Power supply device

A power supply device comprising:

• an AC source;
• rectifying means for rectifying a voltage from the AC power source and producing a pulsating output voltage;
• a high frequency wave generator connected to receive said pulsating output of the rectifying means to produce a high frequency output;
• and
• an auxiliary DC power source connected to rectify part of said high frequency AC output generated from the high frequency wave generator and store it and, when the pulsating output voltage of the rectifying means is at a low level, to discharge it so that an auxiliary voltage is supplied to the high frequency wave generator,
• in which said auxiliary DC power source comprises a feedback winding for generating a high frequency AC voltage which is part of an output of the high frequency wave generator, a capacitor connected at one terminal to a first intermediate tap of the feedback winding, a first series circuit of a first current limiting inductor and first rectifying diode connected between the other terminal of the capacitor and a second intermediate tap of the feedback winding, a second series circuit of a second current limiting inductor and second rectifying diode connected between the other terminal of the capacitor and a third intermediate tap of the feedback winding, and discharge control means connected in series with said capacitor and provided, together with said capacitor, at the input side of the high frequency wave generator, and wherein said the first and second current limiting inductors are wound on a common core.