CN216081819U - Temperature acquisition circuit and device - Google Patents
Temperature acquisition circuit and device Download PDFInfo
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- CN216081819U CN216081819U CN202122382402.0U CN202122382402U CN216081819U CN 216081819 U CN216081819 U CN 216081819U CN 202122382402 U CN202122382402 U CN 202122382402U CN 216081819 U CN216081819 U CN 216081819U
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Abstract
A temperature acquisition circuit and device, the temperature acquisition circuit includes: a plurality of temperature detection units, each for converting a detected temperature into a voltage signal; the voltage conditioning circuits are used for amplifying the voltage signals output by the temperature detection unit; the selection unit is used for outputting the largest voltage signal in the voltage signals input by the voltage conditioning circuits; the voltage-frequency conversion circuit is used for converting the voltage signal input by the selection unit into a frequency signal; and the optical module driving circuit is used for adjusting the sending state of the light emitting module according to the frequency signal. The utility model realizes the selection of the output voltages of the plurality of voltage conditioning circuits through the selection unit, thereby outputting the maximum voltage signal and obtaining the frequency signal corresponding to the highest temperature through the voltage-frequency conversion circuit. The light emitting module can be driven to work according to the frequency signal, and ultra-long distance transmission is achieved by using the optical signal.
Description
Technical Field
The utility model belongs to the field of industrial control, and particularly relates to a temperature acquisition circuit and a temperature acquisition device.
Background
With the rapid development of the industry, the scale of the industry is getting larger and larger, and the electronic technology is also rapidly developed. In the field of electronics, temperature sensing is one of the most common technologies, and is often used in products and in manufacturing. Generally, in order to ensure the accuracy of temperature detection, temperature detection needs to be performed on a plurality of positions of the same product at the same time, and then the measured highest temperature is used as the real temperature, so that the situation that the potential risk cannot be found timely and even accidents are caused due to the fact that the wrong temperature is obtained due to inaccurate detection positions is avoided.
At present, the highest temperature data obtained from a plurality of collected temperature data is basically obtained by using a controller to perform logical operation, which causes higher cost, and when the obtained highest temperature data is transmitted, the data is easily subjected to external electromagnetic interference, which causes data distortion.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a temperature acquisition circuit, which solves the problems of high temperature acquisition cost and easy interference. The utility model also provides a temperature acquisition device.
According to an embodiment of the first aspect of the utility model, the temperature acquisition circuit comprises:
the temperature detection units are respectively provided with two output ends, and are used for converting the detected temperature into a voltage signal and outputting the voltage signal together through the two output ends of the temperature detection units;
the voltage conditioning circuits are provided with output ends and two input ends, the voltage conditioning circuits are arranged in one-to-one correspondence with the temperature detection units, the two input ends of each voltage conditioning circuit are respectively connected with the two output ends of the corresponding temperature detection unit in one-to-one correspondence, and each voltage conditioning circuit is used for amplifying a voltage signal output by the temperature detection unit;
the voltage regulation circuit comprises a selection unit and a control unit, wherein the selection unit is provided with an output end and a plurality of input ends, the plurality of input ends of the selection unit are respectively connected with the output ends of the plurality of voltage regulation circuits in a one-to-one correspondence mode, and the selection unit is used for outputting the largest voltage signal in the voltage signals input by the plurality of voltage regulation circuits;
the input end of the voltage-frequency conversion circuit is connected with the output end of the selection unit and is used for converting the voltage signal input by the selection unit into a frequency signal;
and the input end of the optical module driving circuit is connected with the output end of the voltage-frequency conversion circuit, the output end of the optical module driving circuit is used for connecting the light emitting module, and the optical module driving circuit is used for adjusting the sending state of the light emitting module according to the frequency signal.
The temperature acquisition circuit provided by the embodiment of the utility model at least has the following technical effects: the temperature of multiple points can be collected and converted into corresponding voltage signals through a plurality of temperature detection units. The converted voltage signal can be preprocessed through the voltage conditioning circuit so as to ensure the accuracy of subsequent voltage-frequency conversion. The selection unit realizes the selection of the output voltages of the voltage conditioning circuits, so that the maximum voltage signal is output, the frequency signal corresponding to the highest temperature can be obtained through the voltage-frequency conversion circuit, and the anti-interference capability in subsequent transmission can be improved by converting the voltage signal into the frequency signal. The optical module driving circuit can utilize the frequency signal to conduct and cut off the optical transmitting module, so that the electric signal is converted into the optical signal, the ultra-long distance transmission is realized, the electromagnetic interference in the transmission process is effectively avoided, and the accuracy of data is ensured.
According to some embodiments of the utility model, each of the temperature detecting units comprises:
one end of the thermistor is used for connecting a first working power supply, and the other end of the thermistor is connected with one input end of the voltage conditioning circuit;
one end of the first resistor is connected with one end of the thermistor, and the other end of the first resistor is connected with the other input end of the voltage conditioning circuit;
one end of the second resistor is connected with the other end of the thermistor, and the other end of the second resistor is used for being connected with a ground wire;
and one end of the third resistor is connected with the other end of the first resistor, and the other end of the third resistor is connected with the ground wire.
According to some embodiments of the utility model, the thermistor employs an NTC resistor.
According to some embodiments of the present invention, the selection unit includes a plurality of diodes whose number is consistent with that of the voltage conditioning circuits, anodes of the plurality of diodes are respectively connected to output terminals of the plurality of voltage conditioning circuits in a one-to-one correspondence, and cathodes of the plurality of diodes are connected to input terminals of the voltage-to-frequency conversion circuit.
According to some embodiments of the utility model, the voltage conditioning circuit comprises:
a fourth resistor is connected between the positive input end of the first operational amplifier unit and one output end of the temperature detection unit, a fifth resistor is connected between the negative input end of the first operational amplifier unit and the other output end of the temperature detection unit, and a sixth resistor is connected between the output end and the negative input end of the first operational amplifier unit;
and a seventh resistor is connected between the positive input end of the second operational amplifier unit and the output end of the first operational amplifier unit, an eighth resistor is connected between the negative input end of the second operational amplifier unit and the cathode of the diode, and the output end of the second operational amplifier unit is connected with the anode of the diode.
According to some embodiments of the present invention, the selection unit further includes a plurality of output resistors, and the plurality of output resistors are connected between the cathodes of the plurality of diodes and the input terminal of the voltage-to-frequency conversion circuit in a one-to-one correspondence.
According to some embodiments of the present invention, the temperature acquisition circuit further includes a filter capacitor, one end of the filter capacitor is connected to the output end of the selection unit, and the other end of the filter capacitor is used for connecting to a ground line.
According to some embodiments of the utility model, the voltage to frequency conversion circuit comprises:
one end of the first reference resistor is used for being connected with a first working power supply;
one end of the second reference resistor is connected with the other end of the first reference resistor, and the other end of the second reference resistor is used for being connected with a ground wire;
a third reference resistor having one end connected to the other end of the first reference resistor;
the fourth reference resistor is connected between the other end of the third reference resistor and the ground wire;
a fifth reference resistor, one end of which is connected to the other end of the third reference resistor;
the reference capacitor is connected with the fifth reference resistor in parallel;
and the voltage-frequency conversion chip is provided with a voltage trigger end, a pulse voltage output end, a pulse current output end and a monostable trigger pulse input end, wherein the voltage trigger end of the voltage-frequency conversion chip is connected with the output end of the selection unit, the pulse voltage output end is connected with the input end of the optical module driving circuit, and the pulse current output end and the monostable trigger pulse input end are both connected with the other end of the fifth reference resistor.
According to some embodiments of the utility model, the light module driving circuit comprises:
one end of the first driving resistor is connected with the output end of the voltage-frequency conversion circuit;
the grid electrode of the switching tube is connected with the other end of the first driving resistor, the source electrode of the switching tube is connected with a ground wire, and the drain electrode of the switching tube is connected with the light emitting module;
and the second driving resistor is connected between the grid electrode and the source electrode of the switching tube.
According to a second aspect of the utility model, the temperature acquisition device comprises:
a temperature acquisition circuit as described above;
and the positive input end of the light emitting module is connected with a second working power supply, and the negative input end of the light emitting module is connected with the output end of the optical module driving circuit.
