The project presents a new bridgeless buck-boost PFC with the use of the Active Virtual Ground technique which is named as Manitoba Rectifier. The proposed topology can convert the grid AC voltage into a wide range of voltage outputs within a single stage circuit. It is in bridgeless structure and simple in design. During the operation, a LC filter is generated at the system input where a continuous grid current is able to be guaranteed in a buck-boost characteristic topology. In addition, the filter capacitor helps to clamp the voltage ripple between the grid and the output bus terminal, both leakage current and common mode noise are also kept in a relatively small value. Thus, a single stage and low common-mode buck-boost converter system is built.      

The major building blocks of this project are:

• Buck-boost.
• High efficiency.
• Bridgeless buck-boost PFC.
• Power factor correction.
• LCD display.
• Crystal oscillator.
• Reset button.
• LED indicator.LED indicators.

       

Software’s used:  

• PIC-C compiler for Embedded C programming.
• PIC kit 2 programmer for dumping code into Micro controller.
• Express SCH for Circuit design.

           

Block Diagram:          

video: