CN221123626U - Multichannel temperature sampling circuit and temperature sampling device - Google Patents
Multichannel temperature sampling circuit and temperature sampling device Download PDFInfo
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- CN221123626U CN221123626U CN202322609167.5U CN202322609167U CN221123626U CN 221123626 U CN221123626 U CN 221123626U CN 202322609167 U CN202322609167 U CN 202322609167U CN 221123626 U CN221123626 U CN 221123626U
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- 238000005070 sampling Methods 0.000 title claims abstract description 91
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 90
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 45
- 230000000875 corresponding effect Effects 0.000 claims description 51
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 238000001914 filtration Methods 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000002596 correlated effect Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model discloses a multichannel temperature sampling circuit and a temperature sampling device, which relate to the field of temperature sampling, realize the output of multichannel sampling signals by arranging a main control circuit, and receive the multichannel sampling signals by arranging a plurality of acquisition circuits, the acquisition circuits can enable multichannel analog switches contained in the acquisition circuits to be turned on based on the multichannel sampling signals after receiving the signals so as to acquire the voltages of platinum resistors corresponding to the turned-on multichannel analog switches, the purpose of not fixedly acquiring the temperature values of batteries with fixed channel numbers is realized by measuring a plurality of platinum resistor voltages through polling, and finally the acquired voltages are converted into temperature signals through the action of the main control module, so that the real-time monitoring of the temperatures of a plurality of batteries is accurately completed.
Description
Technical Field
The present utility model relates to the field of temperature sampling, and in particular, to a multi-channel temperature sampling circuit and a temperature sampling device.
Background
The high-speed development of the new energy field provides a broad prospect for the application and development of rechargeable batteries, and simultaneously, the battery is also provided with higher requirements. Since lithium is an active metal that is easily burned and exploded in battery production, there is a high risk especially in the case where the chemical reaction is very severe during the formation of the battery components. If the operation is incorrect, explosion and combustion of the lithium battery can be caused, so that the temperature of each battery is monitored in real time to avoid accidents such as equipment loss and personal injury.
In the prior art, the temperature sampling circuit can only collect the temperature value of a fixed channel number, if the channel number of temperature sampling is changed, the temperature sampling circuit can generate the phenomenon of sampling channel redundancy or sampling channel lack, when the sampling channel is redundant, resource waste can occur, and when the sampling channel is lack, a set of equipment is added, so that the hardware cost is greatly increased.
Disclosure of utility model
The utility model aims to provide a multichannel temperature sampling circuit and a temperature sampling device, which realize the purpose of not fixedly collecting the temperature values of batteries with fixed channel numbers by polling and measuring a plurality of platinum resistor voltages, and finally convert the collected voltages into temperature signals by the action of a main control module, thereby accurately completing the real-time monitoring of the temperatures of a plurality of batteries.
In order to solve the above technical problems, the present utility model provides a multi-channel temperature sampling circuit, including:
The main control circuit is respectively connected with the acquisition circuits and is used for transmitting temperature sampling signals to the acquisition circuits and receiving voltages transmitted by the acquisition circuits so as to generate corresponding temperature signals;
Each acquisition circuit comprises a plurality of multichannel analog switches, each acquisition circuit is correspondingly connected with a first end of a plurality of platinum resistors and a plurality of power modules respectively, and is used for powering on the corresponding power module, and after receiving the temperature sampling signal, closing each multichannel analog switch contained by the acquisition circuit based on control polling of the temperature sampling signal, and enabling the platinum resistor corresponding to the closed multichannel analog switch to be powered on;
and each platinum resistor, and the second end of each platinum resistor is connected with ground.
Optionally, the master control circuit includes:
The MCU is respectively connected with each acquisition circuit and the multipath analog-to-digital conversion chip, and is used for sending the temperature sampling signals to each acquisition circuit and generating corresponding temperature signals after receiving the voltages transmitted by the multipath analog-to-digital conversion chips;
The multipath analog-to-digital conversion chip is connected with each acquisition circuit respectively and is used for receiving the voltage transmitted by each acquisition circuit.
