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

Abstract

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.

Description

technical field [0001] The invention is a bias power supply device suitable for super-audio frequency pulsed electron beam welding, specifically, it is a topological circuit structure of a bias power source suitable for electron beam welding and controlling the electron beam to reach super-audio frequency, and belongs to the electronic circuit technology field. Background technique [0002] In the field of electron beam welding, compared with continuous beam electron beam welding, pulsed beam electron beam welding with equal power can effectively improve weld penetration and weld depth-to-width ratio; welding workpieces of the same thickness can reduce heat loss. input, reducing welding distortion. For pulsed electron beam welding, pulsed beam frequency is one of the important process parameters that affect welding quality. For the 60kV ~ 150kV electron beam welding power supply, it is very difficult to realize the technology of boosting the low-voltage pulse to the medium...

AI Technical Summary

Problems solved by technology

When welding large-thickness workpieces, the required welding beam current is as high as hundreds of milliamps. It is very difficult to achieve hundreds of milliamperes of ultra-audio pulse beams with conventional pulse bias power control technology.

Even if it can be realized, the bias pulse waveform will be severely distorted, which will seriously affect the quality of the pulse beam

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