CN207123342U - Temperature collection circuit and its system - Google Patents
Temperature collection circuit and its system Download PDFInfo
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- CN207123342U CN207123342U CN201721142098.XU CN201721142098U CN207123342U CN 207123342 U CN207123342 U CN 207123342U CN 201721142098 U CN201721142098 U CN 201721142098U CN 207123342 U CN207123342 U CN 207123342U
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Abstract
The utility model provides a kind of temperature collection circuit and its system.The temperature collection circuit includes line handover module and analog-to-digital conversion module；Line handover module is connected including four terminals with temperature sensor to be measured, and line handover module also includes parametric excitation output end, the first sampled signal output end, the second sampled signal output end, the first excitation input and the second excitation input.Line handover module is configured as the different port for making four terminals be selectively connected to line handover module according to the wiring requirement of temperature sensor to be measured, to form temperature collection circuit corresponding with the line system of temperature sensor to be measured.The temperature data of the temperature sensor of not collinear system on the premise of it need not be redesigned to temperature collection circuit, can be collected using the temperature collection circuit in the utility model embodiment.
Description
Technical field
It the utility model is related to thermometry field, more particularly to a kind of temperature collection circuit and its system.
Background technology
PT100 temperature sensors are a kind of instrument that temperature variable is converted to transmittable normalization output signal, main
It is used for the measurement and control to temperature parameter in industrial process.According to the difference of the mode of connection, PT100 temperature sensors can divide
For two-wire system, three-wire system and four-wire system.The measurement accuracy of the PT100 temperature sensors of not collinear system is different, such as, three-wire system and
Four-wire system temperature sensor can reduce the measurement error that the lead resistance in wiring is brought to some extent.
For the temperature data of collecting temperature sensor, the design method of temperature collection circuit of the prior art can first root
The temperature sensor of then a certain line is selected according to the measurement accuracy needed for product and cost, then temperature of the redevelopment for the line
Spend Acquisition Circuit.Because the temperature collection circuit of single One Wire is merely able to gather a kind of temperature data of temperature sensor, then
When running into some sudden accidents, for example, the temperature sensor of application scenarios change or former line face stopping production risk, it is necessary to
When being changed to the temperature sensor of former line, temperature collection circuit of the prior art can not just gather the temperature after changing
The temperature data of sensor, therefore, it is necessary to redesigned to temperature collection circuit, cause the delivery time of product to extend.
Utility model content
The utility model embodiment provides a kind of temperature collection circuit and its system, can be need not be to temperature acquisition
On the premise of circuit is redesigned, the temperature data of the temperature sensor of not collinear system is collected.
In a first aspect, the utility model embodiment provides a kind of temperature collection circuit, the temperature collection circuit includes line
Handover module and analog-to-digital conversion module processed.
Wherein, the line handover module includes parametric excitation output end, the first sampled signal output end, the second sampling letter
Number output end, the first excitation input and the second excitation input, the parametric excitation output end and the analog-to-digital conversion module
Reference edge connection, the first sampled signal output end is connected with the first sampling end of the analog-to-digital conversion module, described the
Two sampled signal output ends are connected with the second sampling end of the analog-to-digital conversion module, the first excitation input and the mould
First excitation output end connection of number modular converter, the second excitation of the second excitation input and the analog-to-digital conversion module
Output end connects；
The line handover module also includes four terminals, and four terminals are connected with temperature sensor to be measured；
The line handover module is configured as making described four to connect according to the wiring requirement of the temperature sensor to be measured
Line end is selectively connected to the parametric excitation output end, the first sampled signal output end, the second sampled signal output end,
On one excitation input and the second excitation input, to form temperature acquisition corresponding with the line system of the temperature sensor to be measured
Circuit.
In some embodiments of first aspect, the line handover module includes：Wired network and it is distributed in described connect
Multiple switch device on gauze network；The multiple switching device is configured as will according to the wiring of the temperature sensor to be measured
Ask and be respectively turned on or disconnect, four terminals is selectively connected to the parametric excitation output end, the first sampling letter
On number output end, the second sampled signal output end, the first excitation input and the second excitation input, with formed with it is described to be measured
Temperature collection circuit corresponding to the line system of temperature sensor.
In some embodiments of first aspect, the wired network be provided with first node A, section point B, Section three
Point C and fourth node D.
Wherein, the first terminals, the parametric excitation output end are connected with the first node A, are connect described first
Circuit between line end and the first node A is provided with first switch device.
Second terminals, the first sampled signal output end, the first node A, the first excitation input are equal
It is connected with the section point B, second switch device is provided with the circuit between the first node A and the section point B
Part, encouraged in the section point B and described first and be provided with the 3rd switching device on the circuit between input.
3rd terminals, the second sampled signal output end are connected with the 3rd node C；
4th terminals, the second excitation input, the 3rd node C are connected with the fourth node D, in institute
The circuit stated between the 4th terminals and the fourth node D is provided with the 4th switching device, in the 3rd node C and described
Circuit between fourth node D is provided with the 5th switching device.
