| 摘要 |
PROBLEM TO BE SOLVED: To prevent efficiency from being degraded due to heat from the resistance component of a current fuse by avoiding use of the current fuse and using the resistance value of a switching element, when it is at on state to detect an abnormal charging current. SOLUTION: With a switch element 16 for controlling discharging current contained in the detection voltage block in an abnormal charging current detection circuit 11, the resistance value of the switching element differs by 10 digits or more on the same charging current, depending on whether the switching element 16 for controlling discharging current is on or off. Therefore, the voltage produced in the detection voltage block in the abnormal charging current detection circuit 11 differs significantly. Abnormal charging current detection voltage is fixed by having an abnormal charging current detected only when the switching element 16 for controlling discharging current is on. As a result, heating from extra resistance components such as current fuse is eliminated, and the discharging efficiency is improved.
|
