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公开(公告)号：US12170486B2
公开(公告)日：2024-12-17
申请号：US17875828
申请日：2022-07-28
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Hui Li , Siran Wang
Abstract: A method for controlling a switching mode power supply is disclosed. An auxiliary winding feedback voltage of the switching mode power supply is sampled and held to obtain an auxiliary winding sample hold voltage. The auxiliary winding feedback voltage is sampled and held at an inflection point time to obtain an auxiliary winding inflection point voltage when the switching mode power supply operates in DCM or CRM. A secondary rectifier forward voltage signal is generated based on the auxiliary winding sample hold voltage and the auxiliary winding inflection point voltage before the switching mode power supply operates in CCM. A correction voltage is provided based on the secondary rectifier forward voltage signal when the switching power supply operates in CCM. An error amplifier signal is generated based on the correction voltage. The output power of the switching mode power supply is adjusted based on the error amplifier signal.
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公开(公告)号：US11722068B2
公开(公告)日：2023-08-08
申请号：US17546805
申请日：2021-12-09
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Hui Li , Siran Wang , Lin Feng
CPC classification number: H02M3/33592 , H02M1/38 , H02M3/01 , H02M1/0058 , H02M3/33523
Abstract: A controller of an isolated switching converter having a primary and secondary switch, the controller includes a valley detection circuit for providing a valley pulse signal in response to valleys of a resonant voltage, a pulse frequency modulation circuit for providing a pulse frequency modulation signal based on a feedback signal indicative of an output voltage, a primary on enable circuit for providing a primary on enable signal based on the pulse frequency modulation signal and valley pulse signal, a secondary logic circuit for generating a secondary control signal to control the secondary switch based on a primary off detection signal, a zero cross detection signal and the primary on enable signal, and a primary logic circuit for generating a primary control signal to control the primary switch based on a synchronous signal electrically isolated from the primary on enable signal.
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公开(公告)号：US20230238889A1
公开(公告)日：2023-07-27
申请号：US18076608
申请日：2022-12-07
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Hui Li , Siran Wang
CPC classification number: H02M3/33507 , H02M1/36 , H02M1/08
Abstract: A power supply control circuit for controlling a charging process of a power supply capacitor to produce a power supply voltage to power a power control chip is disclosed. The power supply control circuit has a charging switch controlled by a charging control signal, and the power supply capacitor is coupled to an input voltage when the charging switch is on. The power supply control circuit further has a charging control circuit, configured to provide the charging control signal to control the charging switch based on the input voltage, the power supply voltage and a voltage threshold. Thus a high turns ratio of an auxiliary winding to a secondary winding is not necessary, high voltage devices are not needed and the power dissipation caused by the high voltage is also reduced.
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公开(公告)号：US20230034190A1
公开(公告)日：2023-02-02
申请号：US17875828
申请日：2022-07-28
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Hui Li , Siran Wang
IPC: H02M1/00
Abstract: A method for controlling a switching mode power supply is disclosed. An auxiliary winding feedback voltage of the switching mode power supply is sampled and held to obtain an auxiliary winding sample hold voltage. The auxiliary winding feedback voltage is sampled and held at an inflection point time to obtain an auxiliary winding inflection point voltage when the switching mode power supply operates in DCM or CRM. A secondary rectifier forward voltage signal is generated based on the auxiliary winding sample hold voltage and the auxiliary winding inflection point voltage before the switching mode power supply operates in CCM. A correction voltage is provided based on the secondary rectifier forward voltage signal when the switching power supply operates in CCM. An error amplifier signal is generated based on the correction voltage. The output power of the switching mode power supply is adjusted based on the error amplifier signal.
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公开(公告)号：US20220209676A1
公开(公告)日：2022-06-30
申请号：US17546805
申请日：2021-12-09
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Hui Li , Siran Wang , Lin Feng
Abstract: A controller of an isolated switching converter having a primary and secondary switch, the controller includes a valley detection circuit for providing a valley pulse signal in response to valleys of a resonant voltage, a pulse frequency modulation circuit for providing a pulse frequency modulation signal based on a feedback signal indicative of an output voltage, a primary on enable circuit for providing a primary on enable signal based on the pulse frequency modulation signal and valley pulse signal, a secondary logic circuit for generating a secondary control signal to control the secondary switch based on a primary off detection signal, a zero cross detection signal and the primary on enable signal, and a primary logic circuit for generating a primary control signal to control the primary switch based on a synchronous signal electrically isolated from the primary on enable signal.
