Circuit and method for battery charging and discharging protection
First Claim
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1. A battery protection system for charging a battery at different voltages contingent upon a discharge level of said battery, comprising:
- a first transistor and a first diode providing a charge path for said battery to be charged by a voltage source;
a second transistor and a second diode providing a discharge path for said battery; and
a protector IC configured to open and close both the charge path and the discharge path; and
a power management unit configured to;
determine if an output voltage of said battery is less than a discharge threshold voltage, and upon such a determination;
determine if the discharge path is closed, and upon such a determination charge said battery with a normal charging voltage; and
determine if the discharge path is open, and upon such a determination charge said battery using a trickle charge.
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Abstract
A method to detect the presence of battery protection circuits in any battery powered product. The major advantage of the method is to make the battery voltage very smooth during the charging process. The proposed circuit can give a good prediction of protection switching turn on time. This can provide the battery powered system work smoothly by avoiding any battery voltage discontinuity. The proposed invention addresses the issue of deep discharge and provides a solution through a discharge test procedure.
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Citations
16 Claims
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1. A battery protection system for charging a battery at different voltages contingent upon a discharge level of said battery, comprising:
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a first transistor and a first diode providing a charge path for said battery to be charged by a voltage source; a second transistor and a second diode providing a discharge path for said battery; and a protector IC configured to open and close both the charge path and the discharge path; and a power management unit configured to; determine if an output voltage of said battery is less than a discharge threshold voltage, and upon such a determination; determine if the discharge path is closed, and upon such a determination charge said battery with a normal charging voltage; and determine if the discharge path is open, and upon such a determination charge said battery using a trickle charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method to charge a battery, comprising:
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comparing an output voltage of the battery to a discharge threshold voltage; upon a determination that the output voltage is less than the discharge threshold voltage, performing a battery discharge test, wherein the battery discharge test determines if a discharge path configured to discharge the battery is closed to permit discharging or open to prevent discharging; upon a determination that the discharge path is closed, charging the battery with a normal charging voltage; and upon a determination that the discharge path is open, charging the battery using a trickle charge. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification