Load power control method using a phase control system, and device therefor
US5986440A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1998 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | May 18, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for controlling the power of a load (1) powered from a source of AC voltage U having a period T using a phase control system, wherein, for a predetermined set power, a sequence of an integer p of elements, where p is greater than 1, is periodically delivered to the load (1), each element, numbered i, of the sequence being characterized by an integer n.sub.i with a half-period T/2 during which the AC voltage U is switched according to a series of different phase angles .alpha..sub.i from .alpha..sub.1 to .alpha..sub.n corresponding to respective durations t.sub.i from t.sub.l to t.sub.n during which the load (1) is cut: off from the power supply. The phase angles .alpha..sub.i of element i and .alpha..sub.i+1 of element i+1 have similar repetitive values so that the mean current is zero over a complete cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.