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:
Jul. 27, 2004
Filed:
Nov. 30, 1999
Tan Du, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A circuit model ( ) for use in analyzing a VCM circuit has a first resistor ( ), a first inductor ( ), a second inductor ( ), and a voltage source ( ), in series modeling, respectively, a VCM inductor, a winding leakage inductance of the VCM inductor, a VCM inductor resistance, and a BEMF voltage generated across the VCM inductor when the input nodes are open circuited. An input capacitor ( ) interconnects the input terminals ( ) to model an equivalent capacitance of the VCM inductor. Third and fourth inductors ( ) and a second resistor ( ) are connected in a first series loop ( ) inductively coupled to the second inductor ( ) to model, respectively, an inductance of the top VCM magnet plate, the leakage inductance of the top VCM magnet plate, and a resistance of the top VCM magnet plate. Fifth and sixth inductors ( ) and a third resistor ( ) are connected in a second series loop inductively coupled to the second inductor ( ) to model, respectively an inductance of the bottom VCM magnet plate, the leakage inductance of the bottom VCM magnet plate, and the resistance of said top VCM magnet plate.