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. 04, 2008
Filed:
Apr. 11, 2005
Minkun Wang, Hsinchu, TW;
Chun-lin Shen, Hsinchu, TW;
Chi-ho Hsu, Hsinchu, TW;
Chi-bing Chen, Hsinchu, TW;
Minkun Wang, Hsinchu, TW;
Chun-Lin Shen, Hsinchu, TW;
Chi-Ho Hsu, Hsinchu, TW;
Chi-Bing Chen, Hsinchu, TW;
Holtek Semiconductor Inc., Hsinchu, TW;
Abstract
A power processing interface for a radio frequency identification system is provided. The power processing interface includes a resonance circuit for inducing a first signal transmitted from a terminal as an AC voltage, a first rectifier circuit electrically connected to the resonance circuit for converting the AC voltage into a DC voltage, a filter circuit electrically connected to the first rectifier circuit for generating an operating voltage in response to the DC voltage, a voltage-detecting circuit electrically connected to the filter circuit and the first rectifier circuit for detecting the magnitude of the operating voltage, a second rectifier circuit electrically connected to the resonance circuit, and a voltage-clamping modulation circuit electrically connected to the first rectifier circuit, the voltage-detecting circuit and the second rectifier circuit for controlling the conduction of the second rectifier circuit in response to the output of the voltage-detecting circuit so as to bypass the excessive current, and for providing a minimum voltage to the radio frequency identification system during the modulation process so as to keep the radio frequency identification system in a normal operation.