Method and apparatus for supplying electric current to a number of electrical loads
US4313061A · kind A · utility
Inventor
Key dates
| Filing date | Mar 13, 1979 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Mar 13, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY04S20/222
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and circuit as disclosed herein for varying the current to N electrical loads by the use of SCR's, the arrangement being such that the total current is sinusoidal and of uniform amplitude at a particular setting. The technique involves the steps of generating a load sequence waveform, the period of which is nN full cycles of the ac source where n is any positive integer, and, during each period of the waveform, generating a load firing pattern for initiating the flow of a current I in each load, the load pattern being such that (a) the currents in each of the loads are initiated at instants which are n full cycles of the ac source apart, and (b) maintaining the current in each load for d full cycles of the ac source, where d is a duty factor and is any positive integer equal to or greater than n, but less than or equal to nN, whereby the total current drawn from the ac source is uniform and equal to dI/n.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.