Pulsed power supply with parallel high-energy capacitors for electrosparking

Abstract

The invention relates to a pulsed power supply for electrosparking in the machining field, in particular to a pulsed power supply with parallel high-energy capacitors for the electrosparking. The power supply comprises a rectification circuit (1), a power factor correction circuit (2), a voltage regulator circuit (3), a high-energy capacitor charge and discharge circuit (4), a voltage and current detection circuit (6), a machining control module circuit (7) and a PWM (Pulse-Width Modulation) control circuit (8). The pulsed power supply can provide approximately 150 V no-load breakdown voltages and 100-500 J discharge energy for an electrical discharge machining gap (5) in a single discharge process. The power supply adopts an accumulator structure, the parallel large-capacity capacitors are charged and discharged independently; the high energy stored in the capacitors is directly released to a discharge gap without passing through a current-limiting resistor, so that high instantaneous discharge energy and a strong discharge explosive force can be achieved; the power supply is applicable to difficult-to-machine materials such as ceramics and polycrystalline diamonds in the machining engineering; the current-limiting resistor with serious energy consumption is removed thoroughly; and the utilization rate of electrical energy can be increased by 2-3 times.

Description

technical field [0001] The invention relates to a pulse power supply for electrical discharge machining in the field of machining. Background technique [0002] Pulse power supply is an important part of the EDM system, and its performance directly affects the speed, accuracy, efficiency, stability and reliability of EDM. There are many types of EDM pulse power supplies. The traditional pulse power supply connects the current-limiting resistor in series in the discharge main circuit, so that the power utilization rate of the pulse power supply is lower than 25%, and nearly 75% of the electric energy is consumed in the form of heat on the current-limiting resistor. The power utilization rate is reduced, and higher requirements are put forward for the heat dissipation system of the power supply and the working performance of electronic components. With the development of power electronics technology and the emergence of high-power devices, domestic and foreign scientific and ...

AI Technical Summary

Problems solved by technology

[0003] Engineering ceramics, polycrystalline diamond and other difficult-to-machine materials mostly rely on the internal conductive network to transmit current during EDM, which has the characteristics of poor electrical conductivity, high melting point and good thermal conductivity. , high energy consumption, poor uniformity of discharge, and the processing effect is difficult to meet the requirements of use, so this kind of difficult-to-machine materials requires a special pulse power supply when EDM is performed.

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