Anti-electrolysis high-low voltage composite micro pulse power supply

Abstract

The invention discloses an anti-electrolysis high-low voltage composite micro pulse power supply and a control method thereof. The power supply comprises a DC power supply, a pulse power supply main circuit composed of a primary side circuit, a flyback high voltage breakdown circuit, a micro pulse power supply main discharge circuit and a negative voltage anti-electrolysis circuit, an FPGA controlcircuit, a drive circuit and a current and voltage detection circuit. During processing, a gap voltage and a gap current are respectively sampled as the feedback quantity, are inputted to an FPGA control module and are calculated according to the processing requirements to generate the corresponding PWM signals, and the PWM signals are filtered and amplified by the drive circuit and then drive the switching tubes in the pulse power supply main circuit to be switched on and switched off respectively, so that the high-voltage breakdown is carried out firstly; then the main discharge circuit carries out discharge machining on the gaps; and finally, the anti-electrolysis working state is achieved, so that the anti-electrolysis high-low-voltage composite micro-pulse power supply function is achieved. According to the present invention, the power supply volume is reduced, and the power supply utilization rate, the machining precision and the surface quality are improved.

Description

technical field [0001] The invention relates to a micromachining pulse power supply, in particular to an anti-electrolysis high and low voltage composite micropulse power supply. Background technique [0002] Micro-EDM inherits the characteristics of ordinary EDM, such as small macro force and non-contact processing, and has the advantages of low stress, no burrs, and high hardness materials. It is suitable for processing difficult-to-cut materials and complex shapes or special parts. , has become an important precision processing method in the field of micro-manufacturing, and is playing an increasingly important role in aerospace, automotive, biomedical equipment and other industries. [0003] With the continuous improvement of the processing size and precision requirements of micro-machines, higher requirements are put forward for micro-machining. The micro-pulse power supply is the key device of the micro-EDM system, and its performance determines the processing efficie...

AI Technical Summary

Problems solved by technology

The traditional fine pulse power supply is mostly RC type pulse power supply. Generally, the capacitor is charged by the DC source through the charging resistor. At the same time, the capacitor is connected to the gap through the current limiting resistor to discharge the gap. By adjusting the capacitor value and open circuit voltage, a small processing is obtained. Energy, but there are disadvantages such as low power utilization rate, low processing efficiency, no switching element isolation between the DC source and the gap, and poor discharge stability. It has become increasingly difficult to meet the requirements of advanced pulse power supplies.

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