RF Tag Receiver Voltage Regulation Circuit
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Solution Overview
Problem
RF tags face issues with AC/DC converters that contribute to stray capacitance and are prone to damage from high voltage, leading to signal distortion and loss of information due to clipping solutions.
Innovation Solution
A receiver unit with a voltage converter and regulation circuit that limits output voltage, using a shunt voltage regulator and limiter circuit to manage current and prevent voltage surges, while maintaining signal integrity through a control signal and current mirror circuits for dual-frequency operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional AC/DC converter is used in the RF tag, then power conversion function is achieved, but stray capacitance increases disrupting antenna characteristics
Solution Approach 1:
The patent extracts and removes the harmful stray capacitance contribution from the AC/DC converter by using a specific circuit topology with MOS transistors configured to minimize parasitic capacitance. The converter design separates the power conversion function from the harmful capacitance effect, allowing the antenna to operate with its optimal tuning capacitor value不受干扰.
2Reliability
If clipping is applied to protect AC/DC converter from high voltage, then component damage is prevented, but signal distortion occurs causing information loss
Solution Approach 1:
The patent introduces a regulation circuit as an intermediary between the antenna and the AC/DC converter. This regulation circuit includes a regulator that monitors voltage and a limiter that controls the input voltage to the converter, preventing high voltage damage without clipping the signal. The intermediary circuit manages voltage levels dynamically, protecting components while preserving signal integrity and information.
3Power
If AC/DC converter operates at high power, then power supply capability is improved, but voltage surges cause component destruction
Solution Approach 1:
The patent implements a feedback mechanism through the regulation circuit that continuously monitors the voltage output of the AC/DC converter and adjusts the input voltage accordingly. When high power operation causes voltage to approach dangerous levels, the feedback signal activates the limiter to reduce input voltage, preventing voltage surges and component destruction while allowing full power capability when conditions permit.
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
The solution effectively reduces stray capacitance, prevents damage from high voltage, and maintains signal quality across a wide power range without distorting the input signal, ensuring efficient and reliable operation of RF tags.
Implementation Method 1
This type of stage generally includes an AC/DC converter converting a received alternating signal into a continuous power signal. An AC/DC converter of this type takes the form, for example, of a diode bridge of the Graetz type.
Implementation Method 2
the regulator circuit determining a second current value, said second current value being the current value provided in addition to the first current value
Data Source
AI summary
A receiver unit for a radio frequency (RF) tag is provided, including a first input terminal and a second input terminal each being connected to an antenna; a communication stage configured to demodulate and/or to modulate an incoming signal in the communication stage; and a power stage including a voltage converter circuit being configured to supply power to the receiver unit, and a regulation circuit being configured to limit an output voltage of the voltage converter circuit, wherein the regulation circuit includes a regulator circuit being configured to determine a first current value and a second current value, the second current value being a current value provided in addition to the first current value, and, if the second current value exceeds a predetermined threshold value, to supply a control signal to a limiter circuit configured to limit an input voltage of the voltage converter circuit.