Other Applications for AC Power
Taking automotive electronic testing as an example, it is necessary to use a DC power supply (such as GW Instek PSW and PSU series) to perform tests such as Overvoltage, Slow decrease and increase, discontinuous, etc. When corresponding to relatively complex test items such as Reverse Voltage, Ground reference off-set , Superimposed alternating voltage or special waveforms (Load Dump pulse 5a, 5b, Voltage Drop pulse 4) etc., it is required to precisely control arbitrary waveforms by using AC/DC power supply.
Arbitrary Wave Application of AC Power Supply: ISO16750-2/2003 Vehicle Motor Electronic Environmental Test/Power Load Test Standards
- SEQ6 (4.5.1): Momentary drop in supply voltage: Simulate the effects of fuse failure in other circuits
- SEQ7 (4.5.2): Reset behavior at voltage drop: Demonstrate the effect of the device's reset behavior on the product at different pressure drops
- SEQ8(4.5.3): Starting profile Evaluate the effect of different voltage changes on the product
- SEQ9: Load dump without centralized load dump suppression
Figure 13 : An example of the built-in arbitrary waveform of GW Instek ASR series AC power supply
AC power measurement function
For high-accuracy power analysis, a power meter or power analyzer is required. But for production line tests that require less accuracy, the AC power measurement function is an economical choice for multiple purposes.
- Basic measurement includes: AC and DC output voltage, current and power
- Common measurements (Useful) include: output voltage and current true root mean square (true RMS), peak value and average value (DC)
- Advanced measurement includes: apparent power (VA), reactive power (VAR), power factor (PF), crest factor (CF) and peak hold current)
Figure 14 : Example of measurement results of AC source
In addition to the above measurements, GW Instek ASR-2000/3000 series also has builtin voltage and current harmonic analysis functions.
Figure 15 : Example of measurement results of AC source
Current Crest Factor CF (Crest Factor) of AC Power Supply
The power supply serves the load, the higher the current crest factor, the stronger the ability to support the load.
Figure 16 : Waveform example of current crest factor
Under the same rated power, the higher-order AC source current crest factor is larger, the current crest factor CF of GW Instek ASD-1300, 1600, 1900 is 3, and the current crest factor CF of ASD-1150 and ASR-2000 series is 4. , ASR-3000 series current crest factor CF is 6.
Conclusion
Mencius once used three sentences to describe a man of character: Neither riches nor honors can corrupt him; neither poverty nor humbleness can make him swerve from principle; and neither threats nor forces can subdue him. We can make an analogy. A good power supply has the same characteristics as the man described by Mencius.
Neither riches nor honors can corrupt him and neither poverty nor humbleness can make him swerve from principle are just like the line voltage regulation rate of the power supply, we expect that no matter how the quality of the input power changes, it will not affecting the output of the power supply. Neither threats nor forces can subdue him is just like the load regulation rate. We expect that the change of the load will not affect the output of the power supply.
This Paper covers the characteristics of the input end of the test power supply. We will discuss the application of electronic loads in a special article in the near future.
GW INSTEK AC Power Family
Note: The ASD-1000 series: Only available in Southeast Asia, Taiwan and Korea
| APS-7000 series | ASD-1000 series | ASR-2000 series | ASR-3000 series |
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Output capacity: APS-7100 (1000VA) APS-7200 (2000VA) APS-7300 (3000VA) Options 600Vrms/1000Vrms/45~10 00Hz Models (480Vrms applications are available in North America) New energy grid-connected application (APS-7000 can withstand reverse current conditionally) |
Output capacity: ASD-1300 ASD-1600 ASD-1900 30~1000.0Hz (AC Mode) |
Output capacity: ASR-2100 (1000VA) 175/350Vrms、10/5 Arms) 40~999.9Hz (AC Mode) 1.0~999.9Hz (AC+DC Mode) |
Output capacity: ASR-3300 (3000VA) ASR-3400 (4000VA) |
| Support low current measurement 2mA ~ 35A, minimum resolution 0.01mA (APS-7050& APS7100) |
CF=3 for other models except ASD1150 |
With DC mode (editable fast arbitrary waveform), CF=4 | With DC mode (editable fast arbitrary waveform), CF=6 |
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APS-7000E economic model is available
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Blue indicates the special functions of each model, and other models of the same series do not have the functions
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Note: Due to the great difference in the environment of each customer's input terminal wiring, the standard accessories of the ASR-3000 series do not include the input terminal power cord and load line |
References：
- ITI (CBEMA) CURVE APPLICATION NOTE http://www.itic.org/resources/Oct2000Curve-UPDATED.doc
- Taiwan Electric Research & Testing Center（TERTEC）online seminar speech on July 27, 2022, an invitation by GW Instek.
- Master's Thesis, Department of Electrical Engineering, National Sun Yat-Sen University: Analysis of Sensitive Equipment Affected by Voltage Sag, written by Chen Zhiqiang, July 1994
Figure 17 : Original graph in ITI (CBEMA) CURVE APPLICATION NOTE document