PWM Signal Generation for Near-Field Communication Noise Reduction
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Solution Overview
Problem
Existing systems using near-field communication for controlling equipment face challenges in efficiently converting control or configuration data into interpretable signals, particularly due to noise interference from pulse width modulation (PWM) signals, which can disrupt radio frequency communications.
Innovation Solution
A method and circuit that modify PWM pulse trains during near-field communication by reducing specific parameter values, then resume the original settings after communication, integrated with an NFC interface and PWM signal generation circuit to minimize noise and ensure accurate data interpretation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If PWM signals are generated with high power and frequency for effective equipment control, then control effectiveness is improved, but noise interference during RFID communication increases
Solution Approach 1:
The PWM generation circuit dynamically adjusts its operating parameters based on the communication state. During RFID communication, the circuit automatically reduces PWM power and frequency to minimize noise interference. When communication is not active, the circuit resumes normal high-power PWM generation for effective equipment control. This dynamic adaptation resolves the contradiction between maintaining effective control and reducing noise interference.
Solution Approach 2:
The invention changes the parameters of the PWM signal (power level and frequency) depending on the operational context. By reducing power and frequency during RFID communication and maintaining high power during normal operation, the system optimizes both communication reliability and control effectiveness without permanent compromise to either function.
2Measurement precision
If PWM signal frequency is increased for better control resolution, then control precision is improved, but noise interference during communication increases
Solution Approach 1:
The PWM generation circuit dynamically adjusts its frequency based on the communication state. During RFID communication, the circuit automatically reduces PWM frequency to minimize noise interference and improve communication reliability. When communication is not active, the circuit resumes normal high-frequency PWM generation for precise equipment control. This dynamic frequency adjustment resolves the contradiction between maintaining control precision and reducing noise interference.
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 effectively reduces noise interference during near-field communication, allowing for reliable conversion and interpretation of control data without the need for complex microcontroller programming, thus enhancing the efficiency and cost-effectiveness of equipment control systems.
Implementation Method 1
an electromagnetic field emitted by a device (terminal or reader) to communicate with another device (card or tag)
Implementation Method 2
near-field communication (NFC) technologies
Implementation Method 3
an NFC device comprises a resonant circuit formed of one or a plurality of antennas (inductive elements) and of one or a plurality of capacitive elements for detecting an electromagnetic field. The voltage recovered across the resonant circuit
Implementation Method 4
generating a PWM pulse train using a first set of parameter values and modifying the PWM pulse train during a near-field communication
Data Source
AI summary
A method of reducing noise generated by pulse width modulation (PWM) signals includes generating a PWM pulse train using a first set of parameter values and modifying the PWM pulse train during a near-field communication so that the PWM pulse train is generated using a second set of parameter values. Modifying the PWM pulse train includes reducing at least one parameter value of the first set of parameter values. The method further includes resuming generation of the PWM pulse train using the first set of parameter values after the near-field communication.