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CHARGE AND DISCHARGE CONTROL CIRCUIT AND BATTERY DEVICE

  • US 20150333555A1
  • Filed: 05/13/2015
  • Published: 11/19/2015
  • Est. Priority Date: 05/14/2014
  • Status: Active Grant
First Claim
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1. A charge and discharge control circuit, comprising:

  • a control circuit configured to detect a voltage and abnormality of a secondary battery; and

    a short-circuit and overcurrent detecting circuit configured to detect an overcurrent and a short circuit based on a voltage of an overcurrent detecting terminal,the short-circuit and overcurrent detecting circuit comprising;

    a reference voltage circuit comprising a constant current circuit, a first impedance element, and a transistor having a resistance value that is changed depending on the voltage of the secondary battery, the reference voltage circuit being configured to output a voltage generated when a current of the constant current circuit flows through the first impedance element and the transistor;

    a first comparator circuit configured to compare the voltage of the overcurrent detecting terminal with the voltage of the reference voltage circuit;

    a second impedance element including one terminal connected to the overcurrent detecting terminal;

    a third impedance element including one terminal connected to another terminal of the second impedance element; and

    a second comparator circuit configured to compare a voltage generated at a node of the second impedance element and the third impedance element with the voltage of the reference voltage circuit.

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