Application Cases

Experiment Name: Application of Power Amplifiers in Power Line Carrier Communication and High-Voltage Monitoring

Research Direction: High-Voltage Monitoring, Power Line Carrier Communication, Convolutional Neural Network

Experimental Content:
Using a signal generator combined with a power amplifier to output high-voltage AC signals.

1. Achieve wireless illumination of the "LED inside a capacitor" device, and infer the voltage parameters (amplitude and frequency) of the high-voltage source by capturing the LED's luminescent characteristics.

2. Achieve wireless illumination of the "LED inside a capacitor" device and implement power line carrier communication by capturing the LED's luminescent waveforms.

Test Objective:
Propose the "LED inside a capacitor" device for power line carrier communication and high-voltage monitoring.

Test Equipment:
Signal generator, Aigtek ATA-2161 power amplifier, "LED inside a capacitor" device, oscilloscope, silicon avalanche photodetector, computer

Experimental Procedure:

1. Use a signal generator combined with a power amplifier to output a high-voltage AC signal with fixed frequency and amplitude, generating a corresponding electric field distribution around the wire.

2. Place the "LED inside a capacitor" device (with the structure: outer metal plate 1/inner metal plate 1-LED-inner metal plate 2/outer metal plate 2) below the wire, and wirelessly drive the LED to emit light via electromagnetic induction.

3. Use a silicon avalanche photodetector to capture the LED's brightness signal, convert it into a voltage signal, and display it in real-time on an oscilloscope. A computer processes the captured waveforms simultaneously to achieve high-voltage source parameter detection and power line carrier communication.

   
   

   
   

Test Results:
The proposed "LED inside a capacitor" device can convert high voltage on power lines into light pulses without requiring an external power source, enabling self-powered high-voltage detection. This method can sensitively extract high-voltage amplitudes, achieving a goodness-of-fit as high as 0.99967. Additionally, the light pulse waveforms generated by the device accurately reflect harmonic pollution on high-voltage lines, resulting in split output light pulses. A 1D-CNN was established to identify harmonic pollution on high-voltage lines with an accuracy of 94.53%. Moreover, due to the device's high sensitivity to the rate of potential change, it can accurately demodulate information carried on high-voltage lines, making it suitable for power line carrier communication.

Figure: Specifications of the ATA-2161 High-Voltage Amplifier