Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1986-02-25
1987-06-02
Salce, Patrick R.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 98, 363132, H02H 7122
Patent
active
046708286
ABSTRACT:
Bi-directional switches for use with neutral point clamped PWM inverters have utilized clamping switches which are operated alternately with main power switches in the inverter to periodically connect an output terminal of the inverter to a neutral voltage. However, a delay period is typically interposed between turn-off of a main power switch and turn-on of the clamping switch to minimize the possibility of a potentially destructive shoot-through condition. This delay adversely affects the quality of the power developed by the inverter and leads to an undesired increase in the size of snubber circuits coupled across the power switches. In order to overcome these problems, a bi-directional switch according to the present invention includes circuitry for providing a high impedance path in series circuits including the main power switches and the clamping switch so that shoot-through currents are blocked even when one of the main power switches and the clamping switch are simultaneously on. The delays between turn-off of a main power switch and turn-on of the clamping switch can thereby be reduced or eliminated, thereby resulting in improved quality of the output power of the inverter and a reduction in the size of snubber circuits used therein.
REFERENCES:
patent: 3286155 (1966-11-01), Corey
patent: 3641417 (1972-02-01), Gyugyi
patent: 4339791 (1982-07-01), Mitchell
patent: 4443841 (1984-04-01), Mikami et al.
patent: 4463400 (1984-07-01), Paice et al.
patent: 4564895 (1986-01-01), Glennon
"New Format Step-wave Output Inverter", Akira Naniwae, Isao Takahashi, Yasunobu Akagi, Nagaoka Institute of Science and Technology.
Dhyanchand P. John
Shekhawat Sampat S.
Thollot Pierre
Salce Patrick R.
Sundstrand Corporation
Todd Voeltz Emanuel
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