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1.发明公开公开(公告)号：US20230275505A1
公开(公告)日：2023-08-31
申请号：US18155438
申请日：2023-01-17
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Guangzhuo Li , Pengfei Liu , Siran Wang
CPC classification number: H02M1/32 , H02M1/0009 , H02M1/4208
Abstract: An over-current protection circuit has a current sensing circuit, an over-current comparing circuit, an isolation circuit and a control circuit. The current sensing circuit generates a current sensing signal based on a current flowing through an inductor of a voltage converter. The over-current comparing circuit receives the current sensing signal and generates a first over-current indication signal based on the current sensing signal. The isolation circuit receives the first over-current indication signal and generates a second over-current indication signal based on the first over-current indication signal. The control circuit receives the second over-current indication signal, and generates a control signal to control a switch of the voltage converter. The control circuit turns off the switch when the second over-current indication signal indicates that an over-current condition occurs.
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公开(公告)号：US20230223855A1
公开(公告)日：2023-07-13
申请号：US18184202
申请日：2023-03-15
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Siran Wang , Pengfei Liu , Yuzhou Zhang
CPC classification number: H02M3/33569 , H02M3/3376 , H02M1/0009
Abstract: A control circuit for a resonant circuit includes a resonant current detecting circuit, a current adjustment circuit and an on-time control circuit. The resonant current detecting circuit is configured to receive a resonant current, a first reference and a second reference, and to provide a detected current signal based on the resonant current, the first reference and the second reference. The current adjustment circuit is configured to receive the detected current signal and a charging reference, and to provide an on-time control signal based on the detected current signal and the charging reference. The on-time control circuit is configured to receive the on-time control signal and an on-time initial value, and to provide an on-time signal to control a switch of the resonant circuit based on the on-time control signal and the on-time initial value.
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公开(公告)号：US20230058021A1
公开(公告)日：2023-02-23
申请号：US17886110
申请日：2022-08-11
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Pengfei Liu
IPC: H02M1/00
Abstract: A method for controlling a voltage converter includes the following steps. A feedback compensation signal is generated based on an output voltage of the voltage converter. An output representation signal is compared with a first threshold and a second threshold. A switch control signal to control the turn-on and turn-off of a power circuit of the voltage converter is adjusted based on an ultra-light load feedback value when the output representation signal is less than the first power threshold. The switch control signal is adjusted based on the feedback compensation signal when the output representation signal is greater than the first power threshold. The second threshold is greater than the first threshold, and the ultra-light load feedback value is greater than the feedback compensation signal when the output representation signal is equal to the second threshold.
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公开(公告)号：US12244216B2
公开(公告)日：2025-03-04
申请号：US17886110
申请日：2022-08-11
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Pengfei Liu
IPC: H02M1/00
Abstract: A method for controlling a voltage converter includes the following steps. A feedback compensation signal is generated based on an output voltage of the voltage converter. An output representation signal is compared with a first threshold and a second threshold. A switch control signal to control the turn-on and turn-off of a power circuit of the voltage converter is adjusted based on an ultra-light load feedback value when the output representation signal is less than the first power threshold. The switch control signal is adjusted based on the feedback compensation signal when the output representation signal is greater than the first power threshold. The second threshold is greater than the first threshold, and the ultra-light load feedback value is greater than the feedback compensation signal when the output representation signal is equal to the second threshold.
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公开(公告)号：US20240275273A1
公开(公告)日：2024-08-15
申请号：US18645519
申请日：2024-04-25
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Guangzhuo Li , Jicheng Wang , Pengfei Liu , Hao Wang , Chuanhao Xu
CPC classification number: H02M1/4208 , H02M3/155 , H02M7/155
Abstract: A control circuit for controlling a PFC circuit is disclosed. The PFC circuit is controlled to operate in at least two working modes including CCM, BCM, and DCM in a single cycle of an input rectified voltage based on a load of the PFC circuit. The control circuit includes a control reference circuit and a switching control circuit. The control reference circuit provides a parameter control data based on a mode threshold and a half-sine wave signal. The switching control circuit provides a switching control signal to control a main power switch of the PFC circuit based on a current sense signal and the parameter control data. The current sense signal is indicative of a current flowing through an energy storage device of the PFC circuit.
