Programmable AC Power Applications – Electronic Equipment Start-Up Inrush Current Testing

In daily life, we often see that when the plugs of Electronic devices such as mobile phone chargers and computer power supplies are inserted into the socket, electric sparks appear inside the socket, and even a “pop” can be heard. The main reason for the above phenomenon is that the starting surge current of electronic equipment is too large. Larger startup surge currents can easily damage the components of electronic equipment (such as rectifier bridges, relays), and may also interfere with the normal operation of surrounding electronic equipment, and even cause grid lines to trip and power off.Effectively controlling the start-up surge current of electronic equipment is not only conducive to improving the service life of electronic equipment, but also reducing the interference effect on surrounding electronic equipment, measuring and improving electronic equipment

In daily life, we often see that when the plugs of electronic devices such as mobile phone chargers and computer power supplies are inserted into the socket, electric sparks appear inside the socket, and even a “pop” can be heard. The main reason for the above phenomenon is that the starting surge current of electronic equipment is too large. Larger startup surge currents can easily damage the components of electronic equipment (such as rectifier bridges, relays), and may also interfere with the normal operation of surrounding electronic equipment, and even cause grid lines to trip and power off. Effectively controlling the starting surge current of electronic equipment is not only beneficial to improve the service life of electronic equipment, but also can reduce the interference effect on surrounding electronic equipment. Measuring and improving the maximum starting surge current of electronic equipment is indispensable in the process of electronic equipment development and verification. section.

The grid condition for measuring the maximum starting inrush current of electronic equipment is usually the peak value of the nominal AC input voltage maximum. For example, the AC input of electronic equipment is 100-240V (RMS), and the peak voltage of the maximum input voltage of 240V (rms.) is 340V (peak). That is to say, during the experiment, an AC power supply that can change the voltage and phase is needed as the grid input source of the object to be tested (electronic equipment). Zhiyuan Electronics PWR series programmable AC power supply is a multi-functional AC power supply device that can provide normal or abnormal grid input, and can easily simulate the above grid conditions. Taking the programmable AC power supply PWR2000W as an example, after connecting the test equipment, set V=240V, phase=90° or 270° on the programmable AC power supply PWR2000W interface (as shown in Figure 1), and set the voltage rising slope to the maximum value. After completing the setting, press the “On/Off” button, the normal output of the programmable AC power supply PWR2000W meets the above requirements (as shown in Figure 2 and Figure 3 below), and the voltage waveform is stable and clean without clutter, reducing the start-up surge for measurement Additional disturbances are generated during the current flow.

Programmable AC Power Applications – Electronic Equipment Start-Up Inrush Current Testing

Figure 1 AC Power Interface

Figure 2 U=240V (rms), phase=90°

Figure 3 U=240V (rms), phase=270°

The PWR2000W programmable AC power supply (Fig. 4-1/4-2) has the following features in addition to the voltage and phase adjustment functions:

• Output AC range: 0~150/0~300Vrms;

• Output mode: AC, DC, AC+DC;

• Adopt advanced PWM modulation technology, high power density and high efficiency;

• Built-in simulation functions such as List, Step and Pulse (circuit simulation) to realize voltage disturbance test;

• Built-in harmonic synthesis simulation function, which can synthesize the 50th harmonic to accurately simulate the distorted power grid;

• Grid fluctuation test (professional version) in line with IEC61000-4-11/13/14/28/29 and other standards;

• Adjustable on/off phase angle, voltage change rate;

• Built-in high-precision power meter to measure electrical parameters such as voltage and current in real time;

• Powerful harmonic analysis function, which can test voltage harmonics and current harmonics up to the 99th order;

• Built-in multiple types of waveform data, which can be called quickly;

• USB interface supports file import and export, including CSV waveform import and test data saving;

• Support multi-machine parallel output, up to 3 units, to form high-power single-phase or three-phase power supply;

• Standard communication interfaces such as RS-232/USB/Ethernet/GPIB;

The Links:   SKIIP26AC126V1 FP35R12W2T4_B11