11-03-2014, 04:31 PM
Analysis of Bridgeless PFC Boost Converter
Analysis of Bridgeless.pdf (Size: 487.48 KB / Downloads: 47)
Abstract
Conventional boost PFC converter has
disadvantage having high conduction loss in the
rectifier-bridge. Bridgeless PFC boost converter
reduces conduction loss and improves efficiency
by omitting rectifier-bridge. This converter has
advantages like reduced conduction loss, reduced
hardware and high performance. This paper
presents simulation of bridgeless PFC boost
converter, also called dual boost PFC rectifier.
This bridgeless PFC circuit has much higher
common mode EMI than conventional PFC
circuit. Common mode EMI is reduced by adding
slow recovery diodes in bridgeless PFC circuit.
Power factor is more improved by adding
capacitor in parallel with AC source.
Introduction
Presently, there is increasing demands of high
power factor and low total harmonic distortion in
the current drawn from the utility. There is a
requirement of good power quality; significant
efforts have been made for the developments of the
PFC converters. The boost topology is widely used
as PFC converter.
Simulation & Results
Simulation is done in MATLAB and the obtained
results are presented. Simulation of modified boost
converter is shown in fig. 8a. The input current and
voltage is shown in fig. 8b & 8c respectively.
Similarly, the Voltage across MOSFET 1 & 2 is
shown in fig. 8d & 8e respectively. Further, the
output dc voltage and current are shown in fig. 8f
& 8g respectively. The active and reactive power is
shown in fig. 8h, where the blue line indicates
active power and green line reactive power. The
output voltage is boosted to 199.7 V. The
calculated value of pf is 0.8037. Thus, power factor
correction is done.
Conclusion
Fig. 9a. Capacitor in parallel with AC source in
modified boost converter
Fig. 9b. Input voltage
In this paper, the bridgeless PFC boost converter
with two dc/dc boost circuits is selected as a
representative member of bridgeless PFC boost
rectifier family. The bridgeless PFC boost
converter is
analyzed, modeled and simulated
using MATLAB. It has advantages like high
efficiency, low conduction loss & less components.
But, it has larger common mode EMI than
conventional PFC converter. It is reduced by
adding slow recovery diodes in bridgeless PFC
circuit.