Having Feedback Winding Inductively Coupled To Inverter Inductive Device (e.g., Tertiary Winding, Etc.) Patents (Class 363/21.16)
  • Patent number: 11323039
    Abstract: A method for improving the conversion efficiency of a CCM mode of a flyback resonant switch power supply, comprising: presetting a critical value Tset, calculating a time interval Ttap between adjacent zero points in the current connection time, outputting a shutdown signal at the zero points, and comparing the time interval Ttap with the preset critical value Tset; when Ttap>Tset, controlling the current shutdown time to be less than the shutdown time of the preceding cycle and outputting a start signal; when Ttap=0, controlling the current shutdown time to be greater than the shutdown time of the preceding cycle and outputting a start signal; and when 0<Ttap<=Tset, controlling the current shutdown time to be the same as the shutdown time of the preceding switch cycle and outputting a start signal.
    Type: Grant
    Filed: December 29, 2018
    Date of Patent: May 3, 2022
    Inventors: Weifeng Sun, Rongrong Tao, Hao Wang, Jinyu Xiao, Wei Su, Shen Xu, Longxing Shi
  • Patent number: 11264905
    Abstract: An embodiment DC to DC conversion circuit comprises a DC to DC converter and a regulation circuit. The regulation circuit comprises a comparator configured to detect, during a discharge phase of the DC to DC converter, an overshoot period during which an output voltage of the DC to DC converter exceeds a target voltage, and a timer configured to measure a duration of the overshoot period.
    Type: Grant
    Filed: August 3, 2020
    Date of Patent: March 1, 2022
    Assignee: STMICROELECTRONICS (GRAND OUEST) SAS
    Inventor: Lionel Cimaz
  • Patent number: 10924022
    Abstract: A flyback converter having a transformer that includes a primary coil connected to the input terminal and a secondary coil, a semiconductor switch configured to switch current flow through the primary coil, a first measurement unit configured to measure the DC input voltage, and a second measurement unit configured to measure a voltage across the semiconductor switch. The flyback converter also includes a control unit having a synchronization terminal and configured to output a switching signal to the semiconductor switch with a constant frequency in accordance with a synchronization signal input to the synchronization terminal. In addition, the flyback converter includes a frequency adjustment unit configured to transmit a synchronization signal to the synchronization terminal based on the DC input voltage and the voltage measured by the second measurement unit such that the frequency of the switching signal output from the control unit becomes variable.
    Type: Grant
    Filed: April 24, 2018
    Date of Patent: February 16, 2021
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventor: Manfred Krämer
  • Patent number: 10879793
    Abstract: System and method are provided for regulating a power converter. The system includes a signal processing component configured to receive a first input signal and a second input signal, process information associated with the first input signal and the second input signal, and output a drive signal to a switch based on at least information associated with the first input signal and the second input signal. The first input signal is associated with at least a feedback signal related to an output voltage of the power converter. The second input signal is associated with at least a primary current flowing through a primary winding of the power converter. The signal processing component is further configured to change a peak value of the primary current within a first predetermined range, and change the switching frequency of the power converter within a second predetermined range.
    Type: Grant
    Filed: February 21, 2020
    Date of Patent: December 29, 2020
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Yuan Lin, Lieyi Fang
  • Patent number: 10855188
    Abstract: A flyback converter control architecture is provided in which primary-only feedback techniques are used to ensure smooth startup and detection of fault conditions. During steady-state operation, secondary-side regulation is employed. In addition, current limits are monitored during steady-state operation using primary-only feedback techniques to obviate the need for a secondary-side current sense resistor.
    Type: Grant
    Filed: September 30, 2019
    Date of Patent: December 1, 2020
    Assignee: DIALOG SEMICONDUCTOR INC.
