High-frequency pulse circuit and peak voltage clamping and absorbing method

Abstract

The invention relates to a high-frequency pulse circuit and a peak voltage clamping and absorbing method and belongs to the technical field of power sources to solve the peak voltage generated by an arc welding power source during high-frequency pulse switching. The high-frequency pulse circuit comprises a three-phase rectifier circuit, a constant-current source, a high-frequency pulse switcher and a peak voltage clamper, wherein the three-phase rectifier circuit is configured to rectify the input three-phase AC power and then output DC power to the constant-current source through a DC bus; the constant-current source is configured to output stable DC power; the high-frequency pulse switcher is configured to chop the DC and output a high-frequency square wave current; the peak voltage clamper is configured to detect, clamp and absorb the peak voltage in the DC chopping process. The high-frequency pulse circuit clamps and absorbs the peak voltage generated in the operation of the high-frequency pulse switching circuit, protects a switching transistor, absorbs the peak energy and feeds the same back to the rectified DC bus, realizes energy recovery and improves power supply efficiency.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a high-frequency pulse circuit and a peak voltage clamping absorption method. Background technique [0002] Arc welding technology has broad application prospects in aerospace, shipbuilding, rail transit and other welding fields. An arc welding power supply with high-quality high-frequency pulse current output capability is one of the important factors to realize and promote high-frequency pulse arc welding technology. [0003] Under the existing technical conditions, the high-frequency pulse arc welding power supply is usually realized by parallel superposition of two sets of power supplies, that is, the high-frequency pulse current is superimposed in parallel on the basic DC current, and during the operation of the high-frequency pulse switching circuit, due to the existence of The inductance makes the power switch tube generate a high peak voltage when it is turned off....

AI Technical Summary

Problems solved by technology

[0003] Under the existing technical conditions, the high-frequency pulse arc welding power supply is usually realized by parallel superposition of two sets of power supplies, that is, the high-frequency pulse current is superimposed in parallel on the basic DC current, and during the operation of the high-frequency pulse switching circuit, due to the existence of The inductance makes the power switch tube generate a high peak voltage when it is turned off. If the peak voltage is not clamped, the power switch tube will be damaged. The value of the voltage clamp also has a great influence on the rate of change of the current rising edge and falling edge. big impact

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