Relay Device Automatic Tuning Assist Circuit
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Solution Overview
Problem
In wireless power transmission systems, maintaining resonance conditions over time is challenging due to changing coupling between antennas, requiring variable capacitors that are difficult to detect and adjust, especially in systems with multiple relay devices, and are limited by high voltage amplitudes.
Innovation Solution
A relay device with an automatic tuning assist circuit that includes a power relay coil and auxiliary capacitors, where switches are controlled to charge or discharge the capacitors synchronously with the power signal, adjusting the phase of the current to match the voltage, allowing for quasi-resonant states without needing to adjust capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If variable capacitors are used to adjust resonance conditions, then resonance can be maintained under changing coupling conditions, but the device complexity increases and the capacitors become difficult to detect and adjust
Solution Approach 1:
The relay device automatically detects resonance conditions and adjusts its own capacitance through the controller switching the switch between first and second states, without requiring external manual adjustment or complex detection systems. The device serves itself by using the controller to monitor and modify the resonance circuit parameters in real-time
Solution Approach 2:
The capacitance of the resonance circuit is made dynamically adjustable through the switch that can connect or disconnect auxiliary capacitors based on detected resonance conditions. This dynamic adjustment allows the system to adapt to changing coupling conditions between transmission and reception antennas, maintaining resonance without fixed static capacitor values
2Adaptability or versatility
If multiple relay devices are provided to extend power transmission range, then coverage is improved, but the resonance conditions become more complicated and difficult to satisfy
Solution Approach 1:
The overall power transmission system is segmented into multiple independent relay devices, each capable of autonomous resonance detection and adjustment. This segmentation allows each relay to independently maintain its own resonance conditions without requiring complex coordinated control across the entire multi-relay system, simplifying the overall resonance management
3Power
If large amount of electric power is transmitted, then power delivery capability is improved, but the voltage amplitude at the resonance circuit becomes very high which limits element selection
Solution Approach 1:
The capacitance adjustment is achieved by switching between multiple discrete capacitor configurations (first state and second state) rather than using a single high-voltage variable capacitor. This segmentation of capacitance adjustment into discrete steps allows the system to handle high power transmission by distributing the voltage stress across multiple capacitor elements that can be switched in and out of the circuit
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
Enables high-efficiency wireless power transmission by automatically tuning the circuit to maintain resonance, even with changing conditions, and avoids the need for variable capacitors, which are limited by high voltage amplitudes.
Implementation Method 1
the resonance current that flows through the resonance circuit has a phase that is delayed or otherwise advanced as compared with the resonance voltage that develops at the resonance circuit
Implementation Method 2
Wireless power transmission can be classified into three principal methods using an electromagnetic induction, an electromagnetic wave reception, and an electric field/magnetic field resonance
Implementation Method 3
The electric field/magnetic field resonance method has been receiving attention as a method for supplying electric power with relatively high efficiency at a middle range on the order of several meters
Data Source
AI summary
A relay antenna includes a power relay coil. An automatic tuning assist circuit is coupled with the relay antenna. The automatic tuning assist circuit has first and second terminals coupled with the relay antenna. Multiple switches are arranged together with N (N represents an integer) auxiliary capacitors between the first terminal and the second terminal. A controller is configured to switch on and off each of the multiple switches in synchronization with an electric power signal transmitted from a wireless power supply apparatus.