Overcharge-aware driver for electrochromic devices
US11467463B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2020 |
| Grant date | Oct 11, 2022 |
| Priority date | — |
| Expiry date | Mar 27, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2001/1502
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A overcharge-aware electrochromic device driver for preventing overcharge of an electrochromic device is described. One driver applies a constant supply current to an electrochromic device from a power supply. The driver determines an amount of charge as a function of time and current supplied to the electrochromic device. The driver determines whether the amount of charge reaches an overcharge limit before a sense voltage reaches a first sense voltage limit. Responsive to the amount of charge reaching the overcharge limit, the driver sets the sense voltage as a second sense voltage limit that is lower than the first sense voltage limit, ceases the constant supply current, and applies one of a variable voltage or a variable current to the electrochromic device from the power supply to maintain the sense voltage at the second sense voltage limit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.