| 摘要 |
PURPOSE:To ensure a resetting after a prescribed time although the power source is switched on immediately after OFF, by giving an instantaneous discharge to the electric charge of an integrating capacitor with the output of a power supply voltage reduction detecting means. CONSTITUTION:When the power supply switch SW is turned on, the current flows to the exciting winding of the relay RL to open the contact NC. Thus the capacitor C is charged via the resistance R1. When the charging voltage reaches the sensitive voltage of the buffer B, the buffer B delivers an output. With a reduction of the power supply voltage, the relay RL becomes inactive to close the contact NC. As a result, the capacitor C is discharged instantaneously to prepare for the next action. |
