| 摘要 |
A circuit prevents a generating machine from being operatively connected to a battery whenever the battery has been connected with a reverse polarity. The machine is coupled through the anode-cathode path of a silicon-controlled rectifier to the battery and the rectifier is switched on in response to current pulses in the field winding of the machine. A primary winding of a pulse transformer and the secondary winding of the pulse transformer are employed to supply gating pulses to the controlled rectifier. The transformer has a saturating winding which is energized when the battery is connected in a reverse direction so that no gating pulses are coupled through the transformer to the gate of the controlled rectifier to turn on the controlled rectifier.
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