Abstract
Inverter is a power electronic circuit that converts the direct voltage (DC) to an alternating voltage (AC). Inverters are used in a range of applications from consumer electronics and industrial to renewable energy. The flexible capability to create an AC signal from a DC voltage, frequency and speed control are all accomplished from the use of Inverter. Inverter takes the voltage and passes it through switching elements which turn the DC signal into an AC square wave signal. This wave is then passes through filter which turns it into a sine wave signal of the required voltage. This paper presents design an inverter with overcurrent protection circuit without microcontroller, where the MOSFET gate driver is controlled by pulses generated from 555 timer, and with using a low pass filter and setup transformer, a low cost sine wave inverter has been obtained. The heart of the design is 555 timer. The design is achieved in Proteus 8. Simulation results demonstrated that a single phase sine wave (50 Hz) has been generated by a half bridge inverter and a full bridge inverter and protection circuit from current higher than 4.5A has been built. The reliability and accuracy of the system are verified through an experiment.
Highlights
Pure sine wave inverter is demand of modern era, it increases the efficiency of the power system and prevent the electrical components from damaging [1]
The electrical power is not continuous in Iraq especially in summer season because, the amount of generation is insufficient for the increasing loads, increasing the voltage drop in wires, and absence power quality requirements such as, harmonics filter, dynamic voltage restorer (DVR), DSTATCOM etc, this lead to frequent interruptions of electrical energy per day, so consumers using inverter to run lights, charger, fans and other small appliances that need a little current
Sine wave can be obtained from pulses or square wave after its passage through a low pass filter as shown in the simulation result of the electronic circuit which introduced in figure 5
Summary
Pure sine wave inverter is demand of modern era, it increases the efficiency of the power system and prevent the electrical components from damaging [1]. In practice loads operate with an alternating voltage, because generation and transmission cost of the alternating voltage is much less than in the case of the direct voltage [2]. The alternating voltage cannot be stored, so it is converted to direct voltage to store in batteries and reconverted to an alternating voltage using an inverter to be used in operating loads when the main grid power outage [3]. The electrical power is not continuous in Iraq especially in summer season because, the amount of generation is insufficient for the increasing loads, increasing the voltage drop in wires, and absence power quality requirements such as, harmonics filter, dynamic voltage restorer (DVR), DSTATCOM etc, this lead to frequent interruptions of electrical energy per day, so consumers using inverter to run lights, charger, fans and other small appliances that need a little current. Commercial inverters generate a square wave or a semi-square wave which are contain high harmonics that cause overheating, noise, and reduce the service life of the devices [4], so a sinusoidal inverter with overcurrent protection circuits at a cost roughly equal to the cost of the square wave inverter is introduced in this search
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