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Patent Agency Ranking
公开(公告)号：US10461624B2
公开(公告)日：2019-10-29
申请号：US15485226
申请日：2017-04-11
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Pei-Sheng Tsu , Chien-Fu Tang , Isaac Y. Chen
Abstract: The present invention provides a power switch control circuit and an open detection method thereof. The power switch control circuit is for generating an operation signal at an operation signal output pin according to an input signal, wherein the operation signal is for operating a power switch. The power switch control circuit includes: a current injection circuit, which is connected to the operation signal output pin, and provides a predetermined current to the operation signal output pin according to an enable signal; and an open detection circuit, which is coupled to the current injection circuit, and determines whether a connection between the operation signal output pin and the power switch is open according to a level of the operation signal output pin at a detection time point or according to a level variation of the operation signal output pin during a detection time period, whereby an open detection signal is generated.
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公开(公告)号：US10566893B2
公开(公告)日：2020-02-18
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：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：US09755695B2
公开(公告)日：2017-09-05
申请号：US15097240
申请日：2016-04-12
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yi-Min Shiu , Chao-Chi Chen , Pei-Sheng Tsu
IPC: H04B3/00 , H04B3/54 , G06F1/26 , G06F13/42 , G11C5/14 , G11C11/4096 , G11C11/4074
CPC classification number: H04B3/54 , G06F1/26 , G06F13/4282 , G09G2300/0408 , G09G2310/0289 , G11C5/14 , G11C11/4074 , G11C11/4096
Abstract: The present invention discloses an input/output (I/O) signal processing circuit and processing method. The I/O signal processing circuit includes a level adjustable I/O circuit and an adjustment circuit. The I/O signal processing circuit includes an output driver and/or an input comparator. The output driver transmits an output signal via a signal transmission line according to an output data. The output driver has an adjustable high operation voltage level and an adjustable low operation voltage level, which determine a high level and a low level of the output signal, respectively. The input comparator receives an input signal via the signal transmission line and comparing the input signal with an adjustable reference voltage, so as to generate an input data. The adjustment circuit generates an adjustment signal according to voltage drop related information, to correspondingly adjust the adjustable high and low operation voltage level and/or the adjustable reference voltage.
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公开(公告)号：US20180138797A1
公开(公告)日：2018-05-17
申请号：US15485226
申请日：2017-04-11
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Pei-Sheng Tsu , Chien-Fu Tang , Isaac Y. Chen
CPC classification number: H02M1/08 , H02H9/001 , H02H9/02 , H02M1/32 , H02M3/33523 , H02M3/33592 , H02M2001/0029 , Y02B70/1475
Abstract: The present invention provides a power switch control circuit and an open detection method thereof. The power switch control circuit is for generating an operation signal at an operation signal output pin according to an input signal, wherein the operation signal is for operating a power switch. The power switch control circuit includes: a current injection circuit, which is connected to the operation signal output pin, and provides a predetermined current to the operation signal output pin according to an enable signal; and an open detection circuit, which is coupled to the current injection circuit, and determines whether a connection between the operation signal output pin and the power switch is open according to a level of the operation signal output pin at a detection time point or according to a level variation of the operation signal output pin during a detection time period, whereby an open detection signal is generated.
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