| 摘要 |
<p>PURPOSE:To enable one circuit to detect three abnormal states by detecting the short-circuit state and disconnection state of a circuit, and the abnormal state of an actuating circuit by deciding them by a deciding circuit. CONSTITUTION:Deciding circuit 1 receives four signals; the output signal of current detecting circuit 2 detecting an electric current flowing from terminal (+) of load electric power source Vcc to the circuit by way of resistances R1 and R3, that of current detecting circuit 3 detecting an electric current flowing from terminal (+) of load electric power source Vcc to terminal (-) of the electric power source by way of resistance R1 and Zener diode D3, that of voltage supervising circuit 4 supervising a voltage between circuits (between (c) and (d)) by detecting an electric current flowing through resistance R2, and a start signal, and decides three kinds of abnormal states such as the short circuit and disconnection of circuits and abnormality of actuating circuit 6a on the basis of states of those input signals.</p> |
