At present, the highest cutting efficiency of HSWEDM has been over 200mm2/min. However, the traditional pulse power only improved pulse energy in this situation, which will cause the molybdenum wire severely worn and may be broken in short time. According to the discharging waveform of the pulse power, the differences between the traditional pulse power and high efficiency, low wire wear pulse power were analyzed, meanwhile the discharge mechanism of the efficiency and low wire wear of pulse power was also researched. The research shows that, controlling the discharge current of the leading and trailing edge by the ladder pulse and cutting off the abnormal pulse promptly can reduce the wear of the wire electrode. On the other hand, equal energy pulse used in the process, can effectively improve the chance of discharge and utilization rate of pulse. Finally, the new type pulse power supply apparently increases the cutting efficiency, improves the surface roughness of work-pieces and realizes to cut steadily in the condition of 190~200mm2/min cutting efficiency.
