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Circuit and method for battery charging and discharging protection

  • US 7,675,269 B2
  • Filed: 11/03/2006
  • Issued: 03/09/2010
  • Est. Priority Date: 11/03/2006
  • Status: Expired due to Fees
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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