PCB Resonance Frequency Control for Wireless Power Interference
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Solution Overview
Problem
Electronic devices experience interference and malfunctions due to resonance with wireless power transmission apparatuses, leading to unstable power supply and performance degradation when their resonance frequencies match those of the wireless power transmission systems.
Innovation Solution
A printed circuit board (PCB) with a resonance frequency control unit that includes a variable capacitor and capacitors connected in series or parallel, allowing the PCB to adjust its resonance frequency to match or diverge from the wireless power transmission apparatus's frequency, thereby mitigating interference and ensuring stable power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the PCB operates near a wireless power transmission apparatus, then wireless power transmission can be utilized, but resonance interference occurs causing power supply instability
Solution Approach 1:
The patent applies the dynamics principle by making the resonance frequency of the PCB adjustable rather than fixed. The resonance frequency control unit dynamically changes the resonance frequency based on the operating environment to avoid interference from wireless power transmission apparatuses. This is achieved through variable capacitors that can alter the electrical characteristics of the power plane and ground plane, allowing the system to adapt its resonance properties in real-time to maintain stable operation.
Solution Approach 2:
The patent implements parameter changes by modifying the resonance frequency parameter of the PCB. When interference is detected or anticipated, the system changes the resonance frequency to a value that avoids overlap with the wireless power transmission frequency. This parameter adjustment is accomplished through controlling the capacitance values in the power distribution network, which directly affects the resonant frequency formula f = 1/(2π√(LC)).
2Productivity
If the resonance frequency of the PCB matches the wireless power transmission frequency, then power transmission efficiency may be improved, but mutual resonance interference causes device malfunction
Solution Approach 1:
The patent applies preliminary anti-action by proactively controlling the resonance frequency to prevent interference before it occurs. The system monitors the operating environment and adjusts the resonance frequency in advance to avoid matching frequencies that would cause harmful mutual resonance. This preventive approach allows the system to maintain optimal power transmission efficiency while avoiding the detrimental effects of resonance interference.
Solution Approach 2:
The system implements feedback mechanisms to detect power supply abnormalities that indicate resonance interference. When the detecting unit identifies anomalies in the power supply to the IC, it triggers the resonance frequency control unit to adjust the frequency. This closed-loop feedback ensures that the system can respond to interference conditions and maintain stable operation by adapting the resonance frequency based on actual operating conditions.
3Ease of manufacture
If fixed capacitance values are used in the PCB, then manufacturing is simpler, but resonance frequency cannot be adjusted to avoid interference
Solution Approach 1:
The patent transforms the static capacitance structure into a dynamic one by incorporating variable capacitors controlled by the resonance frequency control unit. While this increases manufacturing complexity compared to fixed capacitors, it enables the system to adapt its resonance frequency to different operating environments. The variable capacitance elements allow the power plane and ground plane configuration to be tuned, providing the necessary adaptability to avoid resonance interference while maintaining manageable manufacturing processes.
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
The solution effectively controls the resonance frequency of the PCB, preventing interference and ensuring a stable power supply to the integrated circuit, thereby improving the reliability and durability of electronic devices in wireless power transmission environments.
Implementation Method 1
Some wireless power transmission technologies use resonance characteristics of radio frequency (RF) devices. The resonance frequency control unit is configured to control a resonance frequency of the PCB based on the supply of power.
Implementation Method 2
The PCB includes a variable capacitor operatively connected between the power plane and the ground plane, and the resonance frequency control unit includes a capacitor capacity determining unit configured to determine a capacity of the variable capacitor based on the change in the supply of power.
Data Source
AI summary
Provided is an apparatus and method to control a resonance frequency of a device subject to wireless power transmission interference. The apparatus and method include supplying power from a printed circuit board (PCB) to an integrated circuit (IC) during exposure to a wireless power transmission environment experiencing mutual resonance. The apparatus and method also include a resonance frequency of the PCB based on a change in the supply of power.