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Method and electronic circuit for efficient battery wake up charging

  • US 8,350,534 B2
  • Filed: 07/19/2009
  • Issued: 01/08/2013
  • Est. Priority Date: 09/21/2000
  • Status: Expired due to Fees
First Claim
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1. A wake up charging circuit for providing a wake up charging current to a battery, said wake up charging circuit comprising:

  • a signal processing circuit for receiving a first predetermined reference signal and a voltage sensing signal indicating a voltage of said battery, and for generating an output signal according to said first predetermined reference signal and said voltage sensing signal;

    a comparison circuit coupled to said signal processing circuit for comparing said output signal to a second predetermined reference signal, and for generating a wake up control signal to control said wake up charging current; and

    an error amplifier for receiving said wake up control signal and a current sensing signal indicative of said wake up charging current and for generating an error signal to maintain said wake up charging current at a level based on said wake up control signal.

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