Snubberless boost full‐bridge converters: Analysis of soft switching performance and limitations

Abstract

Summary This paper analyses current‐fed (current source) isolated dc‐dc converters that are proposed for various renewable energy and dc microgrid applications, such as photovoltaic, fuel cell, or energy storage systems. The analysis addresses current‐fed (boost) full‐bridge converters that achieve clamping and soft switching without dedicated external auxiliary circuits, such as snubbers or clamps. Such converters have certain limitations that can lead to degraded performance and feasibility due to high circulating energy or low silicone utilization at some operating points. The current study reveals these limitations, highlighting advantages and drawbacks of selected snubberless converters at different operating conditions. The relation between the rms input current and the isolation transformer primary current as well as the cumulative rms current of primary semiconductors is used as figure of merit for converter characterization. This approach can be extended and applied to other topology types and used as a universal tool for performance assessment of snubberless converters without auxiliary circuits for particular operating conditions in various systems.

Quasi Single-Stage Three-Phase Filterless Converter for EV Charging Applications

“…Taking into account the complexity associated with implementation of existing three-phase concepts featuring unfolding rectification, the authors propose to use a configuration of VRU in connection with two isolated current-source converter (CSC) modules for an off-board charging of electric vehicles [31]. To address the common issue of isolated CSCs that is related to transformer leakage inductance, the chosen module is based on the currentsource asymmetric secondary-modulated DC-DC converter (ASMC) topology [32] operating in the PFC mode. The main advantages of the ASMC when compared to other isolated CSC topologies are in low circulating current, constant operating frequency, absence of extra snubbers and the capability to provide desired functionality using only one independent control variable [26].…”

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“…Серед типових топологій перетворювачів, що відповідають перерахованим вимогам, можна виділити мостові перетворювачі з проміжною високочастотною ланкою та м'якою [16] або жорсткою комутацією [17], двоспрямований перетворювач без гальванічного розділення з жорсткою комутацією [18].…”

Analysis of Fault-Tolerant Operation Capabilities of an Isolated Bidirectional Current-Source DC–DC Converter

“…Theoretically, reconfiguration to other topologies, like parallel-resonant converters [32,[36][37][38], is also possible. However, that requires significant changes in the control and strongly affects the regulation capabilities.…”