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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...
This paper presents a flyback converter based partial power processing structure for battery energy storage system (BESS). It combines both of the battery balancing functionality and power stage regulation functionality into one system. The proposed BESS only have one control variable which is the common duty cycle for all the flyback converters. It is used for the voltage or current regulation. There...
In this paper different gate drive concepts to eliminate parasitic turn-on for SiC MOSFETs are discussed. Experimental results show a potential for lowering switching losses of SiC MOSFETs during fast switching operation, reduction of turn-off overvoltage across the bodydiode. Finally increased requirement on the gate drive unit are discussed.
Ordinary single phase inverter gives a square wave output which when applied to electrical appliances may damage the later, reduce its efficiency as well as life as this inverter output waveform is not sinusoidal and contains lower and higher order harmonics in addition to fundamental. Moreover, the output voltage cannot be controlled. In this paper a single phase half bridge inverter is discussed...
Power factor and harmonics are primary factors in electrical distribution network. Harmonics are generated by the non-linear and irregular loads at end users. High harmonics in devices draws the large amount of current which results in poor power factor. Hysteresis control technique is one of the techniques in power factor converter topologies. Switching losses, low power factor and high harmonic...
The elimination of electromagnetic emissions (EME) in switch mode power supplies (SMPS) has high importance especially in automotive applications. External filters, spread spectrum techniques and the output driver circuits are the main methods to influence the switching behaviour of SMPS. This paper presents the concept of an output driver with adaptive current source control for high frequency SMPS...
A direct drive of a buck converter is proposed in this paper. It is achieved by delta-sigma modulation at 13.56-MHz sampling without digital PWM. The high-speed gate driver, which is based on GaN-HEMTs push-pull configuration, is employed to drive a SiC power MOSFET at high switching frequency. By delta-sigma modulation at 13.56-MHz sampling, the output voltage of buck converter is directly controlled...
Inside the meshed LVDC distribution grids the power flow is predominantly limited by the line impedances. In order to achieve economical and flexible operation of the meshed LVDC distribution grids, it is required to control the power flow. For that end, the line impedances need to be adjustable. The line impedance can be controlled by a DC-DC transformer, however, it needs to be rated for the full...
This article aims to develop the control circuit of a single-phase inverter following our previous studies on the MPPT control and photovoltaic systems, this inverter produces a pure sine wave with an output voltage that has the same amplitude and frequency as Network voltage. A microcontroller, based on advanced technology to generate a sinusoid with fewer harmonics, less cost and a simpler design...
The Non-Conventional sources such as solar energy has been replacement and best exploited electric source. The solar electric power required DC-DC converter for production, controllable and regulation of variable solar electric energy. The single ended boost converter has been replaced by SEPIC converter to overcome the problem associated with DC-DC converter. The problem associated with DC converter...
This paper aims at design and implementation of light weight, smaller size, highly efficient and reliable single output DC-DC converter for defence application. To achieve miniaturization of the converter high switching frequency is selected, which in turn reduces the mass, size of magnetic and output filter components‥ To overcome the limitation of 50% duty cycle in auxiliary winding reset forward...
This paper complies design and development of hybridized Point of Load (POL) converter for distributed load power system. In this proposed converter, LM2743 — synchronous buck controller IC is employed, to achieve high efficiency for low voltage, high current applications. The LM2743 IC has output under and over voltage detection circuit, in-built bootstrap circuit and shutdown features. The proposed...
Although switched-mode Electronic Loads (E-Loads) are commonly used in different applications, they are facing particular limitations especially for higher frequency purposes. While increasing the switching frequency in switched-mode E-Loads enables them to operate at high frequencies, simply rising the switching frequency might not be an efficient approach in terms of design issues, device limitations,...
This paper presents a wide load range all-digital single-inductor multiple-output (SIMO) DC-DC buck converter. Since sensor nodes for the Internet of Things (IoT) operate mostly in a standby mode and occasionally in an active mode, a SIMO DC-DC converter supporting a wide load range with practical conversion efficiency is required. In order to achieve practical efficiency in a wide load range, three...
This paper aims to design and development of hybridized Point of Load (POL) converter for distributed load power system. In this proposed converter, LM2743 — synchronous buck controller IC is employed, to achieve high efficiency for low voltage, high current applications. The LM2743 IC has output under and over voltage detection circuit, in-built bootstrap circuit and shutdown features. The proposed...
Solid-State Power Controller (SSPC) is a key device in the advanced aircraft power distribution system. It replaces the traditional electromechanical circuit breakers, contactors and relays to switch loads on/off and provides comprehensive protection functions. The large surge current, which results from the starting of large capacitive loads, is similar to the short-circuit fault, so it may mislead...
Integrated gate-drivers for power MOSFETs require multiple supply voltages biasing internal circuitry or providing a high voltage ground to the high-side driver. This paper proposes a novel DC-DC converter architecture fulfilling these demands of modern gate-driver ASICs while increasing system efficiency. In the proposed concept a conventional single inductor DC-DC converter generating a low voltage...
This work targets a novel self-powered Smart Circuit Breaker (SCB) for monitoring and controlling power in emerging small-scale AC nano-grids. The SCB concept is intended as a direct replacement of standard(120 Vac, 15 Arms) household circuit breakers, which imposes several challenging constraints. The SCB must therefore generate its own internal supply from the small AC voltage drop across the main...
Nowadays, The demand for portable devices players has grown significantly and mobile applications become increasingly complex and multi-function. Research aims to increase the autonomy of portable devices by acting on several factors, one of the most discussed areas is to increase the efficiency of voltage converters in order to reduce consumption. In this context, DC / DC converters are used in portables...
A 1200 V SiC MOSFET switches at much faster rate compared to a Si IGBT. As a consequence, SiC MOSFET experiences comparatively more ringing in device voltage and current due to the presence of parasitic inductance in the converter layout. Therefore, it is not straightforward to retrofit SiC MOSFETs in the converter layout of IGBTs where parasitic inductance appears in the range of 100 nH to 300 nH...
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