RFID Chip Impedance Matching for Energy Transmission
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Solution Overview
Problem
Existing radio frequency identification (RFID) chips face energy transmission inefficiencies due to varying signal power, leading to significant energy losses as the input impedance of the circuit does not match the antenna's impedance, especially when the signal power is high.
Innovation Solution
A method involving a control system and voltage converter that momentarily derives the signal to define an optimal input voltage for the converter, matching its impedance to the rectifier's output impedance, allowing for efficient energy transmission to the electrical element by redirecting the DC signal and adjusting the input voltage accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the chip is configured to transmit energy to the electrical element when the received signal is weak, then the chip can operate with weak signals, but when the power of the received signal is higher, energy losses are significant due to impedance mismatch
Solution Approach 1:
The patent applies dynamics by making the input impedance of the electrical element adjustable rather than fixed. The impedance is modified according to the power of the received signal, allowing the system to adapt to varying signal conditions. This resolves the contradiction by enabling optimal energy transfer both at weak signal levels (for reliable operation) and at high signal levels (to minimize energy loss).
Solution Approach 2:
The patent changes the parameter of input impedance based on the received signal power. By modifying the impedance parameter dynamically, the system achieves maximum energy transfer efficiency across different operating conditions, eliminating the energy loss problem that occurs with fixed impedance configurations.
2Loss of energy
If the input impedance of the electrical element is modified to adapt to the antenna's impedance, then maximum energy transmission is achieved, but this requires additional energy for impedance modification methods such as perturbation and observation
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple impedance values that correspond to different signal power levels. Instead of using energy-intensive real-time optimization methods like perturbation and observation, the system has impedance values prepared in advance, allowing quick switching to the appropriate impedance based on the received signal power without additional energy consumption for modification.
Solution Approach 2:
The patent uses a simple, low-cost impedance modification approach by selecting from pre-defined impedance values rather than employing complex, energy-intensive optimization algorithms. This 'cheap' solution in terms of energy consumption achieves sufficient energy transmission efficiency without the overhead of sophisticated real-time adaptation methods.
3Loss of energy
If the antenna and electrical element are associated to match their impedances, then maximum energy can be transmitted to the electrical element, but the antenna's impedance varies with signal power, making fixed association insufficient
Solution Approach 1:
The patent resolves the adaptability issue by making the electrical element's input impedance dynamic rather than fixed. The impedance is adjusted according to the received signal power level, allowing the system to maintain optimal impedance matching across varying operating conditions. This dynamic adaptation ensures maximum energy transmission regardless of whether the signal is weak or strong.
Solution Approach 2:
The patent implements periodic impedance adjustment by monitoring the received signal power and switching between different pre-defined impedance values. This periodic adaptation ensures that the impedance matching is maintained as conditions change, resolving the contradiction between fixed association and the need for adaptability to varying signal powers.
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 constant maximization of energy transmission to the electrical element regardless of signal power variations, reducing energy loss and adapting to changing signal conditions without requiring direct power measurement, suitable for small-sized RFID chips.
Implementation Method 1
the chip 1 comprises a voltage rectifier 3 to convert the signal received by the antenna 2 in alternating voltage into a DC voltage
Data Source
AI summary
A method and device for transmitting (20) to an electrical element (4) the power of a radio frequency type signal received by a radio frequency receiver (1), e.g., a radio frequency identification (RFID) chip, the receiver (1) having a receiving antenna (2) and a voltage rectifier (3) of the signal received by the antenna (2), the transmission device (20) including a voltage converter (30) connected to the rectifier (3) of the chip and to the electrical element (4). The device includes a control system (40) configured to momentarily derive the signal from the rectifier (3) in order to define an optimal input voltage of the converter (30) for which the input impedance of the converter corresponds to the output impedance of the rectifier (2), and to redirect the DC signal to the voltage converter (30) by providing the converter with an input voltage setpoint corresponding to the optimal voltage.