A New 1200V-rating, trench gate NPT(Non Punch Though)-IGBT(Insu1ated Gate Bipolar Transistor) and -IEGT(Injection Enhancement Gate Transistor) have been developed. Some works for the IE(carrier [njection Enhancement) effect related to relatively high voltage devices were reported [1,2,3,4]. This time, the IE-effect was employed in 1200V-rating trench gate NPT-IGBT for the first time. The IE-effect was adopted mainly by making some p-bast: regions not contacted to the emitter electrode. By numerical simulation, it is found that the IE-effect is effective in reducing on-state voltage for 1200V-rating NPT-IGBT. On the basis of these investigations, a 15OA-rating IGBT chip was fabricated. The on-state voltage for this new device has resulted in as low as 1.8V at 85A/cmZ without sacrificing its ruggedness to withstand destruction and its margin for blocking voltage. Emitter r electrode r Source Itacted n-base 7 r collector \ I Fig. 1 New trench gate NPT-IGElT structure
A newly developed AVI transponder is to be used in Automatic Vehicle Identification (AVI) system, which provides identification of moving vehicles passing by a certain location, as to its registration number, and classification etc. This AVI system is characterized by the fact that it utilizes ceramic resonators in the composition of a transponder identification code, and a single microwave carrier to convey an interrogation signal to, and a response signal from, that transponder.The transponder is a completely passive device free of any power supply, and operates as a “Reflector”. Overall external dimensions of transponder are 7 × 10 × 1 cm with a weight of 150 grams, the unit is compact, light weight and can be mounted easily on the vehicle, and is easy to carry.All of the circuitry required for the transponder is provided in the form of microstrip lines utilizing MIC (Microwave Integrated Circuit) technology on the PTFE-glass fibre laminate substrate. The transponder circuitry, which consists of printed antenna, microwave modem circuit and medium frequency circuit, is patterned on both surfaces of the single substrate. In this paper, operation principle, circuitry and construction of the transponder will be described.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.