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公开(公告)号：US20210111634A1
公开(公告)日：2021-04-15
申请号：US16888923
申请日：2020-06-01
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 , G01R19/165 , H03M1/12
Abstract: A flyback power converter includes a primary side controller circuit for controlling a primary side switch; and a secondary side controller circuit for generating an SR (Synchronous Rectification) signal to control an SR switch. The SR signal includes an SR pulse and a ZVS (Zero Voltage Switching) pulse. The SR pulse controls the SR switch for synchronous rectification at the secondary side. The secondary side controller circuit samples and holds a voltage at a first end of the SR switch as a first voltage at a timing between the end of the ZVS pulse and the beginning of the SR pulse, and determines a length of the ZVS pulse so as to control the SR switch to be conductive for a ZVS time period, whereby the primary side switch achieves ZVS. The first voltage is proportional to an input voltage.
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公开(公告)号：US10560012B1
公开(公告)日：2020-02-11
申请号：US16247520
申请日：2019-01-14
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Ta-Yung Yang , Tzu-Chen Lin , Chien-Fu Tang
Abstract: A ZVS (zero voltage switching) control circuit for use in a flyback power converter includes a primary side controller and a secondary side controller. The primary side controller generates a switching signal to control a power transformer through a power transistor to generate an output voltage. The secondary side controller generates an SR (synchronous rectifier) signal to control an SR transistor at a secondary side of the power transformer. The SR signal includes an SR-control pulse and a ZVS pulse. The SR-control pulse controls the SR transistor according to a demagnetizing period of the power transformer. The ZVS pulse determines the starting timing of the switching signal to achieve zero voltage switching for the power transistor. The secondary side controller generates the ZVS pulse after a delay time from when the power transformer is demagnetized. The delay time is determined according to an output load of the output voltage.
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公开(公告)号：US10528067B2
公开(公告)日：2020-01-07
申请号：US15925589
申请日：2018-03-19
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chen-Hui Chan , Wei-Hsu Chang , Ta-Yung Yang
Abstract: An interface device includes: at least one configuration channel terminal for communicating configuration information, wherein whether the interface device itself is in connection and whether the interface device itself is at a high voltage side or a low voltage side are determined according to a voltage or current status at the configuration channel terminal; a multi-functional transmission line, which includes a thermistor; and a temperature monitor circuit, coupled to the multi-functional transmission line, for sensing a temperature status to generate a temperature sensing signal. When two interface devices are connected with each other, the thermistor and the temperature monitor circuit can be located together in one of the interface devices or separately located in different interface devices.
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公开(公告)号：US20190149032A1
公开(公告)日：2019-05-16
申请号：US16134906
申请日：2018-09-18
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Ta-Yung Yang , Tzu-Chen Lin , Li-Di Luo , Pei-Sheng Tsu
Abstract: A ZVS (zero voltage switching) control circuit for use in a flyback power converter includes a primary side controller circuit, a secondary side controller circuit, and a pulse transformer. In one switching cycle, a synchronous rectifier transistor is turned ON twice to generate a circulation current at the primary side winding, and after the synchronous rectifier transistor is turned OFF, the power transistor is turned ON for zero voltage switching. A synchronous signal coupled between the primary side and the secondary side is employed to synchronize the power transistor and the synchronous transistor. The synchronous signal also triggers an SR-ZVS pulse to turn ON the synchronous rectifier transistor for achieving the zero voltage switching when the power transistor is turned ON.
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公开(公告)号：US09966833B2
公开(公告)日：2018-05-08
申请号：US15489479
申请日：2017-04-17
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Yang Chen , Ta-Yung Yang , Yu-Wen Chang
CPC classification number: H02M1/15 , H02M1/32 , H02M3/156 , H02M7/06 , H02M2001/0045 , H05B33/0809 , H05B33/0815 , H05B33/089
Abstract: The present invention discloses a switching regulator capable of reducing current ripple and a control circuit thereof. The switching regulator includes a buck power stage circuit and a control circuit. The control circuit includes an operation signal generation circuit and a current source circuit for reducing current ripple. The current source circuit is coupled to the operation signal generation circuit and the buck power stage circuit, for operating a ripple reduction switch therein according to an operation signal, to convert the output voltage to a load voltage between a load node and a reference node, and to reduce a current ripple of the output current, so as to generate a load current which is supplied to a load circuit, wherein the load circuit is coupled between the load node and the reference node, and the current source circuit is coupled between the output node and the load node.
