Patents Examined by Monica Mata
  • Patent number: 10320279
    Abstract: An example switched-mode power supply includes an input for receiving an input voltage from a voltage source, an output for providing an output voltage to a load, and a transformer having a primary winding, a secondary winding, and a conductive shield disposed between the primary winding and the secondary winding. The power supply also includes a neutralization signal generator circuit coupled to the conductive shield to apply a neutralization signal to the conductive shield to reduce a common mode noise between the primary winding and the secondary winding of the transformer. The neutralization signal has an adjustable amplitude and/or phase. Other example power supplies and methods are also disclosed.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: June 11, 2019
    Assignee: Astec International Limited
    Inventors: Wing Ling Cheng, Yuk Man Shing
  • Patent number: 10305387
    Abstract: A single active bridge converter is provided. The single active bridge converter includes a transformer including a primary winding and a secondary winding, a primary side circuit electrically coupled to the primary winding and including an H bridge circuit, and a secondary side circuit electrically coupled to the secondary winding, the secondary side circuit including a switch configured to selectively short the transformer secondary winding.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: May 28, 2019
    Assignee: ABB Schweiz AG
    Inventors: Said Farouk Said El-Barbari, Simon Herbert Schramm
  • Patent number: 10291129
    Abstract: In operation of a flybuck converter, a first output capacitor is charged and, after this charging, charge is transferred from the first output capacitor to a second output capacitor. The charge transferring includes closing a switch to establish a first current path through which the first output capacitor discharges current that induces, in a second current path, current that charges the second output capacitor. While the switch is closed during the charge transfer, a current limit condition in the switch is detected. In response to detection of the current limit condition, the switch is opened, and is thereafter closed again before attempting to charge the first output capacitor again, thereby to resume transferring charge from the first output capacitor to the second output capacitor.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: May 14, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Vijay Choudhary, Jose Vidal, Jr.
  • Patent number: 10291131
    Abstract: System and method for regulating an output of a power conversion system. An example system controller includes a signal generator and a modulation and drive component. The signal generator is configured to receive at least a first signal indicating a magnitude of an input voltage received by a primary winding of a power conversion system and receive a second signal indicating a magnitude of a primary current flowing through the primary winding, and generate a third signal. The modulation and drive component is configured to receive at least the third signal, generate a drive signal based on at least information associated with the third signal, and output the drive signal to a switch to affect the primary current.
    Type: Grant
    Filed: April 13, 2016
    Date of Patent: May 14, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Yuan Lin, Weihua Wang, Xiuhong Zhang, Lieyi Fang
  • Patent number: 10270343
    Abstract: A multiphase power supply includes several constant ON-time (COT) DC-DC converter integrated circuits (ICs), with each COT DC-DC converter IC providing an output voltage of a phase of the multiphase power supply. The COT DC-DC converter ICs are sequentially turned ON one after another in interleaved fashion. A COT DC-DC converter IC receives a control signal at a take pin and, in response, turns ON its output switch. The COT DC-DC converter IC generates another control signal at a pass pin. The next COT DC-DC converter IC turns ON its output switch in response to receiving the other control signal from the previous COT DC-DC converter IC.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: April 23, 2019
    Assignee: Monolithic Power Systems, Inc.
    Inventors: James Nguyen, Yan Dong, Jinghai Zhou, Rohan Samsi
  • Patent number: 10250141
    Abstract: A buck-boost power converter and a control circuit for the buck-boost converter. The control circuit includes a buck cycle pulse width modulation module and a boost cycle pulse width modulation module respectively having a first controllable hysteresis and a second controllable hysteresis. The buck cycle pulse width modulation module can regulate the first controllable hysteresis during the buck-boost power converter transits between a buck mode and a buck-boost mode so as to eliminate or at least reduce sparks in an output voltage. The boost cycle pulse width modulation module can regulate the second controllable hysteresis during the buck-boost power converter transits between the buck-boost mode and a boost mode so as to eliminate or at least reduce sparks in the output voltage.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: April 2, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Jian Zhang
  • Patent number: 10250116
    Abstract: The present invention particularly discloses a control circuit comprising a signal detection unit and a controller unit for reducing power loss of a LLC resonant converter during light-load or no-load operation. In the present invention, the signal detection unit is adopted for sensing a primary-side current from a transformer unit of the LLC resonant converter, and then converting the primary-side current to a reference voltage signal. Thus, according to a level variation of the reference voltage signal, the controller unit is able to properly regulate duty cycle of a switch controlling signal based on a duty cycle reduction percentage. Eventually, by using the switch controlling signal to control the periodic ON-OFF switching of power switches, power loss of the LLC resonant converter operated under light load or no load can be obviously reduced; moreover, working temperature of the power switches is simultaneously lowered.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: April 2, 2019
    Assignee: MEANWELL (GUANGZHOU) ELECTRONICS CO., LTD.