    Inventors: Yong Li, Cong Zheng, Xiaoyan Wang, Wenduo Liu
  • Patent number: 10826399
    Abstract: A method includes generating a gain transition signal in response to any one of an average value of a feedback signal, a slope of the feedback signal, a slope of an input signal of the power converter, a maximum value of the input signal, and a minimum value of the input signal, and generating a first gain control signal and a second gain control signal in response to the gain transition signal. A gain transition controller includes a transition signal generator generating the gain transition signal and a gain control signal generator generating the first gain control signal and the second gain control signal in response to the gain transition signal.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: November 3, 2020
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Hyun-Chul Eum, Tae-Sung Kim, Young-Mo Yang, Sung-Won Yun, Woo-Kang Jin
  • Patent number: 10707767
    Abstract: Techniques are provided for avoiding an avalanche breakdown voltage across a synchronous rectification (SR) switch on the secondary side of an isolated switched-mode power converter operating in a low-power mode, e.g., a burst mode, during which a load of the power converter draws negligible current. This is accomplished via use of a two-level switch driver for controlling a power switch on the primary side of the power converter. The two-level switch driver is configured to source low current levels to a control terminal (e.g., gate) of the power switch during burst-mode operation. This low current reduces the slope of the rising edge of voltage pulses on the primary and secondary sides of the power converter which, in turn, limits the peak of the voltage ringing across the SR switch. By limiting the voltage in this manner, the SR switch avoids entering avalanche breakdown.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: July 7, 2020
    Assignee: Infineon Technologies Austria AG
    Inventors: Cesar Augusto Braz, Roberto Quaglino
  • Patent number: 10666128
    Abstract: A system for regulating an output of a switched mode power supply circuit is configured to provide electric power to a load. The system may include a filter circuit. The filter circuit may be configured to suppress ripple signals at the power output. The system may include a feedback sense circuit including at least one feedback input end and at least one feedback output end. The feedback sense circuit may be configured for generating a feedback signal based on an output ripple signal at a filter input end and a DC regulation signal at a filter output end. The at least one feedback output end may be configured to be electrically coupled to the switched mode power supply circuit. Further, a switching of the switched mode power supply circuit may be based on the feedback signal.
    Type: Grant
    Filed: June 6, 2019
    Date of Patent: May 26, 2020
    Inventor: Eric Seungwoo Choi
  • Patent number: 10651759
    Abstract: A switching power supply device includes: a rectifier circuit to which an AC input voltage is input; an input smoothing circuit smoothing a DC input voltage output from the rectifier circuit; a power converter circuit converting the DC input voltage and outputs an output voltage; an overvoltage detection circuit generating an input overvoltage detection signal which is activated when the DC input voltage is higher than a first reference voltage level; and a discharge circuit discharging stored charge stored in the input smoothing circuit. The power converter circuit includes a switching element. Switching of the switching element is stopped and discharging of the stored charge is started, with activation of the input overvoltage detection signal serving as a trigger, and when the input overvoltage detection signal is subsequently inactivated, the discharging is stopped and the switching of the switching element is resumed.
    Type: Grant
    Filed: February 21, 2019
    Date of Patent: May 12, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Masatoshi Tanioku, Takashi Saji
  • Patent number: 10643678
    Abstract: A clock generation circuit, which generates an output clock using an external clock as a target clock, includes a circuit arranged to change the output clock to high level in synchronization with an up edge of the target clock, circuits arranged to generate first and second ramp voltages with a period of interval between neighboring up edges of the target clock, and a circuit arranged to hold a comparison voltage corresponding to a second ramp voltage when an up edge of the target clock occurs. The level of the output clock is changed from high level to low level based on a comparison result between the first ramp voltage and the comparison voltage.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: May 5, 2020
    Assignee: Rohm Co., Ltd.
    Inventors: Takehiro Yoshida, Shun Fukushima
  • Patent number: 10630187
    Abstract: A switching power supply device has both a turn-on timing modulation function and a turn-off timing modulation function, performs the turn-off timing modulation in a PFM control region and the turn-on timing modulation in a PWM control region, and further continues at least one of the modulations even after the PFM control and the PWM control are switched from one to the other, to achieve a stable operation of the switching power supply device at the control switching boundary without significantly decreasing the modulation effect of frequency jitter control.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: April 21, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kensuke Takahashi, Takashi Saji
  • Patent number: 10615681
    Abstract: A rectifying element is connected to an auxiliary winding. The shut-down circuit receives a bias voltage output from the rectifying element. A shut-down circuit stops supply of power to a power supply terminal of the power supply control IC when the bias voltage is less than a set voltage. A power supply control IC controls a ratio of on-time to a switching cycle of the switching element, based on a current sensing voltage generated at a current sense resistor. The power supply control IC causes the switching operation of the switching element to stop when a voltage at the power supply terminal decreases to a stop voltage or less.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: April 7, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takafumi Nonaka, Kentaro Oshima, Teruyoshi Sato, Norihiro Suzuki
  • Patent number: 10554068
    Abstract: An electrical circuit for charging a secondary battery that comprises a dc-converter and an output connector that can be connected to the positive terminal of the secondary battery for applying a charging current to the secondary battery. The dc-converter has a voltage feedback connector for sensing a feedback voltage, wherein the dc-converter is adapted to regulate the output voltage by adjusting the output current at the output connector depending on the sensed feedback voltage and a feedback-sub-circuit connected to the output connector and to the voltage feedback connector of the dc-converter.
