High Gain Boost Interleaved Converters with Coupled Inductors and with Demagnetizing Circuits

Abstract

This paper proposes double interleaved boost converters with high voltage gain and with magnetically coupled inductors, while a third coupled winding is used for magnetic flux reset of the core during converter operation. The topology of the proposal is simple, it does not require many additional components compared to standard interleaved topologies, and it improves the transfer characteristics, as well as system efficiency even for high power levels. The investigation of steady-state operation was undertaken. It was discovered that the proposed converter can be designed for a target application where very high voltage gain is required, while adjustment of voltage gain value can be done through duty-cycle variation or by the turns-ratio modification between individual coils. The 1 kW prototype was designed to test the theoretical analysis. The results demonstrate that the proposed converter achieves very high voltage gain (1:8), while for the designed prototype the peak efficiency reaches >96% even when two additional diodes and one winding were implemented within the converter's main circuit. The dependency of the output voltage stiffness on load change is minimal. Thus, the presented converter might be a proper solution for applications where tight constant DC-bus voltage is required (a DC-DC converter for inverters).

Independent Double-Boost Interleaved Converter with Three-Level Output

“…Using (13) and different values of the parameter K, Figure 9 shows the DC conversion ratio, M(D, K), of the IDBIC boost converter for DCM Case 2.…”

“…On the other hand, this type of converter exhibits a limited voltage gain. High-gain interleaved DC-DC voltage converters in transformerless structures have been explored in various studies [10][11][12][13]. A floating, high-gain voltage interleaved converter widely employed in research studies was analyzed in [14,15].…”

System Level Simulation of Microgrid Power Electronic Systems

“…In addition, the voltage gain can also be changed by the ratio of the turns (inductances) of the coupled inductor, while it must be valid that N1 = N2 : N3. A detailed study regarding this topic is available in [25][26][27]. Table 1 shows that the improved dual interleaved converter has the best efficiency as compared with the individual alternatives, even the number of semiconductor switches is doubled.…”

The Study of the Operational Characteristic of Interleaved Boost Converter with Modified Coupled Inductor

“…Initially, the time waveforms on the inductors were investigated due to verification of the existence of AC magnetic flux of the L 3 , which serves for the core demagnetization. Finally, the focus was given on the evaluation of the efficiency and voltage gain performance for the selected duty cycle values [39][40][41][42]. At this point the turns ratio between L 1 and L 2 is equal to 1:1, while the turns ratio between L 1 and L 3 and L 2 and L 3 is 1:1,7.…”