Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1998-06-19
1999-09-07
Wong, Peter S.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363136, 363 98, H02M 75387, H02M 521
Patent
active
059496690
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a low-loss power inverter.
BACKGROUND INFORMATION
For many years, resonant power converters have been increasingly used for drive engineering as an alternative to a conventional the traditional voltage-applying pulse-width-modulation inverters. Their purpose is to drastically reduce switching losses and optimally utilize the ensuing advantages--higher power density and higher operating frequency. Furthermore, semiconductors can switch higher currents because of the lower load during switching operations, thus permitting higher utilization of capacity.
Disadvantages include, in some cases, a considerable increased expense for active and passive components which must be added to shape the voltage and current characteristics appropriately during switching operations. In some cases higher peak currents and voltages occur on the switching elements. Additionally, completely different control methods than in the past must be used in some resonant power converters.
A power converter having only minor restrictions compared to other circuits is known as an auxiliary resonant commuted-pole (ARCP) power converter. In an ARCP power converter, the peak loads that occur on the switching elements are not higher than in a pulse-width-modulation inverter, and the conventional control methods can be used and need only be adapted with regard to dead times and minimum pulse periods. The increased expense in terms of components and control electronics is moderate and must be considered in relation to the advantages that can be achieved, optionally also in comparison with traditional balancing networks.
An article entitled "The auxiliary resonant commutated pole converter" by R. W. De Doncker et al., IEEE-IAS Conference Proceedings 1990, pp. 1228-35, describes an operation of an ARCP converter. In such an ARCP converter, a resonant capacitor is connected in parallel with each power semiconductor switch. Furthermore, an auxiliary circuit including an auxiliary switch which is connected in series with a resonant inductor is provided, connecting a neutral point of an indirect d.c. link capacitor to an output terminal of the converter phase. Two semiconductor switches with antiparallel diodes are provided as auxiliary switches; they are connected in series so that their cathodes, emitters and source terminals are linked together. The semiconductor switches used may be SCRs (symmetrically blocking thyristors), GTOs (gate turn-off thyristors), ZTOs or MCTs (MOS-controlled thyristors). The power semiconductor switches provided may be GTOs (gate turn-off thyristors), MCTs (MOS-controlled thyristors), IGBTs (insulated gate bipolar transistors) or PTRs (power transistors).
When power is to be supplied to high-power three-phase loads, e.g., three-phase machines in the MW range using self-commutated rectifiers, phase-to-phase voltage in the high-voltage range is demanded. To meet this demand at the current level of semiconductor technology, semiconductor components may have to be connected in series.
An article entitled "Series connection of IGBTs in resonant converters," by M. Dehmlow et al., IPEC Yokohama '95, pp. 1634-38, describes a resonant converter. Each of the resonant converter's, bridge branch valves includes a series connection of three IGBTs. Each power switch is provided with a resonant capacitor.
The expanded three-phase bridge connection is an advantageous option for a series connection of two components per bridge branch. With this circuit, the voltage of the a.c. terminals with respect to terminal 0 may assume the three values +U.sub.d /2, zero, and -U.sub.d /2. Therefore, this is also called a self-commutated three-point power converter or three-point power inverter.
SUMMARY OF THE INVENTION
An object of the present invention is to create a power inverter with low-loss switching of its power semiconductor switches.
A design of a three-point inverter phase is obtained due to the fact that for each inverter phase connected in parallel with a d.c. intermediate cir
REFERENCES:
patent: 4203151 (1980-05-01), Baker
patent: 4523269 (1985-06-01), Baker et al.
patent: 4881159 (1989-11-01), Holtz et al.
"Novel Snubberless Three-Level GTO Inverter with Dual Quasi-Resonant DC-link," Wan Yi et al., 24th Annual IEEE Power Electronics Specialists Conference, Seattle, Jun. 20-25, 1993, pp. 880-884.
"Wide Load Range Three-Level ZVS-PWM DC-to-DC Converter," J. Renes Pinheiro et. al., 24th Annual IEEE Power Electronics Specialists Conference, Seattle, Jun. 20-25, 1993, pp. 171-177.
"The Auxillary Resonant Commutated Pole Conveter," R. W. De Doncker et al., IEEE-IAS Conference Proceedings, 1990, pp. 1228-1235.
"Series Connection of IGBTs in Resonant Converters," M. Dehmlow et al., IPEC-Yokohama, 1995, pp. 1634-1638.
"The Auxiliary Quasi-Resonant DC Link Inverter," R. W. De Doncker et al., IEEE Power Electronics Specialists Conference, 1991, pp. 248-253.
"Soft-switching Power Conversion," J. B. Klaassens et al., EPE Journal, vol. 3, No. 3, Sep. 1993, pp. 155-166.
"A Low-expenditure Thyristor Three-Level Inverter with Small Lossess," B. Fuld, vol. 11, No. 8, 1989, pp. 261-265.
"Principles for the Development of a Control Process for GTO-Three Step Inverters for Traction Drives," J. K. Steinke, vol. 10, No. 7, 1988, pp. 215-220.
Bruckmann Manfred
Mertens Axel
Patel Rajnikant B.
Siemens Aktiengesellschaft
Wong Peter S.
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