In some embodiments of first aspect, the second switch device is connected with the 4th switching device, described
First switch device, the 3rd switching device and the 5th switching device disconnect, and make the temperature collection circuit and two wires
Temperature sensor processed is corresponding.
In some embodiments of first aspect, the first switch device, the 3rd switching device and the described 4th
Switching device is connected, and the second switch device and the 5th switching device disconnect, and make the temperature collection circuit and three lines
Temperature sensor processed is corresponding.
In some embodiments of first aspect, the first switch device is connected with the 5th switching device, described
Second switch device, the 3rd switching device and the 4th switching device disconnect, and make the temperature collection circuit and four lines
Temperature sensor processed is corresponding.
In some embodiments of first aspect, the switching device includes multiple breakpoints for wire jumper resistance welding.
In some embodiments of first aspect, the temperature collection circuit also includes filtration module, the filtration module
First input end be connected with the first sampled signal output end, the second input of the filtration module is adopted with described second
Sample signal output part is connected, and the first output end of the filtration module is connected with first sampling end, the filtration module
Second output end is connected with second sampling end.
In some embodiments of first aspect, the filtration module include first resistor, second resistance, the first electric capacity,
Second electric capacity, the 3rd electric capacity, the 5th node E and the 6th node F；Wherein, the first end of the first resistor is adopted with described first
Sample signal output part connects；Second end of the first resistor, the first end of first electric capacity, the first of second electric capacity
End, first sampling end are connected with the 5th node E；The first end of the second resistance and second sampled signal
Output end connects；Second end of the second resistance, the first end of the 3rd electric capacity, the second end of second electric capacity and institute
The second sampling end is stated to be connected with the 6th node F；Second end of first electric capacity and the second end of the 3rd electric capacity
It is grounded.
In some embodiments of first aspect, the temperature collection circuit also includes referrer module；Wherein, the reference
The input of module is connected with the parametric excitation output end, the first output end of the referrer module and the analog-to-digital conversion mould
The first reference edge connection of block, the second output end of the referrer module connect with the second reference edge of the analog-to-digital conversion module
Connect；The referrer module is configured as providing reference voltage to the analog-to-digital conversion module.
In some embodiments of first aspect, the referrer module includes：3rd resistor, the 4th resistance, the 5th resistance,
4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th node G, the 8th node H, the 9th node I and protelum point J；Wherein, it is described
Parametric excitation output end, the first end of the 3rd resistor, the first end of the 4th resistance connect with the 7th node G
Connect；Second end of the 3rd resistor, the first end of the 5th resistance are connected with the 8th node H, described Section eight
Point H is grounded；Second end of the 4th resistance, the first end of the 4th electric capacity, the first end of the 5th electric capacity, the mould
First reference edge of number modular converter is connected with the 9th node I；Second end of the 5th resistance, the 5th electric capacity
The second end, the 6th electric capacity first end and the analog-to-digital conversion module the second reference edge with the protelum point J
Connection；Second end of the 4th electric capacity and the second end of the 6th electric capacity are grounded.
In some embodiments of first aspect, the analog-to-digital conversion module is Analog-digital Converter ADC chips, described
ADC chips include at least four input/output passages.
Second aspect, the utility model embodiment provide a kind of temperature acquisition system, and the temperature acquisition system is included as above
Described temperature collection circuit, the temperature acquisition system also includes temperature sensor to be measured and processor, described to treat that testing temperature passes
Sensor is connected with the line handover module, and the processor is connected with the analog-to-digital conversion module, the processor with it is described
Analog-to-digital conversion module connects.
Because the temperature collection circuit that the utility model embodiment provides has foregoing circuit structure, therefore, therefore, line system
It is defeated that handover module can make four terminals be selectively connected to parametric excitation according to the wiring requirement of temperature sensor to be measured
Go out end, the first sampled signal output end, the second sampled signal output end, first excitation input and second excitation input on,
So as to form temperature collection circuit corresponding with the line system of temperature sensor to be measured.Therefore, embodiment of the present utility model provides
Temperature collection circuit can collect not collinear system on the premise of it need not be redesigned to temperature collection circuit
The temperature data of temperature sensor, so as to avoid the delivery time of product from extending.
Brief description of the drawings
This practicality may be better understood from the description to specific embodiment of the present utility model below in conjunction with the accompanying drawings
It is new wherein, same or analogous reference represents same or analogous feature.
Fig. 1 is the structural representation for the temperature collection circuit that the embodiment of the utility model one provides；
Fig. 2 is the structural representation for the temperature collection circuit that another embodiment of the utility model provides；
Fig. 3 is the structural representation of the temperature collection circuit for the corresponding two-wire system that the embodiment of the utility model one provides；
Fig. 4 is the structural representation of the temperature collection circuit equivalent with Fig. 3；
Fig. 5 is the structural representation of the temperature collection circuit for the corresponding three-wire system that the utility model embodiment provides；
Fig. 6 is the structural representation of the temperature collection circuit equivalent with Fig. 5；
Fig. 7 is the structural representation of the temperature collection circuit for the corresponding four-wire system that the utility model embodiment provides；
Fig. 8 is the structural representation of the temperature collection circuit equivalent with Fig. 7；
Fig. 9 is the structural representation for the temperature collection circuit that the another embodiment of the utility model provides.
