Search Results - jian+liu

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Single Gate Driver System for DC Circuit Breakers
THE CHALLENGE Single power semiconductor devices cannot meet the voltage demands for the solid-state switch in medium voltage DC circuit breakers (DCCBs) due to limitations in their voltage blocking capabilities. As a result, commercially available devices are often connected in series to meet the final clamping voltage target. Voltage balancing across...
Published: 9/29/2021   |   Inventor(s): Jian Liu, Lakshmi Ravi, Dong Dong, Rolando Burgos, Steve Schmalz
Keywords(s):  
Category(s): Electrical
Proposed Digital Constant On-Time Control
Digital power supplies are becoming more and more popular in the power electronics field. Power supplies with digital control can overcome many drawbacks of those with analog control and provide more functions easily to improve the whole system performance, such as passive components reduction, noise immunity, reprogrammability, communication and so...
Published: 9/3/2012   |   Inventor(s): Jian Li, Yang Qiu, Ming Xu, Fred Lee
Keywords(s):  
Category(s): Electrical
Proposed Hybrid Control Method for Digital PWM
This invention proposes a new DPWM control method. This method combines the ideas of constant frequency and constant on-time control. On the one hand, this method can achieve the same duty cycle resolution of constant on-time control, which is much higher than constant frequency control; on the other hand, it keeps the switching frequency nearly constant....
Published: 9/3/2012   |   Inventor(s): Jian Li, Dong Sam Ha, Yang Qiu, Ming Xu, Fred Lee
Keywords(s): Communications
Category(s): Electrical