The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 1994
Filed:
Feb. 28, 1992
Shoichi Furuhata, Kawasaki, JP;
Fuji Electric Co. Ltd., Kanagawa, JP;
Abstract
A semiconductor switching device including a first IGBT and a second IGBT connected in parallel The first IGBT has a low saturation voltage and a long fall time, whereas the second IGBT has a high saturation voltage and a short fall time. An input resistor is connected to the gate of the second IGBT, and a common drive signal is applied to a gate of the first IGBT, and to a gate of the second IGBT through the input resistor. The cutoff of the second IGBT is delayed when the first and second IGBTs are driven by the common drive signal so that the semiconductor switching device is turned off in the short fall time of the second IGBT. The switching speed is increased and the switching loss is decreased. Only a single drive circuit is enough for driving the device, enabling the miniaturization and low cost of the driving circuit.