Method and apparatus for achieving current balance in parallel c

Details Method and apparatus for achieving current balance in parallel c Method and apparatus for achieving current balance in parallel c

1993-06-04

1994-08-16

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Connecting or disconnecting

307 34, 307 52, 307633, 363 70, H02J 114, H02J 306, H03K 1772

Patent

active

053389948

ABSTRACT:
A scheme for maintaining current balance within a plurality of semiconductor devices, particularly thyristors and gate turn-off thyristors, which plurality is connected between two electrical power sources which devices are configured to be simultaneously conductive to share the current between the two sources, employs the scheme for maintaining the current within the several devices of the plurality equal. The scheme provides for the generation of individual current signals which represent the individual current magnitudes within the several devices. Further generated is an average current signal representing the average current within the plurality. A difference signal is generated with respect to each of the individual current signals which represents the difference between the average and the individual current signal. The difference signal is then employed to vary the time of application of the next control signal to the associated one of the devices to thereby minimize current imbalance within the plurality.

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