I need to design a power supply to flash-heat a low resistance material to drive off solvents ( say about 30 seconds duration -variable up to 1min ideally). The material impedance is micro-ohm range and drops with rise in temperature. The power required is around 15 - 50Watts (adjustable) and should be constant or, at least, limited. I want the voltage to be low (say under 10Vdc) for safety (ac power might be acceptable). The power should be able to be ramped up over a brief adjustable period to avoid thermal runaway. Anybody got any good ideas?