| 摘要 |
<p>A load driving circuit in which an emergency switch for forced stoppage and a service switch for controlling current are connected in series with a load power-feeding circuit. An emergency switch (SWA) and a service switch (SWB) are connected in series with the load power-feeding circuit and the switch (SWB) is periodically turned off for a short time in accordance with the control signal (X) of a service switch control circuit (30). The turn-off state of the switch (SWB) is monitored through the output signal (AC) of a monitoring circuit (40). When the output signal (AC) of the circuit (40) is not generated for more than the off-delay time of an off-delay circuit (21), the control signal (Z) of an emergency switch control circuit (20) is stopped and the switch (SWA) is forcedly turned off.</p> |
