The document presents an analytical model for the half-bridge series resonant inverter, aiming to improve power conversion efficiency and performance by offering a streamlined evaluation of converter operations and losses. It highlights the advantages of lower switching loss, applicability to high-efficiency dc-dc conversion, and suitability for induction heating and contactless energy transfer systems. The study emphasizes the importance of a closed-form expression for better design processes and operational improvements using modern control techniques.

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Analytical Model of the Half-Bridge Series
Resonant Inverter for Improved Power
Conversion Efficiency and Performance
Abstract
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.

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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.
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

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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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Mail : projects@lemenizinfotech.com
Advantages
 Lower switching loss.
Applications
 High efficiency and power density dc-dc conversion.
 High-frequency inverters.
 Induction heating (IH).
 Contactless energy transfer (CET) systems.

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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
Tools and software
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.
INPUT DC
SUPPLY
SWITCHING
CIRCUIT
ISOLATION CIRCUIT
PIC CONTROLLER WITH
BUFFER
5V DC
12V DC
LOADRESONANT
CIRCUIT