Detection circuit for detecting signals produced by bridge circuit sensor

Patent metadata

Field	Value
Publication number	US-9103695-B2
Application number	US-201213610775-A
Country	US
Kind code	B2
Filing date	Sep 11, 2012
Priority date	Feb 13, 2012
Publication date	Aug 11, 2015
Grant date	Aug 11, 2015

Abstract

A detection circuit includes an amplifier circuit, a rechargeable unit, a first comparator, a second comparator, a reference voltage providing circuit, a first resistor R 1 , a second resistor R 2 , and a processing unit. The amplifier circuit is connected to a bridge circuit sensor and amplifies signals output by the bridge circuit sensor to an output voltage Vo. The reference voltage providing circuit provides a reference voltage Vref 1 . A charge current of the rechargeable unit is (Vref 1 −V 0 )/(R 1 +R 2 ), and a discharge current is (Vref 1 −VCC)/R 1 . The processing unit controls the rechargeable unit to be charged for a time period T 1 and to be discharged during a time period T 2 . The processing unit then calculates the output voltage Vo according to an equation: (Vref 1 −V 0 )×T 1 /(R 1 +R 2 )=(Vref 1 −VCC)×T 2 /R 1 , and obtains the signals according to the output voltage Vo.

First claim

What is claimed is:

1. A detection circuit for detecting signals produced by a bridge circuit sensor, comprising:
an amplifier circuit, configured to amplify the signals produced by the bridge circuit sensor and output an output voltage Vo corresponding the signals;
a first resistor R 1 and a second resistor R 2 ;
a first comparator comprising a first inverting input port, a first non-inverting input port, and a first output port;
a second comparator comprising a second inv…

Assignees

• Yu qi-long
• Fu Tai Hua Ind Shenzhen Co Ltd
• Hon Hai Prec Ind Co Ltd

Inventors

• Yu qi-long

Classifications

• G01D3/02 Primary

  Physics · mapped topic