A unity power factor bridgeless isolated cuk converter fed brushless dc motor drive

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A UNITY POWER FACTOR BRIDGELESS ISOLATED CUK CONVERTER-FED
BRUSHLESS DC MOTOR DRIVE
By
A
PROJECT REPORT
Submitted to the Department of electronics & communication Engineering in the
FACULTY OF ENGINEERING & TECHNOLOGY
In partial fulfillment of the requirements for the award of the degree
Of
MASTER OF TECHNOLOGY
IN
ELECTRONICS & COMMUNICATION ENGINEERING
APRIL 2016

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CERTIFICATE
Certified that this project report titled “A UNITY POWER FACTOR BRIDGELESS
ISOLATED CUK CONVERTER-FED BRUSHLESS DC MOTOR DRIVE” is the bonafide
work of Mr. _____________Who carried out the research under my supervision Certified
further, that to the best of my knowledge the work reported herein does not form part of any
other project report or dissertation on the basis of which a degree or award was conferred on an
earlier occasion on this or any other candidate.
Signature of the Guide Signature of the H.O.D
Name Name

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DECLARATION
I hereby declare that the project work entitled “A UNITY POWER FACTOR BRIDGELESS
ISOLATED CUK CONVERTER-FED BRUSHLESS DC MOTOR DRIVE” Submitted to
BHARATHIDASAN UNIVERSITY in partial fulfillment of the requirement for the award of the
Degree of MASTER OF APPLIED ELECTRONICS is a record of original work done by me the
guidance of Prof.A.Vinayagam M.Sc., M.Phil., M.E., to the best of my knowledge, the work
reported here is not a part of any other thesis or work on the basis of which a degree or award
was conferred on an earlier occasion to me or any other candidate.
(Student Name)
(Reg.No)
Place:
Date:
ACKNOWLEDGEMENT

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I am extremely glad to present my project “A UNITY POWER FACTOR BRIDGELESS
ISOLATED CUK CONVERTER-FED BRUSHLESS DC MOTOR DRIVE” which is a part
of my curriculum of third semester Master of Science in Computer science. I take this
opportunity to express my sincere gratitude to those who helped me in bringing out this project
work.
I would like to express my Director, Dr. K. ANANDAN, M.A.(Eco.), M.Ed., M.Phil.,(Edn.),
PGDCA., CGT., M.A.(Psy.) of who had given me an opportunity to undertake this project.
I am highly indebted to Co-Ordinator Prof. Muniappan Department of Physics and thank from
my deep heart for her valuable comments I received through my project.
I wish to express my deep sense of gratitude to my guide
Prof. A.Vinayagam M.Sc., M.Phil., M.E., for her immense help and encouragement for
successful completion of this project.
I also express my sincere thanks to the all the staff members of Computer science for their kind
advice.
And last, but not the least, I express my deep gratitude to my parents and friends for their
encouragement and support throughout the project.

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ABSTRACT:
This paper presents a power factor correction (PFC)-based bridgeless isolated Cuk
converter-fed brushless dc (BLDC) motor drive. A variable dc link voltage of the voltage source
inverter (VSI) feeding the BLDC motor is used for its speed control. This allows the operation of
VSI in fundamental frequency switching to achieve an electronic commutation of the BLDC
motor for reduced switching losses. A bridgeless configuration of an isolated Cuk converter is
derived for the elimination of the front-end diode bridge rectifier to reduce conduction losses in
it. The proposed PFC-based bridgeless isolated Cuk converter is designed to operate in
discontinuous inductor current mode to achieve an inherent PFC at the ac mains. The proposed
drive is controlled using a single voltage sensor to develop a cost-effective solution. The
proposed drive is implemented to achieve a unity power factor at the ac mains for a wide range
of speed control and supply voltages. An improved power quality is achieved at ac mains with
power quality indices within the limits of the IEC 61000-3-2 standard.

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INTRODUCTION:
A BLDC motor consists of three-phase concentrated windings on the stator and
permanent magnets on the rotor. A three-phase voltage-source inverter (VSI) is used for
achieving an electronic commutation of the BLDC motor based on the rotor position as sensed
by Hall-effect position sensors.
A VSI-fed BLDC motor drive is generally supplied by a combination of a diode bridge
rectifier (DBR) with a high value of smoothening dc link capacitor. This combination of DBR
and dc link capacitor draws current only for a small duration when the instantaneous value of
supply voltage is higher than the dc link voltage.
Therefore, a peaky current is drawn from the ac mains, which has very high value of
harmonic contents. The total harmonic distortion (THD) of such current is of the order of 60%–
80% which leads to a very poor power factor (PF) of the order of 0.6–0.7 at ac mains.
Power factor correction (PFC) converters are used to avoid power quality problems at the
ac mains and to meet the prescribed guidelines of IEC 61000-3-2 . The sensing requirement of
this PFC converter plays amajor role in deciding the cost of the overall system.
The required number of sensors for a PFC converter is primarily decided by its mode of
operation of the PFC converter. Continuous inductor current mode (CICM) and discontinuous
inductor current mode (DICM) are two modes of operation of the PFC converter.
In CICM, or continuous conduction mode (CCM), the current in the inductor remains
continuous in a switching period, whereas the current becomes discontinuous in a switching
period for a PFC converter operating in DICM.

