Electrochromic Device Charging Control for Uniform Color Change
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Solution Overview
Problem
Existing electrochromic devices face issues with uneven color change, slow color change speed, and short cycle life due to non-uniform potential distribution and continuous constant voltage application, leading to instability and degradation.
Innovation Solution
A control method for electrochromic devices that includes determining current transmittance and open circuit potential, switching between first and second mode charging and discharging to maintain preset transmittance and potential thresholds, using various charging and discharging modes such as constant voltage/current, pulse, and sweeping speed to ensure uniform color change and prolonged service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If continuous constant voltage is applied to drive uniform color change, then color uniformity is improved, but device stability deteriorates due to edge region degradation
Solution Approach 1:
The patent applies periodic voltage adjustments instead of continuous constant voltage. The method involves initially applying a first voltage to achieve color change, then after a predetermined time, applying a second voltage that is higher than the first voltage to maintain uniform color. This periodic voltage adjustment prevents edge region degradation while maintaining color uniformity throughout the device operation.
2Ease of operation
If constant current charging is used to control transmittance, then transmittance control is simplified, but color change speed deteriorates
Solution Approach 1:
The patent changes the voltage parameter dynamically during operation. Initially, a first voltage is applied for color change, then a second voltage (higher than the first) is applied to maintain uniform color. This parameter change enables both simplified transmittance control through constant current charging and maintains fast color change speed by adjusting voltage at critical moments.
3Manufacturing precision
If larger voltage is applied to achieve uniform color change, then color uniformity is improved, but edge region stability deteriorates
Solution Approach 1:
The patent uses periodic voltage application where a first voltage is applied initially and then a second voltage (higher than the first) is applied after a predetermined time period. This timing-based periodic action ensures uniform color distribution while preventing excessive voltage exposure at edge regions that would cause instability and degradation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves rapid and uniform color change while extending the service life of electrochromic devices by optimizing charging and discharging processes to maintain consistent transmittance and potential levels.
Implementation Method 1
An electrochromic device needs to control the reversible electrochemical redox reaction of materials in the electrochromic device through an external applied voltage or an external applied current, so that the transmittance or the reflectivity of the device can be adjusted
Implementation Method 2
control the reversible electrochemical redox reaction of materials in the electrochromic device
Data Source
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AI summary
Provided are a control method, apparatus (300) and equipment (400) for an electrochromic device and a storage medium. The control method for the electrochromic device includes: determining whether a current transmittance of the electrochromic device reaches a preset transmittance; when determining that the current transmittance does not reach the preset transmittance, controlling an external power supply to perform a first mode charging and discharging on the electrochromic device until the current transmittance reaches the preset transmittance; when determining that the current transmittance reaches the preset transmittance, suspending the charging and discharging, and continuously monitoring whether a current open circuit potential of the electrochromic device is within a preset open circuit potential threshold range; and if the current open circuit potential is not within the preset open circuit potential threshold range, controlling the external power supply to perform a second mode charging and discharging on the electrochromic device to enable the current open circuit potential to be continuously within the preset open circuit potential threshold range.