In order to solve the problem of low efficiency of micro-EDM, a micro energy pulse power supply for multi electrode synchronous micro-EDM was designed. The power supply outputs high-frequency PWM signals from the processor STM32F103RCT6, which processed by the discharge control loop can drive the high power field effect transistor to control the capacitance charge-discharge. Capacitance quantitative energy storage and pulse width adjustment of micro energy pulse are realized by changing the

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... cycle of PWM. It combines with gap state detection technology to distinguish the gap state of each electrode and adjust the gap between the workpiece and electrode in time. The Experimental tests show that the power supply can achieve efficient and stable EDM.