Patent ID: 6788012
Filing Date: 2004-09-07
Classification: H03K

Abstract:
A high voltage pulse generating circuit comprising:a DC voltage source having first and second output terminals; a first semiconductor switch having a low withstand voltage with turn-on and turn-off faculty and having one end connected to said first output terminal of said DC voltage source; a branch circuit including a free-wheel diode connected across the other end of said first semiconductor switch and said second output terminal of the DC voltage source; and a series circuit connected in parallel with said branch circuit and including an inductance and a second semiconductor switch with turn-on and turn-off faculty, said second semiconductor switch being constructed by a series circuit of a plurality of semiconductor switching elements having a high withstand voltage, the number of which is determined in accordance with an amplitude of an output voltage pulse to be generated, said circuit further comprises a plurality of iron cores, the number of which is equal to that of said plurality of semiconductor switching elements, a primary winding passing through said plurality of iron cores and being connected in series with said free-wheel diode and a plurality of secondary windings each passing through respective iron cores and being connected to gates and cathode terminals of respective semiconductor switching elements of said series circuit of semiconductor switching elements; wherein after turning said first and second switches on to store inductive energy in said inductance, the energy stored in the inductance is commutated to a load connected across said second semiconductor switch by turning said first and second semiconductor switches off.