Patent ID: 7176735

Claim:
A wave-shaping circuit comprising: an inductor connected in series to a DC power supply and to a charging switch; a capacitor connected in parallel to said charging switch; a reverse-current preventing element disposed between said inductor and said capacitor, with a forward direction being directed from said inductor to said capacitor; a discharge resistor connected parallel to said capacitor and connected in series with a discharge switch; and a controller selectively sending a pulse control signal to a selected switching element selected from the group consisting of said charging switch and said discharge switch, said controller setting a pulse on width and a pulse off width for the pulse control signal during each pulse repetition period; wherein said pulse control signal opens and closes said selected switching element, thereby altering a charge potential of said capacitor so that a desired output potential waveform increased from a potential of said DC power supply is formed between a pair of output terminals connected to terminals of said capacitor.