公开(公告)号：US20220140726A1

公开(公告)日：2022-05-05

申请号：US17499252

申请日：2021-10-12

Applicant: Richtek Technology Corporation

Inventor： Kuo-Chi Liu ,  Ta-Yung Yang ,  Chung-Lung Pai

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

Abstract: A resonant switching power converter includes: a first power stage circuit; a second power stage circuit; a controller; and a current sensing circuit configured to sense a first charging/discharging resonant current flowing through a first charging/discharging inductor of the first power stage circuit and sense a second charging/discharging resonant current flowing through a second charging/discharging inductor of the second power stage circuit, to generate a corresponding first current sensing signal and a corresponding second current sensing signal, respectively. The controller adjusts at least one of a first delay interval, a second delay interval, a third delay interval, a fourth delay interval, and/or input voltages, according to a first current sensing signal and a second current sensing signal, so that a constant ratio between an output current of the first power stage circuit and an output current of the second power stage circuit is achieved.

公开(公告)号：US20210399621A1

公开(公告)日：2021-12-23

申请号：US17325778

申请日：2021-05-20

Applicant: Richtek Technology Corporation

Inventor： Kuo-Chi Liu ,  Ta-Yung Yang ,  Chung-Lung Pai

IPC: H02M1/00 ,  H02M3/335

Abstract: A resonant switching power converter includes: at least one capacitor; switches coupled to the at least one capacitor; at least one charging inductor; at least one discharging inductor; and a zero current estimation circuit. The switches switch electrical connection relationships of capacitors according to an operation signal. The zero current estimation circuit estimates a time point at which a charging resonant current is zero during a charging process and/or estimate a time point at which a discharging resonant current is zero during at least one discharging process according to voltage differences across two ends of the charging inductor and/or the discharging inductor, so as to correspondingly generate a zero current estimation signal. The zero current estimation signal is adopted to generate the operation signal.

公开(公告)号：US20210384838A1

公开(公告)日：2021-12-09

申请号：US17245043

申请日：2021-04-30

Applicant: Richtek Technology Corporation

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

IPC: H02M3/335 ,  H02M1/00 ,  H03K17/78 ,  H04B10/80

Abstract: A flyback power converter circuit includes a transformer, a blocking switch, a primary side switch, a primary side controller circuit and a secondary side controller circuit. The transformer is coupled between an input voltage and an internal output voltage in an isolated manner. The blocking switch controls the electric connection between the internal output voltage and an external output voltage. In a standby mode, the internal output voltage is regulated to a standby voltage, and the blocking switch is controlled to be OFF; in an operation mode, the internal output voltage is regulated to an operating voltage, and the blocking switch is controlled to be ON, such that the external output voltage has the operating voltage. The standby voltage is smaller than the operating voltage, so that the power consumption of the flyback power converter circuit is reduced in the standby mode.

公开(公告)号：US20210376734A1

公开(公告)日：2021-12-02

申请号：US17334745

申请日：2021-05-30

Applicant: RICHTEK TECHNOLOGY CORPORATION

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

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

Abstract: A flyback power converter circuit includes: a power transformer, a primary side switch and a conversion control circuit. In a DCM, during a dead time, the conversion control circuit calculates an upper limit frequency corresponding to output current according to a frequency upper limit function, and obtains a frequency upper limit masking period according to a reciprocal of the upper limit frequency, wherein the frequency upper limit masking period is a period starting from when the primary side switch is turned ON. During an upper limit selection period, the conversion control circuit selects a valley among one or more valleys in a ringing signal related to a voltage across the primary side switch as an upper limit locked valley, so that the conversion control circuit once again turns ON the primary side switch at a beginning time point of the upper limit locked valley.

公开(公告)号：US20210376717A1

公开(公告)日：2021-12-02

申请号：US17244933

申请日：2021-04-29

Applicant: Richtek Technology Corporation

Inventor： Kuo-Chi Liu ,  Ta-Yung Yang ,  Chung-Lung Pai

IPC: H02M3/00 ,  H02M1/14 ,  H02M3/07 ,  H02M3/158

Abstract: A resonant switching power converter includes: capacitors; switches; at least one charging inductor; at least one discharging inductor; a controller generating a charging operation signal corresponding to charging process and discharging operation signals corresponding to discharging processes, to operate the switches to switch electrical connection relationships of the capacitors. In the charging process, the controller controls the switches via the charging operation signal, so that a series connection of the capacitors and the charging inductor is formed between the input voltage and the output voltage, which forms a charging path. In the discharging processes, the controller controls the switches via the discharging operation signals, so that a series connection of one of the capacitors and the discharging inductor is formed between the output voltage and a ground voltage level, to form plural discharging paths at different periods in a sequential order.

公开(公告)号：US11139742B2

公开(公告)日：2021-10-05

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 ,  H02M1/00

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.

公开(公告)号：US11018597B2

公开(公告)日：2021-05-25

申请号：US16783224

申请日：2020-02-06

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Ta-Yung Yang ,  Chao-Chi Chen ,  Chen-Hung Tsai ,  Chuh-Ching Li

IPC: H02M7/21 ,  H02M1/00

Abstract: A flyback power converter circuit includes: a transformer; a primary side switch, for controlling a primary winding to convert an input voltage to an output voltage and an internal voltage; a primary side control circuit, which is powered by the internal voltage; the primary side control circuit generates a switching signal according to a feedback signal, to operate the primary side switch; a secondary side control circuit, which generates the feedback signal according the output voltage; and a dummy load circuit, which is coupled to the output voltage, wherein when the output voltage drops to or is lower than a predetermined threshold, the dummy load circuit generates a dummy load current, to determine the feedback signal, so that the internal voltage is not undesirably low. When the output voltage exceeds the predetermined threshold, the dummy load circuit adjusts the dummy load current to zero current.

公开(公告)号：US20210074851A1

公开(公告)日：2021-03-11

申请号：US16868456

申请日：2020-05-06

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Chien-Wei Chiu ,  Ta-Yung Yang ,  Wu-Te Weng ,  Chien-Yu Chen ,  Kun-Huang Yu ,  Chih-Wen Hsiung ,  Kuo-Chin Chiu ,  Chun-Lung Chang

IPC: H01L29/78 ,  H01L29/10 ,  H01L29/40 ,  H01L21/765 ,  H01L29/66

Abstract: The present invention provides a high voltage device and a manufacturing method thereof. The high voltage device includes: a semiconductor layer, a drift oxide region, a well, a body region, a gate, at least one sub-gate, a source, and a drain. The drift oxide region is located on a drift region in an operation region. The sub-gate is formed on the drift oxide region right above the drift region. The sub-gate is parallel with the gate. A conductive layer of the gate has a first conductivity type, and a conductive layer of the sub-gate has a second conductivity type or is an intrinsic semiconductor structure.

公开(公告)号：US10601238B2

公开(公告)日：2020-03-24

申请号：US15390511

申请日：2016-12-25

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Wei-Hsu Chang ,  Ta-Yung Yang ,  Chih-Yuan Hsu

IPC: H02J7/00

Abstract: The present invention provides a charging apparatus, a charging control circuit, and a charging control method. The charging apparatus includes a power conversion circuit for generating a DC output voltage and charging a battery by a DC output current, and a charging control circuit for controlling the power conversion circuit. When the DC output voltage or the battery voltage rises to a first reference threshold voltage, the DC output current is adjusted downward by a current down step, and when the DC output voltage or the battery voltage falls to a second reference threshold voltage, the DC output current is adjusted upward by a current up step.

公开(公告)号：US20180301975A1

公开(公告)日：2018-10-18

申请号：US15892724

申请日：2018-02-09

Applicant: RICHTEK TECHNOLOGY CORPORATION

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

IPC: H02M1/08 ,  H02M3/335 ,  H02M1/088

CPC classification number: H02M1/083 ,  H02M1/088 ,  H02M3/33569 ,  H02M2001/0009 ,  H02M2001/0058

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