Abstract
Original scientific research The proposed PWM switch modelling technique is a simple method for modelling push-pull based single phase inverters operating in continuous conduction mode. In the design process of converters it is desirable to assess as many critical design parameters and parasitic effects by simulation as possible, since the control is hard to tune after fabrication. The main advantage of this method is its versatility and simple implementation. Furthermore, the introduced model also includes parasitic elements of the components to better estimate the converter behaviour. The resulting circuit is a time averaged model where all currents and voltages correspond to their averaged values. The validity of this model is verified by the given experimental results for a specified design example. This modelling technique helps to design the inverter effectively and better choosing the controller component values to achieve a good dynamic response. Finally, current mode controlled push-pull converter is simulated and compared with proposed modelling technique where a good accordance between them is revealed. Simulation analysis is done by Matlab 9 and Psim 6 software. The overall modelling estimation error was lower than 5 %.
Highlights
During the past decades, power electronic research has focused on the development of new families of inverter topologies used in portable applications
This paper introduces a way to simplification and modelling of a two stage single phase inverter structure by averaging the switch network
First block uses an isolated push-pull converter to convert the input voltage VI (12 VDC) to middle output voltage V’o (312 VDC) and the second block composed of a full-bridge converter, inverts the middle voltage (V’o) to alternative rectangular output voltage across the load that is named by Vo (220 Vrms)
Summary
Power electronic research has focused on the development of new families of inverter topologies used in portable applications. The SSA method requires considerable matrix algebra manipulation and is sometimes tedious, especially when the converter circuit contains a large number of elements It provides little insight into the converter behaviour. The circuit averaging method leads to linear circuit models which are relatively simple and provide good intuitive insight into converter behaviour. It can be used for deriving various transfer functions, step responses and is compatible with electronic circuit simulators. By replacing the switching network in a PWM converter by its small signal circuit, the entire power stage model is obtained. Experimental results for a 100 W inverter reveal the validity and precision of the proposed method
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