Wireless Energy Transfer Control via Primary-Side Calculation
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Solution Overview
Problem
Existing energy transmission systems face inefficiencies due to resource consumption and control speed limitations, particularly in wireless energy transfer to implantable devices, where real-time feedback is not necessary and can lead to energy wastage and reduced accuracy.
Innovation Solution
A method for wireless energy transmission that calculates secondary current or voltage solely based on primary side measurements, eliminating the need for a return channel and using calculated mutual inductance and transfer functions to determine optimal energy transfer parameters, allowing for fast and reliable energy delivery without real-time secondary feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a return channel is used to transmit secondary current information for monitoring and regulation, then control accuracy is improved, but energy consumption increases and control speed decreases due to time delays
Solution Approach 1:
The invention extracts and eliminates the return channel from the energy transmission system. By calculating secondary current solely from primary side measurements (primary current and voltage) using mutual inductance and transfer functions, the system removes the need for secondary current measurement and transmission, thereby reducing energy consumption and eliminating time delays while maintaining control accuracy
Solution Approach 2:
The system uses self-service by having the primary device independently calculate secondary current parameters using its own measurements and pre-stored device parameters (capacitance C1, inductance L1, resistance R1, mutual inductance M). This eliminates dependency on secondary feedback, allowing the primary device to autonomously regulate energy transmission without external information input
2Reliability
If a return channel is used to transmit secondary current information, then monitoring capability is improved, but control speed decreases due to time delays
Solution Approach 1:
The invention removes the return channel that causes time delays. By calculating secondary current in real-time from primary side measurements without waiting for secondary feedback, the system achieves instantaneous control response while maintaining monitoring capability through the calculation-based approach
Solution Approach 2:
The system performs preliminary action by pre-storing device parameters (capacitance C2, inductance L2, resistance R2, mutual inductance M) in the primary device before operation. This allows immediate calculation of secondary current from primary measurements without needing to wait for secondary feedback, thereby increasing control speed while maintaining monitoring capability
3Measurement precision
If measured values from the secondary side are used for calculation, then calculation accuracy is improved, but device complexity increases due to additional measurement and transmission requirements
Solution Approach 1:
The invention extracts and removes the secondary measurement and transmission subsystems. By achieving sufficient calculation accuracy using only primary side measurements (primary current I1 and voltage U1) combined with pre-stored device parameters, the system eliminates the need for secondary current sensors, measurement circuits, and communication infrastructure, thereby reducing device complexity while maintaining calculation accuracy
Solution Approach 2:
The system uses copying by utilizing pre-stored device parameters (capacitance C2, inductance L2, resistance R2, mutual inductance M) that represent the secondary device characteristics. These stored parameters allow the primary device to accurately calculate secondary current without physically measuring it, effectively creating a virtual model of the secondary device that eliminates the need for complex physical measurement systems
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 approach reduces energy consumption, enhances control speed, and increases reliability by eliminating the need for frequent secondary feedback, ensuring robust energy delivery to implantable devices with minimal disruption, even in loss of connection scenarios.
Implementation Method 1
The secondary coil and the primary coil are designed for electromagnetic interaction to transfer energy
Data Source
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AI summary
A method for wireless energy transmission, wherein energy is wirelessly transmitted from a primary device (1) to an implantable secondary device (2), and wherein the primary device comprises a primary coil (11) and the secondary device (2) comprises a secondary coil (12) for electromagnetic interaction with the primary coil (11), comprising a control system comprising: measuring a primary current flowing through the primary coil (11) and a primary voltage applied to the primary coil, calculating a secondary current of the secondary coil (12) and a secondary voltage of the secondary coil (12) as a function of the measured primary current and the measured primary voltage, comparing the calculated secondary current with a target secondary current and/or the calculated secondary voltage with a target secondary voltage, and specifying a target primary current and a target primary voltage as a function of the comparison.and operating the primary coil with the primary set voltage and primary set current to transfer energy to the secondary coil (12).