| 摘要 |
PURPOSE:To contrive power source efficiency as well as to enable to use the power source of small capacity by a method wherein the flyback current which was consumed uselessly is fed back to the power source. CONSTITUTION:The coils L1 and L2 of the electromagnetic magnet which drives a pin, switching transistors TR1 and TR2 with which the coils L1 and L2 will be driven, and a switching circuit SC, consisting of a transistor TR0 and a protective diode D0, are provided. Also, the flyback current of the coil L1 is fed back to the power source section P by the series circuit consisting of a diode D1 and a Zener diode ZD1. Besides, a charge capacitor CB, a diode DB with which the flyback current will be sent, a resistor R wherein the switching signal S for the switching circuit SC will be coupled, and a constant current power source are provided respectively. |
