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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,...
A delta-structured switched-capacitor equalizer (DSSCE) is proposed to achieve the automatic any-cells-to-any-cells (AC2AC) balancing for a long battery string, leading to the fast-speed and high-efficiency balancing. Only two switches are required for each battery cell, and one capacitor is set for any two cells, materializing the delta-structured switched capacitors (SC). All MOSFETs are triggered...
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...
Multi-megawatt scale isolated DC-DC converters are likely to become increasingly popular as means to interconnect the MVDC grids of different voltage levels. Three-phase dual active bridge DC-DC (3DAB) converters operating with the zero-voltage switching (ZVS) is a promising candidate for the target multi-megawatt application. This paper presents a systematic approach of the design considerations...
The ability to provide accurate, rapid and dynamically-controlled impedance matching offers significant advantages to a wide range of present and emerging radio-frequency (RF) power applications. This work develops a new type of tunable impedance matching networks (TMN) that enables a combination of much faster and more accurate impedance matching than is available with conventional techniques. This...
High-voltage and high-current power converters are essential in numerous applications, including shipboard power systems and industrial motor drives. Most of the existing topologies are based on dc-link converters, and use dc-dc or dc-ac power cells to realize a multilevel power converter. Therefore, they require a large number of capacitors with high capacitances. This paper proposes a new modular...
In single-phase photovoltaic (PV) systems, power mismatching between input and output terminal leads to power pulsation, seriously affecting maximum power point tracking (MPPT). Paralleling an electrolytic capacitor (e-cap) across PV panel to smooth power pulsation seems to be an unreliable method owing to its short lifetime. Various power decoupling methods used in micro-inverters have been proposed...
Capacitive DC links provide the only low-impedance current path connected with an input source during the start-up of many voltage source converters. A soft-start circuit is usually implemented to limit the inrush current. A two-terminal active capacitor is recently proposed which can directly replace conventional passive capacitors in DC links, with reduced cost or size for a given application. The...
Hybrid DC circuit breakers have the advantages of fast fault current interruption with the solid-state semiconductor devices and low conducting loss with the mechanical switches. Therefore it is suitable to be used in the multi-terminal DC transmission system. The objective of this paper is to determine a voltage sharing between the mechanical switch and the IGBTs in a proposed topology of hybrid...
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...
This paper presents a clock-feedthrough compensation technique for bootstrapped switches. The proposed technique utilizes a dummy transistor to generate a reverse voltage, which compensates the input-dependent error caused by clock feedthrough effect of sampling switch. Simulation result shows the differential sampling error of bootstrapped switch reduces from 7.2mV to 1.4mV for the worst case, operating...
Paper deals with analysis and modeling of a new type of single-phase supplied single leg LC matrix converter (SLLC MxC) with two phase outputs. Its schematic arrangement consists of one-leg half-bridge matrix converter, network with a neutral point, LC filters, switched capacitor and passive or active load. As the harmonic analysis of the voltage of both phases gives a very high value of total harmonic...
Energy storage cells have been widely used in many applications. Depending on the application, energy storage cells are connected in series to match the voltage requirement. Each the energy storage cell has individual differences such as internal impedance and self-discharging, which cause cell voltage imbalance. This paper proposes a switched capacitor voltage equalizer. The proposed equalizer combines...
An investigation of the voltage imbalance of the two capacitors of the semi-full-bridge submodule is performed. Since the capacitances are not exactly the same, there may be a difference between the capacitor voltages. The resulting current-spike when they are connected in parallel has been analyzed in a full-scale laboratory experiment.
Reference drivers for charge-redistribution SAR ADCs require significant area and/or power. In this work, a low-power and area-efficient passive reference-voltage driving scheme for charge-redistribution SAR ADCs is proposed. An on-chip decoupling capacitor is pre-charged to a reference voltage during tracking phase and utilized to drive the DAC passively during conversion. The reference-voltage drops...
This paper investigates the switching performances of two state-of-the-art half-bridge SiC MOSFET modules using a standard double pulse test methodology. A deliberate choice of the modules with the same voltage and current ratings, the same packaging, but different stray inductances and capacitances is made in order to give an insight into the influence of parasitics in the switching transients and...
A silicon carbide (SiC) vertical field effect transistor (VJFET) with ultra-low feedback capacitance Crss has been developed, which is called as screen grid VJFET (SG-VJFET). The SG-VJFET is a very promising power device because of the superior static characteristics such as normally off, low on-resistance, and high breakdown voltage, furthermore, issueless in terms of gate oxide reliability and long-term...
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...
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