Three-phase soft-switching inverter with coupled inductors, experimental results

Abstract

Abstract. This paper presents experimental results of the three-phase soft-switching inverter with coupled inductors that verify the control method influence on efficiency improvement. Different kinds of control methods were tested on the 6 kW experimental inverter. A short discussion on a few design methods of the resonant tank elements was made. Experimental results confirm that the advanced control algorithm and the proposed new design method of the resonant tank elements significantly increase the efficiency of this resonant inverter.

Bulletin of the Polish Academy of Sciences: Technical Sciences

“…One of the solution to limit these problems is the concept of the auxiliary resonant commutated pole inverter (ARCPI) [5]. Recent achievements in control of current in resonant branch and design of resonant tank components [6][7][8] indicate a potential of efficiency improvement for this technique. However, the ARCPI features complexity with auxiliary resonant pole switches, diodes, inductors or coupled inductors, that are associated with each inverter phase leg.…”

Modifications of the soft switching system resistant to disturbances in control systems of voltage sources inverters

“…In this case the soft switching circuits have more complicated structures in comparison to the inverters with central auxiliary circuits, but the VSIs can operate with higher switching frequencies. In some individual solutions, the structure of auxiliary resonant circuits includes special transformers [20][21][22]. Figure 2 presents, for example, one of the most often soft switching system presented in literature [13,16].…”

“…Figure 2 presents, for example, one of the most often soft switching system presented in literature [13,16]. In the majority of the existing soft switching systems, the auxiliary circuits consist of capacitors connected in parallel to the main transistors [8,10,20] and resonant coils which are connected in series to auxiliary transistors [7,9,10,13,16]. These connections are not recommended because the main or auxiliary transistor can be damaged during disturbances in control systems.…”

Advanced control and design methods of the auxiliary resonant commutated pole inverter

“…4b [6] is overvoltage that appears when transformer current falls to zero. Saturated inductor added serially to transformer helps to discharge energy accumulated in its magnetic circuit and overvoltage is eliminated [7]. In comparison with a solution in Fig.…”