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    SWITCHING CONTROLLER CIRCUIT AND METHOD FOR CONTROLLING FLYBACK POWER CONVERTER
    42.
    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.

    LIGHTING SYSTEM AND CONVERSION CONTROLLER CIRCUIT THEREOF
    43.
    发明申请
    LIGHTING SYSTEM AND CONVERSION CONTROLLER CIRCUIT THEREOF 有权

    公开(公告)号：US20210029791A1

    公开(公告)日：2021-01-28

    申请号：US16844947

    申请日：2020-04-09

    Applicant: RICHTEK TECHNOLOGY CORPORATION

    Inventor： Wei-Hsu Chang ,  Chang-Yu Wu

    IPC: H05B45/10 ,  H05B47/19 ,  H05B45/375 ,  H05B45/385 ,  H05B45/382 ,  H05B45/38

    Abstract: A lighting system includes: a power supply circuit, an AC-DC converter circuit and a wireless communication module. The wireless communication module receives an external command from a wireless communication device and generates an adjustment command according to the received external command. The adjustment command includes a luminance adjustment command and a driving power control command. The power supply circuit includes a power stage and a conversion controller circuit. The conversion controller circuit supplies a adjustable output voltage to the wireless communication module, to power the wireless communication module. The conversion controller circuit controls the power stage according to the luminance adjustment command, to adjust an output current of an output power, thereby adjusting the luminance of a light emission device. And, the conversion controller circuit controls the adjustable output voltage according to the driving power control command, to regulate the adjustable output voltage to a high voltage level or a low voltage level.

    CHARGING CONTROL METHOD, CHARGRING APPARATUS AND CHARGER CIRCUIT THEREFOF
    44.
    发明申请
    CHARGING CONTROL METHOD, CHARGRING APPARATUS AND CHARGER CIRCUIT THEREFOF 审中-公开

    公开(公告)号：US20190190278A1

    公开(公告)日：2019-06-20

    申请号：US16133818

    申请日：2018-09-18

    Applicant: RICHTEK TECHNOLOGY CORPORATION

    Inventor： Wei-Hsu Chang ,  Jing-Meng Liu ,  Ta-Yung Yang

    IPC: H02J7/00

    CPC classification number: H02J7/007

    Abstract: A charger circuit converts a supply voltage of a DC power supply to a charging voltage and a charging current to charge a battery. A battery charging method includes: setting the supply voltage to an initial voltage; checking whether the charging voltage reaches a predetermined voltage level; when the charging voltage is lower than the predetermined voltage level, delivering a control signal to the DC power supply to reduce the supply voltage; when the charging voltage or the charging current is reduced accordingly, delivering the control signal to the DC power to increase the supply voltage; and repetitively reducing and/or increasing the supply voltage until the charging voltage reaches the predetermined voltage level.

    FLYBACK POWER CONVERTER CIRCUIT WITH ACTIVE CLAMPING AND ZERO VOLTAGE SWITCHING AND CONVERSION CONTROL CIRCUIT THEREOF
    45.
    发明申请
    FLYBACK POWER CONVERTER CIRCUIT WITH ACTIVE CLAMPING AND ZERO VOLTAGE SWITCHING AND CONVERSION CONTROL CIRCUIT THEREOF 审中-公开

    公开(公告)号：US20180301974A1

    公开(公告)日：2018-10-18

    申请号：US15878483

    申请日：2018-01-24

    Applicant: RICHTEK TECHNOLOGY CORPORATION

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

    IPC: H02M1/08 ,  H02M3/335

    Abstract: A flyback power converter circuit includes: a transformer, including a primary winding coupled to an input power and a secondary winding coupled to an output node; a primary side switch coupled to the primary winding for switching the input power to generate an output power on the output node through the secondary winding; a clamping circuit including an auxiliary switch and an auxiliary capacitor which are connected in series to form an auxiliary branch which is connected with the primary winding in parallel; and a conversion control circuit adjusting an auxiliary dead time according to a primary side switch related signal and a switching voltage related signal such that the primary side switch is zero voltage switching at a time point when the primary side switch is turned ON.

