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The rapid growth of the optical communication field, as well as the eventual emergence of fiber-to-the home networks, creates a need for low-cost, but high performance optical devices. Increasing demand for more network capacity, driven by the phenomenal growth of the Internet, provides a great challenge for telecommunication network providers. Since demand is not uniform throughout the network, a...
This paper presents an Adaptive Multi-Phase Converter (AMPC) used as a perfect matching stage to improve the global energy production and conversion efficiency of a photovoltaic power conversion system. A control law was specially developed to guarantee high conversion efficiency, even in presence of a constantly changing operating point, which is the main constraint in a traditional photovoltaic...
In this paper, a control method for autonomous changing the number of parallel driven DC-DC converter is proposed. In order to improve efficiency of the parallel driving, the number of parallel driven converters is dynamically changed for the variations of output power. Taking into account the implementation requirements, the chosen platform was an Field-Programmable Gate Array (FPGA). This paper...
This paper introduces an analysis and design of a digital controlled double loop voltage-current for a buck converter. Taking into account the implementation requirements, the chosen platform was an Field-Programmable Gate Array (FPGA). This paper also shows in detail the analog-digital interface. The study is completed by a detailed analysis of the FPGA programming including states machines and logic...
Photovoltaic energy is a wide kind of green energy. A high performance on these systems is needed to make the most of energy produced by solar cells. Also, there must be a constant adaptation due to the continuous variation of power production. Control techniques for Power Converters like the MPPT algorithm (Maximum Power Point Tracking) present very good results on photovoltaic chains. Nevertheless,...
In this paper a novel distributed photovoltaic power architecture using advanced lithium-ion batteries is proposed, which is mainly composed of a switched mode power converter and a power management system. This system exhibits the advantages of better protection and more efficient control on charge/discharge of the battery than the traditional photovoltaic power system. Furthermore, better use of...
Embedded microprocessors require efficient supply management systems to optimize its power consumption and to enhance their calculation potentials. Typically, the modules performing this function are known as Voltage Regulator Modules (VRMs). It is widely adapted that current-programmed regulation techniques own leveraging skills in the control of this kind of power converters. However, these strategies...
The presented work studies various effects in the input-current waveform in switched Voltage Regulator converters. As a first step, the input current has been mathematically characterized. This description is called up to find the relationship among the number of phases of the power converter, its duty cycle and its harmonic content. The following conclusion associated to the last model, is the optimal...
In the context of photovoltaic (PV) research, the use of a storage function in such intermittent power supply systems is crucial in order to get better adequacy between the peaks of energetic consumption and production. On the one hand, a research algorithm of the optimal power to charge and discharge advanced batteries for photovoltaic application is necessary to obtain an optimum electronic management...
Digital predictive techniques are nowadays an attractive option for current-mode controlled voltage regulator modules. This article examines the implementation of two digital predictive control laws and their application in a typical case for this kind of loads. The simulation results presented in this paper illustrate the pros and contras of both techniques.
European efficiency definition demonstrates that photovoltaic generators operate in average between 30% and 100% of its rated power 80% of its working time. Nowadays, converters are designed with a maximal efficiency working point, but often, this point does not fit with the correct power range. This paper presents a structure with a parallel connection of n converters to obtain higher conversion...
This paper presents a new design of dc-dc converter with MPPT (Maximum Power Point Tracking) for applications using pm-SiH/muc-Si:H solar cells. The aim of our new design architecture is not to manage a global photovoltaic panel but manage many independent groups of photovoltaic cells. The distributed architecture will allow an optimization of the power management of each channel characteristic dependant...
In this paper, the parallel connection of two power semigyrators of type G with controlled input current is used as an adaptation stage to improve the efficiency and reliability of a photovoltaic power conversion chain. A current sharing control has been incorporated in the system for guarantee the uniform distribution of the total peak power among the dc-dc converters. We use a democratic current...
This paper is focused on the design of a test-bank to develop high-frequency digital control laws for point-of-load converters. As a result, a high-frequency digital DC/DC converter prototype has been completed using a Freescalepsilas DSC as digital controller. During this exposition, we present the design guidelines to build this test-bank and how to adapt some state-of-the-art digital control laws...
This paper presents a parallel connection of three-cell interleaved boost converters used as an adaptation stage dedicated to photovoltaic applications. Indeed, this structure associated to a MPPT control improves the efficiency and reliability of a photovoltaic power conversion chain. An additional current sharing control has been incorporated to assure a uniform distribution of power between each...
A large part of photovoltaic research is dedicated to developing innovative integration technology for the module. Now the use of a storage function in such intermittent power supply systems is crucial in order to get better adequacy between the peaks of energetic consumption and production. The integration degree of photovoltaic systems will be improved if all the components: panel, battery, converters,...
Today, advances in the technology of power systems integration allow new multiple functions in power conversion. However, performances are not improved enough to have today a complete DC-DC converter integrated on a same chip. This study proposes a comparison between different DC-DC converter topologies to deduce the most adapted for a future complete integrated circuit version. For this type of circuit,...
This work proposes a new modeling approach for spiral inductive components which is based on the partial element equivalent circuit (PEEC) method extended to rotational symmetry case. In this context, analytic approximations of all integral formulas are proposed in order to reduce computing time for simulations of the partial inductance and capacitance coefficients with satisfying accuracy. Globally,...
This paper studies several solutions to choose the most appropriated number of phases for a high- current low-voltage interleaved voltage regulator module (VRM). Several criteria have been considered as transient responses, harmonic contents (EMI levels) or converter efficiency to find the optimal topology of the converter. A theoretical comparison between classical single-phase converters with those...
Inductor current tracking in high-frequency DC/DC converters is not effortless, especially when high current and low voltages loads are demanded. This paper proposes a simple technique to obtain a good resolution in the inductor current measurement obtaining an equivalent voltage image which can be used for a high-frequency PWM controller. This strategy of measurements is generic and it has been validated...
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