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公开(公告)号：US11742760B2
公开(公告)日：2023-08-29
申请号：US17520635
申请日：2021-11-06
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
CPC classification number: H02M3/1584 , H02M1/0006 , H02M1/36 , H02M3/01 , H02M3/07
Abstract: A resonant switching power converter includes: a power stage circuit and a driving circuit. The power stage circuit includes: a resonant capacitor, a resonant inductor and switches. The driving circuit includes: drivers for driving the switches; and a power supply circuit for providing driving powers to the drivers. The power supply circuit includes: a voltage booster circuit generating a booster power supply according to a clock signal, a DC voltage and an output related signal; driving capacitors, wherein a voltage across each driving capacitor corresponds to one driving power; and supply diodes, which are coupled in series from the booster power supply along a forward direction of the supply diodes. A backward end of each supply diode is coupled to a positive end of one corresponding driving power, to charge one corresponding driving capacitor, thus generating the corresponding driving power.
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公开(公告)号：US11682966B2
公开(公告)日：2023-06-20
申请号：US17325689
申请日：2021-05-20
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A switched capacitor converter circuit includes: plural capacitors and plural switches which periodically switch the coupling relationships of the plural capacitors. During a first period, the switches control at least two of the capacitors to be electrically connected in series between the first power and the second power, and control a first capacitor of the capacitors to be electrically connected in parallel to the second power. During a second period, the switches control at least two of the capacitors to be electrically connected in series between the second power and a ground voltage level, and control a second capacitor of the capacitors to be electrically connected in parallel with the second power, thereby executing power conversion between the first power and the second power.
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公开(公告)号：US11671002B2
公开(公告)日：2023-06-06
申请号：US17244920
申请日：2021-04-29
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Chung-Lung Pai , Ta-Yung Yang
IPC: H02M1/00 , H02M3/07 , H02M3/158 , H02M3/00 , G01R19/175
CPC classification number: H02M1/0095 , H02M3/01 , H02M3/07 , H02M3/158 , G01R19/175
Abstract: A resonant switching power converter includes: plural capacitors; plural switches; at least one charging inductor; at least one discharging inductor; a controller which generates a charging operation signal and at least one discharging operation signal; and at least one zero current detection circuit which detects a charging resonant current flowing through the charging inductor in a charging process and/or detect a discharging resonant current flowing through the discharging inductor in a discharging process. When detecting that a level of the charging resonant current or a level of the discharging resonant current is zero, the zero current detection circuit generates at least one zero current detection signal which is sent to the controller. The controller determines start time points and end time points of the charging process and the discharging process according to the zero current detection signal. There can be plural discharging processes.
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54.发明授权公开(公告)号：US11646654B2
公开(公告)日：2023-05-09
申请号：US17244933
申请日：2021-04-29
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
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.
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公开(公告)号：US11601048B2
公开(公告)日：2023-03-07
申请号：US17361866
申请日：2021-06-29
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A resonant switching power converter includes: capacitors, switches, at least one charging inductor, at least one discharging inductor and a pre-charging circuit. The pre-charging circuit controls a first switch of the switches when the resonant switching power converter operates in a pre-charging mode, to control an electrical connection relationship between the input voltage and a first capacitor of the capacitors and to control other capacitors of the capacitors, thus controlling the capacitors to be connected in parallel to one another or to be connected in series to one another, so that when a voltage drop across the first capacitor is lower than a predetermined voltage, the voltage drop across each capacitor is charged to the predetermined voltage. After operating in the pre-charging mode, the resonant switching power converter subsequently operates in a resonant voltage conversion mode, to thereby convert an input voltage to an output voltage.
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Patent Agency Ranking
公开(公告)号：US20220368218A1
公开(公告)日：2022-11-17
申请号：US17719568
申请日：2022-04-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
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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公开(公告)号：US20220238727A1
公开(公告)日：2022-07-28
申请号：US17571401
申请日：2022-01-07
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Ting-Wei Liao , Chien-Yu Chen , Kun-Huang Yu , Wu-Te Weng , Chien-Wei Chiu , Ta-Yung Yang
IPC: H01L29/866 , H01L29/78 , H01L29/06 , H01L29/66
Abstract: The present invention provides a Zener diode and a manufacturing method thereof. The Zener diode includes: a semiconductor layer, an N-type region, and a P-type region. The N-type region has N-type conductivity, wherein the N-type region is formed in the semiconductor layer beneath an upper surface of the semiconductor layer, and in contact with the upper surface. The P-type region has P-type conductivity, wherein the P-type region is formed in the semiconductor layer and is completely beneath the N-type region, and in contact with the N-type region. The N-type region overlays the entire P-type region. The N-type region has an N-type conductivity dopant concentration, wherein the N-type conductivity dopant concentration is higher than a P-type conductivity dopant concentration of the P-type region.
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公开(公告)号：US20220166339A1
公开(公告)日：2022-05-26
申请号：US17531792
申请日：2021-11-21
Applicant: Richtek Technology Corporation
Inventor： Wei-Hsu Chang , Ta-Yung Yang
Abstract: A power conversion circuit includes an inductive switching power converter and a capacitive switching power converter. The inductive switching power converter switches an inductor to converter a DC power to a first power. The capacitive switching power converter switches a conversion capacitor to convert the first power to a charging power for charging a battery. The inductive switching power converter and the capacitive switching power converter flexibly operate in and dynamically switch between a regulation mode, a bypass mode or a combination thereof according to a parameter of the DC power.
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公开(公告)号：US20210367511A1
公开(公告)日：2021-11-25
申请号：US17325689
申请日：2021-05-20
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A switched capacitor converter circuit includes: plural capacitors and plural switches which periodically switch the coupling relationships of the plural capacitors. During a first period, the switches control at least two of the capacitors to be electrically connected in series between the first power and the second power, and control a first capacitor of the capacitors to be electrically connected in parallel to the second power. During a second period, the switches control at least two of the capacitors to be electrically connected in series between the second power and a ground voltage level, and control a second capacitor of the capacitors to be electrically connected in parallel with the second power, thereby executing power conversion between the first power and the second power.
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公开(公告)号：US20210143730A1
公开(公告)日：2021-05-13
申请号：US17075576
申请日：2020-10-20
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Kwan-Jen Chu
Abstract: A flyback power converter includes: a transformer, a primary side switch, a snubber capacitor and an active clamp snubber. The snubber capacitor is charged by a leakage inductance current of a primary winding fora snubber period following after a time point when the primary side switch is turned OFF. The active clamp snubber includes a snubber control switch which is connected in series to the snubber capacitor. The series circuit of the snubber control switch and the snubber capacitor is connected in parallel to the primary winding. The leakage inductance current charges the snubber capacitor through the snubber control switch during the snubber period. The snubber capacitor provides a capacitor voltage as electrical power of the active clamp snubber. A voltage level of a reference node between the snubber control switch and the snubber capacitor serves as a snubber ground level of the active clamp snubber.
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