Embodiment
The feature and exemplary embodiment of the various aspects of the utility model embodiment is described more fully below.Following
In detailed description, it is proposed that many details, to provide the comprehensive understanding to the utility model embodiment.But for
It will be apparent that the utility model embodiment can be in some in not needing these details for those skilled in the art
Implement in the case of details.Below to embodiment description be used for the purpose of by the example of the utility model embodiment is shown come
Offer is better understood to the utility model embodiment.The utility model embodiment is never limited to any tool set forth below
Body configures and algorithm, but element, part and algorithm are covered on the premise of the spirit of the utility model embodiment is not departed from
Any modification, replacement and improvement.In the the accompanying drawings and the following description, known structure and technology is not shown, to avoid
Unnecessary obscure is caused to the utility model embodiment.
The utility model embodiment provides a kind of temperature collection circuit and its system.The temperature collection circuit can be simultaneously
Meet the wiring requirement of the temperature sensor of not collinear system.By taking PT100 temperature sensors as an example, PT100 temperature sensors can divide
For two-wire system, three-wire system and four-wire system type.The measurement accuracy of the PT100 temperature sensors of not collinear system is different, three-wire system and
Four-wire system temperature sensor can reduce or even eliminate the measurement error that the lead resistance in wiring is brought.
Fig. 1 is the structural representation for the temperature collection circuit that the embodiment of the utility model one provides.As shown in figure 1, temperature
Acquisition Circuit includes：Line handover module 101 and analog-to-digital conversion module 103.
Wherein, line handover module 101 includes parametric excitation output end RO, the first sampled signal output end SO_1, second
Sampled signal output end SO_2, first excitation input DI_1 and second excitation input DI_2, parametric excitation output end RO with
The reference edge connection of analog-to-digital conversion module 103, the first sampled signal output end SO_1 and analog-to-digital conversion module 103 the first sampling
SI_1 connections are held, the second sampled signal output end SO_2 is connected with the second sampling end SI_2 of analog-to-digital conversion module 103, and first swashs
Encourage input DI_1 to be connected with the first excitation output end DO_1 of analog-to-digital conversion module 103, the second excitation input DI_2 and mould
Second excitation output end DO_2 connections of number modular converter 103.
Line handover module 101 also includes four terminals, and four terminals are connected with temperature sensor to be measured.
In one example, the temperature sensor of not collinear system can pass through four core terminals according to the respective mode of connection
Son is connected with four terminals of line handover module 101 respectively.For example two line system temp sensor passes through four core binding posts
In two cores be respectively connected to line handover module 101, three-wire system temperature sensor can pass through three cores in four core binding posts point
Other tie-in line handover module 101, four-wire system temperature sensor can be respectively connected to line system by four cores in four core binding posts
Handover module 101.Herein, four core binding posts can also replace with other binding posts more than four cores.
In another example, four wiring that the temperature sensor of not collinear system also can directly with line handover module 101
End connection.
Line handover module 101 is configured as making four terminals selectivity according to the wiring requirement of temperature sensor to be measured
Ground be connected to parametric excitation output end RO, the first sampled signal output end SO_1, the second sampled signal output end SO_2, first swash
The excitation input DI_2 of input DI_1 and second are encouraged, to form temperature acquisition electricity corresponding with the line system of temperature sensor to be measured
Road.
Because the temperature collection circuit that the utility model embodiment provides has foregoing circuit structure, therefore, the switching of line system
Module 101 can make four terminals be selectively connected to parametric excitation output according to the wiring requirement of temperature sensor to be measured
RO, the first sampled signal output end SO_1, the second sampled signal output end SO_2, the first excitation input DI_1 and second is held to swash
Encourage on input DI_2, so as to form temperature collection circuit corresponding with the line system of temperature sensor to be measured.With existing skill
Temperature collection circuit in art is compared, and the temperature collection circuit that the utility model embodiment provides need not can adopted to temperature
On the premise of collector is redesigned, the temperature data of the temperature sensor of not collinear system is collected, so as to avoid product
Delivery time extend, and reduce cost.
In embodiment of the present utility model, line handover module 101 can include wired network and be distributed in wire mesh
Multiple switch device on network.Multiple switch device can be configured as being respectively at according to the wiring requirement of temperature sensor to be measured
On-state or off-state, four terminals are made to be selectively connected to parametric excitation output end RO, the first sampled signal defeated
Go out to hold on SO_1, the second sampled signal output end SO_2, the first excitation input DI_1 and the second excitation input DI_2, with shape
Into temperature collection circuit corresponding with the line system of temperature sensor to be measured.
The wired network in the utility model embodiment and the multiple switch device being distributed on wired network are entered below
Row describes in detail.As shown in Fig. 2 the wired network of line handover module 101 is provided with first node A, section point B, the 3rd
Node C and fourth node D.
