Pulse-Width Data Encoding for Bidirectional Wireless Power Transfer
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Solution Overview
Problem
Current wireless power transfer systems require additional circuits for data communication, such as Bluetooth, which complicates the design and increases costs, especially in standards like Rezence that operate at 6.78 MHz, and existing methods like backscatter modulation are unidirectional.
Innovation Solution
A wireless power transfer system that uses pulse width encoded data communications, where the wireless receiver system encodes and transmits data using a controller to modulate the electromagnetic field, allowing for bidirectional communication without additional circuits by correlating duty cycles of pulses with periods, enabling asynchronous data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional circuits such as Bluetooth are used for data communication in wireless power transfer systems, then data communication capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies multi-functionality by enabling the wireless power transfer antenna to perform both power transfer and data communication functions. The transmitter antenna transmits both power signals and encoded data signals wirelessly, while the receiver antenna receives both power and data. This eliminates the need for separate Bluetooth or NFC circuits, directly resolving the contradiction between communication capability and device complexity.
2Adaptability or versatility
If additional circuits such as Bluetooth are used for data communication, then data communication capability is improved, but manufacturing cost increases
Solution Approach 1:
By designing the antenna system to handle both power and data transmission functions, the patent eliminates the need for additional Bluetooth chips, NFC antennas, and associated circuitry. This consolidation of functions into existing components directly reduces bill of materials costs and simplifies the manufacturing process, addressing the cost aspect of the contradiction.
3Device complexity
If backscatter modulation is used for communication, then communication is achieved using existing antenna, but communication is unidirectional only
Solution Approach 1:
The patent inverts the traditional backscatter approach by having the transmitter actively transmit encoded data signals to the receiver, rather than relying on the receiver to modulate and reflect signals back. The transmitter modulates the electromagnetic field with encoded data that the receiver detects, enabling bidirectional communication where both parties can send and receive information, thus resolving the unidirectional limitation.
4Productivity
If pulse width encoding with correlated ratios is used, then data communication efficiency is improved, but encoding complexity increases
Solution Approach 1:
The patent employs periodic pulse width modulation where data is encoded in the width of periodic pulses transmitted by the antenna. Each pulse's width corresponds to a specific data value based on correlated ratios, creating a systematic encoding scheme. This periodic approach structures the encoding process, making it manageable despite the complexity of calculating and interpreting correlated ratios, thus balancing efficiency gains with implementation feasibility.
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 efficient, bidirectional data communication within the same circuitry used for wireless power transfer, reducing costs and complexity, and supports various data formats and rates, including asynchronous communication without the need for a clock signal.
Implementation Method 1
inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field, and hence, an electric current, in a receiving element
Data Source
AI summary
A system for wireless communications includes an antenna and a controller, the antenna configured to transmit electrical data signals, the electrical data signals including an encoded message signal. The encoded message signal including one or more encoded message words. The controller is configured to encode one or more message words, of a message signal, into one or more encoded message words of the encoded message signal, based on a coding format. The coding format correlates each of a plurality of correlated ratios with one of a plurality of format words. Each of the plurality of correlated ratios is a ratio of a duty cycle of a pulse to a respective period associated with one or both of the duty cycle and the pulse. Each of the one or more encoded message words are encoded as one of the plurality of correlated ratios.