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. 17, 1997
Filed:
Mar. 17, 1995
Hosei Hirano, Kawasaki, JP;
Tetsuro Tanaka, Kagoshima, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
A switching regulator including: a switching element connected to an input DC signal and operating for turning-on and -off the input DC signal to produce an AC signal such as a rectangular wave signal; a rectifier for rectifying the AC signal thereby generating an output voltage; a circuit for producing a frequency-variable triangular wave signal having a constant amplitude; a comparator for comparing the triangular wave signal with the output voltage of the rectifier thereby obtaining a pulse-width modulated signal used for controlling the operation of the switching element; a modulation signal generator for generating a modulation signal having an amplitude variable in asynchronism with the frequency of the triangular wave signal; a sampling and holding circuit for sampling the modulation signal at a timing in synchronism with the frequency of the triangular wave signal or preferably at the timing of a maximum or minimum value of the triangular wave signal and holding the sampled modulation signal; and a circuit for modulating the frequency of the triangular wave signal preferably within a range of about 0.8 to 1.2 times of a predetermined center frequency based on the voltage value of the modulation signal as sampled and held.