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:
Jun. 02, 1992
Filed:
Mar. 15, 1990
Takaaki Ishii, Sagamihara, JP;
Masayuki Sakanishi, Hino, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
Improvements to a power supply backup circuit used to backup the operation of a radio device or the like when a power supply therefor is interrupted. A reverse current preventing diode is connected such that its anode is connected to the junction point of a DC power source and a voltage stabilizing circuit and such that its cathode is connected to the stabilizing circuit. A transistor is provided which has a collector connected to the cathode of the diode, an emitter connected to one end of a capacitor, the other end of which is grounded, and a base connected to a DC power source via a first resistor, and which has a second resistor connected across the base and emitter thereof. A third resistor is further connected across the collector and emitter of the transistor.