摘要 |
PROBLEM TO BE SOLVED: To provide a power supply unit which is excellent in power saving by suspending the oscillation of a control IC in an unloaded condition. SOLUTION: The power supply unit includes a secondary battery; a Hall element to which electric power is supplied from the secondary battery, and which is turned on and off through magnetic coupling by attachment and detachment of a load device; a photocoupler which is turned on and off by the Hall element; and a semiconductor switching element for power supply of the control IC which is turned on and off by an output of the photocoupler, and turns on and off a power terminal of the control IC. COPYRIGHT: (C)2006,JPO&NCIPI
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