CN115420395A - Temperature transmitting circuit - Google Patents
Temperature transmitting circuit Download PDFInfo
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- CN115420395A CN115420395A CN202211069583.4A CN202211069583A CN115420395A CN 115420395 A CN115420395 A CN 115420395A CN 202211069583 A CN202211069583 A CN 202211069583A CN 115420395 A CN115420395 A CN 115420395A
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- temperature
- resistor
- output
- sensitive resistor
- current source
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
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- General Physics & Mathematics (AREA)
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Abstract
The present application relates to a temperature transmitting circuit. The circuit comprises: the device comprises a constant current source module, a temperature acquisition module and an isolation amplifier; the temperature acquisition module is a temperature-sensitive resistor with a linear relationship between temperature and current, and the temperature-sensitive resistor is connected in series on a feedback branch of the constant current source module; the constant current source module comprises an output resistor, the output resistor is connected with the temperature-sensitive resistor in series, and the voltage drop of the output resistor is the differential input of the isolation amplifier; when the temperature collected by the temperature-sensitive resistor changes, the voltage drop of the output resistor and the resistance value of the temperature-sensitive resistor change linearly, and the isolation amplifying circuit outputs a temperature change parameter by amplifying a differential signal of the linear change. The circuit utilizes the constant current source circuit to transmit the temperature change induced by the temperature sensitive resistor to the voltage drop of other resistors for isolated output, is not influenced by the input impedance of the isolation amplifier, and can improve the accuracy of temperature measurement.
Description
Technical Field
The present application relates to the field of power electronics technologies, and in particular, to a temperature transmitting circuit.
Background
With the development of power electronic technology, a large number of temperature measurement methods using the resistance change characteristics of the temperature-sensitive resistor are currently developed, and in this way, the temperature characteristics of the temperature-sensitive resistor need to be known, and the detected resistance of the temperature-sensitive resistor is converted into a corresponding voltage, so as to monitor the temperature.
However, this method requires first detecting the resistance change and then querying the temperature characteristic of the temperature sensitive resistor to know the corresponding temperature.
Disclosure of Invention
In view of the above, it is necessary to provide a temperature transmitter circuit in order to solve the above-mentioned problems.
A temperature transmitter circuit, the circuit comprising:
the device comprises a constant current source module, a temperature acquisition module and an isolation amplifier;
the temperature acquisition module is a temperature-sensitive resistor with a linear relationship between temperature and current, and the temperature-sensitive resistor is connected in series on a feedback branch of the constant current source module;
the constant current source module comprises an output resistor, the output resistor is connected with the temperature-sensitive resistor in series, and the voltage drop of the output resistor is the differential input of the isolation amplifier;
when the temperature collected by the temperature-sensitive resistor changes, the voltage drop of the output resistor changes linearly, and the isolation amplifying circuit outputs a temperature change parameter by amplifying a differential signal of the linear change.
In one embodiment, the constant current source module includes: the circuit comprises a reference input end, an operational amplifier, an output resistor and a feedback resistor; the reference input end is connected with the positive input end of the operational amplifier; the output end of the operational amplifier is connected with one end of the output resistor, and the other end of the output resistor is connected with one end of the feedback resistor and the reverse input end of the operational amplifier; the feedback resistor is positioned on a feedback loop, and the output resistor and the temperature-sensitive resistor are connected in series through the feedback resistor.
In one embodiment, the temperature acquisition module comprises: a temperature sensitive resistor.
In one embodiment, the temperature-sensitive resistor is a negative temperature coefficient resistor.
In one embodiment, two ends of the output resistor are respectively connected with a VINP end and a VINN end of the isolation amplifier.
In one embodiment, the output resistor has a resistance of 54.9 ohms, and the feedback resistor has a resistance of 100 ohms.
In one embodiment, the isolation amplifier is model AMC1301.
Above-mentioned temperature becomes transmission circuit, at first, build the constant current source module, and regard the temperature acquisition module as the feedback end of constant current source module, can know, when the resistance value of feedback end changes, the electric current that the constant current source flows through also can change simultaneously, thereby establish the linear relation of voltage drop and the temperature acquisition module collection temperature variation on the output resistor, that is, temperature variation and the voltage drop on the output resistor are linear relation, can know, through simple linear relation solution, can know current temperature, that is, the voltage drop output of output resistor is also current temperature output, then keep apart the amplification through isolation amplifier, keep apart sense terminal and output.
Drawings
FIG. 1 is a block diagram of a temperature transmitter circuit in one embodiment;
fig. 2 is a circuit diagram of a temperature transmitter circuit in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
In one embodiment, as shown in fig. 1, there is provided a temperature transmitting circuit including:
constant current source module 100, temperature acquisition module 200 and isolation amplifier 300.
The temperature acquisition module 200 is a temperature-sensitive resistor 210 with a linear relationship between temperature and current, and the temperature-sensitive resistor 210 is connected in series to a feedback branch of the constant current source module 100.
The constant current source module 100 includes an output resistor 110, the output resistor 110 is connected in series with a temperature sensitive resistor 210, and a voltage drop of the output resistor 110 is a differential input of the isolation amplifier.
