High efficiency and high power density VCSEL chip for 3D sensing

2021 ◽  
Author(s):  
Yao Xiao ◽  
Shaoyang Tan ◽  
Jun Wang ◽  
HENG LIU
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
High Power Density ◽  
3D Sensing

scholarly journals Near-field thermophotovoltaics for efficient heat to electricity conversion at high power density

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rohith Mittapally ◽  
Byungjun Lee ◽  
Linxiao Zhu ◽  
Amin Reihani ◽  
Ju Won Lim ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Near Field ◽  
Electrical Power ◽  
Photovoltaic Cells ◽  
High Power Density ◽  
Pv Cell ◽  
Electrical Power Output ◽  
Power Densities

AbstractThermophotovoltaic approaches that take advantage of near-field evanescent modes are being actively explored due to their potential for high-power density and high-efficiency energy conversion. However, progress towards functional near-field thermophotovoltaic devices has been limited by challenges in creating thermally robust planar emitters and photovoltaic cells designed for near-field thermal radiation. Here, we demonstrate record power densities of ~5 kW/m2 at an efficiency of 6.8%, where the efficiency of the system is defined as the ratio of the electrical power output of the PV cell to the radiative heat transfer from the emitter to the PV cell. This was accomplished by developing novel emitter devices that can sustain temperatures as high as 1270 K and positioning them into the near-field (<100 nm) of custom-fabricated InGaAs-based thin film photovoltaic cells. In addition to demonstrating efficient heat-to-electricity conversion at high power density, we report the performance of thermophotovoltaic devices across a range of emitter temperatures (~800 K–1270 K) and gap sizes (70 nm–7 µm). The methods and insights achieved in this work represent a critical step towards understanding the fundamental principles of harvesting thermal energy in the near-field.

High-Power-Density High-Efficiency Bottom-Emitting Vertical-Cavity Surface-Emitting Laser Array

2011 ◽  
Vol 4 (5) ◽  
pp. 052104 ◽  
Author(s):  
Di Liu ◽  
Yongqiang Ning ◽  
Yugang Zeng ◽  
Li Qin ◽  
Yun Liu ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Cavity Surface ◽  
High Power Density ◽  
Laser Array ◽  
Vertical Cavity Surface ◽  
Surface Emitting Laser ◽  
Vertical Cavity

High Temperature Silicon-on-Insulator Gate Driver for SiC-FET Power Modules

2011 ◽  
Vol 2011 (HITEN) ◽  
pp. 000152-000158
Author(s):  
J. Valle Mayorga ◽  
C. Gutshall ◽  
K. Phan ◽  
I. Escorcia ◽  
H. A. Mantooth ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Low Voltage ◽  
Silicon On Insulator ◽  
Switching Frequency ◽  
Cmos Process ◽  
High Power Density ◽  
Power Modules ◽  
Gate Driver

SiC power semiconductors have the capability of greatly outperforming Si-based power devices. Faster switching and smaller on-state losses coupled with higher voltage blocking and temperature capabilities, make SiC a very attractive semiconductor for high performance, high power density power modules. However, the temperature capabilities and increased power density are fully utilized only when the gate driver is placed next to the SiC devices. This requires the gate driver to successfully operate under these extreme conditions with reduced or no heat sinking requirements, allowing the full realization of a high efficiency, high power density SiC power module. In addition, since SiC devices are usually connected in a half or full bridge configuration, the gate driver should provide electrical isolation between the high and low voltage sections of the driver itself. This paper presents a 225 degrees Celsius operable, Silicon-On-Insulator (SOI) high voltage isolated gate driver IC for SiC devices. The IC was designed and fabricated in a 1 μm, partially depleted, CMOS process. The presented gate driver consists of a primary and a secondary side which are electrically isolated by the use of a transformer. The gate driver IC has been tested at a switching frequency of 200 kHz at 225 degrees Celsius while exhibiting a dv/dt noise immunity of at least 45 kV/μs.

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