Battery charger circuit for changing between modes during operation based on temperature and battery voltage and method therefor
First Claim
1. A battery charger circuit comprising:
- a transistor having a first current electrode for receiving a charging voltage, a control electrode for receiving a first control signal, and a second current electrode for providing an output voltage;
a rectifier having a first terminal coupled to said second current electrode of said transistor, and a second terminal coupled to a power supply voltage terminal; and
a control and regulation circuit having a first input for receiving a first feedback signal representative of a temperature, a second input for receiving a second feedback signal representative of a battery voltage, and a first output for providing said first control signal,when the battery charger circuit is coupled to a battery charging source of a first type said control and regulation circuit operating in a linear mode if said temperature is less than a first temperature threshold and in a switching mode otherwise; and
when the battery charger circuit is coupled to a battery charging source of a second type said control and regulation circuit operating in said switching mode if said battery voltage is less than a voltage threshold, and changing from said switching mode to said linear mode if said battery voltage substantially reaches said voltage threshold if said temperature is below said first temperature threshold.
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Accused Products
Abstract
A battery charger circuit includes a transistor having a first current electrode for receiving a charging voltage, a control electrode for receiving a control signal, and a second current electrode for providing an output voltage. The battery charger circuit further includes a rectifier having a terminal coupled to the second current electrode of the transistor, and another terminal coupled to a power supply voltage terminal. The battery charger circuit also includes a control and regulation circuit having an input for receiving a feedback signal representative of a temperature, and an output for providing the control signal. The control and regulation circuit operates in either a switching mode or a linear mode in response to the feedback signal.
23 Citations
20 Claims
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1. A battery charger circuit comprising:
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a transistor having a first current electrode for receiving a charging voltage, a control electrode for receiving a first control signal, and a second current electrode for providing an output voltage; a rectifier having a first terminal coupled to said second current electrode of said transistor, and a second terminal coupled to a power supply voltage terminal; and a control and regulation circuit having a first input for receiving a first feedback signal representative of a temperature, a second input for receiving a second feedback signal representative of a battery voltage, and a first output for providing said first control signal, when the battery charger circuit is coupled to a battery charging source of a first type said control and regulation circuit operating in a linear mode if said temperature is less than a first temperature threshold and in a switching mode otherwise; and when the battery charger circuit is coupled to a battery charging source of a second type said control and regulation circuit operating in said switching mode if said battery voltage is less than a voltage threshold, and changing from said switching mode to said linear mode if said battery voltage substantially reaches said voltage threshold if said temperature is below said first temperature threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification