Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1987-11-05
1989-07-18
Salce, Patrick R.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363132, 363136, H02H 7122
Patent
active
048498734
ABSTRACT:
Active snubber structure and method for use with an electronic power inverter to reduce turn off losses in electronic switches in the power inverter. The snubber structure includes a resistor and a capacitor connected in series with each other and in parallel with the load on the power inverter and parallel, inverse connected silicon controlled rectifiers connected in parallel with the resistor for selectively shorting the resistor. In the method of use of the active snubber structure, electrical energy is stored in the capacitor connected in parallel with the load during on time of the inverter and the resistor is shorted immediately prior to the off time of the inverter whereby the capacitor charges substantially to the value of the source of direct current electrical energy during the on time of the inverter and on shorting of the resistor during off time of the inverter, the voltage across the load changes slowly so that the switches of the inverter can transition from on through a resistor like turn off stage, to completely off before there is appreciable voltage across them.
REFERENCES:
patent: 3286155 (1966-11-01), Corey
patent: 4063306 (1977-12-01), Perkins et al.
patent: 4403269 (1983-09-01), Carroll
patent: 4502085, Morrison et al.
patent: 4626980 (1986-12-01), McGuire
patent: 4639849 (1987-01-01), Noworolski et al.
Medar Inc.
Salce Patrick R.
Small Dale R.
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