Pulse generator for electroerosive processing

A pulse generator for electroerosive processing by means of electrical discharges between a tool electrode and a workpiece electrode, consisting of a main voltage source connected with two output terminals of the generator between the tool electrode and the workpiece electrode through a switching circuit which is activated by an adjustable oscillator, the improved switching circuit therein comprising:

• an auxiliary voltage source,
• at least two identical impulse amplification stages, each comprising:
• an impulse transformer having a primary winding and also having first and second secondary windings,
• said first secondary winding being connected between the first side of said auxiliary voltage source and a base of a power transistor, and said second secondary winding being connected between said base and through a diode to a collector of said power transistor,
• an emitter of said power transistor being connected to the other side of said auxiliary voltage source and also to one side of said main voltage source, the other side of said main voltage source being connected to one of said output terminals.
• said primary winding of said transformer being for the first of said stages connected to said oscillator, and said primary winding for all additional said stages being connected in series between said collector of said power transistor of said first stage and through a current-limiting resistor to said other side of said main voltage source, the collector of said power transistor of all additional said stages being connected through current-limiting resistors to the other of said output terminals.