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:
Jan. 01, 1985
Filed:
Jun. 03, 1982
Michimasa Horiuchi, Katsuta, JP;
Hiroshi Sato, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A chopper control apparatus comprises a chopper connected between a d.c. power supply source and a load, and a computer for performing an arithmetic operation for controlling the duty factor of the chopper. The computer responds to a clock signal supplied thereto at a predetermined period and arithmetically determines a desired duty factor of the chopper for every period. A turn-on signal generated in synchronism with the clock signal and a turn-off signal generated with a delay of period of time based on the results of the arithmetic operation are sequentially supplied to the chopper. The conducting state of the chopper is detected and the result of the detection is fetched by the computer with a predetermined time delay. The computer executes a program for determining presence or absence of a commutation failure on the basis of the result of the conducting state detection in response to the clock signal serving as an interrupt request signal.