定性地分析了各优化方法调制波的谐波特性，从本质上分析了它们降低开关损耗的基本思想。
The harmonic peculiarity of carrier waves of each optimized method and expresses elementary ideas in methods of decreasing switching dissipation above-mentioned essentially.
为了抑制高频发射噪声引起的电磁波泄漏，就需要开发频率高损耗大的电磁波吸收材料，有效地吸收噪声能量。
Electromagnetic absorbing materials with high frequency and high loss are required to absorb the noise energy, aiming at restraining the electromagnetic leak induced by high-frequency emission noise.
非线性电气负荷产生的喈波电流增大了电力系统热损耗和终端用户的用电费角。
The harmoic current from nonlinear electric load increases heat consumption in electric system and end-users' burden in electric cost.
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