UV bulb intensity control for water treatment system
US5324423A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 11, 1993 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | Feb 11, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control circuit for reducing current flow through the UV light bulb of a water purification unit when water is not flowing through the unit. In a first embodiment, the control circuit includes an RC shunt selectively connected in parallel with the UV bulb, thereby selectively adding a positive impedance in parallel with the negative impedance of the bulb. In a second embodiment, the control circuit includes an impedance selectively connected in series with the bulb ballast. In either embodiment, the impedance circuit is actuated in response to a water flow switch. When water is flowing through the unit, the impedance is removed so that full current is delivered to the bulb enhancing UV intensity. When water is not flowing through the unit, the impedance is added so that current flow is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.