Wireless Power Receiver Circuit Mode Switching
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Solution Overview
Problem
Conventional wireless power transfer systems face efficiency limitations when the primary and secondary coils are too close, as resonators reduce efficiency in close-proximity scenarios and require matching devices, restricting their practical use.
Innovation Solution
A wireless power receiver with two adjustable receiver circuits: a principle receiver circuit that can operate in close-coupled or resonator modes, and a supplemental receiver circuit that can function as a power source in both modes, allowing adaptation to different wireless power supplies through variable capacitance and inductance, and communication systems for mode determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If resonators are used in mid-range wireless power transfer systems, then power transfer efficiency at greater distances is improved, but efficiency deteriorates when the wireless power supply and remote device are too close
Solution Approach 1:
The wireless power receiver is divided into two separate receiver circuits: a first receiver circuit optimized for close-coupled operation and a second receiver circuit optimized for mid-range operation with resonators. Each circuit can be independently activated based on the operating conditions, allowing the system to segment the operating range into two distinct modes.
Solution Approach 2:
The system dynamically switches between the first receiver circuit and the second receiver circuit based on the detected operating mode. The controller determines whether to activate close-coupled mode or mid-range mode and相应地 enables or disables the appropriate receiver circuit, making the system adaptable to varying distances between the power supply and remote device.
2Length of stationary object
If resonators are used to extend wireless power supply range, then mid-range power transfer is improved, but device compatibility deteriorates as matching between power supply and receiver is required
Solution Approach 1:
The wireless power receiver is designed with dual functionality, incorporating both a first receiver circuit for close-coupled operation and a second receiver circuit for mid-range resonant operation. This multi-functionality allows the single receiver device to work with both close-coupled wireless power supplies and mid-range wireless power supplies that use resonators, eliminating the need for matching between supply and receiver types.
3Loss of energy
If a single receiver circuit is designed for close-coupled operation, then efficiency at short distances is improved, but performance deteriorates at greater distances
Solution Approach 1:
The receiver is segmented into two specialized circuits: the first receiver circuit with primary coil and capacitor optimized for close-coupled operation, and the second receiver circuit with resonator components optimized for mid-range operation. Each circuit is tuned to excel at its specific operating range.
Solution Approach 2:
The second receiver circuit acts as an intermediary for mid-range power transfer, using resonators to amplify the wireless power signal and extend the effective operating distance. The resonators create a resonant coupling that bridges the gap between the power supply and the first receiver circuit, enabling efficient power transfer at distances where direct coupling would fail.
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 efficient power reception from various wireless power supplies by selectively configuring the receiver circuits to optimize performance in close-coupled and mid-range modes, improving adaptability and efficiency across a wide range of operating characteristics.
Implementation Method 1
the principle receiver circuit may be electrically disconnected/isolated from the remote device and function as a resonator to amplify the received wireless power signal
Implementation Method 2
The primary coil generates an electromagnetic field that emanates from the wireless power supply. The wireless power receiver includes a secondary coil that can be placed within the electromagnetic field generated by the primary coil. When the remote device is placed within sufficient proximity to the wireless power supply, the electromagnetic field induces power within the secondary coil
Implementation Method 3
Each resonator is configured to include an inductor and a capacitor, and does not include any additional significant load. This keeps the impedance at the resonant frequency to a minimum which maximizes the resonating current between the capacitor and inductor. The current in the inductor, in turn, amplifies the wireless power signal induced within the resonator.
Data Source
AI summary
A wireless power receiver capable of receiving wireless power from close-coupled and mid-range wireless power supplies. The wireless power receiver includes a principal and supplemental receiver circuits. The principle receiver circuit is adjustable to operate in a close-coupled mode or a resonator mode. In close-coupled mode, the principle receiver circuit is coupled to the power input of a remote device and functions as the principle power source. In resonator-mode, the principle power circuit is electrically disconnected/isolated from the remote device and forms a closed resonant loop to function as a resonator that amplifies an electromagnetic field from a mid-range wireless power supply. The supplemental receiver circuit is coupled to the power input of the remote device and is configured to receive wireless power from the resonator and function as the power source when the principle receiver circuit is in the resonator mode.