Line voltage compensating pulsed power welding supply
Abstract
Abstract THE PULSED POWER WELDING PROCESS IS IMPROVED BY USING SHORTER ARC LENGTHS, WHICH BRING A NEED FOR HOLDING THE ARC VOLTAGE SUBSTANTIALLY CONSTANT. TO DO THIS, LINE VOLTAGE COMPENSATION IS REQUIRED. IT IS ACCOMPLISHED IN A PULSED POWER WELDING SUPPLY BY A FEEDBACK LOOP WHICH CONTROLS THE PORTION OF THE CYCLE DURING WHICH CURRENT IS PASSED THROUGH A TRIGGER RECTIFIER, WHICH TRIGGER RECTIFIER IS NOT COUPLED TO THE LOAD CIRCUIT. THE TRIGGER RECTIFIER CONTROLS THE PASSASGE OF POWER THROUGH A HEAVY DUTY, POWER-TYPE RECTIFIER WHICH IS ENERGIZED DURING PERIODS OF WELDING. THE FEEDBACK LOOP IS ALLOWED TO REACH A STEADY STATE BEFORE POWER IS FIRST APPLIED TO THE POWER RECTIFIER, WITH THE RESULT THAT TRANSIENTS IN THE POWER RECTIFIER LOAD ARE AVOIDED. IN THE LOOP, A COMPARISON IS MADE BETWEEN A MANUALLY CONTROLLABLE REFERENCE WAVE AND A SAMPLE WAVE DERIVED FROM THE OUTPUT OF THE TRIGGER RECTIFIER. LINE VOLTAGE VARIATIONS ARE COMPENSATED BY CHANGES IN THE LENGTH OF THE PORTION OF THE CYCLE DURING WHICH THE TRIGGER RECTIFIER IS CONDUCTING.
Inventors
- 👤 Emmett R Anderson
- 👤 Robert E Rutz
Bibliographic Details
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