Power supply is an indispensable part of all electronic products. Power supply is divided into switching power supply, linear power supply and other types. Switching power supply has become the mainstream architecture of power supply in digital computing and network communication systems. The quality of the switching power supply is related to the overall performance of the product. Therefore, accurate analysis of the power supply is particularly important in R&D and production testing. The SDS2000 Super Phosphor Oscilloscope from SIGLENT is equipped with a powerful power analysis module that supports accurate test measurements for most power performance specifications. The power supply analysis function of the SDS2000 will be introduced in detail by analyzing the power board input module.
Take the power demo STBX as an example. The physical view is shown in Figure 1: 
Figure 1 STBX
The schematic diagram of the STBX circuit is shown in Figure 2: 
Figure 2 Schematic
Before proceeding, first check that the oscilloscope and power demo board are working well, and start power analysis after ensuring that the required items such as the oscilloscope, power demo board, and probe are no problem.
First, the SDS2304, differential probe, and current probe are used to measure the waveform of the power input terminal. The results are shown in the following figure (Figure 3). The red curve of channel 2 represents the voltage waveform, and the green curve of channel 4 represents the current waveform. With the powerful parameter measurement function of SDS2000, we can easily obtain the peak-to-peak value, effective value, maximum value and minimum value of current and voltage. The measurement items in the figure are the peak-to-peak value and frequency of current and voltage.
Figure 3 Input primary signal
Since each particular voltage and current probe has a different transmission delay, the timing delay error between the voltage and current probes can have a significant impact on the power measurement. Therefore, in order to perform accurate power measurements and calculations, we must use the "delay deviation correction" procedure to balance the delay between the voltage and current probes in actual operation. This step is very important to ensure accurate measurements by performing probe delay offset correction before measuring power.
Figure 4 Power Analysis Item
As shown in the figure above (Figure 4), the SDS2000 is equipped with a powerful power analysis module that can select power quality, current harmonics, inrush current, switching loss, conversion speed, modulation, output ripple, transient response, etc. in the power analysis. Different analytical methods. This allows engineers to have more flexible options and greater operational space in real-world applications. This article will focus on power quality analysis, current harmonic analysis, and inrush current analysis.
Power quality analysis measures important indicators of power quality such as power, phase angle, and more. Part of the AC current can flow into or out of the load without providing energy. This type of current is called reactive current or harmonic current and can produce "apparent" power above actual power consumption. The power quality is measured by the following measurements: power factor, effective power, apparent power, reactive power, crest factor, phase angle of the current, and voltage of the AC line, as shown in the following figure (Figure 5).
Figure 5 can analyze parameters
The measurement parameters display interface is as follows:
Figure 6 Power factor
Figure 7 Measurement items
Figure 8 phase angle
As can be seen in Figure 6, Figure 7, and Figure 8, the SDS2000 uses the MATH calculation function, combined with the powerful measurement and statistics function, to easily obtain the many information we need, and can measure the current value, average value, and minimum of the measurement item. The value, maximum value, and standard deviation are displayed accurately at the same time. Providing a more efficient and convenient experience for engineers.
Then we need to analyze the current harmonics, select the current harmonics, set the signal frequency type to 50Hz, and the standard selection is Class A. As follows:
Figure 9 Selecting Current Harmonic Analysis
Figure 10 sets the signal frequency and current harmonic standard type
When we choose the current harmonic standard, we must first understand the difference between the standards.
Class Class A: Suitable for balancing three-phase equipment, household appliances (except for Class D equipment), tools (except portable tools), incandescent dimmers and audio equipment;
Class B: For portable tools;
Class C: For lighting equipment, when you press the "Apply" softkey (in the "Power Application" main menu), the C class requires a power factor calculation, so when the "Power Application" is disabled, only the C class can be selected. , this will force you to press Apply again to perform the analysis;
Class D: For equipment rated at less than or equal to 600 W, the types are as follows: personal computer and personal computer monitors, TV receivers.
After the setting is completed, open the FFT operation function in MATH, select the Hanning window type, select the table display in the display, press the “Apply†button, and after the analysis is completed, the result of the current harmonic analysis can be obtained as shown below (Figure 11):
Figure 11 Current Harmonic Analysis
It can be seen that the current table shows the 8th harmonic, the harmonic frequency is 50Hz~400Hz, and the current RMS (RMS), limit (RMS), margin (Margin) and pass/fail status can be observed. In the figure, the corresponding frequency of the corresponding frequencies of 100Hz, 200Hz, 300Hz is <80%, the statistics are Fail, and the rest is Pass (Note: the residual calculation method is {(limit-actual value)/limit} *100%). In practical applications, more observable harmonics will lead to more accurate power supply parameter analysis.
The SDS2000 inrush current analysis measures the power inrush current and records the current waveform. The peak current can be positive or negative, so the result is the larger of the measured maximum or minimum.
The measurement results are as follows (Figure 12):
Figure 12 Inrush current measurement
As the first super-fluorescent oscilloscope with original SPO technology, SDS2000 is equipped with powerful power analysis module with high processing speed and powerful measurement and statistics function. It is a sword in power analysis and adds multiple measurements. The indicators simplify the operation and optimize the interface, making it easier and more efficient for engineers to use.
As a general-purpose instrument manufacturer specializing in R&D, production, sales and service, SIGLENT has always focused on R&D and manufacturing of the latest test and measurement instruments, insisting on R&D as the core competitiveness, through continuous technological innovation and strict Quality control, step by step deepening brand building, we have reason to believe that in the future SIGLENT will continue to bring more and better and more practical products.
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