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公开(公告)号：US20240072649A1
公开(公告)日：2024-02-29
申请号：US18455377
申请日：2023-08-24
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Inventor： Ken CHIN , Feng YANG , Shuaibing WANG
CPC classification number: H02M1/4208 , H02M1/0009
Abstract: This application describes a totem-pole power factor correction circuit and a power supply module. A detection circuit of the totem-pole power factor correction circuit can detect a current between a power transistor and a bridge arm middle point, and determine a current value when an inductor is charged. When a control circuit controls a drive circuit to drive the power transistor to be turned on, in response to a value of a current flowing through the inductor being greater than a first predetermined value, the drive circuit can drive, in time based on a detection result of the detection circuit, the power transistor to be turned off, to protect the power transistor.
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公开(公告)号：US20220385175A1
公开(公告)日：2022-12-01
申请号：US17750645
申请日：2022-05-23
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Ken CHIN , Yuanjun LIU , Zhixiang HU , Shuaibing WANG
Abstract: This application provides a resonant conversion system, including a controller and a resonant conversion circuit. The resonant conversion circuit includes a high frequency chopper circuit, a resonant cavity, a transformer, and a rectification filter network, and the high frequency chopper circuit includes switches S1 and S2. The controller is configured to: detect a bridge arm midpoint voltage VSW, and determine based on the VSW a current threshold signal used to indicate a current threshold; detect a resonant current on a primary side of the transformer, and compare the resonant current with the current threshold signal to control on/off of the switch S1 or S2 based on the second electrical signal, so that the system operates in an inductive mode to ensure zero voltage switching of the switch, while operating in a state close to a capacitive mode to maximize the use of a gain region.
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公开(公告)号：US20240072650A1
公开(公告)日：2024-02-29
申请号：US18455913
申请日：2023-08-25
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Ken CHIN , Shuaibing WANG , Bo WANG
CPC classification number: H02M1/4233 , H02M1/0085 , H02M3/158
Abstract: A power module, a totem-pole power factor correction circuit, and a control circuit thereof. In response to a case in which a phase value of a transient voltage of an input voltage of the totem-pole power factor correction circuit is within a predetermined phase range, and an absolute value of a voltage value is less than a predetermined voltage value, the control circuit controls a main power switch in the totem-pole power factor correction circuit to be turned on and off, and controls an auxiliary power switch to remain off.
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公开(公告)号：US20240014733A1
公开(公告)日：2024-01-11
申请号：US18347040
申请日：2023-07-05
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Ken CHIN , Shanglin MO , Shuaibing WANG
CPC classification number: H02M1/4266 , H02M1/0009 , H02M1/0058 , H02M1/4233
Abstract: A method for controlling a totem-pole PFC circuit. When an alternating current of an input end of a totem-pole PFC circuit is in a positive half period, if a previous switching period is less than specified duration, after charging of a PFC inductor is completed, a switch that enables the PFC inductor to be discharged is first delayed for specified threshold duration, and then the switch that enables the PFC inductor to be discharged is turned on, so that the switch that enables the PFC inductor to be discharged is turned on only once. In an existing PFC application, when an input voltage is in a positive half period, a switch that enables a PFC inductor to be discharged needs to be turned on twice.
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