Dual-Mode Wireless Power Transfer for SWIPT Efficiency
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Solution Overview
Problem
Current simultaneous wireless information and power transfer (SWIPT) technologies, such as single tone based and PAPR based schemes, face limitations in power transfer efficiency and transfer rate due to high energy consumption and nonlinear characteristics of rectifiers, respectively.
Innovation Solution
A dual-mode wireless power transfer system employing adaptive power management and information decoding (PM-ID) policy, which selectively uses single tone or multi-tone transmission modes based on communication mode information to optimize power transfer and information decoding, utilizing phase-shift keying for single tone signals and peak-to-average power ratio for multi-tone signals, and employing multi-antennas or multi-rectennas for efficient energy harvesting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If single tone based SWIPT scheme is used, then information and power are simultaneously transferred wirelessly, but power consumption is high and wireless power transfer efficiency is low
Solution Approach 1:
The system dynamically switches between single-tone and multi-tone transmission modes based on channel conditions and power requirements. The transmitter adapts the signal structure in real-time, transitioning from single-tone (when low power is needed) to multi-tone (when high power transfer efficiency is needed), making the power transfer system dynamic and adaptable rather than static
Solution Approach 2:
The system changes the fundamental parameter of signal structure from single-tone to multi-tone based on operational requirements. By modifying the spectral composition and signal characteristics, the system optimizes both power consumption and transfer efficiency for different scenarios
2Device complexity
If PAPR based SWIPT scheme is used, then receiver complexity is reduced and energy consumption is small, but transfer rate is low due to nonlinear characteristics of rectifier
Solution Approach 1:
The system employs dynamic mode switching where the transmitter can select between single-tone and multi-tone schemes based on the desired transfer rate. When high transfer rate is required, the system switches to multi-tone transmission with appropriate modulation, while maintaining the simplicity of PAPR-based reception
Solution Approach 2:
The receiver is designed to universally handle both single-tone and multi-tone signals using the same PAPR-based detection mechanism. This multi-functional capability allows the simple receiver structure to achieve both low complexity and high transfer rate by adapting to different transmission modes
3Use of energy by moving object
If single tone transmission mode is used, then power consumption in receiver is reduced, but energy coverage is not wide
Solution Approach 1:
The system dynamically adjusts the transmission mode based on distance and power requirements. For far-distance communication where wide energy coverage is needed, the system switches to multi-tone transmission which provides broader spatial coverage. For near-field communication where low receiver power consumption is critical, it uses single-tone mode
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 enhances power transfer efficiency and extends energy coverage while maintaining low energy consumption, prioritizing transfer rate or energy harvesting based on battery state and received power, thereby supporting self-powering IoT devices effectively.
Implementation Method 1
the single tone signal as a single-frequency sinusoidal signal is a signal modulated in a phase-shift keying scheme with multi-level
Implementation Method 2
the multi-tone signal as a multi-frequency sinusoidal signal is a signal modulated in a peak-to-average power ratio scheme
Implementation Method 3
a power harvesting unit harvesting power for charging a battery of the wireless power receiving apparatus from the power signal by using an energy harvesting technique
Data Source
AI summary
Disclosed are a wireless power transfer apparatus, a wireless power receiving apparatus, a wireless power transfer method, a wireless power receiving method, a wireless power transfer system using a dual mode and a recording medium thereof. A wireless power transfer apparatus transferring data and power to a wireless power receiving apparatus by using a power signal, includes: a signal generating unit generating the power signal for transferring the data and the power; a communication unit transferring the power signal generated by the signal generating unit to the wireless power receiving apparatus and communicating with the outside; and a control unit controlling the signal generating unit and the communication unit, and the signal generating unit generates the power signal according to one communication mode of a single tone transmission mode and a multi-tone transmission mode based on communication mode information transferred from the wireless power receiving apparatus through the communication unit, and the single tone transmission mode and the multi-tone transmission mode use different modulation schemes respectively.