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battbal.htm
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<HTML>
<HEAD>
<TITLE>Battery Balancer for Electric Vehicles</TITLE>
<META NAME="DC.title" CONTENT="Battery Balancer for Electric Vehicles">
<META NAME="DC.creator" CONTENT="John Honniball">
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<META NAME="geo.placename" CONTENT="Stoke Gifford, South Gloucestershire, United Kingdom">
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<META NAME="keywords" CONTENT="electric vehicle, lead acid battery, charging, protection, cell protection, equalisation">
<META NAME="author" CONTENT="John Honniball">
<META NAME="description" CONTENT="Battery Balancer for Electric Vehicles using quad comparator chip">
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<H1 ALIGN=CENTER>Battery Balancer for Electric Vehicles</H1>
</FONT>
<A HREF="index.htm">HOME</A> > <A HREF="make.htm">Creative Technology</A> > <B>Battery Balancer</B>
<P>
<DIV ALIGN=CENTER>
<B>PAGE UNDER CONSTRUCTION</B>
</DIV>
</P>
<P>
In connection with my interest in electric vehicles, I have a need for a battery
balancing circuit.
But first, I should explain what battery balancing and protection is all about.
...
The usual way to do this is by sensing the battery's terminal voltage and
switching in a resistor to bypass the charging current.
<H2>Undervoltage Protection</H2>
Voltage too low => switch on LEDs.
</P>
<DIV ALIGN=CENTER>
<A HREF="battbal1b.png"><IMG SRC="battbal1.png" WIDTH=150 HEIGHT=100 ALT="Battery balancer schematic"></A>
<A HREF="rescont2b.jpg"><IMG SRC="rescont2.jpg" WIDTH=150 HEIGHT=100 ALT="Resistor controller"></A>
<A HREF="rescont3b.jpg"><IMG SRC="rescont3.jpg" WIDTH=150 HEIGHT=100 ALT="Resistor controller"></A>
</DIV>
<P>
</P>
<HR>
<H2>Overvoltage Protection and Balancing</H2>
<P>
Voltage too high => switch in shunt resistor
</P>
<P>
</P>
<DIV ALIGN=CENTER>
<A HREF="mosfetpwm1b.jpg"><IMG SRC="mosfetpwm1.jpg" WIDTH=150 HEIGHT=100 ALT="MOSFET PWM breadboard"></A>
<A HREF="mosfetpwm2b.jpg"><IMG SRC="mosfetpwm2.jpg" WIDTH=150 HEIGHT=100 ALT="MOSFET PWM construction"></A>
<A HREF="mosfetpwm3b.jpg"><IMG SRC="mosfetpwm3.jpg" WIDTH=150 HEIGHT=100 ALT="MOSFET PWM complete"></A>
</DIV>
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Copyright © 2007
by <A HREF="eee.htm">John Honniball</A>.
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