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: February 4, 2020
    Assignee: Braun GMBH
    Inventors: Torsten Klemm, Lorraine Rispal, Ferdinand Hermann, Thomas Hohmann
  • Patent number: 10516338
    Abstract: Voltage converter controllers, voltage converters and methods are discussed regarding the adjustment of an on-time of an auxiliary switch of a voltage converter. First and second voltages are measured before a primary switch of the voltage converter is turned on and while the primary switch is turned on, and the on-time is adjusted based on the voltages.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: December 24, 2019
    Assignee: Infineon Technologies Austria AG
    Inventors: Xiaowu Gong, Gerald Deboy, Yong Siang Teo, Zan Wang
  • Patent number: 10381932
    Abstract: A power conversion device includes a primary side rectifier, a main converter, a secondary side rectifier, a secondary side feedback controller, a PWM controller, and a driving compensator. The primary side rectifier is configured to generate a first voltage. The main converter includes a power transistor and is configured to adjust the first voltage to generate a second voltage according to a control signal. The secondary side rectifier is configured to generate an output voltage according to the second voltage. The secondary side feedback controller is configured to generate a feedback signal according to the output voltage. The PWM controller is configured to generate a PWM signal according to the feedback signal. The driving compensator includes a driving resistor circuit. The PWM signal outputs the control signal through the driving resistor circuit, and the driving compensator adjusts a resistance value of the driving resistor circuit according to the first voltage.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: August 13, 2019
    Assignee: CHICONY POWER TECHNOLOGY CO., LTD.
    Inventors: Ssu-Hao Wang, Tso-Jen Peng
  • Patent number: 10381935
    Abstract: A sample-and-hold circuit includes a first voltage generation unit, a second voltage generation unit, a stabilization capacitor. The first voltage generation unit generates a first voltage according to a first predetermined delay time and a voltage corresponding to an auxiliary winding of a power converter. The second voltage generation unit generates a second voltage according to K multiple of a discharge time of a secondary side of the power converter during a previous period of the power converter and the voltage, wherein K<1. When a sum of the K multiple of the discharge time and a second predetermined delay time leads a first valley of the voltage corresponding to a current period of the power converter, the second voltage generation unit outputs the second voltage. When the sum lags the first valley, the first voltage generation unit outputs the first voltage.
    Type: Grant
    Filed: April 17, 2018
    Date of Patent: August 13, 2019
    Assignee: Leadtrend Technology Corp.
    Inventors: Hsin-Hung Lu, Kuan-Hsien Chou
  • Patent number: 10367424
    Abstract: A control arrangement is disclosed for a switch mode power supply (SMPS), the SMPS comprising an opto-coupler configured to transfer, from a secondary side to a primary side of the switch mode power supply by means of an LED current, a control signal indicative of an error between an amplifier-reference-signal and an amplifier-sensed-signal indicative of an actual value of an output parameter, the control arrangement comprising: an error amplifier configured to integrate the error to determine the LED current; and a feedback loop configured to adjust the magnitude of the LED current by modifying the amplifier-reference-signal or the amplifier-sensed-signal in order to reduce the error. A SMPS comprising such a control arrangement, and a corresponding method is also disclosed.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: July 30, 2019
    Assignee: NXP B.V.
    Inventors: Hans Halberstadt, Frank van Rens
  • Patent number: 10348181
    Abstract: Provided is a power control apparatus for sub-modules in an MMC, which controls stable supply of power to sub-modules in MMC connected to an HVDC system and a STATCOM. The power control apparatus has at least one first resistor connected between P and N buses of MMC; a second resistor connected in series with the first resistor; a switch connected in series with the second resistor; a third resistor connected in parallel with the second resistor and the switch which are connected in series; a Zener diode connected in parallel with the third resistor; and a DC/DC converter connected between both ends of the Zener diode and configured to convert voltage across both ends of the Zener diode into low voltage, and supply the low voltage to the sub-modules, wherein a magnitude of current flowing through the Zener diode is controlled depending on ON/OFF switching of the switch.
    Type: Grant
    Filed: December 29, 2015
    Date of Patent: July 9, 2019
    Assignee: HYOSUNG HEAVY INDUSTRIES CORPORATION
    Inventors: June-Sung Kim, Hong-Ju Jung, Jung-Soo Park, Doo-Young Lee, Jong-Yun Choi
  • Patent number: 10320302
    Abstract: The proposed variant devices are intended for producing a highly stable constant voltage in a wide range of output voltages. A highly stable constant voltage is produced by generating a control signal which adjusts the relative pulse duration as a constant voltage is converted into a pulse voltage, taking into account a constant voltage setpoint value in the load, while also stabilizing a constant current and reducing the pulse components in the constant current through the use of negative feedback.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: June 11, 2019
    Assignee: Closed-Up Joint-Stock Company Drive
    Inventors: Yuriy Igorevich Romanov, Stanislav Vladimirovich Maletskiy
  • Patent number: 10298221
    Abstract: In some examples, a control circuit is configured to control a transistor, and the control circuit includes a leading-edge detection unit configured to detect a time interval that corresponds to a leading-edge current spike through the transistor, wherein the time interval is independent of temperature. In some examples, the control circuit also includes a blanking unit configured to prevent the control circuit from turning off the transistor during the time interval.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: May 21, 2019
    Assignee: Infineon Technologies Austria AG
    Inventor: Xiaowu Gong
  • Patent number: 10256731
    Abstract: Apparatus and associated methods relate to continuously providing power to a load throughout an interruption of a power source. While the power source is providing power, a converter is exciting a primary winding of a transformer. A load winding of the transformer delivers power to a load connected thereto, and a holdup winding provides power to a holdup circuit, which stores energy for use when the power source is interrupted. A turns ratio of the holdup winding to the primary winding is greater than one so that the energy stored by the holdup circuit is at a voltage that is greater than or equal to the voltage used for exciting the primary windings. If the voltage used for exciting the primary windings falls below a predetermined threshold, a one-shot controls the transfer of energy stored in the holdup circuit to a storage capacitor supplying current to the primary windings.
    Type: Grant
    Filed: April 17, 2017
    Date of Patent: April 9, 2019
    Assignee: Simmonds Precision Products, Inc.
    Inventor: Robbie W. Hall
  • Patent number: 10148181
    Abstract: In one form, a switched mode power supply controller with frequency foldback includes a pulse width modulator responsive to a clock signal to generate a drive signal having a pulse width that varies in response to a feedback signal, and a variable frequency oscillator having a first input for receiving the feedback signal, a control input for receiving a programmable control signal defining a foldback starting frequency, a foldback ending frequency, a foldback starting voltage, and a foldback ending voltage, and an output for providing the clock signal having a variable frequency that varies over a range between the foldback starting frequency and the foldback ending frequency as the feedback signal varies between the foldback starting voltage and the foldback ending voltage, respectively. In another form, a switched mode power converter uses such a switched mode power supply controller with an inductive element, switch, and feedback circuit.
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: December 4, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Ajay Karthik Hari, Bryan Wayne McCoy, Thomas Ciccone
  • Patent number: 10116161
    Abstract: A line ripple compensation technique is provided for a switching power converter operating in both a pulse frequency mode of operation and a pulse width modulation mode of operation.
    Type: Grant
    Filed: January 13, 2017
    Date of Patent: October 30, 2018
    Assignee: DIALOG SEMICONDUCTOR INC.
    Inventors: Kai-Wen Chin, Fuqiang Shi, Pengju Kong, David Nguyen
  • Patent number: 10075082
    Abstract: A power supply detects a falling rate of an output voltage for fast load-transient response. The power supply with a primary side and a secondary side isolated from each other comprises a primary-side control circuit and a secondary-side control circuit. The primary-side control circuit controls a power switch to convert an input power source on the primary side into an output power source on the secondary side. The output power source has the output voltage. The secondary-side control circuit detects the falling rate and sending information to the primary-side control circuit when the falling rate exceeds a predetermined rate. In response to the information, the primary-side control circuit starts anew switching cycle of the power switch.
    Type: Grant
    Filed: November 25, 2016
    Date of Patent: September 11, 2018
    Assignee: LEADTREND TECHNOLOGY CORPORATION
    Inventors: Ching-Tsan Lee, Chung-Wei Lin, Yang-Sheng Lin
  • Patent number: 10056774
    Abstract: A discharge device provided with a switching unit configured by a first switch element and a second switch element connected in series, a first power storage element connected in parallel with both ends of the switching unit, a second power storage element connected in parallel with both ends of the second switch element, and a control unit which controls on/off switching of the first switch element and the second switch element in such a manner that a portion of the energy charged in the first power storage element is charged and discharged at least once by the second power storage element, and the energy charged in the first power storage element is discharged while being consumed in one or all of the first switch element and the second switch element.
