Power supply unit for a plasma plant
Patent 4224662 Issued on September 23, 1980. Estimated Expiration Date: 
April 10, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 10, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3465234 3467848 3683262 3792340 3832620 InventorAssigneeApplicationNo. 05/894619 filed on 04/10/1978US Classes:363/87, For plural phase to D.C. rectifier363/45Including means for reducing ripples from the outputExaminersPrimary: Shoop, William M.Attorney, Agent or FirmInternational ClassesG05F 1/10 (20060101)G05F 1/02 (20060101) G05F 1/12 (20060101) AbstractA power supply unit for a plasma plant, in particular for a plasma spraying plant, comprises an isolating transformer for connection to three-phase mains, a current control array and a rectifier array. The rectifier array comprises silicon wafer thyristors in a three-phase bridge configuration, which thyristors are electronically controlled through a current control loop, and an exterior voltage control loop is provided for additional electronic control of the silicon wafer thyristors.In the output from the thyristor array, a filter with a transient voltage suppressor may be provided as high-frequency protection and with di/dt limitation.Other References
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