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Showing 1 to 20 of 25 for “"Discontinuous Conduction Mode"”.
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Analysis of boost converter in continuous conduction mode and discontinuous conduction mode
… discusses a boost converter using continuous conduction mode and discontinuous conduction mode. The first part of the thesis analyzes a boost converter using continuous conduction mode with voltage mode control. A switch network which eases the analysis of the boost converter is modeled. …
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Improvements in integrated high-quality rectifier-regulators
… voltage is due to the integration of a discontinuous conduction mode boost converter and a continuous conduction mode dc-dc converter. In addition, this power factor correction technique suffers from a high-voltage spike on the switch at turn-off. In this thesis, variable frequency …
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A new small-signal model for current-mode control
A new small-signal model is developed for pulse-width-modulated converters operating with current-mode control. Four different control schemes are analyzed, all of which use the instantaneous value of the inductor current as part of the control modulation. Continuous-conduction mode and …
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A single stage power factor corrected AC/DC converter
… inherently forces the input current to be discontinuous and ac modulated to achieve high input power factor. The converter's output is operated in discontinuous conduction mode to minimize the bulk capacitor's voltage variations with variations in the output load current. Analysis of the …
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Energy Harvesting Circuit with Input Matching in Boundary Conduction Mode for Electromagnetic Generators
… Rather than operate a buck-boost converter in Discontinuous Conduction Mode (DCM) in other impedance matching cases, the proposed method is running the boost topology in Boundary Conduction Mode (BCM). So it would perform resistive input matching, while reducing the converter power loss. The …
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Energy Harvesting Circuit for Indoor Light based on the FOCV Method with an Adaptive Fraction Approach
… non-inverting buck-boost converter operating in discontinuous conduction mode (DCM) and constant on-time pulse skipping modulation (COT-PSM) to achieve voltage regulation and maximum power delivery to the load. Battery is used as secondary input also as secondary output to achieve a longer …
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Steady-State Time-Domain Analysis of LLCL Resonant Converter
… of a series resonant converter, frequency domain modelling (FDM) is usually sufficient due to the limited modes of operation. However, for a three or more element resonant tank, multiple modes of operation arises due to which FDM is restricted for analysis for operation below resonant frequency …
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High Efficiency SEPIC Converter For High Brightness Light Emitting Diodes (LEDs) System
… which is a modified SEPIC converter working in discontinuous conduction mode (DCM). Different with a conventional SEPIC converter, the middle capacitor is replaced with a valley-fill circuit. The valley-fill circuit could reduce the voltage stress of output diode and middle capacitor under the …
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Three-Phase Power Factor Correction Circuits for Low-Cost Distributed Power Systems
… computers and server applications. The use of discontinuous conduction mode (DCM) boost rectifiers is extensively explored to achieve simplicity, while reducing the cost for DPS applications. Interleaving of DCM boost rectifiers is also explored as an alternative approach to further reduce the …
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Operation and analysis of high-voltage-gain dc-dc converters with voltage multipliers
… stage, and this family has been studied in discontinuous conduction mode (DCM). The second family relies on a non-inverting or inverting diode-capacitors voltage multiplier stage and has been proposed in both continuous conduction mode (CCM) and DCM. The third family depends on bi-fold …
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Stacked-Switched Electrolytic Capacitor-less AC/DC Power Converters
… to reduce voltage stress and operating in Discontinuous Conduction Mode (DCM) to achieve inherent power factor correction. Closed-loop control based on Variable Frequency Modulation (VFM) is used for voltage regulation, and a secondary-side duty modulation strategy minimizes low-frequency …
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A Two-Mode Synchronous Buck Converter for Low-Power Devices with the Sleep Mode
… most time of the smart camera works in the sleep mode. Hence the light load efficiency is important in this application, however, conventional buck converter usually have high efficiency at heavy load but poor efficiency at light load. To increase the light load efficiency of buck converter, this …
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Low-power Power Management Circuit Design for Small Scale Energy Harvesting Using Piezoelectric Cantilevers
… of the circuit including: (i) use of a discontinuous conduction mode (DCM) flyback converter, (ii) constant on-time modulation, and (iii) control of the clock frequency of a microcontroller unit (MCU). The DCM flyback converter behaves as a lossless resistor to match the source impedance …
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Modellistica e progettazione di convertitori elettronici di potenza DC-DC
The present PhD dissertation deals with average modeling, design and experimental verification of power electronic converters. This takes the DC-DC Boost converter as a reference, together with some converter topologies derived from it, such as the interleaved PFC Boost converter. More …
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Power Converter Design for Maximum Power Transfer and Battery Management for Vibration-Based Energy Harvesting on Commercial Railcars
… by automatically switching between control modes. The proposed converter design uses an inverting buck-boost converter operating in discontinuous conduction mode to maintain a constant input impedance through a fixed duty cycle. This constant input impedance mode is used to extract maximum …
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Βέλτιστος σχεδιασμός του αντιστροφέα ρεύματος Flyback για εφαρμογή του σε φωτοβολταϊκά πλαίσια εναλλασσόμενου ρεύματος
… να λειτουργεί στην περιοχή της ασυνεχούς αγωγής (Discontinuous Conduction Mode, DCM). Στη συνέχεια προτείνεται μία δεύτερη τεχνική ελέγχου η οποία, αφ' ενός μεν αναγκάζει το μετατροπέα να λειτουργεί στο όριο συνεχούς και ασυνεχούς αγωγής (Boundary between Continuous and Discontinuous Conduction …
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A Two-mode Buck Converter toward High Efficiency for the Entire Load Range for Low Power Applications
… cameras. The proposed converter employs two modes, a baby-buck mode and a heavy-load mode, in which each mode is optimized for its respective load range to achieve high efficiency throughout entire range. The heavy-load mode converter adopts the conventional synchronous buck approach, as it …
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Maximizing efficiency of solar energy harvesting systems supplying a microgrid using an embedded system
… using an embedded system. For this purpose, the model of the PV panel is first studied in accordance with the real behavior of the PV panel. The single diode model of the PV panel is first developed in Matlab environment to obtain an excellent correspondence to manufacturer’s published curves and …
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On the Circuit Oriented Average Large Signal Modeling of Power Converters and its Applications
… efficient Circuit Oriented Large Signal Average Models (COLSAMs) that approximate the slow dynamics manifold of the moving average values of the relevant state variables for Pulse-Width Modulated (PWM) dc to dc and three-phase to dc power converters is developed. These COLSAMs can cover …
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A Constant ON-Time 3-Level Buck Converter for Low Power Applications
Smart cameras operate mostly in sleep mode, which is light load for power supplies. Typical buck converter applications have low efficiency under the light load condition, primarily from their power stage and control being optimized for heavy load. The battery life of a smart camera can be extended …
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