Gate driver

About: Gate driver is a research topic. Over the lifetime, 7532 publications have been published within this topic receiving 75854 citations.

Towards an airborne high temperature SiC inverter

Abstract: SiC devices enable for high temperature operation of power converters. The paper describes the laboratory step by step work towards an airborne high temperature inverter : 200C cooling source, 4 kVA power. From 'JFET only' to 'full three phase power stage' tested up to 250C, including capacitor. Device samples are characterized in order to set the requirements for the gate driver and to evaluate maximum switchable power. Switching losses are measured using high precision shunt and voltage probes. A prototype is built and operation under full load (15A) is verified.

A Gate Driver of SiC MOSFET for Suppressing the Negative Voltage Spikes in a Bridge Circuit

Abstract: SiC mosfet has low on-state resistance and can work on high switching frequency, high voltage, and some other tough conditions with less temperature drift, which could provide the significant improvement of power density in power converters. However, for the bridge circuit in an actual converter, high dv/dt during fast switching transient of one mosfet will amplify the negative influence of parasitic components and produce the significant negative voltage spikes on the complementary mosfet , which will threaten its safe operation. This paper proposes a new gate driver circuit for SiC mosfet to attenuate the negative voltage spikes in a bridge circuit. The proposed gate driver adopts a simple voltage dividing circuit to generate a negative gate-source voltage as traditional and a passive triggered transistor with a series-connected capacitor to suppress the negative voltage spikes, which could satisfy the stringent requirements of fast switching SiC mosfet s under the high dc voltage condition with low cost and less complexity. An analysis is presented in this paper based on the simulation and experimental results with the performance comparison evaluated.

Liquid crystal display for improving dynamic contrast and a method for generating gamma voltages for the liquid crystal display

Abstract: An LCD for improving dynamic contrast by adjusting gamma voltages according to the brightness of an image is provided. The LCD includes: a liquid crystal display panel assembly having a plurality of pixels provided on crossing areas of a plurality of gate lines and a plurality of data lines; a gate driver applying voltage signals for sequentially scanning the gate lines; a source driver applying voltage signals for image display to the data lines; a timing controller providing image data and a control signal for the source driver, providing a gate line on/off control signal for the gate driver, and outputting digital gamma data to a digital/analogue (D/A) converter; and the D/A converter connected to the timing controller for converting the digital gamma data from the timing controller into analog signals to generate a plurality of gamma voltages and outputting the gamma voltages to the source driver. The LCD generates the gamma voltages by the D/A converter in place of using serially-connected resistors, and thus, the gamma voltages may vary depending on the brightness of the image.

A new di/dt control gate drive circuit for IGBTs to reduce EMI noise and switching losses

Abstract: In this paper, a new di/dt control gate drive circuit for IGBT devices is proposed. By this circuit, the switching performances of IGBT such as dv/dt, di/dt, surge voltage and also switching losses are reduced. This scheme can also eliminate a snubber circuit from the inverter system. From experimental tests, the EMI noise level is reduced by more than 15 dBuV/m as compared with conventional systems.

Drive amplifier for power line communications

Abstract: A power line communication amplifier circuit for providing a signal transmission across a power line medium when operating in a transmit mode, and for providing a relatively high input impedance to the power line when in a receive mode includes a unity gain buffer integrally coupled with a filter. The filter operates upon an input signal provided by a digital driver means. A control means is coupled to the digital driver means and to the buffer such that when said amplifier is switched to a receive mode, both the driver means and buffer provide a high input impedance.