Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1993-02-09
1995-01-03
Stephan, Steven L.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 41, 363 98, 318599, 3889072, H02M 75387, H02P 500
Patent
active
053792092
ABSTRACT:
A pulse-width modulated (PWM) circuit provides current through a load by opening and closing main electronic switches which connect the load to a power supply. Each main electronic switch connects with an auxiliary switch, connected in series with a diode, the auxiliary switch and diode being called "recovery paths". The recovery paths provide a path between the load and the associated main switch, on one side, and the power supply on the other. A first train of pulses, derived from a command signal, drives the main switches, and a second train of pulses, derived from the first pulse train, controls the switches in the recovery paths. One arranges the second train such that the recovery paths carry current only while the main switches change from on to off, or from off to on. In this way, the recovery paths carry part of the current that would otherwise flow transiently through the main switches, due to the inherent inefficiencies in semiconductor switching. Therefore, the present invention allows the main switches to increase in efficiency as compared with circuits of the prior art.
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patent: 5025360 (1991-06-01), Latos
patent: 5070292 (1991-12-01), Goff
patent: 5081409 (1992-01-01), Goff
patent: 5111381 (1992-05-01), Pigott et al.
patent: 5262932 (1993-11-01), Stanley et al.
Berhane Adolf
Eilberg William H.
Performance Controls, Inc.
Stephan Steven L.
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