The main merits of DDS are high resolution and fast frequency switching speed, but the defects of low output frequency and bad spurious performance restrict the application of DDS.
DDS的主要优点是其高分辨率和高捷变速度，但是其较低的输出频率和较差的杂散性能制约了其应用。
It has significant advantages, such as less distorted output, lower switching frequency, etc, and it has reality energy conservation significance in application of the high - voltage and high-power.
多电平逆变电路具有输出谐波少、开关频率低等明显上风，非常适合应用于高压大功率的变频调速领域，具有现实的节能意义。
Since its output frequency is as twice as the device frequency and it has the merit of soft-switching characteristic, multiple-frequency induction heater is widely used in high frequency application.
倍频式感应加热电源负载输出频率为功率开关管工作频率的二倍，且功率开关器件工作时具有软开关特性，在需要高频应用的场合很有意义。
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