Optionally, the multi-channel analog switch includes:
first n:1 single ended channel analog switch, the first n: the control end of the single-ended channel analog switch is connected with the MCU, the input end of the single-ended channel analog switch is correspondingly connected with the first end of each platinum resistor, the output end of the single-ended channel analog switch is connected with the multipath analog-to-digital conversion chip, and the single-ended channel analog switch is used for starting the corresponding switch after receiving a temperature sampling signal transmitted by the MCU and transmitting the voltage transmitted by the platinum resistor corresponding to the switch after the switch is started to the multipath analog-to-digital conversion chip;
Second n:1 single ended channel analog switch, the second n: the control end of the 1 single-ended channel analog switch is connected with the MCU, the input end is connected with the power module, the output end is connected with the first end of each platinum resistor, the control end is used for powering on the power module, starting the corresponding switch after receiving the temperature sampling signal transmitted by the main control circuit, and enabling the platinum resistor corresponding to the started switch to be electrified, and the first n:1 single ended channel analog switch and said second n: and a switch in the 1 single-ended channel analog switch is controlled by the MCU to be opened in a correlated manner.
Optionally, the method further comprises:
And the power modules are respectively and correspondingly connected with the acquisition circuits and are used for supplying power to the corresponding platinum resistors through the corresponding acquisition circuits.
Optionally, the power module includes:
The positive input end of the first operational amplifier is connected with the first end of the first resistor, the negative input end of the first operational amplifier is respectively connected with the first end of the second resistor and the first end of the third resistor, and the output end of the first operational amplifier is connected with the first end of the third resistor;
the second end of the first resistor is connected with a reference power supply;
The second end of the second resistor is connected with the ground;
The third resistor;
The positive input end of the second operational amplifier is connected with the first end of the fourth resistor, the negative input end of the second operational amplifier is connected with the output end, and the output end of the second operational amplifier is connected with the first end of the fifth resistor;
The first end of the fourth resistor is connected with the corresponding acquisition circuit, and the second end of the fourth resistor is connected with the output end of the first operational amplifier;
And the second end of the fifth resistor is connected with the positive input end of the first operational amplifier.
Optionally, the method further comprises:
And the input end of the filtering module is connected with the reference power supply, and the second end of the filtering module is connected with the ground and is used for filtering direct current components in the electric energy output by the reference power supply.
Optionally, the filtering module is a capacitor, an input end of the capacitor is connected with the reference power supply, and a second end of the capacitor is connected with the ground and is used for filtering direct current components in electric energy output by the reference power supply.
Optionally, the method further comprises:
and the input end of each amplifying circuit is correspondingly connected with each acquisition circuit, and the output end of each amplifying circuit is connected with the main control circuit and is used for amplifying the voltage acquired by the corresponding acquisition circuit and transmitting the amplified voltage to the main control circuit.
Optionally, the amplifying circuit includes:
the positive input end of the third operational amplifier is connected with the first end of the sixth resistor, the negative input end of the third operational amplifier is respectively connected with the first end of the seventh resistor and the first end of the eighth resistor, and the output end of the third operational amplifier is respectively connected with the second end of the seventh resistor and the main control circuit;
The second end of the sixth resistor is connected with the corresponding acquisition circuit;
the seventh resistor;
and the second end of the eighth resistor is connected with ground.
In order to solve the technical problem, the utility model also provides a temperature sampling device which comprises a shell and the multichannel temperature sampling circuit, wherein the multichannel temperature sampling circuit is arranged in the shell.
The utility model aims to provide a multichannel temperature sampling circuit and a temperature sampling device, wherein the multichannel temperature sampling circuit and the temperature sampling device realize the output of multichannel sampling signals through a main control circuit, the multichannel sampling signals are received through a plurality of acquisition circuits, the acquisition circuits can enable multichannel analog switches contained in the acquisition circuits to be turned on based on the polling of the multichannel sampling signals after receiving the signals so as to acquire the voltage of platinum resistors corresponding to the turned-on multichannel analog switches, the purpose of not fixedly acquiring the temperature values of batteries with fixed channel numbers is realized through the polling measurement of a plurality of platinum resistor voltages, and finally the acquired voltage is converted into the temperature signals through the action of the main control module, so that the real-time monitoring of the temperatures of a plurality of batteries is accurately completed.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a multi-channel temperature sampling circuit according to the present utility model;
Fig. 2 is a schematic diagram of a multi-channel temperature sampling circuit according to another embodiment of the present utility model
Fig. 3 is a schematic diagram of connection relation of an acquisition circuit according to the present utility model.
