Active discharge circuit of motor controller

The invention discloses an active discharge circuit of a motor controller, the circuit is provided with a high-voltage battery, a starting switch, a thin-film capacitor and a switching power supply, the high-voltage battery is connected with the thin-film capacitor through the starting switch, the thin-film capacitor is connected with the switching power supply, and the switching power supply is connected with the starting switch. The switching power supply comprises a transformer MC1, a switching tube Q1, a capacitor module and a voltage control circuit, the primary side of the transformer MC1 is connected with the thin-film capacitor through the switching tube Q1, the secondary side of the transformer MC1 is connected with the capacitor module, the voltage control circuit is connected with the capacitor module and the switching tube Q1, and the switching tube Q1 is connected with the voltage control circuit. The voltage of the capacitor module is controlled by adjusting the pulse duty ratio of the switching