Electricity: power supply or regulation systems – External or operator controlled – Zero switching
Patent
1990-04-10
1992-07-07
Sterrett, J. L.
Electricity: power supply or regulation systems
External or operator controlled
Zero switching
323207, 323235, 323910, G05B 2402
Patent
active
051286041
ABSTRACT:
A three-phase transformer is supplied by a three-phase AC line voltage. Two phases are connected via switches comprising head-to-tail connected thyristors. The third phase is connected directly to the transformer. The switches are of the zero voltage switching type. Under steady state conditions, the start of each series of cycles is obtained by closing in a fixed order a first switch at a time near the zero-crossing of the voltage across it (alternating between series of cycles the sign of the derivative of the voltage across it immediately before it is closed) and then the second switch approximately 90.degree. after the first switch. The duration of a series of cycles if 570.degree. plus a null or integer number of periods of the AC line voltage. This is achieved by counting thyristor firing command signals from pulse transformers driven by monostables.
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Roublot, "Un circuit integre pour la commande de thyristors et triacs", Electronique Industrielle, Apr. 1970, pp. 227-231.
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