Detailed Description
The utility model provides a multichannel temperature sampling circuit and a temperature sampling device, which realize the purpose of not fixedly collecting the temperature values of batteries with fixed channel numbers by polling and measuring a plurality of platinum resistor voltages, and finally convert the collected voltages into temperature signals by the action of a main control module, thereby accurately completing the real-time monitoring of the temperatures of a plurality of batteries.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a multi-channel temperature sampling circuit according to the present utility model, including:
The main control circuit 1 is respectively connected with the acquisition circuits 2, and is used for transmitting temperature sampling signals to the acquisition circuits 2 and receiving voltages transmitted by the acquisition circuits 2 to generate corresponding temperature signals;
Each acquisition circuit 2 comprising a plurality of multichannel analog switches is correspondingly connected with the first ends of a plurality of platinum resistors 3 and a plurality of power modules respectively, and is used for powering up the corresponding power modules, closing each multichannel analog switch contained by the acquisition circuit based on control polling of the temperature sampling signals after the temperature sampling signals are received, and enabling the platinum resistor 3 corresponding to the closed multichannel analog switch to be powered up;
each platinum resistor 3, and the second end of each platinum resistor 3 is connected to ground.
In the utility model, in order to flexibly monitor the temperatures of a plurality of batteries, a main control circuit 1 transmits temperature sampling signals to each acquisition circuit 2 comprising a plurality of multichannel analog switches, each acquisition circuit 2 polls and controls the closed state of the multichannel analog switch corresponding to the temperature sampling signals after the corresponding power module is electrified after the temperature sampling signals are acquired, so that the platinum resistor 3 corresponding to the multichannel analog switch is electrified, and because the voltage of the platinum resistor 3 corresponds to the temperature of the battery, after the platinum resistor 3 is electrified, the acquisition circuit 2 acquires the voltage of the platinum resistor 3 and sends the voltage to the main control circuit 1, so that the main control circuit 1 generates corresponding temperature signals based on the voltage of the platinum resistor 3, the purpose of not fixedly acquiring the temperature values of the batteries with the fixed channel number is realized by polling and measuring the voltage of the plurality of the platinum resistor 3, finally, the acquired voltage is converted into the temperature signals through the effect of the main control module, the real-time monitoring of the temperatures of the plurality of batteries is accurately completed, and the temperature acquisition channels can be increased according to the application scene in an extensible mode, and the high-precision temperature is realized. Compared with the conventional scheme, the structure is small in size and convenient to expand, hardware cost is saved, and the device has high reliability and economy.
The voltage of the platinum resistor 3 reflects the temperature of the corresponding battery.
It should be further noted that, in practical applications, the multi-channel analog switch included in each acquisition circuit 2 may be connected to the main control circuit 1 through a bus interface, for example, there are two acquisition circuits 2, and each acquisition circuit 2 includes an eight-channel analog switch, and if the number of voltages in the final poll is 16.
In practical application, the multichannel temperature sampling circuit of the application can be divided into a MCU (Microcontrol ler Unit, micro control unit), a multichannel analog-to-digital conversion chip, a constant current source output circuit, an analog switch and an operational amplification circuit, the specific structure is shown in fig. 2, wherein each platinum resistor 3 can be represented by a PT 100-1-n, the acquisition circuit 2 and the main control circuit 1 adopt a bus connection mode, a control line and a power line of the analog switch adopt a parallel mode, the sampling line adopts a step series mode to ensure the consistency of the acquisition circuit 2, and the connection relation of each acquisition circuit 2 is shown in fig. 3.
It should be further noted that the multi-channel temperature sampling circuit of the present application can expand the temperature sampling channels according to the channel number of the digital-to-analog conversion chip.
The embodiment provides a multichannel temperature sampling circuit, realize multichannel sampling signal's output through setting up master control circuit 1, and receive this part multichannel sampling signal through a plurality of acquisition circuit 2 that set up, acquisition circuit 2 can make self contained multichannel analog switch turn on based on multichannel sampling signal polling after receiving the signal, with the voltage of the platinum resistance 3 that the multichannel analog switch that gathers the opening corresponds, the purpose of the temperature value of the battery of fixed channel number of the fixed collection of realization of voltage through the polling, finally change the voltage of gathering into temperature signal through master control module's effect, the real-time supervision to a plurality of battery temperatures has been accurately accomplished.
