| 摘要 |
PROBLEM TO BE SOLVED: To provide a small, low-cost self-excited resonance power supply by adding the function of stabilizing output voltage to the power circuit itself of a self-excited resonance system. SOLUTION: In a self-excited resonance power supply of a push-pull configuration, a control device 3a supplies error signals in accordance with the difference between a voltage signal corresponding to an output voltage and a reference voltage to each gate of a first transistor Q1 and a second transistor Q2. These signals change the conducting timing of each transistor, thereby changing the self-excited oscillation frequency. Sine the change of the self-excited oscillation frequency varies the energy amount transmitted from a resonance circuit which comprises the primary winding N1 of a transformer T and a capacitor for resonant oscillation Cre to the secondary winding N2, control of the output voltage is made possible. |
