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Partial shading on a photovoltaic (PV) module is known to trigger serious issues of significant reduction in power generation and occurrence of multiple power point maxima. Among various kinds of voltage equalizers that have been proposed to preclude the partial shading issues, switched capacitor converters (SCCs) are known as a simple and small solution. To achieve even smaller circuit at lower cost,...
Performance analysis and output voltage regulation of a cascaded step-up switched-capacitor converter (SCC) under zero voltage switching (ZVS) condition is analyzed in this paper. The ZVS condition (converter operation above its resonant frequency) provides 1) zero-voltage switching, which leads to a relatively higher efficiency compared to zero current switching (ZCS) under the resonant frequency...
Improving the power density of a power converter has many benefits for systems integration. Aspects such as thermal management, weight, conformation to mounting locations, and the footprint of the converter all become critical factors as systems continue to scale down in size. The flying-capacitor multilevel (FCML) converter topology is of interest because it has characteristics which contribute to...
A hybrid modulation approach is proposed in this work, which allows to modulate the switches of the five level neutral point clamped inverter (5LANPC) with different switching frequencies. Some of the switches are controlled with a low switching frequency using six-step modulation and Optimized Pulse Patterns (OPPs), whereas the rest are modulated with a high switching frequency using Carrier-Based...
This paper presents a complete design procedure for a motor drive aiming at maximizing nominal power within loss (30 W) and form factor (60 inch3) constraints. Particularly, this motor drive system has EMI requirement on both input and output sides and it should be free convection cooled. Loss-size Pareto fronts of multiple three-phase topologies including two-level voltage source converter (VSC),...
High frequency is an effective method to improve transmission efficiency of inductively coupled power transfer (ICPT) system. However, it is hard for the high capacity semiconductor device to meet the high frequency need. In this paper, a novel multiple-frequency inductively power transfer system is proposed. By adopting a novel multiple-frequency topology of inverter, the transfer frequency of the...
The modular multilevel converter (MMC) is considered to be the state of the art in medium- and high-voltage application. The nearest level modulation (NLM) method is one of the most popular modulations, however, when applied to MMC with small number of sub-modular (SM), the output waveforms contain large harmonic components. This paper proposes a modified NLM method. By changing the traditional rounding...
The Navy's Next Generation Integrated Power System (NGIPS) Technology Development Roadmap establishes Medium Voltage DC (MVDC) Integrated Power System (IPS) technology in future warships. This requires a higher medium voltage (MV)-rated power device, a semiconductor technology that enables compactness and light weight, and easily integrated into modular proven power conversion architectures. This...
The dc-dc conversion will play an important role in multi-terminal dc networks and dc grids. This paper presents two isolated resonant modular multilevel converters (IRMMCs) to fulfill the large step-ratio conversion for medium voltage dc (MVDC) networks. The conventional resonant modular multilevel converters (RMMCs) suffer the common problems of non-isolation and high current stress, which are solved...
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...
This paper explores methods to optimize and compare a variety of switched-capacitor (SC) DC-DC topologies that can be operated in a resonant mode. A figure of merit is developed that is a proxy for minimum achievable power loss, based on conduction and frequency-dependent losses in the active semiconductor components. Similar to past work on pure SC converters, the method leverages a charge-multiplier...
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...
The Flying Capacitor Converter (FCC) offers an attractive alternative to conventional 2-IeveI converter topologies due to the easily acquired high number of voltage levels and the increased effective switching frequency. However, balancing of the flying capacitor (FC) voltages is crucial in practice since a deviation from the nominal voltage levels increases harmonics in the output voltage and, more...
This paper presents a single phase converter topology that integrates a second harmonic energy buffer. The buffer is formed by converting one branch of the converter to use half-bridge cells, similar to an MMC type design. The energy buffer allows complete elimination of the 2nd harmonic ripple from the main DC bus and reduces overall DC link capacitor size. The topology also reduces the rms current...
This work presents a six phase Switched Capacitor (SC) DC — DC converter for photovoltaic Energy Harvesting designed in a 130 nm CMOS process for commercial motes application and Internet of Things (IoT). It tracks the Maximum Power Point (MPP) of a commercial 3 cm × 3 cm 60 mW poly-crystalline photoelectric panel through switching frequency modulation aiming battery recharge. Open-circuit voltage...
Five-level neutral point clamped H-bridge (NPCH) converter has been found practical application due to its low EMI and high output capacity. However, the unbalanced loss distribution of semiconductor devices in NPCH converter would limit the lifetime and the output capacity. In this paper, a five-level active neutral point clamped H-bridge (ANPCH) converter topology is studied, which is composed two...
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...
This paper proposes a new hybrid asymmetric multilevel inverter for generating the higher number of levels with reduced number of power semiconductor switches. The hybrid asymmetric multilevel inverter consists of full bridge inverter and reduced switch inverter topology. The reduced switch inverter topology can generate 13-level output voltage without utilizing full bridge inverter. When the full...
This paper discusses a network theory prospective of a power converter system used in consumer electronics devices (CED). As step-down buck converters are most widely used topology in this field of application, their operation is discussed in this paper. A power converter works as a system with power stage and controller working as a single unit. The power stage is designed to process power at higher...
The emerging Modular Multilevel Converter (MMC) is considered as one of the promising topologies for high power application. The balancing of the capacitor voltage of the MMC Submodules (SMs) plays a critical role for proper operation of MMC. At low switching frequency the balancing of capacitor voltages of MMC becomes a challenging task. This paper proposes a balancing approach based on space vector...
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