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Protection Circuit And Electronic Device

  • US 20110205678A1
  • Filed: 02/16/2011
  • Published: 08/25/2011
  • Est. Priority Date: 02/24/2010
  • Status: Active Grant
First Claim
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1. A protection circuit that is used with a power supply that produces charging power, and a storage battery for which normal operation is conditional upon a terminal voltage being less than or equal to a maximum voltage, comprising:

  • a first switch disposed to a first path that electrically connects the storage battery and the power supply;

    a second path that electrically connects the storage battery and a load;

    a voltage detection circuit that detects a terminal voltage of the storage battery;

    an over-charge detection circuit that monitors the storage battery terminal voltage and controls the first switch to turn off when the terminal voltage is detected to exceed the maximum voltage; and

    a control circuit that controls the monitoring operation interval of the over-charge detection circuit according to the terminal voltage of the storage battery detected by the voltage detection circuit.

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