High-voltage electric energy discharge circuit, PCB circuit board and piezoelectric driver

The high-voltage electric energy discharge circuit comprises a discharge circuit and an output electrolytic capacitor of a high-voltage power supply, the discharge circuit comprises a discrete switch and a plurality of discharge resistors, the discrete switch comprises a plurality of resistors, an N-channel MOS tube and a unidirectional thyristor, and when the discrete switch does not receive a control signal, the discharge resistors are switched on and switched off. When the high-voltage power supply is switched on, the N-channel MOS tube is switched off, the gate pole of the unidirectional thyristor is pulled up through the pull-up resistor, so that the unidirectional thyristor is switched on, and the electric charges stored by the output electrolytic capacitor of the high-voltage power supply are released through the plurality of discharge resistors. The discrete switch is designed to replace a normally-closed relay switch in the prior art, the discrete switch can automatically control the switch to be clo