Loss free resistor-based power factor correction using a semi-bridgeless boost rectifier in sliding-mode control To Get this projects Call : 9566355386 / 99625 88976 Visit : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com

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Call: 0413-4205444, +91 9566355386, 99625 88976.
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Mail : projects@lemenizinfotech.com
Loss-Free Resistor-Based Power Factor
Correction Using a Semi-Bridgeless Boost
Rectifier in Sliding-Mode Control
Abstract
Introduction:
Power factor correction (PFC) is one of the most active
research lines in the field of power processing because
electronic equipment must guarantee the compliance of standard
regulations. For the last 20 years, many power dc–dc converters
have been proposed for PFC applications. The solution is not
unique but it usually becomes a tradeoff between cost and
quality of the line current waveform. The most popular PFC
active power circuit consists of a boost converter connected to
the grid by a diode bridge rectifier, because of its main
advantages: grounded transistor, simplicity, and high efficiency.
However, the main drawback of this topology is the use of an
input diode bridge that produces the largest share of the total
losses. The need for a higher efficiency from the PFC stage has
led circuit designers to develop lower power losses alternatives
which avoid the use of the diode bridge, known as bridgeless
topologies. Several boost-based bridgeless PFC converters are
evaluated in terms of number of components, power factor (PF),

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efficiency and power losses. A performance evaluation of
bridgeless boost-based rectifiers is presented.
Existing system:
Compared to the conventional PFC boost converter, one diode is
eliminated from the line-current path, so that the line current
only flows through two semiconductors and, therefore,
conduction losses are reduced. When the AC input voltage goes
positive, the gate of S1 is driven high and current flows from the
input through the inductor LB, storing energy. When S1 turns
off, energy stored in the inductor gets discharged and the current
flows through diode D1, through the load and returns through
the body diode of switch S2. During the negative half cycle,
switch S2 is operated. When switch S2 turns on, current flows
through the inductor, storing energy. When S2 turns off, energy
stored in inductor is released and the current flows through D2,
through the load and back to the mains through the body diode
of switch S1. Thus, in each half line cycle, one of the MOSFET
operates as an active switch and the other one operates as a
diode. The difference between the bridgeless PFC and
conventional PFC is that in bridgeless PFC converter the
inductor current flows through only two semiconductor devices,

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
but in conventional PFC circuit the inductor current flows
through three semiconductor devices.
Proposed system:
A modification of the basic bridgeless PFC boost rectifier
by means of the addition of two slow recovery diodes (DA, DB)
and a second inductor (L2), this resulting in two dc–dc boost
circuits, one for each half-line cycle. This topology, known as
semi-bridgeless boost rectifier or dual-boost rectifier, is a more
suitable solution for practical implementation than the basic
bridgeless topology in terms of sensing the input voltage and
current variables. Basically, the semi-bridgeless rectifier is
configured by two different boost converters, with an extra
diode for each boost, that operate during each half-line cycle.
Therefore, the two active switches can be controlled
independently by the same control signal or other gating
techniques. It has been seen that a synchronous rectification only
contributes to decrease power losses in low power cases but this
improvement is lost when the on-state resistance increments as a
consequence of temperature rise-up of the MOSFET.

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Block diagram:
INPUT AC
SUPPLY
OPTO COUPLER CIRCUIT
PIC CONTROLLER WITH
BUFFER
5V DC
12V DC
LOADSEMI BRIDGELESS
BOOST RECTIFIER

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Advantages:
 Less conduction losses.
Tools and software used:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.