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:
Jul. 01, 2008
Filed:
Nov. 13, 2006
Tooru Nakajima, Narashino, JP;
Masahiro Hiraga, Yotsukaido, JP;
Tetsuya Kimura, Chiba, JP;
Satoshi Ibori, Yachimata, JP;
Masayuki Hirota, Narashino, JP;
Tooru Nakajima, Narashino, JP;
Masahiro Hiraga, Yotsukaido, JP;
Tetsuya Kimura, Chiba, JP;
Satoshi Ibori, Yachimata, JP;
Masayuki Hirota, Narashino, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Chiba, JP;
Abstract
An object of the present invention is to lower the voltage applied to the starting resistor of the starting circuit in a switching power supply circuit to reduce the power loss especially when the receiving voltage is high and thereby provide a small and inexpensive switching power supply circuit. According to the present invention, a switching power supply circuit comprises: a DC voltage section having two or more capacitors connected in series; and a PWM control circuit for receiving DC power supply from the DC voltage section and performing switching control on a primary side of a transformer in order for the switching power supply circuit to output a DC voltage of different voltage specifications; wherein the starting resistor for the PWM control circuit is connected to a connection point of the capacitors.