This article proposes a scheme for balancing the voltage of series-connected insulated gate bipolar transistors (IGBTs), which is also very effective under short-circuit conditions. An optimized clamp-mode snubber proposed, including an active-driver to balance currents IGBTs during short-circuit, in turn allows considerable reduction capacitance. The approach proven be conditions by maximum 55...

One oC the most popular and most powerCul circuit simulators, the SPICE-2G program Crom University oC California, Berkeley, is rather inefficient in interactive applications because oC its "batch-oriented" structure. SPICE-PAC is a package (or a set) oC subroutines which is Cunctionally equivalent to the SPICE-2G circuit simulator, i.e., it accepts the same circuit description and perCorms all ...

Through extensive literature search, it has been found that there exists strong correlation between the Mental Workload of an automobile driver with his or her physiological measurements, especially the Heart Rate Variability (HRV) measurements. In order to make a driver's HRV monitoring on the road possible, a new photoplethysmograph (PPG) Ring Sensor prototype has been devised specifically fo...

This paper describes the thermal and electrical characteristics of GaN on SiC power transistors that have been designed to be mounted directly upon a CMOS driver integrated circuit. In order to maximize the customer value proposition and minimize the cost implications of using a high capability GaN on SiC die, the hybrid device has to exhibit substantial performance and convenience advantages o...

eGaN FETs have repeatedly demonstrated higher efficiency than MOSFETs in wireless power transfer amplifiers when operated over a wide impedance range using a ZVS Class D amplifier [1, 2, 3, 4, 5, 6, 7, and 8]. In this article we examine a method to further improve the performance of eGaN FETs by replacing the bootstrap diode of the high side gate driver with an eGaN FET that is driven synchrono...

Cenex, the UK’s centre of excellence for low carbon and fuel cell technologies, is currently deploying electric passenger cars and vans throughout the UK in a series of Government funded low carbon vehicle trials. This study, produced in partnership with Millbrook Proving Ground, investigates comments and concludes on energy consumption in electric vehicles with varying driving styles and drivi...

A-Tree is a rectilinear Steiner tree in which every sink is connected to a driver by a shortest length path, while simultaneously minimizing total wire length. This paper presents a polynomial approximation algorithm for the generalized version of A-Tree problem with upper-bounded delays along each path from the driver to the sinks and with restrictions on the number of Steiner nodes. We refer ...

This paper presents a highly flexible and complete 256-electrode retinal prosthesis chip, which is small and ready for packaging and implantation. The chip contains 256 separate programmable drivers each of which is dedicated to its own electrode for flexible stimulation. The stimulator possesses a wide range of stimulation features, supporting various stimulation strategies. Many safety featur...

A high voltage, variable-frequency driver circuit for powering resonant multipole ion guides is presented. Two key features of this design are (1) the use of integrated circuits in the driver stage and (2) the use a stepper motor for tuning a large variable capacitor in the resonant stage. In the present configuration the available frequency range spans a factor of 2. The actual values of the m...