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. 23, 1987
Filed:
Apr. 01, 1985
Lawrence J Mione, Brentwood, NY (US);
Voltec Corporation, Plainview, NY (US);
Abstract
A switching control circuit has first and second output terminals, the first output terminal being connected by way of a control resistor to one of a pair of input terminals which, in use of the circuit are connected to an electrical power source, the second output terminal being connected to the other input terminal. A sensing and delay portion of the circuit is connected across the resistor and, in response to current flowing through the resistor when the power switch of a first electrical device, such as a disc drive, connected to the input terminals is initially turned on, energizes a relay after a predetermined time delay elapses from the time that the resistor current reaches a given threshold value, the energized relay serving to connect one or more pairs of other output terminals of the circuit across the pair of input terminals, so that source power will then be supplied via the relay to the other output terminal pairs and to any other electrical devices, such as a monitor, printed and computer, whose power input terminals are respectively connected thereto. Following turn-off of the power switch, the same circuit portion deenergizes the relay after a second predetermined time delay elapses from the time that resistor current diminishes to a second given threshold value, so that source power to the other electrical devices will cease. Use of a high gain amplifier at the input of the sensing and delay portion of the circuit sharply reduces the power dissipation required of the resistor for any given threshold value of current therethrough, thus providing consequent cool operation and avoiding fuse or other line protection.