Electrical load generation circuit for e.g. heaters of building generates pulse-width modulated rectangular voltage and connects poles of generator via serial load resistance dependent on rectangular voltage

摘要

The circuit includes a voltmeter arrangement (8) that measures the actual voltage at the two poles (2) of a generator (1). A controller (16) generates a control voltage dependent on a comparison of the actual voltage with a predetermined or set desired voltage. A pulse width modulator (27) generates a pulse-width modulated rectangular voltage based on a high frequency voltage. The rectangular voltage generation dependents on a control signal that correlates with the control voltage. A transistor (35) connects both poles of the generator via a serial load resistance (40) dependent on the rectangular voltage.