Abstract : Currently, many devices we use daily that have or utilize frequency converter drive systems generate a large amount of high-order harmonics. This serious electromagnetic radiation is an invisible killer, detrimental to both our health and the use of precision instruments, with far-reaching and serious consequences. Keywords: Electromagnetic radiation; Electromagnetic interference. Frequency converters are power converters in motion control systems. Current motion control systems encompass multiple technical fields, with the general development trend being AC-based drives, high-frequency power converters, and digital, intelligent, and networked control. Therefore, frequency converters, as crucial power conversion components, have experienced rapid development due to their ability to provide controllable, high-performance variable-voltage and variable-frequency AC power. The rapid development of frequency converters benefits from advancements in power electronics, computer technology, automatic control technology, and motor control theory. The development level of frequency converters is determined by two aspects: power electronics technology, motor control methods, and the level of automation control. Current competition focuses on the research, development, and production of high-voltage frequency converters. With the application of new power electronic devices and high-performance microprocessors, as well as the development of control technology, the performance-price ratio of frequency converters is getting higher and higher, and their size is getting smaller and smaller. Manufacturers are also continuously improving reliability, making new efforts to further miniaturize, lighten, increase the performance of frequency converters, enhance their multi-functionality, and reduce pollution. To judge the performance of a frequency converter, one must consider: first, the impact of harmonics in its output AC voltage on the motor; second, its harmonic pollution to the power grid and input power factor; and finally, its energy loss (i.e., efficiency). Here, we will take the widely used AC-DC-AC frequency converter as an example to illustrate its development trend: self-turn-off, modularization, integration, and intelligence of the main circuit power switching elements; continuously increasing switching frequency and further reducing switching losses. [b][align=center]For more details, please click: Discussion and Analysis of Frequency Converter Development Trends[/align][/b]