Voltage mode, high accuracy battery charger
AssigneeO2Micro International Limited
InventorConstantin Bucur
Life of this patent
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Abstract
A voltage mode battery charging system is provided that includes a battery current control section, a battery voltage control section, and a power control section. The battery current control section and battery voltage control section each generate signals indicative of the battery charging current and battery voltage, respectively. The power control section generates a signal indicative of the power available from an adapter source. Each of these signals is combined at common node, and if any of these sections exceeds a threshold, battery charging current is decreased.
Claims18
A circuit for controlling the duty cycle of a PWM signal, comprising:
- a battery current control section generating a current control signal proportional to an amount a battery charging current exceeds a predetermined battery charging current threshold;
- a battery voltage control section generating a voltage control signal proportional to an amount a battery voltage exceeds a predetermined battery voltage threshold;
- and
- a comparator generating a PWM signal based on the amplitude of said current control signal and/or said voltage control signals.
A method for controlling the duty cycle of a PWM signal, comprising:
- generating a current control signal proportional to an amount a battery charging current exceeds a predetermined battery charging current threshold;
- generating a voltage control signal proportional to an amount a battery voltage exceeds a predetermined battery voltage threshold;
- and
- generating a PWM signal based on the amplitude of said current control signal and/or said voltage control signals.
Dependencies are inferred from the claim text.