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Home » News » industry information » Analysis and practice of replacing Aluminum Electrolytic Capacitor with thin Film Capacitor(I)

Analysis and practice of replacing Aluminum Electrolytic Capacitor with thin Film Capacitor(I)

Views:0     Author:Site Editor     Publish Time: 2018-03-14      Origin:Site

1 preamble

 

      Aluminum electrolytic capacitor is the most critical component which restricts the life of inverter "target=" blank > inverter, and its main reason is the life of aluminum electrolytic capacitor, especially in the application of high harmonic current and high temperature. Compared with other components, the life of aluminum capacitor capacitor is the shortest.

 

The function of "DC support" and "DC-Link" Capacitor

 

     When DC is used as the power supply for inverter, this power supply is also called "DC-Link" because it needs to be connected with the inverter by DC bus. Because the inverter needs to ask for high effective value and high amplitude pulsating current from "DC-Link", it will produce very high pulsating voltage on "DC-Link", which makes it difficult for the inverter to bear. To do this, "DC-Link" needs to be "supported" to ensure the quality of "DC-Link" power supply.

      In most cases, the components that support the "DC-Link" are capacitors. The function of "DC-Link" capacitor is to absorb the high amplitude pulsating current from the inverter from "DC-Link", to prevent it from producing high amplitude pulsating voltage on the impedance of "DC-Link", so that the voltage fluctuation of the inverter can be kept in the allowable range.

     The second function of the "DC-Link" capacitor is to prevent the effect of voltage overshoot and transient overvoltage from "DC-Link" on the inverter.


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