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. 11, 1994
Filed:
Aug. 26, 1992
Fumio Kato, Kadoma, JP;
Sigeo Akiyama, Kadoma, JP;
Masahiro Izumi, Kadoma, JP;
Noriteru Furumoto, Kadoma, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
A solid state relay circuit includes a MOSFET receiving a photovoltaic output generated across a photovoltaic diode array responsive to a light signal from a light emitting element, a control electrode of a normally ON type driving transistor made to be at a high impedance state by a voltage generated across an impedance element connected in series to the photovoltaic diode array upon application of the photovoltaic output across the gate and source of the MOSFET and at a low impedance state upon disappearance of the photovoltaic output is connected to a connecting point between the diode array and the impedance element, and the driving transistor is connected across the gate and source of the MOSFET with a resistor interposed. A falling gradient of output signal upon being turned OFF of the relay circuit is made thereby sufficiently gentle, and relay operation upon being turned OFF can be minimized in response time.