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:
Aug. 22, 2017
Filed:
Feb. 17, 2015
Applicant:
Sharp Kabushiki Kaisha, Sakai, Osaka, JP;
Inventor:
Seiichiro Kihara, Sakai, JP;
Assignee:
SHARP KABUSHIKI KAISHA, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 17/0812 (2006.01); H03K 17/06 (2006.01); H03K 17/04 (2006.01); H03K 3/014 (2006.01);
U.S. Cl.
CPC ...
H03K 17/08128 (2013.01); H03K 3/014 (2013.01); H03K 17/0406 (2013.01); H03K 17/063 (2013.01);
Abstract
A driver circuit includes normally-on transistors (Q, Q), control circuits () that control the transistors (Q, Q), a capacitor () connected between power source nodes () of the control circuit (), a power source () connected between power source nodes () of the control circuit (), a MOSFET () connected between the power source nodes (), a control circuit () that turns on the MOSFET () when an output voltage VO reaches approximately 0 V, and a startup circuit that includes a Zener diode () connected in parallel to the capacitor () and that can charge the capacitor () with a Zener voltage even when the MOSFET () is off.