Huawei Technologies Co., Limited

Ecoflow Inc.

Wenping Tong

Kui Zhou

Lei Zhang

Boning Huang

Wencheng Wang

A resonant converter and a variable cutoff frequency control method of the resonant converter are provided. The variable cutoff frequency control method includes obtaining a first relationship between a lower limit frequency of the resonant converter and a preset voltage outputted by the resonant converter; updating the preset voltage in the first relationship to a correlative voltage between the preset voltage and an actual voltage outputted by the resonant converter, to obtain a second relationship between the lower limit frequency and the correlative voltage; and limiting the lower limit frequency of the resonant converter according to the second relationship.

Resonant converter and variable cutoff frequency control method

Disclosed herein is a distributed battery pack power supply system, a charging control method, and a discharging control method, where a plurality of battery packs or battery groups is directly coupled in parallel or indirectly coupled in parallel as required using a charging/discharging circuit of the distributed battery pack power supply system and a corresponding control policy. A distributed battery includes a plurality of battery packs, and further includes a controller, a bidirectional voltage transformation circuit, a bypass circuit, a charging circuit, and a charging input end. Each battery pack corresponds to one bypass circuit and one bidirectional voltage transformation circuit.

Distributed battery, battery control method, and electric vehicle

An insulation resistance detection circuit, detection method, and detection apparatus are provided. The circuit includes an alternating-current signal source, a resonant cavity, a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch, and a second switch. The alternating-current signal source is sequentially connected to the first resistor, the resonant cavity, the first switch, the second resistor, and the third resistor in series to form a loop. The first resistor is connected to a positive electrode of the alternating-current signal source, and the third resistor is connected to a negative electrode of the alternating-current signal source. One end of the second switch is connected to a negative electrode of a to-be-detected battery, the other end of the second switch is connected to the fourth resistor, and the other end of the fourth resistor is connected to ground.

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Shenzhen, China

Wenping Tong