| 摘要 |
A solenoid driver circuit having a power supply, a capacitor connected to the power supply, a current pump which oscillates between the on and off condition to charge the capacitor from the power supply, a voltage limiting circuit which limits the voltage of the charge on the capacitor, a solenoid connected to the capacitor and, a solenoid switch which, when activated, closes such that the charged capacitor discharges through the solenoid. After the capacitor is discharged, holding current is supplied to the solenoid from the power supply. The current pump is held off while the solenoid switch is closed so that the current pump will not attempt to charge the capacitor while holding current is being supplied to the solenoid.
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