Arnold Knott
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View article: The Manufacture of Unbreakable Bionics via Multifunctional and Self‐Healing Silk–Graphene Hydrogels (Adv. Mater. 35/2021)
The Manufacture of Unbreakable Bionics via Multifunctional and Self‐Healing Silk–Graphene Hydrogels (Adv. Mater. 35/2021) Open
Biocompatible Materials The history of biomaterials began with naturally derived materials such as nacre and animal tissues. Gradually mankind developed more advanced materials such as metals, ceramics, alloys and polymers to yield prosthe…
View article: The Manufacture of Unbreakable Bionics via Multifunctional and Self‐Healing Silk–Graphene Hydrogels
The Manufacture of Unbreakable Bionics via Multifunctional and Self‐Healing Silk–Graphene Hydrogels Open
Biomaterials capable of transmitting signals over longer distances than those in rigid electronics can open new opportunities for humanity by mimicking the way tissues propagate information. For seamless mirroring of the human body, they a…
View article: Analysis and Design of a Charge-Pump-Based Resonant AC-DC Converter with Inherent PFC Capability
Analysis and Design of a Charge-Pump-Based Resonant AC-DC Converter with Inherent PFC Capability Open
This paper presents the analysis and design of a resonant power factor correction (PFC) rectifier for the first stage in single-phase front-end offline converters targeting low-power applications (up to 100 W). With the addition of a charg…
View article: Analysis and Design of a Resonant Power Converter with Wide Input Voltage Range for AC/DC Applications
Analysis and Design of a Resonant Power Converter with Wide Input Voltage Range for AC/DC Applications Open
Resonant converter topologies have the ability to eliminate switching losses through zero-voltage switching, making them well-suited for switching operation in the MHz frequency range. However, these types of converters are traditionally v…
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: A High-Efficiency 1 MHz 65 W GaN-Based LLC Resonant DC-DC Converter
A High-Efficiency 1 MHz 65 W GaN-Based LLC Resonant DC-DC Converter Open
This paper presents an LLC resonant DC-DC converter for single-phase offline converters. A 1 MHz 400 V to 48 V prototype employing gallium nitride (GaN) switching devices is designed and implemented. A high-frequency magnetic material is u…
View article: Solar Powered Audio System
Solar Powered Audio System Open
NTRODUCTION\nOn music festivals such as Roskilde Festival, many of the guests bring their music systems.\nThis can be anything from an old fashioned transistor radio to a car stereo system. In\ncommon for all of these systems are that they…
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: A Series-Resonant Charge-Pump-Based Rectifier with Inherent PFC Capability
A Series-Resonant Charge-Pump-Based Rectifier with Inherent PFC Capability Open
This paper presents a power factor correction (PFC) rectifier for single-phase offline converters. With the addition of a charge pump circuit comprised of a capacitor and a diode to a class-DE series-resonant converter, PFC is achieved inh…
View article: Flexible Electronics: A Protein‐Based, Water‐Insoluble, and Bendable Polymer with Ionic Conductivity: A Roadmap for Flexible and Green Electronics (Adv. Sci. 5/2019)
Flexible Electronics: A Protein‐Based, Water‐Insoluble, and Bendable Polymer with Ionic Conductivity: A Roadmap for Flexible and Green Electronics (Adv. Sci. 5/2019) Open
In article number 1801241, Alireza Dolatshahi‐Pirouz and co‐workers develop an ultra‐sensitive, but low‐cost electrode with a broad range of exciting properties brought about through a simple “design and mixing procedure.” As examples, a t…
View article: A Protein‐Based, Water‐Insoluble, and Bendable Polymer with Ionic Conductivity: A Roadmap for Flexible and Green Electronics
A Protein‐Based, Water‐Insoluble, and Bendable Polymer with Ionic Conductivity: A Roadmap for Flexible and Green Electronics Open
Proteins present an ecofriendly alternative to many of the synthetic components currently used in electronics. They can therefore in combination with flexibility and electroactivity uncover a range of new opportunities in the field of flex…
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: Low Jitter Voltage Controlled Oscillator and Gatedriver for VHF Switch Mode Power Supplies
Low Jitter Voltage Controlled Oscillator and Gatedriver for VHF Switch Mode Power Supplies Open
Decreasing size of consumer electronics pushes demands for higher power density and higher efficiency. Increased switching frequency can reduce the size, but generating MHz gate signals is nontrivial, e.g. due to jitter. We show a custom I…
View article: A High-Voltage Low-Power Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices for LED Drivers
A High-Voltage Low-Power Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices for LED Drivers Open
Previous research on switched-capacitor DC-DC converters has focused on low-voltage and/or high-power ranges where the efficiencies are dominated by conduction loss. Switched-capacitor DC-DC converters at high-voltage (> 100 V) low-power (…
View article: A High-Voltage Low-Power Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices for LED Drivers
A High-Voltage Low-Power Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices for LED Drivers Open
