Adaptive Impedance Matching Circuit for Wireless Power Harvesting
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies due to varying impedance, which affects the power received by electronic devices, particularly in IoT applications, where precise and adaptive impedance matching is needed to maximize energy harvesting efficiency across different frequency bands and power levels.
Innovation Solution
An electronic device equipped with a first impedance matching circuit, a second impedance matching circuit, a control circuit, and a power conversion circuit, utilizing an impedance matching network model to dynamically adjust impedance values based on power and frequency, enabling fast and accurate impedance matching for efficient energy harvesting without requiring multiple antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If impedance matching is performed using fixed impedance values, then the device structure is simple, but energy harvesting efficiency decreases when impedance varies with power and frequency
Solution Approach 1:
The patent implements dynamic impedance matching by making the impedance values of the matching circuits variable rather than fixed. The impedance values are adjusted in real-time based on detected power and frequency characteristics of the received signal, allowing the system to maintain optimal energy harvesting efficiency across varying operating conditions without requiring multiple fixed impedance circuits.
Solution Approach 2:
The patent changes the impedance parameter of the matching circuits based on detected signal characteristics. By measuring power and frequency and selecting appropriate impedance values from a set of predetermined values, the system adapts to different operating conditions and maintains high energy harvesting efficiency without increasing structural complexity.
2Loss of energy
If multiple impedance matching circuits with different impedance values are used, then energy harvesting efficiency improves, but device complexity and number of components increase
Solution Approach 1:
Instead of using multiple separate impedance matching circuits with fixed impedance values, the patent employs a single impedance matching circuit with variable impedance capability. The circuit can dynamically switch between different impedance values based on the detected power and frequency characteristics, achieving the same effect as multiple circuits while reducing component count and structural complexity.
Solution Approach 2:
The patent makes a single impedance matching circuit multi-functional by enabling it to operate with multiple different impedance values. This universal circuit can adapt to various power and frequency conditions, replacing the need for multiple specialized circuits and thereby reducing overall device complexity while maintaining high energy harvesting efficiency across different operating scenarios.
3Measurement precision
If impedance matching is performed without considering power and frequency characteristics, then processing speed is fast, but measurement precision and energy harvesting efficiency decrease
Solution Approach 1:
The patent prepares a set of predetermined impedance values before actual operation. When the device receives a power signal, it can quickly select from these pre-prepared impedance values based on detected power and frequency characteristics, avoiding the need for time-consuming real-time calculation and optimization. This preliminary preparation enables both high measurement precision and fast response time.
Solution Approach 2:
The patent implements a feedback mechanism where the detected power and frequency characteristics are used to select the appropriate impedance value from predetermined options. This feedback-based selection process ensures accurate impedance matching by continuously adapting to signal conditions while maintaining fast processing speed through the use of pre-established impedance value sets rather than iterative optimization.
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 solution enhances energy harvesting efficiency by detecting frequency and power magnitude, applying optimal impedance matching, and converting AC power to DC for charging, thereby maximizing power transfer and reducing the time spent finding optimal impedance values.
Implementation Method 1
a first impedance matching circuit configured to perform first impedance matching on a power signal wirelessly received from a wireless power transmission device
Implementation Method 2
a second impedance matching circuit configured to perform second impedance matching on the first impedance-matched power signal using one of a plurality of impedance values
Implementation Method 3
a power conversion circuit configured to convert the second impedance-matched power signal in an AC form into a power in a DC form for charging a battery
Data Source
AI summary
The present disclosure relates to an artificial intelligence (AI) system which simulates functions such as cognition, judgment, and the like of the human brain by utilizing machine learning algorithms such as deep learning and the like, and to an application thereof. According to various embodiments, an electronic device may comprise: a first impedance matching circuit configured to perform a first impedance matching on a power signal wirelessly received from a wireless power transmission device; a second impedance matching circuit configured to perform a second impedance matching on the first impedance-matched power signal using any one impedance value among a plurality of impedance values; a control circuit configured to perform control to change an impedance value of the second impedance matching circuit to an impedance value learned using an impedance matching network model, corresponding to a power and a frequency of the second impedance-matched power signal; and a power conversion circuit configured to convert a second impedance-matched power signal in an AC form into a power in a DC form for charging a battery according to the changed impedance value.