| 摘要 |
<p>PURPOSE:To continuously the operating voltage of a prescribed level to an external device right after a power supply switch is turned off by setting a resetting FF using a battery as a power supply between the power supply switch and a boosting circuit. CONSTITUTION:When a power supply switch 601 is turned on, a resetting FF 103 sets an output signal. Thus a boosting circuit 602 produces the operating voltage from a battery 604 and sends it to an external electronic equipment. When the switch 601 is turned off, this power supply OFF signal is sent to the external electronic equipment. Thus the FF 103 never resets the output signal as long as no power supply control signal is supplied despite the input of the power supply OFF signal. As a result, the circuit 602 produces and sends continuously the operating voltage of a prescribed level. Then the output signal of the FF 103 is reset when the power supply control signal is supplied from the external electronic equipment. Thus the circuit 602 stops its boosting action for the first time.</p> |
