| US 7,541,777 B2 | ||
| Battery protection circuit | ||
| Itsuki Nakano, Atsugi (Japan); Kazuhiro Ooshita, Atsugi (Japan); and Daisuke Kimura, Atsugi (Japan) | ||
| Assigned to Mitsumi Electric Co., Ltd., Tokyo (Japan) | ||
| Filed on Jan. 30, 2006, as Appl. No. 11/343,735. | ||
| Claims priority of application No. 2005-160140 (JP), filed on May 31, 2005. | ||
| Prior Publication US 2006/0267557 A1, Nov. 30, 2006 | ||
| Int. Cl. H02J 7/00 (2006.01) | ||
| U.S. Cl. 320—134 [320/136] | 5 Claims |
| 1. A battery protection circuit comprising:
an abnormal condition detection circuit including a current detection resistor through which a current flows from a load in
response to a current flowing in the load, said resistor generating a voltage in response to the current flowing in the load,
said abnormal condition detection circuit being able to detect an abnormal condition of a battery according to the voltage
generated by the resistor; and
a control circuit including a detection stop switch configured to control the current flowing in the resistor from the load,
said control circuit being able to turn off the detection stop switch and a protection switch connected between the battery
and the load when the abnormal condition detection circuit detects the abnormal condition, wherein the protection switch and
the detection stop switch are connected in parallel between the battery and the load; wherein
said control circuit includes a logic circuit configured to turn off the detection stop switch after the protection switch
is turned off and to return the detection stop switch to an ON state after returning the protection switch to an ON state
in response to a start of supplying power from the battery to the battery protection circuit.
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