| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly reliable power supply commonly operable with different voltages. SOLUTION: A smoothing capacitor divided in series into two Ci1, Ci2, primary windings of an insulating converter transformer PIT is divided into two T11, T12 and connected, at the other ends thereof, with the collector of transistors Q11, Q12 having a push-pull driven resonance circuit. Positive pole side of the capacitor Ci1 is connected with one end of the winding T11 and the positive pole side of the capacitor Ci2 is connected with emitter of the transistor Q11 through the fixed contact (a) and the movable contact (c) of a switch SW1. Furthermore, the movable contact (c) of the switch SW1 is connected with the fixed contact (a) of a switch SW2 having a movable contact (c) connected with one end of the winding T12. Fixed contact (b) of the switch SW1 is grounded and the fixed contact (b) of the switch SW2 is connected with the positive pole side of the capacitor Ci1. The switches SW1, SW2 are controlled depending on the voltage on the positive pole side of the capacitor Ci1.
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