Quasi-Boundary Method for Design Consideration of Resonant DC-DC Converters

Abstract

The paper presents a new unified method for designing the two basic types of serial resonant DC-DC converters (series and with a parallel-loaded capacitor). The method is based on the use of a simplified generalized approach for the analysis of this type of power electronic devices. It is characterized by the fact that regardless of the specific operating mode, with a control frequency below or above the resonant of the series resonant circuit to determine the relationship between input and output voltage or current, it is assumed that the converter operates in resonance. In this sense, it is called a quasi-boundary method for analysis and design. The use of the quasi-boundary method significantly accelerates and facilitates the design of the considered power circuits, which is very useful for the purposes of engineering practice, as well as in the training of power electronics. The applicability of this approach is proven by the methods of mathematical modeling and computer simulations.

A Unified Approach to the Analysis of DC/AC Converters, Based on the Study of Electromagnetic Processes in a Series RLC Circuit

“…The series RLC circuit under consideration is described by the following differential equation with respect to the capacitor voltage [16,22]:…”

“…It is formed by the sequential operation of the semiconductor switches (transistors and reverse diodes) of the inverter with a switching frequency f = 1/T. When operating in an established mode and fulfilling the condition for resonance-R < 2 L C the following expressions of the current through the inductance and the voltage of the capacitor are valid for the circuit under consideration [22,25,26]:…”

“…Most often, the analysis is performed on the basis of determining the actual form of the current in the AC circuit, usually ignoring the damping of the resonant circuit [1,16,20,21]. Due to the specificity of the load, this approach gives good results in the analysis and design of the resonant DC/DC converters, but in the case of resonant DC/AC converters with industrial applications and induction hobs, this approach leads to significant deviations compared to the exact analyses [22].…”

Design Consideration of Resonant Inverters with Electro-Technological Applications Based on a Simplified Mathematical Approach

“…The time diagrams presented in Figure 4 provide an opportunity to evaluate the deviations of the real form of the current in the AC circuit with that of operation in the border mode (ν =1). From them, it is found that the differences are insignificant and do not significantly affect the design accuracy [32].…”

Maximum Power Point Tracking Techniques for Photovoltaic Panel: A Review and Experimental Applications

“…The first mentioned refers to an electrical limit (such as a transformer) amid the inputs and outputs which allows the usage for high voltages. Examples of these types are flyback, forward, resonant, push-pull and bridge [16][17][18][19][20]. In the non-isolated, the configuration indicates that the mentioned barrier is vanished and therefore, the efficiency tends to be higher since the number of components is lower [21].…”