I'm looking to design a power supply that, given 24V input, can deliver +/- 0-12V output at 3A. It will be used to drive a Peltier module in either heating or cooling mode, which is why it must be bipolar. Here's an example of a commercial device that does this (but I don't know what circuit they used).
Is there a specific circuit that is known to be good for this application? Can/should I just feed the output of a standard buck converter into an H-bridge to allow inverting the voltage?