Parallel Tuned LC Amplifiers for Loosely Coupled Wireless Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless charging systems using resonant inductive technology are limited by inefficient amplifier topologies that are sensitive to changes in load impedance and environmental reflections, leading to power losses and potential damage, especially in loosely coupled systems where the transmitter and receiver are far apart.
Innovation Solution
The implementation of a parallel tuned resonant LC network in Class D and E amplifier topologies, which maximizes voltage across the transmitter antenna, reduces harmonics, and provides better protection from position changes and reflections, using a transformer to further enhance power delivery and isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional amplifier topologies are used in wireless charging systems, then the system can operate with simpler circuit design, but power efficiency deteriorates and the amplifier becomes sensitive to load impedance changes and environmental reflections
Solution Approach 1:
The patent implements a parallel tuned resonant LC network that dynamically adapts to load impedance changes and environmental reflections. The resonant frequency of the LC network is tuned to match the operating frequency, allowing the system to maintain high power efficiency despite variations in coupling conditions or surrounding electromagnetic environment.
Solution Approach 2:
The patent transforms the amplifier topology by changing the circuit configuration from conventional series or parallel RLC networks to a specific parallel tuned resonant LC network. This parameter change in circuit topology fundamentally improves power efficiency by creating a high-impedance path at the resonant frequency, reducing power loss in the amplifier.
2Length of moving object
If the transmitter and receiver are placed far apart in loosely coupled systems, then the charging distance is increased, but power transfer efficiency deteriorates and amplifier components may be damaged
Solution Approach 1:
The parallel tuned resonant LC network provides dynamic adaptation to varying coupling conditions. When the transmitter and receiver are far apart, the resonant network automatically adjusts the impedance matching, maintaining efficient power transfer across the extended distance without requiring physical realignment or reducing charging distance.
Solution Approach 2:
The resonant LC network acts as an intermediary between the amplifier and the transmitter antenna. It provides impedance transformation and isolation, allowing the amplifier to drive the antenna efficiently even when the load impedance varies due to loose coupling or environmental reflections, thereby enabling extended charging distances.
3Reliability
If conventional amplifier topologies are used, then the circuit design is simpler, but the amplifier becomes sensitive to environmental reflections and position changes causing potential damage
Solution Approach 1:
The parallel tuned resonant LC network provides beforehand cushioning by creating a high-impedance barrier at the resonant frequency. This network configuration预先 protects the amplifier from harmful reflections and impedance mismatches that could occur due to environmental factors or position changes, preventing damage before it happens.
Solution Approach 2:
The resonant LC network serves as a protective intermediary between the amplifier and the variable electromagnetic environment. It isolates the amplifier from reflections caused by nearby objects or position changes, maintaining stable operation and preventing damage without requiring complex protection circuits.
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 improves power efficiency and stability in wireless charging systems, enabling efficient power transfer over longer distances and in loosely coupled scenarios without causing damage to the amplifier components.
Implementation Method 1
The LC tank is tuned so that the entire system operates completely in resonance rather than using an off-resonant load network
Implementation Method 2
By having a parallel resonant LC tank, the amplifier is better protected from movements or changes in the position of the receiver or capacitive and inductive reflections from the surrounding environment that could cause a dramatic change in the efficiency of the amplifier or may irreparably damage it.
Data Source
AI summary
The disclosed technology provides a system for transmitting wireless power for charging electronic devices, e.g., smartphones, medical appliances, industrial equipment, and robotics. Some embodiments include parallel tuned resonant LC networks, load networks, and impedance matching networks for Class D and E, single-ended or differential, amplifier topologies for wireless power transfer in resonant inductive systems.