Wireless Power Frequency Adjustment for Interference Avoidance
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Solution Overview
Problem
Wireless charging systems face interference issues when operating at frequencies that overlap with sensitive electrical components in devices, such as image sensors, touch sensors, or displays, leading to disrupted performance.
Innovation Solution
The wireless power receiving device measures the transmission frequency and sends adjustment requests to the transmitting device to modify the power level and frequency, ensuring the transmission frequency avoids sensitive bands, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless power is transmitted at a fixed frequency, then power transmission efficiency is maintained, but interference with sensitive electrical components occurs when the frequency lies in a sensitive frequency band
Solution Approach 1:
The patent implements dynamic frequency adjustment by allowing the wireless power transmitting device to change its transmission frequency based on feedback from the receiving device. The receiving device measures the transmission frequency and sends adjustment requests when interference is detected, transforming the static frequency system into a dynamic one that adapts to avoid sensitive frequency bands while maintaining power transmission reliability
Solution Approach 2:
The patent changes the frequency parameter of the wireless power transmission based on measured conditions. When the receiving device detects that the transmission frequency lies in a sensitive frequency band associated with components like image sensors, touch sensors, or displays, it requests the transmitting device to adjust the frequency parameter to avoid interference, thus resolving the contradiction between maintaining fixed frequency efficiency and avoiding interference
2Object-affected harmful factors
If the wireless power transmission frequency is adjusted to avoid sensitive bands, then interference with sensitive components is reduced, but system complexity increases due to frequency measurement and adjustment mechanisms
Solution Approach 1:
The patent implements a feedback mechanism where the receiving device measures the transmission frequency using measurement circuitry and sends in-band wireless power level adjustment requests back to the transmitting device when interference is detected. This feedback loop enables the system to automatically detect and correct frequency interference issues without requiring complex external control systems, reducing overall system complexity while effectively minimizing interference with sensitive components
Solution Approach 2:
The receiving device performs self-diagnosis by measuring the transmission frequency and determining whether it lies in a sensitive frequency band. Instead of requiring external monitoring systems, the receiving device autonomously identifies interference conditions and communicates adjustment requests to the transmitting device, enabling the system to self-correct frequency issues and reducing the need for additional complex control infrastructure
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 effectively reduces interference with sensitive components, maintaining the operational integrity of devices during wireless charging by dynamically adjusting the wireless power transmission frequency and level.
Implementation Method 1
a wireless charging mat wirelessly transmits power to a portable electronic device that is placed on the mat. The portable electronic device has a receiving coil and rectifier circuitry for receiving wireless alternating-current (AC) power from a coil in the wireless charging mat
Implementation Method 2
The portable electronic device has a receiving coil and rectifier circuitry for receiving wireless alternating-current (AC) power from a coil in the wireless charging mat
Data Source
AI summary
A wireless power system may use a wireless power transmitting device to transmit wireless power to a wireless power receiving device. The wireless power transmitting device may transmit wireless power at a wireless power transmission frequency. Wireless power signals at the wireless power transmission frequency can create interference with a sensitive electrical component in the wireless power receiving device when the wireless power transmission frequency lies in a sensitive frequency band associated with the component. Measurement circuitry in the wireless power receiving device can measure the wireless power transmission frequency. In response to determining that the wireless power transmission frequency lies in a sensitive frequency band, the wireless power receiving device may send an in-band wireless power level adjustment request to the wireless power transmitting device. The request causes a frequency adjustment that moves the wireless power transmission frequency out of the sensitive band.