Wireless Power Transmitter with Adjustable Ferrite Core
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Solution Overview
Problem
Current wireless charging systems face inefficiencies in power transfer due to impedance mismatches and variable power demands of devices, leading to suboptimal energy delivery and potential overheating or undercharging.
Innovation Solution
Incorporating adjustable impedance and resonant frequency control in both the power transmitting and receiving units using variable magnetic and electrical elements, such as ferrite cores and coils, to steer and optimize the magnetic field and impedance matching for improved power transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed impedance and resonant frequency are used in wireless charging systems, then device compatibility is improved, but power transfer efficiency deteriorates due to impedance mismatches and variable power demands
Solution Approach 1:
The patent implements dynamic adjustment of impedance and resonant frequency through variable magnetic elements (ferrite cores) and electrical components (capacitors, inductors) that can be tuned in real-time. This allows the wireless charging system to adapt to different devices and operating conditions, resolving the contradiction between fixed compatibility and variable efficiency by making the system parameters dynamic rather than static
Solution Approach 2:
The system changes physical parameters (impedance, resonant frequency, magnetic permeability) of the transmitting and receiving units to optimize power transfer. By adjusting these parameters based on device detection and feedback, the system maintains both broad compatibility and high efficiency across different charging scenarios
2Productivity
If higher power is transmitted to meet variable power demands, then charging speed is improved, but overheating risk increases due to impedance mismatches
Solution Approach 1:
The patent incorporates feedback mechanisms that monitor power transfer efficiency, temperature, and impedance matching in real-time. Based on this feedback, the system dynamically adjusts transmission power and tuning parameters to prevent overheating while maintaining optimal charging speed, resolving the contradiction between high productivity and thermal safety
Solution Approach 2:
The system dynamically adjusts power transmission levels and impedance parameters based on real-time conditions, allowing it to deliver high power when appropriate while preventing overheating through continuous adaptation, thus resolving the contradiction between charging speed and thermal safety
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
Enhances power transfer efficiency by dynamically adjusting the magnetic field and impedance to match the device's requirements, ensuring reliable and efficient charging while preventing overheating or undercharging.
Implementation Method 1
Incorporating adjustable impedance and resonant frequency control in both the power transmitting and receiving units using variable magnetic and electrical elements, such as ferrite cores and coils, to steer and optimize the magnetic field
Implementation Method 2
power transmitting unit with adjustable field... transmit coil configured to transmit the wireless power signal via a transmit magnetic field
Implementation Method 3
adjustable impedance and resonant frequency control... to optimize the magnetic field and impedance matching for improved power transfer efficiency
Data Source
AI summary
In various embodiments, a power transmitting device includes a wireless power generator configured to generate a wireless power signal. A transmit resonator is configured to transmit the wireless power signal via a transmit magnetic field to a power receiving unit. The transmit resonator includes a transmit coil configured to generate that transmit magnetic field in response to the wireless power signal. At least one variable magnetic element is configured to adjust at least one property of the transmit coil by varying a reluctance of the at least one variable magnetic element in response to at least one control signal. A processing device is configured to generate the at least one control signal to select the reluctance corresponding to the at least one property of the transmit coil.