| 摘要 |
PROBLEM TO BE SOLVED: To reduce wasteful power consumption and cost of a power supply circuit, using a rush current preventive circuit. SOLUTION: A normally-open contact Sy1 of a relay RL which operates, when the charge value of the smoothing capacitor C1 of a rectifying/smoothing circuit 3 reaches a prescribed value is inserted in one L of feeder lines L and N, between a power supply switch 2 and the rectifying/smoothing circuit 3. Two heaters HR1 and HR2, of which a heater circuit is composed, are connected in series with each other and are connected in parallel with the normally- open contact Sy1 of the relay RL. A connection point (e) between the two heaters is connected to the other feeder line N between the power supply switch 2 and the rectifying/smoothing circuit 3 via an energizing control circuit 11.
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