Wireless Power Transmitter Sampling Controller
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Solution Overview
Problem
In wireless power transmission systems, the accuracy of signal modulation and demodulation is influenced by the positional relationship between the transmitter and receiver, and increasing the sampling frequency to improve accuracy leads to increased cost, size, and power consumption.
Innovation Solution
A wireless power transmitter with a sampling controller that sets different retrieval sampling points for each section of the carrier frequency signal, allowing the sampling unit to sample at optimal points, thereby determining the best sampling point based on comparisons, and adjusting these points based on operational conditions such as frequency changes or load voltage/current levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sampling frequency is increased to improve the accuracy of modulation and demodulation, then the measurement precision is improved, but the cost, required size, and power consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-selecting optimal sampling points from multiple candidate points before actual sampling occurs. The sampling controller identifies and stores the best sampling points in advance, so that when sampling is needed, the system can directly use these pre-determined points rather than requiring continuous high-frequency sampling. This preliminary selection process enables accurate signal capture at lower sampling frequencies, thereby reducing the hardware requirements, cost, and power consumption while maintaining measurement precision.
2Measurement precision
If the sampling frequency is increased to improve the accuracy of signal detection, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The system performs preliminary action by pre-identifying and storing optimal sampling points before actual signal detection. The sampling controller evaluates multiple candidate sampling points and determines the best ones in advance, storing them for later use. This approach simplifies the device complexity because the sampling controller only needs to retrieve and use the pre-determined optimal points rather than implementing complex real-time high-frequency sampling circuits, thereby achieving accurate signal detection with simpler hardware.
3Measurement precision
If multiple candidate sampling points are evaluated and compared, then the measurement precision is improved, but the loss of time increases
Solution Approach 1:
The patent resolves this contradiction by performing the evaluation and comparison of multiple candidate sampling points as a preliminary action during idle periods or when system conditions change, rather than doing it continuously in real-time. The sampling controller stores the results of these comparisons for future use. This timing strategy allows the system to invest time in accurate sampling point selection when it doesn't impact real-time performance, thereby achieving high measurement precision without causing time loss during actual signal detection operations.
Data Source
AI summary
A wireless power transmitter includes a sampling controller setting different retrieval sampling points of time for each section, among candidate sampling points of time, in each section of a carrier frequency signal; and a sampling unit configured to sample points of the carrier frequency signal at the different retrieval sampling points of time. The sampling controller compares values sampled by the sampling unit with each other, and determines a determined sampling point based on a comparison result.


