Light string having at least one protecting circuit
US9433056B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 2015 |
| Grant date | Aug 30, 2016 |
| Priority date | — |
| Expiry date | Oct 21, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides a light string including at least one light series branch and a protecting circuit connected between the at least one light series branch and an AC power supply. The protecting circuit includes a switching circuit, a sample circuit and a control circuit for switching off the switching circuit and keeping the switching circuit at off-state when the sampled voltage is larger than or equal to a preset voltage, and controlling the switching circuit to turn on and turn off the at least one light series branch. When the number of the failed lamps and removed lamps reaches to a preset number, the current is opened to protecting the reminder light from been burned out. The light string can light on and off alternately like twinkling stars, or the colors can be changed alternately.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.