Wireless Piezoelectric Actuator Control via Resonant Induction
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Solution Overview
Problem
Existing contactless energy transfer systems for medical and diagnostic devices implanted within the body face challenges in achieving high voltage levels and precise alignment between primary and secondary devices, leading to inefficiencies and complexity in powering and controlling piezoelectric actuators.
Innovation Solution
A system comprising a primary device with a set of coils and an electronic supply driver, and a secondary device with a piezoelectric actuator and resonant circuit, where the actuator is wirelessly powered and controlled using phase-shifted signals, allowing for contactless energy transfer and control without the need for alignment or embedded control logic, utilizing a rotating magnetic field to power and control the actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If transcutaneous induction coil is used to power piezoelectric actuator, then wireless power transfer is achieved, but high current and precise alignment are required which increases complexity
Solution Approach 1:
The patent introduces a resonant circuit as an intermediary component in the secondary device that couples with the induction coil. This resonant circuit acts as a mediator that amplifies the induced voltage through resonance, eliminating the need for high current supply and precise alignment while achieving wireless power transfer to the piezoelectric actuator
Solution Approach 2:
The patent utilizes electromagnetic resonance (analogous to mechanical vibration principles) by designing the secondary circuit with specific inductance and capacitance values that resonate at the operating frequency. This resonance amplifies the voltage induced by the primary coil, solving the problem of insufficient voltage without requiring high current or precise alignment
2Power
If high voltage is generated through induction coil, then piezoelectric actuator can be driven, but primary device must approach very close to secondary device which reduces ease of operation
Solution Approach 1:
The patent employs resonant oscillation in the secondary circuit to amplify the voltage level. By tuning the resonant frequency of the secondary LC circuit to match the operating frequency, the system achieves high voltage output from the piezoelectric actuator even when the primary and secondary devices are not in close proximity, thereby improving ease of operation
Solution Approach 2:
The patent changes the electrical parameters (inductance and capacitance) of the secondary circuit to achieve resonance at the operating frequency. This parameter adjustment allows the system to generate sufficient voltage for driving the piezoelectric actuator without requiring close positioning between primary and secondary devices
3Power
If resonant circuit is added to secondary device, then voltage level is increased, but device complexity increases
Solution Approach 1:
The patent adjusts the inductance and capacitance parameters of the secondary circuit to achieve resonance. By carefully selecting these passive components, the system achieves voltage amplification through resonance without requiring active components or complex control circuits, thus minimizing the increase in device complexity while obtaining the desired voltage level
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 enables efficient wireless transfer of energy and control commands to implanted devices, reducing the size, cost, and risk of failure, while allowing for independent positioning of the primary device relative to the secondary device, and enabling the control of multiple actuators with reduced complexity and power consumption.
Implementation Method 1
a primary device having on one side a primary set of coils, the primary set comprising at least one primary coil... and on the other side a secondary device comprising a secondary set with at least one secondary coil
Implementation Method 2
The resonant circuit in the primary device increase the voltage level when the induced signal has the resonant frequency, so that a higher voltage may be obtained
Implementation Method 3
at least one piezoelectric actuator... said piezoelectric actuator being powered and controlled through said secondary set of secondary coils
Data Source
AI summary
A system for contactless transmission of energy and control signals between a primary device and a secondary device. The primary device has a primary set with at least one primary coil and an electronic supply driver for supplying primary signals to the primary set of primary coils. A secondary device has a secondary set with at least one secondary coil, at least one piezoelectric actuator, and electronic components including a resonant circuit powered by the secondary set. The piezoelectric actuator is powered and controlled through the secondary set of secondary coils and the electronic components.