Wherein, the first terminals J1, parametric excitation output end RO are connected with first node A, in the first terminals J1 and
Circuit between first node A is provided with first switch device K1.
Second terminals J2, the first sampled signal output end SO_1, first node A, the first excitation input DI_1 with
Section point B connections, second switch device K2 are provided with the circuit between first node A and section point B, in section point
Circuit between the excitation inputs of B and first DI_1 is provided with the 3rd switching device K3.
3rd terminals J3, the second sampled signal output end SO_2 are connected with the 3rd node C.
4th terminals J4, the second excitation input DI_2, the 3rd node C are connected with fourth node D, in the 4th wiring
Circuit between the J4 and fourth node D of end is provided with the 4th switching device K4, the line between the 3rd node C and fourth node D
Road is provided with the 5th switching device K5.
For convenience of skilled artisan understands that the technical scheme of the utility model embodiment, with reference to Fig. 3 to Fig. 8 according to
Make multiple switch device in an ON state respectively according to the mode of connection of not collinear temperature sensor processed or the process of off-state
It is described in detail.Wherein, intermediate region represents switching device in an ON state for the rectangle frame of blank, and intermediate region is friendship
The rectangle frame of fork straight line represents that switching device is off.
Fig. 3 is the structural representation of the temperature collection circuit for the corresponding two-wire system that the utility model embodiment provides.In Fig. 3
The temperature sensor shown is RTD (Resistance Temperature Detectors, resistance temperature detector), RTD
One end be connected with the second terminals J2, the RTD other end is connected with the 3rd terminals J3.The second switch device shown in Fig. 3
Part K2 and the 4th switching device K4 in an ON state, first switch device K1, the 3rd switching device K3 and the 5th switching device
K5 is off, so that temperature collection circuit is corresponding with two line system temp sensor.
Fig. 4 is the structural representation of the temperature collection circuit equivalent with Fig. 3.In order to which two line system temp collection electricity is intuitively presented
The structure on road, the wired network that switching device is off part is filtered out in Fig. 4.With reference to Fig. 3 and Fig. 4 to two-wire system
The course of work of temperature collection circuit be described in detail.
When said temperature Acquisition Circuit works, the second excitation output end DO_2 output drivings of analog-to-digital conversion module 103
Signal, the drive signal is successively by the second excitation input DI_2, fourth node D, the 4th switching device K4 and the 3rd wiring
End J3 is inputted to RTD, to drive RTD to start working.Then, RTD inputs by the second terminals J2 to line handover module 101
First sampled signal, first sampled signal are being divided into two-way after section point B, are exported all the way by the first sampled signal
End SO_1 is inputted to the first sampling end SI_1 of analog-to-digital conversion module 103；Another way is successively by second switch device K2, first
Node A and parametric excitation output end RO is inputted to referrer module 102, referrer module 102 and is generated first according to the first reference signal
Reference signal and the second reference signal, the first reference signal are inputted to the first reference edge RI_1 of analog-to-digital conversion module 103, and second
Reference signal is inputted to the second reference edge RI_2 of analog-to-digital conversion module 103.Meanwhile RTD passes through the 3rd terminals J3 to line system
Handover module 101 inputs the second sampled signal, and the second sampled signal passes through the 3rd node C and the second sampled signal output end successively
SO_2 is inputted to the second sampling end SI_2 of analog-to-digital conversion module 103.Analog-to-digital conversion module 103 is according to above-mentioned first reference signal
It is the first sampled signal of input to the first sampling end SI_1 and input to the of the second sampling end SI_2 with the second reference signal
Two sampled signal assignment, data signal is converted from analog into by the first sampled signal and the second sampled signal.
Fig. 5 is the structural representation of the temperature collection circuit for the corresponding three-wire system that the utility model embodiment provides.RTD's
One end is connected with the first terminals J1 and the second terminals J2 respectively, and the RTD other end is connected with the 3rd terminals J3.In Fig. 5
First switch device K1, the 3rd switching device K3 and the 4th switching device K4 shown in an ON state, second switch device
K2 and the 5th switching device K5 are off, so that temperature collection circuit is corresponding with three-wire system temperature sensor.
Fig. 6 is the structural representation of the temperature collection circuit equivalent with Fig. 5.In order to which three-wire system temperature acquisition electricity is intuitively presented
The structure on road, the wired network that switching device is off part is filtered out in Fig. 6.With reference to Fig. 5 and Fig. 6 to three-wire system
The course of work of temperature collection circuit be described in detail.
When said temperature Acquisition Circuit works, the second excitation output end DO_2 outputs first of analog-to-digital conversion module 103
Drive signal, first drive signal is successively by the second excitation input DI_2, fourth node D, the 4th switching device, the 3rd
Node C and the 3rd terminals J3 are inputted to RTD first end；First excitation output end DO_1 outputs of analog-to-digital conversion module 103
Second drive signal, second drive signal is successively by the first excitation input DI_1, section point B and the second terminals J2
RTD the second end is inputted, RTD starts working under the first drive signal and the second drive signal.
