| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a digital output circuit capable of detecting component failures at an arbitrary timing by a simple configuration without wrong outputting to a load, in a digital output circuit used for a railway system requiring a high reliability and a high operation rate. <P>SOLUTION: A digital output circuit is configured by a DC power supply 1, a switch element 6 for controlling whether or not a voltage is applied to a load 8, a capacitor 7 connected in parallel to the load 8, a voltage detection circuit 5 connected to an input side of the switch element 6, an AC power supply 2 and a resistor 3 for applying an AC voltage to the digital output circuit, and a changeover switch 4 for connecting the AC power supply to the digital output circuit. <P>COPYRIGHT: (C)2013,JPO&INPIT |
