Multi-Tone Data Receiver for Wireless Charging
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Solution Overview
Problem
In-band communications schemes for wireless charging systems, which modulate the load across a coil to transmit data, often fail to produce detectable amplitude or phase changes, leading to unreliable data transmission between the wireless power receiving and transmitting devices.
Innovation Solution
A wireless power transmitting device with an inverter that supplies signals to an output circuit including a wireless power transmitting coil, where the data receiver includes an input stage, bandpass filter circuitry, demodulation circuitry, and a data stream combiner to extract and align data signals, and dynamically adjust impedance to improve data detection, regardless of orientation, position, or charging conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If load modulation is used to transmit data from the wireless power receiving device, then data communication is enabled, but the amplitude or phase change at the sensing circuit becomes insufficient for reliable detection
Solution Approach 1:
The patent segments the received signal into multiple frequency components using bandpass filter circuitry that separates the power frequency signal from the modulated data signal. This segmentation allows the data signal to be extracted and processed independently, improving detection reliability despite the weak modulation depth.
Solution Approach 2:
The patent introduces an intermediary processing chain including bandpass filtering, demodulation, and signal combination circuits that act as mediators between the weak modulated signal and the final detection stage. These intermediary circuits amplify and condition the signal, making the data detectable despite the insufficient direct modulation depth.
2Reliability
If the data receiver uses complex signal processing to improve detection sensitivity, then data transmission reliability improves, but device complexity increases
Solution Approach 1:
The sensing circuit is designed to perform multiple functions: it detects both the power transfer status and the modulated data signal using the same hardware infrastructure. The bandpass filter circuitry and demodulation circuits serve dual purposes of signal conditioning and data extraction, reducing overall system complexity while maintaining high reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the detected data signal is used to adjust and optimize the detection parameters in real-time. The system continuously monitors the signal quality and adapts the filtering and demodulation parameters to maintain optimal detection reliability despite varying operating conditions.
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 enables accurate and reliable data transmission between devices, enhancing detection sensitivity and reducing interference, thereby improving the overall data communication efficiency in wireless charging systems.
Implementation Method 1
a wireless power transmitting device such as a device with a charging surface wirelessly transmits power to wireless power receiving device
Implementation Method 2
a switching circuit that is coupled to the coil in the wireless power receiving device is used to modulate the load across the coil
Data Source
AI summary
A wireless power transmitting device transmits wireless power signals modulated at a given power frequency to a wireless power receiving device using a wireless power transmitting coil. The wireless power receiving device may transmit data signals to the wireless power transmitting device. The wireless power transmitting device may include a data receiver that is coupled to the wireless power transmitting coil and that receives the transmitted data. The data receiver may include an input stage, bandpass filter circuitry, demodulator circuitry, and a data stream combiner. The bandpass filter circuitry may include at least two bandpass filter circuits for passing through signals at the power frequency and some harmonic of the power frequency. The demodulator circuitry may extract amplitude and phase information from the bandpass filtered signals and to generate multiple demodulated data streams. The data stream combiner may correlate the demodulated data streams and combine the correlated data streams.