Three Phase DC AC Inverter

Mohd Safuwan, Masiron (2007) Three Phase DC AC Inverter. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project is about three-phase DC-AC inverter. Generally an inverter is used for high-power applications such as induction motor, air-conditioner and ventilation fans. This project is about to control the sequence frequency of an induction motor using the three-phase DC-AC inverter controller. Three-phase inverter can be formed by three single-phases inverters which are connected in parallel. The gating signals of singlephase inverters should be advanced or delayed by 1 20° with respect to each other to obtain three-phase balanced voltages. If the output voltages of single-phase inverters are not perfectly balanced in magnitudes and phases, the three-phase output voltages are unbalanced. A three-phase output can be obtained from a configuration of six MOSFET and six diodes. The MOSFET are controlled by a controller and a gate drive. The gate drive is a medium that will make sure the MOSFET can be operated smoothly and it will be applied between controller circuit and the MOSFET. Each gate drive will control one MOSFET, so it will need six gate drives in order to make this inverter operate. There are two types of control signals can be applied to the transistors which are 180° conduction and 120° conduction. The preferable method is 180° conduction because it has better uti! ization of the switches.

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