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What are the differences and differences between filter inductors and energy storage inductors?
Sep 28, 2017



What are the differences and differences between filter inductors and energy storage inductors?


Inductors have many functions in the circuit, such as filtering, notching, frequency modulation, and energy storage. The energy storage inductor and the filter inductor are the classification of the inductance of the engineer according to the role of the inductor in the circuit. When the inductor is used for energy storage in the circuit, it is called the energy storage inductor. When it is used to remove the current interference, it is called Filter inductor.


Because the function of the inductor is different, the energy storage inductor is different from the filter inductor, and the electrical performance of the energy storage inductor and the filter inductor are different.


In general, their differences and differences are mainly reflected in:

1, the difference in function


The main function of the energy storage inductor is to use the mutual conversion between electromagnetic energy to temporarily store electrical energy. For example, in the case of a power disconnection, the energy storage inductor discharges the electrical energy to protect the circuit from the instantaneous high voltage shock caused by the sudden disconnection of the power supply.


The main function of the filter inductor is to use the high impedance of the inductor to the high frequency signal to block the high frequency signal or secondly the spike signal through the filter inductor.


2. Differences in electrical performance requirements, DCR requirements and inductance values are different


The energy storage inductor requires itself to have a very low DC resistance, which itself may allow a large current to pass, while the filter inductor mainly requires a large inductance value, which does not require much current.


3, inductance material difference


The energy storage inductor requires low DC resistance because the resistor consumes power at normal temperature, and as the power consumption increases, the inductor temperature rises, and the DC resistance is further increased. This runs counter to the purpose of the energy storage inductor. Therefore, energy storage It is preferable to use a superconducting material or a wire material having a small resistivity. Secondly, the energy storage inductor is generally made directly into an air-core coil. If the core is used, the magnetic loss is required to be as small as possible.


There is no such concern in the filter inductor. The general copper wire and ferrite or iron powder core materials can meet the performance requirements.


There are differences between energy storage inductors and filter inductors, but there is no specific standard for their definition. Because the inductor itself has both energy storage and filtering, whether the inductor is used for energy storage or filtering depends entirely on the environment in which the inductor is used. Therefore, some inductors are both energy storage inductors and filter inductors


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