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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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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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Patent Agency Ranking
公开(公告)号：US20240072647A1
公开(公告)日：2024-02-29
申请号：US18497110
申请日：2023-10-30
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Ken CHIN , Yuanjun LIU , Shanglin MO , Liangyun KANG
Abstract: A power supply apparatus includes a totem-pole power factor correction (PFC) circuit and a control apparatus, and the totem-pole PFC circuit includes a first switching transistor and a second switching transistor. The control apparatus includes a controller and a dead time detection circuit, and the dead time detection circuit includes a detection capacitor and a detection resistor. A first end of the detection capacitor is connected to a first reference point, a second end of the detection capacitor is connected to a first end of the detection resistor, and a second end of the detection resistor is grounded. The controller is configured to, respectively, control an on/off status of the first switching transistor and an on/off status of the second switching transistor based on a voltage of the detection resistor and polarity of a voltage input by an alternating current input source.
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公开(公告)号：US20240088792A1
公开(公告)日：2024-03-14
申请号：US18451178
申请日：2023-08-17
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Liangyun KANG , Ken CHIN , Bo WANG , Baolei DAI
CPC classification number: H02M3/33523 , H02M1/0058 , H02M3/33571
Abstract: A voltage conversion apparatus, a control method, and a power supply device. The voltage conversion apparatus includes a control circuit. The control circuit is configured to: obtain a first sampling voltage and a second sampling voltage; detect a resonant period based on the second sampling voltage when it is determined, based on the first sampling voltage, that a voltage range of an output voltage of the voltage conversion apparatus changes and a voltage threshold is exceeded; and output a drive signal based on the detected resonant period. The drive signal is used to control turn-on and turn-off of a first switching transistor and a second switching transistor.
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公开(公告)号：US20240055982A1
公开(公告)日：2024-02-15
申请号：US18497028
申请日：2023-10-30
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Ken CHIN , Yuanjun LIU , Shanglin MO , Liangyun KANG
CPC classification number: H02M1/4208 , H02M1/0058 , H02M1/0009
Abstract: A power conversion circuit and a power conversion circuit control method. The power conversion circuit determines polarity of an alternating current voltage by using a PFC circuit controller, determines, based on a current of an inductor, a signal for controlling a secondary switch to be turned off, determines, based on a voltage at a midpoint of a series connection between a switching transistor S1 and a switching transistor S2, a signal for controlling the secondary switch to be turned on again and a signal for controlling a primary switch to be turned off, and performs PWM control on the switching transistor S1 and the switching transistor S2.
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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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8.发明申请公开(公告)号：US20220345034A1
公开(公告)日：2022-10-27
申请号：US17728038
申请日：2022-04-25
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Ken CHIN , Shanglin MO , Yuanjun LIU
IPC: H02M1/42
Abstract: The control system includes a PFC circuit and a sampling control circuit, and the PFC circuit includes an inductor, a first power supply drive circuit, and a first bridge arm and a second bridge arm that are connected in parallel, and a first bridge arm midpoint is a serial connection point between a first upper bridge arm and a first lower bridge arm of the first bridge arm. The sampling control circuit is configured to control, based on voltages of two ends of an alternating current power supply, the first lower bridge arm to be turned on, so that the first power supply drive circuit starts charging. The sampling control circuit is further configured to: when charging duration of the first power supply drive circuit reaches first target duration, control the first lower bridge arm to be turned off, so that the first power supply drive circuit completes charging.
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