Method for controlling a power converter using an auxiliary reso

Details Method for controlling a power converter using an auxiliary reso Method for controlling a power converter using an auxiliary reso

1990-09-17

1991-09-10

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 96, 363138, H02M 7521

Patent

active

050479130

ABSTRACT:
A method for controlling a power converter and an associated auxiliary commutation circuit ensures soft-switching of all switching devices employed therein. Such a power converter includes an inverter with at least two main switching devices per phase. Across each main switching device are connected an antiparallel diode and a relatively large snubber capacitor. The auxiliary resonant commutation circuit comprises two antiparallel-coupled auxiliary switching devices coupled in series with a resonant circuit including an inductor and the snubber capacitors. The gating and conduction times of the main and auxiliary switching devices are controlled so as to add boosting energy to the resonant operation, thus ensuring that the inverter output voltage at least reaches the positive and negative inverter rail voltages during each resonant commutation cycle. As a result, the control achieves commutation of the converter pole with substantially no switching losses.

REFERENCES:
patent: 4173779 (1979-11-01), Abbondanti et al.
patent: 4255783 (1981-03-01), Messer
patent: 4286317 (1981-08-01), Kommissari
patent: 4334265 (1982-06-01), Thorborg
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patent: 4730242 (1988-03-01), Divan
patent: 4881159 (1989-11-01), Holz et al.
G. Bingen; "Utilisation De Transistors a Fort Courant Et Tension Elevee", 1st European Power Electronics Conference, Oct. 16-18, 1985, (Conference Record vol. 1).
W. J. McMurray, "Resonant Snubbers with Auxiliary Switches", Aug. 1989, IEEE-IAS Conference Proceedings, pp. 829-834.

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