Wireless Device Energy Harvesting Transmission Control
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Solution Overview
Problem
Existing wireless devices using energy harvesting face challenges in improving functionality, convenience, and security, particularly in efficiently converting operational energy into wireless signals and managing transmission permissions.
Innovation Solution
A wireless device with an operation unit, power generating unit, signal generating unit, storage unit, and transmission control unit that nonvolatilely stores and compares signals to permit transmission only when a predetermined condition is met, enhancing security and reducing radio wave interference by effectively utilizing generated power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If energy harvesting is used to power wireless transmission, then energy autonomy is improved, but transmission reliability deteriorates due to insufficient power for sustained operation
Solution Approach 1:
The system accumulates operation signals and their waveforms in advance in the storage unit before transmission. When transmission conditions are met, the pre-stored signals are transmitted immediately, eliminating the need for real-time signal generation during transmission and ensuring reliable transmission despite limited power availability.
Solution Approach 2:
The wireless device uses its own generated electric power from the power generating unit to operate the storage unit and transmission unit, creating a self-sufficient system that doesn't require external power sources while maintaining transmission capability through efficient energy utilization.
2Productivity
If transmission is performed frequently to improve functionality, then system responsiveness is improved, but radio wave interference increases
Solution Approach 1:
The transmission unit operates periodically based on accumulated operation signals rather than continuously. Transmission occurs at specific intervals when predetermined conditions are met, reducing overall transmission frequency and radio wave interference while maintaining system responsiveness through timely transmission of accumulated data.
3Volume of moving object
If power generating unit size is reduced to improve device portability, then device compactness is improved, but power generation capability deteriorates
Solution Approach 1:
The storage unit continuously accumulates operation signals and waveforms generated during device operation. This continuous accumulation compensates for the limited power generation capability of the compact power generating unit by gathering sufficient data over time for transmission when conditions permit.
Solution Approach 2:
The system changes the timing parameter of transmission, delaying transmission until predetermined conditions are met rather than transmitting immediately. This allows the compact power generating unit to accumulate sufficient energy and the storage unit to accumulate sufficient signals, enabling transmission despite the small power generation capacity.
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
The solution enables an efficient and secure wireless control system that effectively uses energy harvesting for improved functionality and reduced radio wave interference, while ensuring high-security operations by managing transmission permissions based on predetermined conditions.
Implementation Method 1
a power generating unit that generates electric power by operation on the operation unit
Data Source
AI summary
A wireless device 101 is a wireless device having identification information, and includes: an operation unit 11; a power generating unit 12 that generates electric power by operation on the operation unit 11; a signal generating unit 13 that operates by using the electric power generated by the power generating unit 12 and is capable of outputting a signal of a kind corresponding to the content of each operation on the operation unit 11; a storage unit 15 that operates by using the electric power generated by the power generating unit 12 and nonvolatilely stores the content of an output signal of the signal generating unit 13, the identification information, and reference information; and a transmission control unit 14 that compares the content of the output signal with the reference information when the operation on the operation unit 11 satisfies a predetermined condition, the content of the output signal and the reference information being stored in the storage unit 15, and transits to a transmission permission state in which transmitting a wireless signal including the identification information stored in the storage unit 15 to a different device is permitted when a result of the comparison satisfies a predetermined condition.