I'm trying to design a very low power (<=10W) inductive heating circuit that will heat the work material to 40-50degC. I've seen plenty of Royer Oscillator circuits online (see here: http://www.rmcybernetics.com/images/induction-heater-schematic.jpg) but how can the temperature output be configured in the circuit? Also, I want to make the power draw as low as possible. What are some parameters I can play with to achieve these design constraints?