Based on the above embodiments:
As an alternative embodiment, the master circuit 1 comprises:
The MCU is respectively connected with each acquisition circuit 2 and the multipath analog-to-digital conversion chip, and is used for sending temperature sampling signals to each acquisition circuit 2 and generating corresponding temperature signals after receiving the voltages transmitted by the multipath analog-to-digital conversion chips;
And the multipath analog-to-digital conversion chips are respectively connected with the acquisition circuits 2 and are used for receiving the voltage transmitted by the acquisition circuits 2.
In the utility model, the main control circuit 1 comprises an MCU and a plurality of analog-to-digital conversion chips, wherein the MCU is used for sending temperature sampling signals to each acquisition circuit 2 and generating corresponding temperature signals after receiving voltages transmitted by the plurality of analog-to-digital conversion chips, and the plurality of analog-to-digital conversion chips are used for receiving the voltages transmitted by each acquisition circuit 2, so that the sending of the temperature sampling signals, the receiving of the voltages and the generation of the temperature signals are accurately realized.
As an alternative embodiment, the multi-channel analog switch includes:
First n:1 single-ended channel analog switch, first n: the control end of the single-ended channel analog switch is connected with the MCU, the input end of the single-ended channel analog switch is correspondingly connected with the first end of each platinum resistor 3, the output end of the single-ended channel analog switch is connected with the multipath analog-to-digital conversion chip, and the single-ended channel analog switch is used for starting the corresponding switch after receiving a temperature sampling signal transmitted by the MCU, and transmitting the voltage transmitted by the platinum resistor 3 corresponding to the switch after the switch is started to the multipath analog-to-digital conversion chip;
second n:1 single-ended channel analog switch, second n: the control end of the 1 single-ended channel analog switch is connected with the MCU, the input end is connected with the power module, the output end is connected with the first end of each platinum resistor 3, the control end is used for starting a corresponding switch after the power module is electrified and receives a temperature sampling signal transmitted by the main control circuit 1, the platinum resistor 3 corresponding to the started switch is electrified, and the first n:1 single-ended channel analog switch and second n: the switch in the 1 single-ended channel analog switch is controlled by the MCU to be opened in a correlated way.
In the utility model, the multichannel analog switches all comprise a first n:1 single ended channel analog switch and second n:1 single ended channel analog switch, wherein the first n:1 single-ended channel analog switch and second n: the switch in the 1 single-ended channel analog switch is controlled by the MCU to be opened in a correlated mode, and the second n: the 1 single-ended channel analog switch is powered on a power module, and after receiving a temperature sampling signal transmitted by the main control circuit 1, the 1 single-ended channel analog switch can start a corresponding switch of the 1 single-ended channel analog switch, and enable a platinum resistor 3 corresponding to the started switch to be powered on, so that a first n: the 1 single-ended channel analog switch samples the part of voltage, and then the part of voltage is accurately transmitted to the multipath analog-digital conversion chip.
It should be noted that, after receiving the temperature sampling signal transmitted by the MCU, the multichannel analog switch can normally control itself by n:1 single-ended channel analog switch and second n:1 single ended channel analog switch on.
As an alternative embodiment, further comprising:
And the power supply modules are respectively and correspondingly connected with the acquisition circuits 2 and are used for supplying power to the corresponding platinum resistors 3 through the corresponding acquisition circuits 2.
The utility model also comprises a plurality of power supply modules, and the power supply modules are used for supplying power to the corresponding platinum resistors 3 through the corresponding acquisition circuits 2 so as to obtain the voltage of the platinum resistors 3 and the temperature of the battery later.
