High stability dimmer
US8618743B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 2011 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Nov 16, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention is aimed at providing a dimmer capable of preventing malfunctions due to noise contamination or waveform distortion of the voltage of an AC power source. The dimmer according to the present invention has a time division control circuit for controlling an effective voltage supplied to a lighting load by regulating the period of time to turn on a switching element, and further includes: a zero-crossing detector section 11 for detecting a zero-crossing point and generating a zero-crossing signal whose value changes at the zero-crossing point; an oscillator 13 for generating an oscillating signal having a frequency equal to that of the AC power source or an integral multiple of this frequency; a reference point determiner section 14 for measuring a phase difference between the zero-crossing signal and the oscillating signal every time the zero-crossing signal is generated, and for determining a reference point for setting the timing of turning on or off the switching element 6 based on a data of the measured value of the phase difference; and a time division control signal generator (on/off timing calculator section 15 and time division control signal generator se…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.