A novel design and implementation of a 3-φ inverter system

This paper presents a novel design and implementation of a 3-Phase, 400 Hz, 1 KVA sinusoidal PWM inverter. The input voltage (45-48 V DC) obtained from photovoltaic cell, is stepped up into 200 V DC with fly-back converter and regulated with current mode control method, applied to a 3-phi bridge system. A sinusoidal PWM generator is used as firing circuit for turn-on and turn-off of the MOSFETpsilas used in the thyristor bridge. A 120 V AC line-line sinusoidal AC voltage is obtained as output. The designed and implemented inverter system has a wide number of applications such as in warship, airships, satellite controls and in defense applications. The main advantage being, the input DC voltage is boosted at the input side rather than at the load side as a results of which it reduces the harmonics, makes compact and more stable. The simulation & experimental results presented in this paper shows the effectiveness of the proposed design.