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. 11, 1990
Filed:
Feb. 25, 1988
Shinya Higashi, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A switching power source apparatus of a ringing choke converter system according to the present invention includes an amplifier for outputting a voltatge to be decreased with an increase in output voltage from a switching power source apparatus, an oscillator for generating a sawtooth wave voltage, a comparator for comparing the sawtooth wave voltage output from the oscillator with the detection output voltage from the amplifier, a first control transistor for controlling the oscillator, and a second control transistor for controlling the switching transistor. When the sawtooth wave voltage is lower than the detection output voltage, the first control transistor is turned on, and the oscillator is subsequently turned on. When the sawtooth wave voltage is higher than the detection output voltage, the second control transistor is turned on, and the switching transistor is subsequently turned on. As a result, the switching frequency is set constant by decreasing the duty ratio in the small load period.