Three‐phase soft‐switching‐based interleaved boost converter with high reliability

Abstract

One of the most important problems related to DC-DC converters is the phenomena of power switch failures. Therefore, applying soft-switching technique to these kinds of converters without adding extra active switch would improve their reliability. In this study, a new high reliable topology with the facility of the soft-switching operation for three-phase interleaved boost converter is proposed. The proposed structure is implemented by adding three inductors to the conventional structure. Automatically, the used power switches in the suggested topology, are turned on under zero voltage condition. In addition, the diodes are turned off under zero current condition. Using this method, the switching losses of semiconductors are reduced. Moreover, there is no additional active switch in the proposed topology. These two advantages cause the reliability of proposed topology to be significantly improved. The comparison results with other similar topologies are presented. Based on comparison results, it is shown that the reliability of the proposed topology is much better than others. Simulation and experimental results are compared with verifying the desired operation of the proposed structure.

Fuzzy-Logic-Based Mean Time to Failure (MTTF) Analysis of Interleaved Dc-Dc Converters Equipped with Redundant-Switch Configuration

“…Power electronic converters have major roles in renewable energy resources, energy storage systems, electric or hybrid electric vehicles (HEVs), and aerospace application [1][2][3][4]. Isolated Gate Bipolar Transistors (IGBTs) and Metal-Oxide-semiconductor Field-Effect Transistors (MOSFETs) are two well-known power switches, which are the main active components in power converters.…”

“…The probability of successful operation of the fault-managing system is considered P C . For example, as shown in Figure 4, the transition rate from three-phase-converter state to two-phase-converter state is 3P c λ (3) . If the fault-managing system fails, the probability of the transition from three-phase-converter state to the absorbing state is 3(1 − P c )λ (3) .…”

“…1 MTTF The MTTF of the single-phase and two-phase converters can be evaluated by referring to Figure 4. The Markov model of the two-phase operation can be obtained by assuming λ (3) = 0. As the same, the Markov model of the single-phase converter is obtained by considering λ (3) = 0, and λ (2) = 0.…”

“…The Markov model of the two-phase operation can be obtained by assuming λ (3) = 0. As the same, the Markov model of the single-phase converter is obtained by considering λ (3) = 0, and λ (2) = 0. With respect to Equations (2)-(4), the junction temperatures and temperature factors of the switches in the studied converters are listed in Table 1.…”

“…As shown in Figure 5, the basic failure rate is considered as a fuzzy function The triangular memberships depend on three constant parameters a, b, and c, (a=0.01, b=0.012, and c=0.014 for the basic failure curve and a=0.6, b=0.7 and c=0.8 for the probability of successful operation of the fault managing system curve), according to Table 1 and the basic failure rate, the failure rates of power switches in different redundant configuration can be obtained. As seen in Figure 3, to calculate MTTF of a single-phase, two-phase and three-phase converter, (3)…”