Electroactive Material Actuator Units with Shared Power Lines
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Solution Overview
Problem
Existing electroactive polymer (EAP) actuator systems face challenges in efficiently addressing multiple actuators with reduced electrical connections, particularly in small form factor devices like catheters, where conventional wiring schemes are impractical due to space constraints and susceptibility to defects, and passive matrix addressing suffers from cross-talk issues.
Innovation Solution
A device comprising electroactive material actuator units connected in parallel across three power lines - a common reference power line, a controller power line, and a driver power line - where data signals are modulated onto these lines to address and control multiple actuators, reducing the need for additional dedicated data lines and enabling bidirectional communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional wiring schemes are used to connect multiple actuators, then each actuator can be individually controlled, but the number of electrical connections increases significantly and space requirements increase
Solution Approach 1:
The patent combines power delivery and data communication into a single shared electrical connection. The controller transmits both power and modulated data signals through the same wire to the actuators, eliminating the need for separate data lines and reducing the total number of connections required.
Solution Approach 2:
The electrical connection serves multiple functions simultaneously: it provides power delivery to the actuators and carries bidirectional data communication signals. This multi-functionality allows the system to control multiple actuators individually while using fewer wires than conventional separate power and data wiring schemes.
2Device complexity
If passive matrix addressing is used to reduce connections, then the number of electrical connections is reduced, but cross-talk between adjacent actuators occurs
Solution Approach 1:
The system uses bidirectional communication with feedback mechanisms to identify and address individual actuators accurately. The actuators can respond to address signals and report their status, allowing the controller to precisely target specific actuators without affecting adjacent ones, thereby eliminating cross-talk issues.
Solution Approach 2:
The patent employs frequency division multiplexing where different actuators are addressed using different frequency ranges. By modulating data signals at distinct frequencies for different actuators, the system can selectively activate specific actuators while preventing interference or cross-talk between adjacent actuators in the array.
3Ease of operation
If multiple dedicated data lines are used for each actuator, then individual actuator control is achieved, but the device form factor increases and susceptibility to defects increases
Solution Approach 1:
The patent merges power delivery and data communication functions into a single shared electrical connection. This consolidation reduces the number of wires needed, minimizing the device form factor and reducing the weight of the catheter while maintaining individual actuator control capability.
Solution Approach 2:
The electrical connection is designed to serve multiple functions: delivering power to the actuators and carrying bidirectional data signals for individual actuator addressing. This multi-functional approach eliminates the need for separate dedicated data lines for each actuator, reducing overall device complexity and form factor.
4Ease of operation
If more electrical connections are added to address multiple actuators, then individual actuator control is improved, but the susceptibility to defects and breaks increases
Solution Approach 1:
The patent combines power and data communication into a single shared connection, reducing the total number of electrical connections in the system. Fewer connections mean fewer potential points of failure, thereby improving the reliability of the device while maintaining individual actuator control.
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
This solution allows for efficient addressing and control of multiple actuators with a reduced number of electrical connections, minimizing cross-talk and enabling small form factor designs in applications like catheters, while simplifying circuitry and power supply requirements.
Implementation Method 1
Field-driven EAPs are actuated by an electric field through direct electromechanical coupling
Implementation Method 2
A voltage is used to cause the electroactive polymer layer to expand in all directions as shown
Data Source
AI summary
The proposed device comprises a plurality of electroactive material actuator units arranged as a set. Control data for driving individual units is transferred over three shared power lines. The electroactive material actuator of each unit is driven depending on control data received from the power lines via a demodulator, a controller, and a driver.