Re: Electronic load advice
- From: mkaras <mkaras@xxxxxxxxxxxxxxxxxxx>
- Date: Sat, 2 Feb 2008 21:34:33 -0800 (PST)
On Feb 2, 5:46 pm, Richard Henry <pomer...@xxxxxxxxxxx> wrote:
I need to test some battery packs. We predict the load of the target
product will cycle from high power (80 W for 10 ms) to low power (5 W
for 240 ms) during operation. I would like to simulate that load
including the dynamics in the battery test. I have found a few loads
for rent at Electrorent, but before I commit, does anyone have some
suggestions? Precautions?
You can make a nice load by placing a power N-FET on a heat sink. Wire
the source to ground through a resistor with a small ohms value. Drive
the gate of the N-FET with an opamp and the inputs from a voltage
source (IN+) and the other input (IN-) from the feedback at the
resistor source connection. This makes a nice voltage controlled
current sink that sinks from the drain of the N-FET. If the opamp is a
dual it is easy to use the other half to make a voltage scaler such
that control voltage can be a larger range than the actual voltage
applied to the IN+ of the first opamp. For higher power applications
put a heat sink fan over the N-FET.
ciscodsl
.
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- Electronic load advice
- From: Richard Henry
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