| 摘要 |
<p>A protective circuit for protecting a rechargeable battery from battery breakdown caused by prolonged overcharging, and a protective element incorporated in this circuit are provided. A main protective circuit (A) is equipped with main control means (1) for shutting off a first FET (11) or a second FET (12) when any of overcharging, overdischarging, or excessive discharge current is detected. A sub-protective circuit (B) is equipped with sub-control means (2) for shutting off a third FET (13) when the anti-overcharging function of the main control means (1) is not operating properly. <IMAGE></p> |
