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公开(公告)号：US11545908B2
公开(公告)日：2023-01-03
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
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.
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2.发明申请公开(公告)号：US20220321012A1
公开(公告)日：2022-10-06
申请号：US17711343
申请日：2022-04-01
Applicant: Richtek Technology Corporation
Inventor： Yong-Cyuan Chen , Tzu-Chen Lin , Yi-Wei Lee , Ta-Yung Yang
Abstract: A switching regulator includes a first switch, a second switch, an inductor coupled to the first and second switches, and a control circuit. The control circuit controls the first switch to be ON for an ON time period. Next, the control circuit controls the first and second switches to be OFF for a first dead time period. Next, the control circuit controls the second switch to be ON for a synchronous rectification time period. Next, the control circuit controls the first and second switches to be OFF for a second dead time period. Next, the control circuit controls the second switch to be ON for a zero-voltage-switching pulse time period. Next, the control circuit controls the first and second switches to be OFF for a third dead time period. By the above operations, the first switch achieves soft switching.
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公开(公告)号：US10715028B2
公开(公告)日：2020-07-14
申请号：US16586916
申请日：2019-09-28
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Tzu-Chen Lin , Kun-Yu Lin , Li-Di Lo , Wei-Hsu Chang
Abstract: A ZVS (zero voltage switching) control circuit for controlling a flyback power converter includes: a primary side controller circuit for generating a switching signal, to control a primary side switch; and a secondary side controller circuit for generating a synchronous rectifier (SR) control signal for controlling a synchronous rectifier switch. The SR control signal includes an SR-control pulse and a ZVS pulse. The SR-control pulse controls the synchronous rectifier switch to perform secondary side synchronous rectification. The secondary side controller circuit determines a trigger timing point of the ZVS pulse according to a waveform characteristic of a ringing signal, to control the synchronous rectifier switch to be ON for a predetermined period, thereby achieving zero voltage switching of the primary side switch. The primary side or the secondary side controller circuit includes a jitter controller for performing jitter control on the ZVS pulse.
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公开(公告)号：US10177670B1
公开(公告)日：2019-01-08
申请号：US15965915
申请日：2018-04-28
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Tzu-Chen Lin , Kun-Yu Lin
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 controlling the primary side winding to convert the input power to an output power on the output node through the secondary side winding, 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 auxiliary ON time of the auxiliary switch during an OFF time of the primary side switch according to an estimated parasitic diode conduction time of a parasitic diode of the auxiliary switch; the auxiliary ON time is controlled to be substantially equal to and coincides with the estimated parasitic diode conduction time.
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5.发明申请公开(公告)号：US20170163162A1
公开(公告)日：2017-06-08
申请号：US15433761
申请日：2017-02-15
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuang-Fu Chang , Tzu-Chen Lin , Chien-Fu Tang
IPC: H02M3/335 , H03K17/785 , H02M1/08 , H03L7/00
CPC classification number: H02M3/33523 , H02M2001/0032 , Y02B70/16
Abstract: The present invention provides a flyback power converter with a programmable output and a control circuit and a control method thereof. The flyback power converter converts an input voltage to a programmable output voltage according to a setting signal, wherein the programmable output voltage switches between different levels. The flyback power converter includes: a transformer circuit, a power switch circuit, a current sense circuit, an opto-coupler circuit, and a control circuit. The control circuit adaptively adjusts an operation signal according to a level of the programmable output voltage, to maintain a same or relatively higher operation frequency of the operation signal when the programmable output voltage switches to a relatively lower level, so as to maintain a phase margin while supplying the same output current.
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Patent Agency Ranking
6.发明授权公开(公告)号：US09614449B2
公开(公告)日：2017-04-04
申请号：US14879175
申请日：2015-10-09
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuang-Fu Chang , Tzu-Chen Lin , Chien-Fu Tang
CPC classification number: H02M3/33523 , H02M2001/0032
Abstract: The present invention provides a flyback power converter with a programmable output and a control circuit and a control method thereof. The flyback power converter converts an input voltage to a programmable output voltage according to a setting signal, wherein the programmable output voltage switches between different levels. The flyback power converter includes: a transformer circuit, a power switch circuit, a current sense circuit, an opto-coupler circuit, and a control circuit. The control circuit adaptively adjusts an operation signal according to a level of the programmable output voltage, to maintain a same or relatively higher operation frequency of the operation signal when the programmable output voltage switches to a relatively lower level, so as to maintain a phase margin while supplying the same output current.
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公开(公告)号：US20160149497A1
公开(公告)日：2016-05-26
申请号：US14947233
申请日：2015-11-20
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Tzu-Chen Lin
IPC: H02M3/335
CPC classification number: H02M3/33507 , H02M1/15 , H02M7/06 , H02M2001/007
Abstract: A power converter circuit includes a transformer for converting a primary side voltage to a secondary side voltage and generating an output current. A power limit control unit senses the secondary side voltage to obtain a waveform feature of the primary side voltage, and decides a target of the output current according to the waveform feature of the primary side voltage. When the primary side voltage drops to a threshold, the output current is reduced.
Abstract translation: 电力转换器电路包括用于将初级侧电压转换为次级侧电压并产生输出电流的变压器。 功率限制控制单元感测次级侧电压以获得初级侧电压的波形特征，并且根据初级侧电压的波形特征来确定输出电流的目标。 当初级侧电压下降到阈值时，输出电流降低。
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公开(公告)号：US11545909B2
公开(公告)日：2023-01-03
申请号：US17359336
申请日：2021-06-25
Applicant: Richtek Technology Corporation
Inventor： Tzu-Chen Lin
Abstract: A flyback power converter includes: a power transformer, a primary side control circuit, a secondary side control circuit, and an active clamp snubber including a snubber switch and a control signal generation circuit. The control signal generation circuit controls the snubber switch to be conductive during a soft switching period in an OFF period of a primary side switch within a switching period of the switching signal, whereby the primary side switch achieves soft switching. A starting time point of the soft switching period is determined by a current threshold, so that a secondary side current is not lower than the current threshold at the starting time point, whereby the secondary side control circuit keeps the SR switch conductive at the starting time point. The secondary side control circuit turns OFF the SR switch when the secondary side current is lower than the current threshold.
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公开(公告)号：US10181782B2
公开(公告)日：2019-01-15
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
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.
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公开(公告)号：US20180138818A1
公开(公告)日：2018-05-17
申请号：US15809595
申请日：2017-11-10
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Ta-Yung Yang , Tzu-Chen Lin , Bing Zeng , Li-Di Luo
IPC: H02M3/335
CPC classification number: H02M3/33523 , H02M3/33592
Abstract: A flyback power converter includes a transformer, a power switch, a power switch control circuit, a synchronous rectification (SR) switch, an SR switch control circuit, and a signal coupler circuit. The signal coupler circuit includes a primary port and a secondary port, wherein the primary port is electrically connected to the power switch control circuit, and the secondary port is electrically connected to the SR switch control circuit. The primary port and the secondary port receive different signals generated by the power switch control circuit and the SR switch control circuit respectively, and the signal coupler circuit senses and converts the different signals to generate corresponding converted signals at the secondary port and the primary port respectively in different and non-overlapping time periods, without direct contact or direct connection between the primary side and the secondary side of the transformer.
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