When the temperature collected by the temperature sensitive resistor 210 changes, the voltage drop of the output resistor 110 changes linearly with the resistance of the temperature sensitive resistor, and the isolation amplifying circuit 300 outputs a temperature change parameter by amplifying the linearly changed differential signal.
In the temperature transmitting circuit method, firstly, a constant current source module is built, and a temperature acquisition module is used as a feedback end of the constant current source module, so that the current flowing through a constant current source can be changed simultaneously when the resistance value of the feedback end is changed, and a linear relation between the voltage drop of an output resistor and the resistance value change of a temperature-sensitive resistor of the temperature acquisition module is built, namely, the resistance value change of the temperature-sensitive resistor caused by the temperature change and the voltage drop of the output resistor are in a linear relation.
In one embodiment, as shown in fig. 2, the constant current source module includes: the reference input end Vref, the operational amplifier, the output resistor R1 and the feedback resistor R2; the reference input end Vref is connected with the positive input end of the operational amplifier; the output end of the operational amplifier is connected with one end of the output resistor R1, and the other end of the output resistor R1 is connected with one end of the feedback resistor R2 and the reverse input end of the operational amplifier; the feedback resistor R2 is positioned on the feedback loop, and the output resistor R1 and the temperature-sensitive resistor RT are connected in series through the feedback resistor R2. In this embodiment, when the external temperature changes, the resistance of the temperature sensitive resistor RT decreases, so that the current flowing through the temperature sensitive resistor R5 increases, and correspondingly, the current flowing through the output resistor R1 increases, so that the voltage drop of the output resistor R1 changes, and the voltage drops at the two ends of the output resistor R1 are collected by the isolation amplifier, and are converted into temperature values to perform high-precision temperature transmission.
In one embodiment, the temperature acquisition module comprises: and (4) a temperature-sensitive resistor.
In one embodiment, the temperature-sensitive resistor is a negative temperature coefficient resistor. Specifically, the temperature-sensitive resistor can be an NTC temperature-sensitive resistor, the NTC temperature-sensitive resistor is a negative temperature coefficient resistor, and the characteristic that the resistance value changes along with the temperature linearly converts the change of the NTC temperature-sensitive resistor into the voltage drop of other resistors, so that accurate temperature measurement is realized.
In one embodiment, two ends of the output resistor are respectively connected with the VINP end and the VINN end of the isolation amplifier, so that the isolation amplifier can acquire the voltage drop across the output resistor.
In one embodiment, the output resistor has a resistance of 54.9 ohms and the feedback resistor has a resistance of 100 ohms.
In one embodiment, the isolation amplifier is model AMC1301.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (5)
1. A temperature transmitter circuit, the circuit comprising:
the device comprises a constant current source module, a temperature acquisition module and an isolation amplifier;
the temperature acquisition module is a temperature-sensitive resistor with resistance changing along with temperature, and the temperature-sensitive resistor is connected in series on a feedback branch of the constant current source module;
the constant current source module comprises an output resistor, the output resistor is connected with the temperature-sensitive resistor in series, and the voltage drop of the output resistor is the differential input of the isolation amplifier;
when the temperature collected by the temperature-sensitive resistor changes, the voltage drop of the output resistor linearly changes along with the resistance value of the temperature-sensitive resistor, and the isolation amplifying circuit outputs a temperature change parameter by amplifying a differential signal of the linear change.
2. The temperature transmitter circuit of claim 1, wherein the constant current source module comprises: the circuit comprises a reference input end, an operational amplifier, an output resistor and a feedback resistor;
the reference input end is connected with the positive input end of the operational amplifier;
the output end of the operational amplifier is connected with one end of the output resistor, and the other end of the output resistor is connected with one end of the feedback resistor and the reverse input end of the operational amplifier; the feedback resistor is positioned on a feedback loop, and the output resistor and the temperature-sensitive resistor are connected in series through the feedback resistor.
3. The temperature transmitting circuit according to claim 2, wherein the temperature acquisition module includes: a temperature sensitive resistor.
4. The temperature transmitter circuit according to any one of claims 1 to 3, wherein two ends of the output resistor are connected to a VINP terminal and a VINN terminal of the isolation amplifier, respectively.
5. The temperature transmitter circuit of any one of claims 1 to 3, wherein the isolated amplifier is model AMC1301.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211069583.4A CN115420395A (en) | 2022-08-31 | 2022-08-31 | Temperature transmitting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211069583.4A CN115420395A (en) | 2022-08-31 | 2022-08-31 | Temperature transmitting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN115420395A true CN115420395A (en) | 2022-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211069583.4A Pending CN115420395A (en) | 2022-08-31 | 2022-08-31 | Temperature transmitting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504983A (en) * | 2017-09-06 | 2017-12-22 | 湖南航天机电设备与特种材料研究所 | Miniature fiber gyro Y waveguide drive circuit and half-wave voltage drift compensation method |
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2022
- 2022-08-31 CN CN202211069583.4A patent/CN115420395A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504983A (en) * | 2017-09-06 | 2017-12-22 | 湖南航天机电设备与特种材料研究所 | Miniature fiber gyro Y waveguide drive circuit and half-wave voltage drift compensation method |
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