The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
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 focuses on the design and implementation of a digital closed-loop control scheme to maintain the 180° phase shift of an interleaved Boundary-Conduction-Mode (BCM) boost converter. The closed-loop control scheme operates by differentially modulating the on-time of each phase to adjust the phase-shift. Zero-Current-Detection (ZCD) circuits control the turn-on instant for the MOSFET of each...
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...
Traditional half bridge dual buck inverter (DBI) has a low power density due to the employing of two large input capacitances and two discrete output inductors. Magnetic integration is an effective method to enhance power density. However, unexpected circulating current may be induced by adopting conventional magnetic integration scheme. This paper proposes a novel magnetic integrated DBI inverter,...
One of the main challenges in power converters for photovoltaic (PV) energy conversion is their efficiency. In this sense, discontinuous conduction mode (DCM) is able to improve efficiency, mainly due to zero current commutation and the reduction of the reverse recovery losses. Furthermore, interleaved DCM power converters are able to extend this operating mode to higher power applications, due to...
In this paper a non-isolating high voltage (800 V) bidirectional DCDC-converter with a so far unreached efficiency of up to 99.7 % is built and tested in detail. In order to reach this goal, a SiC-MOSFET half bridge is switched at its technical maximum switching speed (200 V/ns) using an extremely low inductive switching cell. This fast and low loss switching cell is attached to a large and highly...
SiC power devices offer a good chance to improve performance of impedance source converters; however, new challenges must be met. This paper presents a study on phenomena occurring due to parasitic capacitances of inductors in a high-frequency quasi-Z-source inverter. Rapid changes of voltage values caused by new, fast-switching SiC MOSFETs and Schottky diodes make this issue important. Negative influence...
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...
This paper proposes a novel pulse-width-amplitude-modulation (PWAM) method for three-phase quasi-Z source inverter system in motor drive application. It is demonstrated that it operates at only 1/3 switching frequency of traditional PWM methods, with less harmonic distortion. As a result, switching actions and losses are also reduced significantly. With the proposed modulation, the required capacitance...
This paper proposes a wireless power transfer system with Class E inverter and half-bridge Class DE rectifier. The proposed system consists of a Class E inverter, a half-bridge Class DE rectifier, and a loosely coupling transformer. Both the inverter and the rectifier achieve zero-voltage switching (ZVS) and zero-voltage derivative switching (ZVDS) at an optimum coupling coefficient. Therefore the...
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...
Wireless microsensors can sense and share data that can save lives, energy, and money. Recharging or replacing thousands of tiny, easily exhaustible batteries, however, is too costly. Fortunately, photovoltaic (PV) cells can generate 100x more power from sunlight than other transducers can from motion, heat, or radiation. But since PV cells cannot supply the milliwatts that microsystems can at times...
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...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.