Detection circuit and method of temperature sensor

A technology of temperature sensor and detection circuit, applied in the direction of thermometer testing/calibration, thermometer, instrument, etc., can solve the problems of high requirements of test bench software and hardware, and achieve low implementation cost, convenient implementation, high stability and reliability. Effect

Inactive Publication Date: 2011-10-05
SHANGHAI BEHR THERMAL SYST
View PDF2 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a measurement method needs to accurately measure the ambient temperature, and needs to calculate the upper and lower limits of the theoreti

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Detection circuit and method of temperature sensor
  • Detection circuit and method of temperature sensor

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] like figure 1 as shown, figure 1 A preferred embodiment of a detection circuit of a temperature sensor of the present invention is shown. This embodiment includes a measured temperature sensor Rx, a standard sample temperature sensor R1, a second resistor R2, a third resistor R3 and a power supply E, and is characterized in that: the standard sample temperature sensor R1, the second resistor R2, the third resistor R3 and The measured temperature sensor Rx forms a single-arm bridge, wherein the bridge arm of the measured temperature sensor Rx is opposite to the bridge arm of the third resistor R3, and the bridge arm of the second resistor R2 is opposite to the bridge arm of the standard temperature sensor R1; The first connection point c between the temperature sensor Rx and the standard temperature sensor R1, the second connection point d between the second resistor R2 and the third resistor R3 form the output of the single-arm bridge, and the detection circuit also in...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Resistanceaaaaaaaaaa
Login to view more

Abstract

The invention discloses a detection circuit and method of a temperature sensor, wherein the detection circuit comprises or relates to a temperature sensor Rx to be detected, an analog quantity input module, a programmable logic controller PLC (programmable logical controller) and a power supply E, and further comprises a Wheatstone bridge consisting of a sample temperature sensor R1, a second resistor R2, a third resistor R3 and the detected temperature sensor Rx. The detection circuit and method of the temperature sensor in the invention overcome the influence of the change of ambient temperature on the test result. According to the invention, the judgment range for detection can be reduced from the range of the detected temperature sensor Rx from 770Omega to 3378Omega, to the range froma resistance difference value plus 200Omega to the resistance difference value minus 200 (corresponding to 0.5V output voltage of the Wheatstone bridge and below), wherein the resistance difference value is between the detected temperature sensor and the sample temperature sensor R1, thereby sufficiently implementing efficient test on the stability and reliability of the detected temperature sensor. The detection circuit and method of the temperature sensor are convenient in implementation, low in implementation cost and very suitable for workshop online test.

Description

technical field [0001] The invention relates to a detection circuit and method of a temperature sensor, in particular to a detection circuit and method of a temperature sensor on an automobile air conditioner. Background technique [0002] There are many temperature sensors installed on the car air conditioner. These temperature sensors are an important basis for the control and adjustment of the air conditioner by the vehicle controller. Therefore, in the final inspection of the air-conditioning assembly, the detection of the temperature sensor is particularly important. [0003] In the prior art, a general measuring circuit of a programmable logic controller (PLC) is usually used to detect resistance performance. The method is to directly apply a voltage at both ends of the temperature sensor under test, read the current value passing through the temperature sensor under test, calculate to obtain the resistance value of the temperature sensor under test, and then compare ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01K15/00
Inventor 王怡宁叶学敏夏雅
Owner SHANGHAI BEHR THERMAL SYST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap