Orthogonal Code Wireless Power Transfer
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Solution Overview
Problem
Conventional wireless power transfer systems are limited by their one-to-one operation, vulnerability to attacks, and narrow frequency band restrictions, which hinder scalability and security, especially in the context of the Internet of Things (IoT) where multiple devices require efficient and secure power transfer.
Innovation Solution
The implementation of a device and method for wireless power transfer using digital controllers and transceivers that generate switch control signals based on orthogonal code sequences, enabling multiple access wireless power transfer by shaping waveforms according to predetermined code sequences, thus allowing multiple transmitters and receivers to operate simultaneously without interference and enhancing security through spread-spectrum modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional single-frequency wireless power transfer is used, then power transfer is achieved between two devices, but multiple transmitters and receivers cannot operate simultaneously without mutual interference
Solution Approach 1:
The single frequency band is segmented into multiple orthogonal code sequences (e.g., Hadamard codes, Walsh codes). Each transmitter-receiver pair is assigned a unique orthogonal code, allowing multiple pairs to operate simultaneously on the same frequency without interference. The wireless power transfer signal is modulated by these orthogonal codes, creating distinct signal spaces for each pair.
Solution Approach 2:
The system transitions from operating in a single frequency dimension to operating in a multi-dimensional code space. By introducing orthogonal code sequences as an additional dimension, multiple transmitters and receivers can coexist on the same frequency, effectively increasing system capacity without adding frequency bands.
2Reliability
If narrow frequency band operation is used to comply with regulatory restrictions, then power transfer is achieved, but bandwidth for embedded communications is limited and component tolerances must be very tight
Solution Approach 1:
The system uses spread-spectrum modulation with orthogonal code sequences that dynamically spread the power transfer signal across a wider frequency range around the carrier frequency. This dynamic spreading allows the system to comply with narrow band regulatory restrictions while effectively utilizing a broader spectrum, thereby increasing communication bandwidth and reducing sensitivity to component tolerances.
3Power
If single-frequency operation is used, then power transfer is achieved, but the system is vulnerable to attacks by powerful transmitters and has limited security
Solution Approach 1:
The system converts the potential harm of narrow band operation into a benefit by using orthogonal code sequences. The orthogonality property ensures that even if an attacker transmits at high power on the same frequency, the orthogonal codes create signal spaces that are mathematically independent, making it difficult for attackers to disrupt or eavesdrop on legitimate communications without being detected.
4Power
If conventional wireless power transfer is used, then power transfer is achieved, but scalability to thousands of devices as required by IoT architectures is not possible
Solution Approach 1:
The orthogonal code sequence assignment mechanism provides a universal framework that can accommodate any number of transmitter-receiver pairs. The same frequency band and basic hardware architecture can support multiple simultaneous power transfer operations by simply assigning different orthogonal codes, enabling scalable deployment for IoT applications without requiring additional frequency bands or complex hardware modifications.
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 enables scalable, secure, and efficient wireless power transfer by allowing multiple devices to operate on the same frequency range without interference, improving tolerance to component variations and embedding secure communication within the power transfer process.
Implementation Method 1
a transceiver configured to generate a wireless signal for the wireless power transfer
Data Source
AI summary
A device configured for wireless power transfer includes a digital controller configured to generate a plurality of switch control signals, and a transceiver configured to generate a wireless signal for the wireless power transfer. The transceiver includes a plurality of switches, each switch of the plurality of switches being responsive to a respective switch control signal of the plurality of switch control signals such that the wireless signal has a waveform shaped in accordance with a code sequence for the wireless power transfer. The code sequence is one of a set of predetermined code sequences, each predetermined code sequence being orthogonal to each other predetermined code sequence of the set of predetermined code sequences.