Radio frequency power generation under power curve constraints

This paper presents an approach to radio frequency (RF) power control along a power curve specified as a function of load impedance, which varies with time. The control algorithm was developed to control the output of electro-surgical generators but can be used in any other application, where for time-varying loads, some specific power, voltage and current limits have to be met. The degree to which this requirement is fulfilled, along with good transient responses to time-varying impedance, determines the quality of the RF power delivered. In this paper, we present simulation results of a control algorithm developed for an electro-surgical generator. We discuss only one mode of operation the cut mode. This control algorithm has already been tested with the real hardware and its operation is very close to the simulation results.