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公开(公告)号：US20250167687A1
公开(公告)日：2025-05-22
申请号：US18953063
申请日：2024-11-20
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Junlin Qian , Yuedong Chen
Abstract: A controller for a switching converter with a power switch includes a gate driver, a first transistor, and a regulator. The gate driver and provides a drive voltage to control the power switch based on a switch control signal. The first transistor is coupled between a first power supply node and a power supply terminal of the gate driver. A current sense signal representative of a current flowing through the power switch is provided to a floating node in response to the switch control signal being a first level, and the floating node is coupled to a reference ground in response to the switch control signal being a second level. A gate voltage of the first transistor is adjusted by the regulator coupled to the floating node based on a float reference voltage and a feedback voltage provided by a feedback stage.
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公开(公告)号：US20250007383A1
公开(公告)日：2025-01-02
申请号：US18754999
申请日：2024-06-26
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Yuedong Chen , Junlin Qian
Abstract: A control circuit for controlling a power supply voltage of an integrated circuit is provided. The control circuit includes a charging current source. The charging current source receives an input voltage and provides a charging current to a power supply capacitor for generating the power supply voltage. The charging current source starts providing the charging current for charging the power supply capacitor when the input voltage decreases to a charging start threshold voltage and stops providing the charging current when the power supply voltage increases to a charging stop reference voltage. The charging start threshold voltage is adjusted to get a continuous time duration of providing the charging current to be substantially symmetric with respect to a minimum value of the input voltage.
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公开(公告)号：US11909325B2
公开(公告)日：2024-02-20
申请号：US17521000
申请日：2021-11-08
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Yuedong Chen
CPC classification number: H02M3/33592 , H02M1/08 , H02M1/0025
Abstract: A synchronous rectifier control circuit, used with a synchronous rectification circuit having a primary switch and a synchronous rectifier, having: a drain-source threshold setting circuit, configured to provide a dynamic drain-source voltage threshold based on a drain-source voltage across the synchronous rectifier; a primary switch detecting circuit, configured to provide a primary switch state indicating signal based on a comparison result of the drain-source voltage and the dynamic drain-source voltage threshold; and an on-control circuit, configured to provide a synchronous on signal to turn on the synchronous rectifier when the drain-source voltage decreases to the turn-on threshold, on the premise that the primary switch state indicating signal indicates an on state of the primary switch.
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公开(公告)号：US11563374B2
公开(公告)日：2023-01-24
申请号：US16928257
申请日：2020-07-14
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Yuedong Chen
Abstract: A switching mode power supply preventing a first switch from being falsely triggered. The switching mode power supply detects a peak of an input signal and starts timing a period of time since the arrival of the peak of the input signal is detected. The first switch starts performing the on and off switching operations when the period of time expires.
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5.发明授权公开(公告)号：US11239743B2
公开(公告)日：2022-02-01
申请号：US16943384
申请日：2020-07-30
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Yuedong Chen , Yiqing Jin , Zhiheng Hu
Abstract: A switching mode power supply preventing false triggering of an over current protection due to a surge pulse. The switching mode power supply has a switch and an inductor. An inductor current flows through the inductor. The switching mode power supply turns off the switch and meanwhile starts timing for a preset period of time when the inductor current is larger than a preset value. The switch is kept off during the preset period of time and is then turned on when the preset period of time expires.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20200212813A1
公开(公告)日：2020-07-02
申请号：US16721181
申请日：2019-12-19
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Yuedong Chen , Haishi Wang , Lin Feng
Abstract: A control circuit having power limit for controlling an AC-DC voltage converter. The control circuit includes a first sensing circuit having an auxiliary winding used to sense a voltage on an inductive element of the converter to generate a first sensing signal, a second sensing circuit used to sense the current flowing through the inductive element to provide a second sensing signal, and a power limit circuit. The power limit circuit generates a power indication signal indicative of the input power of the converter based on the first sensing signal and the second sensing signal. When the power indication signal is larger than a power threshold, a controllable switch of the converter is turned off.
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7.发明申请公开(公告)号：US20180034380A1
公开(公告)日：2018-02-01
申请号：US15665354
申请日：2017-07-31
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Yuedong Chen
CPC classification number: H02M3/33523 , H02M1/32 , H02M1/36 , H02M1/4258 , H02M2001/0006 , Y02B70/126
Abstract: An integrated circuit used for a switching converter has a power supply circuit for providing a power supply voltage, and a control circuit. The switching converter has a switching circuit converting a DC input voltage into an output signal. The power supply circuit has a protection circuit, an UVLO unit and a current source coupled to a power supply capacitor. The protection circuit detects whether the DC input voltage is at a brown-in state. The UVLO unit generates a lock out signal by comparing the power supply voltage with a upper threshold voltage and a lower threshold voltage. The lower threshold voltage is selectively limited to one of a first value or a second value based on the detection. The second value is less than the first value. The current source provides the power supply voltage under the control of the lock out signal.
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公开(公告)号：US20240322667A1
公开(公告)日：2024-09-26
申请号：US18605473
申请日：2024-03-14
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Yuedong Chen , Jiangwei Cheng
CPC classification number: H02M1/0058 , H02M1/0009 , H02M3/33571
Abstract: A control circuit for a power converter. The control circuit may provide a first switch driving signal and a second switch driving signal that may be respectively used to control a first power switch and a second power switch. The control circuit may change the second switch driving signal from a second driving reset logic state to a second driving set logic state after a dead time expires since a moment when the first switch driving signal is changed from a first driving set logic state to a first driving reset logic state. The control circuit may further adaptively adjust the dead time to vary in a same direction as a capacitance parameter of the first power switch and a capacitance parameter of the second power switch vary.
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公开(公告)号：US11476749B2
公开(公告)日：2022-10-18
申请号：US17354505
申请日：2021-06-22
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Yuedong Chen
Abstract: A switching mode power supply with an adaptive setting of a threshold valley voltage. The switching mode power supply decreases a reference auxiliary current when a valley value of a primary switching voltage across a primary switch is smaller than a first threshold valley voltage. And in addition, the switching mode power supply can increase the reference auxiliary current when the valley value of the primary switching voltage is larger than a second threshold valley voltage.
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公开(公告)号：US11245327B2
公开(公告)日：2022-02-08
申请号：US16851057
申请日：2020-04-16
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Lin Feng , Yuedong Chen
Abstract: A driving circuit for driving a synchronous rectifier device. The driving circuit may include a controllable clamping circuit having a first terminal coupled to a sensing terminal of the driving circuit, a second terminal coupled to a reference ground terminal of the driving circuit, a third terminal coupled to a driving terminal of the driving circuit, and a control terminal configured to receive a supply indication signal indicative of a voltage potential at a supply terminal of the driving circuit. The third terminal of the controllable clamping circuit may be connected to the second terminal of the controllable clamping circuit when the supply indication signal indicates that the voltage potential at the supply terminal has not been established to maintain the synchronous rectifier device off.
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