Dynamic Power Management for RFID Readers
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Solution Overview
Problem
Conventional RFID readers have fixed power consumption levels, limiting the ability to manage and optimize power usage, which can impact transaction times and energy efficiency.
Innovation Solution
The RFID reader system includes an RFID controller, excitation signal transmitter, response signal receiver, optional detector, host interface, and user interface, allowing for the establishment of multiple power consumption levels and dynamic switching between them, using techniques such as sleep states, pulsing excitation signals, and reducing power to specific components based on demand or circumstances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the RFID reader operates at a fixed power consumption level set by the manufacturer, then the device can be manufactured and deployed, but the ability to manage and optimize power usage is limited
Solution Approach 1:
The patent implements dynamic power consumption management by enabling the RFID reader to switch between multiple power levels (first power consumption level and second power consumption level) based on operational conditions. This transforms the static power consumption characteristic into a dynamic parameter that can be adjusted in real-time, resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The invention changes the power consumption parameter from a fixed value to a variable that can be adjusted between at least two different levels. This parameter change enables flexible power management while maintaining relatively simple implementation through controlled transitions between predefined power states.
2Productivity
If the RFID reader uses higher power consumption levels, then transaction processing speed may improve, but energy efficiency decreases
Solution Approach 1:
The system dynamically adjusts power consumption levels based on operational needs, allowing the RFID reader to operate at higher power levels when transaction processing speed is prioritized and switch to lower power levels when energy efficiency is more important, thus resolving the contradiction between productivity and energy efficiency.
Solution Approach 2:
The patent employs periodic switching between different power consumption levels, allowing the system to alternate between high-performance modes and energy-saving modes based on transaction demands, thereby achieving a balance between productivity and energy efficiency over time.
3Loss of time
If the RFID reader operates continuously at full power, then response time is minimized, but power consumption increases
Solution Approach 1:
The invention uses periodic action by implementing sleep states where the RFID reader operates at reduced power levels during idle periods and transitions to full power only when needed for transactions. This periodic switching minimizes response time losses while significantly reducing overall power consumption compared to continuous full-power operation.
Solution Approach 2:
The system performs preliminary actions by preparing to transition from sleep state to active state in advance of actual transaction needs, allowing quick wake-up and minimal response time penalty while spending most time in low-power mode, thus resolving the contradiction between response time and power consumption.
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 reduced power consumption, increased energy efficiency, and minimized radiated emissions, while allowing for flexible system design and operation by adjusting power levels based on usage patterns or emergencies, thereby preserving backup power during outages.
Implementation Method 1
The RFID reader may be connected to an electrical power source, such as an AC power line, which powers the RFID reader. Alternatively, the RFID reader may be powered by a self-contained power source such as a disposable or rechargeable battery.
Implementation Method 2
The RFID device must be powered during the response mode. In many RF transponder systems the RFID device is passive, that is, the RFID device lacks an internal power source or physical connection to an external power source. The passive RFID device is powered remotely by the RFID reader
Data Source
AI summary
Power consumption management for a radio frequency identification (RFID) reader for a radio frequency (RF) transponder system. The RF system includes an RFID device and a host. The RFID reader includes an RFID controller, an excitation signal transmitter, a response signal receiver, an optional RFID device detector, a host interface input/output, and a user interface. The method includes establishing a first power consumption level for the RFID reader, establishing a second power consumption level that is different from the first, and changing between the first level and the second level. The difference between the first level and the second level is derived from at least one technique for power consumption management. A plurality of techniques are presented. Among the potential benefits to reduced power consumption are increased energy efficiency and reduced radiated emissions. The option of choosing between power consumption levels presents unique opportunities in system design, implementation, and operation.