Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1981-09-14
1982-08-10
Shoop, William M.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
307107, H02M 112
Patent
active
043441238
ABSTRACT:
The multilevel inverter includes a voltage divider which when connected across a dc source E.sub.D, provides voltage at terminals having values between +E.sub.D to -E.sub.D. A first and a second set of thyristors pairs are connected between the positive or negative terminals, respectively, and a load terminal for applying selected voltage levels to the load. Any thyristor pair in these sets may be turned-off by firing the thyristor pair at the next highest voltage level. However, the main thyristors which are connected to the +E.sub.D or -E.sub.D terminal is turned-off by a commutation circuit. This circuit includes a single capacitor maintained at zero voltage and subjected to an oscillating voltage during the commutation cycle to turn-off the conducting main thyristor. Such an inverter can easily provide a waveform having a series of pulses at one or more voltage levels thereby eliminating harmonics in the output.
REFERENCES:
patent: 1691986 (1928-11-01), Nyquist
patent: 3100851 (1963-08-01), Ross et al.
patent: 3324374 (1967-06-01), Corey
patent: 3932798 (1976-01-01), Chalmers et al.
patent: 4047083 (1977-09-01), Plunkett
patent: 4135235 (1979-01-01), Baker
"Generalized Techniques of Harmonic Elimination and Voltage Control in Thyristor Inverters: Part II-Voltage Control Techniques," Hasmukh Patel & Richard Hoft, IEE Transactions on Industry Applications, vol. 1A-10, No. 5, Sep./Oct., 1974.
"Methods for Optimizing the Waveform of Stepped-Wave Static Inverters," Philip D. Corey, Reprinted from Paper 62-1147, Presented at the AIEE Summer General Meeting, Jun. 17, 1962.
Bhagwat Pradeep
Stefanovic Victor R.
Canadian Patents & Development Limited
Rymek Edward
Shoop William M.
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