| 摘要 |
PURPOSE:To continue a safe operation even at a power source malfunction time by interrupting a signal of a controller by detecting the voltage drop of a driver power source. CONSTITUTION:If a power interruption (or a power source breakage) occurs, the output voltage VB of a driver power source 41 drops, a voltage detector 8 detects it to vary a signal B, thereby setting the output signal C of a logic circuit 10 to Hi. Then, the transmission of a timing signal D is interrupted, a switching signal IB of a switching drive circuit 6 is also interrupted, and the inverting operation of the inverter is stopped. Further, a control voltage PV5 of a control power source 42 drops to the normal operation enabling voltage PV5' of lower of a controller 5, the controller 5 stops operating. |
