The invention discloses a high-voltage backup power supply of a new energy automobile. The circuit comprises a high-voltage input sampling power supply circuit which is used for providing starting power supply voltage for a main chip power supply circuit and closing the power supply voltage of the main chip power supply circuit after the main chip power supply circuit is started; the main chip power supply circuit is used for outputting a PWM (Pulse Width Modulation) driving signal to the isolation step-down driving circuit after being started; the primary side absorption loop is used for absorbing a voltage peak generated by the primary side of the isolation voltage reduction driving circuit; the isolation step-down driving circuit is used for converting the input high voltage into low voltage for output according to the PWM driving signal; the secondary filter circuit is used for filtering the low voltage output by the secondary side of the isolation step-down driving circuit; and the voltage feedback circuit is used for feeding back the secondary side voltage of the isolation step-down driving circuit to the high-voltage input sampling power supply circuit and the main chip power supply circuit. A stable low-voltage backup power supply can be provided for the whole vehicle, driving control of a power motor of the whole vehicle is guaranteed, safety is greatly improved, and the circuit is simple in structure and convenient to implement.
本发明公开了一种新能源汽车高压备份电源。它包括高压输入采样供电电路,用于为主芯片供电电路提供开启供电电压,在主芯片供电电路开启后通过关闭其供电电压;主芯片供电电路,用于在开启后输出PWM驱动信号至隔离降压驱动电路;原边吸收回路,用于吸收隔离降压驱动电路原边产生的电压尖峰;隔离降压驱动电路,用于根据PWM驱动信号将输入高压转换为低压电输出;副边滤波电路,用于对隔离降压驱动电路副边输出的低压电进行滤波处理;电压反馈电路,用于反馈隔离降压驱动电路的副边电压至高压输入采样供电电路和主芯片供电电路。本发明能够为整车提供稳定的低压备份电源,保证了整车动力电机驱动控制,大大提升了安全性,电路结构简单、实现方便。
New energy automobile high-voltage backup power supply
一种新能源汽车高压备份电源
2022-12-23
Patent
Electronic Resource
Chinese
IPC: | H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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