The temperature acquisition device provided by the embodiment of the utility model at least has the following technical effects: the selection of the highest temperature can be realized through the temperature acquisition circuit, the highest temperature data can be converted into corresponding frequency signals, the light emission module can be conducted and cut off by utilizing the frequency signals, light signals corresponding to the frequency of the frequency signals are emitted, and the purpose of long-distance temperature acquisition and transmission is achieved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic circuit diagram of a temperature detection unit, a voltage conditioning circuit, and a selection unit according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of a voltage to frequency conversion circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an optical module driving circuit according to an embodiment of the present invention;
FIG. 4 shows the frequency signal (low temperature) converted by the voltage-to-frequency conversion circuit according to the embodiment of the present invention;
fig. 5 shows a frequency signal (high temperature) converted by the voltage-to-frequency conversion circuit according to an embodiment of the present invention.
Reference numerals:
the temperature detection unit 100, the voltage conditioning circuit 200, the selection unit 300, the voltage-to-frequency conversion circuit 400, the optical module driving circuit 500, and the optical transmission module 600.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the directional descriptions, such as the directions of upper, lower, front, rear, left, right, etc., are referred to only for convenience of describing the present invention and for simplicity of description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
A temperature acquisition circuit according to an embodiment of the present invention is described below with reference to fig. 1 to 5.
The temperature acquisition circuit according to the embodiment of the first aspect of the present invention includes a selection unit 300, a voltage-to-frequency conversion circuit 400, a light module driving circuit 500, a plurality of temperature detection units 100, and a plurality of voltage conditioning circuits 200.
A plurality of temperature detecting units 100, each temperature detecting unit 100 having two output ends, each temperature detecting unit 100 being configured to convert the detected temperature into a voltage signal and output the voltage signal from the two output ends of the temperature detecting unit 100;
the voltage detection circuit comprises a plurality of voltage conditioning circuits 200, wherein each voltage conditioning circuit 200 is provided with an output end and two input ends, the voltage conditioning circuits 200 are arranged in one-to-one correspondence with a plurality of temperature detection units 100, the two input ends of each voltage conditioning circuit 200 are respectively connected with the two output ends of the corresponding temperature detection unit 100 in one-to-one correspondence, and each voltage conditioning circuit 200 is used for amplifying a voltage signal output by the temperature detection unit 100;
the selection unit 300 has an output end and a plurality of input ends, the plurality of input ends of the selection unit 300 are respectively connected with the output ends of the plurality of voltage conditioning circuits 200 in a one-to-one correspondence manner, and the selection unit 300 is configured to output a largest voltage signal among the voltage signals input by the plurality of voltage conditioning circuits 200;
a voltage-to-frequency conversion circuit 400, an input end of which is connected to an output end of the selection unit 300, for converting the voltage signal input by the selection unit 300 into a frequency signal;
the input end of the optical module driving circuit 500 is connected to the output end of the voltage-to-frequency conversion circuit 400, the output end is used for connecting the optical transmitter module 600, and the optical module driving circuit 500 is used for adjusting the transmitting state of the optical transmitter module 600 according to the frequency signal.
Referring to fig. 1 to 3, a plurality of temperature detecting units 100 may be disposed at different positions, so that temperature information of different positions may be collected, and the temperature information may be further converted into voltage signals, where different temperature information corresponds to different voltage signals. After the voltage signal is input to the corresponding voltage conditioning circuit 200, the voltage signal is amplified by the voltage conditioning circuit 200, so that the voltage signal received by the subsequent voltage-frequency conversion circuit 400 can be converted into an effective frequency signal. The voltage conditioning circuits 200 output amplified voltage signals, the amplified voltage signals are input to the selection unit 300, the selection unit 300 selects a voltage signal with the largest amplitude from the amplified voltage signals, and further transmits the voltage signal to the voltage-to-frequency conversion circuit 400, the voltage-to-frequency conversion circuit 400 converts the voltage signal into a corresponding frequency signal, the frequency signal output by the voltage-to-frequency conversion circuit 400 is substantially a pulse signal with different frequencies, and the frequency of the output frequency signal is different due to different temperatures, generally speaking, the higher the temperature is, the lower the corresponding frequency is, as shown in fig. 4 and 5, the higher the input temperature is, the time is represented by the abscissa and the amplitude is represented by the ordinate in fig. 4 and 5, and the length of the time represented by each grid in the abscissa in fig. 4 and 5 is the same. The output frequency signal is further input to the optical module driving circuit 500, the optical module driving circuit 500 controls the light emitting module 600 to emit an optical signal with the same frequency according to the frequency of the frequency signal, and the optical signal can be transmitted through an optical cable in a long distance.
