Three phase regulated d.c. power supply with control for balancing input phase current
Abstract
Abstract A POWER SUPPLY SYSTEM HAS A REGULATED D.C. OUTPUT AND A THREE PHASE A.C. INPUT. INPUT CURRENT IN EACH PHASE IS CONTROLLED BY A SILICON CONTROLLED RECTIFIER (SCR). THREE BLOCKING OSCILLATORS PRODUCE OUTPUT PULSES FOR FIRING THE SCAR''S AT PHASE ANGLES DETERMINED IN RESPONSE TO THE D.C. OUTPUT VOLTAGE AND CURRENT. ADDITIONALLY THE FIRING ANGLES FOR TWO OF THE THREE SCR''S ARE AUTOMATICALLY ADJUSTED TO BALANCE CURRENT AMONG THE THREE PHASES AT THE INPUT. THIS IS ACHIEVED BY CIRCUITRY WHICH SENSES AND COMPARES THE POSITIVE AND NEGATIVE INPUT CURRENT IN TWO OF THE PHASES AND PRODUCES DIFFERENCE SIGNALS WHICH DRIVE TWO FO THE BLOCKING OSCILLATORS TO ADJUST THE FIRING ANGLES OF TWO OF THE SCR''S UNTIL PHASE CURRENT IS EQUALIZED.
Inventors
- 👤 Johan F Blokker
- 👤 Robert J Bland
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |