| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent undue temperature rise or firing of an IC surely. <P>SOLUTION: When a driver IC 50 is operating normally and a strobe signal being outputted from a shift register 106 to a one-shot timer 82 at a predetermined time interval has ended output of the next strobe signal before output of an ON signal from the one-shot timer 82 to a relay 81 has ended, output of the ON signal from the one-shot timer 82 to the relay 81 is continued, thus sustaining a state where a drive pulse power supply and a drive circuit 62 are connected through a VDD2 interconnect 55 for drive. When a fault arises in the driver IC 50 and a strobe signal is not outputted from the shift register 106 to the one-shot timer 82, the ON signal is not outputted from the one-shot timer 82 to the relay 81 and connection of the drive pulse power supply and the drive circuit 62 through the VDD2 interconnect 55 for drive is interrupted. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
