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KEBODA has been granted an invention patent authorization: "Pre charging device for high-voltage bus capacitors of new energy vehicles"

Article Source：Qichacha | Author：Securities Star | Issuing Time：2024.05.16
Securities Star News: According to data from Qichacha, KEBODA (603786) has obtained a new invention patent authorization, titled "Pre charging Device for High Voltage Bus Capacitors of New Energy Vehicles". The patent application number is CN202010157847.6, and the authorization date is May 14, 2024.



Patent abstract: A pre charging device for a high-voltage bus capacitor of a new energy vehicle, comprising a bidirectional DC-DC conversion circuit, a capacitor voltage sampling circuit, and a controller; The bidirectional DC-DC conversion circuit is coupled between the high-voltage bus capacitor and the charging power supply, and the output end of the capacitor voltage sampling circuit is coupled with the input end of the controller. The bidirectional DC-DC conversion circuit includes an isolation transformer, a first rectifier/inverter circuit, a second rectifier/inverter circuit, an inductor Lf, a switching transistor Q7, a switching transistor Q8, and a capacitor Cbuffer. The controller can control the bidirectional DC-DC conversion circuit to work in pre charging mode. In pre charging mode, the bidirectional DC-DC conversion circuit first charges the high-voltage bus capacitor in push-pull circuit mode. After the voltage of the high-voltage bus capacitor reaches the predetermined threshold, the bidirectional DC-DC conversion circuit charges the high-voltage bus capacitor in isolated boost circuit mode. The present invention has a simple structure, low cost, and is safe and reliable.

Since the beginning of this year, KEBODA has obtained 13 new patent authorizations, an increase of 225% compared to the same period last year. Based on the financial data of the company's 2023 annual report, the company invested 444 million yuan in research and development, a year-on-year increase of 18.5%.
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