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. 22, 1993
Filed:
Oct. 03, 1991
Paul T Moody, Oldham, GB;
U.S. Philips Corporation, New York, NY (US);
Abstract
A temperature responsive circuit (100) has a temperature sensitive device (1), a first current source (2) connected in series with the temperature sensitive device for generating a given current (I.sub.1) and a detector (3) having an output (4) for providing a voltage signal (V.sub.4) which varies with the temperature sensed by the temperature sensitive device (1). A current-limiting arrangement (6) is connected to the output (4) and includes a current mirror having first and second similar transistors (Q11 and Q7) with the main current path between first and second electrodes (S.sub.7 and d.sub.7) of the second transistor (Q7) providing an output current I.sub.out of the circuit. A second current source (Q10 and Q12) provides a current for the current mirror which is related to the given current (I.sub.1) when the voltage at the output of the detector (3) represents a temperature below a critical temperature (T.sub.c) and a current which drops with an increase in temperature when the temperature increases beyond the critical temperature T.sub.c to cause the output current I.sub.out of the circuit to fall with an increase in temperature beyond the critical temperature.