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:
Mar. 02, 2004
Filed:
Aug. 07, 2001
Johannes A. C. Misdom, Eindhoven, NL;
Johannes L. M. Verhees, Valkenswaard, NL;
Jozef J. M. Hulshof, Waalre, NL;
Frank J. P. Van Rens, Horst, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A two-terminal switch circuit ( ) for periodically energizing a load ( ) from a voltage supply includes a controllable switch ( ) connected between the switch terminals ( ), a resistance ( ) and a capacitor ( ) connected in series between the terminals ( ), and a voltage threshold responsive arrangement ( ) having a hysterisis characteristic. The voltage threshold responsive arrangement has a signal input ( ) and a power supply input ( ) connected to the common point ( ) of the resistance and the capacitor, and a signal output ( ) connected to a control input ( ) of the controllable switch. The voltage threshold responsive arrangement is powered by the capacitor voltage. The threshold responsive arrangement closes the switch when the capacitor charges to a first threshold voltage and opens the switch when the capacitor thereafter discharges to a second threshold voltage which is lower than the first threshold voltage.