| 摘要 |
PROBLEM TO BE SOLVED: To obtain a stable delay time even in a overcurrent state, regardless of fluctuations in supply voltage. SOLUTION: When a detection portion 13 detects either an overdischarge or an overcurrent in a secondary battery 11, the detecting portion outputs a detection signal. When a capacitor C14 for delay receives the detection signal, the capacitor varies the output voltage thereof with a prescribed time constant. A delay circuit A15 compares the varying voltage with a reference voltage set with the battery voltage positive pole-side potential of the secondary battery 11 connected and, when a prescribed voltage is reached, outputs an off-signal for a discharge current to the outside. A delay circuit B16 compares the varying voltage with a reference voltage set with the battery voltage negative pole-side potential connected and, when a prescribed voltage is reached, outputs an off- signal for a discharge current A selection portion 17 selects the off-signal relative to the negative pole-side reference voltage with a stable detection time and, when the selecting portion selects the off-signal, outputs a selection signal to an output portion 12.
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