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:
May. 07, 2002
Filed:
Mar. 21, 2001
STMicroelectronics S.r.l., Agrate Brianza, IT;
Abstract
A feedback control circuit is for the current in a load formed by a winding in series with a current sensing resistor, coupled to a full-bridge output stage, an amplifier coupled to the terminals of the sensing resistor, and a controller fed with the output of the amplifier and with a voltage reference and producing a correction signal. The circuit has a PWM converter for generating a pair of control signals. The PWM converter includes an up/down counter producing a count value and logic circuitry that produces the twos-complement of the correction signal. A pair of registers are coupled to the outputs of the controller and of the logic circuitry. A first comparator coupled to the outputs of the counter and of the first register produces the first control signal, if the count signal exceeds the value stored in the first register. A second comparator coupled to the counter and to the second register produces the second control signal, if the count signal overcomes the value stored in the second register.