Step-up battery charging management system and control method thereof
First Claim
1. A battery charger, comprising:
- a) a step-up converter configured to generate an output signal by boosting a DC input voltage, wherein a threshold voltage is greater than said DC input voltage;
b) a charging control circuit configured to receive said output signal from said step-up converter, and to control charging of a battery;
c) said charging control circuit being configured to regulate said output signal by a power transistor operating in a linear region to maintain a charging current for said battery charging as a trickle current when a battery voltage is less than said threshold voltage, wherein said power transistor is coupled between said step-up converter and said battery; and
d) said charging control circuit being configured to charge said battery directly by said output signal by said power transistor operating in a saturation region when said battery voltage is greater than said threshold voltage.
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Abstract
In one embodiment, a battery charger can include: (i) a step-up converter configured to generate an output signal by boosting a DC input voltage, where a threshold voltage is greater than the DC input voltage; (ii) a charging control circuit configured to receive the output signal from the step-up converter, and to control charging of a battery; (iii) the charging control circuit being configured to regulate the output signal to maintain a charging current for the battery charging as a trickle current when a battery voltage is less than the threshold voltage; and (iv) the charging control circuit being configured to charge the battery directly by the output signal when the battery voltage is greater than the threshold voltage.
9 Citations
20 Claims
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1. A battery charger, comprising:
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a) a step-up converter configured to generate an output signal by boosting a DC input voltage, wherein a threshold voltage is greater than said DC input voltage; b) a charging control circuit configured to receive said output signal from said step-up converter, and to control charging of a battery; c) said charging control circuit being configured to regulate said output signal by a power transistor operating in a linear region to maintain a charging current for said battery charging as a trickle current when a battery voltage is less than said threshold voltage, wherein said power transistor is coupled between said step-up converter and said battery; and d) said charging control circuit being configured to charge said battery directly by said output signal by said power transistor operating in a saturation region when said battery voltage is greater than said threshold voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling charging of a battery, the method comprising:
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a) boosting, by a step-up converter, a DC input voltage to generate an output signal configured to charge a battery; b) comparing, by a comparator, a battery voltage against a threshold voltage, wherein said threshold voltage is greater than said DC input voltage; c) regulating, by a power transistor operating in a linear region, said output signal to maintain a battery charging current to be a trickle current when said battery voltage is less than said threshold voltage, wherein said power transistor is coupled between said step-up converter and said battery; and d) charging, by said power transistor operating in a saturation region, said battery directly by said output signal when said battery voltage is greater than said threshold voltage. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification