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US 4,053,945 AGranted
Master-slave control method and device for a multiphase circuit
OwnerGuy H. Dumasinventor
Life of this patent
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Abstract
A method and a device for the master-slave control of the power of a multiphase thyristor bridge. A master-pulse, from a master-pulse generating circuit coupled with one phase of the multiphase means, is applied to a slave-pulse generating circuit. Three slave-pulses out of phase of 120.degree. with respect to one another are produced by a slave-pulse generating circuit in case of a three-phase means. Said slave-pulses are applied across the gates and the anodes of a multiphase thyristor bridge.
Claims1
A master-slave device for controlling the power of a multiphase thyristor bridge comprising:
- a single means for forming a master-pulse having a determined and adjustable phase relationship with one phase of the multiphase feed voltage;
- delay means in parallel or serial-parallel in order to provide a number of slave-pulses equal to the number of phases of the multiphase feed voltage;
- coupling means comprising photocouplers for applying said slave-pulses to the respective gates of the thyristors of the bridge whereby the control circuit is insulated from the charge circuit.
Dependencies are inferred from the claim text.