In modern power supply technology, especially in the design of linear power supplies and switching power supplies, aluminum electrolytic capacitors have always been an indispensable key component. However, the aluminum electrolytic capacitors used in this conventional AC-DC power supply design have many shortcomings, such as poor reliability and short life under extreme high and low temperature conditions. This has created a need to find alternative devices that can replace traditional aluminum electrolytic capacitors and improve power supply reliability and longevity.
The main problem with aluminum electrolytic capacitors is their design flaws. In AC-DC power converters, aluminum electrolytic capacitors are widely used in rectification and filtering due to their advantages such as large capacity and low cost. However, the electrolyte is prone to leakage or drying up under extreme conditions of high and low temperatures, causing capacitor characteristics to change or even fail. Failed aluminum electrolytic capacitors will release flammable and corrosive gases, causing the AC-DC module power supply to fail. Although electrolytic capacitors have their irreplaceable advantages, their shortcomings such as large internal losses, large leakage current, and poor high and low temperature characteristics make them have obvious disadvantages in terms of reliability and service life.
Compared with this, ceramic capacitors have shown significant advantages in many aspects. Ceramic capacitors have extremely low equivalent series resistance (ESR) and equivalent series inductance (ESL), which reduces the risk of damage due to parasitic parameters. More importantly, the electrolyte of ceramic capacitors is not easy to volatilize or solidify under high and low temperature extreme conditions. Its capacity is more stable and it can maintain good electrical characteristics for a long time, thus significantly improving the high and low temperature performance and long-term reliability of power supply products. Power products using ceramic capacitors have advantages in efficiency, environmental protection, lifespan, high and low temperature characteristics and high EMC characteristics.
Therefore, by using high-voltage ceramic capacitors to replace and optimize the basic functions of electrolytic capacitors in switching power supply design, it can not only effectively solve the problems caused by the inherent defects of electrolytic capacitors, but also improve the overall performance and reliability of the power module. This improvement is critical to improving the long-term stability and service life of the power module.