Charging control circuit

摘要

A charging control circuit includes a charging module, a switch element, a load detecting element, and an adjusting element. According to the power consumption of a chargeable battery of an electronic device, the load detecting element issues a load range signal. According to the load range signal, the adjusting element issues a control voltage to the switch element. According to the control voltage, the switch element is turned on, and the magnitude of a control current from the switch element is correspondingly adjusted. By the charging module, a charging current corresponding to the control current is provided to charge the chargeable battery. Consequently, the magnitude of the charging current is controlled according to the operating situation of the electronic device, and the charging speed is changed.

主权项

1. A charging control circuit installed in an electronic device and connected with a chargeable battery of the electronic device for charging the chargeable battery, the charging control circuit comprising:
a charging module connected with the chargeable battery, and providing a charging current to the chargeable battery so as to charge the chargeable battery; a switch element connected with the charging module, wherein when the switch element is turned on, a control current is outputted from the switch element to the charging module; a load detecting element connected with the chargeable battery, wherein the load detecting element issues a load range signal according to a voltage drop of the chargeable battery; and an adjusting element connected with the switch element and the load detecting element, wherein the adjusting element issues a control voltage to the switch element according to the load range signal, so that a magnitude of the control current from the switch element is correspondingly adjusted, wherein as the voltage drop increases, the charging current increases.