Abstract
The Series Resonant Full Bridge operating in Discontinuous Conduction Mode (DCM) at fixed frequency, SRFB-DCM, is an interesting topology to provide isolation in the interface to main buses while having high efficiency thanks to Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS). As this converter cannot be regulated, usually, it is more interesting for regulated buses or in case there is post-regulation. This converter finds application in Power Processing Units for Electrical Propulsion and in any secondary high power front-end converter.Despite its simple design without regulation, in general, the dynamic behaviour of resonant converters is difficult to predict. A model is necessary to predict compatibility with input and output interfaces (stability, output impedance, start-up in-rush,…), avoiding late discovery of oscillations, for example.This paper presents a method to obtain the theoretical dynamic model of the SRFB-DCM with fixed frequency and duty cycle which seems easier to understand but surprisingly not treated in literature. Results are contrasted with simulations.
Highlights
This paper presents a method to obtain the theoretical dynamic model of the SRFB-Discontinuous Conduction Mode (DCM) with fixed frequency and duty cycle which seems easier to understand but surprisingly not treated in literature
A lot of literature can be found about modelling the DC characteristics of the Series Resonant Full Bridge, SRFB, and other resonant converters operating both in Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM), [1], [2], with frequency/duty as controlling variables, but little about dynamics [3]
It is possible to improve further the efficiency by enabling Zero Voltage Switching (ZVS) having an inductance in parallel with the tank or using the magnetizing current to have a small current in the switches during the dead time
Summary
A lot of literature can be found about modelling the DC characteristics of the Series Resonant Full Bridge, SRFB, and other resonant converters operating both in Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM), [1], [2], with frequency/duty as controlling variables, but little about dynamics [3] This is one of the most difficult topics in power electronics. In DCM, the DC transfer function is unity, being output voltage (affected with turns ratio) equal to input voltage independently of the load (assuming no converter losses) and switching frequency as long as DCM operation is maintained. It is possible to improve further the efficiency by enabling Zero Voltage Switching (ZVS) having an inductance in parallel with the tank or using the magnetizing current to have a small current in the switches during the dead time
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