Spot welder pulse output control circuit adopting transformer to output direct current pulses

Abstract

The invention discloses a spot welder pulse output control circuit adopting a transformer to output direct current pulses. The spot welder pulse output control circuit comprises an MCU automatic control circuit, a constant-current constant-voltage control circuit, the pulse transformer B2L, an energy-storage capacitor C, a first power switch V1, a second power switch V2, and a third power switch V3, wherein the pulse transformer B2L, the first power switch V1, the second power switch V2, the third power switch V3 and a fourth power switch V4 form a Y-shaped welding pulse output drive circuit, so that the spot welder pulse output control circuit has a function of switching positive pulse output, negative pulse output or alternate positive-negative direct current pulse output fast at any time, the amplitude and the width of output positive pulses and negative pulses can be adjusted freely as required, and can be different, the polarity of direct current pulses output by the transformer can be switched fast at any time, and the amplitude and the width of the pulses can be adjusted freely. According to the invention, the domestic technology blank that output polarity switching of direct current pulses in the field of spot welders is monopolized by foreign technologies is filled.

Description

technical field [0001] The invention relates to an electronic spot welder and an inverter spot welder, in particular to a spot welder pulse output control circuit in which a transformer outputs DC pulses. Background technique [0002] Due to the ever-changing products that need to be welded, a welder needs not only the traditional constant voltage output, but also a constant current output to meet the requirements of high-end users. Therefore, the host of the existing spot welding machine is a welding energy control part, which is provided with two digital switches for controlling output pulse amplitude (voltage) and pulse width (time). There is a power switch and a power output cable (connected to the welding head clamp) on the main machine; the circuit design adopts automatic adaptive adjustment technology, which can automatically adjust according to the parameters of the welding head and the different characteristics of the weldment, so that the pulse current passing thro...

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Problems solved by technology

[0003] Although progress has been made to a certain extent, it is only limited to the adjustment of pulse amplitude (voltage) and pulse width (time). First of all, the adjustment of digital switches is a step-by-step adjustment, which cannot meet special requirements (such as positive and negative polarity welding) , infinitely adjustable pulse amplitude and width) weldments, therefore, the DC pulse polarity output by the traditional electronic spot welding machine transformer is single, and still cannot be switched at any time, and the pulse amplitude and width cannot be adjusted at will

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