Stepped wave synthesis from pre-programmed PWM inverters with common DC-DC converter supply

Stepped waveform inverters have the advantages of low harmonic distortion of voltage compared to the ideal sinusoidal waveform. This paper presents a new concept in the realisation of stepped output waveforms by combining, directly, the outputs of several PWM inverters, each fed from the isolated windings of a high frequency DC-DC power converter. The output waveform is optimised to achieve a minimum THD with a given number of switches, operating in any suitable combination of full- or half-bridge inverters. Details regarding the study of such combinations, including experimental verification, is described in the paper.

[1]  R. G. Hoft,et al.  Principles of inverter circuits , 1985 .

[2]  Fujio Kurokawa,et al.  Precise regulation of multiple output voltages in a dc-dc converter , 1980, 1980 IEEE Power Electronics Specialists Conference.

[3]  J. Appelbaum,et al.  Stepped Voltage Dc/Ac Inverter -- Part II: Optimal Construction Of Waveforms By Means Of Discrete Levels , 1977, IEEE Transactions on Industrial Electronics and Control Instrumentation.

[4]  B. Basak,et al.  A low distortion inverter without low-frequency magnetics for UPS application , 1995, Proceedings of 1995 International Conference on Power Electronics and Drive Systems. PEDS 95.

[5]  J. Appelbaum,et al.  Stepped Voltage Dc/Ac Inverter --Part I: Analysis , 1977, IEEE Transactions on Industrial Electronics and Control Instrumentation.