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System for detecting battery voltage with high precision

  • US 20070145955A1
  • Filed: 10/27/2006
  • Published: 06/28/2007
  • Est. Priority Date: 12/26/2005
  • Status: Abandoned Application
First Claim
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1. A system for detecting a battery voltage with high precision, which is applied to a handheld device having a battery and a voltage detection chip for detecting battery voltage of said battery, comprising:

  • a first capacitor for filtering a high-frequency power noise of said battery voltage, where one end of said first capacitor is connected between said voltage detection chip and said battery;

    a second capacitor for lowering a larger instant fluctuation of said battery voltage, where one end of said second capacitor is connected between said one end of said first capacitor and said battery; and

    a resistor for reducing power noises at different frequencies, where said resistor is connected between said one end of said second capacitor and said battery;

    wherein said first capacitor, said second capacitor and said resistor form a RC filter circuit.

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