CN202255672U

CN202255672U - Temperature measuring system

Info

Publication number: CN202255672U
Application number: CN2011204067163U
Authority: CN
Inventors: 魏杰; 胡祺君; 钱卫东; 金欣
Original assignee: SUZHOU SOLAR TECHNOLOGY Co Ltd
Current assignee: SUZHOU SOLAR TECHNOLOGY Co Ltd
Priority date: 2011-10-24
Filing date: 2011-10-24
Publication date: 2012-05-30
Anticipated expiration: 2021-10-24

Abstract

The utility model provides a temperature measuring system, which is a circuit with zero temperature drift of a hardware resistance bridge and consists of a full-bridge circuit, a divider resistor R1 and a rectifying diode D1, wherein the full-bridge circuit is composed of an analog temperature sensor RT, a resistor R2, a resistor R3 and resistors R4 and R5. The resistors R2, R3, R4 and R5 form the full-bridge circuit, the resistance value change of the analog temperature sensor RT is corresponding to the voltage value change of the input end of an operational amplifier U1, and MCU (Microprogrammed Control Unit) can accurately and quickly measure the temperature value through ADC (Analog To Digital Converter) analog-digital conversion. The temperature measuring system can effectively and accurately provide the temperature value which can be processed by upper computer software, the temperature measuring system has stable measurement, sensitive temperature sensing and high measurement speed, and the operation of the upper computer software is simple and effective.

Description

A kind of temperature measurement system

Technical field

The utility model relates to a kind ofly can measure temperature at a high speed accurately, and other circuit is disturbed almost nil, can be placed on other sensors next doors and do the temperature measurement system that temperature compensation is used.

Background technology

Industry at present go up to thermometric require increasingly high, and general digital temperature sensor, such as DS18B20, measuring speed is slow, degree of accuracy is low, it is big especially small signal circuit to be disturbed, and is not accepted by industry.How could efficient, accurate, high speed is measured temperature and other circuit is not disturbed, and can use this technology.

Along with development of semiconductor; Various sensors appear in face of us, and the sensor temperature influence is a lot, how accurately to test out the signal of wanting through sensor; That must do temperature compensation to test signal, and this just needs efficiently accurately to test out temperature and does the software temperature compensation.

Electronic technology growing, the traditional hardware circuit design can't satisfy the hyundai electronics demand.

The utility model content

In order to solve the problem of above-mentioned background technology; The utility model provides a kind of temperature measurement system; Adopt MCU microprocessor ARM11 chip, adopt the curve fitting implementation algorithm to realize temperature survey, degree of accuracy can arrive 0.01 ℃; Measuring speed can reach 10us once according to the decision of ADC slewing rate.

To achieve these goals, the utility model adopts following technical scheme to be:

A kind of temperature measurement system; Said temperature measurement system is the circuit that hardware resistance bridge zero temperature is waftd; Its bridge-type circuit of being made up of analog temperature sensor RT, resistance R 2, resistance R 3, resistance R 4 and R5, divider resistance R1 and commutation diode D1 form, and said resistance R 2, R3, R4 and R5 form the bridge-type circuit, the variation of the corresponding magnitude of voltage with amplifier U1 input end of analog temperature sensor RT resistance change; Through the ADC analog-to-digital conversion, MCU just accurately high speed test go out temperature value.

Preferred said commutation diode D1 is the temperature very little commutation diode that wafts; Said temperature sensor RT is thermally sensitive resistance; Analog temperature sensor RT and R3 are connected in parallel in the circuit, and resistance R 2 equates that with resistance R 4 resistances the resistance of resistance R 3 and resistance R 5 equates.

The beneficial effect of the utility model is: can efficiently accurately provide upper software manageable temperature value; Need in the electronic system of temperature compensation algorithm most suitable at some; Brightness and wavelength such as measuring optical are to do temperature compensation; Also can use in senior thermometric instruments, its stable testing, temperature sense are responsive, measuring speed is fast, and upper computer software is simple to operate efficient.

