Variable Frequency Control for Suspended Particle Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing Suspended Particle Device (SPD) window control systems face challenges in scalability, energy efficiency, and the 'singing' issue due to fixed frequency operation, and require extensive wiring for centralized control, making them unsuitable for large-scale building applications.
Innovation Solution
A Scalable Controller with mesh networking and microprocessor-driven software enables dynamic control of SPD windows through variable frequency operation, eliminates the 'singing' issue, and uses wireless communication to reduce wiring needs, allowing for centralized control of multiple windows with enhanced energy management and multimedia capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed frequency operation is used to control SPD windows, then the control system is simple, but the 'singing' issue occurs and energy efficiency is reduced
Solution Approach 1:
The patent applies dynamics by transitioning from fixed frequency operation to variable frequency operation. The controller dynamically adjusts the frequency of electrical signals applied to the SPD particles, allowing the system to adapt to different operational conditions and eliminate the singing issue that occurs at fixed frequencies.
Solution Approach 2:
The patent implements parameter changes by varying the frequency parameter of the electrical signal applied to the SPD. Instead of maintaining a constant frequency, the system changes the frequency parameter dynamically to control particle alignment while avoiding resonant frequencies that cause singing.
2Adaptability or versatility
If centralized control of multiple windows is implemented, then control capability is enhanced, but extensive wiring is required
Solution Approach 1:
The patent replaces the mechanical wiring system with wireless communication technology. Controllers for multiple SPD windows communicate control signals and status information wirelessly, eliminating the need for extensive physical wiring while maintaining centralized control capability across multiple windows.
3Object-generated harmful factors
If variable frequency operation is used to eliminate singing, then the singing issue is resolved, but control system complexity increases
Solution Approach 1:
The patent implements self-service by incorporating a microprocessor-driven controller that autonomously manages the variable frequency operation. The controller automatically adjusts frequencies to eliminate singing without requiring complex external control systems, making the system self-regulating and reducing overall system complexity.
Solution Approach 2:
The patent applies universality by designing a multi-functional controller that handles frequency variation, singing elimination, and window control capabilities in a single integrated device. This universal controller reduces the need for multiple separate components and simplifies the overall control system architecture.
4Device complexity
If wireless communication is used for control, then wiring needs are reduced, but energy consumption increases
Solution Approach 1:
The patent applies periodic action by implementing duty cycling in the wireless communication system. The controller transmits and receives signals in periodic intervals rather than continuously, allowing the system to maintain wireless control functionality while significantly reducing energy consumption compared to continuous operation.
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 solution provides scalable, energy-efficient, and wirelessly controlled SPD systems that can manage opacity and display capabilities across large buildings, reducing energy consumption and eliminating the 'singing' issue, while minimizing the need for extensive wiring.
Implementation Method 1
the particles become aligned and for many suspensions most of the light can pass through the cell
Implementation Method 2
when an electric field is applied through the liquid light valve suspension in the light valve, the particles become aligned
Implementation Method 3
In the absence of an applied electrical field, the particles in the liquid suspension assume random positions due to Brownian movement
Data Source
AI summary
A scalable apparatus and a network environment dynamically changes the light transparency of a single SPD device, a small number of SPD devices or thousands of such SPD devices installed in windows in automobiles, aircraft, trains, marine vehicles, residential homes, commercial buildings and skyscrapers. A scalable apparatus and a network environment dynamically changes the light transparency of a single SPD device or thousands of such SPD devices in the presentation of a multi-media special effects display. Textual messages, graphical images and simulated motion effects are driven. Such scalable apparatus being capable of driving and using several operational parameters of SPD's such as frequency range, AC voltage and temperature so as to provide fine control of SPD characteristics such as switching speed and power consumption.