Electronic controller for a water purifying unit
US4851818A · kind A · utility
34Cited by
2References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1988 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | Apr 1, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2209/05
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An analog ASIC (Application Specific Integrated Circuit) circuit has a power control section, a conductivity filter testing section, a light emitting diode (LED) driving section, and a bias section. The LED driving section is responsive to the conductivity filter testing section for indicating when the filter should be replaced. The power control section, conductivity filter testing section, LED driving section, and bias section are all operated in a controlled timed relation by a digital ASIC logic system to minimize power use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.