| 摘要 |
A charging circuit is provided with a battery connecting terminal for connecting a secondary battery; an electric power connecting terminal for receiving an electric current to charge the secondary battery from an electric power source unit; first and second switching elements serially connected between the electric power connecting terminal and the battery connecting terminal to switch on or off the flow of the electric current from the electric power connecting terminal to the battery connecting terminal; an electric current detecting unit for detecting the flow of the electric current from the electric power connecting terminal to the battery connecting terminal; a charging control unit for supplying the battery connecting terminal with a pulse-like charging electric current by repeating a step for turning on the first and second switching elements, a step for turning on the first switching element while turning off the second switching element, and a step for turning off the first switching element while turning on the second switching element; and a fault judging unit for judging that at least one of the first and second switching elements is out of order in the case where the electric current detected by the electric current detecting unit is more than an electric current threshold value set for judging if there is the flow of an electric current to the battery connecting terminal during such a period that either one of the first and second switching elements is only turned on by the charging control unit. |
