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:
Jul. 31, 1990
Filed:
Jan. 30, 1989
Toshifumi Sato, Tokyo, JP;
Motoki Ide, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A power source control apparatus for use in electronic equipment of the type including a microprocessor and a main power source in the form of a battery controls a boosting circuit which boosts the output voltage of the battery to produce an operating voltage of the equipment. Connected in parallel to the battery are the boosting circuit and a power switch for producing a power ON/OFF signal. A reset/set flip-flop is connected between the boosting circuit and the power switch. The boosting circuit is operable only when the output of the flip-flop has a set state. Even when the power ON/OFF signal becomes a low level, i.e., OFF state, the flip-flop maintains its output in a set state until a power control signal is fed thereto from the external equipment. The period of time for which the operating power should be held after the turn-off of the power switch can be freely determined to suit the external equipment. Further, a reset signal generating circuit is provided for producing a predetermined reset signal depending upon the state of the flip-flop output.