Analytical model of the half bridge series resonant inverter for improved power conversion efficiency and performance

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IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT
ANALYTICAL MODEL OF THE HALF-BRIDGE SERIES RESONANT INVERTER
FOR IMPROVED POWER CONVERSION EFFICIENCY AND PERFORMANCE
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 “ANALYTICAL MODEL OF THE HALF-BRIDGE
SERIES RESONANT INVERTER FOR IMPROVED POWER CONVERSION
EFFICIENCY AND PERFORMANCE” 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 “ANALYTICAL MODEL OF THE HALF-
BRIDGE SERIES RESONANT INVERTER FOR IMPROVED POWER CONVERSION
EFFICIENCY AND PERFORMANCE” 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:

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ACKNOWLEDGEMENT
I am extremely glad to present my project “ANALYTICAL MODEL OF THE HALF-
BRIDGE SERIES RESONANT INVERTER FOR IMPROVED POWER CONVERSION
EFFICIENCY AND PERFORMANCE” 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:
Resonant power conversion is a key enabling technology of dc–dc conversion, inverters
and contactless energy transfer systems. This paper presents an analyticalmodel of the series
resonant half-bridge topology aimed at improving the design, control, and efficiency of resonant
power converters. The main contribution is a closed-form expression of the main converter
waveforms as well as output power and efficiency. This model enables a fast design-space
exploration, as well as the implementation of advanced control techniques using adaptive control
or real-time emulation, significantly improving the converter operation. The analytical
expressions presented have been applied and verified through a half-bridge series resonant
inverter applied to induction heating applications, proving the accuracy and effectiveness of the
proposed model.

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INTRODUCTION:
Among the available topologies, the series resonant full/half-bridge topology is one of the
most used topologies due to its good balance between cost, performance, and control complexity.
In the past, several research works have reported analyses of the series resonant half-bridge
topology.
Most of them provide steady-state results based on the Fourier transform, but in the form
of an infinite sum of terms. As a consequence, it is not possible to obtain certain conclusions,
such as the required modulation parameters to obtain some modulation profile, without carrying
out a massive parameter-variation simulation.
Other analyses make some assumptions, such as considering the fundamental harmonic
approximation. However, this approach may not be accurate enough when high load variability
is considered, typical of IH and CET systems. The nonresonant version of the half-bridge
inverter, that is, considering infinite capacitance, is also analyzed.
The objective of this paper is to develop an analytical model for the resonant inverter
operation and the power converter losses. It enables a rapid evaluation of both transient and
steadystate converter operation, including the resonant converterwaveforms, devices stress,
power losses, and efficiency.
By using the proposed model, the impact of the power devices in the converter efficiency
can be directly computed, enabling a further devices optimization process for a given set of
restrictions. Consequently, the proposed model enables an easier and fast design space
exploration taking into account important parameters of CET systems such as load coupling and
variability, power converter operating point, and their influence on the efficiency and
performance of the converter.

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Besides, having closed-form expression improves the converter operating point
awareness and enables the implementation of real-time adaptive control schemes and/or real-
time emulation taking advantage of modern digital control techniques. Consequently, both the
design process and the operation of the resonant power converter can be significantly improved.

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EXISTING SYSTEM:
Classical IH solutions are based on two separated stages: a rectifier plus a resonant
inverter. First, a four-diode full bridge rectifier is commonly used to rectify the mains ac voltage.
A small value dc-link capacitor is used to ensure an input power factor close to 1. Thus, a high-
ripple dc-link voltage is used to supply an inverter stage. Consequently, the switching devices
must withstand higher current levels, whereas the required filter stage is minimized. Considering
the typical output power level and the operating frequency range, the half-bridge series resonant
inverter (HB-SRI) featuring insulated-gate bipolar transistors (IGBTs) is commonly used for the
domestic IH applications

