Search Results - chi+ming+wang

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Forced Unbalanced Method to Reduce Transient Current Unbalance in Semiconductor Power Switches

Switching power devices, specifically SiC MOSFET, has wider parameter variations (Vth, Rds(on)) due to fabrication process; therefore, when putting several MOSFET dies togther in parallel in a power module, there will be current/power unbalance when they are being used. Several publications have mentioned about using different control techniques to...

Published: 2/6/2017 | Inventor(s): Zichen Miao, Yincan Mao, Khai Ngo, Chi Ming Wang

Keywords(s):

Category(s): Electrical, Energy, Engineering, Transportation

Parasitic Inductances Coupling to Reduce Transient Current Unbalance in Semiconductor Power Switches

Switching power devices, specifically SiC MOSFET, has wider parameter variations (Vth, Rds(on)) due to fabrication process: therefore, when putting several MOSFET dies together in parallel in a power module, there will be current/power unbalance when they are being used. Several publications have mentioned about using different control techniques to...

Published: 1/13/2017 | Inventor(s): Yincan Mao, Zichen Miao, Khai Ngo, Chi Ming Wang

Keywords(s):

Category(s): Electrical, Energy, Engineering, Transportation

Use Parasitic Inductance Coupling to Eliminate Power Device Switching Operation Reliability Issues Such As Cross-Talk, Self Turn-On, and Self-Sustained Oscillation

The purpose of this invention is to show the new concept of using parasitic inductance coupling to improve SiC MOSFET switching operation reliability to prevent detrimental phenomenon such as crosstalk, self turn-on, and self-sustained oscillation from happening. Conventional methods either slow down the circuit or increase the design complexity. In...

Published: 1/13/2017 | Inventor(s): Yincan Mao, Zichen Miao, Khai Ngo, Chi Ming Wang

Keywords(s):

Category(s): Electrical, Energy, Engineering, Transportation

Distributed Kelvin-Source Resistance to Reduce Dynamic Power/Current Imbalance in Paralleled Semiconductor Power Switches

Switching power devices, especially SiC MOSFETs, have wide parameter variations due to fabrication process. When putting several MOSFETs in parallel, there will be current/power unbalance during switching transient. Several publications have mentioned about using different control techniques to actively reduce the unbalance. However, these controls...

Published: 1/13/2017 | Inventor(s): Yincan Mao, Zichen Miao, Khai Ngo, Chi Ming Wang

Keywords(s):

Category(s): Electrical, Energy, Engineering, Transportation

Cooler with EMI-Limiting Inductor

A power switch is mounted on a cooler via isolating dielectric ( such as alumina or aluminum-nitride) that forms a "parasitic" capacitor (referred to herein as C dielectric) measuring tens to hundreds of pico-Farads. As the switch's terminal(s) transitions from one voltage level to another, noise current commonly known as EMI (Electro-Magnetic...

Published: 7/18/2016 | Inventor(s): Khai Ngo, Han Cui, Chi Ming Wang

Keywords(s):

Category(s): Electrical