| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply ensuring positive operation. SOLUTION: A secondary power supply circuit 6 has a resonance circuit configuration and a primary winding N1 of a transformer T in the secondary power supply circuit 6 is connected at the end thereof, with the trigger input terminal of a first power supply circuit via diodes D2, D3. A first power supply circuit 4a comprises a control transistor Q2 connected between the base and emitter of a switching transistor Q1, and a constant-voltage diode DZ1 connected between the base of the control transistor Q2 and the output terminal 2. A trigger signal having an AC full-wave rectified waveform is inputted to the base of the switching transistor Q1 via a trigger input terminal 3. |
