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公开(公告)号：US20240275275A1
公开(公告)日：2024-08-15
申请号：US18168580
申请日：2023-02-14
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Yu-Chang Chen , Hsin-Yi Wu , Kun-Yu Lin
CPC classification number: H02M3/01 , H02M1/083 , H02M1/32 , H02M3/33571 , H02M3/33592
Abstract: A resonant asymmetrical half-bridge flyback power converter includes: a first transistor and a second transistor switching a transformer coupled to a capacitor for generating an output power; a voltage divider coupled to an auxiliary winding of the transformer; a differential sensing circuit which includes a first terminal and a second terminal coupled to the voltage divider to sense an auxiliary signal generated by the auxiliary winding for generating a peak signal and a demagnetization-time signal; and a PWM control circuit configured to generate a first PWM signal and a second PWM signal in accordance with the peak signal and the demagnetization-time signal, for controlling the first transistor and the second transistor respectively; wherein a period of an enabling state of the demagnetization-time signal is correlated to the output power level; wherein the peak signal is related to a quasi-resonance of the transformer after the transformer is demagnetized.
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公开(公告)号：US20240235370A1
公开(公告)日：2024-07-11
申请号：US18486261
申请日：2023-10-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
CPC classification number: H02M1/088 , H02M3/1584
Abstract: A multi-phase switching converter, includes: plural sub-switching converters; and a control circuit. Plural switching signals operate a capacitor of one of the plural sub-switching converters and a capacitor of another one of the plural sub-switching converters, to conduct a switched capacitor switching on a first voltage, thus switching an inductor switching node in each sub-switching converter between a divided voltage of the first voltage and a reference potential and to thereby execute a power conversion between the first voltage and a second voltage. When the inductors of each of the plural sub-switching converters are coupled with one another in a non-electromagnetic fashion, the multi-phase switching converters operate in a non-resonant mode. When the inductors of at least two of the plural sub-switching converters are electromagnetically coupled with one another, the multi-phase switching converters operate in a resonant mode or in the non-resonant mode.
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103.发明公开公开(公告)号：US20240223093A1
公开(公告)日：2024-07-04
申请号：US18436023
申请日：2024-02-08
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Ying-Chieh Su , Yu-Chang Chen
CPC classification number: H02M3/33571 , H02M1/0058 , H02M1/083 , H02M3/33592 , H02M1/0009
Abstract: A resonant half-bridge flyback power converter includes: a first transistor and a second transistor which form a half-bridge circuit; a transformer and a resonant capacitor connected in series and coupled to the half-bridge circuit; and a switching control circuit configured to generate a first driving signal and a second driving signal to control the first transistor and the second transistor respectively for switching the transformer to generate an output voltage. The first driving signal is configured to magnetize the transformer. The second driving signal includes at most one pulse between two consecutive pulses of the first driving signal. The switching control circuit generates a skipping cycle period when an output power is lower than a predetermined threshold. A resonant pulse of the second driving signal is skipped during the skipping cycle period. The skipping cycle period is increased in response to the decrease of the output power.
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公开(公告)号：US12009753B2
公开(公告)日：2024-06-11
申请号：US17673298
申请日：2022-02-16
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Ying-Chieh Su , Yu-Chang Chen
CPC classification number: H02M3/33571 , H02M1/0058 , H02M1/083 , H02M3/33592 , H02M1/0009
Abstract: A half-bridge flyback power converter: a first transistor, a second transistor and a third transistor which form a half-bridge circuit. The first transistor is turned on for generating a negative circulated current for achieving zero voltage switching of the second transistor. The second transistor is turned on for magnetizing a transformer. The third transistor is turned on during a demagnetized time period to generate an output voltage. The physical size of the first transistor is smaller than physical size of the third transistor.
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105.发明公开公开(公告)号：US20240146205A1
公开(公告)日：2024-05-02
申请号：US18473221
申请日：2023-09-23
Applicant: Richtek Technology Corporation
Inventor： Shin-Li Lin , He-Yi Shu , Shih-Jen Yang , Ta-Yung Yang , Yi-Min Shiu , Chih-Ching Lee , Yu-Chieh Hsieh , Chao-Chi Chen
CPC classification number: H02M3/33592 , H02M1/0032 , H02M1/0045
Abstract: A flyback power converter includes a power transformer, a first lossless voltage conversion circuit, a first low-dropout linear regulator and a secondary side power supply circuit. The first low-dropout linear regulator (LDO) generates a first operation voltage as power supply for being supplied to a sub-operation circuit. The secondary side power supply circuit includes a second lossless voltage conversion circuit and a second LDO. The second LDO generates a second operation voltage. The first operation voltage and the second operation voltage are shunted to a common node. When a first lossless conversion voltage is greater than a first threshold voltage, the second LDO is enabled to generate the second operation voltage to replace the first operation voltage as power supply supplied to the sub-operation circuit; wherein the second lossless conversion voltage is lower than the first lossless switching voltage.
