Michael A. E. Andersen
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View article: A Hybrid Control Scheme for a Single-Stage LED Driver With Inherent Power Factor Correction and Low Flicker
A Hybrid Control Scheme for a Single-Stage LED Driver With Inherent Power Factor Correction and Low Flicker Open
This article presents the design and implementation of a hybrid control scheme for a single-stage LED driver. The power stage comprises a class-DE resonant converter coupled with a charge-pump circuit that achieves inherent power factor co…
View article: A FEM Approach for Mitigating Magnetic Crosstalk for an Embedded Current Sensor
A FEM Approach for Mitigating Magnetic Crosstalk for an Embedded Current Sensor Open
Accurate measurements of the current sharing between parallel dies are essential when designing compact fast switching multichip power modules. A two-stage current sensor has been demonstrated which due to its embedded current transformers…
View article: A capacitive power transfer system with LCL primary compensation for very‐low‐power portable devices
A capacitive power transfer system with LCL primary compensation for very‐low‐power portable devices Open
This paper investigates and technically demonstrates a capacitive power transfer (CPT) system applicable to the charging of emerging very‐low‐power portable devices. The constant‐current operation of the primary LCL compensation in CPT is …
View article: Inductive Crosstalk Study of Embedded Current Sensor for SiC Die Current Measurement
Inductive Crosstalk Study of Embedded Current Sensor for SiC Die Current Measurement Open
Measuring the individual die currents in a multichip power module can aid in layout optimization, die selection, and testing of current balancing strategies during the design phase. Thus, a two-stage current sensor concept with an embedded…
View article: Design Automation Using Exclusion-Based Hierarchical Computation for Power Electronics Converters in Harsh Environments
Design Automation Using Exclusion-Based Hierarchical Computation for Power Electronics Converters in Harsh Environments Open
Designing power electronics converters for harsh environments is challenging due to the absence of components' performance under harsh conditions, the frequent transition and data-passing among various software, and the time-consuming and …
View article: Time-Based High-Pass, Low-Pass, Shelf, and Notch Filters
Time-Based High-Pass, Low-Pass, Shelf, and Notch Filters Open
This paper presents formulations for time-based first-order and second-order high-pass, shelf, and notch filters. These formulations are an extension to the existing literature where low-pass filters are already developed using a multiphas…
View article: Systematic Design of a Pseudodifferential VCO Using Monomial Fitting
Systematic Design of a Pseudodifferential VCO Using Monomial Fitting Open
Digital integrated electronics benefits from its higher abstraction level, allowing optimisation methods and automated workflows. However, analogue integrated circuit design is still predominantly done manually, leading to lengthy design c…
View article: Pentacentra Transformer for Multiphase LLC Converter in High-Current Data Center Application
Pentacentra Transformer for Multiphase LLC Converter in High-Current Data Center Application Open
The role of data centers has become significant in the era of information technology, and their operation consumes a substantial amount of energy. Therefore, the point-of-load (POL) converter or voltage regulation module (VRM) used in data…
View article: Modelling and Design for Position-Free Inductive Couplers with the Homogeneous-Flux Transmitting Coil in Wireless Power Transfer Systems
Modelling and Design for Position-Free Inductive Couplers with the Homogeneous-Flux Transmitting Coil in Wireless Power Transfer Systems Open
This paper presents a design algorithm to combine the analytical magnetic flux modelling and the genetic algorithm (GA) for position-free inductive couplers in inductive power transfer (IPT) systems. The design concept can enhance the posi…
View article: Modelling and Design for Position-Free Inductive Couplers with the Homogeneous-Flux Transmitting Coil in Wireless Power Transfer Systems
Modelling and Design for Position-Free Inductive Couplers with the Homogeneous-Flux Transmitting Coil in Wireless Power Transfer Systems Open
This paper presents a design algorithm to combine the analytical magnetic flux modelling and the genetic algorithm (GA) for position-free inductive couplers in inductive power transfer (IPT) systems. The design concept can enhance the posi…
View article: Hamilton: Flexible, Open Source $10 Wireless Sensor System for Energy Efficient Building Operation
Hamilton: Flexible, Open Source $10 Wireless Sensor System for Energy Efficient Building Operation Open
Sensors for improving building performance are rapidly populating the market, driven in part by the drive to reduce greenhouse gas emissions resulting from energy production as well as improve the interior environment for healthy and more …
View article: A Class-E-Based Resonant AC-DC Converter With Inherent PFC Capability
A Class-E-Based Resonant AC-DC Converter With Inherent PFC Capability Open
This paper investigates the use of the class-E inverter for power factor correction (PFC) applications. Analytical and state-space models are derived showing the class-E inverter’s capability of achieving inherent PFC operation with a cons…
View article: Creating Landscapes of Practice through Sequential Learning - A New Vision for PBL
Creating Landscapes of Practice through Sequential Learning - A New Vision for PBL Open
In the current conceptualisations of Problem Based Learning and how we practice it, the students are expected to possess the necessary academic competencies in order to study through PBL. However, a desk research reveals that students in m…
View article: Self-Driven Gate Driver for <i>LLC</i> Synchronous Rectification
Self-Driven Gate Driver for <i>LLC</i> Synchronous Rectification Open
This letter proposes a self-driven gate driver solely composed of passive components for synchronous rectification (SR). It utilizes the energy of the converter itself, automatically considers component tolerances and temperature variation…
