Micro Inverter with Lithium Ion Battery

Abstract

There is an immense need of a small size of inverter globally. Nowadays an inverter is an important element for use as a back-up power supply and it is also an essential part in generating off-grid power through solar panels. Inverters available in the market are considerably big which takes up a lot of space. Our main objective is to successfully reduce the size of the inverter while maintaining the good efficiency with output of 220V and 150W. An inverter is used to convert DC voltage from the battery to AC voltage of the main supply. It also charges up the battery when not in use. Our inverter also filters out the abrupt power surges from the main supply power. This inverter is specifically designed as the universal supply. Its main use will be as an office equipment back-up supply, therefore requires fine sine wave at all time. The technique used is push-pull for the buck and boost as well. We used the Lithium Ion batteries instead of conventional Lead Acid batteries which takes a lot of room space. Lithium Ion batteries are not only small in size, they also have a greater life cycle with very low or no maintenance at all. Most of the commercial inverters available in Pakistan are simply PWM inverters. These inverters have high harmonics and are bulky to move around. Furthermore, they use car batteries as their battery which are dangerous to place in open home environment. These inverters are not only enormous in size but also inefficient for the office equipment use. Most importantly they don’t have any ability to control abrupt power surges.