High-low voltage composite pulse power supply based on Boost and Buck parallel connection

Abstract

The invention discloses a high-low voltage composite pulse power supply based on Boost and Buck parallel connection. The high-low voltage composite pulse power supply comprises a direct-current inputpower supply, a high-voltage breakdown circuit, a low-voltage discharge circuit, a gap current detection circuit, a gap voltage detection circuit, a driving circuit and an FPGA controller, wherein thehigh-voltage breakdown circuit and the low-voltage discharge circuit form a pulse power supply main circuit, a composite circuit topology formed by connecting a Boost circuit and multiple synchronousrectification Buck circuits connected in parallel in an interleaved manner is adopted, and the low-voltage discharge circuit adopts current closed-loop control; the high-voltage breakdown circuit adopts voltage closed-loop control; and flexible switching between the high-voltage breakdown circuit and the low-voltage discharge circuit is completed through gap voltage judgment. According to the invention, the energy utilization rate of the pulse power supply is improved, output current ripples are reduced, and the breakdown high voltage adjustability and discharge current waveform controllability are realized.

Description

technical field [0001] The invention relates to a pulse power supply for electric discharge forming machining, in particular to a high-voltage and low-voltage compound pulse power supply based on the parallel connection of Boost and Buck. Background technique [0002] EDM is often used for cavity processing in mold production. The spark oil used in the electrolyte has high insulation and requires high voltage for gap breakdown. With the increase of machining depth, the chip removal of EDM machine tool is not good, which will easily lead to the deterioration of discharge conditions and more abnormal discharge phenomena. Restricted by the average voltage method of the current servo tracking, the distance between the tool electrode and the workpiece electrode is adjusted by the voltage at both ends of the gap. At present, the pulse power supply for EDM mainly adopts resistive pulse power supply. The high voltage of gap breakdown is provided by the transformer, which cannot be ...

AI Technical Summary

Problems solved by technology

At present, the pulse power supply for EDM mainly adopts resistive pulse power supply. The high voltage of gap breakdown is provided by the transformer, which cannot be adjusted flexibly; the control of discharge energy can only be controlled by adjusting the discharge resistance and switching frequency. Low efficiency, poor controllability of current waveform and other shortcomings

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