Battery protecting circuit
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United States of America Patent
Stats
-
Sep 9, 2008
Grant Date -
Nov 16, 2006
app pub date -
May 16, 2006
filing date -
May 16, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
This invention provides a battery protecting circuit where even if the battery voltage falls nearly to zero volts due to overdischarge or the like while an NMOS transistor set in the power feeding path on the side of the positive electrode of the battery is turned ON/OFF, it is still possible to charge the battery by a constant charging current in a stable way. When the voltage of battery B1 has not reached the voltage needed for generating the driving voltage of NMOS transistors Q1, Q2 in drives 111, 112, the boosting operation of drives 111, 112 is stopped, and PMOS transistor Q3 inserted in a power feeding path different from that of said transistors is turned ON by driver 113. In driver 113, by clamping voltage VDD generated in the power feeding path of PMOS transistor Q3 to a voltage lower than it, driving voltage ZVO of PMOS transistor Q3 is generated without performing a boosting operation.
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