Can thin film capacitors be used in automobile industry? Most of the cars on the market are aluminum electrolytic capacitors. With the increase of the number of new energy vehicles, electrolytic capacitors have been replaced, and the film capacitors are replaced.
Thin film capacitor is the main component of electric vehicle drive circuit, which plays a smoothing role. The inverter converts the DC power of the battery into a relatively small voltage through a converter, and then converts it into a rectangular wave similar to alternating current through IGBT switching elements. The surge voltage generated by this is very large and needs to be eliminated by using a smooth capacitor.
Aluminum electrolytic capacitor was used in the early smooth capacitor, but in order to improve the efficiency, the maximum voltage driven by motor was increased from 500V to 650V, and the withstand voltage of aluminum electrolytic capacitor was insufficient, and thin film capacitor became the mainstream.
In the future, the application of thin film capacitors in the field of new energy and new energy vehicles will be the main development direction. There are usually three places in the car where capacitors are used: energy storage, motor and electronic control.
In the design of the power supply part of new energy vehicles, it is necessary to use high voltage resistant capacitors for smoothing and filtering applications. The internal working environment of the automobile is usually bad, which requires the capacitors to have strong high temperature resistance, high reliability and long service life. Film capacitors have greater advantages than aluminum electrolytic capacitors.
From the perspective of industry attribute, different from other links in the new energy vehicle supply chain, there is no overcapacity and excessive competition in the new energy vehicle film capacitor industry.
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