| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an abnormality detection circuit capable of detecting abnormality in a battery and abnormality in a circuit for detecting the abnormality in the battery while saving wiring in the case where a plurality of batteries are used, and provide a battery power supply system. <P>SOLUTION: An abnormality detection circuit includes: a plurality of circuit blocks 21; diodes D1-1 to D1-3; diodes D2-1 to D2-3; and a controller 20. Each of the plurality of circuit blocks 21 includes: a notification signal generator 23 which outputs a pulse signal as an output signal when normality is determined by an abnormality detector 22, and outputs a high-level direct current (DC) voltage is output as an output signal when abnormality is determined; and a smoothing circuit 24 that smooths the output signal to generate a smooth voltage E. The diodes D1-1 to D1-3 apply a maximum voltage among the smooth voltages E to a first wiring L1, and the diodes D2-1 to D2-3 apply a minimum voltage among the smooth voltages E to a second wiring L2. The controller 20 determines that abnormality occurs when a voltage of the first wiring L1 exceeds a first threshold value and when a voltage of the second wiring L2 falls below a second threshold value. <P>COPYRIGHT: (C)2012,JPO&INPIT |
