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Multilevel inverter-based dual-frequency power supply

机译：基于多电平逆变器的双频电源

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摘要

Most existing power supplies for induction heating equipment produce voltage at a single (adjustable) frequency. Recently, however, induction heating power supplies that produce voltage at two (adjustable) frequencies simultaneously have been introduced and commercialized. These represent a significant development particularly for heat-treating workpieces with uneven geometries, such as gears. Still, the existing approaches to dual-frequency voltage generation could be improved upon to achieve better control, higher efficiency, and reduced electromagnetic interference. This letter proposes the use of multilevel inverters for providing power at two frequencies simultaneously. It describes how the stepping angles for the desired output from such inverters can be determined. Furthermore, experimental results are presented as verification of the concept and to demonstrate the achievement of improved harmonic level control and reduced device switching frequency.
机译：现有的用于感应加热设备的大多数电源都会以单个（可调）频率产生电压。然而，近来，已经引入了感应加热电源，该感应加热电源同时产生两个（可调）频率的电压，并且已经商业化。这些代表着重大的发展，特别是对几何形状不均匀的工件（例如齿轮）进行热处理。尽管如此，可以改进现有的双频电压产生方法，以实现更好的控制，更高的效率并减少电磁干扰。这封信建议使用多电平逆变器同时提供两个频率的功率。它描述了如何确定此类逆变器所需输出的步进角。此外，还提供了实验结果作为对该概念的验证，并证明了改进的谐波水平控制和降低的器件开关频率的实现。

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