Using op-amps, we can drive an H-bridge configuration of MOSFETs to deliver more efficient DC output to our device of choice.
Don't ask me where the +170VDC comes from to power the op-amps to begin with...
I would *guess* that you *could* power them from the output of the device itself, but, I can't guarantee that it'll hit some state where enough current leaks though to begin a cascade positive feedback amplification to kickstart itself 🤷🏻♂️
Possibly use some high value resistors in series with some regular diode bridge rectifier, just to kickstart the op-amp's 🤷🏻♂️