METHOD AND VOLTAGE CONVERTER FOR CONVERTING A D.C. INPUT VOLTAGE TO AN A.C. VOLTAGE IN THE MAINS FREQUENCY RANGE

摘要

The invention relates to a method for generating, from a DC input voltage (UE), an AC voltage (UA) in the system frequency range, which method is characterized in that two opposite-pole, pulse-width modulated rectangular pulses (a, b) having a high switching rate are applied to the primary windin g (W1) of a transmitter (UET), every pulse being modulated corresponding to a half-wave of the AC voltage to be generated. On the secondary side, the impulses of both pulses are rectified so that only one pulse (d) from impuls es of one polarity remains which due to their pulse width modulation correspond to subsequent half-waves of the AC voltage to be generated. The pulse so obtained is periodically commutated with the double frequency of the AC voltage to be generated so that a pulse (e) is obtained that is pulse-width modulated with respect to amplitude, frequency and polarity of the AC output voltage.