[techhelpbb]

Originally Posted by Matt Krass

The configuration I had in mind was a Jaguar running forward, bringing it's load node up high to +12V, and the Victor running reverse, bringing it's load node down to 0V, so that current flows:



In this configuration, both active legs see a stable constant current load, so both get a complete work out. Halfway through the test I'd flip the directions and work the other legs just as hard. Since the loss in the FETs are resistive and related to current, we'd only need constant current, not constant power, so the declining battery voltage is not necessarily a problem.

If my description still doesn't make sense, I can draw it up really quick and see if that makes more sense. The idea is the load current passes through both legs of both bridges while the FETs are monitored.

The problem with a consistent load is that resistors heat up and change resistance, and other components have similar temperature dependence. However I have not (yet) done the math to see if this variance is enough to warrant the trouble of a dynamic load. Perhaps it isn't necessary, though I agree I'd not want to use a digital controller to regulate the load, merely to program an analog feedback loop to regulate it due to bandwidth concerns.

Matt

I see what you're thinking but be careful, I'm thinking the Jaguars don't entirely work like that in the off part of the cycle.