Electrochromic Controller for Intermediate State Transitions
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Solution Overview
Problem
Electrochromic devices face limitations in versatility and functionality due to lack of advanced control systems that can effectively manage transitions between optical states without temperature monitoring and account for unique features of these devices.
Innovation Solution
A controller system that controls current and voltage in switchable optical devices, such as electrochromic devices, by maintaining current within safe levels during initial transitions and adjusting voltage to prevent damage, allowing for transitions to intermediate states without temperature-dependent settings, using oscillating voltages to ensure uniformity across the device surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If voltage is applied to switchable optical devices, then optical state transitions occur, but device damage may occur due to excessive current
Solution Approach 1:
The control system dynamically adjusts voltage and current parameters during the transition process. It applies a voltage ramp during initial transition to limit inrush current, then switches to constant voltage mode when transition is complete, optimizing both speed and safety throughout the process
Solution Approach 2:
The system continuously monitors device current and voltage, and adjusts control parameters based on real-time feedback. This prevents excessive current that could damage the device while maintaining fast transition speeds through intelligent parameter modulation
2Measurement precision
If temperature monitoring is implemented, then precise control is achieved, but system complexity increases
Solution Approach 1:
The control system uses the device's own electrical characteristics (current, voltage, power consumption) as proxies for temperature state. By monitoring power dissipation and transition behavior, the system infers temperature conditions without external sensors, maintaining precision while avoiding additional complexity
Solution Approach 2:
The system changes control parameters (voltage ramp rate, current limits, pulse duration) based on inferred temperature conditions from electrical measurements. This allows adaptive control precision without adding temperature sensing hardware
3Stability of the object's composition
If uniform voltage is applied across large format windows, then uniform optical transition is achieved, but excessive current flows due to high sheet resistance
Solution Approach 1:
The control system segments the voltage application process into distinct phases: initial voltage ramp, constant voltage hold, and voltage reduction. Each phase is optimized for its specific purpose, allowing uniform transition while minimizing total energy consumption through precise temporal control
Solution Approach 2:
The system uses periodic voltage pulsing during the transition process, applying voltage in controlled intervals rather than continuously. This reduces average power consumption while maintaining uniform optical transition across the large format window
4Loss of time
If fast switching is implemented, then transition time is reduced, but current exceeds safe levels
Solution Approach 1:
The control system applies a preliminary voltage ramp before reaching the final voltage level. This gradual ramp-up prevents excessive inrush current while still achieving fast overall transition by preparing the device for the upcoming voltage change
Solution Approach 2:
The system applies just enough current to achieve the desired transition speed without exceeding safe levels. By carefully controlling current magnitude and duration, it achieves partial action sufficient for fast switching without the harmful effects of excessive current
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
Enables fast and uniform optical state transitions in electrochromic devices, reducing the risk of damage and achieving desired intermediate states efficiently, even in large format windows with high sheet resistance, while minimizing energy consumption.
Implementation Method 1
Electrochromism is a phenomenon in which a material exhibits a reversible electrochemically-mediated change in an optical property when placed in a different electronic state
Implementation Method 2
Tungsten oxide is a cathodic electrochromic material in which a coloration transition, transparent to blue, occurs by electrochemical reduction
Data Source
AI summary
A controller or control method may be designed or configured to operate without information about the current temperature of the device and/or the device's environment. Further, in some cases, the controller or control method is designed or configured to control transition of an optical device to an intermediated state between two end states. For example, the controller may be configured to control a transition to a state of transmissivity that is intermediate between two end states of transmissivity. In such case, the device has three or more stable states of transmissivity.