Study of Pulsed DC Power Supply Parametersfor Micro-EDM

The selection of power supply is one of the most critical aspects to take into consideration in the many manufacturing process. This paper describes about the development of pulsed dc power supply that essential in the micro EDM. The micro EDM is the electro-thermal process that depends on discharge energy through a specific dielectric in order to supply heat to the work piece. A pulsed discharge occurs in small gap between the work piece & the electrode with removal of unwanted material from work piece through the process of melting. The pulsed dc current causes the heating of the dielectric, work piece & electrode. A pulsed dc power supply provides the electric discharge with controls for voltage, current, frequency, duty cycle & polarity.