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PROPOSED SYSTEM:
The objective of this paper is to develop an analytical model for the resonant inverter
operation and the power converter losses. It enables a rapid evaluation of both transient and
steady stat converter operation, including the resonant converter wave forms, devices stress,
power losses, and efficiency.
By using the proposed model, the impact of the power devices in the converter efficiency
can be directly computed, enabling a further devices optimization process for a given set of
restrictions. Consequently, the proposed model enables an easier and fast design space
exploration taking into account important parameters of CET systems such as load coupling and
variability, power converter operating point, and their influence on the efficiency and
performance of the converter.
Besides, having closed-form expression improves the converter operating point
awareness and enables the implementation of real-time adaptive control schemes and/or real-
time emulation taking advantage of modern digital control techniques. Consequently, both the
design process and the operation of the resonant power converter can be significantly improved.
The proposed analytical model is based on a two-steps description model. In a first step, the
resonant behavior of the converter is described in order to model the converter operation,
neglecting the effect of the switching devices and the snubber network. Then, in a second step,
the influence of the power devices on the converter efficiency, including snubber network, is
analyzed.

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ADVANTAGES:
 Lower switching loss

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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:
 High efficiency and power density dc-dc conversion.
 High-frequency inverters.
 Induction heating (IH).
 Contactless energy transfer (CET) systems.

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CONCLUSION:
In this paper, an analytical model of the half-bridge series resonant inverter has been
proposed. One of the most important contributions of this model is that results are directly
obtained from closed-form expressions, reducing simulation time and enabling real-time control
and emulation techniques. The main waveforms of the converter are directly calculated, allowing
extract control parameters required to operate the desired switching mode. In addition, a closed-
form expression of the output power has been also obtained as a function of the main control
parameters, valid for any modulation profile. The main converter power loss has been studied.
On the one hand, an analytical model has been obtained for conduction losses, proving that
conduction efficiency is constant with output power and only depends on the load, supply
voltage, and conduction parameters of the switching devices. On the other hand, an analytical
model for the switching losses, focused on the ZVS mode, has also been obtained. The analytical
model presented in this paper has been verified experimentally through an induction heating
inverter, showing a good agreement between theoretical and experimental results. Besides, a
design example of a resonant inverter for induction heating applications taking advantage of the
proposed model has been detailed. These results prove the accuracy of the proposed model and
its suitability as a tool to improve both the design process and the converter operation.

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REFERENCES:
[1] F. Weiyi, F. C. Lee, and P. Mattavelli, “Optimal trajectory control of LLC resonant
converters for LED PWM dimming,” IEEE Trans. Power Electron., vol. 29, no. 2, pp. 979–987,
Feb. 2014.
[2] H. Sarnago, O. Luc´ıa, A. Mediano, and J. M. Burd´ıo, “Multi-MOSFETbased series resonant
inverter for improved efficiency and power density induction heating applications,” IEEE Trans.
Power Electron., vol. 29, no. 8, pp. 4301–4312, Aug. 2014.
[3] J. Jordan, V. Esteve, E. Sanchis-Kilders, E. J. Dede, E. Maset, J. B. Ejea, andA. Ferreres, “A
comparative performance study of a 1200VSi and SiC MOSFET intrinsic diode on an induction
heating inverter,” IEEE Trans. Power Electron., vol. 29, no. 5, pp. 2550–2562, May 2014.
[4] F.Weiyi, F. C. Lee, and P.Mattavelli, “Simplified optimal trajectory control (SOTC) for LLC
resonant converters,” IEEE Trans. Power Electron.,a vol. 28, no. 5, pp. 2415–2426, May 2013.
[5] H. Sarnago, O. Lucia Gil, A. Mediano, and J. Burdio, “Class-D/DE dualmode- operation
resonant converter for improved-efficiency domestic induction heating system,” IEEE Trans.
Power Electron., vol. 28, no. 3, pp. 1274–1285, Mar. 2013

Analytical model of the half bridge series resonant inverter for improved power conversion efficiency and performance

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Analytical model of the half bridge series resonant inverter for improved power conversion efficiency and performance