Abstrakt

A Single-Phase Ac-Dc Converter with Improved Efficiency Using Atmega8 Microcontroller

Bhuvaneswari.K, Niruba. K

This paper proposed an AC-DC semi-bridgeless boost converter with 180 degree phase shift and less number of switches. The simplified current sensing method is applied in the converter to predict the inductor. The proposed converter has the advantageous features such as high efficiency at light loads and low ac input lines; compact in size, less charging time, and less amount and cost of electricity drawn. This project presented simulation results of a boost converter, converting the 230V ac input voltage to 400 V dc at upto 3kW Load. The power factor of the proposed system is maintained above 0.9 and the THD level is below 5%. The converter can works with less EMI. This type of converters is used for vehicle charging and residential charging application. The ATMEGA8 micro controller is for the controlling process, which has fast response with RISC architecture. With solar source the semi bridgeless converter can acts as the dc-dc boost converter.