Wearable Sensor Wireless Power Control for Directional Stability
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Solution Overview
Problem
Conventional wireless power supply sensing systems face instability in power delivery due to changes in the power receiving direction of wearable sensors, leading to potential disruptions in data collection.
Innovation Solution
A wireless power supply sensing system that includes a transceiver with a controller and antenna capable of adjusting power supply modes based on charge amount and power consumption, using high-frequency oscillators to transmit power and control information to wearable sensors, ensuring stable operation even when power receiving directions change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If wireless power supply is used for wearable sensors, then battery charging and replacement are eliminated, but power supply stability deteriorates due to directional changes
Solution Approach 1:
The system performs preliminary actions by having the sensor transmit power reception state information before power instability occurs. The transmitter then proactively changes power transmission parameters in advance to prevent power supply instability, rather than reacting after the problem manifests.
Solution Approach 2:
The system establishes a feedback loop where the sensor continuously transmits power reception state information to the transmitter. The transmitter receives this feedback and dynamically adjusts power transmission parameters based on the actual power reception conditions, ensuring stable power supply despite directional changes.
2Reliability
If power transmission parameters are continuously adjusted, then power supply stability improves, but communication overhead increases
Solution Approach 1:
The system applies partial action by adjusting power transmission parameters only when necessary, based on the power reception state information received from the sensor. Instead of continuous adjustment, the transmitter monitors the feedback and makes targeted parameter changes only when power reception conditions warrant intervention, reducing unnecessary communication overhead.
3Weight of moving object
If wearable sensors are made lightweight, then user comfort improves, but power generation capability from energy harvest decreases
Solution Approach 1:
The system applies universality by using the wireless power supply mechanism to serve multiple functions: it provides primary power to the lightweight sensor and simultaneously charges the power storage unit. This eliminates the need for large energy harvest devices while ensuring sufficient power availability through the wireless transmission and storage combination.
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 stable information collection and efficient power management for wearable sensors by dynamically adjusting power supply modes, eliminating concerns of power outages due to directional changes.
Implementation Method 1
The high frequency power generated by oscillator 102 is radiated from antenna 103 as an electromagnetic wave
Implementation Method 2
The received high frequency power is converted to DC power
Data Source
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AI summary
The wireless power supply sensing system includes a transmitter/receiver and a power reception sensor. The transmitter/receiver has: an oscillation unit for generating electrical power; and a control unit for causing electrical power to be radiated into space and instructing an electrical power supply operation by the power reception sensor. In a first mode, in which the charge amount of a secondary cell is equal to or higher than a threshold value, the control unit controls the power reception sensor so that the electrical power received by the power reception sensor is supplied to a sensor unit, and in a second mode, in which the charge amount of the secondary cell is less than the threshold value, the control unit controls the power reception sensor so that the electrical power received by the power reception sensor is supplied to the secondary cell.