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: August 21, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toru Daigo, Nobuhiro Kihara, Yuji Kuramoto
  • Patent number: 9985532
    Abstract: A switching power converter controller is provided that transitions between constant voltage pulse frequency modulation operation and constant current operation responsive to a comparison of a peak voltage for the constant voltage pulse frequency modulation operation and a peak voltage for the constant current operation.
    Type: Grant
    Filed: January 9, 2017
    Date of Patent: May 29, 2018
    Assignee: DIALOG SEMICONDUCTOR INC.
    Inventors: Juyoung Yoon, Fuqiang Shi
  • Patent number: 9985538
    Abstract: In accordance with embodiments of the present disclosure, a switch mode power supply may include a transformer, a controller configured to generate a periodic switching signal, a switching transistor coupled between a sense node and the transformer, primarily configured to prevent or permit current flow in the transformer primary winding in accordance with the switching signal, a sense resistor coupled to the switching transistor at a sense node, and a limit circuit configured to obtain a voltage of the sense node at a particular point of the switching period as an indicator of the primary winding current, detect a duration of a demagnetizing interval, and generate a limit signal, based on the sense node voltage and the demagnetizing interval, indicating a power supply output current exceeding a limit threshold.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: May 29, 2018
    Assignee: Dell Products L.P.
    Inventors: Wei Cheng Yu, Tsung-Cheng Liao, Merle Jackson Wood, III, Yan Yang, Keith J. Kasprzak
  • Patent number: 9899970
    Abstract: A high-power solid-state RFPA includes an output stage having a power transistor and a current enhanced driver that drives the output stage. The current enhanced driver includes an inductor and first and second transistors arranged in totem-pole-like configuration. When the first transistor is turned on and the second transistor is turned off, the inductor supplies a first charging current to the output stage, to assist in charging the input gate-source capacitor (Cgs) of the power transistor in the output stage. The first transistor further provides a second charging current that supplements the first charging current, thereby enhancing charging of the gate-source capacitor Cgs. Conversely, when the first transistor of the driver is turned off and the second transistor is turned on, the second transistor provides a discharge path through which the gate-source capacitor Cgs can discharge.
    Type: Grant
    Filed: June 18, 2015
    Date of Patent: February 20, 2018
    Assignee: Eridan Communications, Inc.
    Inventor: Chandra Khandavalli
  • Patent number: 9812972
    Abstract: A switching converter converts an input signal to a regulated output signal using a switch and a transformer with a primary winding and a secondary winding. A wake up management circuit receives a transformer demagnetization signal and forces by wake up pulses the switch on when the switching converter operates in a burst mode. Sampled values of the transformer demagnetization signal are received. A setting circuit sets a first peak value of the current of the primary winding. A comparison circuit compare the sampled values with a voltage threshold and the preceding sampled value. In response thereto, the first peak value of the primary winding current is either maintained or a new peak value is set.
    Type: Grant
    Filed: October 20, 2016
    Date of Patent: November 7, 2017
    Assignee: STMicroelectronics S.r.l.
    Inventors: Salvatore Tumminaro, Andrea Rapisarda, Alfio Pasqua
  • Patent number: 9794993
    Abstract: A light-emitting diode (LED) driving device comprising: a rectifier configured to convert alternating current (AC) power to direct current (DC) power; a convertor including: a transformer including a primary-side winding connected to the rectifier; and a main switch connected to the primary-side winding of the transformer; a controller configured to output a control signal to the main switch in response to a feedback signal; and an output modifier configured to modify the feedback signal.
    Type: Grant
    Filed: February 3, 2016
    Date of Patent: October 17, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Bong Jin Lee
  • Patent number: 9787134
    Abstract: A micro power outages compensation module for at least one server includes one or more capacitive storage element for storing electrical energy which is releasable for compensating the outages, the module further including a controller for the charging and/or the discharge of the capacitive storage element(s), limiting the charging and/or discharge current of the capacitive storage element(s) sufficiently to enable hot plugging and/or unplugging of the module even during operation of the server.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: October 10, 2017
    Assignee: BULL SAS
    Inventor: Georges Lecourtier
  • Patent number: 9780673
    Abstract: A control device for controlling a switching power supply adapted to convert an input voltage into an output voltage according to a switching rate of a switching element. The control device includes first control means for switching the switching element in a first working mode at a constant frequency and second control means for switching the switching element in a second working mode at a variable frequency, under a maximum frequency, in response to the detection of a predefined operative condition of the switching power supply. The control device further includes means for selecting the first working mode or the second working mode.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: October 3, 2017
    Assignee: STMicroelectronics S.r.l.
