source:power adapter Popular:adapter release time:2021-10-23 09:20:53 Article author:sznbone
The switching power supply adapter is susceptible to the influence of the surrounding electromagnetic environment during the working process, causing problems such as unstable performance, so how to adjust the voltage noise of the switching power supply adapter? The following power adapter manufacturers explain in detail for everyone.
The first method that can effectively improve the output voltage noise of a switching power supply adapter is that engineers can use a combination of chip three-terminal capacitors and ordinary electrolytic capacitors at the output of the adapter to improve the high-frequency characteristics of the filter. Before introducing the specific operation mode of this method, we need to first understand why the adapter has a noise voltage peak. Without adding any measures, the output end of the adapter usually contains a large noise voltage peak, which is caused by the imperfect characteristics of the electrolytic capacitor at high frequencies. Because electrolytic capacitors can be equivalent to the series connection of capacitors, resistors, and inductors at high frequencies, the bypass effect of capacitors on noise is not obvious at high frequencies. Due to the existence of resistance and inductance, the noise voltage is reflected on the output end of the switching power adapter.
After understanding the cause of the peak output noise, in order to better suppress the output noise of the switching power adapter, there are usually two methods that can be used by product developers. The first method is to split the electrolytic capacitors at the output end into several, that is, a large-capacity electrolytic capacitor is replaced by several small-capacity electrolytic capacitors in parallel. Although this proposal cannot fundamentally suppress the generation of noise voltage, the peak-to-peak value of the signal noise voltage generated by the new method is smaller than the original one. The second method is to connect a small-capacity high-frequency ceramic capacitor in parallel next to the electrolytic capacitor, and use the low capacitive reactance of the high-frequency capacitor at high frequencies to greatly attenuate the output noise voltage. Of course, the ceramic on the printed circuit board The capacitor should also keep the wiring length relatively short and keep the line impedance as small as possible.
The second method that can effectively improve the output voltage noise of the switching power supply adapter is that engineers can use high-performance surface mount filters to improve the noise peak situation. The internal circuit of the mounting filter can be equivalent to a π-type filter circuit. A high-performance filter is mounted on the output end of the switching power adapter. Compared with the original output noise voltage peak value, the noise will be greatly reduced. In the experiment, the noise The voltage peak is almost displayed as a straight line on the oscilloscope, which shows that the noise of the output voltage has been obviously suppressed, which well illustrates the role of surface mount high-performance filters in this circuit.
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