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:
Jan. 29, 1985
Filed:
May. 16, 1983
Applicant:
Inventor:
Walter R Davis, Sunnyvale, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
363 49 ; 363 21 ;
Abstract
A switching regulator is provided with a separate or isolated d-c output for operating the switching pulse generating circuits. A large value resistor coupled between the d-c input line and the isolated d-c output will charge the filter capacitor to a higher than normal voltage. A zener diode string is coupled across the filter capacitor. The zener diodes in combination have a higher than nominal zener voltage. The diodes will respond to the capacitor voltage and develop a starting pulse that initiates the power supply when it is first energized.