    Inventors: Ying-Hung Yen, Chih-Yuan Chang
  • Patent number: 10243471
    Abstract: A controller includes a first power circuit, a second power circuit, and a charging control circuit. The first power circuit is coupled to a bypass terminal and a first terminal to be coupled to receive charge from a secondary winding. The first power circuit transfers charge from the first terminal to the bypass terminal. The second power circuit is coupled to the bypass terminal and a second terminal to be coupled to a receive charge from an output of a power converter. The second power circuit transfers charge from the second terminal to the bypass terminal. The charging control circuit controls which of the first and second power circuits transfers charge to the bypass terminal.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: March 26, 2019
    Assignee: Power Integrations, Inc.
    Inventors: Alex B. Djenguerian, Sheng Liu, Leif Lund
  • Patent number: 10211728
    Abstract: Two or more power converters are connected in parallel to supply power current to a joining node through connecting resistors. An output voltage before the connecting resistor in each power converter is sampled and divided by a sampling ratio to generate sampled voltages for each power converter. A current sharing circuit for each power converter receives the local sampled voltage and another sampled voltage from another power converter. The current sharing circuit generates an adjustment voltage that is injected into a feedback loop. The adjustment voltage modifies the output voltage of the power converter, adjusting and balancing the power current delivered by that power converter. Power currents from several power converters are reduced and balanced when the same sampling ratio is used for all power converters. Current hogging by one power converter is prevented.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: February 19, 2019
    Assignee: Hong Kong Applied Science and Technology Research Institute Company, Limited
    Inventors: Xiaoyong Hu, Ziyang Gao, Tak Lok Shum
  • Patent number: 10193435
    Abstract: A start-up circuit to discharge EMI filter is developed for power saving. It includes a detection circuit detecting a power source for generating a sample signal. A sample circuit is coupled to the detection circuit for generating a reset signal in response to the sample signal. The reset signal is utilized for discharging a stored voltage of the EMI filter.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: January 29, 2019
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Wei-Hsuan Huang, Meng-Jen Tsai, Chien-Yuan Lin, Ming-Chang Tsou, Chuan-Chang Li, Gwo-Hwa Wang
  • Patent number: 10193347
    Abstract: A method for converting DC input power into AC output power comprising operating in a continuous mode, while the DC input power is at a first level, wherein DC input power is continuously converted into AC output power and applied to an AC power grid and upon detecting the DC input power is at a second level, operating in a burst mode, wherein a burst of AC output power for a half grid cycle is followed by a period of energy storage lasting an integer number of grid cycles.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: January 29, 2019
    Assignee: Enphase Energy, Inc.
    Inventor: Martin Fornage
  • Patent number: 10186965
    Abstract: A control circuit for a switching voltage regulator is configured to receive an error signal representative of a regulator output voltage in relation to a nominal output voltage, and includes a set/reset flip-flop, a hysteresis comparator and a logic circuit. The flip-flop is configured to produce a switching control signal according to logic values at its set and reset terminals. The comparator is configured to produce a set signal at the set terminal when an error signal drops below a first value, and a reset signal when the error signal rises above a second value. The logic circuit is configured to prevent transmission of the reset signal to the reset terminal during a selected minimum time period and to thereafter enable transmission of the reset signal, and further, to produce an alternate reset signal at the reset terminal at the end of the selected maximum time period.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: January 22, 2019
    Assignee: STMICROELECTRONICS S.R.L.
    Inventor: Alberto Bianco
  • Patent number: 10135348
    Abstract: In some embodiments, an inductor-inductor-capacitor (LLC) converter includes a transformer having a primary winding, a secondary winding, and an auxiliary winding. The primary winding is coupled to a primary side circuit and the auxiliary winding has a first winding portion coupled between a first terminal and a middle terminal, and a second winding portion coupled between the middle terminal and a second terminal. The LLC converter further includes a first diode coupled between the first terminal and a first node, a second diode coupled between the second terminal and the first node, and a switch coupled between the first node and a reference voltage terminal. The middle terminal of the auxiliary winding is coupled to the reference voltage terminal.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: November 20, 2018
    Assignee: INFINEON TECHNOLOGIES AUSTRIA AG
    Inventors: Anderson Hsiao, Gary Chang, Lawrence Lin
  • Patent number: 10128743
    Abstract: Disclosed is an integrated PFC and PWM controller with a plurality of frequency-load curves to minimize the no-load power consumption and maximize 4-point average efficiencies. The controller selects a frequency-load curve among the plurality of frequency-load and controls the PFC stage and the PWM stage to operate in HM, BM, DCM, or CCM based on the combined result from the input voltage and the output load sense signal, fetched respectively from the input terminal of the PFC stage and the output terminal of the PWM stage. The controller has the PSU operate in HM in case of no load, and operate in BM, DCM or CCM as the load increases across the flyback out rail.
    Type: Grant
    Filed: June 15, 2016
    Date of Patent: November 13, 2018
    Assignee: INNO-TECH CO., LTD.