According to the temperature acquisition circuit of the embodiment of the utility model, the temperatures of multiple points can be acquired and converted into corresponding voltage signals by the multiple temperature detection units 100. The voltage conditioning circuit 200 can preprocess the converted voltage signal to ensure the accuracy of the subsequent voltage-to-frequency conversion. The selection unit 300 selects the output voltages of the plurality of voltage conditioning circuits 200, so as to output the maximum voltage signal, obtain a frequency signal corresponding to the highest temperature through the voltage-to-frequency conversion circuit 400, and convert the voltage signal into the frequency signal, thereby improving the anti-interference capability in subsequent transmission. The optical module driving circuit 500 can utilize the frequency signal to conduct and turn off the optical transmitting module 600, thereby realizing conversion of an electrical signal into an optical signal, realizing ultra-long distance transmission, effectively avoiding electromagnetic interference in a transmission process and ensuring accuracy of data.
In some embodiments of the present invention, referring to fig. 1, each of the temperature detecting units 100 includes: the thermistor comprises a thermistor NTC, a first resistor R28, a second resistor R35 and a third resistor R36. A thermistor NTC, one end of which is used for connecting a first working power source VREF10V, and the other end of which is connected with one input end of the voltage conditioning circuit 200; a first resistor R28, one end of which is connected to one end of the thermistor NTC and the other end of which is connected to the other input end of the voltage conditioning circuit 200; one end of the second resistor R35 is connected with the other end of the thermistor NTC, and the other end of the second resistor R35 is used for being connected with a ground wire; one end of the third resistor R36 is connected to the other end of the first resistor R28, and the other end is connected to ground.
Referring to fig. 1, the thermistor NTC, the first resistor R28, the second resistor R35, and the third resistor R36 form an electrical bridge, and when the temperature of the detected point changes, the resistance of the thermistor NTC changes, which causes a change in the voltage signal output from the electrical bridge to the first operational amplifier unit U8C, and the change in the voltage signal can effectively reflect the change in the temperature.
In some embodiments of the utility model, the thermistor NTC is a negative temperature coefficient thermistor, i.e. an NTC resistor. Compared with the PTC resistor, the NTC resistor has higher sensitivity, better accuracy and better response temperature change.
In some embodiments of the present invention, referring to fig. 1, the selecting unit 300 includes a plurality of diodes D1 in a number consistent with the number of the voltage conditioning circuits 200, anodes of the diodes D1 are respectively connected to the output terminals of the voltage conditioning circuits 200 in a one-to-one correspondence, and cathodes of the diodes D1 are all connected to the input terminal of the voltage-to-frequency conversion circuit 400. The NTC resistors detect different temperatures, so that the resistance values are different, and further, the voltage signals output by the voltage conditioning circuits 200 are different, each voltage signal needs to pass through one diode D1 to be output to the voltage-to-frequency conversion circuit 400, and because of the existence of the diode D1, only the voltage conditioning circuit 200 with the largest amplitude of the output voltage signal can output to the voltage-to-frequency conversion circuit 400, so that the purpose of selecting the highest temperature is achieved.
Specifically, taking the two temperature detecting units 100 and the voltage conditioning circuit 200 as an example, assuming that the amplitude of the voltage signal output by the first voltage conditioning circuit 200 is V1, the amplitude of the voltage signal output by the second voltage conditioning circuit 200 is V2, and V1 is greater than V2, for the second voltage conditioning circuit 200, the anode voltage of the diode D1 connected thereto is V2, and the cathode is V1, which inevitably causes the diode D1 to be turned on, so that the voltage of the V1 that the second voltage conditioning circuit 200 needs to output cannot be output, and thus only the first voltage conditioning circuit 200 can output V1. Similarly, when there are multiple voltage conditioning circuits 200, only the path with the largest voltage signal amplitude can be output to the voltage-to-frequency conversion short circuit due to the presence of the diode D1. The diode D1 is skillfully utilized as a selection voltage signal, so that compared with the traditional control chip for logic operation selection, the cost is lower, the real-time performance is higher, and the stability is higher.
