| With the development of modern industry, power supply becomes more and more important in work, life and education. Modern power technology is a intersect subject which synthesizes such subjects as semiconductor, auto-control, computer and electro-magnetism. It plays a key role in all kinds of high quality, efficiency and reliability power supply.Steady voltage power supply of modern switching has been widely applied in many fields,such as DC power supply, AC power supply, industry power supply, computer power supply, UPS power supply, power supply of medical treatment and lighting, high voltage power supply of radar, power supply of sound and video frequency and so on. On which the inverter is widely applied in the power motor drive system and develops more and more fast.Based on the consideration of simple configuration, high performance and low cost, the Sinusoidal Pulse-Width Modulation Inverter described in this paper mainly use the integrated chip of HEF4752 to generate SPWM signals which are isolated with an opto-coupler and then to drive the 3 phase inverter. Then the SPWM waveforms that have high voltages are generated, though filters which become Sinusoidal AC signals and are supplied to loads. So, the frequency of the Sinusoidal AC signals changes with the variability of the SPWM waveforms' frequency. This paper detailedly describes its work course of the inverter power supply and tests its feasibility and stability with experiments. |
