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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,...
This paper presents a multilevel modular step-down DC-DC switched-capacitor converter that utilizes soft switching resonant operation. Previous versions of traditional multilevel modular switched-capacitor dc-dc converters (MMSCC) have a low switching device voltage rating. Moreover, capacitor voltage stress increases proportionally as the voltage conversion ratio increments. Significant advantage...
This paper proposes a current-source parallel resonant Class E inverter with low peak switch current. The proposed circuit consists of two switches, a parallel resonant circuit, a capacitor, an inductor, a choke inductor, and a DC voltage source. The peak current flowing through the switches is no more than the input current, which reduces the current stress of the switching devices. Zero-voltage...
Bulky capacitors are usually needed to buffer the double-frequency ripple power (DFRP) in single-phase power factor correction (PFC) rectifier. It is important to reduce the capacitance requirements for improving the system reliability and power density. In this paper a control method for capacitive idling converter based PFC (CIC-PFC) rectifier is proposed. The DFPR is diverted to the energy transfer...
We evaluate the flying capacitor multilevel converter (FCMC) with one switched-capacitor cell under asymmetric working condition, as a highly efficient hardware realization for the virtual infinite capacitor (VIC). The VIC is a type of electronic circuit, recently introduced to replace large, expensive and unreliable electrolytic capacitors, mainly intended for smoothing random fluctuations of a DC...
Single-phase two-stage inverters generally use an intermediate capacitor to buffer the power imbalance between DC input and AC output. However, the resultant low-frequency voltage ripple on this intermediate capacitor may produce low-frequency ripple at the source side, especially when the front-end dc/dc converter operates in continuous conduction mode (CCM). Some common solutions to reducing this...
Flying capacitor multilevel (FCML) converters are known to naturally balance the capacitor voltages through the use of phase-shifted pulse-width modulation. However, in practice, the capacitor voltages can still deviate and active balancing is often required. This work investigates the origins of the voltage imbalance in practical implementations of such converters and presents corresponding solutions...
Resonant switched capacitor dc-dc converter designs are commonly optimized based on flying capacitance constraints. However, for an actual circuit design, the total available capacitance is further constrained by the need for bypass capacitance at the input and output nodes. This work finds expressions for the voltage ripple and develops a method to optimize the allocation of bypass capacitance so...
A transformerless high step-down DC-DC converter is presented in this paper. The voltage-divider and switched-inductor techniques are employed to achieve high step-down voltage gain for the proposed converter. For the voltage divider, two capacitors with same capacitance are connected to the DC source. For the switched inductor, two inductors with same inductance are in series at the switch ON-period...
This paper reports on the implementation of a transcutaneous capacitive wireless power transfer (C-WPT) strategy for biomedical implants. The approach is based upon a series resonant converter in which the tank capacitors are replaced with a capacitive link comprising two pairs of coated parallel plates aligned around the tissue as the dielectric material. Miniaturized printed-circuit boards are developed...
Micro-electro-mechanical frameworks (MEMS) Technology has risen as a key methodology for building low-misfortune stage shifters, which is crucial for cutting edge radar and correspondence frameworks. This MEMS innovation is utilized as a part of stage shifters, which are vital for advanced telecom, car, and protection applications. The principle idea here is to evacuate every single existent capacitance...
The advent of Silicon-Carbide and Gallium-Nitride MOSFETs offers potential to realize higher energy density power converters operating at increased switching frequencies. The maximum switching frequency in a power converter is limited by the ability of the switching device package to dissipate its switching and conduction losses. At a given value of drain-source voltage and current, the turn-on losses...
Bidirectional flyback dc-dc converters are widely used for low power capacitive load charging. The performance of such converters are highly dependent on device parasitics which are mostly capacitive in nature. Implementation of soft switching methods like first resonant valley mode switching exploit their presence to minimize the device stress and loss. However in the process, these parasitic capacitances...
Driver circuits for inductively coupled systems such as wireless charging and RFID are more efficient if a high Q factor can be achieved but this requires tuning to compensate for component tolerances and environmental influences. Any tuning system used must be able to handle potentially large voltages at resonance as well as achieving precise tuning. In this paper, we describe the use of a low loss...
This paper suggests a current-fed double inductor push-pull converter for the use as a preamplifier stage of a constant current charger for HV capacitors. With this converter it is possible to offer a wide input voltage range for the use in mobile applications with a 24 V or a 48 V battery. A novel snubber technique for current-fed converters is introduced, so that transistor conduction losses can...
Compact high step-up DC/DC conversion to provide high DC voltage has numerous applications. A conventional boost converter has many limitations with regard to achieving high voltage gain with high power density and efficiency. The flying-capacitor multilevel (FCML) converter topology has many inherent advantages to overcome many of the limitations of the conventional boost converter. In this work,...
This paper proposes to utilize the internal solar cell diffusion capacitance and internal solar module wire parasitic inductances to replace the input capacitor and filter inductor in boost derived DC-DC converters for energy harvesting applications. High switching frequency (MHz) hard switched and resonant boost converters are proposed. Analysis, simulation and experimental prototypes are presented...
High power, high repetition rate capacitor charging circuit is presented. The circuit uses four SiC MOSFET switches in parallel in a modified boost converter configuration. Switching losses, already reduced due to the fast switching characteristics of the SiC devices are further mitigated by an auxiliary switch enforcing zero voltage turn-on of the main switches. The charging circuit is expected to...
In this paper, an average current mode controlled DC/DC boost converter is designed for automotive industry applications. The detailed steady-state mathematical modeling and small-signal analysis are carried out. Here, the aim is to design an average current mode controlled DC/DC boost converter having soft switching capability i.e. during start-up the output voltage should gracefully increase and...
This work investigates power losses in conventional and multi-level buck converters. Conduction and switching losses are modeled for conventional, 3-level and 5-level buck converters as a function of technology parameters, design variables and the operating point. It is shown that for a given set of technology parameters and optimized design variables, multi-level buck converters achieve higher efficiencies...
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