| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-cost power supply circuit superior in high-voltage stability. SOLUTION: The one end point (A) of a primary coil 7 is connected with a drive power supply 6 for connecting the other end point (B) thereof with a switching element 1. Also, a resonance capacitor 3 and damper diode 2 are connected with the point B. The cathode of a diode 4 is connected with the low-voltage side of the resonance capacitor 3 so as to connect its anode with a ground. Connecting the anode of a second diode 5 with the low-voltage side of the resonance capacitor 3, its cathode is connected via a tap with a point (C) present in the wound-down position of the primary coil 7 from the drive power supply side thereof by the voltage portion corresponding to a primary pulse voltage. |
