RF Power Limiter for RFID Voltage Stability
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Solution Overview
Problem
Conventional RFID devices are prone to sudden shutdown due to excessive power consumption, leading to errors and failures when the available power from RF signals is insufficient to maintain stable voltage levels.
Innovation Solution
An electronic device with a limiter mechanism that controls the supply voltage by varying the load at the input node, using the limiter current as an indicator to manage power consumption, allowing for precise prediction and adjustment of power usage based on available power and internal component needs, and optionally utilizing a buffer capacitor for energy storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power consumption of internal components is increased to improve processing capability, then productivity is improved, but the device becomes unstable and shuts down when available power is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the limiter current magnitude is continuously monitored and used to control the power consumption of internal components. The power control stage receives the limiter control signal and adjusts the power consumption of SYSTEM 5 dynamically based on available power, creating a closed-loop control system that prevents shutdown while optimizing processing capability.
Solution Approach 2:
The patent makes the power consumption of internal components dynamically adjustable rather than fixed. The limiter control signal SLC continuously varies the load at input node VANT1, and this variation is transferred to control the power consumption of internal components, allowing the system to adapt its processing capability to match available power in real-time.
2Stability of the object's composition
If a voltage regulator is used to maintain stable output voltage, then voltage stability is improved, but the device cannot predict available power and may still shut down
Solution Approach 1:
The patent introduces the limiter current magnitude as an intermediary parameter that bridges the relationship between available power and internal component power consumption. Instead of directly regulating voltage, the system uses the limiter current as a measurable indicator of available power and employs this information to control power consumption, enabling both voltage stability and power prediction.
Solution Approach 2:
The patent replaces traditional mechanical power regulation mechanisms with an electronic control system that uses electrical current measurements. Instead of using complex mechanical switches or relays to control power, the system uses electronic control stages that adjust power consumption based on electrical current magnitude, enabling precise and rapid power management.
3Stability of the object's composition
If the load at input node is increased to limit maximum voltage, then voltage control is improved, but power consumption increases and reduces available power for internal components
Solution Approach 1:
The patent uses feedback control where the limiter control stage monitors the voltage at input node VANT1 and adjusts the load dynamically. When voltage exceeds maximum level, the control stage increases the limiter current to reduce voltage; when voltage is adequate, the limiter current is reduced to maximize power available for internal components. This dynamic adjustment optimizes both voltage control and power availability simultaneously.
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 solution provides flexible and efficient power management by correlating power consumption with available power, preventing sudden shutdowns and optimizing operation based on the limiter current and stored energy, thereby ensuring stable operation of RFID devices.
Implementation Method 1
The RFID device can be supplied through a received RF signal (electromagnetic waves, electromagnetic field). Therefore, the RFID device 10 includes a resonance circuit 4 with a resonant inductor LR (may serve as antenna) and resonant capacitor CR. The resonant circuit is excited through an external RF signal to oscillate with an oscillation frequency. Due to this oscillation, an oscillating voltage develops on input nodes VANT1 and VANT2.
Data Source
AI summary
An electronic device is provided that is adapted to generate a supply voltage at an input node from a radio frequency (RF) signal. The electronic device includes a limiter coupled to the input node for limiting a supply voltage level at the input node that is generated by the received RF signal. The limiter is configured to draw a limiter current from the input node so as to limit the supply voltage level to a maximum and a magnitude of the limiter current is used for controlling a power consumption of the electronic device.