| 摘要 |
<p>PURPOSE:To prevent the generation of a noise at the time of application and disconnection of power source, and to improve the reliability by controlling intermittently a switching signal to a switching element and controlling intermittently an output voltage of a secondary side of a switching transformer. CONSTITUTION:Based on a voltage inputted as an intermittent control signal to a base of a transistor 8b from a terminal RPC, an intermittent control of a switching signal outputted to a transistor 6d from a switching control circuit 6b is executed. In such a way, by controlling intermittently a switching signal to a transistor 6d without intermitting directly an AC input by using a large power switch of a relay, etc., the intermittent control of an output voltage of a secondary side of a switching transformer 6c is executed. Accordingly, a noise is not generated at the time of application and disconnection of power source and simultaneously, reliability as a power source circuit 9 is improved.</p> |
