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. 17, 1982
Filed:
May. 15, 1980
James A Davis, Glen Ellyn, IL (US);
William F MacPherson, Winfield Township, DuPage County, IL (US);
Harry E Mussman, Glen Ellyn, IL (US);
Peter W Shackle, Bridgewater, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
To switch a first gated diode switch (GDS1) to the 'OFF' state requires a voltage applied to the gate which is more positive than that of the anode or cathode and a sourcing of current into the gate of substantially the same order of magnitude as flows between the anode and cathode of the first switch. Control circuitry, which uses a second gated diode switch (GDSC) coupled by the cathode to the gate of the first switch (GDS1), is used to control the state of the first switch (GDS1). The control circuitry comprises a first branch circuit coupled to the gate of GDSC and to a first potential source +V1, a second branch circuit coupled to the anode of GDSC and to a second potential source +V2, and a third branch circuit coupled to the anode of GDSC and to a third potential source +V3. The first branch circuit is connected to the gate of the second switch (GDSC) and controls the state thereof. The second branch circuit maintains the state of the load switch (GDS1) and is adapted to supply up to a preselected maximum amount of current into the anode of GDSC and then to automatically reduce the amount of supplied current substantially. The third branch circuit is used to provide a surge of current during a current break operation to turn GDS1 to an OFF state.