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:
Sep. 04, 2001
Filed:
Jan. 12, 2000
Applicant:
Inventors:
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H 3/00 ;
U.S. Cl.
CPC ...
H02H 3/00 ;
Abstract
In a switch driver, a pnp transistor turns ON or OFF the passage of the charging current. Resistors are commonly connected to a base of the pnp transistor. Npn transistors are provided in such a way that their collectors are connected to each of the resistors and their emitters are grounded. Bases of each of npn transistors are connected to a control unit. This control unit subsequently turns ON each of the npn transistors so that a base current required for turning ON the pnp transistor flows. Since the base current rises slowly, an abrupt rise of the switching current in a switch driver can be prevented.