Detailed Analysis of How Power Stage and Power Clip Products Achieve Optimized Power Density

2013 ◽  
Vol 2013 (1) ◽  
pp. 000782-000789
Author(s):  
Arthur Black
Keyword(s):  
Detailed Analysis ◽  
Power Density ◽  
Synchronous Rectifier ◽  
Power Stage

The power stage and power clip packages are designed to increase the power density, in a synchronous rectifier (SR) buck application, while using a significantly smaller PCB land pattern area than a conventional discrete pair of MOSFETs. This paper presents a detailed analysis of how these new Fairchild dual-die designs achieve this performance.

scholarly journals Monolithic Integrated High Frequency GaN DC-DC Buck Converters with High Power Density Controlled by Current Mode Logic Level Signal

Electronics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1540
Author(s):  
Longkun Lai ◽  
Ronghua Zhang ◽  
Kui Cheng ◽  
Zhiying Xia ◽  
Chun Wei ◽  
...  
Keyword(s):  
Power Density ◽  
Current Mode ◽  
Buck Converter ◽  
Switching Frequency ◽  
High Power Density ◽  
Current Mode Logic ◽  
Power Stage ◽  
Amplifier Stage ◽  
Gate Driver ◽  
Logic Level

Integration is a key way to improve the switching frequency and power density for a DC-DC converter. A monolithic integrated GaN based DC-DC buck converter is realized by using a gate driver and a half-bridge power stage. The gate driver is composed of three stages (amplitude amplifier stage, level shifting stage and resistive-load amplifier stage) to amplify and modulate the driver control signal, i.e., CML (current mode logic) level of which the swing is from 1.1 to 1.8 V meaning that there is no need for an additional buffer or preamplifier for the control signal. The gate driver can provide sufficient driving capability for the power stage and improve the power density efficiently. The proposed GaN based DC-DC buck converter is implemented in the 0.25 μm depletion mode GaN-on-SiC process with a chip area of 1.7 mm × 1.3 mm, which is capable of operating at high switching frequency up to 200 MHz and possesses high power density up to 1 W/mm2 at 15 V output voltage. To the authors’ knowledge, this is the highest power density for GaN based DC-DC converter at the hundreds of megahertz range.

Synchronous Rectification Strategy for LLC Resonant DC-DC Converter

2011 ◽  
Vol 317-319 ◽  
pp. 2138-2143
Author(s):  
Zhen Xu ◽  
Guo Xing Zhang
Keyword(s):  
Power Electronics ◽  
Power Density ◽  
Conversion Efficiency ◽  
High Efficiency ◽  
Current Sensing ◽  
Advantages And Disadvantages ◽  
Synchronous Rectifier ◽  
Voltage Doubler ◽  
Great Utilization ◽  
Secondary Side

High efficiency /high power density is one of the hottest research spots in power electronics technique. Due to simple structure and high conversion efficiency, the LLC resonant DC-DC converter has great utilization potential in many application areas. To improve the conversion efficiency and the power density further, synchronous rectifier is widely adopted at the secondary-side. Based on the existed synchronous rectified LLC resonant DC-DC converter reviewed in this paper, advantages and disadvantages are analyzed and compared in detail. A novel primary-side current sensing strategy and a new current driving method for voltage-doubler rectifier are presented. Finally, this paper proposes a family of novel single package structure for synchronous rectifier from the view point of power electronics integration to improve the performance further.

Full SiC DCDC-Converter with a Power Density of more than 100kW/dm3

2015 ◽  
Vol 821-823 ◽  
pp. 884-888 ◽  
Author(s):  
Otto Kreutzer ◽  
Martin März ◽  
Hideki Nakata
Keyword(s):  
Power Density ◽  
High Power ◽  
Hybrid Vehicles ◽  
Switching Frequency ◽  
High Power Density ◽  
Passive Components ◽  
Custom Made ◽  
Power Stage ◽  
Parasitic Effects ◽  
Made In

This Paper describes a non-isolated bidirectional full SiC 800V 200kW DCDC-converter power stage for electric and hybrid vehicles that reaches a power density of more than 100 kW/dm3 at a switching frequency of 200 kHz. The high power density is achieved by the use of SiC-MOSFETs sintered on custom made Si3N4DCB-substrates controlled by custom made extremely flat drivers and a resulting very low inductive DC-link connection. All passive components like inductors and capacitor boards are custom made in order to keep all parasitic effects as low as possible. The power is subdivided on six interleaved phases to reduce the required capacitor ripple current capability.

Prosodic Impairment Associated With Traumatic Brain Injury

2009 ◽  
Vol 19 (3) ◽  
pp. 97-102
Author(s):  
Billy Irwin
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Detailed Analysis ◽  
Acoustic Characteristics ◽  
Individual Variations

Abstract Purpose: This article discusses impaired prosody production subsequent to traumatic brain injury (TBI). Prosody may affect naturalness and intelligibility of speech significantly, often for the long term, and TBI may result in a variety of impairments. Method: Intonation, rate, and stress production are discussed in terms of the perceptual, physiological, and acoustic characteristics associated with TBI. Results and Conclusions: All aspects of prosodic production are susceptible to the effects of damage resulting from TBI. There are commonly associated prosodic impairments; however, individual variations in specific aspects of prosody require detailed analysis.

Assessment of the state and level of development of public-private partnership projects in the subjects of the Russian Federation

2018 ◽  
pp. 131-141 ◽  
Author(s):  
A. N. Savrukov ◽  
N. T. Savrukov ◽  
E. A. Kozlovskaya
Keyword(s):  
Detailed Analysis ◽  
Russian Federation ◽  
Significant Proportion ◽  
Transport Sector ◽  
Private Partnership ◽  
Current State ◽  
Central Regions ◽  
The Russian Federation ◽  
Project Data ◽  
Municipal Level

The article analyzes the current state and level of development of publicprivate partnership (PPP) projects in the subjects of the Russian Federation. The authors conclude that a significant proportion of projects is implemented on a concession basis at the municipal level in the communal sphere. A detailed analysis of the project data showed that the structure of the projects is deformed in favor of the central regions of the Russian Federation, and a significant share in the total amount of financing falls on the transport sector. At the stage of assessing the level of development by the subjects of the Russian Federation, criteria were proposed, and index and integral indicators were used, which ensured comparability of the estimates obtained. At the end of the analysis, the regions were ranked and clustered according to the level of PPP development, which allowed to reveal the number and structure of leaders and outsiders.

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