As an alternative embodiment, the power module includes:
The positive input end of the first operational amplifier is connected with the first end of the first resistor, the negative input end of the first operational amplifier is respectively connected with the first end of the second resistor and the first end of the third resistor, and the output end of the first operational amplifier is connected with the first end of the third resistor;
The second end of the first resistor is connected with a reference power supply;
The second end of the second resistor is connected with the ground;
a third resistor;
The positive input end of the second operational amplifier is connected with the first end of the fourth resistor, the negative input end of the second operational amplifier is connected with the output end, and the output end of the second operational amplifier is connected with the first end of the fifth resistor;
The first end of the fourth resistor is connected with the corresponding acquisition circuit 2, and the second end of the fourth resistor is connected with the output end of the first operational amplifier;
And the second end of the fifth resistor is connected with the positive input end of the first operational amplifier.
In the present utility model, a power supply module (constant current source) includes: the reference power supply (VREF) is rectified through the two operational amplifier circuits to obtain constant current, and accuracy of a scheme is improved.
As an alternative embodiment, further comprising:
And the input end of the filtering module is connected with the reference power supply, and the second end of the filtering module is connected with the ground and is used for filtering direct current components in the electric energy output by the reference power supply.
The utility model also comprises a filtering module which is used for filtering the direct current component in the output electric energy of the reference power supply, thereby improving the reliability of the scheme.
As an alternative embodiment, the filtering module is a capacitor, and an input end of the capacitor is connected with the reference power supply, and a second end of the capacitor is connected with the ground and is used for filtering direct current components in the output electric energy of the reference power supply.
In the utility model, the filter module is a capacitor, which is used for filtering direct current components in the output electric energy of the reference power supply, thereby improving the reliability of the scheme.
As an alternative embodiment, further comprising:
And the input end of each amplifying circuit is correspondingly connected with each acquisition circuit 2, and the output end of each amplifying circuit is connected with the main control circuit 1 and is used for amplifying the voltage acquired by the corresponding acquisition circuit 2 and transmitting the amplified voltage to the main control circuit 1.
The utility model further comprises an amplifying circuit which is used for amplifying the voltage acquired by the acquisition circuit 2, so that the voltage value of the analog quantity can be conveniently converted into the voltage value of the digital quantity, an accurate temperature signal can be obtained, and the temperature of the battery can be obtained.
As an alternative embodiment, the amplifying circuit includes:
The positive input end of the third operational amplifier is connected with the first end of the sixth resistor, the negative input end of the third operational amplifier is respectively connected with the first end of the seventh resistor and the first end of the eighth resistor, and the output end of the third operational amplifier is respectively connected with the second end of the seventh resistor and the main control circuit 1;
the second end of the sixth resistor is connected with the corresponding acquisition circuit 2;
A seventh resistor;
and the second end of the eighth resistor is connected with the ground.
In the present utility model, an amplifying circuit includes: the third operational amplifier, the sixth resistor, the seventh resistor and the eighth resistor form an operational amplifying circuit through the operational amplifier and surrounding resistors, so that the acquired voltage is amplified, and the cost is low.
The utility model also provides a corresponding embodiment of the temperature sampling device, which comprises a shell and the multichannel temperature sampling circuit, wherein the multichannel temperature sampling circuit is arranged in the shell.
The temperature sampling device provided in this embodiment corresponds to the above-mentioned multi-channel temperature sampling circuit, so that the temperature sampling device has the same beneficial effects as the above-mentioned multi-channel temperature sampling circuit, and therefore, please refer to the description of the embodiments of the multi-channel temperature sampling circuit, and the description is omitted herein.
It should be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A multi-channel temperature sampling circuit, comprising:
The main control circuit is respectively connected with the acquisition circuits and is used for transmitting temperature sampling signals to the acquisition circuits and receiving voltages transmitted by the acquisition circuits so as to generate corresponding temperature signals;
Each acquisition circuit comprises a plurality of multichannel analog switches, each acquisition circuit is correspondingly connected with a first end of a plurality of platinum resistors and a plurality of power modules respectively, and is used for powering on the corresponding power module, and after receiving the temperature sampling signal, closing each multichannel analog switch contained by the acquisition circuit based on control polling of the temperature sampling signal, and enabling the platinum resistor corresponding to the closed multichannel analog switch to be powered on;
and each platinum resistor, and the second end of each platinum resistor is connected with ground.
