| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect abnormality of the contact resistance of a contact part with sufficient accuracy, even if its current value increases or decreases. <P>SOLUTION: An abnormality detection apparatus for detecting abnormality of a contact resistance 62 of a drawer connector 61 mutually uniting connecting parts which touch electrically, is provided with a reference resistor 55 whose resistance value has bee already known, a first operational amplifier 52 for outputting the voltage difference between both terminals of the reference resistor 55 from a current flowing in common in the reference resistor 55 and the contact resistance 62, a second operational amplifier 53 for outputting the voltage difference between both terminals of the contact resistance 62, and a comparator 54 for comparing the output values of the first and second operational amplifiers 52, 53. Based on an output result of this comparator 54, the abnormality of the contact resistance 62 is detected by inversion of its output. <P>COPYRIGHT: (C)2007,JPO&INPIT |
