closed loop compensator configured to receive the output voltage signal and a reference voltage signal, the closed loop compensator configured to transmit an error signal indicative of a difference between the output voltage signal and the reference voltage signal. The power conversion system further has a pulse with modulator configured to receive the error signal and modulate a control signal with the error signal to control the output voltage signal, the pulse width modulator configured to transmit the control signal to the power converter and logic configured to receive the error signal and control the closed loop compensator based upon the error signal.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: May 19, 2015
    Assignee: The Board of Trustees of the University of Alabama for and behalf of the University of Alabama
    Inventor: Jaber A. Abu Qahouq
  • Patent number: 9030847
    Abstract: An inverter and driving method of the inverter are disclosed. The inverter includes an active clamp forward (ACF) converter and a flyback converter. One of a forwarding operation of delivering current from a primary side to a secondary side by using the ACF converter and a backwarding operation of delivering current from the secondary side to the primary side by using the flyback converter is selected to generate a rectified AC.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: May 12, 2015
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Sampat Shekhawat, Myungbok Kim, Donghye Cho
  • Patent number: 9025975
    Abstract: A switching power source is provided, which includes, a transformer, a switching unit configured to switch a voltage supplied to a primary side of the transformer, and an output unit configured to output a voltage generated at a secondary side of the transformer, wherein a switching cycle of the switching unit is set to be a predetermined period of time when the output unit outputs a first voltage, a first period of time and a second period of time are set to be longer than the predetermined period of time and are set to be different from each other.
    Type: Grant
    Filed: June 20, 2011
    Date of Patent: May 5, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuki Nakajima, Fumiaki Mizuno
  • Patent number: 9025348
    Abstract: A drive circuit drives a normally-on high-side switch Q1 and a normally-off low-side switch Q2 that form a series circuit connected in parallel with a DC power source. The drive circuit includes a controller 10 that outputs a control signal to turn on/off the high- and low-side switches, a rectifier D2 having a first end connected to a connection point of the high- and low-side switches, a capacitor C2 that is connected to a second end of the rectifier and a first end of the DC power source and serves as a power source for the controller, and a driver (A1, AND1, Q3, Q4) that turns on/off the high- and low-side switches according to the control signal from the controller and a voltage from the capacitor.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: May 5, 2015
    Assignee: Sanken Electric Co., Ltd.
    Inventors: Keiichiro Ozawa, Akio Iwabuchi, Yasushi Tasaka, Ryuichi Furukoshi
  • Publication number: 20150109832
    Abstract: There is provided a power supply device having a primary side and a secondary side isolated from each other. The power supply device includes: a power supply unit converting power from the primary side to output the converted power to the secondary side; a control unit located on the secondary side and acquiring control information on the power supply unit based on a voltage output from the power supply unit; and a delivery unit delivering the control information to the primary side, the delivery unit including a Y-capacitor that provides an EMI noise path between the primary side and the secondary side.
    Type: Application
    Filed: February 28, 2014
    Publication date: April 23, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Tae Won HEO, Hwan CHO, Jeong Gyu LIM, Sang Kyoo HAN, Young Seung NOH, Bo Mi LEE
  • Patent number: 8995150
    Abstract: The embodiments disclosed herein describe a method of a controller to maintain a substantially constant average output current at the output of a switching power converter. In one embodiment, the controller uses a regulation voltage that corresponds to the primary peak current regulation level to regulate the average output current.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: March 31, 2015
    Assignee: Dialog Semiconductor Inc.
