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How to Design an EMI Filter

Source:http://www.flowxgroup.com/Update Time:2014-05-13Hits:

EMI can be called as electromagnetic interference, which usually bombards electric actuators . An easy example of EMI is when someone inserts a household appliance, such as a vacuum cleaner, and upon turning it on, noise is gained by a radio receiver beside the appliance, which is very vital guide about how to design filter. Moreover, EMI filters can be used to filter EMI interference, and can be complex or simple, and a simple EMI filter includes a resistor, inductor and capacitor (RLC) circuit. What’s more below are the steps about calculating the R, L and C factors of an EMI filter, and then we can know how to design filter with electric actuators. If these components have been determined, the EMI filter can be built, installed and put into reality.

Firstly, we can choose a power converter that will work with the EMI filter. Moreover, we can see from the power converter specification, and then determine the operating input voltage range, output power, operating efficiency, switching frequency and conducted emissions limit. As we know, the first step is usually significant for us to learn how to design filter regulators .

Calculate the resistor (R) component in the RLC filter circuit. Square the input voltage of the power converter and multiply the results by the operating efficiency of the power converter. Divide the results by the output power of the converter. The results will be the R in the RLC circuit in ohms.

Secondly, as to the specific step about how to design filter, we should determine the peak amplitude of the harmonic content connected with the input current. Moreover, the procedure of how to design filter cannot exist without the pneumatic actuators . What’s more, we should double the input voltage of the power converter through applying efficiency of the power converter, and then divide the power converter output power by the result which is very important for how to design filter. Moreover, the influence will be the average current amplitude of the input pulse. Next, we can divide the average current by .50, or 50 percent, of which 50 percent is treated as the worst case task cycle of the input pulse. The influence is the worst case peak amplitude of any possible EMI interference signal, and by this step, we can come up with other ideas about how to design filter and then improve filter.

Finally, we should measure the required attenuation for the EMI filter. For attenuation, you need a proper range and frequency. In order to determine the attenuation range, we should divide the peak amplitude you determined in the previous step by the conducted emission specification value defined in the first procedure. Moreover, to determine the attenuation frequency or filter frequency, then we can research other information about how design filter, then knowing bout that we can take the square root of the attenuation amplitude and then divide the switching frequency worth you determined in the first step by the resulting number, which will give you great favor to get some helpful information about how to design filter, and we all know that knowing how to design filter we can not only improve our own imagination, but also can design many varies of filters ,and then make great devotion to the whole mankind.

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