    Inventors: Giovanni Lombardo, Claudio Adragna, Salvatore Tumminaro
  • Patent number: 9774259
    Abstract: A multiple-output DC-DC converter has a first and a second DC-DC sub-converter, each DC-DC subconverter may be a buck, boost, or buck-boost converter having a primary energy-storage inductor. Each DC-DC subconverter drives a separate output of the multiple-output converter and typically has a separate feedback control circuit for controlling output voltage and/or current. The converter has a common timing circuit to maintain a phase offset between the first and DC-DC subconverters. The primary energy storage inductors of the first and second DC-DC converter are magnetically coupled to raise an effective ripple frequency of the converter and simplify output filtering.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: September 26, 2017
    Assignee: Volterra Semiconductor LLC
    Inventors: Alexandr Ikriannikov, Ognjen Djekic
  • Patent number: 9704641
    Abstract: The present invention relates to a transmitter and power supply which suffers little EMI deviation and provides adequate margin even in volume production, and which can cut the unit price of transformers and economize on the costs of EMI filters, by cancelling out and eliminating the conducted noise or the conducted noise and radiated noise caused by capacitive coupling between the windings of a transformer, the transformer being of an uncomplicated construction which is good in terms of production.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: July 11, 2017
    Inventor: Chan-Woong Park
  • Patent number: 9698695
    Abstract: A method of cycle-by-cycle operation of a switched-mode power converter includes converting an input voltage at the primary side to an output voltage at the secondary side by switching a transistor connected to the primary side from an on-state to an off-state during the present cycle, detecting valleys in a voltage across the transistor in the off-state, determining which valley at which the transistor is to be switched from the off-state to the on-state in the next switching cycle, and determining a maximum peak current limit for the primary side above which the transistor is switched from the on-state to the off-state in the next switching cycle. The maximum peak current limit is determined as a function of the input voltage and the valley at which the transistor is to be switched from the off-state to the on-state in the next switching cycle. Forced valley switching techniques are also disclosed.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: July 4, 2017
    Assignee: Infineon Technologies Austria AG
    Inventors: Marc Fahlenkamp, Torsten Hinz, Martin Krueger, Josef Neulinger
  • Patent number: 9584030
    Abstract: A controller for eliminating acoustic noise of a power converter includes a control unit and a gate signal generation unit. The control unit is used for detecting a frequency corresponding to a gate control signal in a burst mode of the power converter. When the frequency is greater than a predetermined frequency, the control unit increases a resistance of a compensation resistor coupled to a compensation pin of the power converter; and when the frequency is less than the predetermined frequency, the control unit decreases the resistance of the compensation resistor. The gate signal generation unit is coupled to the control unit for generating the gate control signal to a power switch of a primary side of the power converter according to the resistance of the compensation resistor. The power switch is turned on according to the gate control signal.
    Type: Grant
    Filed: June 8, 2015
    Date of Patent: February 28, 2017
    Assignee: Leadtrend Technology Corp.
    Inventors: Ming-Chang Tsou, Meng-Jen Tsai
  • Patent number: 9559600
    Abstract: An error amplifier outputs an error voltage to the primary side as a feedback signal indicating a state of the load. An oscillator controls a switching frequency of the switching operation such that the switching frequency is reduced from a highest normal frequency to a lowest normal frequency based on the feedback signal in a load range from a heavily-loaded state to a lightly-loaded state in a normal oscillating operation that continuously performs the switching operation. An intermittent oscillation control circuit intermittently performs the switching operation by stopping the switching operation based on the feedback signal when the load is lighter than a previously set reference. The oscillator increases the switching frequency from an intermittent-operation frequency lower than the lowest normal frequency in an intermittent oscillation duration in which the switching operation is performed in the intermittent oscillating operation.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: January 31, 2017
    Assignee: SANKEN ELECTRIC CO., LTD.
    Inventors: Akira Hayakawa, Masaaki Shimada, Tatsuhiko Koga
  • Patent number: 9520769
    Abstract: A switching converter converts an input signal to a regulated output signal using a switch and a transformer with a primary winding and a secondary winding. A wake up management circuit receives a transformer demagnetization signal and forces by wake up pulses the switch on when the switching converter operates in a burst mode. Sampled values of the transformer demagnetization signal are received. A setting circuit sets a first peak value of the current of the primary winding. A comparison circuit compare the sampled values with a voltage threshold and the preceding sampled value. In response thereto, the first peak value of the primary winding current is either maintained or a new peak value is set.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: December 13, 2016
    Assignee: STMicroelectronics S.r.l.
