No electrolytic capacitor solutions help to improve the stability of the inverter

Since the first fault current of the inverter average time is about 5 years, so the PV inverter PV system to become the main cause of many failures. Designed to enhance the reliability of the inverter, consider the following factors and take appropriate measures, including: low-loss power devices and switching circuits, updated packaging technology, an alternative to electrolytic capacitors, over the design, as well as common device redundancy reasons, such as failure modes and in-depth analysis.

Other challenges photovoltaic inverter reliability design include: electrolytic capacitor with low reliability and reasonable prices to find different types of high-voltage, large-capacity capacitor technical difficulty; lack of a structured approach to product planning and manufacturing quality control immature Technology will also damage the reliability; addition, work in harsh environments (very low or very high temperatures, moisture and sunlight) also brought challenges to the reliability of the design.

Electrolytic capacitor aspects of the problem, Infineon's senior JeromeLee proposal by reducing the electrolytic capacitorripple current to prolong the life of the inverter. When the high-frequency operation and high efficiency target switch conflict, need to consider the capacitor bank is too big or appear multiphase systems. In addition to the problem of aging electrolytic capacitors, voltage ratings decline, and he thinks the cooling effect is also a major factor affecting the reliability of PV inverters, most cost-performance optimization is to use the 600V power level of the device. At this point can be used as the input stage to reduce the voltage stress to 500V overvoltage protection system or by using the following step-down converter.

According to the reporter, Infineon has completed the PV micro-inverters without electrolytic capacitor solutions, and in 2013 September 16 to September 27 in the country five cities (Wuhan, Nanjing, Beijing, Chongqing, Xi'an) Roving Seminar on the Power Management to be released, then, a team of experts will explain in detail Infineon efficient products in the switching power supply, lighting drivers, development and application of long-life photovoltaic inverter with charger  high reliability motor drive and other areas . In addition, Infineon will launch the latest CoolMOSTM series, the fifth generation of SiC Schottky diodes, and other new generation of low voltage OptiMOSTM promote creative design applications was easy. It is understood that since Infineon Technologies power management products into China, its high performance, reliable quality, diverse solutions to get the trust of many customers.

Currently, Infineon Technologies power management product applications, involving switching power supply, V-core power, lighting, photovoltaic inverters, electric vehicles, energy storage, motor drives. Its family of products is huge, not only power devices (such as CoolMOS, OptiMOS, SiCDiode, SiCJFET, etc.), power control IC (eg PFCIC, LLCIC, QRFlyback, CoolSET, etc.), but also covers the lighting control IC (fluorescent lamp ballast controller ICB2FL series, LED ICL8002G drive controller, etc.) and digital control IC.