Sub-sampling Circuit for Resonant Power Transfer Amplitude and Phase Extraction
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Solution Overview
Problem
Existing resonant inductive power transfer systems face challenges in optimizing parameters of state variables to maintain an optimal operating point, particularly due to the need for costly and power-consuming high-speed analog-to-digital converters for fast sampling, and they lack simplicity, flexibility, and cost-effectiveness in real-time adjustments for varying loads.
Innovation Solution
A resonant power transfer system utilizing sub-sampling circuitry to sample state variables at a rate significantly lower than the RF frequency, with information recovery and control circuitry to produce parameter signals for amplitude and phase, enabling cost-effective and efficient optimization of the system's operating point through voltage regulation and switching inverter control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fast analog-to-digital converters are used to sample state variables at high frequency, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the sampling frequency parameter from high (matching RF frequency) to low (sub-sampling rate), allowing the use of simpler, lower-cost ADCs while still extracting accurate amplitude and phase information through digital signal processing of the subsampled values
Solution Approach 2:
The patent replaces the requirement for high-speed hardware sampling with a combination of low-speed sampling and digital computation, substituting complex hardware requirements with software-based signal processing to extract the same measurement information
2Measurement precision
If high-speed analog-to-digital converters are used for fast sampling, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent changes the sampling frequency parameter from high to low (sub-sampling), which directly reduces the power consumption of the ADC while maintaining measurement capability through digital processing of the fewer samples
Solution Approach 2:
The patent takes only enough samples (sub-sampling) to extract the necessary amplitude and phase information, rather than continuously sampling at full RF rate, reducing power consumption while maintaining sufficient measurement precision for control purposes
3Adaptability or versatility
If real-time optimization is implemented for varying loads, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback control by continuously monitoring the state variables (amplitude and phase extracted from subsampled values) and adjusting the inverter operating parameters in response to detected changes in load conditions, enabling real-time optimization
Solution Approach 2:
The system automatically adjusts its own operating parameters based on the extracted state variable information, enabling self-optimization without requiring complex external control systems or manual intervention
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 allows for simpler, more flexible, and cost-effective optimization of resonant wireless power transfer systems, reducing power consumption and electromagnetic interference while maintaining efficient power delivery and system adaptability to changing loads.
Implementation Method 1
resonant circuitry including an inductor coil and a resonant capacitor coupled to a first terminal of the inductor coil, wherein the inductor coil and the resonant capacitor resonate to produce an excitation signal and a state variable signal
Implementation Method 2
switching inverter circuitry producing the excitation signal in response to a regulated supply voltage and a second control signal
Data Source
AI summary
A resonant power transfer system includes resonant circuitry (26) including an inductor coil (59) and a resonant capacitor (51) coupled to a first terminal (27) of the inductor coil, wherein the inductor coil and the resonant capacitor resonate to produce an excitation signal (IS) and a state variable signal (VCS1). Sub-sampling circuitry (30) samples first and second points of the state variable signal at a rate which is substantially less than the RF frequency of the state variable signal. Information recovery circuitry (32) produces a state variable parameter signal representing a parameter (A) of the state variable signal from information in the first and second sampled points. Control circuitry (38) produces a first control signal in response to the state variable parameter signal. Detection and optimization circuitry (41) produces a second control signal in response to the state variable parameter signal. Voltage regulation circuitry (45) produces a regulated supply voltage in response to the first control signal. Switching inverter circuitry produces the excitation signal in response to the regulated supply voltage and the second control signal.