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Abstract
In today's world, power supply systems are becoming more and more important and indispensable. Power supplies can be used in various fields like industrial, medical, electronics, and others. Therefore, to ensure the quality and reliability of these power supplies, a testing system is necessary. The purpose of this paper is to present a LabVIEW-based testing system that can accurately test and verify the efficacy and safety of the power supply. The system is designed to test the performance of a two-stage power supply.
Introduction
Power supplies are necessary for various fields such as:
• Industrial Applications
• Telecommunication Systems
• Consumer Electronics
• Computers
• Medical Equipment
• Aerospace
A power supply is a system that converts an AC input voltage to a regulated DC output voltage. To ensure the desired output voltage, a power supply needs to be tested for its efficiency, accuracy, and safety. The system should be built to test a power supply according to specific standards and regulatory requirements. This paper presents a LabVIEW-based testing system that is designed to test a two-stage power supply.
LabVIEW-Based Testing System
The power supply testing system is designed using LabVIEW software. LabVIEW is a graphical programming environment used in data acquisition, instrument control, and industrial automation. The system performs several functions to validate the performance and reliability of the power supply. The system works by taking input voltage from the power supply to test and produces the output values and waveforms for analysis.
Hardware Architecture
The LabVIEW-based testing system is composed of several hardware components. The hardware configuration includes:
• A Two-Stage Power Supply
• A Digital Storage Oscilloscope
• A Programmable DC Load
• A Function Generator
• Cirrus Logic Audio Analyzer
• A Computer or Laptop
The Two-Stage Power Supply
The power supply to be tested is a two-stage power supply consisting of a transformer, rectifier, and filter circuit. This power supply transforms the AC input power to DC voltage, filters and regulates it to a constant value. The power supply output is connected to the digital storage oscilloscope. The power supply should be able to produce a stable, constant output voltage without any ripples or noise.
The Digital Storage Oscilloscope
The digital storage oscilloscope is used to capture and store the waveforms of the power supply output voltage. It provides an accurate measurement of the voltage, frequency, and phase of the signal. The DSO is connected to the power supply output to measure the significant AC and DC components of the signal. The LabVIEW software receives the data from the DSO through a GPIB interface.
The Programmable DC Load
The programmable DC load is used to load the power supply under test. The DC Load provides a resistance load for the power supply output and measures the supplied current. The Load is controlled by the LabVIEW software through a GPIB interface.
The Function Generator
The function generator is used to supply a test signal to the power supply under test. The frequency, amplitude, and waveform of the signal can be programmed to simulate different conditions. The function generator is connected to the power supply input.
Cirrus Logic Audio Analyzer
The Cirrus Logic Audio Analyzer measures the output noise, distortion, and other audio characteristics of the power supply. The analyzer is connected to the power supply output through a GPIB interface.
Computer/Laptop
The Computer/Laptop is used to control and monitor the LabVIEW program. The computer sends commands to the instruments, receives data, and displays the results. The computer/Laptop is connected to the hardware through a GPIB, USB, or Ethernet interface.
Software Architecture
The LabVIEW-based testing system is programmed using LabVIEW software. The software includes several blocks that perform specific functions. The LabVIEW program is composed of:
• Communication Block
• Voltage Regulation Block
• Load Regulation Block
• Ripple Block
• Transient Block
• Efficiency Block
All the blocks are triggered by a master control panel or dashboard.
Communication Block
The communication block is responsible for controlling the GPIB interface between the computer and the instruments. The communication block sends commands to the instruments and receives data from them. The block is triggered by the master control panel.
Voltage Regulation Block
The voltage regulation block tests the accuracy and stability of the power supply output voltage. The block takes the output waveform from the oscilloscope and performs various analyses to determine the amplitude, frequency, and phase of the signal.
Load Regulation Block
The load regulation block tests the ability of the power supply to maintain a stable output voltage while subjected to real load conditions. The load regulation block applies different loads to the power supply output using the programmable DC load and measures the supplied current. The data is analyzed to determine the linearity of the power supply.
Ripple Block
The ripple block is used to measure the amount of ripple or noise present in the power supply output. The ripple is measured by the digital storage oscilloscope. The data is analyzed to determine the ripple frequency and amplitude. The ripple block also measures the Power Spectrum Density (PSD) of the output signal, which is used to determine the noise and frequency components.
Transient Block
The transient block is used to test the ability of the power supply to respond to fast-changing loads. The transient block applies a rapid change in the output load while monitoring the output voltage. The data is analyzed to determine the dynamic response of the power supply.
Efficiency Block
The efficiency block is used to calculate the efficiency of the power supply. The efficiency is calculated by dividing the output power by the input power percentage. The efficiency block uses data from the load regulation block, voltage regulation block, and transient block.
Conclusion
In conclusion, this paper presents a LabVIEW-based testing system that is designed to test and validate the performance and reliability of a two-stage power supply. The system is composed of several hardware and software components. The system provides accurate and reliable measurement of the power supply output voltage, current, efficiency, and other characteristics. The system is useful for manufacturers of power supplies to validate the quality and safety of their products. The system can also be used by regulatory agencies to test the compliance of power supplies to safety standards and regulations.