Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1990-06-21
1991-10-01
Stephan, Steven L.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363138, H02M 545
Patent
active
050539388
ABSTRACT:
A converter of the electric energy fed by a unidirectional voltage source, comprising a voltage inverter circuit arranged to deliver an alternating voltage, possibly polyphase, to an inductive load such as an electric motor, wherein between the energy source and the voltage inverter circuit there is inserted a set of components arranged for controlling in an active manner the supply voltage of the inverter circuit, limiting the maximum value of the voltage applied thereto and assisting the commutation by transitorily bringing to zero (or to a negative value) the supply voltage applied to the inverter circuit during the periods of time in which any commutation should be carried out therein. This set of components includes a capacitor connected, through a diode, in parallel to the unidirectional voltage source, a first controlled switch inserted in parallel to the diode, and a second controlled switch inserted in parallel to the inverter circuit input.
REFERENCES:
patent: 3538419 (1970-11-01), Seki et al.
patent: 3872364 (1975-03-01), Hubner
patent: 3939387 (1976-02-01), Maeda
patent: 4086622 (1978-04-01), Vukasovic
patent: 4236201 (1980-11-01), Okado et al.
patent: 4309751 (1982-01-01), Okado
patent: 4403280 (1983-09-01), Okado
patent: 4506319 (1985-03-01), Akamatsu
patent: 4567420 (1986-01-01), Beck
patent: 4965709 (1990-10-01), Ngo
Stephan Steven L.
Sterrett Jeffrey L.
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