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The PFC converter operating in CICM uses a current multiplier approach for voltage
control and PFC. It has lower current stress on the PFC converter switch but requires three
sensors (2-V, 1-C) for its operation.
However, a single voltage sensor is used for a PFC converter operating in DICM using a
voltage follower approach, but at the cost of high current stress on the PFC converter switche.
Therefore, this mode of operation is suited for low-power applications.
A conventional boost-PFC converter has been widely used for power quality
improvements at ac mains. This converter has also been used at the front end of a VSI-fed BLDC
motor for PFC at ac mains

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EXISTING SYSTEM:
The boost converter charges a bulk energy storage capacitor to a voltage higher than the
peak line voltage. Finally a voltage-fed, step-down inverter is used to drive the brushless DC
motor. These capacitors are typically electrolytic and are physically large, expensive and failure
prone, limiting the lifetime of the drive. Under certain conditions efficiency may be improved by
the elimination of the boost stage

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PROPOSED SYSTEM:
A single-phase supply followed by an LC filter is used to feed a bridgeless isolated Cuk
converter. This maintains the required dc link voltage of the VSI and provides PFC at ac mains.
The proposed PFC converter is designed to operate in DICM to act as an inherent power factor
corrector. The dc link voltage of the VSI is controlled for adjusting the speed of the BLDC
motor. The VSI feeding the BLDC motor is operated in a low frequency switching to achieve an
electronic commutation of the BLDC motor for reduced switching losses. The proposed
configuration uses a single voltage sensor to control the dc link voltage for the speed control of
the BLDC motor.

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ADVANTAGES:
 Reduced the switching losses.
 Reducing the conduction losses in the front-end converter.

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BLOCK DIAGRAM:

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TOOLS AND SOFTWARE USED:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation

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APPLICATIONS:
 Household appliances.
 Industrial tools.
 Medical equipment.
 Precise motion control.
 Automation and transportation.

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CONCLUSION:
A new configuration of bridgeless isolated Cuk converter-fed BLDC motor drive has
been proposed for low-power household appliances. The speed control of the BLDC motor has
been achieved by controlling the dc link voltage of the VSIfed BLDC motor. This has facilitated
the operation of VSI in low frequency switching mode for reducing the switching losses
associated with it. This bridgeless isolated Cuk converter has been designed for the elimination
of the DBR at the front end for reducing the conduction losses in the front-end converter. This
PFC converter has been operated in DICM for dc link voltage control, and inherent PFC is
achieved at the ac mains. A prototype of the proposed drive has been implemented using a DSP.
Satisfactory test results for the proposed bridgeless isolated Cuk converter-fed BLDC motor

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REFERENCES:
[1] C. L. Xia, Permanent Magnet Brushless DC Motor Drives and Controls. Beijing, China:
Wiley, 2012.
[2] Y. Chen, C. Chiu, Y. Jhang, Z. Tang, and R. Liang, “A driver for the singlephase brushless
dc fan motor with hybrid winding structure,” IEEE Trans. Ind. Electron., vol. 60, no. 10, pp.
4369–4375, Oct. 2013.
[3] X. Huang, A. Goodman, C. Gerada, Y. Fang, and Q. Lu, “A single sided matrix converter
drive for a brushless dc motor in aerospace applications,” IEEE Trans. Ind. Electron., vol. 59, no.
9, pp. 3542–3552, Sep. 2012.
[4] J. Moreno, M. E. Ortuzar, and J. W. Dixon, “Energy-management system for a hybrid
electric vehicle, using ultra capacitors and neural networks,” IEEE Trans. Ind. Electron., vol. 53,
no. 2, pp. 614–623, Apr. 2006.
[5] P. Pillay and R. Krishnan, “Modeling of permanent magnet motor drives,” IEEE Trans. Ind.
Electron., vol. 35, no. 4, pp. 537–541, Nov. 1988.

A unity power factor bridgeless isolated cuk converter fed brushless dc motor drive

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A unity power factor bridgeless isolated cuk converter fed brushless dc motor drive