Then, the signal at RTD the second end is divided into two-way, all the way by the first terminals J1 to line handover module 101
Input reference signal, the reference signal input by first switch device K1, first node A and parametric excitation output end RO successively
To referrer module 102, referrer module 102 generates the first reference signal and the second reference signal according to the first sampled signal, and first
Reference signal is inputted to the first reference edge RI_1 of analog-to-digital conversion module 103, the second reference signal and inputted to analog-to-digital conversion module
103 the second reference edge RI_2；Another way inputs the first sampled signal by the second terminals J2 to line handover module 101,
First sampled signal is inputted to analog-to-digital conversion module 103 by section point B and the first sampled signal output end SO_1 successively
The first sampling end SI_1；Meanwhile RTD first end is adopted by the 3rd terminals J3 to the input of line handover module 101 second
Sample signal, the second sampled signal are inputted to analog-to-digital conversion mould by the 3rd node C and the second sampled signal output end SO_2 successively
Second sampling end SI_2 of block 103.Analog-to-digital conversion module 103 is input according to above-mentioned first reference signal and the second reference signal
To the first sampling end SI_1 the first sampled signal and input to the second sampling end SI_2 the second sampled signal assignment, by the
One sampled signal and the second sampled signal are converted from analog into data signal.
Fig. 7 is the structural representation of the temperature collection circuit for the corresponding four-wire system that the utility model embodiment provides.RTD's
One end is connected with the first terminals J1 and the second terminals J2 respectively, the RTD other end respectively with the 3rd terminals J3 and the 4th
Terminals J4 connections.The first switch device K1 and the 5th switching device K5 shown in Fig. 7 in an ON state, second switch device
Part K2, the 3rd switching device K3 and the 4th switching device K4 are off, so that temperature collection circuit and four-wire system
Temperature sensor is corresponding.
Fig. 8 is the structural representation of the temperature collection circuit equivalent with Fig. 7.In order to which four-wire system temperature acquisition electricity is intuitively presented
The structure on road, the wired network that switching device is off part is filtered out in Fig. 8.With reference to Fig. 7 and Fig. 8 to four-wire system
The course of work of temperature collection circuit be described in detail.
When said temperature Acquisition Circuit works, the second excitation output end DO_2 output drivings of analog-to-digital conversion module 103
Signal, the drive signal successively by the second excitation input DI_2, fourth node D, the 4th switching device, the 3rd node C and
3rd terminals J3 inputs RTD first end, to drive RTD to start working.
Then, RTD first end inputs the second sampled signal by the 3rd terminals J3 to line handover module 101, the
Two sampled signals are inputted to the of analog-to-digital conversion module 103 by the 3rd node C and the second sampled signal output end SO_2 successively
Two sampling end SI_2.The signal at RTD the second end is divided into two-way, all the way by the first terminals J1 to line handover module 101
Input reference signal, the reference signal input by first switch device K1, first node A and parametric excitation output end RO successively
To referrer module 102, referrer module 102 generates the first reference signal and the second reference signal according to the first sampled signal, and first
Reference signal is inputted to the first reference edge RI_1 of analog-to-digital conversion module 103, the second reference signal and inputted to analog-to-digital conversion module
103 the second reference edge RI_2；Another way inputs the first sampled signal by the second terminals J2 to line handover module 101,
First sampled signal is inputted to analog-to-digital conversion module 103 by section point B and the first sampled signal output end SO_1 successively
The first sampling end SI_1.Analog-to-digital conversion module 103 is input to the according to above-mentioned first reference signal and the second reference signal
One sampling end SI_1 the first sampled signal and input are adopted to the second sampling end SI_2 the second sampled signal assignment by first
Sample signal and the second sampled signal are converted from analog into data signal.
The temperature collection circuit that Fig. 3 to Fig. 8 shows in the utility model embodiment correspond to respectively two-wire system, three-wire system and
Switching mode during four-wire system.It is to be appreciated that the mode of connection of two-wire system, three-wire system and four-wire system is not unique.Actually should
In, if the mode of connection of two-wire system, three-wire system and four-wire system adjusts, the technical side based on the utility model embodiment
Case, can be to the wired network in line handover module 101, the quantity of switching device and each switching device in wired network
Position adjusts accordingly, and the temperature collection circuit after being adjusted based on the utility model embodiment will belong to of the present utility model
Protection domain.
In embodiment of the present utility model, the implementation of switching device can be a variety of.
In one example, switching device can be mechanical switch, such as single-pole single-throw switch (SPST), or single-pole double-throw switch (SPDT), can
To make switch in an ON state by manual type or off-state.
In another example, switching device can be virtual switch, such as the on-off circuit being made up of transistor, can also
By electric signal controlling switch in an ON state or off-state.
In a preferred exemplary, switching device includes multiple breakpoints for wire jumper resistance welding, and now switching device is in
Off-state, when needing to connect, wire jumper resistance can be welded on corresponding breakpoint location, so that the derailing switch of correspondence position
Part is in an ON state.
