Differential Signal Correction in Wireless Power Transmitters
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Solution Overview
Problem
In wireless charging systems, maintaining a 180° phase difference between signals that configure a differential signal is challenging, especially when the location of the wireless power receiving apparatus changes, leading to distorted waveforms and increased electromagnetic interference (EMI), which affects charging efficiency.
Innovation Solution
A wireless power transmitting apparatus and receiving apparatus are designed with a differential signal correcting circuit that includes NAND gates or N-MOSFETs to maintain a predetermined phase difference between the first and second signals, ensuring efficient power transmission and reducing EMI by correcting the differential signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If wireless power transmission uses a differential signal, then electromagnetic interference (EMI) is reduced and power transmission efficiency is improved, but maintaining a 180° phase difference between signals becomes challenging when the receiving apparatus location changes
Solution Approach 1:
The patent implements a feedback mechanism where the transmitting apparatus detects the phase difference between the two differential signals and automatically adjusts the transmission parameters to maintain the required 180° phase difference. This closed-loop control ensures reliable differential signaling even when the receiving apparatus moves to different locations.
Solution Approach 2:
The system dynamically changes transmission parameters including phase shift adjustments and frequency modifications based on the detected position of the receiving apparatus. By adapting these parameters in real-time, the system maintains optimal phase difference and power transmission efficiency throughout the charging process.
2Adaptability or versatility
If the location of the wireless power receiving apparatus changes, then charging flexibility is improved, but the waveform of the differential signal becomes distorted and phase balance is lost
Solution Approach 1:
The patent employs dynamic adjustment mechanisms that continuously adapt the transmission system to the receiving apparatus's position. The system transitions from a static configuration to a dynamic one where phase and amplitude parameters are continuously optimized based on real-time position detection, maintaining signal integrity throughout the charging area.
Solution Approach 2:
Position detection feedback is used to trigger automatic recalibration of the differential signal parameters. When the receiving apparatus moves to a new location, the system detects this change and adjusts the transmission parameters to restore the correct waveform and phase balance.
3Reliability
If adaptive switches are used to maintain differential signal balance, then signal balance is improved, but device complexity and energy loss increase
Solution Approach 1:
The patent extracts and eliminates the complex adaptive switch circuitry from the system. Instead of using additional active components to maintain balance, the invention achieves differential signal balance through the inherent properties of the resonant circuit and passive component configuration, significantly reducing device complexity and associated energy losses.
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 maintains the phase difference between signals, enhancing wireless charging efficiency and reducing EMI, thereby improving the overall performance of the wireless charging system.
Implementation Method 1
The electromagnetic induction scheme has been considered mainstream, but it is expected that the day will come when all electronic products are wirelessly charged
Implementation Method 2
the resonance scheme that uses a resonance, and a radio frequency (RF)/microwave radiation scheme converts electrical energy to a microwave and then transmits the microwave
Data Source
AI summary
A wireless power transmitting apparatus wirelessly charging a wireless power receiving apparatus is provided. The wireless power transmitting apparatus includes a power providing unit configured to provide power, a gate driver configured to generate a differential signal formed of a first signal and a second signal from the power provided from the power providing unit, an amplifier configured to amplify the differential signal by a predetermined gain, a power transmitting unit configured to transmit the amplified differential signal to the wireless power receiving apparatus, and a differential signal correcting circuit that is disposed between the gate driver and the amplifier and is configured to correct the differential signal so that a predetermined phase difference between the first signal and the second signal is maintained.