中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

34 records (took 0.021 seconds)

    Control Circuit Having Power Saving Mode for Use in Power Supply Circuit
    21.
    发明申请
    Control Circuit Having Power Saving Mode for Use in Power Supply Circuit 有权

    公开(公告)号：US20220181987A1

    公开(公告)日：2022-06-09

    申请号：US17534538

    申请日：2021-11-24

    Applicant: RICHTEK TECHNOLOGY CORPORATION

    Inventor： Ta-Yung Yang ,  Wei-Hsu Chang ,  Yu-Chang Chen ,  Tsung-Wei Huang ,  Shui-Mu Lin

    IPC: H02M3/335 ,  H02M1/08

    Abstract: A control circuit for controlling a power supply circuit to provide power to a system device which includes a communication circuit includes: a pulse width modulation (PWM) controller configured to switch a transformer of the power supply circuit to generate a first output voltage; and a switched capacitor converter configured to generate a second output voltage according to the first output voltage. The second output voltage provides power to the communication circuit, wherein the communication circuit generates a power saving signal to control the PWM controller and the switched capacitor converter. When the power saving signal is enabled, the first output voltage is decreased and a duty ratio of the switched capacitor converter is increased.

    RESONANT HALF-BRIDGE FLYBACK POWER CONVERTER AND PRIMARY CONTROLLER CIRCUIT AND CONTROL METHOD THEREOF
    22.
    发明申请
    RESONANT HALF-BRIDGE FLYBACK POWER CONVERTER AND PRIMARY CONTROLLER CIRCUIT AND CONTROL METHOD THEREOF 有权

    公开(公告)号：US20210408921A1

    公开(公告)日：2021-12-30

    申请号：US17341074

    申请日：2021-06-07

    Applicant: RICHTEK TECHNOLOGY CORPORATION

    Inventor： Ta-Yung Yang ,  Kun-Yu Lin ,  Yu-Chang Chen

    IPC: H02M3/335 ,  H02M1/38 ,  H02M1/08 ,  H02M1/00

    Abstract: A resonant half-bridge flyback power converter includes: a power transformer and a resonant capacitor which are coupled in series between a half-bridge power stage and an output power; and a primary controller circuit controlling a high side power switch and a low side power switch of the half-bridge power stage. When the high side switch is OFF, the control signal of the low side power switch includes a resonant switching pulse for achieving resonant switching of the low side switch and a soft switching pulse for achieving ZVS of the high side switch. When the output power is lower than a delay threshold, the primary controller circuit determines a delay period which is between the resonant switching pulse and the soft switching pulse to control both the high side power switch and the low side power switch to be OFF. The delay period is negatively correlated with the output power.

    SWITCHING CONTROLLER CIRCUIT AND METHOD FOR CONTROLLING FLYBACK POWER CONVERTER
    24.
    发明申请
    SWITCHING CONTROLLER CIRCUIT AND METHOD FOR CONTROLLING FLYBACK POWER CONVERTER 有权

    公开(公告)号：US20210126543A1

    公开(公告)日：2021-04-29

    申请号：US16879692

    申请日：2020-05-20

    Applicant: RICHTEK TECHNOLOGY CORPORATION

    Inventor： Wei-Hsu Chang ,  Ta-Yung Yang ,  Yu-Chang Chen ,  Chao-Chi Chen ,  Chuh-Ching Li ,  Li-Di Lo ,  Hao-Wen Chung

    IPC: H02M3/335 ,  H02M1/08

    Abstract: A switching controller circuit for controlling a flyback power converter includes: a power transformer, a primary side controller circuit and a secondary side controller circuit. The power transformer is coupled between the input voltage and the output voltage in an isolated manner. The primary side controller circuit controls a primary side switch of the flyback power converter. The secondary side controller circuit generates a synchronous rectification (SR) signal, to control an SR switch of the flyback power converter. The SR signal includes an SR pulse and a soft switching (SS) pulse. The SR pulse controls the SR switch to be ON for an SR period, to achieve synchronous rectification at the secondary side. The SS pulse controls the SR switch to be ON for an SS period, to achieve soft switching of the primary side switch.

    ADAPTIVE SLEW RATE RESONANT POWER CONVERTER AND CONVERSION CONTROL CIRCUIT AND CONTROL METHOD THEREOF
    26.
    发明申请
    ADAPTIVE SLEW RATE RESONANT POWER CONVERTER AND CONVERSION CONTROL CIRCUIT AND CONTROL METHOD THEREOF 有权

    公开(公告)号：US20250030337A1

    公开(公告)日：2025-01-23

    申请号：US18433417

    申请日：2024-02-06

    Applicant: Richtek Technology Corporation

    Inventor： Kun-Yu Lin ,  Hsin-Yi Wu ,  Yu-Chang Chen ,  Fu-Ciao Syu ,  Chia-Hsien Yang ,  Chien-Fu Tang ,  Ta-Yung Yang

    IPC: H02M3/00 ,  H02M1/00 ,  H02M1/08 ,  H02M3/335

    Abstract: A circuit of a resonant power converter comprising: a high-side switch and a low-side switch, coupled to form a half-bridge switching circuit which is configured to switch a transformer for generating an output voltage; a high-side drive circuit, generating a high-side drive signal coupled to drive the high-side switch in response to a high-side control signal; a bias voltage, coupled to a bootstrap diode and a bootstrap capacitor providing a power source from the bootstrap capacitor for the high-side drive circuit; wherein the high-side drive circuit generates the high-side drive signal with a fast slew rate to turn on the high-side switch when the high-side switch is to be turned on with soft-switching; the high-side drive circuit generates the high-side drive signal with a slow slew rate to turn on the high-side switch when the high-side switch is to be turned on without soft-switching.

    RESONANT AHB FLYBACK POWER CONVERTER AND SWITCHING CONTROL CIRCUIT THEREOF
    27.
    发明公开
    RESONANT AHB FLYBACK POWER CONVERTER AND SWITCHING CONTROL CIRCUIT THEREOF 审中-公开

    公开(公告)号：US20240275275A1

    公开(公告)日：2024-08-15

    申请号：US18168580

    申请日：2023-02-14

    Applicant: Richtek Technology Corporation

    Inventor： Ta-Yung Yang ,  Yu-Chang Chen ,  Hsin-Yi Wu ,  Kun-Yu Lin

    IPC: H02M3/00 ,  H02M1/08 ,  H02M1/32 ,  H02M3/335

    CPC classification number: H02M3/01 ,  H02M1/083 ,  H02M1/32 ,  H02M3/33571 ,  H02M3/33592

    Abstract: A resonant asymmetrical half-bridge flyback power converter includes: a first transistor and a second transistor switching a transformer coupled to a capacitor for generating an output power; a voltage divider coupled to an auxiliary winding of the transformer; a differential sensing circuit which includes a first terminal and a second terminal coupled to the voltage divider to sense an auxiliary signal generated by the auxiliary winding for generating a peak signal and a demagnetization-time signal; and a PWM control circuit configured to generate a first PWM signal and a second PWM signal in accordance with the peak signal and the demagnetization-time signal, for controlling the first transistor and the second transistor respectively; wherein a period of an enabling state of the demagnetization-time signal is correlated to the output power level; wherein the peak signal is related to a quasi-resonance of the transformer after the transformer is demagnetized.

    RESONANT HALF-BRIDGE FLYBACK POWER CONVERTER WITH SKIPPING CYCLES AND CONTROL METHOD THEREOF
    28.
    发明公开
    RESONANT HALF-BRIDGE FLYBACK POWER CONVERTER WITH SKIPPING CYCLES AND CONTROL METHOD THEREOF 审中-公开

    公开(公告)号：US20240223093A1

    公开(公告)日：2024-07-04

    申请号：US18436023

    申请日：2024-02-08

    Applicant: Richtek Technology Corporation

    Inventor： Ta-Yung Yang ,  Ying-Chieh Su ,  Yu-Chang Chen

    IPC: H02M3/335 ,  H02M1/00 ,  H02M1/08

    CPC classification number: H02M3/33571 ,  H02M1/0058 ,  H02M1/083 ,  H02M3/33592 ,  H02M1/0009

    Abstract: A resonant half-bridge flyback power converter includes: a first transistor and a second transistor which form a half-bridge circuit; a transformer and a resonant capacitor connected in series and coupled to the half-bridge circuit; and a switching control circuit configured to generate a first driving signal and a second driving signal to control the first transistor and the second transistor respectively for switching the transformer to generate an output voltage. The first driving signal is configured to magnetize the transformer. The second driving signal includes at most one pulse between two consecutive pulses of the first driving signal. The switching control circuit generates a skipping cycle period when an output power is lower than a predetermined threshold. A resonant pulse of the second driving signal is skipped during the skipping cycle period. The skipping cycle period is increased in response to the decrease of the output power.

    RESONANT FLYBACK POWER CONVERTER AND SWITCHING CONTROL CIRCUIT AND METHOD THEREOF
    30.
    发明公开
    RESONANT FLYBACK POWER CONVERTER AND SWITCHING CONTROL CIRCUIT AND METHOD THEREOF 审中-公开

    公开(公告)号：US20240120845A1

    公开(公告)日：2024-04-11

    申请号：US18300458

    申请日：2023-04-14

    Applicant: Richtek Technology Corporation

    Inventor： Yu-Chang Chen ,  Ta-Yung Yang ,  Kun-Yu Lin ,  Hsin-Yi Wu

    IPC: H02M3/335 ,  H02M1/08 ,  H02M3/00

    CPC classification number: H02M3/33571 ,  H02M1/083 ,  H02M3/01 ,  H02M3/33592

    Abstract: A resonant flyback power converter includes: a first transistor and a second transistor which are configured to switch a transformer and a resonant capacitor for generating an output voltage; and a switching control circuit generating first and second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal magnetizes the transformer. The second driving signal includes a resonant pulse having a resonant pulse width and a ZVS pulse during the DCM operation. The resonant pulse is configured to demagnetize the transformer. The resonant pulse has a first minimum resonant period for a first level of the output load and a second minimum resonant period for a second level of the output load. The first level is higher than the second level and the second minimum resonant period is shorter than the first minimum resonant period.

Patent Agency Ranking