US 8,710,803 B2 · Charging current control method and charging system

Abstract

A charging method and a charging system are introduced for controlling a charging current by a PWM method. A charging IC is controlled to supply the charging current to a battery, and a control unit is used to generate a PWM signal with a duty cycle, and a filter unit is used to convert the PWM signal into a voltage signal to be supplied to the charging IC, and the control unit determines whether a current of a battery detected by the battery status detection unit reaches a regular current, so that a PWM signal with a duty cycle greater than the previous duty cycle by a default increased cycle is provided if the detected current has not reached the regular current. Thus, the feature of the PWM signal is used to set the charging current according to the capacity of the battery automatically.

Claims12

Dependent claims

A charging current control method, for controlling a charging IC to supply a corresponding charging current to a battery, comprising the steps of:

(A) providing a PWM signal with a duty cycle;
(B) converting the PWM signal with the duty cycle into a corresponding voltage and supplying the voltage to the charging IC, so that the charging IC supplies the corresponding charging current to the battery according to the voltage;
(C) obtaining a detected current and a regular current of the battery;
(D) determining whether the detected current of the battery has reached the regular current;
if yes, ending the adjustment of the charging current, or else entering into Step (E);
and
(E) returning to the Step (A), and providing a PWM signal with a duty cycle higher a default increased cycle in the Step (A).

4 more elements

Dependencies are inferred from the claim text.

Charging current control method and charging system

Life of this patent

Charging current control method and charging system

Life of this patent

Abstract

Claims12