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Patent Agency Ranking
公开(公告)号：US20240120845A1
公开(公告)日：2024-04-11
申请号：US18300458
申请日：2023-04-14
Applicant: Richtek Technology Corporation
Inventor： Yu-Chang Chen , Ta-Yung Yang , Kun-Yu Lin , Hsin-Yi Wu
CPC classification number: H02M3/33571 , H02M1/083 , H02M3/01 , H02M3/33592
Abstract: A resonant flyback power converter includes: a first transistor and a second transistor which are configured to switch a transformer and a resonant capacitor for generating an output voltage; and a switching control circuit generating first and second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal magnetizes the transformer. The second driving signal includes a resonant pulse having a resonant pulse width and a ZVS pulse during the DCM operation. The resonant pulse is configured to demagnetize the transformer. The resonant pulse has a first minimum resonant period for a first level of the output load and a second minimum resonant period for a second level of the output load. The first level is higher than the second level and the second minimum resonant period is shorter than the first minimum resonant period.
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公开(公告)号：US11955884B2
公开(公告)日：2024-04-09
申请号：US17719568
申请日：2022-04-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
CPC classification number: H02M3/07 , H02M1/36 , H02M3/01 , H02M3/158 , H02M1/0095
Abstract: A resonant switching power converter circuit including: a switching converter, a control circuit and a pre-charging circuit; wherein the control circuit controls a first switch of the switching converter in a pre-charging mode, so as to control electrical connections between a first power and at least one of plural capacitors of the switching converter, and to control other switches of the switching converter, so as to control the pre-charging circuit to charge at least one capacitor to a predetermined voltage; wherein in a start-up mode, the plural switches control electrical connections of the capacitors according to first and second operation signals, such that after the pre-charging mode ends, the switching converter subsequently operates in the start-up mode; wherein in the start-up mode, the first and second operation signals have respective ON periods, and the time lengths of the ON periods increase gradually.
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108.发明公开公开(公告)号：US20230396162A1
公开(公告)日：2023-12-07
申请号：US18312512
申请日：2023-05-04
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Wei-Hsu Chang
CPC classification number: H02M3/07 , H02M1/0009
Abstract: A switched capacitor voltage converter circuit for converting a first voltage to a second voltage includes: an output capacitor; a switched capacitor converter; and a control circuit. The switched capacitor converter includes: a switch circuit including fourth switches; an inductor coupled between the switch circuit and the output capacitor; and a flying capacitor coupled to the switch circuit, wherein the flying capacitor and the output capacitor constitute a voltage divider. The control circuit generates a PWM signal according to the second voltage and generates switch signals according to the PWM signal to control the switch circuit, so as to convert the first voltage to the second voltage. The control circuit decides whether the switched capacitor converter operates in a boundary conduction mode, a discontinuous conduction mode or a continuous conduction mode according to an output current or an output current related signal.
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公开(公告)号：US20230268825A1
公开(公告)日：2023-08-24
申请号：US18156453
申请日：2023-01-19
Applicant: Richtek Technology Corporation
Inventor： Wei-Hsu Chang , Ta-Yung Yang , Shih-Ho Hsu , Mao-Hui Kuo
CPC classification number: H02M1/42 , H02M1/08 , H02M3/33571 , H02M3/33573
Abstract: A power supply system includes a power factor correction converter circuit and an isolated power converter circuit, wherein the power factor correction converter circuit corrects the power factor of a rectified power to generate a first output power, and the isolated power converter circuit converts the first output power to generate a second output power. The isolated power converter circuit includes a transformer, and the transformer includes a primary winding, a secondary winding, and an auxiliary winding. The auxiliary winding generates an auxiliary voltage which is related to the second output power. When the auxiliary voltage is lower than a disabled threshold, indicating that the voltage of the second output power is lower than a threshold, the power factor correction converter circuit provides a bypassing connection from the rectified power to the first output power and stops correcting the power factor of the rectified power.
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公开(公告)号：US20230238875A1
公开(公告)日：2023-07-27
申请号：US17892085
申请日：2022-08-21
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Wei-Chuan Wu , Chih-Hao Yang , Ping-Ching Huang , Li-Wen Fang
CPC classification number: H02M1/084 , H02M1/0041 , H02M1/0043 , H02M3/158
Abstract: A control circuit for controlling a stackable multiphase power converter includes: a synchronization terminal; a synchronization signal connected to the synchronization terminals of a plurality of the control circuits in parallel, wherein the synchronization signal includes a plurality of pulses to be successively counted as a count number; and a reset signal, configured to reset and initiate the count number; wherein the control circuit further comprises a phase-sequence number, wherein the control circuit enables a corresponding power stage circuit to generate a phase of the output power when the count number reaches the phase-sequence number.
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