| 摘要 |
PURPOSE:To use an inexpensive switch element which has small current capacity by interrupting a starting current when a power source OFF control signal is input, and stopping the operation of an error detector to cut off a switching transistor. CONSTITUTION:A power source circuit is composed of an input rectifier 1 having a bridge type rectifier and a smoothing condenser, a starting current controller 2, a blocking oscillator 3, a converter transformer 4, a switching controller 5, an output rectifier 5, an error detector 7, a remote control signal input unit 8, and an auxiliary power source 9. When a power source OFF control signal is input, a starting current to the base of a switching transistor TR5 is shut off by switching transistors TR1, TR2, the operation of the detector 7 is stopped by switching transistors TR10, TR11 to cut off a switching transistor TR5. |
