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. 15, 2004
Filed:
Nov. 19, 2002
Toshikazu Nagaki, Hirakata, JP;
Yoshio Mizutani, Tsu, JP;
Matsushita Electric Co., Ltd., Osaka, JP;
Abstract
A DC—DC conversion switching power supply is provided, including a plurality of DC—DC converters connected in parallel. A three-times frequency waveform which is generated from a three-times frequency waveform generation circuit, and is in sync with an oscillation frequency of the DC—DC converters is superimposed on a control voltage which is compared with a switching current signal in a current mode control circuit for controlling the DC—DC converters, or a signal proportional to the switching current signal to control a switching current pulse. Since superimposing the three-times frequency waveform which falls over one period increases the control voltage decreased by switch-on noise of the other DC—DC converter, malfunction at a switch-on phase of the other DC—DC converter, caused by the decrease of the control pulse width, is prevented.