In some embodiments of the present invention, referring to fig. 1, a voltage conditioning circuit 200 includes: a first operational amplifier unit U8C and a second operational amplifier unit U8A. A fourth resistor R38 is connected between the positive input end of the first operational amplifier unit U8C and one output end of the temperature detection unit 100, a fifth resistor R42 is connected between the negative input end and the other output end of the temperature detection unit 100, and a sixth resistor R44 is connected between the output end and the negative input end; a seventh resistor R40 is connected between the positive input end of the second operational amplifier unit U8A and the output end of the first operational amplifier unit U8C, an eighth resistor R23 is connected between the negative input end and the cathode of the diode D1, and the output end is connected with the anode of the diode D1.
The operational amplifier circuit formed by taking the first operational amplifier unit U8C as a core can amplify the voltage signal output by the temperature detection unit 100, so that the error of subsequent conversion caused by over-small model is avoided. The voltage follower circuit formed by the second operational amplifier unit U8A can realize isolation and buffering of the output voltage signal of the first operational amplifier unit U8C, and improves safety and stability.
In some embodiments of the present invention, a two-way voltage conditioning circuit 200 is employed. When the two-path voltage conditioning circuit 200 is adopted, four operational amplifiers are needed, and the functions of the two-path voltage conditioning circuit 200 can be realized by directly adopting a four-path operational amplifier chip. At the moment, the four-channel operational amplifier chip is adopted, so that the circuit structure can be effectively simplified, connecting wires are reduced, and the attractiveness and stability of the whole circuit can be improved. The four-channel OP-amp chip may employ OP484 ESZ.
In some embodiments of the present invention, referring to fig. 1, the selecting unit 300 further includes a plurality of output resistors R31, and the plurality of output resistors R31 are connected between the cathodes of the plurality of diodes D1 and the input terminal of the voltage-to-frequency conversion circuit 400 in a one-to-one correspondence. The output resistor R31 is set to ensure the safety of the output.
In some embodiments of the present invention, referring to fig. 1, the temperature acquisition circuit further includes a filter capacitor C32, wherein one end of the filter capacitor C32 is connected to the output terminal of the selection unit 300, and the other end is used for connecting to a ground line. The filter capacitor C32 can filter the voltage signal output by the diode D1, so as to ensure the stability of the voltage signal input to the voltage-to-frequency conversion circuit 400.
In some embodiments of the present invention, referring to fig. 2, the voltage-to-frequency conversion circuit 400 includes: the reference circuit comprises a first reference resistor R81, a second reference resistor R80, a third reference resistor R79, a fourth reference resistor R78, a fifth reference resistor R77, a reference capacitor C61 and a voltage-frequency conversion chip U14. A first reference resistor R81, one end of which is used for connecting a first working power supply; one end of the second reference resistor R80 is connected with the other end of the first reference resistor R81, and the other end of the second reference resistor R80 is used for being connected with a ground wire; a third reference resistor R79, one end of which is connected to the other end of the first reference resistor R81; a fourth reference resistor R78 connected between the other end of the third reference resistor R79 and ground; a fifth reference resistor R77, one end of which is connected to the other end of the third reference resistor R79; the reference capacitor C61 is connected with the fifth reference resistor R77 in parallel; the voltage-frequency conversion chip U14 has a voltage trigger terminal, a pulse voltage output terminal, a pulse current output terminal, and a monostable trigger pulse input terminal, the voltage trigger terminal of the voltage-frequency conversion chip U14 is connected to the output terminal of the selection unit 300, the pulse voltage output terminal is connected to the input terminal of the optical module driving circuit 500, and the pulse current output terminal and the monostable trigger pulse input terminal are both connected to the other end of the fifth reference resistor R77.
