Inverter device attenuating in-phase harmonic components of an o

Details Inverter device attenuating in-phase harmonic components of an o Inverter device attenuating in-phase harmonic components of an o

1991-10-16

1995-06-06

Sterrett, Jeffrey L.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 17, 363132, H02M 112

Patent

active

054227658

ABSTRACT:
An inverter device receives a D.C. power source as an input and performs a switching operation at a single frequency in response to a preset driving signal (Vg1, Vg2, Vg3, Vg4) to produce an A.C. voltage. A transmission transformer (CH) having two coils which have the same inductance and are magnetically closely coupled with each other is provided and the two coils (CH1, CH2) are connected with the same polarities to respective ones of one set of lines for transmitting the A.C. voltage. The impedance of the transmission transformer (CH) is so small that it is negligible with respect to a normal A.C. voltage of a positive phase mode. A harmonic voltage is in an in-phase mode and the transmission transformer (CH) exhibits an extremely high impedance with respect to the harmonic voltage, and thus prevents the creation of a current path. As a result, the waveform distortion of a voltage applied between the drain and source of MOS transistors (FET1, FET2, FET3, FET4) is reduced and the peak value is reduced.

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