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公开(公告)号：US11996778B2
公开(公告)日：2024-05-28
申请号：US17734170
申请日：2022-05-02
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Hui Li , Guangzhuo Li
CPC classification number: H02M3/33515 , H02M1/0003 , H02M1/08
Abstract: A circuit for controlling a switching mode power supply having a power switch, having: a feedback pulse circuit, configured to receive a feedback signal, and to provide a feedback pulse signal; a load determining circuit, configured to receive the feedback signal, and to provide a load determining signal; a light load pulse circuit, configured to receive the load determining signal and a frequency regulating signal, and to provide a light load pulse signal; a frequency regulating circuit, configured to receive the load determining signal, the light load pulse signal and a normal load pulse signal, and to provide the frequency regulating signal; and a selecting circuit, configured to receive the load determining signal, the feedback pulse signal and the light load pulse signal, and to provide an on control signal and the normal load pulse signal; wherein the on control signal controls an on operation of the power switch.
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2.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：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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公开(公告)号：US20250096681A1
公开(公告)日：2025-03-20
申请号：US18762250
申请日：2024-07-02
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Jicheng Wang , Guangzhuo Li
Abstract: A control method for a switching converter with a main switch and a sync switch and converting an AC (alternating current) input voltage into an output voltage. The control method includes the following steps. 1) Determining whether the switching converter works in DCM or CRM. 2) When the switching converter works in CRM, turning off the sync switch when a first time period started from the time when an inductor current decreases to zero expires. 3) Turning on the main switch at a valley of a voltage across the main switch. And 4) turning off the main switch when an on time of the main switch reaches a second time period, where the second time period is related to the first time period.
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公开(公告)号：US12199504B2
公开(公告)日：2025-01-14
申请号：US17986530
申请日：2022-11-14
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Guangzhuo Li , Pengfei Liu , Siran Wang
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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Patent Agency Ranking
6.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：US20240413735A1
公开(公告)日：2024-12-12
申请号：US18733531
申请日：2024-06-04
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Guangzhuo Li
Abstract: A control method for a switching converter. The switching converter has a front stage circuit providing a first output voltage between a first node and a second node, a voltage dividing circuit coupled between the first node and a third node and a current sensing circuit coupled between the third node and the second node. The control method includes the following steps. Receiving a first voltage signal from an output terminal of the voltage dividing circuit. Receiving a second voltage signal from the third node. Generating a voltage sensing signal indicative of the first output voltage based on the first voltage signal and the second voltage signal. And generating a switch control signal to control the front stage circuit based on the voltage sensing signal and the second voltage signal.
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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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9.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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公开(公告)号：US20220368236A1
公开(公告)日：2022-11-17
申请号：US17734170
申请日：2022-05-02
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Hui Li , Guangzhuo Li
Abstract: A circuit for controlling a switching mode power supply having a power switch, having: a feedback pulse circuit, configured to receive a feedback signal, and to provide a feedback pulse signal; a load determining circuit, configured to receive the feedback signal, and to provide a load determining signal; a light load pulse circuit, configured to receive the load determining signal and a frequency regulating signal, and to provide a light load pulse signal; a frequency regulating circuit, configured to receive the load determining signal, the light load pulse signal and a normal load pulse signal, and to provide the frequency regulating signal; and a selecting circuit, configured to receive the load determining signal, the feedback pulse signal and the light load pulse signal, and to provide an on control signal and the normal load pulse signal; wherein the on control signal controls an on operation of the power switch.
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