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. 30, 2014
Filed:
May. 19, 2011
Tetsuya Niijima, Niiza, JP;
Hiroyuki Chikashige, Niiza, JP;
Tetsuya Niijima, Niiza, JP;
Hiroyuki Chikashige, Niiza, JP;
Sanken Electric Co., Ltd., Niiza-Shi, JP;
Abstract
In a direct-current power supply device that includes a smoothing capacitor C, which performs a DC/DC converter operation, a transformer T, a switching element Q, a diode D, a smoothing capacitor C, a reactor L, which performs a PFC operation, a fast recovery diode Dand a switching element Q, when compared with the case of a rated load, the voltage of the smoothing capacitor Cof a PFC circuit rises at a time when a load is light. Therefore, the following has been required: a capacitor having a sufficient withstanding voltage rating, or an operation of connecting a plurality of capacitors in series or any other operation to secure a voltage-withstanding capability. A direct-current power supply device, in which a switching element Qused by a PFC circuit is shared as a switching element Qby a DC/DC converter, includes voltage suppression means (switching elements Qand Qand resistance R) for supplying electric charge accumulated in a smoothing capacitor Cto a power supply Vcc of a control circuit CTLthat controls the switching element Qat a time when a load is light in order to suppress a rise in voltage in the smoothing capacitor C