Patent ID: 8633782

Claim:
A system for delivering power to a dynamic load, comprising: a power supply providing DC power having a substantially constant power open loop response; a power amplifier for converting the DC power to RF power, the power amplifier having a frequency set point; a sensor for measuring voltage, current and phase angle between voltage and current vectors associated with the RF power; an electrically controllable impedance matching system to modify the impedance of the power amplifier to at least substantially match an impedance of a dynamic load; and a controller comprising: a) a frequency control loop for controlling the frequency set point of the power amplifier based on a comparison of a conductance set point with a conductance value that is measured between the power amplifier and the dynamic load, and b) an impedance control loop that controls the electrically controllable impedance matching network such that susceptance and not conductance changes between the power amplifier and the dynamic load when the impedance of the power amplifier changes.