Application of oscilloscope in switching power supply
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.
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