| 摘要 |
PURPOSE:To prolong the life of an electric power supply circuit, by supplying electric power to a heat element in turn with time lag, when the electric power is applied to the heat element. CONSTITUTION:When a power source switch 5 is turned on, AC voltage is supplied to a controlling circuit 13 through a transformer 6 and a rectifier 12. Therefore, the 1st relay 10 is excited in a moment and AC voltage is supplied to the 1st heat element 21 at the same time when the switch 5 is turned on. While, at the same time, when DC voltage is stored in a capacitor 16 and the set voltage of a voltage regulator diode 15 is obtained, the 2nd relay 11 is excited and AC current flows to the 2nd heat element 22. By such a way, as the circuit 13 supplies electric current to the 1st heat element 21 and the 2nd heat element 22 in turn with time lag, when the switch 5 is turned on, maximum rush current is dispersedly generated, and therefore, the life of an electric power supply circuit is prolonged. |
