| 摘要 |
<p>In order to automatically restore the normal switching position of a relay armature after an accidental external impact has switched it to the off position, the output of the relay is monitored and is applied to a differentiating circuit. A compartor is provided to reflect on and off operations of a main switch. In the event that the output of the relay drops suddently, the differentiating circuit outputs a pulse to a waveshaping circuit (e.g., a Schmitt trigger). A gate circuit is supplied with the outputs of the wave-shaping circuit and the comparator. The out- put of the gate circuit momentarily allows a relay driver to actuate the relay in response to the undesired change in relay status, and hence the relay armature resumes the on position.</p> |
