A higher power op-amp circuit would do this same thing. I've never used
your H-Bridge configuration.
An op amp that can handle + - 40 volts or so at 100 ma or so would handle
this easily, but you could use a standard op amp at hooked up at +/- 15
volts or so feeding a pair of output buffer transistors that are hooked up
to a higher voltage.
This is a standard audio power amp configuration. The only difference is
that you are working at essentially D.C. voltages, which makes it a lot
easier.
Is this enough info to get you started??
Rex
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