The expressions of the Fourior series corresponding to these waves were derived and it is possible to analyse the harmonic contents of PWM inverter output in theory.
较严格的数学推导过程，为理论上对逆变器输出的谐波成分计算分析提供了依据。
The output waves of traditional resonant DC-Link inverter have too much low frequency harmonic waves which affect the output performance, because it can only use DPM control.
由于传统谐振直流环节逆变器只能采用离散脉冲调制方式，输出波形中含有丰富的低次谐波，严重影响输出性能。
The output of Amplifier has a filter, which can inhibit the out-off-band harmonic waves and unwanted emission component.
放大器的输出接有滤波器，可有效抑制带外谐波和无用发射分量。
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