Wherein, wire jumper resistance is also referred to as 0 ohm chip resistor, and 0 Ohmic resistance of installation can turn on signal wire；Do not install
0 Ohmic resistance represents that signal wire disconnects.Because the small volume of wire jumper resistance uses wire resistance to be easy to as switching device
It is welded on the temperature collection circuit of circuit board；On the other hand, the resistance of wire jumper resistance in itself is very low, can make as wire
With, therefore the cut-in temperature Acquisition Circuit stability accessed after wire jumper resistance is higher.
Fig. 9 is the structural representation for the temperature collection circuit that the another embodiment of the utility model provides.It is as shown in figure 9, warm
Degree Acquisition Circuit also includes filtration module 104, and the first input end of filtration module 104 and the first sampled signal output end SO_1 connect
Connect, the second input of filtration module 104 is connected with the second sampled signal output end SO_2, the first output of filtration module 104
End is connected with the first sampling end SI_1, and the second output end of filtration module 104 is connected with the second sampling end SI_2.The utility model
Filtration module 104 in embodiment is located at the voltage detecting circuit between line handover module 101 and analog-to-digital conversion module 103
On, the sampled signal that can be detected to temperature sensor both ends is filtered processing, so as to eliminate in sampled signal by other
The part of equipment interference, improve the accuracy of sampled signal.
The concrete structure of the component composition of filtration module 104 is also exemplarily illustrated in Fig. 9.As shown in figure 9, filtering mould
Block 104 includes first resistor R1, second resistance R2, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 5th node E and the
Six node F.
Wherein, first resistor R1 first end is connected with the first sampled signal output end SO_1；The second of first resistor R1
End, the first electric capacity C1 first end, the second electric capacity C2 first end, the first sampling end SI_1 are connected with the 5th node E；Second
Resistance R2 first end is connected with the second sampled signal output end SO_2；Second resistance R2 the second end, the of the 3rd electric capacity C3
One end, the second electric capacity C2 the second end and the second sampling end SI_2 are connected with the 6th node F；First electric capacity C1 the second end and
3rd electric capacity C3 the second end is grounded.It is understood that combining actual application scenarios, the utility model can be implemented
Filter circuit in example is adjusted accordingly or replaced.
As shown in figure 9, temperature collection circuit also includes referrer module 102, the input of referrer module 102 and parametric excitation
Output end RO connections, the first output end of referrer module 102 are connected with the first reference edge RI_1 of analog-to-digital conversion module 103, ginseng
Examine the second output end of module 102 to be connected with the second reference edge RI_2 of analog-to-digital conversion module 103, referrer module 102 is configured
To provide reference voltage to analog-to-digital conversion module 103.
The concrete structure of the component composition of referrer module 102 is also exemplarily illustrated in Fig. 9.As shown in figure 9, with reference to mould
Block 102 includes：3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6,
7th node G, the 8th node H, the 9th node I and protelum point J.
Wherein, parametric excitation output end RO, 3rd resistor R3 first end, the 4th resistance R4 first end with Section seven
Point G connections；3rd resistor R3 the second end, the 5th resistance R5 first end are connected with the 8th node H, the 8th node H ground connection；
4th resistance R4 the second end, the 4th electric capacity C4 first end, the 5th electric capacity C5 first end, the of analog-to-digital conversion module 103
One reference edge RI_1 is connected with the 9th node I；5th resistance R5 the second end, the 5th electric capacity C5 the second end, the 6th electric capacity
C6 first end and the second reference edge RI_2 of analog-to-digital conversion module 103 are connected with protelum point J；The second of 4th electric capacity C4
End and the 6th electric capacity C6 the second end are grounded.
Wherein, 3rd resistor be used for by parametric excitation output end RO input sampled signal be converted to the first reference signal and
Second reference signal.
4th resistance R4, the 5th resistance R5, the 4th electric capacity C4, the 5th electric capacity C5 and the 6th electric capacity C6 annexation and filter
The annexation of wave circuit is identical, for being filtered processing to the first reference signal and the second reference signal, so as to eliminate ginseng
The part disturbed in signal by other equipment is examined, and then improves the accuracy of the first reference signal and the second reference signal.
It is understood that with reference to practical application scene, the reference circuit in the utility model embodiment can be carried out
Corresponding adjustment is replaced, and the reference circuit after above-mentioned adjustment or replacement will fall into the scope of protection of the utility model.
In the utility model embodiment, analog-to-digital conversion module 103 can be Analog-digital Converter ADC chips, ADC chips
Including at least four input/output passages.
In one example, can be designed based on 4 passages, low-power consumption, the ADC chips of 16 in the utility model embodiment
Temperature collection circuit.Embodiment is：ADC chips design is first about for two-wire system, three-wire system, the temperature of four-wire system
Acquisition Circuit is spent, then for the pin of multiplexing, logic is carried out using wire jumper resistance and redirects connection, so as to realize for not collinear
The measurement of temperature sensor processed.
In the utility model embodiment, analog-to-digital conversion module 103 can also have for other to be converted analog signals into
The component of data signal function, it can specifically deploy to adopt for two-wire system, three-wire system, the temperature of four-wire system based on the component
The design of collector.
