Low power, high resolution position encoder for motorized window covering
US7673667B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 16, 2002 |
| Grant date | Mar 9, 2010 |
| Priority date | — |
| Expiry date | Oct 16, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B9/68
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A motorized window covering has a motor and a housing that holds the motor and a dc battery. When the motor is energized to move a window covering, a pulse detector counts the motor current pulses to determine the position of the window covering. A user can save a motor current pulse count corresponding to a desired position and then return the desired position from a different position by simply pressing a button on a remote control unit. Further, inaccuracies caused by motor current pulses that were not counted by the pulse detector, e.g., at start up, at shut down, or during coast down, are minimized by error correction logic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.