Charging current control method and charging system
First Claim
1. 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).
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Accused Products
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.
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Citations
12 Claims
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1. A charging current control method, for controlling a charging IC to supply a corresponding charging current to a battery, comprising the steps of:
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(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). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A charging system, for using a charging IC to supply a corresponding charging current to a battery, comprising:
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a battery status detection unit, coupled to the battery, for producing a detected current and a regular current of the battery; a control unit, coupled to the battery status detection unit, for receiving the detected current and the regular current, generating a PWN signal with a duty cycle, and providing a PWM signal with a duty cycle greater than the previous duty cycle by a default increased cycle, when the control unit determines that the detected current of the battery has not reached the regular current; and a filter unit, coupled to the charging IC and the control unit, for receiving the PWM signal generated by the control unit, converting the PWM signal into a corresponding a voltage, and supplying the voltage to the charging IC. - View Dependent Claims (9, 10, 11, 12)
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Specification