| 摘要 |
<p>PURPOSE:To execute the restoration even when a relay is opened by reason of an impact, etc. by using AND of a first waveform shaping circuit connected to the other end of a switch, and a second waveform shaping circuit corresponding to a fall of an output of a differentiation circuit of an output side of the relay, as a control voltage. CONSTITUTION:The subject circuit is provided with a relay 1 in which a contact 11 is opened and closed in accordance with a fall and a rise of a control voltage applied to a coil 12, and one of the contact 11, and the other are connected to a power source 2 and an output terminal 4, respectively. Also, a switch 3 for controlling the opening/closing of a power source output is provided, and one terminal thereof is connected to the power source 2. Moreover, this circuit is provided with a first waveform shaping circuit 6 connected to the other terminal of the switch 3, a differentiation circuit 5 for inputting an output of the power source passing through the contact of the relay 1, a second waveform shaping circuit 7 for outputting a negative pulse of width determined in advance is accordance with a fall of its output, and an AND circuit 8 for outputting AND of outputs of the waveform shaping circuits 6, 7 as a control voltage. In such a way, opening and closing of the relay brought to malfunction due to external vibration caused by an impact, etc., can be restored to a normal state.</p> |