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Patent Agency Ranking
公开(公告)号：US20220209665A1
公开(公告)日：2022-06-30
申请号：US17546921
申请日：2021-12-09
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Hui Li , Siran Wang
Abstract: A controller of a switching converter includes an error amplifying circuit, a first comparison circuit, a valley detection circuit, a valley selection circuit and a frequency control circuit. The error amplifying circuit generates a compensation signal based on the difference between a reference signal and a feedback signal. The first comparison circuit compares the compensation signal with a modulation signal and generates a pulse frequency modulation signal. The valley detection circuit detects valleys of a resonant voltage of the switching converter and generates a valley pulse signal. The valley selection circuit generates a valley enable signal corresponding to a target valley number based on the pulse frequency modulation signal and the valley pulse signal. The frequency control circuit generates a frequency control signal to control the switching frequency of the first switch based on the valley enable signal and the valley pulse signal.
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公开(公告)号：US20250105749A1
公开(公告)日：2025-03-27
申请号：US18898443
申请日：2024-09-26
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Hui Li
Abstract: The multi-converter power supply has a first port, a second port, a second switching converter, one or more additional switching converters and an integrated control circuit. The first switching converter receives an input voltage and to convert the input voltage into a first output voltage. The second switching converter receives the input voltage and converts the input voltage into a second output voltage. The one or more additional switching converters are selectively activated. The integrated control circuit comprises a first pin, a second pin, one or more output pins, a load condition detect unit, a first switching control unit, a first power distribution control unit and a second power distribution control unit.
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公开(公告)号：US20250105748A1
公开(公告)日：2025-03-27
申请号：US18898435
申请日：2024-09-26
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Hui Li
Abstract: A multi-converter switching power supply has a first switching converter, a second switching converter, a first port, a second port, and an integrated control circuit. The first switching converter receives an input voltage, converts the input voltage to a first output voltage, provides the first output voltage to a first output terminal and a second output terminal. The second switching converter receives the input voltage, converts the input voltage to a second output voltage, and provides the second output voltage to a third output terminal and a fourth output terminal. The second output terminal is coupled to the fourth output terminal. The first port has a first bus terminal for receiving a first voltage and a first ground terminal coupled to the second output terminal. The second port has a second bus terminal for receiving a second voltage and a second ground terminal coupled to the fourth output terminal.
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公开(公告)号：US12249907B2
公开(公告)日：2025-03-11
申请号：US17983544
申请日：2022-11-09
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Shuai Wang , Hui Li
Abstract: A noise control circuit of a switching mode power supply is disclosed. The switching mode power supply has a primary switch, a secondary switch and a transformer with a primary winding and a secondary winding. The noise control circuit includes a reverse noise generating circuit having a first input terminal coupled to a first pulse terminal or a second pulse terminal of the primary switch, a second input terminal configured to receive an adjusting signal, and an output terminal configured to provide a noise control signal. The secondary winding has a first terminal and a second terminal. The noise control signal is coupled to either terminal of the secondary winding of the transformer.
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公开(公告)号：US20240235401A1
公开(公告)日：2024-07-11
申请号：US18614100
申请日：2024-03-22
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Qiaoan Zuo , Bin Xiao , Hui Li , Guangzhou Li
CPC classification number: H02M3/33515 , H02M1/0032
Abstract: A circuit for controlling a switching mode power supply having a power switch. The switching mode power supply includes a power switch. The control circuit includes a feedback pulse circuit, and a light load pulse circuit. When the load of the switching mode power supply is above a certain load level, the feedback pulse circuit provides a feedback pulse signal to control the power switch operating at a frequency which increases as a load of the switching mode power supply increases. When the load of the switching mode power supply is under the certain load level, the light load pulse circuit provides a light load pulse signal to control the power switch operating at different switching frequencies wherein the different switching frequencies includes at least two switching frequencies.
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