Methods and systems for battery charging control based on CMOS technology
First Claim
1. A method for controlling the charging of a battery, comprising:
- monitoring a battery voltage;
coupling a supply voltage of a charging control logic to a ground, generating an active low first control signal, inverting said active low first control signal, and charging said battery at a first rate in response to receiving said inverted first control signal, when said battery voltage is below a threshold voltage; and
coupling said supply voltage of said charging control logic to said battery voltage, generating an active high second control signal, and charging said battery at a second rate in response to receiving said active high second control signal, when said battery voltage exceeds said threshold voltage;
wherein said first rate is slower than said second rate.
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Abstract
A method and system, compatible with low-voltage CMOS technology, for controlling the charging of a battery. The method includes monitoring a battery voltage with respect to a threshold voltage. The method further includes coupling a charging control logic supply to ground, generating an active low first control signal, inverting the active low first control signal, and charging the battery at a first rate when the battery voltage is below the threshold voltage. The method further includes coupling the charging control logic supply to the battery voltage, generating an active high second control signal, and charging the battery at a second rate when the battery voltage exceeds the threshold voltage. The first charging rate is slower than the second charging rate. The method further includes supplying battery power to a charger line when the battery voltage exceeds the charger voltage, and suppressing a leakage current.
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Citations
20 Claims
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1. A method for controlling the charging of a battery, comprising:
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monitoring a battery voltage;
coupling a supply voltage of a charging control logic to a ground, generating an active low first control signal, inverting said active low first control signal, and charging said battery at a first rate in response to receiving said inverted first control signal, when said battery voltage is below a threshold voltage; and
coupling said supply voltage of said charging control logic to said battery voltage, generating an active high second control signal, and charging said battery at a second rate in response to receiving said active high second control signal, when said battery voltage exceeds said threshold voltage;
wherein said first rate is slower than said second rate. - View Dependent Claims (2, 3, 4, 5)
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6. A battery charging control apparatus, comprising:
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a charger having a first charging mode and a second charging mode, wherein said first charging mode is slower than said second charging mode;
an external charging circuit coupled between said charger and a battery;
a charging control circuit coupled between said charger and said battery; and
an inverter coupled between said charging control circuit and said external charging circuit;
wherein said charging control circuit includes;
a battery status monitor coupled to said battery, said battery status monitor generating a battery status signal according to a battery voltage, a charging control logic coupled to receive said battery status signal, said charging control logic supplying a first control signal and a second control signal to said external charging circuit, and a power multiplexer coupled to receive said battery status signal, said power multiplexer having a first input coupled to said battery and a second input coupled to a ground, wherein said power multiplexer supplies a battery voltage or said ground to said charging control logic according to said battery status signal;
wherein said first control signal is active low when said battery voltage is below a threshold voltage, and wherein said inverter inverts said first control signal to activate said first charging mode when said battery voltage is below said threshold voltage. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A battery charging control system, comprising
a first charging means for charging a battery; -
a second charging means for charging said battery, wherein said first charging means charges said battery slower than said second charging means;
external switching means for switching between said first charging means and said second charging means;
battery monitoring means for monitoring a voltage of said battery, said battery monitoring means generating a battery status signal;
controlling means for controlling said external switching means, said controlling means generating a first control signal and a second control signal, wherein said first control signal is active low when said battery voltage is below a threshold voltage;
means for inverting said first control signal; and
voltage selection means for supplying a voltage to said controlling means according to said battery status signal, wherein said voltage selection means prevents said charging means from directly supplying a voltage to said controlling means. - View Dependent Claims (17, 18, 19, 20)
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Specification