Reducing switching losses in series connected bridge inverters a

Details Reducing switching losses in series connected bridge inverters a Reducing switching losses in series connected bridge inverters a

1996-08-16

1998-03-31

Krishnan, Aditya

Electric power conversion systems

Current conversion

Using semiconductor-type converter

H02M 7515

Patent

active

057345651

ABSTRACT:
A staggered-frequency AC inverter includes at least first and second pulse width modulated bridge circuits connected in series. The first bridge circuit receives a DC voltage and operates at a first pulse width modulated switch frequency to generate a first output corresponding to a first region of the AC signal. The second bridge circuit receives a DC voltage and operates at a second pulse width modulated switch frequency substantially lower than the first frequency. The second bridge circuit generates a second output corresponding to a second region of the AC signal in which the AC signal changes less rapidly than in the first region, minus a maximum voltage magnitude of the first region. Another aspect of the invention features a staggered-voltage multiple-phase circuit having at least a first-phase portion for generating a voltage signal in a first phase, and a second-phase portion for generating the voltage signal in a second phase. Each phase portion includes a first circuit that generates a first output corresponding to a plurality of segments of the voltage signal minus a corresponding plurality of constant values, and a second circuit connected in series with the first circuit that generates a second output corresponding to at least some of the plurality of constant values. Independent and isolated power supplies are connected to each first and second circuit in each of the first-phase and second-phase portions. Alternatively, an output transformer having first and second independent and isolated primary coils is connected to respective outputs of the first-phase and second-phase portions.

REFERENCES:
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Lai, Jih-Sheng and Peng, Fang Zheng; "Multilevel Converters--A New Breed of Power Converters"; Conference Record of 1995 IEEE Industry Applications Conference 30th IAS Annual Meeting; Oct. 8-12, 1995; pp 2348-2356.
Mueller, Otward M. and Park J.N.; Quasi-Linear IGBT Inverter Technologies; Conference Proceedings of the Ninth Annual APEC Conference; 0-7803-1456-5/94 IEEE; 94CH3364-7; Feb. 13-17, 1994, pp. 253-259.
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