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The use of series-resonant converters (SRC) in light emitting diodes (LEDs) drivers has increased due to its simplicity and high efficiency. Furthermore, the use of SRC provides a reduction of the low frequency (LF) ripple in the LEDs' current, originated by the voltage ripple in the output of the power factor correction (PFC) stage (bus voltage ripple). Thus, the attenuation of the ripple transmission...
This paper presents a three-phase switched capacitor converter to drive power light-emitting diodes (LEDs). The proposed converter does not utilize electrolytic capacitors, providing a high useful lifetime. In addition, the converter does not have diode bridge input rectifier, which can increase the converter efficiency. Moreover, it can stabilize the output current in open loop control, without needing...
This paper presents the analysis and design of a self-oscillating electronic ballast with universal input voltage range (100–240 VRMS) and power factor correction to supply a T8 32 W fluorescent lamp. The power factor correction stage consists of a DC-DC converter operating in discontinuous conduction mode. The lamp is supplied by a half-bridge resonant inverter and a self-oscillating command circuit...
In this paper a Predictive Current Control strategy is proposed for constant switching frequency operation and verified with a neutral-point-clamped (NPC) converter for load current regulation and DC-link capacitor voltages balancing. The aim of this control technique is to obtain a modulated waveform at the output of the converter, whilst maintaining all the desired characteristics of FCS-MPC. The...
This paper proposes a DC-DC step-up converter with a switched capacitor to power light-emitting diodes (LEDs), which may be applied to an autonomous system, e.g. PV system. In the converter is used a small additional inductor operating in discontinuous conduction mode (DCM) which allows zero current switching (ZCS), reducing circuit losses. Moreover, the LED current can be stabilized through the switching...
This paper presents a family of integrated insulated converter to feed power light emitting diodes (LEDs) for street lighting system applications. A Buck, Boost and Buck-Boost converters were used to implement the power factor correction (PFC) and a Flyback converter to perform the power control (PC). The integration between the power stages was made to increase the system reliability by reducing...
This study deals with a control system for voltage regulation of stand-alone generation systems based on self-excited induction generators (SEIG). It is considered a four-wire hybrid topology composed by switchable capacitor banks and distribution static compensator (DSTATCOM). While the switchable capacitor banks supply the most part of the reactive power for voltage regulation, the DSTATCOM is controlled...
This paper proposes a simplified control strategy to balance dc-link capacitor voltage for multi-level diode clamped voltage source inverter (DCVSI) based on discontinuous space vector pulse width modulation (DSVPWM). Currents flowing into the neutral point of dc-link capacitors cause fluctuations of dc-link capacitor voltages in the diode-clamped inverter. Performance of the multi-level inverter...
In this paper, an improved analytical model suitable for a high voltage Gallium Nitride high electron mobility transistor (GaN HEMT) in cascode configuration is presented to analyze operating condition and calculate the energy losses during turn-on transition. Aiming to guarantee the superior precision of the model, all the parasitic inductors and capacitors are taken into consideration during the...
Split-Type Air Conditioners (ACs) are extensively used in households, commercial organizations and industrial setups. The duty-cycle based hysteretic control is inefficient and requires high power provisioning of full startup current for the compressor at each turn-on. This is especially demanding in constrained power systems with weak grids where people are dependent on backup generators and UPS...
In order to capture real-time characteristics of ultracapacitors (UCs), especially for electric transportation applications, they need to be modeled dynamically. Dynamic models provide accurate estimation of UC charge/discharge responses to varied inputs. Dynamic models are useful in predicting the behavior of UCs under varied load conditions. Also, it is critical to build an accurate UC model, which...
In this paper, authors propose an advanced photovoltaic system based on the 15-Level PUC inverter. The proposed inverter has the advantage to operate with a single PV array while generating fifteen voltage levels. Even it is constituted from only eight switches and two capacitors; it can nevertheless offer a fifteen-level output voltage. In order to extract the maximum power from the PV panel, authors...
This paper deals with a control system for voltage regulation in stand-alone generation systems based on self-excited induction generators (SEIG). It is considered a three-wire hybrid topology composed by switchable capacitor banks and distribution static compensator (DSTATCOM). While the switchable capacitor banks supply the most part of the reactive power for voltage regulation, the DSTATCOM is...
This paper proposes an analysis of a high step-up DC/DC converter named Integrated Quadratic-Boost-Zeta converter. It is based on the combination of two well-known DC/DC converter circuits, the Isolated Zeta converter and the Quadratic-Boost converter. The aim of this paper is to analyze the voltage static gain, the voltage and current stresses on the components of the converter as well as its main...
This paper presents the theoretical analysis and experimental results from a three-phase SEPIC-type rectifier operating in discontinuous conduction mode (DCM). The rectifier is suitable for applications in the electronic energy processing of small wind energy conversion systems based on permanent magnetic synchronous generators. The rectifier is capable of providing high power factor without the use...
Nowadays distributed energy has been widely developed and applied in various fields, especially in DC micro-grids. However, for many reasons, such as the realization of high voltage and small ripple of output voltage on the DC-bus side in DC micro-grids, Energy Storage System (ESS) is faced with challenges and also opportunities. This paper proposes a novel cascaded modular topology applied to ESS...
In this paper, a complete analysis of the Zeta converter applied as a photovoltaic battery charger is carried out. The design methodology of the solar battery charger system, including the power circuit main devices and system controllers are presented in details. The solar battery charger includes an alternative Constant Current/Constant Voltage (CC/CV) charging method with inherent Perturb and Observe...
This paper proposes the use of voltage-doubling diode rectifier in the output stage of the zero-voltage-switching active-clamping current-fed half-bridge isolated DC-DC converter and presents a comparison with the classic diode full-bridge rectifier. The design methodology was revised to include the voltage-doubling rectifier and lower side clamp capacitor connection. Two converters (diode bridge...
In high power PWM inverters, the stability of the auxiliary power supplies makes great contribution to the reliability of the inverters. This paper deals with the EMI (Electromagnetic Interference) problem of the auxiliary power supplies which is caused by the high-frequency switching power electronic devices. Firstly the high-frequency models of the three phase inverter and the auxiliary power supplies...
The number of wind turbines connected to power grids have significantly increased during the last decade. This is mainly due to the convincing revolution in power electronic technology and the growing concern about greenhouse effect that is intensified due to the burning of fossil fuels. Variable-speed wind energy conversion systems (WECSs) such as doubly fed induction generators (DFIGs) are dominating...
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