    Inventors: Shu-Chia Lin, Ching-Yuan Lin, Chih Feng Lin, Wen-Yueh Hsieh
  • Patent number: 10128754
    Abstract: In a power conversion apparatus including first to fourth semiconductor switching elements connected in series across both terminals of a high voltage-side capacitor, the third and fourth semiconductor switching elements are connected across both terminals of a low voltage-side capacitor via a reactor, and both terminals of the second and third semiconductor switching elements are connected across a charging-discharging capacitor. This charging-discharging capacitor includes a plurality of capacitor elements connected in parallel via a first wiring and a second wiring. Inductance components or capacitance components of the plurality of capacitor elements when viewed from an outflow-inflow portion of the first wiring and an outflow-inflow portion of the second wiring are different from each other such that the charging-discharging capacitor does not have a parallel resonance point in a driving frequency band but has a parallel resonance point in a noise frequency band.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: November 13, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kengo Nishimura, Satoshi Ishibashi, Yuta Komatsu, Satoshi Murakami
  • Patent number: 10112495
    Abstract: A wireless vehicle charging system includes at least one controller configured to operate an inverter to control a voltage input to a power converter in a vehicle to drive an impedance phase angle at an output of the inverter toward a predetermined angle and achieve a power demand at an output of the vehicle power converter. The at least one controller is further configured to operate the vehicle power converter to achieve the power demand. The at least one controller may control a frequency output of the inverter to adjust the voltage input to the power converter based on a rate of change of an objective function that is configured to reduce an output power error of the power converter and an impedance phase angle error at the output of the inverter.
    Type: Grant
    Filed: July 27, 2015
    Date of Patent: October 30, 2018
    Assignee: Ford Global Technologies, LLC
    Inventors: Mohamed Elshaer, Hadi Malek, Richard William Kautz, Nevin Altunyurt, Christopher W. Bell
  • Patent number: 10075075
    Abstract: A buck-boost power converter and a mode transition control module. The mode transition control module includes a buck duty cycle sensing and comparison circuit and a boost duty cycle sensing and comparison circuit. The buck duty cycle sensing and comparison circuit can provide a first mode transition control signal through comparing a first signal indicative of a buck duty cycle with a first threshold signal indicative of a buck duty threshold to regulate the buck-boost power converter to transit between a buck mode and a buck-boost mode. The boost duty cycle sensing and comparison circuit can provide a second mode transition control signal through comparing a second signal indicative of a boost duty cycle with a second threshold signal indicative of a boost duty threshold to regulate the buck-boost power converter to transit between a the buck-boost mode and a boost mode.
    Type: Grant
    Filed: December 23, 2015
    Date of Patent: September 11, 2018
    Assignee: Chengdu Monolithic Power Systems, Co. Ltd.
    Inventor: Jian Zhang
  • Patent number: 10061335
    Abstract: Provided is a voltage regulator having satisfactory transient response characteristics. The voltage regulator includes: a first amplifier for detecting that undershoot occurs in an output voltage; a second amplifier for detecting that overshoot occurs in the output voltage; a first constant current circuit for increasing a bias current of an error amplifier circuit by a first amount for a first time period in response to a signal determined based on one of an output signal of the first amplifier and an output signal of the second amplifier; a second constant current circuit for increasing the bias current of the error amplifier circuit by a second amount larger than the first amount for a second time period shorter than the first time period in response to a signal determined based on the output signal of the first amplifier; and a first switch circuit for pulling up a gate of an output transistor in response to a signal determined based on the output signal of the second amplifier.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: August 28, 2018
    Assignee: ABLIC INC.
    Inventors: Tadashi Kurozo, Tomoyuki Yokoyama
  • Patent number: 10050525
    Abstract: Included are an output circuit, provided in a high side circuit, that selectively generates and outputs multiple kinds of pulse signal in accordance with the level of priority of a multiple of signals, a switch element, driven so as to be turned on and off by a pulse signal output from the output circuit, that is turned on and off to transmit the power supply voltage of the high side circuit to a low side circuit, a voltage conversion circuit, provided in the low side circuit, that converts the power supply voltage transmitted via the switch element into a pulse signal in the low side circuit, and a signal analysis circuit that analyzes the pulse signal obtained via the power conversion circuit and restores the multiple of signals.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: August 14, 2018
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Masashi Akahane
  • Patent number: 10038387
    Abstract: A control circuit of a flyback power converter according to the present invention comprises a low-side transistor, an active-clamper, a high-side drive circuit, and a controller. The low-side transistor is coupled to switch a transformer. The active-clamper is coupled in parallel with the transformer. The high-side drive circuit is coupled to drive the active-clamper. The controller generates a switching signal and an active-clamp signal. The switching signal is coupled to drive the low-side transistor. The switching signal is generated in accordance with a feedback signal for regulating an output voltage of the flyback power converter. The active-clamp signal is coupled to control the high-side drive circuit and the active-clamper. The active-clamp signal is generated in response to a predicted time of the transformer. The predicted time is determined in accordance with an input voltage, the output voltage and an on time of the switching signal.
    Type: Grant
    Filed: April 14, 2014
    Date of Patent: July 31, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Ta-Yung Yang