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Patent Agency Ranking
公开(公告)号：US09966770B2
公开(公告)日：2018-05-08
申请号：US15255092
申请日：2016-09-01
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Wei-Hsu Chang , Ta-Yung Yang , Pei Yu Chiang
IPC: H02J7/00
CPC classification number: H02J7/0021 , H02J7/0045 , H02J7/0052 , H02J7/007 , H02J7/0072 , H02J2007/0059 , H02J2007/0062 , H02J2007/0096
Abstract: A charging apparatus includes a power conversion circuit for charging a battery, and a charging control circuit. The battery has a battery net voltage. The charging control circuit includes a conversion control circuit, a sensing circuit and a determining circuit. The conversion control circuit controls the power conversion circuit to generate plural pairs of DC output voltage levels and DC output current levels, wherein each DC output voltage level and its corresponding DC output current level are a voltage-current pair. The sensing circuit senses the DC output voltage levels and/or the DC output current levels. The determining circuit determines the battery net voltage according to plural voltage-current pairs.
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公开(公告)号：US20170353102A1
公开(公告)日：2017-12-07
申请号：US15489479
申请日：2017-04-17
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Yang Chen , Ta-Yung Yang , Yu-Wen Chang
CPC classification number: H02M1/15 , H02M1/32 , H02M3/156 , H02M7/06 , H02M2001/0045 , H05B33/0809 , H05B33/0815 , H05B33/089
Abstract: The present invention discloses a switching regulator capable of reducing current ripple and a control circuit thereof. The switching regulator includes a buck power stage circuit and a control circuit. The control circuit includes an operation signal generation circuit and a current source circuit for reducing current ripple. The current source circuit is coupled to the operation signal generation circuit and the buck power stage circuit, for operating a ripple reduction switch therein according to an operation signal, to convert the output voltage to a load voltage between a load node and a reference node, and to reduce a current ripple of the output current, so as to generate a load current which is supplied to a load circuit, wherein the load circuit is coupled between the load node and the reference node, and the current source circuit is coupled between the output node and the load node.
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公开(公告)号：US20170331381A1
公开(公告)日：2017-11-16
申请号：US15395641
申请日：2016-12-30
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yi-Wei Lee , Chien-Yang Chen , Isaac Y. Chen , Ta-Yung Yang
CPC classification number: H02M3/33507 , H02M1/088 , H02M1/4208 , H02M1/4225 , H02M1/4258 , H02M2001/0009 , H02M2001/4291 , H02M2003/1566
Abstract: The present invention provides a switching regulator with PFC function and a control circuit and a control method thereof. The switching regulator with PFC function includes a power stage circuit, a current sense circuit, and a control circuit. The power stage circuit operates at least one power switch therein according to an operation signal to convert an input voltage to an output voltage. When a transient voltage of the input voltage exceeds a transient voltage upper limit, or when a transient slew rate of the input voltage exceeds a transient slew rate upper limit, the control circuit adjusts a frequency response gain from a stable state frequency response gain to a transient state frequency response gain, such that a transient current of an output current does not exceed a current upper limit, and/or that a transient response time of the output current does not exceed a threshold transient time period.
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公开(公告)号：US12273035B2
公开(公告)日：2025-04-08
申请号：US18186973
申请日：2023-03-21
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Wei-Hsu Chang , Kuo-Chi Liu , Chao-Chi Chen
Abstract: A conversion control circuit controls plural stackable sub-converters which are coupled in parallel to generate an output power to a load, the conversion control circuit includes: a current sharing terminal, wherein a current sharing signal is configured to be connected to the current sharing terminals, in parallel, of the plurality of the conversion control circuits; and a current sharing circuit, configured to generate or receive the current sharing signal which is generated according to an output current of the output power; wherein the conversion control circuit adjusts the power stage circuit according to the current sharing signal for current sharing among the plural stackable sub-converters.
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公开(公告)号：US12199521B2
公开(公告)日：2025-01-14
申请号：US17840540
申请日：2022-06-14
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Yu-Chang Chen
Abstract: A synchronous full-bridge rectifier circuit includes: a first high-side transistor, a first low-side transistor, a second high-side transistor and a second low-side transistor which are configured to generate a DC power source from an AC power source, wherein the first high-side transistor and the first low-side transistor are coupled to a live wire of the AC power source, and the second high-side transistor and the second low-side transistor are coupled to a neutral wire of the AC power source; a first detection transistor, coupled to the live wire and configured to generate a first detection signal; and a second detection transistor, coupled to the neutral wire configured to generate a second detection signal; wherein the first low-side transistor is turned on after the body-diode of the first low-side transistor is turned on; the second low-side transistor is turned on after the body-diode of the second low-side transistor is turned on.
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