    Inventors: Liang Yan, John William Kesterson, Xiaoyan Wang, Guang Feng, Clarita Poon
  • Patent number: 8994304
    Abstract: Disclosed is a method for controlling a permanent magnet synchronous motor to maximize use of voltages of a battery by voltage phase control within weak magnetic flux area and to achieve compensation for a torque error through a torque compensator when driving the permanent magnet synchronous motor for hybrid vehicles. In particular, the method controls a permanent magnet synchronous motor so that voltage use can be maximized in a weak magnetic flux area by using voltage near maximum voltage through voltage phase control utilizing magnetic flux-based map data receiving a torque command and motor speed/batter output voltage as inputs and torque error can be compensated using a torque compensation filter when a motor constant is changed in the weak magnetic flux by a circumstance parameter, when the permanent magnet synchronous motor mounted in a hybrid vehicle and an electric vehicle is driven.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: March 31, 2015
    Assignees: Hyundai Motor Company, Kia Motors Corporation, Industry-Academic Cooperation Foundation, Yeungnam University
    Inventors: Su Hyun Bae, Sung Kyu Kim, Won Kyoung Choi, Mu Shin Kwak, Jul Ki Seok, Se Hwan Kim
  • Patent number: 8988905
    Abstract: A PWM controller detecting temperature and AC line via a single pin and a power converter using the PWM controller, the PWM controller comprising: an output pin for providing a PWM signal; and a dual-function pin for receiving a temperature signal when the PWM signal is at a high level, and for receiving an AC line signal when the PWM signal is at a low level.
    Type: Grant
    Filed: November 12, 2012
    Date of Patent: March 24, 2015
    Assignee: Grenergy Opto, Inc.
    Inventors: Huang-Chi Lin, Chun-Liang Lin
  • Patent number: 8988903
    Abstract: The present disclosure provides systems and methods for protecting a switch mode power supply (SMPS). An SMPS may include an input power connector, an input rectifier and filter, a transformer, an output rectifier and filter, and an output power connector. A control circuit may selectively generate a switching signal for driving the transformer based on a feedback signal and a protection signal generated by a protection circuit. The protection circuit may generate the protection signal with an asymmetric duty cycle oscillating between an enable state and an inhibit state. The protection signal may inhibit the control circuit from generating the switching signal when the protection signal is in the inhibit state. A detection circuit may receive the feedback signal and selectively force the protection signal to the enable state when the feedback signal indicates that an output voltage is too high.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: March 24, 2015
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventor: Raymond W. Rice
  • Patent number: 8988904
    Abstract: The present invention relates to a power supply for controlling current that uses a flyback converter for electrical insulation between a load line unit and the power supply for controlling current. In a transformer (a flyback converter) having a flyback structure in the present invention, disclosed is a device which expects a current of the second coil by sensing a current of the first coil of the transformer, and controls the current flowing through the load line unit. A level detector is included, which updates a duty time or an on-time of the switch by transferring a reset signal to an integrator and a second sampler in accordance with a cycle of an input power. As a result, it is possible to reduce power loss by increasing a power factor through the adjustment of the phase of the current of the load line unit and an input voltage.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: March 24, 2015
    Assignee: Hideep Inc.
    Inventor: Bonkee Kim
  • Publication number: 20150078041
    Abstract: In one embodiment, harmonic control method for a flyback switching power supply, can include: (i) generating a sense voltage signal based on an output signal of the flyback switching power supply; (ii) generating a first compensation signal by determining and compensating an error between the sense voltage signal and a reference voltage; (iii) generating a second compensation signal by regulating the first compensation signal based on a duty cycle of a main power switch in the flyback switching power supply; and (iv) generating a control signal based on the second compensation signal and a triangular wave signal, to control the main power switch such that the output signal is substantially constant and an input current follows a waveform variation of an input voltage of the flyback switching power supply.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 19, 2015
    Inventor: Xiaodong Huang
  • Patent number: 8976546
    Abstract: A control integrated circuit for controlling a switch power supply, including: a voltage collecting module, configured to collect a feedback voltage based on an output voltage of the switch power supply; an error amplifying module, configured to compare the feedback voltage with a reference voltage and generate an error voltage; a time collecting module, configured to obtain a degaussing time signal based on the feedback voltage; and a constant voltage and current module, configured to collect a peak current feedback signal of a switch transistor, generate a control signal based on the error voltage, the degaussing time signal and the peak current feedback signal, wherein the control signal is for controlling an operating frequency and a duty ratio of the switch transistor, and control the switch transistor according to the control signal.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: March 10, 2015
    Assignees: Shenzhen BYD Auto R&D Company Limited, BYD Company Limited
    Inventors: Wenqing Wang, Xiaohua Yang, Chuntian Yu, Yuming Feng