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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LED lighting market is developing rapidly, and LED driver is the core component of LED lamp. Its quality, performance and price have always been one of the main difficulties that plague LED lamp life and market popularity. With the continuous decline in the price of LED light sources, the importance of the drive is increasingly apparent. As one of the world's leading power suppliers, Mr. Hua Guichao has obtained many world-leading invention patents in the field of LED drivers. The Infinex, which leads the company, has quickly become one of the best LED driver manufacturers in China and the world. The technical strength of the drive is firmly in the forefront of the world.
Recently, Mr. Hua Guichao, Chairman of Infineon, accepted an interview with Gaogong LED to analyze the development status and technology development trend of the LED driver market in the industry.
In 2011, Infineon increased by more than 100%, and the overseas market developed rapidly.
In 2011, Infinet completed its stated goals at the beginning of the year and achieved a doubling of growth. Infineon’s overseas business has shown a positive upward trend in recent years. In 2011, overseas sales accounted for about 50%.
Hundreds of LED driver companies, high concentration of outdoor high-power drive market
Now in the LED driver industry, in terms of outdoor high-power drivers, the industry concentration is relatively high, the top 5 manufacturers occupy 50% of the market share; while in indoor lighting, the concentration is relatively low. The reason is that the outdoor high-power LED driver has high requirements on operating temperature, waterproof, lightning protection, input voltage fluctuation, load, and high maintenance cost, and the customer pays more attention to the reliability and service life of the driver. Relatively speaking, the requirements for indoor drives are relatively low, and the requirements for protection are relatively small, so the production enterprises are relatively scattered.
There are about a few hundred LED driver manufacturers in China, but there are only a handful of companies that really care about quality. The development of LED drivers is derived from the lessons and experience of customers. The accumulation of Infinity is not only technology, but also derived from the detours of many customers. For example, most domestic enterprises have a maximum rated voltage of 264V, while Infinity's product requirements are 305V. This is because there are 80-300 V fluctuation ranges in the face of China's actual voltage based on the rated voltage of 220V. . Ordinary products are prone to overvoltage failure due to the access of outdoor high-power equipment.
For more information, please refer to the March issue of "High-tech LED-Technology and Applications" magazine 
[Source "High-tech LED - Technology and Applications" March issue Zhang Yujie]
February 25, 2024