2. The multi-channel temperature sampling circuit of claim 1, wherein the master circuit comprises:
The MCU is respectively connected with each acquisition circuit and the multipath analog-to-digital conversion chip, and is used for sending the temperature sampling signals to each acquisition circuit and generating corresponding temperature signals after receiving the voltages transmitted by the multipath analog-to-digital conversion chips;
The multipath analog-to-digital conversion chip is connected with each acquisition circuit respectively and is used for receiving the voltage transmitted by each acquisition circuit.
3. The multi-channel temperature sampling circuit of claim 2, wherein the multi-channel analog switch comprises:
first n:1 single ended channel analog switch, the first n: the control end of the single-ended channel analog switch is connected with the MCU, the input end of the single-ended channel analog switch is correspondingly connected with the first end of each platinum resistor, the output end of the single-ended channel analog switch is connected with the multipath analog-to-digital conversion chip, and the single-ended channel analog switch is used for starting the corresponding switch after receiving a temperature sampling signal transmitted by the MCU and transmitting the voltage transmitted by the platinum resistor corresponding to the switch after the switch is started to the multipath analog-to-digital conversion chip;
Second n:1 single ended channel analog switch, the second n: the control end of the 1 single-ended channel analog switch is connected with the MCU, the input end is connected with the power module, the output end is connected with the first end of each platinum resistor, the control end is used for powering on the power module, starting the corresponding switch after receiving the temperature sampling signal transmitted by the main control circuit, and enabling the platinum resistor corresponding to the started switch to be electrified, and the first n:1 single ended channel analog switch and said second n: and a switch in the 1 single-ended channel analog switch is controlled by the MCU to be opened in a correlated manner.
4. The multi-channel temperature sampling circuit of claim 1, further comprising:
And the power modules are respectively and correspondingly connected with the acquisition circuits and are used for supplying power to the corresponding platinum resistors through the corresponding acquisition circuits.
5. The multi-channel temperature sampling circuit of claim 4, wherein the power module comprises:
The positive input end of the first operational amplifier is connected with the first end of the first resistor, the negative input end of the first operational amplifier is respectively connected with the first end of the second resistor and the first end of the third resistor, and the output end of the first operational amplifier is connected with the first end of the third resistor;
the second end of the first resistor is connected with a reference power supply;
The second end of the second resistor is connected with the ground;
The third resistor;
The positive input end of the second operational amplifier is connected with the first end of the fourth resistor, the negative input end of the second operational amplifier is connected with the output end, and the output end of the second operational amplifier is connected with the first end of the fifth resistor;
The first end of the fourth resistor is connected with the corresponding acquisition circuit, and the second end of the fourth resistor is connected with the output end of the first operational amplifier;
And the second end of the fifth resistor is connected with the positive input end of the first operational amplifier.
6. The multi-channel temperature sampling circuit of claim 5, further comprising:
And the input end of the filtering module is connected with the reference power supply, and the second end of the filtering module is connected with the ground and is used for filtering direct current components in the electric energy output by the reference power supply.
7. The multi-channel temperature sampling circuit of claim 6, wherein the filter module is a capacitor, and an input end of the capacitor is connected to the reference power supply, and a second end of the capacitor is connected to ground, and is used for filtering direct current components in the output electric energy of the reference power supply.
8. The multi-channel temperature sampling circuit of any one of claims 1 to 7, further comprising:
and the input end of each amplifying circuit is correspondingly connected with each acquisition circuit, and the output end of each amplifying circuit is connected with the main control circuit and is used for amplifying the voltage acquired by the corresponding acquisition circuit and transmitting the amplified voltage to the main control circuit.
9. The multi-channel temperature sampling circuit of claim 8, wherein the amplifying circuit comprises:
the positive input end of the third operational amplifier is connected with the first end of the sixth resistor, the negative input end of the third operational amplifier is respectively connected with the first end of the seventh resistor and the first end of the eighth resistor, and the output end of the third operational amplifier is respectively connected with the second end of the seventh resistor and the main control circuit;
The second end of the sixth resistor is connected with the corresponding acquisition circuit;
the seventh resistor;
and the second end of the eighth resistor is connected with ground.
10. A temperature sampling device comprising a housing and a multi-channel temperature sampling circuit according to any one of claims 1 to 9, the multi-channel temperature sampling circuit being disposed within the housing.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221123626U true CN221123626U (en) | 2024-06-11 |
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