Bias power supply device for supersonic-frequency pulsed electron beam welding

The invention is a bias power supply device for supersonic-frequency pulsed electron beam welding. The device is composed of a step-down rectifier-filter circuit, a peak bias voltage generating circuit, a base bias voltage generating circuit, a peak pulsed bias voltage switching circuit and a base pulsed bias voltage switching circuit. When a power transistor Q5 of the peak pulsed bias voltage switching circuit is opened and a power transistor Q6 of the base pulsed bias voltage switching circuit is closed, a peak bias voltage Up generated by the peak bias voltage generating circuit causes a peak pulsed bias voltage Upp to act on the gate of an electron gun, thus obtaining a peak pulse beam current Ipp; and when the power transistor Q5 of the peak pulsed bias voltage switching circuit is closed and the power transistor Q6 of the base pulsed bias voltage switching circuit is opened, a base bias voltage Ub generated by the base bias voltage generating circuit causes a base pulsed bias voltage Ubp to act on the gate of the electron gun, thus obtaining a base pulse beam current Ibp. The bias power supply device for supersonic-frequency pulsed electron beam welding provided by the invention is capable of realizing that the pulsed bias voltage frequency is not less than 20 kHz and the frequency of the pulse beam current is greater than or equal to 20 kHz correspondingly.