Methods and systems for battery charging control based on CMOS technology
First Claim
1. A method for protecting a battery charging control circuit implemented with low-voltage CMOS components, comprising:
- (a) detecting a voltage of a battery;
(b) if the battery voltage does not exceed a threshold voltage;
(i) deactivating the battery charging control circuit, and (ii) charging the battery according to a first mode; and
(c) if the battery voltage exceeds the threshold voltage;
(i) activating the battery charging control circuit, and (ii) charging the battery according to a second mode, wherein a second mode charging current exceeds a first mode charging current.
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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
16 Claims
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1. A method for protecting a battery charging control circuit implemented with low-voltage CMOS components, comprising:
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(a) detecting a voltage of a battery;
(b) if the battery voltage does not exceed a threshold voltage;
(i) deactivating the battery charging control circuit, and (ii) charging the battery according to a first mode; and
(c) if the battery voltage exceeds the threshold voltage;
(i) activating the battery charging control circuit, and (ii) charging the battery according to a second mode, wherein a second mode charging current exceeds a first mode charging current. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for protecting a battery charging control circuit implemented with low-voltage CMOS components, comprising:
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means for detecting a voltage of a battery;
means for deactivating the battery charging control circuit when the battery voltage does not exceed a threshold voltage;
first charging means for charging the battery according to a first mode if the battery voltage does not exceed a threshold voltage;
means for activating the battery charging control circuit when the battery voltage exceeds the threshold voltage; and
second charging means for charging the battery according to a second mode, wherein a second mode charging current exceeds a first mode charging current. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification