Antenna Resonance Frequency Control Using Active Rectifier
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Solution Overview
Problem
Current wireless charging systems face inefficiencies due to mismatched resonance frequencies between transmitter and receiver antennas, which reduces power transfer efficiency and is costly to address with existing solutions that require expensive high-voltage components or reduced antenna size.
Innovation Solution
A multi-frequency antenna system utilizing an H-bridge circuit with three half-bridge circuits and a controller to switch capacitance configurations, allowing the same physical antenna to operate at different resonant frequencies without taps or special switches, using a distributed rectifier system with transistors to manage high voltages within safe operating ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the antenna size is reduced to achieve resonance at higher frequencies, then the resonant frequency is improved, but the antenna efficiency and power transfer capability deteriorate
Solution Approach 1:
The patent changes the electrical parameters of the antenna by dynamically switching capacitance values using an H-bridge circuit with controllable switches. This allows the same physical antenna structure to resonate at different frequencies without changing its physical dimensions, thereby maintaining antenna efficiency while achieving frequency tuning.
Solution Approach 2:
The patent introduces dynamic control of the antenna resonance frequency through an H-bridge circuit with controllable switches that can change the capacitance configuration in real-time. This dynamic adjustment capability allows the system to adapt to different frequency requirements without physical modification of the antenna structure.
2Power
If high-voltage components are used to maintain power transfer at different frequencies, then the power transfer capability is improved, but the system cost and complexity increase
Solution Approach 1:
The patent makes the same antenna structure serve multiple frequency functions through the H-bridge circuit configuration. The antenna system can operate at different resonant frequencies without requiring separate high-voltage components for each frequency, reducing overall system complexity and cost while maintaining power transfer capability.
Solution Approach 2:
The H-bridge circuit acts as an intermediary that enables frequency switching without requiring expensive high-voltage components for each frequency. The circuit mediates between the fixed antenna structure and the variable frequency requirements, using controlled switching to achieve frequency adaptation.
3Adaptability or versatility
If multiple antennas are used to cover different frequencies, then the frequency coverage is improved, but the system complexity and alignment requirements increase
Solution Approach 1:
The patent makes a single antenna structure capable of operating at multiple frequencies through the H-bridge circuit with switchable capacitance configurations. This eliminates the need for multiple separate antennas and their associated alignment requirements, while maintaining broad frequency coverage capability.
Solution Approach 2:
The patent combines multiple frequency operation capabilities into a single antenna structure using the H-bridge circuit. Instead of having separate antennas for different frequencies, the system merges frequency diversity into one antenna through electrical reconfiguration, simplifying the overall system architecture.
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
Enables efficient power transfer across different frequencies without the need for expensive high-voltage components or reduced antenna size, maintaining efficiency and reducing costs by using the same antenna for multiple frequencies.
Implementation Method 1
a resonant antenna with a first resonant frequency and a second resonant frequency
Implementation Method 2
the controller is configured to control the third half-bridge circuit to switch the connection of the first capacitance to the resonant antenna to a first position that changes the resonant frequency of the resonant antenna to the first resonant frequency
Implementation Method 3
Magnetic inductive resonance systems allow for different antenna sizes and a larger distance between the charger and the charged device
Data Source
AI summary
An antenna control circuit including: an H-bridge circuit including three half-bridge circuits; and a controller configured to control the H-bridge circuit; wherein a first half-bridge circuit and a second half-bridge circuit of the three half-bridge circuits are configured to electrically connect across a resonant antenna with a first resonant frequency and a second resonant frequency; wherein a third half-bridge circuit is configured to electrically connect to a first capacitance connected to the resonant antenna, wherein the controller is configured to control the third half-bridge circuit to switch the connection of the first capacitance to the resonant antenna to a first position that changes the resonant frequency of the resonant antenna to the first resonant frequency.