    Inventors: Alfio Pasqua, Salvatore Tumminaro, Andrea Rapisarda
  • Patent number: 9515547
    Abstract: In a DC power supply circuit (1), when an instantaneous value (Vin) of a voltage from a rectifier circuit (2) is higher than or equal to a voltage (VC2) across terminals of a capacitor (C2), in an ON period of a switching element (Q1), current flows along a first current path, from a high-potential output terminal of the rectifier, through a load (11), an inductor (L2), and the switching element in the stated order, and into a low-potential output terminal of the rectifier, and in an OFF period of the switching element, current flows along a second current path, from the high-potential output terminal of the rectifier, through the load, the inductor, a diode (D1), and the capacitor in the stated order, and into the low-potential output terminal of the rectifier.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: December 6, 2016
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masanobu Murakami, Kazushige Sugita, Kazuhiko Itoh
  • Patent number: 9502982
    Abstract: The present invention proposes a method for controlling an adaptive power converter. The method comprises: generating an output-sense signal by sampling a reflected voltage of a transformer; receiving a feedback signal related to an output power of the adaptive power converter; generating a clock signal in response to the feedback signal and the output-sense signal; generating a switching signal for switching the transformer and regulating an output voltage of the adaptive power converter. The reflected voltage is correlated to the output voltage of the adaptive power converter. The switching signal is generated in response to the feedback signal. The frequency of the switching signal is determined by the clock signal. The frequency of the switching signal is decreased in response to a decrement of the feedback signal.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: November 22, 2016
    Assignee: FAIRCHILD (TAIWAN) CORPORATION
    Inventors: Ta-Yung Yang, Jung-Sheng Chen, Li Lin
  • Patent number: 9484812
    Abstract: The present invention includes: a converter configured to convert the direct-current voltage of the rectifier to another direct-current voltage and supply to a load; a peak hold unit configured to hold a peak value of a current detected by a current detecting unit configured to detect a current flowing in the switching element; an averaging unit configured to convert, to a current, an output of an n/2 output unit, and then integrate and output the converted current, the n/2 output unit configured to output n/2 (n is an integer of 1 or more) of the held peak value only in a regeneration current period of the reactor; a control unit configured to turn the switching element on and off based on an output signal of the averaging unit in such a way that an average current value of a current flowing in the reactor is equal to a predetermined value.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: November 1, 2016
    Assignee: Sanken Electric Co., Ltd.
    Inventor: Mitsutomo Yoshinaga
  • Patent number: 9450496
    Abstract: A multi-stage power converter includes a pre-regulator circuit configured to provide a regulated output voltage, at least one DC/DC converter, and a control circuit coupled to the pre-regulator circuit and the DC/DC converter. The DC/DC converter is configured to provide an output voltage and an output current to a load. The DC/DC converter includes an input, an output, and at least one power switch. The input of the DC/DC converter is coupled to the pre-regulator circuit. The control circuit is configured to regulate the output voltage of the DC/DC converter and vary the regulated output voltage of the pre-regulator circuit as a function of the output current of the DC/DC converter.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: September 20, 2016
    Assignee: ASTEC INTERNATIONAL LIMITED
    Inventors: James Sigamani, Antonio Remetio Soleño
  • Patent number: 9444357
    Abstract: A controller includes a primary controller and a secondary controller to control switching of a power switch and a secondary switch, respectively, coupled to an energy transfer element of a power converter. A first drive circuit is coupled to generate a first drive signal to enable a first ON section of the secondary drive signal after an ON section of the primary drive signal. A second drive circuit is coupled to generate a second drive signal to enable a second ON section of the secondary drive signal to store energy in the energy transfer element. The energy stored in the energy transfer element during the second ON section is coupled to reduce a switch voltage across the power switch prior to a next ON section of the primary drive signal. The secondary drive signal is generated in response to the first drive signal and the second drive signal.
    Type: Grant
    Filed: April 9, 2015
    Date of Patent: September 13, 2016
    Assignee: Power Integrations, Inc.
    Inventors: David Michael Hugh Matthews, Balu Balakrishnan, Rajko Duvnjak, Roland Sylvere Saint-Pierre
  • Patent number: 9391509
    Abstract: A switching regulator having fast start-up time and low standby power is disclosed. In an exemplary embodiment, an apparatus includes a transistor that generates a charging current at a first current level from a base current received at a base terminal. The apparatus also includes a capacitor that charges in response to the charging current at the first current level to generate a voltage signal that increases at a first rate. The apparatus also includes a charge pump having an output coupled to the base terminal. The charge pump outputs a charge pump current when the voltage signal exceeds a first voltage level. The base current is increased by charge pump current to cause the transistor to generate the charging current at a second current level, and the capacitor charges in response to the charging current at the second current level to generate the voltage signal that increases at a second rate.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: July 12, 2016
    Assignee: Active-Semi, Inc.
