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:
Jun. 08, 1993
Filed:
Aug. 07, 1991
Eiichi Sugishima, Nagoya, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A driver circuit for a half-bridge portion of an inverter device includes a upper arm driver circuit and a lower arm driver circuit for driving a upper arm IGBT and a lower arm IGBT, respectively. The lower arm driver circuit is supplied from a lower arm driver voltage source, while the upper arm driver circuit is supplied from a capacitor, which is charged by the lower arm driver voltage source via a diode and the lower arm IGBT when the lower arm IGBT is turned on. A current limiter is coupled in series with the capacitor to limit the magnitude of the initial charging current of the capacitor while the charge stored across the capacitor is null or small, such that the voltage controller for the lower arm driver voltage source is not disturbed. Alternatively, a pulse generator is provided to generate pulses which repeatedly turn on and off the lower arm driver circuit before the upper arm driver circuit and the lower arm driver circuit are driven complimentarily. In such case, the ON/OFF ratio of the pulses is preferred to increase gradually toward the completion of the initial charging of the capacitor.