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How to effectively inhibit the switching power adapter output voltage noise?

Issuing time:2015-07-16
SHENZHEN Branch Power Technology Co., Ltd.-How to effectively inhibit the switching power adapter output voltage noise?

Switching power adapter in the course of work, it is easy because of poor or low immunity electromagnetic compatibility performance affected by the surrounding electromagnetic environment, and the case output voltage noise appears in the operation, which can cause instability adapter performance issues . In order to effectively suppress the output voltage noise, engineers should take what measures can in the shortest time noise voltage decay deal with it? This article describes two methods will help engineers to quickly grasp the output voltage noise suppression method.

     First, we can from the high frequency characteristics of the output terminal in a bid to enhance and improve the high frequency characteristics of the adapter, in order to fundamentally achieve the output voltage noise suppression effect. Engineers can choose to use the output of the switching power supply adapter chip three-terminal capacitors and general electrolytic capacitor combination, in order to improve the high frequency characteristics of filtering. Often the output of the switching power supply adapter containing a large peak noise voltage case, since the electrolytic capacitors are at high frequencies caused by imperfections in the properties.

     In improving the output of the high-frequency characteristics, based on the engineer can select the output of electrolytic capacitors split in several, will a large-capacity electrolytic capacitor using several small-capacity electrolytic capacitors in parallel instead. Although this proposal is not simply suppress noise voltage generation, but with a new approach to noise voltage generated letter peak - than the original small. In addition, the engineer can choose the electrolytic capacitor in parallel next to a small volume of high-frequency ceramic capacitors, high-frequency capacitance at high frequencies reflected low capacitance, the output noise voltage is greatly attenuated.

     Next we look at the second output voltage noise suppression method that engineers can choose to use high-performance surface mount filter for noise suppression. Mount filter internal circuitry can be modeled as a π-type filter circuit on the output of the switching power adapter series a high-performance filter mount. After the installation is complete, engineers can use the oscilloscope peak test, usually peak at this time can be displayed as a line almost on an oscilloscope, the noise of the output voltage is significantly suppressed, which also can prove mount filter for output When dealing with very effective voltage noise of


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