RFID Wire Line Powering via Rectified Data Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing contactless RFID communication systems face challenges in powering second electronic circuits, such as SIM cards, due to insufficient energy from electromagnetic fields and high current consumption, which limits the implementation of 4/20 mA interfaces and requires additional power lines, especially when external accumulators fail.
Innovation Solution
A method that uses a single wire line to transmit coded high frequency data signals containing data, clock information, and electrical energy to power second electronic circuits, employing modified Miller Coding and rectification to provide nearly continuous power supply, with energy storage via capacitors and optional Phase Locked Loop circuits for clock signal derivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electromagnetic field energy is used to power the second electronic circuit, then wireless power transmission is achieved, but the energy is insufficient for high current consumption interfaces
Solution Approach 1:
The patent combines data transmission and power transmission into a single wire line interface. The first electronic circuit transmits both data signals and power signals through the same physical medium (Signal-In or Signal-Out line), eliminating the need for separate power lines and solving the limitation of insufficient wireless power for high-current applications.
Solution Approach 2:
The communication interface lines are designed to serve multiple functions: data transmission, clock signal transmission, and power transmission. This multi-functionality allows the limited wire lines (only two available in NFC-WI interface) to support both communication and power supply requirements without needing additional dedicated power lines.
2Power
If additional wire lines are added for power supply, then power supply capability is improved, but the number of available communication lines is reduced
Solution Approach 1:
The patent merges power transmission with data transmission by utilizing the existing Signal-In or Signal-Out lines for both purposes. By superimposing power signals on top of data signals in the same physical medium, the invention provides power supply capability without increasing the number of wire lines, thus avoiding the trade-off between power capability and interface complexity.
3Power
If 4/20 mA interface is implemented for power supply, then power transmission capability is improved, but the current consumption is too high for contactless RFID systems
Solution Approach 1:
The patent changes the electrical parameters of the transmitted signal by superimposing a high-frequency carrier signal (from the NFC communication) with the power signal. This allows the system to provide sufficient power transmission capability while maintaining lower average current consumption compared to traditional 4/20 mA interfaces, as the power is delivered through the existing communication protocol rather than requiring continuous high current.
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 reliable power supply to second electronic circuits, like SIM cards, even without external accumulators, allowing data reading and secure operations within contactless RFID systems, reducing the need for additional power lines and improving energy efficiency.
Implementation Method 1
Passive transponders take the electrical energy required for their own power supply from an electromagnetic field provided by the at least one base station. If the communication device is moved into the electromagnetic field provided by the reader/writer device, a current is induced in the large area coil
Implementation Method 2
The second electronic circuit comprises rectifier means for rectifying said coded high frequency data signal in said second electronic circuit after transmission via said communication interface to provide a rectified power signal containing electrical energy
Data Source
Figure 1~2
AI summary
A method of supplying electrical energy from a first electronic circuit (10) to a second electronic circuit (20) connected via a communication interface (30), which interface (30) comprises at least one wire line (31) within a Radio Frequency Identification communication device (1), the method comprising the steps of: providing a coded high frequency data signal (S1) in the first electronic circuit (10); transmitting said coded high frequency data signal (S1) containing data and clock information via said communication interface (30) from said first electronic circuit (10) to said second electronic circuit (20); rectifying the transmitted coded high frequency data signal (S1) via rectifier means (21) in said second electronic circuit (20) to provide a rectified power signal (RS); and supplying the electrical energy contained in the rectified power signal (RS) to the second electronic circuit (20).