| 摘要 |
<p>PURPOSE:To maintain supply of stabilized voltage having no stress to a battery power source by driving a solenoid when a capacitor voltage is always higher than the specified voltage. CONSTITUTION:When a voltage of capacitor C1 is higher than the specified voltage and an external signal is given to a receiving circuit 4, a photo-coupler PC of receiving circuit 4 turns ON a transistor T2 of switching circuit 5 turns OFF a transistor T1 of switching circuit 5 turns ON by receiving an output signal of voltage detection circuit 2 and a solenoid load turns ON. Meanwhile, if the voltage of the capacitor C1 does not reach the specified voltage, the output signal of the voltage detecting circuit 2 is not obtained and therefore transistor T1 for controlling solenoid load does not turn ON even when the photo-coupler PC of receiving circuit 4 turns ON. Namely, only when the voltage of capacitor C1 is in the specified voltage range, the switching circuit 5 is caused to operate and the solenoid load L operates. Values of high impendance element R1 and capacitor C1 are set considering a driving energy of solenoid load L and a charging time of capacitor C1.</p> |