View article: Tracking Multilevel Power Supplies for Class-D Audio Amplifiers
Tracking Multilevel Power Supplies for Class-D Audio Amplifiers Open
Switch-mode technology is the common choice for high efficiency audio power amplifiers. The dynamic nature of real audio reduces efficiency as less continuous output power can be achieved. Based on methods used for RF amplifiers, this pape…
View article: ARCHAEOLOGY AND SIGILLOGRAPHY IN NORTHERN EUROPE
ARCHAEOLOGY AND SIGILLOGRAPHY IN NORTHERN EUROPE Open
ANYoNE FAMILIAR WITH the study of sigillography will know that the word "seal" (Latin: sigillum) has two meanings.A seal is both a seal impression and a seal matrix, the tool used to make the impression.By noting this, we have already touc…
View article: A Time-Based Control Scheme for Power Factor Correction Boost Converter
A Time-Based Control Scheme for Power Factor Correction Boost Converter Open
A time-based control scheme for the power factor correction (PFC) boost rectifier is presented. Average-currentmode control in time is achieved using time-based compensators performing a proportional-integral control action. The controller…
View article: Next generation of power electronic-converter application for energy-conversion and storage units and systems
Next generation of power electronic-converter application for energy-conversion and storage units and systems Open
By a rearrangement of the traditional supply-converter-load system connection, partial-power-processing-based converters can be used to achieve a reduction in size and cost, increase in system efficiency and lower device power rating. The …
View article: Digital Control in Piezotransformer-based Converters
Digital Control in Piezotransformer-based Converters Open
INTRODUCTION\nConverters are today used in nearly all electronics from battery management in cell phones\nand laptops to fuel cell supplies to supply in a car.\nThe demand for smaller and more efficient converters are increasing as the tre…
View article: An Improved Linear Model for High Frequency Class-DE Resonant Converter using the Generalized Averaging Modeling Technique
An Improved Linear Model for High Frequency Class-DE Resonant Converter using the Generalized Averaging Modeling Technique Open
As the operating frequency of power converters increases, the passive component values likewise decrease. This results in the effect of the parasitic components becoming more prominent, leading to significant modeling errors if not conside…
View article: Fractional Charging Converter With High Efficiency and Low Cost for Electrochemical Energy Storage Devices
Fractional Charging Converter With High Efficiency and Low Cost for Electrochemical Energy Storage Devices Open
High efficiency and low cost power converters for interfacing energy storage have become critical in renewable energy systems. In this paper a fractional charging converter (FCC) is proposed to reduce power rating as well as cost of the dc…
View article: Higher Power Density Amplifiers
Higher Power Density Amplifiers Open
This paper proposes a new switching strategy for switch-mode power audio amplifiers beneficial for the power dissipation in the switching devices of the power stage. The strategy is based on a thorough analysis of the loss mechanism and oper…
View article: Analysis and Design of a dc-dc Converter Using Visual Aid
Analysis and Design of a dc-dc Converter Using Visual Aid Open
Designing a switched-mode power supply includes the calculation of the loss in all of the different components: inductor, transformer, switches and capacitors. By combining all of the loss calculations, and providing a graphical user inter…
View article: Analysis and Comparison of dc/dc Topologies in Partial Power Processing Configuration for Energy Storage Systems
Analysis and Comparison of dc/dc Topologies in Partial Power Processing Configuration for Energy Storage Systems Open
This paper presents an analysis and comparison of dc/dc switched-mode power supplies (SMPS) for energy storage systems in partial power processing (PPP) configuration. The advantage of this configuration is that the SMPS only processes the…
View article: Loss analysis of GaN based partial parallel isolated bidirectional full bridge boost converter
Loss analysis of GaN based partial parallel isolated bidirectional full bridge boost converter Open
A theoretical loss analysis is presented for GaN switches, for which conduction and switching losses are considered, and for planar transformers, where winding and core losses are considered. The analysis is then used to make a comparison …
View article: Improved Analysis and Modelling of Leakage Inductance for Planar Transformers
Improved Analysis and Modelling of Leakage Inductance for Planar Transformers Open
Planar transformers have often been mistaken to essentially have lower leakage inductances. The “radial effect” is a nature characteristic for planar windings due to a higher aspect ratio of conductor width to conductor thickness, which gi…
View article: Analysis and Optimization of Coupled Windings in Magnetic Resonant Wireless Power Transfer Systems with Orthogonal Experiment Method
Analysis and Optimization of Coupled Windings in Magnetic Resonant Wireless Power Transfer Systems with Orthogonal Experiment Method Open
The coupled magnetic resonant unit (CMRU) has great effect on the transmitting power capability and efficiency of magnetic resonant wireless power transfer system. The key objective i.e. the efficiency coefficient kQ is introduced in the d…
View article: Review of high efficiency bidirectional dc-dc topologies with high voltage gain
Review of high efficiency bidirectional dc-dc topologies with high voltage gain Open
A review of high voltage gain, high efficiency bidirectional dc-dc topologies is presented. Each converters primary benefit is highlighted, and a summary of all the converters is presented. It is observed that voltage gains higher than 20 …
View article: Analysis of Current-Bidirectional Buck-Boost Based Switch-Mode Audio Amplifier
Analysis of Current-Bidirectional Buck-Boost Based Switch-Mode Audio Amplifier Open
The following study was carried out in order to assess quantitatively the performance of the buck-boost converter when used as switch-mode audio amplifier. It comprises of, to begin with, the delimitation of design criteria based on the st…