Description of drawings

Fig. 1 is the utility model structural representation

Fig. 2 is the curve map of RT temperature sensor resistance value and temperature

Fig. 3 is the curve map between AD value and the temperature

Fig. 4 is the curve fitting figure between AD value and the temperature

Embodiment

Below in conjunction with accompanying drawing the preferred embodiment of the utility model is done to set forth in detail, thereby the protection domain of the utility model is made more explicit defining so that advantage of the utility model and characteristic can be easier to it will be appreciated by those skilled in the art that.

As shown in Figure 1 a kind of temperature test system; RT is an analog temperature sensor, is placed on sensor to be measured next door and does temperature compensation, and resistance R 2, R3, R4 and R5 form a bridge-type circuit; Eliminating the influence of temperature to resistance value, also is that a kind of hardware is realized the method that resistance zero temperature is waftd.R1 is a divider resistance, and D1 is a commutation diode, and the resistance bridge voltage is constant in a fixing magnitude of voltage, and D1 is the temperature very little commutation diode that wafts.Temperature sensor RT is thermally sensitive resistance, and RT and R3 are connected in parallel in the circuit, and R2 and R4 resistance value equate usually, and the resistance of R3 and R5 equates.Do not have on the place in circuit if the RT resistance value is infinity or RT, the magnitude of voltage that gets into amplifier U1 input end equates.The variation of the corresponding magnitude of voltage with amplifier U1 input end of RT resistance change, through the ADC analog-to-digital conversion, MCU just accurately high speed test go out temperature value.

The X axle is a resistance value among Fig. 2, and unit is ohm, and the Y axle is a temperature value, and unit is degree centigrade.This curve map is the curve that draws and according to data importing matlab inside the Datasheet of temperature sensor.

To be the RT temperature sensor get into the AD value of MCU microprocessor and the curve map between the temperature through resistance bridge, amplifier and ADC analog to digital converter to Fig. 3, and the X axle is an AD value, and the Y axle is a temperature value, like this AD value with regard to and temperature value correspondence one by one.Fig. 2 has just done the ball bearing made using analysis with matlab to Fig. 3, and ADC is the analog to digital converter of 16bits.

The resistance bridge that the temperature sensor of simulation wafts through zero temperature; Very accurate resistance value correspondence and the magnitude of voltage that gets into amplifier with the RT temperature sensor; Be converted into the AD value to resistance value through the ADC analog to digital converter again; Just the temperature value with to be measured is corresponding one by one for the AD value like this, and the MCU microprocessor is read the AD value and just can be known temperature value to be measured like this.

The above; Be merely one of embodiment of the utility model; But the protection domain of the utility model is not limited thereto; Any those of ordinary skill in the art are in the technical scope that the utility model disclosed, and variation or the replacement that can expect without creative work all should be encompassed within the protection domain of the utility model.Therefore, the protection domain of the utility model should be as the criterion with the protection domain that claims were limited.

Claims

1. temperature measurement system; It is characterized in that; Said temperature measurement system is the circuit that hardware resistance bridge zero temperature is waftd; Its bridge-type circuit of being made up of analog temperature sensor RT, resistance R 2, resistance R 3, resistance R 4 and R5, divider resistance R1 and commutation diode D1 form, and said resistance R 2, R3, R4 and R5 form the bridge-type circuit, the variation of the corresponding magnitude of voltage with amplifier U1 input end of analog temperature sensor RT resistance change; Through the ADC analog-to-digital conversion, MCU just accurately high speed test go out temperature value.

2. a kind of temperature measurement system according to claim 1; It is characterized in that; Said commutation diode D1 is the temperature very little commutation diode that wafts, and said temperature sensor RT is thermally sensitive resistance, and analog temperature sensor RT and R3 are connected in parallel in the circuit; Resistance R 2 equates that with resistance R 4 resistances the resistance of resistance R 3 and resistance R 5 equates.