Toroidal Transformer Magnetic Antenna for Low Voltage High Current
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Solution Overview
Problem
Conventional magnetic transmit antennas generate high voltages during resonance, posing safety hazards and requiring costly, heavy power amplifiers to achieve sufficient current for effective transmission, which is impractical for portable applications.
Innovation Solution
A toroidal core transformer with a primary winding inductively coupled to a secondary winding supplies low voltage and high current to a magnetic transmit antenna, eliminating the need for resonance and reducing power amplifier requirements, while maintaining efficient magnetic field generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a power amplifier is directly coupled to the magnetic transmit antenna with tuning capacitor to cause resonance, then the magnetic field strength is improved, but high voltages are generated creating safety hazards
Solution Approach 1:
The patent introduces a toroidal transformer as an intermediary device between the power amplifier and the magnetic transmit antenna. The transformer couples the amplifier to the antenna through magnetic induction, allowing current amplification without directly generating high voltages at the antenna. The primary winding receives voltage from the amplifier and induces current in the secondary winding, which then drives the antenna, thus mediating the energy transfer to avoid direct high voltage exposure.
Solution Approach 2:
The patent replaces the conventional direct electrical coupling system with a magnetic coupling system. Instead of using a capacitor-based resonant circuit that directly connects voltage to the antenna, the system uses electromagnetic induction through the toroidal transformer to transfer energy. This substitution of the energy transfer mechanism eliminates the need for high voltage resonance while achieving current amplification for strong magnetic field generation.
2Strength
If additional tuning circuitry is used to increase current, then the magnetic field strength is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the toroidal transformer component. The transformer simultaneously performs impedance matching between the power amplifier and the antenna, current amplification, and magnetic coupling. This consolidation of functions into a single device achieves the desired current increase for strong magnetic field generation without adding separate tuning capacitors, inductors, or complex resonant circuitry, thus reducing overall device complexity.
3Quantity of substance
If a high power amplifier is used to provide substantial drive current, then the current output is improved, but the weight and cost increase
Solution Approach 1:
The patent segments the current amplification function from the voltage amplification function. The power amplifier only needs to provide voltage output at its standard power rating, while the toroidal transformer handles the current multiplication through its turns ratio. This segmentation allows the use of a smaller, lighter power amplifier that would be insufficient if directly connected to the antenna, achieving high current output without requiring an oversized amplifier.
Solution Approach 2:
The patent changes the electrical parameters between the amplifier and antenna stages by introducing the transformer with a specific turns ratio. The transformer converts the voltage output from the amplifier into high current output for the antenna by exploiting electromagnetic induction principles. This parameter transformation allows the system to achieve high current drive capability using a moderate-power amplifier, avoiding the need for extremely high-power amplifiers that would be heavy and expensive.
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 enhances magnetic field strength without inducing resonance, reducing electromagnetic interference and power consumption, making it safer and more practical for portable communication systems by focusing on increased current over voltage.
Implementation Method 1
a toroidal core transformer with a primary winding inductively coupled to a secondary winding supplies low voltage and high current to a magnetic transmit antenna
Implementation Method 2
The magnetic transmit antenna includes a wire loop having multiple turns for generating a magnetic field
Data Source
AI summary
The present invention relates to a magnetic transmit antenna apparatus comprising: a toroidal core transformer having a primary winding inductively coupled to a secondary winding supplying a low voltage and high current to a magnetic transmit antenna wherein the magnetic transmit antenna includes a wire loop having multiple turns for generating a magnetic field. The toroidal core transformer includes a primary winding that operates in association with the secondary winding to match the impedance of a signal source to the magnetic transmit antenna.