The invention provides a discharge circuit of a smoothing capacitor and a power conversion circuit, which are helpful for avoiding unnecessary discharge of the smoothing capacitor and realizing miniaturization and low cost of the discharge circuit. A discharge circuit of a smoothing capacitor is connected in parallel to a smoothing capacitor in a power conversion circuit for driving a motor of a vehicle, the power conversion circuit including a battery, the smoothing capacitor, and a power conversion unit. The discharge circuit includes: a first switching element; a second switching element connected in series with the first switching element between the positive electrode of the battery and the ground; a drive circuit connected to a controller of the vehicle and turning on or off the first switching element according to a command from the controller; and an ON/OFF control circuit that turns on the second switching element to discharge the smoothing capacitor when the drive circuit turns on the first switching element according to a command from the controller, and turns off the second switching element after a predetermined time elapses from the turn-on of the first switching element.
一种平滑电容器的放电电路及电力转换电路,有助于避免平滑电容器不必要地进行放电,并实现放电电路的小型化和低成本化。本发明的平滑电容器的放电电路与用于驱动车辆的马达且包括电池、平滑电容器及电力转换部的电力转换电路中的平滑电容器并联连接,包括:第一开关元件;第二开关元件,其与第一开关元件串联连接在电池的正极与接地之间;驱动电路,其与车辆的控制器连接,且根据来自控制器的指令使第一开关元件接通或断开;以及接通断开控制电路,其在驱动电路根据来控制器的指令使第一开关元件接通时使第二开关元件接通而使平滑电容器放电,且使第二开关元件在从第一开关元件接通起经过了经过预设时间后断开。
Discharge circuit for smoothing capacitor and power conversion circuit
平滑电容器的放电电路及电力转换电路
25.07.2023
Patent
Elektronische Ressource
Chinesisch
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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