Method and device for controlling the working points of a series-resonant-circuit inverter

摘要

A method and a device may be used for controlling the working points of a series-resonant-circuit inverter. The frequency of the inverter is controlled as a manipulated variable in dependence upon a defined phase-angle system deviation in such a way that a determined phase-angle actual value of a measurable state variable of the load circuit, whose phase-frequency characteristic has a monotonically falling curve, corresponds to a specifiable phase-angle setpoint value. Thus, a method and a device are implemented for controlling the working points of a series-resonant-circuit inverter, by which means the operating range prescribed for the series-resonant-circuit inverter is detected and kept stable independently of parameter fluctuations of the resonant circuit elements.