| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a simple voltage detection means having high reliability, by which an excess or deficiency of a drive voltage to drive a switching element is detected. <P>SOLUTION: In a controller 1, a potential Vj of a connection point J between a first resistance 151 and a second resistance 152 of a voltage detection circuit 15 is input into a microcomputer 4. In a memory 41, the potential Vj is sampled at an interval 1 msec, and the sampled values are sequentially stored. A calculation section 42 calculates a moving average value S of newer four sampled values out of stored sampled values. A determination section 43 determines whether a threshold Ha is equal to or less than the moving average value S, and the moving average value S is equal to or less than a threshold Hb. When the threshold Ha is equal to or less than the moving average value S and the moving average value S is equal to or less than the threshold Hb, the microcomputer 4 continuously outputs signals to a drive IC5; and when the moving average value S is equal to or less than the threshold Ha or the threshold Hb is equal to or less than the moving average value S, the microcomputer 4 stops the signal output to the drive IC5. <P>COPYRIGHT: (C)2011,JPO&INPIT |
