RFID Circuit Power Management via Motion-Triggered Mode Switching
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Solution Overview
Problem
Existing technologies lack an effective method to conserve battery power in continuous operation electronic devices, particularly those used for transmitting RFID signals, as they often require high power consumption for continuous functionality and motion sensing.
Innovation Solution
A circuit and method utilizing a microprocessor, multi-axis accelerometer, gyroscope, and radiofrequency component, where the microprocessor operates in multiple modes to manage power consumption, with the accelerometer and gyroscope activated only when necessary, and the radiofrequency component transmitting data at 2.4 GHz, optimizing power usage across sleep, sampling, analysis, monitoring, and transmission modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the circuit operates continuously to transmit RFID signals and sense motion, then the device maintains continuous functionality, but the battery power is depleted rapidly
Solution Approach 1:
The circuit operates in segmented time intervals by dividing operation into distinct modes (sleep mode, sampling mode, analysis mode, monitoring mode, transmission mode). Each mode activates only the necessary components for that specific task, segmenting the continuous operation into power-efficient intervals rather than continuous full operation.
Solution Approach 2:
The circuit dynamically adjusts its operational state by transitioning between different modes based on detected motion and transmission needs. The microprocessor dynamically switches between sleep mode for power conservation and active modes for functionality, making the power consumption profile adaptive rather than static.
2Measurement precision
If the microprocessor and sensors operate continuously to detect motion and transmit signals, then motion sensing accuracy is maintained, but power consumption increases significantly
Solution Approach 1:
The circuit performs preliminary sampling of motion data during sampling mode before full analysis. The accelerometer samples motion continuously at low power, and only when motion is detected does the system transition to analysis mode for processing, performing preliminary actions that reduce the need for continuous high-power operation.
Solution Approach 2:
The circuit employs periodic sampling of motion data during sleep mode transitions. Instead of continuous monitoring, the accelerometer samples motion periodically at defined intervals, and the microprocessor periodically checks for motion events, reducing power consumption while maintaining detection capability.
3Reliability
If the radiofrequency component transmits data continuously to maintain connection, then communication reliability is improved, but battery power depletes faster
Solution Approach 1:
The circuit maintains continuous operational capability by keeping the microprocessor and accelerometer in low-power sampling mode continuously, while the radiofrequency component remains in sleep mode. The useful action of motion detection continues uninterrupted, but the power-intensive transmission function remains dormant until needed.
Solution Approach 2:
The system changes operational parameters by transitioning between different power modes with distinct performance characteristics. During sleep mode, the microprocessor operates at minimal power; during transmission mode, the radiofrequency component activates at full power. This parameter change allows optimization of power consumption based on actual transmission needs.
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 significantly reduces power consumption, allowing devices to operate for extended periods with minimal battery drain, consuming less than 600 nano-amps in sleep mode, less than 15 micro-amps in sampling mode, less than 50 micro-amps in analysis mode, and less than 12 milli-amps in transmission mode, while maintaining continuous operation and accurate motion tracking.
Implementation Method 1
a multi-axis accelerometer for determining movement
Implementation Method 2
a gyroscope for monitoring movement
Implementation Method 3
The radiofrequency component operates at 2.4 giga-Hertz and the power for the radiofrequency component is drawn from the battery. The radiofrequency component operates during a transmission mode, transmitting a signal from the radiofrequency component during the transmission mode
Data Source
AI summary
A circuit for transmitting a RFID signal while conserving the battery power for a circuit in continuous operation is disclosed herein. The circuit includes a RFID component, a microprocessor, an accelerometer, a gyroscope and a battery. The battery preferably has no more than 225 milliamp hours of power. The accelerometer is preferably a multiple axis accelerometer. The circuit is preferably utilized with a device for shot tracking.