    Inventors: Wei-Chung Wu, Degang Xia, Rulong Jiang
  • Patent number: 9370057
    Abstract: An interface circuit for a lighting device is described, the interface circuit comprising a single input terminal for receiving a input signal from a user interface; an output terminal for providing a control signal for controlling the lighting device, a detection circuit for receiving the input signal and identifying whether the input signal is either an analog 0-10V signal, a DALI protocol signal or a mains signal and a converter circuit for converting the input signal to the control signal based on the identification, and provide the control signal to the output terminal. The interface as described facilitates retrofitting existing lighting applications.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: June 14, 2016
    Assignee: ELDOLAB HOLDING B.V.
    Inventors: Marc Saes, Petrus Johannes Maria Welten
  • Patent number: 9369049
    Abstract: In one embodiment, an integrated switch mode power supply controller can include: a multiplexing pin that receives a detection voltage signal; a switch mode power supply that receives a DC input voltage, and operates in a switching cycle having first, second, and third time intervals; during the first time interval, the detection voltage signal is proportional to the DC input voltage, and a current compensation signal is generated according to the detection voltage signal to obtain a peak inductor current; during the second time interval, the detection voltage signal is proportional to an output voltage of the switch mode power supply, and a discharging duration of current through the inductor is determined based on the detection voltage signal; and during the third time interval, the detection voltage signal is proportional to a voltage across a power transistor of the switch mode power supply.
    Type: Grant
    Filed: January 9, 2014
    Date of Patent: June 14, 2016
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventor: Xiaoru Xu
  • Patent number: 9350249
    Abstract: Apparatus and methods disclosed herein are associated with a primary side voltage and/or current regulator (PSR) in a flyback power converter. Apparatus and methods sense characteristics of a waveform generated in an auxiliary primary winding of a flyback transformer at a single terminal of the PSR. The waveform is analyzed, and error signals derived therefrom are used to maintain constant voltage and/or constant current regulation and to generate a peak current stabilization signal that is independent of line input voltage.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: May 24, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Richard L. Valley
  • Patent number: 9337728
    Abstract: Devices and methods provide a protection device for maintaining a steady output on a gate driver terminal despite fluctuations in a power supply, the protection device including low voltage detection circuitry configured to monitor the power supply and detect fluctuations in the power supply; and gate isolation circuitry configured to isolate the gate driver terminal from the power supply if the low voltage detection circuitry detects a fluctuation in the power supply, wherein a voltage of the gate driver terminal is maintained within a preselected range when the gate is isolated.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: May 10, 2016
    Assignee: Fairchild Semiconductor Corporation
    Inventors: James E. Gillberg, Juergen Pianka
  • Patent number: 9293982
    Abstract: In some aspects of the invention, a switching power supply can include a control circuit that conducts feedback control of a pulse width of a driving signal for switching the switching element according to an output voltage and settle the output voltage to a specified voltage level; a frequency reducing circuit that is disposed in the control circuit and reduces a frequency of the driving signal for switching the switching element upon detection of an overload state and limits an output current; and an initial state setting circuit that sets the control circuit to an overload detecting state for a predetermined period of time in a startup period of the control circuit. The initial state setting circuit can pull down a control voltage for a soft start signal for soft starting to the ground potential to inhibit generation of the driving signal and pulls up a feedback voltage signal.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: March 22, 2016
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Hiroshi Maruyama
  • Patent number: 9280164
    Abstract: A switching power-supply device includes a switching element; an output circuit; a feedback signal generation circuit; a control circuit that drives the switching element, based on the feedback signal, and controls the voltage of the power-supply output; a correction circuit that corrects a signal level of the feedback signal, wherein the control circuit comprises: an oscillation circuit that generates an on-trigger signal; a current detection circuit that generates a current detection signal; a difference detection circuit that generates a difference detection signal; a comparison circuit that generates an off-trigger signal, based on the current detection signal and the difference detection signal; and a first load detection circuit that controls an operation of the correction circuit, based on the current detection signal, and wherein the control circuit changes a setting voltage of the power-supply output, according to the signal level of the feedback signal.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: March 8, 2016
    Assignee: Sanken Electric Co., LTD.
    Inventors: Jung Soo Lee, Satoshi Nakamoto, Chie Isshi, Masaru Nakamura