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21.发明授权公开(公告)号：US12176811B2
公开(公告)日：2024-12-24
申请号：US18300266
申请日：2023-04-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
Abstract: A switched capacitor voltage converter circuit includes: a switched capacitor converter and a control circuit. The switched capacitor converter includes at least one resonant capacitor, switches and at least one inductor. The control circuit generates a pulse width modulation (PWM) signal according to a first voltage or a second voltage and generates a control signal according to the PWM signal and a zero current detection signal. The control signal controls the switched capacitor converter by operating the corresponding switches to switch electrical connection of the inductor, so as to convert the first voltage to the second voltage or convert the second voltage to the first voltage.
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公开(公告)号：US20240405683A1
公开(公告)日：2024-12-05
申请号：US18595467
申请日：2024-03-05
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
Abstract: A multi-level switching converter circuit for converting a first voltage to a second voltage or convert the second voltage to the first voltage, includes: a power stage circuit and a control circuit. Through a valley current mode control, the conversion control circuit generates a first ramp signal to determine a first duty ratio of the first control signal, and generates a second ramp signal to determine a second duty ratio of the second control signal, thereby a switching node connected to one end of an inductor is switched between two of k levels of voltages, such that the first voltage or the second voltage is regulated to a predetermined target level, and a flying capacitor voltage across the flying capacitor is regulated and balanced at one (k-1)th of the first voltage.
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23.发明授权公开(公告)号：US12136885B2
公开(公告)日：2024-11-05
申请号：US18436023
申请日：2024-02-08
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Ying-Chieh Su , Yu-Chang Chen
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：US12062974B2
公开(公告)日：2024-08-13
申请号：US17716933
申请日：2022-04-08
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Yu-Chang Chen
CPC classification number: H02M1/0006 , H02M3/07 , H02M3/33523
Abstract: A switched capacitor converter circuit includes: a conversion capacitor; an output capacitor; and switches configured to switch the coupling configurations of the conversion capacitor and the output capacitor according to a level of the first power supply voltage of the switched capacitor converter circuit, to generate the second power supply voltage at the output capacitor according to the first power supply voltage. The second power supply voltage provides power to control the power converter circuit. When the first power supply voltage is higher than a high threshold, the switched capacitor converter circuit controls the second power supply voltage to be lower than the first power supply voltage. When the first power supply voltage is lower than a low threshold, the switched capacitor converter circuit controls the second power supply voltage to be higher than the first power supply voltage.
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公开(公告)号：US12027966B2
公开(公告)日：2024-07-02
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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Patent Agency Ranking
公开(公告)号：US20240128876A1
公开(公告)日：2024-04-18
申请号：US18335195
申请日：2023-06-15
Applicant: Richtek Technology Corporation
Inventor： Yu-Chang Chen , Ta-Yung Yang , Kun-Yu Lin , Fu-Ciao Syu , Chia-Hsien Yang , Hsin-Yi Wu
CPC classification number: H02M3/33507 , H02M1/083
Abstract: A switching control circuit for use in controlling a resonant flyback power converter generates a first driving signal and a second driving signal. The first driving signal is configured to turn on the first transistor to generate a first current to magnetize a transformer and charge a resonant capacitor. The transformer and charge a resonant capacitor are connected in series. The second driving signal is configured to turn on the second transistor to generate a second current to discharge the resonant capacitor. During a power-on period of the resonant flyback power converter, the second driving signal includes a plurality of short-pulses configured to turn on the second transistor for discharging the resonant capacitor. A pulse-width of the short-pulses of the second driving signal is short to an extent that the second current does not exceed a current limit threshold.
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27.发明授权公开(公告)号：US11962247B2
公开(公告)日：2024-04-16
申请号：US17673062
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 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：US11843321B2
公开(公告)日：2023-12-12
申请号：US17534538
申请日：2021-11-24
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Ta-Yung Yang , Wei-Hsu Chang , Yu-Chang Chen , Tsung-Wei Huang , Shui-Mu Lin
CPC classification number: H02M3/33592 , H02M1/08
Abstract: A control circuit for controlling a power supply circuit to provide power to a system device which includes a communication circuit includes: a pulse width modulation (PWM) controller configured to switch a transformer of the power supply circuit to generate a first output voltage; and a switched capacitor converter configured to generate a second output voltage according to the first output voltage. The second output voltage provides power to the communication circuit, wherein the communication circuit generates a power saving signal to control the PWM controller and the switched capacitor converter. When the power saving signal is enabled, the first output voltage is decreased and a duty ratio of the switched capacitor converter is increased.
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29.发明公开公开(公告)号：US20230246548A1
公开(公告)日：2023-08-03
申请号：US18149112
申请日：2023-01-01
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Wei-Hsu Chang
CPC classification number: H02M3/07 , H02M1/08 , H02M1/0009
Abstract: A switched capacitor voltage converter circuit for converting a first voltage to a second voltage, includes: a switched capacitor converter and a control circuit. The switched capacitor converter includes at least two capacitors, plural switches and at least one inductor. In a mode switching period wherein the switched capacitor converter switches from a present conversion mode to a next conversion mode, at least two forward switches of the plural switches operate in a unidirectional conduction mode. Each of the forward switches provides a current channel that unidirectionally flows toward the second voltage in the unidirectional conduction mode. The switched capacitor voltage converter circuit is also operable to convert the second voltage to the first voltage.
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公开(公告)号：US20230223843A1
公开(公告)日：2023-07-13
申请号：US18065205
申请日：2022-12-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
CPC classification number: H02M3/07 , H02M1/0058 , H02M3/158
Abstract: A switched capacitor voltage converter circuit includes: a switched capacitor converter, a control circuit and a zero current estimation circuit. The switched capacitor converter includes at least one resonant capacitor, switches and at least one inductor. The zero current estimation circuit is coupled to the at least one inductor and/or the at least one resonant capacitor, for estimating a time point at which a first resonant current is zero during a first process and/or a time point at which a second resonant current is zero during a second process according to a voltage difference between two ends of the inductor, and/or a voltage difference between two ends of the resonant capacitor, to a generate a zero current estimation signal accordingly for generating the operation signal.
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