| 摘要 |
PURPOSE:To permit power supply to an integrated circuit to be stopped by a method wherein condition signal patterns are compared with a plurality of preset normal fan operating patterns by a group of comparison circuits and abnormal fan operating signals are generated by the logical operation of each of the outlets from a group of comparison circuits. CONSTITUTION:Nine comparison circuits CPM0-CPM8 are provided for nine normal operating patterns of fan, and fan condition signals FAN0-FAN7 are entered into (A) inputs A1-A8 of the comparison circuits CPM0-CPM8 and the normal operating patterns of the fans are set individually to (B) inputs B1-B8. If the operation of the two or more of the eight fans become abnormal, all of the fan condition signals disagree with all of the nine normal fan patterns, the output signal of each of comparison circuits CPM0-CPM8 becomes 'L', the output of a logical sum OR 6 also becomes the abnormal condition 'L', the abnormality is informed to an electric source control part 4 and power supply to an integrated circuit 5 is stopped. |
