Apparatus for controlling the power of an AC voltage supplying an electrical consumer by phase control and method for reducing harmonics
US7397225B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 9, 2005 |
| Grant date | Jul 8, 2008 |
| Priority date | — |
| Expiry date | Feb 9, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0029
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus for controlling the power of an AC voltage supplying an electrical consumer (14) by phase control and for reducing harmonics caused by said phase control, particularly within a range of 4 kHz, preferably within a range of the third harmonic, comprising a first switching element (12) (TRIAC) connected in series with the consumer (14) and driven by a control device (20) for performing a phase control. A second switching element (34) connected in series with a resistor element (32) is provided in parallel to the first switching element (12). The control device (20) is adapted to drive the second switching element (34) shortly before the first switching element (12) into its conducting state for a short time period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.