    POWER SUPPLY SYSTEM AND POWER FACTOR CORRECTION CONTROL CIRCUIT AND CONTROL METHOD THEREOF
    47.
    发明申请
    POWER SUPPLY SYSTEM AND POWER FACTOR CORRECTION CONTROL CIRCUIT AND CONTROL METHOD THEREOF 有权

    公开(公告)号：US20240413744A1

    公开(公告)日：2024-12-12

    申请号：US18463244

    申请日：2023-09-07

    Applicant: Richtek Technology Corporation

    Inventor： Wei-Hsu Chang ,  Shih-Ho Hsu ,  Mao-Hui Kuo ,  Ta-Yung Yang

    IPC: H02M1/42 ,  H02M3/335

    Abstract: A power factor correction control circuit for correcting a power factor of a rectified power to generate an output power supplied to a load, includes: a reference voltage generator circuit generating a reference voltage according to a rectified voltage of the rectified power; and a feedback modulation circuit generating a modulation control signal based upon the reference voltage and a feedback signal related to an output voltage of the output power, to control at least one switch of a power stage circuit to switch an inductor in the power stage circuit and to thereby regulate the output voltage. The reference voltage generator circuit selects one of at least two candidate voltages as the reference voltage according to a comparison result between the rectified voltage and at least one threshold, such that the output voltage is at least partially positively correlated with the rectified voltage.

    Switched capacitor voltage converter circuit and switched capacitor voltage conversion method
    48.
    发明授权
    Switched capacitor voltage converter circuit and switched capacitor voltage conversion method 有权

    公开(公告)号：US12136877B2

    公开(公告)日：2024-11-05

    申请号：US18149112

    申请日：2023-01-01

    Applicant: Richtek Technology Corporation

    Inventor： Kuo-Chi Liu ,  Ta-Yung Yang ,  Wei-Hsu Chang

    IPC: H02M3/07 ,  H02M1/00 ,  H02M1/08

    Abstract: A switched capacitor voltage converter circuit for converting a first voltage to a second voltage, includes: a switched capacitor converter and a control circuit. The switched capacitor converter includes at least two capacitors, plural switches and at least one inductor. In a mode switching period wherein the switched capacitor converter switches from a present conversion mode to a next conversion mode, at least two forward switches of the plural switches operate in a unidirectional conduction mode. Each of the forward switches provides a current channel that unidirectionally flows toward the second voltage in the unidirectional conduction mode. The switched capacitor voltage converter circuit is also operable to convert the second voltage to the first voltage.

    Power factor correction converter, controller and zero current prediction circuit thereof
    49.
    发明授权
    Power factor correction converter, controller and zero current prediction circuit thereof 有权

    公开(公告)号：US12107492B2

    公开(公告)日：2024-10-01

    申请号：US18048066

    申请日：2022-10-20

    Applicant: Richtek Technology Corporation

    Inventor： Wei-Hsu Chang

    IPC: H02M1/42 ,  H02M1/00

    CPC classification number: H02M1/4225 ,  H02M1/0009 ,  H02M1/0058

    Abstract: A power factor correction converter includes a power stage circuit, a current sensing circuit and a zero current prediction circuit. The power stage circuit converts a rectified power to an output power. The power stage circuit operates in a boundary conduction mode to correct a power factor of the rectified power. The current sensing circuit senses an inductor current to generate a sensing signal. The zero current prediction circuit controls at least one switch by: generating a second period according to a first period, wherein the first period is between when the sensing signal passes a first threshold and when the sensing signal passes a second threshold; and switching a state of the at least one switch at an end time point of the second period, wherein the end time point corresponds to a zero current time point at which the inductor current reaches zero.

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