Capacitive Power Transfer Circuit for Wideband In-Band Communication
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Solution Overview
Problem
Capacitive power transfer systems face challenges in integrating in-band communication due to high system sensitivity, power transfer efficiency drops, and limited communication bandwidth, making it complex to achieve simultaneous power and data transfer effectively.
Innovation Solution
A novel compensation design using a double-sided CL topology with specific circuit components that act as a power amplifier at the power channel frequency and a high pass filter at the communication channel frequency, enabling simultaneous power and data transfer with extended communication frequency compatibility for AM, ASK, FM, and FSK communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If in-band communication is integrated into capacitive power transfer system, then communication capability is improved, but power transfer efficiency drops
Solution Approach 1:
The patent segments the frequency spectrum into distinct power transfer frequency band and communication frequency band. The communication frequency is selected to be higher than the power transfer frequency, allowing simultaneous operation of power and communication channels without mutual interference, thus maintaining power transfer efficiency while enabling communication capability.
Solution Approach 2:
The patent changes the operating frequency parameter by selecting a communication frequency higher than the power transfer frequency. This frequency parameter differentiation allows the system to achieve both power transfer and communication functions simultaneously without the communication signals interfering with power transfer efficiency.
2Loss of information
If in-band communication is integrated into capacitive power transfer system, then communication functionality is improved, but system complexity increases
Solution Approach 1:
The capacitive coupling structure serves dual purposes: it enables both power transfer and communication functions. By utilizing the same physical coupling mechanism for both power and data transmission, the system avoids adding separate complex communication hardware, thus improving communication functionality while minimizing system complexity.
Solution Approach 2:
The patent merges the power transfer and communication functions into a single integrated system using the same capacitive coupling infrastructure. The communication signals are superimposed on the power transfer signals, allowing both functions to share the same physical channel and reducing overall system complexity.
3Productivity
If communication bandwidth is extended to support multiple modulation techniques, then data transfer capacity is improved, but system sensitivity increases causing power transfer efficiency drops
Solution Approach 1:
The patent segments the frequency spectrum to dedicate higher frequencies to communication and lower frequencies to power transfer. This segmentation allows extended communication bandwidth for multiple modulation techniques (AM, FM, ASK, FSK) without the communication signals interfering with power transfer, thus improving data transfer capacity while maintaining power transfer efficiency.
Solution Approach 2:
The patent changes the frequency parameter by selecting communication frequencies higher than the power transfer frequency. This parameter differentiation enables the system to support multiple modulation techniques with extended bandwidth while preventing sensitivity issues from affecting power transfer efficiency, as the two functions operate in distinct frequency regions.
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 allows for stable and efficient simultaneous power and data transfer with increased data transfer capacity, maintaining power transfer efficiency and expanding communication bandwidth, supporting multiple data streams and various modulation techniques.
Implementation Method 1
Capacitive power transfer can employ two pairs of metal plates to form the capacitors, allowing power to be transferred using alternating electric fields.
Implementation Method 2
The one or more primary side filter components and the one or more secondary side filter components can be selected to provide power amplifier operation at a power delivery frequency
Implementation Method 3
the circuitry can have the properties of a high pass filter at the communication channel frequency
Data Source
AI summary
A capacitive power transfer system can include a power transmitter having one or more primary side filter components, a communications modulator, and transmitter capacitive couplers; and a power receiver having receiver capacitive couplers capacitively coupled to the transmitter capacitive couplers, one or more secondary side filter components, and a communication demodulator. The one or more primary side filter components and the one or more secondary side filter components can be selected to provide power amplifier operation at a power delivery frequency and act as a stable gain high pass filter above a communications cutoff frequency that is higher than the power delivery frequency.