| 摘要 |
<p>PURPOSE:To automatically restore a latch type electromagnetic device when power source is cut off or power supply voltage drops lower than the specified value. CONSTITUTION:PS is a DC power supply circuit, consisting of a power source E and a switch SW, generates +12V of voltage to energize a latch type electromagnetic device LEM and +5V of voltage to operate a circuit to control the latch type electromagnetic device LEM. AM is a circuit to generate an attracting solenoid driving signal to generate the attracting solenoid driving signal Sa, and RM is a circuit to generate restoring solenoid driving signal to generate the restoring solenoid driving signal Sr. +5V of DC power supply circuit PS is applied to a power supply terminal +Vcc for the attracting solenoid driving signal generating circuit AM and the restoring solenoid driving signal generating circuit RM through a charging circuit consisting of a back current protecting diode D1 and a capacitor C1. The RESET terminal of the attracting solenoid driving signal generating circuit AM is applied an output of an initial reset circuit consisting of a resistor R1, a diode D2 and a capacitor C2 so as to prevent an erroneous operation by an oscillation.</p> |
