Systems and methods for switching a relay at zero cross
US8559154B2 · kind B2 · utility
17Cited by
12References
18Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 1, 2011 |
| Grant date | Oct 15, 2013 |
| Priority date | — |
| Expiry date | Mar 23, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2009/566
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Circuitry, systems and methods that address the need to coordinate relay switching with another event, such as a zero crossing of an alternating current (AC) voltage waveform are described. In some embodiments, the systems and methods continuously or periodically calibrate the timing of control signals to a relay, such that the switching of the relay in response to some (e.g., second or subsequent) control signals occurs closer in time to a zero crossing of an AC line voltage than the switching of the relay in response to other (e.g., initial or first) control signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.