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. 15, 2010
Filed:
Nov. 30, 2007
Christian Klapf, Graz, AT;
Guenter Hofer, St. Oswald, AT;
Markus Auer, Graz, AT;
Infineon Technologies AG, Neubiberg, DE;
Abstract
A circuit having a first input and a second input configured to apply an alternating voltage, a first output and a second output configured to supply a rectified and regulated voltage, a rectifier bridge circuit having a current return circuit, a third transistor and a fourth transistor, and a controller configured to regulate the voltage between the first and the second output to a constant value. The current return circuit is connected to the first input, the second input and to the second output. The third transistor is configured as a series voltage regulator and is connected to the first input and the first output. The fourth transistor is configured as a series voltage regulator and is connected to the second input and the first output. The controller is coupled to a control input of the third transistor and to a control input of the fourth transistor. Further, a method for rectifying and regulating voltages of a circuit is provided. The circuit and the method can be used in a contactless chip card.