초록 ▼

A method and concomitant apparatus for use in an electrochromic control system in which components causing the charging and discharging of an electrochromic device are subject to drift errors and other errors. In the case of such errors, the actual programming level and the desired programming level

A method and concomitant apparatus for use in an electrochromic control system in which components causing the charging and discharging of an electrochromic device are subject to drift errors and other errors. In the case of such errors, the actual programming level and the desired programming level as indicated by, e.g., a count value, may diverge. The invention periodically determines the actual programming level of the electrochromic device and responsively adjusts a parameter representative of the desired programming level.

대표청구항 ▼

[ What is claimed is:] [1.] In a system for controlling a charge state of an electrochromic device by selectively imparting, via control logic, one of a positive charge and a negative charge to said electrochromic device in response to changes in a value representative of a desired charge state, app

[ What is claimed is:] [1.] In a system for controlling a charge state of an electrochromic device by selectively imparting, via control logic, one of a positive charge and a negative charge to said electrochromic device in response to changes in a value representative of a desired charge state, apparatus for correcting said desired charge state representative value comprising:an analog to digital converter, coupled to measure said charge state of said electrochromic device without significantly altering said charge state, for producing a value representative of an actual charge state of said electrochromic device;a code converter, coupled to said analog to digital converter, for converting said actual charge state representative value into a corrected charge state representative value;a timer, coupled to said control logic, for providing a control signal indicative of said electrochromic device achieving a substantially quiescent charge state; anda value changer, responsive to said quiescent state indicative control signal and said corrected charge state representative value, for replacing said desired charge state representative value with said corrected charge state representative value.