Previous research on switched-capacitor DC-DC converters has focused on low-voltage and/or high-power ranges, where the efficiencies are dominated by conduction losses. Switched-capacitor DC-DC converters at high-voltage (> 100 V) and low-…
View article: High-<italic>Q</italic> Three-Dimensional Microfabricated Magnetic-Core Toroidal Inductors for Power Supplies in Package
High-Q Three-Dimensional Microfabricated Magnetic-Core Toroidal Inductors for Power Supplies in Package Open
The integration of power inductors is a roadblock in realizing highly miniaturized power supply in package (PSiP) and power supply on chip. Inductors in such power systems are used for energy storage and filtering, but they dominate in siz…
View article: Evaluation of custom-designed lateral power transistors in a silicon-on-insulator process in a synchronous buck converter
Evaluation of custom-designed lateral power transistors in a silicon-on-insulator process in a synchronous buck converter Open
Most of todays power converters are based on power semiconductors, which are built in vertical power semiconductor processes. These devices result in limited packaging possibilities, which lead to physically long galvanic connections and t…
View article: A 380 V High Efficiency and High Power Density Switched-Capacitor Power Converter using Wide Band Gap Semiconductors
A 380 V High Efficiency and High Power Density Switched-Capacitor Power Converter using Wide Band Gap Semiconductors Open
State-of-the-art switched-capacitor DC-DC power converters mainly focus on low voltage and/or high power applications. However, at high voltage and low power levels, new designs are anticipated to emerge and a power converter that has both…
View article: Resonant Full-Bridge Synchronous Rectifier Utilizing 15V Gan Transistors For Wireless Power Transfer Applications Following Airfuel Standard Operating At 6.78Mhz
Resonant Full-Bridge Synchronous Rectifier Utilizing 15V Gan Transistors For Wireless Power Transfer Applications Following Airfuel Standard Operating At 6.78Mhz Open
Connectivity in smart devices is increasingly realized by wireless connections. The remaining reason for using connectors at all is for charging the internal battery, for which wireless power transfer is an alternative. Two industry standa…
View article: Microfabricated Air-Core Toroidal Inductor in Very High-Frequency Power Converters
Microfabricated Air-Core Toroidal Inductor in Very High-Frequency Power Converters Open
Miniaturization of power supplies is required for future intelligent electronic systems e.g. internet of things devices. Inductors play an essential role, and they are by far the most bulky and expensive components in power supplies. This …
View article: Miniaturization of LED Drivers
Miniaturization of LED Drivers Open
With the current trend towards smaller and highly portable consumer electronics and other industrial applications, one area with a great demand for such miniaturization is the lighting industry. The main hinder has been the power supplies,…
View article: Optimal Modulator with Loudspeaker Parameter Inclusion
Optimal Modulator with Loudspeaker Parameter Inclusion Open
Today, most class-D amplifier designs are able to deliver high efficiency and low distortion. However, the effect ofparasitic components and speaker dynamics are not taken into account, resulting in a degradation of the performance.This pa…
View article: Efficiency Investigation of Subwoofer Driven Around Resonance Frequency
Efficiency Investigation of Subwoofer Driven Around Resonance Frequency Open
The need for efficient portable speaker systems has increased tremendously over the past 10 years. The batteries, amplifiers and filtering has all seen great improvements in efficiency leaving the speakers units as the most inefficient par…
View article: Model for Evaluation of Power Consumption of Vented Box Loudspeakers
Model for Evaluation of Power Consumption of Vented Box Loudspeakers Open
In the design of mobile sound systems an estimation of power consumption must be made in order to choose a battery of appropriate size and cost. However poor methods for power estimation tend to result in large and costly batteries. This p…
View article: Design of Efficient Sound Systems for Low Voltage Battery Driven Applications
Design of Efficient Sound Systems for Low Voltage Battery Driven Applications Open
The efficiency of portable battery driven sound systems is crucial as it relates to both the playback time and cost of the system. This paper presents design considerations when designing such systems. This include loudspeaker and amplifie…
View article: Loss distribution analysis of a three-port converter for low-power stand-alone light-to-light systems
Loss distribution analysis of a three-port converter for low-power stand-alone light-to-light systems Open
In locations far from the equator achieving high conversion efficiency in low-power solar systems is challenging due to low solar irradiance levels. This paper presents a high efficiency three-port converter (TPC) for light-to-light (LtL) …
View article: Nonlinear Parasitic Capacitance Modelling of High Voltage Power MOSFETs in Partial SOI Process
Nonlinear Parasitic Capacitance Modelling of High Voltage Power MOSFETs in Partial SOI Process Open
State-of-the-art power converter topologies such as resonant converters are either designed with or affected by the parasitic capacitances of the power switches. However, the power switches are conventionally characterized in terms of swit…