PWM Converter with control circuit responsive to minimum holding

Details PWM Converter with control circuit responsive to minimum holding PWM Converter with control circuit responsive to minimum holding

1982-03-10

1984-12-04

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 96, 363137, H02M 7515

Patent

active

044868243

ABSTRACT:
In a converter comprising gate turn-off thyristors, a current at an A.C. part of the converter is detected and a polarity of the detected current and a magnitude of the detected current is checked to determine if it is below a holding current level for maintaining the gate turn-off thyristors on. If the detected current is below the holding current level, a pulse width modulated signal is produced as a gate signal. If the detected level is above the holding current level, a short duration pulse synchronized with a rise and a fall of the pulse width modulated signal is produced as the gate signal. The gate signal is supplied to only those of the gate turn-off thyristors which correspond to the polarity of the detected current.

REFERENCES:
patent: 3710229 (1973-01-01), Jessee
J. Fac. Eng. Ibaraki Univ., (Japan), No. 28, pp. 1-7, 9-8-80, 51809-0033.
Conference Record of the Industry Applications Society, IEEE-IAS, 1981, MTG, Phila., Pa., USA, pp. 1208-1215, 52030-0074, (5-9 Oct. '81).
Proceedings of the First Annual Int. Motorcon '81 Conference, Chicago, Ill., USA, (10-13 Jun. '81), pp. 483-491, 52133-0081.
IEEE Transactions on Industry Applications, vol. 1A-15, No. 6, pp. 670-675, Nov./Dec., 1979.

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