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This paper introduces a new two-phase interleaved flying-capacitor LLC converter topology with high output current applications. Compared to a conventional two-phase LLC converter, the new converter adds a single capacitor that contributes to lower voltage stress on the primary side's switches, automatically balances the current distribution between the phases and enhances the power processing capabilities...
An internal paralleled active neutral point clamped converter (IP-ANPC) is presented in this paper. Advantages of the IP-ANPC converter include modularity, reliability and efficiency improvement, capability of interleaving, and better utilization of wide band-gap (WBG) devices. To simplify the operation of the IP-ANPC converter and provide an easy interleaving solution, a logic-based flying capacitor...
Due to the increase of electrical power transferred in various fields, the multilevel voltage-source-inverters (VSI) gained high popularity during the last decade. Their ability to produce low harmonic distortion waveforms and reduced power losses led to the development of a large number of solutions and control methods. This paper presents some five-level (5L) VSI topologies with their main features...
A simple and low cost quasi resonant LED driver is proposed. Prominent merits of the proposed topology are low line current distortion and reduced switch voltage stress. This paper presents the principle of operation of the proposed circuit, analysis of average power and switch voltage and current stress. Theoretical predictions are supported by simulation and experiment.
Microinverter is attracting more attention due to its compact size, plug and play concept, easy installation, and higher power yield under partial shading condition. This paper explores a converter for the DC-DC stage of a non-isolated microinverter. The topology termed as extended-duty-ratio (EDR) boost, is a hybrid of the interleaved boost and switched capacitor concept which has the advantage of...
In the conventional buck converter the supply current is discontinuous which may produce electromagnetic interference (EMI). In order to minimize the EMI problems an interleaved buck converter with continuous supply current has been introduced. Also due to the advantage of improved step-down conversion ratio, the interleaved buck converter can be used for high step-down and high frequency applications...
This paper presents a multilevel step-up DC/DC converter for medium-voltage DC applications. The main features of the proposed multilevel converter are as follows: 1) the voltage stress of the power devices can be lowered, making it suitable for high-voltage applications; 2) the boost inductor can be significantly reduced which leads to the outstanding dynamic performance; and 3) it can reach a high-voltage...
Converter efficiency is vital point in PoE system, as the PSE provided power is limited by IEEE 802.3af/at standard. Besides, the existent power loss through the Ethernet wires and PD interface added another level on the requirement to enhance the solution efficiency. This paper proposes a new topology that meets the IEEE 802.3af/at-compliant powered device (PD) solution for Power over Ethernet (PoE)...
Multi-phase multi-level converter is an optimal alternative for high input and high power system. The voltage stress on the primary switch is only one-nth of the input voltage due to its multi-level structure. The current rating of power devices can be reduced by the multi-phase structure. To achieve soft-switching and improve efficiency, the resonant tank can be introduced to optimize the performance...
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