Performance study of current-controlled versus voltage-controlled radio frequency power generator at low sampling frequency

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 electrosurgical generator s but can be used in any other application, where for time-varying loads, some specific power, voltage and current limits have to be met. Such generators may be voltage-controlled or current-controlled. The principle of voltage control was introduced in the previous paper. In this paper, we present and compare simulation results of both principles of control. In particular, we discuss their suitability for operation at low sampling frequencies. These control algorithms, developed for an electrosurgical generator, have already been tested with the real hardware and their operation is very close to the simulation results.