Huawei Digital Power Technologies Co., Ltd.

Huawei Technologies Co., Limited

Shuaibing Wang

Ken Chin

Shanglin Mo

Jian Mg Cheng

Xia Zhu

Naiqiang Qiao

Yuanjun Liu

Zhixiang Hu

Jiyu Pan

Liangyun Kang

Zuqing Li

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.

Method and apparatus for controlling totem-pole PFC circuit, and electronic device

A noise suppression method and apparatus for a totem pole power factor correction (PFC) circuit and an electronic device are provided. In response to a determination that an alternating current of the totem pole PFC circuit is switched at a zero crossing, a control signal is sent to a switch that enables a PFC inductor in the totem pole PFC circuit to charge or discharge. After the switch is turned off for a first period of time, the switch is turned on again for a second period of time.

Noise suppression method and apparatus for totem pole PFC circuit, and electronic device

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 Sand S. The controller is configured to: detect a bridge arm midpoint voltage V, and determine based on the Va 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 Sor Sbased 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.

Resonant conversion system and control method

In the method, a detection agent apparatus receives location information of a monitoring point on a service path that is sent by a detection control apparatus, where the detection agent apparatus is located in the NFV system; the detection agent apparatus obtains fault locating information from the monitoring point based on the location information of the monitoring point, where the fault locating information is information obtained by the monitoring point according to a filter criterion, and the fault locating information includes the location information of the monitoring point; and the detection agent apparatus sends the fault locating information to the detection control apparatus, where the detection control apparatus may determine a faulty monitoring point based on the fault locating information and a service model corresponding to the service path.

Fault detection method, apparatus, and system in NFV system

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Dongguan, China

Shuaibing Wang