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Patent Agency Ranking
公开(公告)号：US20220166327A1
公开(公告)日：2022-05-26
申请号：US17501316
申请日：2021-10-14
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Pengfei Liu
Abstract: A controller used in a resonant converter having a switching circuit and a resonant tank. The switching circuit has a high side switch and a low side switch. The controller has a feedback processing circuit for providing a reference signal based on a feedback signal. The reference signal changes at a first slope based on the feedback signal when the feedback signal is higher than a first voltage threshold, and the reference signal changes at a second slope based on the feedback signal when the feedback signal is lower than the first voltage threshold. The turning off of the high side switch is controlled by a high side off signal, which is generated based on the reference signal and a voltage sampling signal indicative a voltage across a resonant capacitor of the resonant tank.
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7.发明申请公开(公告)号：US20250070651A1
公开(公告)日：2025-02-27
申请号：US18743856
申请日：2024-06-14
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Guangzhuo Li , Pengfei Liu
IPC: H02M1/42
Abstract: A control circuit for a totem pole PFC circuit with a low side power switch coupled between a switching node and a reference ground. The control circuit includes fourth pins. The first pin is coupled to the switching node. The second pin is coupled to the switching node through a first unidirectional device. The third pin is coupled to a control terminal of the low side power switch. The fourth pin is configured to be coupled to the reference ground. The control circuit is configured to control the turning-off of the low side power switch based on a first voltage indicative of a drain-source voltage of the low side power switch.
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公开(公告)号：US20240348147A1
公开(公告)日：2024-10-17
申请号：US18633956
申请日：2024-04-12
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Guangzhuo Li , Pengfei Liu
CPC classification number: H02M1/08 , H02M1/0025 , H02M1/0032
Abstract: A controller for a switching converter converting an AC input voltage into an output voltage. The controller includes a light load determining circuit, a voltage comparing circuit, a window generator and a switch control circuit. The light load determining circuit generates a light load determining signal indicating whether the switching converter operates in a light load mode. The voltage comparing circuit compares a first feedback voltage signal indicative of the output voltage with a first and a second reference voltage signals respectively to generate a first square wave signal. The window generator generates a second square wave signal based on a second feedback voltage signal indicative of the AC input voltage. The switch control circuit generates a switch control signal to control the power operation of the switching converter based on the light load determining signal, the first square wave signal and the second square wave signal.
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公开(公告)号：US20240055983A1
公开(公告)日：2024-02-15
申请号：US18487362
申请日：2023-10-16
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Pengfei Liu , Hao Wang , Chuanhao Xu
CPC classification number: H02M1/4225 , H02M1/0009
Abstract: A power factor control circuit for controlling a PFC circuit is disclosed. The PFC circuit is controlled to operate in one or more operation mode(s) (e.g., CCM, BCM, and DCM) in a single cycle of an input rectified voltage based on a load condition of the PFC circuit. The power factor control circuit includes a control reference circuit and a switching control circuit. The control reference circuit provides a peak current signal, a valley current signal and a turn-on delay signal based on a first current reference, a second current reference, and an input average current. The switching control circuit provides a switching control signal to control a dominant power switch of the PFC circuit based on a current sense signal, the peak current signal, the valley current signal, and the turn-on delay signal.
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10.发明公开公开(公告)号：US20230163679A1
公开(公告)日：2023-05-25
申请号：US17986530
申请日：2022-11-14
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Guangzhuo Li , Pengfei Liu , Siran Wang
CPC classification number: H02M1/4208 , H02M1/0009 , H02M1/0025
Abstract: A totem pole PFC (Power Factor Correction) circuit, having: a first switch, a second switch and a control circuit. When the totem pole PFC circuit works in CCM (Continuous Current Mode), the control circuit is configured to turn on a main switch when a current detecting signal indicative of an AC input current of the totem pole PFC circuit decreases to a current valley reference signal, and keep the main switch ON for a first on-time period. When the totem pole PFC circuit works in DCM (Discontinuous Current Mode), the control circuit is configured to turn on the main switch at a valley of a switching voltage after expiry of a time delay started from when the AC input current decreases to zero, and keep the main switch ON for a second on-time period.
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