The multiple input DC voltage single output AC output PWM DC/AC inverter using a microcontroller is to achieve multiple voltage levels to improve square wave signal to improve power quality of output device. The principle of inverter the device which converts DC power to AC power at required output voltage and frequency level is known as inverter. Here multiple sources are connected to the different levels of inverter loads. Multilevel inverter as compared to single level inverters have advantages to minimize harmonic distortion, in order to reduce EMI/RFI can operate on several voltage levels can be improve . A multi-level inverter is used for multipurpose applications, such as active power filters, un-interrupted power supply, power inverters. and machine drives for sinusoidal and trapezoidal current applications. The drawbacks are the isolated power supplies required for each one of the stages of the multiconverter and it’s also lot harder to manufacture, more cost, harder control in software. This project aims at generation of carrier based PWM technique using POD strategy through it defines of an AT89C51 microcontroller. The features are: Firstly, Both the high frequency triangular wave and sinusoidal reference signal are being produced by microcontroller. The digital to analog converter(DAC0808)is then employed for converting them into their analog signal forms An op-amp based comparator then compares these two carrier & reference signals to give us the desired sinusoidal pulse width modulation signal as required final-output. The PWM signal thus generated is then used for the multilevel triggering pulse inverters.