Referring to fig. 2, the first reference resistor R81, the second reference resistor R80, the third reference resistor R79, the fourth reference resistor R78, the fifth reference resistor R77, and the reference capacitor C61 are commonly used to enable the pulse current output terminal and the monostable trigger pulse input terminal of the voltage-to-frequency conversion chip U14 to operate normally, so as to ensure that the voltage-to-frequency conversion chip U14 can output a frequency signal from the pulse voltage output terminal according to a voltage signal input to the voltage trigger terminal by the selection unit 300. The voltage-frequency conversion chip U14 can adopt chips such as LM331 and LM 231.
In some embodiments of the present invention, referring to fig. 3, the light module driving circuit 500 includes: the driving circuit comprises a first driving resistor R27, a switching tube Q2 and a second driving resistor R28. A first driving resistor R27, one end of which is connected to the output end of the voltage-to-frequency conversion circuit 400; a switch tube Q2, the gate of which is connected to the other end of the first driving resistor R27, the source of which is connected to the ground, and the drain of which is connected to the light emitting module 600; the second driving resistor R28 is connected between the gate and the source of the switching transistor Q2. The voltage of the grid of the switching tube Q2 is changed, so that on-off control between the source and the drain of the switching tube Q2 can be realized, and after the switching tube Q2 is conducted, the anode and the cathode of the input end of the light emitting module 600 are conducted back to each other, so that light signals can be generated at the output end. In some embodiments of the present invention, the switching transistor Q2 may be a MOS transistor, a triode, or other switching device with a pass control capability.
According to a second aspect of the utility model, the temperature acquisition device comprises: a light emitting module 600 and a temperature acquisition circuit as described above. The light emitting module 600 has a positive input end for connecting to a second working power supply, and a negative input end connected to the output end of the light module driving circuit 500.
According to the temperature acquisition device provided by the embodiment of the utility model, the selection of the highest temperature can be realized through the temperature acquisition circuit, and the highest temperature data can be converted into the corresponding frequency signal, so that the light emission module 600 can be controlled to be switched on and off by using the frequency signal to emit the optical signal corresponding to the frequency of the frequency signal, and the purposes of long-distance temperature acquisition and transmission are achieved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the embodiments, and those skilled in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A temperature acquisition circuit, comprising:
the temperature detection device comprises a plurality of temperature detection units (100), wherein each temperature detection unit (100) is provided with two output ends, and each temperature detection unit (100) is used for converting the detected temperature into a voltage signal and outputting the voltage signal together through the two output ends of the temperature detection unit (100);
the temperature detection circuit comprises a plurality of voltage conditioning circuits (200), wherein each voltage conditioning circuit (200) is provided with an output end and two input ends, the voltage conditioning circuits (200) are arranged in a one-to-one correspondence manner with the temperature detection units (100), the two input ends of each voltage conditioning circuit (200) are respectively connected with the two output ends of the corresponding temperature detection unit (100) in a one-to-one correspondence manner, and each voltage conditioning circuit (200) is used for amplifying a voltage signal output by the temperature detection unit (100);
the voltage regulation circuit comprises a selection unit (300) and a control unit, wherein the selection unit (300) is provided with an output end and a plurality of input ends, the plurality of input ends of the selection unit (300) are respectively connected with the output ends of the plurality of voltage regulation circuits (200) in a one-to-one correspondence mode, and the selection unit (300) is used for outputting the largest voltage signal in the voltage signals input by the plurality of voltage regulation circuits (200);
the input end of the voltage-frequency conversion circuit (400) is connected with the output end of the selection unit (300) and is used for converting the voltage signal input by the selection unit (300) into a frequency signal;
and the input end of the optical module driving circuit (500) is connected with the output end of the voltage-frequency conversion circuit (400), the output end of the optical module driving circuit is connected with the light emitting module (600), and the optical module driving circuit (500) is used for adjusting the sending state of the light emitting module (600) according to the frequency signal.
2. The temperature acquisition circuit according to claim 1, wherein each of the temperature detection units (100) comprises:
one end of the thermistor is connected with a first working power supply, and the other end of the thermistor is connected with one input end of the voltage conditioning circuit (200);
a first resistor, one end of which is connected with the one end of the thermistor, and the other end of which is connected with the other input end of the voltage conditioning circuit (200);
one end of the second resistor is connected with the other end of the thermistor, and the other end of the second resistor is used for being connected with a ground wire;
and one end of the third resistor is connected with the other end of the first resistor, and the other end of the third resistor is connected with the ground wire.
