Electrolytic capacitor
The electrolyte material inside the electrolytic capacitor, which has charge storage, is divided into positive and negative polarity, similar to the battery, and cannot be connected backwards.A metal substrate having an oxide film attached to a positive electrode and a negative electrode connected to an electrolyte (solid and non-solid) through a metal plate.
Nonpolar (dual polarity) electrolytic capacitor adopts double oxide film structure, similar to the two polar electrolytic capacitor after two connected to the cathode, the two electrodes of two metal plates respectively (both with oxide film), two groups of oxide film as the electrolyte in the middle.Polar electrolytic capacitors usually play the role of power filter, decoupling (like u), signal coupling, time constant setting and dc isolation in power circuit, medium frequency and low frequency circuit.Non-polar electrolytic capacitors are usually used in audio frequency divider circuit, television S correction circuit and starting circuit of single-phase motor.
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At present, in LED low-power lighting applications, a more obvious trend in the market is that low-power LED lamps are beginning to adopt more and more non-isolated power supply topologies. Currently, the popular high-voltage linear constant current drive is a non-isolated topology. A type of structure. 
Li Zhaohua, deputy general manager of Mingwei Electronics
At the same time, the high-voltage linear constant current driving power supply chip can work under 650V high voltage, and its application circuit is Buck circuit. There are no transformers, inductors and electrolytic capacitors in its working circuit. It can be attached to the same side of the lamp board together with the LED lamp bead and the rectifier bridge stack. It is suitable for large-volume, automated production and can occupy the market faster.
Line performance can't be the mainstream of the future, I think there is a big chance. Some people ask whether the linear drive can be smart, can not do high power, I think it can. Mingwei Electronics' linear integrated drive technology has been tested in many application companies and achieved good results. At the same time, it has achieved good results in intelligent driving. 
"At present, there are several types of switching power supplies, linear power supplies, and intelligent control power supplies on the market. It is no stranger to switching power supplies, but can we maximize their performance? Can we make the structure simple? Can't solve practical problems for customers? It's hard to say.