The utility model embodiment also provides a kind of temperature acquisition system.The temperature acquisition system includes temperature as described above
Spend Acquisition Circuit.The temperature acquisition system also includes temperature sensor to be measured and processor (not shown), temperature sensor to be measured
Four terminals of line handover module 101, processor and analog-to-digital conversion are selectively connected to according to respective wiring requirements
Module 103 connects.
According to embodiment of the present utility model, the temperature sensor of any line can access institute above by binding post
The temperature collection circuit stated, after temperature collection circuit completes temperature acquisition, collection result is sent to processing by universal serial bus
Device, collection result is handled by processor and controls the display process of temperature.Wherein, the carrier of temperature collection circuit can be with
For circuit board.
It should be noted that the temperature collection circuit and temperature acquisition system in the utility model embodiment can be applied to
In different industrial circles, the temperature sensor with not collinear system used in different industrial circles is measured, passes through tune
The wired network of whole temperature collection circuit, to adapt to the wiring requirement of the temperature sensor of not collinear system, so as to solve in the past
Temperature collection circuit applies the problem of single, substantially increases application flexibility, expands application.
In one example, the temperature collection circuit in the utility model embodiment and temperature acquisition system can be applied
In isolated island micro-capacitance sensor complex control system, for monitoring the temperature of industrial equipment internal and external environment.
It should be clear that each embodiment in this specification is described by the way of progressive, each embodiment it
Between same or analogous part mutually referring to, what each embodiment stressed be it is different from other embodiment it
Place.For device embodiment, related part may refer to the declaratives of embodiment of the method.The utility model embodiment is simultaneously
It is not limited to particular step and structure described above and shown in figure.Those skilled in the art can understand this reality
After the spirit of new embodiment, it is variously modified, changes and adds, or changes the order between step.Also, it is
For the sake of concise, the detailed description to known method technology is omitted here.
Functional block shown in structures described above block diagram can be implemented as hardware, software, firmware or their group
Close.When realizing in hardware, its may, for example, be electronic circuit, application specific integrated circuit (ASIC), appropriate firmware, insert
Part, function card etc..When being realized with software mode, the element of the utility model embodiment is used to perform required task
Program or code segment.Either code segment can be stored in machine readable media or the number by being carried in carrier wave program
It is believed that number being sent in transmission medium or communication links." machine readable media " can include storing or transmitting information
Any medium.The example of machine readable media includes electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM
(EROM), floppy disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can via such as because
The computer network of special net, Intranet etc. is downloaded.
The utility model embodiment can be realized in other specific forms, without departing from its spirit and essential characteristics.Example
Such as, the algorithm described in specific embodiment can be changed, and system architecture is without departing from the utility model embodiment
Essence spirit.Therefore, current embodiment is all counted as being exemplary rather than in all respects limited, and this practicality is new
The scope of type embodiment is defined by appended claims rather than foregoing description, also, falls into the implication and equivalent of claim
In the range of whole change so as to all be included among the scope of the utility model embodiment.
Claims (13)
- A kind of 1. temperature collection circuit, it is characterised in that including：Line handover module and analog-to-digital conversion module；Wherein, it is defeated to include parametric excitation output end, the first sampled signal output end, the second sampled signal for the line handover module Go out end, the first excitation input and the second excitation input, the parametric excitation output end and the ginseng of the analog-to-digital conversion module End connection is examined, the first sampled signal output end is connected with the first sampling end of the analog-to-digital conversion module, and described second adopts Sample signal output part is connected with the second sampling end of the analog-to-digital conversion module, and the first excitation input turns with the modulus The first excitation output end connection of block is changed the mold, the second excitation of the second excitation input and the analog-to-digital conversion module exports End connection；The line handover module also includes four terminals, and four terminals are connected with temperature sensor to be measured；The line handover module is configured as making four terminals according to the wiring requirement of the temperature sensor to be measured Be selectively connected to the parametric excitation output end, the first sampled signal output end, the second sampled signal output end, first swash Encourage on input and the second excitation input, to form temperature acquisition electricity corresponding with the line system of the temperature sensor to be measured Road.
- 2. temperature collection circuit according to claim 1, it is characterised in that the line handover module includes：Wire mesh Network and the multiple switch device being distributed on the wired network；The multiple switching device is configured as being respectively turned on or disconnecting according to the wiring requirement of the temperature sensor to be measured, makes Four terminals are selectively connected to the parametric excitation output end, the first sampled signal output end, the second sampling letter On number output end, the first excitation input and the second excitation input, to form the line system pair with the temperature sensor to be measured The temperature collection circuit answered.
- 3. temperature collection circuit according to claim 2, it is characterised in that the wired network be provided with first node A, Section point B, the 3rd node C and fourth node D；Wherein, the first terminals, the parametric excitation output end are connected with the first node A, in first terminals Circuit between the first node A is provided with first switch device；Second terminals, the first sampled signal output end, the first node A, the first excitation input are and institute Section point B connections are stated, second switch device is provided with the circuit between the first node A and the section point B, Circuit between the section point B and the first excitation input is provided with the 3rd switching device；3rd terminals, the second sampled signal output end are connected with the 3rd node C；4th terminals, the second excitation input, the 3rd node C are connected with the fourth node D, described the Circuit between four terminals and the fourth node D is provided with the 4th switching device, in the 3rd node C and the described 4th Circuit between node D is provided with the 5th switching device.
