Zero power detector switch and power transfer system
Abstract
Abstract The present invention relates to zero power detector switches and power transfer systems adapted to switch power on and off in an A.C. system and to transfer power for a load from one power supply to another power supply. Circuits are disclosed for sensing when an alternating power supply voltage is crossing a zero reference axis with the circuit then operating to apply the power supply voltage to a load in a noise free manner. Details of circuits are provided for pre-gating silicon controlled rectifiers in the zero power turn-on circuits for further reducing sources of noise signals associated with turn-on of such devices. A power transfer system for transferring the load on one power to a different power supply without the generation of electrical disturbance to the load is also disclosed in detail.
Inventors
- 👤 Edward S Baker
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |