由于直流供电电源纹波的影响，电压控制SPWM逆变电路的输出谐波分量幅值较大。
Because of the ripple of the DC power supply, the output harmonic amplitude of the voltage controlled SPWM inverter is higher.
论文采用直流斩波原理，利用体积小、重量轻、效率高、可靠性好的开关电源作为直流供电电源。
With chopping principle, switching power supply is chosen as the DC power supply because of its small size, low weight and high efficiency.
主要是提供电磁铁的直流电源及完成(吸、放料)控制要求。
The main purpose is to provide DC power supply and complete (suction, discharge) control requirements.
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