High-frequency electronic transformers are developing in the high frequency direction

2018-12-27 16:08:23 JUKE CHINA ODM OEM Transformer factory Read

High-frequency electronic transformers are developing in the high frequency direction
High-frequency electronic transformers are developing in the high frequency direction

There are two main concepts in high-frequency electronic transformers. One is "electronics", which is different from power transformers and RF signal transformers. According to the field of switching power converters I am engaged in, "electronics" should be referred to as "power electronics" (Power Electronics). ), the second is "high frequency". Traditionally, above 20 kHz is high frequency, but at present, the understanding of high frequency in different fields may be different. For small power (tens to hundreds of watts) converters, a few hundred kHz is considered high frequency, and for high power (several hundred watts to several kilowatts), tens of hundreds of kHz is high frequency, and high power Frequency conversion tradition, tens of kHz is high frequency. However, high-frequency electronic transformers should refer to "power transformers used in switching power converter circuits with frequency ranges from tens of kHz to several mega kHz". The operating frequency range is different from power frequency and radio frequency. In the switching power converter, unlike the power transformer and the radio transformer, it transmits a certain amount of power, which is different from the signal processing transformer.

Simply put, the current high-frequency electronic transformers are moving in the high-frequency direction, that is, high power density and low plane. High power density is a requirement for market development, and high frequency is the most effective way to increase power density. With the continuous development of high-frequency magnetic materials, it has also created conditions for high-frequency transformers. At high frequencies, the key to improving the power density of the transformer is the design of the transformer. Because high frequency eddy current losses become important at high frequencies, traditional design methods have not met the requirements of high frequency, making the design of cores and windings more and more important. The requirements of low-profile transformers make PCB windings widely used, but low planes also bring new difficulties to transformer design, especially transformers with air gaps, such as flyback transformers, harmonic transformers, PFC inductors, etc. In short, electronic transformers are moving toward high frequency, low plane and new design techniques.

At present, high frequency electronic transformers are mainly used in the field of high frequency power conversion. In summary, electronic transformers are moving toward high frequency, planarization, integration, mode fastening, arraying and hybridization, and bring new analytical methods, such as electromagnetic field analysis methods and new design techniques, such as Optimized design, multi-field integrated integrated design, and new manufacturing processes challenge traditional processes. Because of the increase in frequency and the development of magnetic materials, many semiconductor process technologies can be applied to the manufacture of high-frequency transformers. In other words, transformers are not a discrete device, and they may have passed through thick film or thin film processes with power converters. Blended together. In the case of low power, this trend is already very obvious.