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. 23, 2000
Filed:
Jul. 29, 1998
Kuei Wei Kuo, Tainan, TW;
Analog and Power Electronics Corp., Hsinchu, TW;
Abstract
A control circuit for Hall-effect switching device is provided. The control circuit can be used in a Hall-effect switching device to control the output of the Hall-effect switching device in response to Hall effect. The control circuit comprises a current source and two pairs of symmetrically arranged bipolar junction transistors (BJT). The particular arrangement of the BJTs allow the Hall-effect sensitivity by the Hall-effect switching device to be enhanced. The Hall-effect sensitivity can be adjusted by varying the current source in the control circuit. Moreover, the control circuit is designed with a double-output feature that allows the Hall-effect switching device to be realizable with a fewer number of transistors, allowing the Hall-effect switching device to operate with a lower working current and a lower starting voltage as compared to the prior art, thus considerably reducing power consumption.