3. The temperature acquisition circuit of claim 2, wherein the thermistor is an NTC resistor.
4. The temperature acquisition circuit according to claim 1, wherein the selection unit (300) comprises a plurality of diodes in a number consistent with the number of the voltage conditioning circuits (200), anodes of the plurality of diodes are respectively connected with the output ends of the plurality of voltage conditioning circuits (200) in a one-to-one correspondence, and cathodes of the plurality of diodes are all connected with the input end of the voltage-to-frequency conversion circuit (400).
5. The temperature acquisition circuit according to claim 4, wherein the voltage conditioning circuit (200) comprises:
a fourth resistor is connected between the positive input end of the first operational amplifier unit and one output end of the temperature detection unit (100), a fifth resistor is connected between the negative input end of the first operational amplifier unit and the other output end of the temperature detection unit (100), and a sixth resistor is connected between the output end and the negative input end of the first operational amplifier unit;
and a seventh resistor is connected between the positive input end of the second operational amplifier unit and the output end of the first operational amplifier unit, an eighth resistor is connected between the negative input end of the second operational amplifier unit and the cathode of the diode, and the output end of the second operational amplifier unit is connected with the anode of the diode.
6. The temperature acquisition circuit according to claim 4, wherein the selection unit (300) further comprises a plurality of output resistors, and the plurality of output resistors are connected between the plurality of diode cathodes and the input terminal of the voltage-to-frequency conversion circuit (400) in a one-to-one correspondence.
7. The temperature acquisition circuit according to claim 1, further comprising a filter capacitor, wherein one end of the filter capacitor is connected to the output terminal of the selection unit (300), and the other end of the filter capacitor is connected to a ground line.
8. The temperature acquisition circuit of claim 1, wherein the voltage to frequency conversion circuit (400) comprises:
one end of the first reference resistor is used for being connected with a first working power supply;
one end of the second reference resistor is connected with the other end of the first reference resistor, and the other end of the second reference resistor is used for being connected with a ground wire;
a third reference resistor having one end connected to the other end of the first reference resistor;
the fourth reference resistor is connected between the other end of the third reference resistor and the ground wire;
a fifth reference resistor, one end of which is connected to the other end of the third reference resistor;
the reference capacitor is connected with the fifth reference resistor in parallel;
and the voltage-frequency conversion chip is provided with a voltage trigger end, a pulse voltage output end, a pulse current output end and a monostable trigger pulse input end, wherein the voltage trigger end of the voltage-frequency conversion chip is connected with the output end of the selection unit (300), the pulse voltage output end is connected with the input end of the optical module driving circuit (500), and the pulse current output end and the monostable trigger pulse input end are both connected with the other end of the fifth reference resistor.
9. The temperature acquisition circuit according to claim 1, wherein the light module driving circuit (500) comprises:
one end of the first driving resistor is connected with the output end of the voltage-frequency conversion circuit (400);
the grid electrode of the switching tube is connected with the other end of the first driving resistor, the source electrode of the switching tube is connected with the ground wire, and the drain electrode of the switching tube is connected with the light emitting module (600);
and the second driving resistor is connected between the grid electrode and the source electrode of the switching tube.
10. A temperature collection device, comprising:
a temperature acquisition circuit as claimed in any one of claims 1 to 9;
and the positive input end of the light emitting module (600) is used for being connected with a second working power supply, and the negative input end of the light emitting module is connected with the output end of the light module driving circuit (500).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122382402.0U CN216081819U (en) | 2021-09-29 | 2021-09-29 | Temperature acquisition circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122382402.0U CN216081819U (en) | 2021-09-29 | 2021-09-29 | Temperature acquisition circuit and device |
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| CN216081819U true CN216081819U (en) | 2022-03-18 |
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| CN202122382402.0U Active CN216081819U (en) | 2021-09-29 | 2021-09-29 | Temperature acquisition circuit and device |
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