| 摘要 |
<p>AUTO-START AND MAGNETIC SHUT DOWN BATTERY CHARGING AND SURVEILLANCE CIRCUITS Battery charging and surveillance circuits are provided which may have either shunt regulation or series regulation of the control coil. Automatic start up of the charging sequence is initiated when a battery is connected to the output terminals by providing a latch circuit which is powered from a capacitor charged from the high ripple voltage at the open output, which capacitor voltage collapses and causes a one-shot circuit to close, which closes a control power cut-off device in series with the control coil, thereby initiating a battery charging sequence. When the battery is to be disconnected, either a push button switch may be momentarily closed or a latch operates to open the cut-off device, thus causing the output voltage of the battery charging circuit to fall below that of the battery -- the power diodes in the circuit preclude back-charge from the battery -- so that the battery may then be disconnected without any substantial current flow and therefore without any arcing at the output terminals. No electro-mechanical AC power interruptors are required.</p> |
