| 摘要 |
PROBLEM TO BE SOLVED: To supply a necessary power supply voltage economically with a small dimension, to a device and make a holding current simply adjustable. SOLUTION: This control device has a holding coil 1, an electronic switch T4, and a power supply circuit 8 connected to a terminal of a power supply voltage Va of the coil 1 in series. A circuit to measure a holding current is connected to the power supply circuit 8 in parallel, and has an additional electronic switch and a measuring resistor R4 in series. Thus the power supply circuit is electrically supplied by the holding current in the coil 1, and the additional switch T5 is regularly closed to measure the holding current adjusted by a microprocessor circuit 9 which controls two electronic switches T4, T5.
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