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:
Apr. 18, 2017
Filed:
May. 20, 2015
Sanken Electric Co., Ltd., Niiza-shi, Saitama, JP;
Yoshimichi Tadamasa, Niiza, JP;
Sanken Electric Co., Ltd., Niiza-shi, Saitama, JP;
Abstract
A step-down chopper type switching power-supply device includes a step-down chopper circuit including an inductor connected to a switching element connected to a DC power source, a regenerative-voltage detecting circuit, a control circuit controlling the switching element such that regenerative voltage becomes a reference voltage, an auxiliary power supply circuit charging a capacitor by using the regenerative voltage and supplying the voltage of the capacitor as power-supply voltage to the control circuit, and a activation circuit stopping supply of current to the capacitor after activation of the auxiliary power supply circuit, wherein, after activation of the auxiliary power supply circuit, in a case where voltage supplied from the DC power source is equal to or less than a first threshold value, the activation circuit performs control by the voltage supplied from the DC power source, such that current is supplied to the capacitor.