| 摘要 |
A battery charging circuit includes a power supply circuit being connected via a switching element and a current-limiting resistor to a battery to subject the battery to a trickle charge, and a control circuit turning on and off the switching element on a given duty to subject the battery to the trickle charge by means of a pulsed charge. The control circuit includes an on-timing adjustment circuit detecting a battery voltage to control the duty of turning on and off the switching element. The on-timing adjustment circuit makes a duty ratio smaller in a state of a low battery voltage than in a state of a high battery voltage and turns on and off the switching element to perform the trickle charge by means of the pulsed charge. |
