RFID Circuit Power Management via Accelerometer-Triggered Sleep Modes
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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 activating and deactivating these devices can lead to power depletion and require sophisticated components with varying power needs.
Innovation Solution
A circuit comprising a microprocessor, multi-axis accelerometer, and radiofrequency component that operates in sleep, sampling, analysis, and transmission modes to efficiently manage power consumption, using a battery with 225 milliamp hours of power, with the microprocessor and radiofrequency component only active during specific modes to minimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device operates continuously to transmit RFID signals, then the functionality is maintained, but the battery power is depleted quickly
Solution Approach 1:
The device alternates between sleep mode and active modes (sampling, analysis, monitoring, transmission) in periodic cycles. The microprocessor enters sleep mode to conserve power, then periodically wakes to perform sensing, analysis, and transmission tasks, thereby maintaining continuous operation capability while significantly reducing average power consumption.
Solution Approach 2:
The device dynamically adjusts its operational state based on detected conditions. The accelerometer dynamically transitions the system between different power states (sleep, sampling, analysis, monitoring, transmission modes), allowing the device to adapt its power consumption to actual usage requirements rather than operating at full power continuously.
2Use of energy by moving object
If the device is deactivated to save power, then battery life is extended, but the device cannot sense or transmit motion information
Solution Approach 1:
The device performs preliminary sensing actions during sampling mode using the accelerometer before entering deeper sleep states. This preliminary detection of motion allows the system to wake and perform necessary transmissions only when actual motion is detected, avoiding unnecessary power consumption while ensuring motion information is captured.
Solution Approach 2:
The accelerometer serves as a self-waking trigger that automatically detects motion and initiates the transition from sleep mode to active modes without external intervention. The system uses its own sensing capability to determine when power should be increased, creating a self-regulating power management mechanism.
3Reliability
If the microprocessor and radiofrequency component are always active, then data transmission is reliable, but power consumption increases significantly
Solution Approach 1:
The operational workflow is segmented into distinct modes: sleep mode, sampling mode, analysis mode, monitoring mode, and transmission mode. The microprocessor and radiofrequency component are only active during specific segments (sampling, analysis, monitoring, transmission) rather than continuously, allowing reliable data handling to occur in discrete intervals while conserving power during idle periods.
Solution Approach 2:
While the device appears to be in sleep mode, the system maintains continuous operational readiness through periodic wake cycles. The useful actions (sensing, analyzing, transmitting) are performed continuously in a cyclic manner, ensuring no motion events are missed while allowing power-saving intervals between actions.
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 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.