- 4. temperature collection circuit according to claim 3, it is characterised in that the second switch device and the described 4th is opened Close device to connect, the first switch device, the 3rd switching device and the 5th switching device disconnect, and make the temperature Acquisition Circuit is corresponding with two line system temp sensor.
- 5. temperature collection circuit according to claim 3, it is characterised in that the first switch device, the described 3rd open Close device to connect with the 4th switching device, the second switch device and the 5th switching device disconnect, and make the temperature It is corresponding with three-wire system temperature sensor to spend Acquisition Circuit.
- 6. temperature collection circuit according to claim 3, it is characterised in that the first switch device and the described 5th is opened Close device to connect, the second switch device, the 3rd switching device and the 4th switching device disconnect, and make the temperature Acquisition Circuit is corresponding with four-wire system temperature sensor.
- 7. temperature collection circuit according to claim 2, it is characterised in that the switching device includes supplying wire jumper electric resistance welding The multiple breakpoints connect.
- 8. temperature collection circuit according to claim 1, it is characterised in that the temperature collection circuit also includes filtering mould Block, the first input end of the filtration module are connected with the first sampled signal output end, and the second of the filtration module is defeated Enter end to be connected with the second sampled signal output end, the first output end of the filtration module connects with first sampling end Connect, the second output end of the filtration module is connected with second sampling end.
- 9. temperature collection circuit according to claim 8, it is characterised in that the filtration module includes first resistor, the Two resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 5th node E and the 6th node F；Wherein, the first end of the first resistor is connected with the first sampled signal output end；Second end of the first resistor, the first end of first electric capacity, the first end of second electric capacity, described first are adopted Sample end is connected with the 5th node E；The first end of the second resistance is connected with the second sampled signal output end；Second end of the second resistance, the first end of the 3rd electric capacity, the second end and described second of second electric capacity Sampling end is connected with the 6th node F；Second end of first electric capacity and the second end of the 3rd electric capacity are grounded.
- 10. temperature collection circuit according to claim 1, it is characterised in that the temperature collection circuit also includes reference Module；Wherein, the input of the referrer module is connected with the parametric excitation output end, the first output of the referrer module End is connected with the first reference edge of the analog-to-digital conversion module, the second output end of the referrer module and the analog-to-digital conversion mould The second reference edge connection of block；The referrer module is configured as providing reference voltage to the analog-to-digital conversion module.
- 11. temperature collection circuit according to claim 10, it is characterised in that the referrer module includes：3rd resistor, 4th resistance, the 5th resistance, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th node G, the 8th node H, the 9th node I and Protelum point J；Wherein, the parametric excitation output end, the first end of the 3rd resistor, the first end of the 4th resistance with it is described 7th node G connections；Second end of the 3rd resistor, the first end of the 5th resistance are connected with the 8th node H, described Section eight Point H is grounded；Second end of the 4th resistance, the first end of the 4th electric capacity, the first end of the 5th electric capacity, the modulus turn First reference edge of mold changing block is connected with the 9th node I；The second end, the second end of the 5th electric capacity, the first end of the 6th electric capacity and the modulus of 5th resistance Second reference edge of modular converter is connected with the protelum point J；Second end of the 4th electric capacity and the second end of the 6th electric capacity are grounded.
- 12. temperature collection circuit according to claim 1, it is characterised in that the analog-to-digital conversion module is simulation numeral ADC chips are changed, the ADC chips include at least four input/output passages.
- 13. a kind of temperature acquisition system, it is characterised in that including the temperature acquisition electricity as described in claim 1-12 any one Road, the temperature acquisition system also include temperature sensor to be measured and processor, the temperature sensor to be measured and the line system Handover module is connected, and the processor is connected with the analog-to-digital conversion module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721142098.XU CN207123342U (en) | 2017-09-06 | 2017-09-06 | Temperature collection circuit and its system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721142098.XU CN207123342U (en) | 2017-09-06 | 2017-09-06 | Temperature collection circuit and its system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108254089A (en) * | 2018-03-22 | 2018-07-06 | 深圳市英威腾电动汽车驱动技术有限公司 | A kind of temperature sampling circuit and controller |
| CN117782369A (en) * | 2023-12-27 | 2024-03-29 | 上海钧嵌传感技术有限公司 | RTD wire system number measuring circuit and method |
-
2017
- 2017-09-06 CN CN201721142098.XU patent/CN207123342U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108254089A (en) * | 2018-03-22 | 2018-07-06 | 深圳市英威腾电动汽车驱动技术有限公司 | A kind of temperature sampling circuit and controller |
| CN117782369A (en) * | 2023-12-27 | 2024-03-29 | 上海钧嵌传感技术有限公司 | RTD wire system number measuring circuit and method |
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