A novel wall switched step-dimming concept in led lighting systems using pfc zeta converter Do Your Projects With Technology Experts... To Get this projects Call : 9566355386 / 99625 88976 Visit : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com

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A Novel Wall-Switched Step-Dimming
Concept in LED Lighting Systems using PFC
Zeta Converter
Abstract
Introduction:
Owing to the advantages of LED solutions in lighting
industries, this is an attractive field of study and research. The
fundamental requirement of an LED is the constant drive current
irrespective of AC mains conditions and the number of LEDs
connected in a load. Increasing drive current can increase
junction temperature (Tj) which reduces light output thus the
overall efficacy of the system. In recent years, single stage DC-
DC power converters have been widely used for PFC as well as
regulation for an LED load. Among the different DC-DC
converters, six basic topologies have wide acceptance in
industry viz. buck, boost, buck-boost, Cuk, SEPIC (Single-
Ended Primary Inductor Converter) and Zeta converter. Except
Zeta converter, all other converters are widely studied and used
for PFC (Power Factor Correction) operation of LED power
supplies in different modes of operation such as CCM
(Continuous Conduction Mode), BCM (Boundary Conduction
Mode) and DCM (Discontinuous Conduction Mode) [3-8]. The

2. Do Your Projects With Domain Experts…
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
research on lighting applications using the Zeta converter has
been unexplored since long time.
Existing system:
The Zeta converter has discontinuous input current in
comparison to SEPIC and Cuk converters, due to its
configuration, but it has less ripple contents at output than a
SEPIC converter. This reduced ripple output is very much
recommended to power certain types of loads such as LEDs
which are extremely sensitive to the voltage variations. Owing
to the nature of discontinuous current at output, SEPIC converter
requires bigger DC link capacitor (E-cap) hence more cost as
compared to Zeta converter to attain the same permissible ripple
contents to the LED load over the universal AC mains.
Proposed system:
This paper presents an attractive application of Zeta
converter in low power LED lighting systems with high power
factor and very low harmonic distortions over the universal AC
mains with a novel current injection step-dimming concept. For
low power application, DCM is preferred due to its inherent
PFC capabilities with reduced control circuitry.

3. Do Your Projects With Domain Experts…
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:
Zeta
converter
BUFFER circuit
5VDC
PIC controller
circuit
OPTO coupler
circuit
12 V DC
Single
phase AC
supply
Diode
bridge
rectifier
Load
STRIP
LED

4. Do Your Projects With Domain Experts…
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:
 PFM offers better regulation in light load conditions and
reduces switching losses by sometime skipping pulses
when not required.
Applications:
 Light Emitting Diodes (LEDs).
Tools and software used:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.