Palliyage Srilak Nirmana Perera

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The broad applications of ultrawide-band signals and terahertz waves in quantum measurements, imaging and sensing techniques, advanced biological treatments, and very-high-data-rate communications have drawn extensive attention to ultrafast electronics. In ...

To best utilize power converters, a sound understanding of the relationship between the circuit topology and the power-semiconductor-device characteristics is required. This is especially important in high-frequency switching, where device parasitics start ...

The important distinction between stored energy and co-energy components of the output capacitance of field-effect transistors (FETs) is not explicitly discussed in the literature, and hence, less understood in relation to the switching losses in power ele ...

Resonant-type power converters are supposed to generate zero switching losses during soft-switching operation. In recent research, unexpected switching losses were reported in these converters, which were attributed to a large-signal hysteresis observed in ...

In this paper, we review some of the main methods to characterize on-state and off-state losses in wide-band-gap devices under switching conditions. In the off-state, we will discuss about losses related to charging and discharging the output capacitance i ...

In this work, we demonstrate a state-of-the-art high step-up/down dual-active-bridge (DAB) converter designed with GaN transistors, to achieve a high efficiency and large power-density. A quasi-planar matrix transformer with high step-up/down ratio is demo ...

Low ON-resistance of advanced superjunction (SJ) and GaN-on-Si transistors is of great importance in power converters, however, the anomalous loss in their output capacitance (C OSS ) severely limits their performance. In this work, we use an energy-orient ...

Wide-band-gap (WBG) power semiconductor devices are gaining an increasing interest in power circuits, as they exhibit a low specific ON-resistance (RON) while providing a high blocking voltage. The energy dissipation corresponding to resonantly charging an ...

For certain field-effect transistors (FETs) in soft-switching operation, the large-signal behavior of their output capacitance ( Co ) has shown to deviate considerably from the datasheet values. This can have a significant effect on hard-switching losses i ...

This work presents a mixed simulation experimental method for efficiency optimization of a modular multilevel switched capacitor DC-DC converter. The results show that the optimal frequency deviates from the circuit's self-resonant frequency, commonly prop ...

With reducing transistor sizes and increasing levels of integration, extracting the heat from electronic devices is an ongoing challenge. Conventional indirect-cooling approaches are hindered by thermal interfaces, as well as heat spreading to larger areas ...

Efficient and compact power conversion is a key requirement to achieve sustainable electrification of our society. GaN-based power devices offer major benefits compared to their silicon counterparts in terms of efficiency and integration but suffer from se ...

The dissipated energy (Ediss) related to the resonant charging/discharging of a transistor output capacitance, becomes a dominant loss factor for power converters operating in the MHz range. A recent work has introduced a small-signal measurement method to ...

The difficulty in accurately measuring losses in high-frequency power converters hinders accurate breakdown of losses which is essential for device and circuit optimization. Electrical methods are often not adequate and calorimetric approaches found in the ...

Wide-Band-Gap semiconductors have enabled considerable miniaturization of power devices, which requires, however, new thermal management solutions to handle the resulting high heat fluxes. Recently, embedded liquid cooling in GaN-on-Si devices was demonstr ...

Recent research has reported an undesirable OFF-state loss in high-frequency soft-switching power converters, such as resonant converters. This loss is attributed to a hysteresis loss related to the charging-discharging process of the output capacitance of ...

The low ON-resistance of wide-band-gap (WBG) transistors is a key feature for efficient power converters, however, the anomalous loss in their output capacitance (COSS) severely limits their performance at high switching frequencies. Characterizing COSS-lo ...

Soft-switching power converters based on wide-band-gap (WBG) transistors offer superior efficiency and power density advantages. However, at high frequencies, loss behavior varies significantly between different WBG technologies. This includes losses relat ...

Cascode topology which includes a high-voltage GaN and a low-voltage Si transistor is an attractive device concept, which uses the low ON-resistance of GaN while still being compatible with Si gate drivers. It demonstrates the highest threshold voltage amo ...

Palliyage Srilak Nirmana Perera

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Nanoplasma-enabled picosecond switches for ultrafast electronics

Hard and Soft Switching Losses in Power Converters: Role of Transistor Output Capacitance

Analysis of Output Capacitance Co-Energy and Discharge Losses in Hard-Switched FETs

Output-Capacitance Hysteresis Losses of Field-Effect Transistors

Switching losses in power devices: From dynamic on resistance to output capacitance hysteresis

97.4%-Efficient All-GaN Dual-Active-Bridge Converter with High Step-up High-Frequency Matrix Transformer

Investigation on Output Capacitance Losses in Superjunction and GaN-on-Si Power Transistors

Output Capacitance Losses in Wide-Band-Gap Transistors: A Small-Signal Modeling Approach

Hard-Switching Losses in Power FETs: The Role of Output Capacitance

Mixed Simulation-Experimental Optimization of a Modular Multilevel Switched Capacitors Converter Cell

Bringing the Heat Sink Closer to the Heat: Evaluating Die-embedded Microchannel Cooling of GaN-on-Si Power Devices

Embedded Microchannel Cooling for Monolithically-integrated GaN Half-bridge ICs

Comparison of Wide-Band-Gap Technologies for Soft-Switching Losses at High Frequencies (vol 35, pg 12595, 2020)

Coss Loss Tangent of Field-Effect Transistors: Generalizing High-Frequency Soft-Switching Losses

Microchannel-based Calorimeter for Rapid and Accurate Loss Measurements on High-efficiency Power Converters

Impact of Embedded Liquid Cooling on the Electrical Characteristics of GaN-on-Si Power Transistors

Active-Device Losses in Resonant Power Converters: A Case Study with Class-E Inverters

New Insights on Output Capacitance Losses in Wide-Band-Gap Transistors

Comparison of Wide-band-gap Technologies for Soft-Switching Losses at High Frequencies

Negative Resistance in Cascode Transistors