CN207939500U - A kind of double integration circuit and AD converter - Google Patents
A kind of double integration circuit and AD converter Download PDFInfo
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- CN207939500U CN207939500U CN201820254859.9U CN201820254859U CN207939500U CN 207939500 U CN207939500 U CN 207939500U CN 201820254859 U CN201820254859 U CN 201820254859U CN 207939500 U CN207939500 U CN 207939500U
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- amplifier
- analog switch
- microcontroller
- output end
- comparator
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Abstract
The utility model is related to AD conversion field, a kind of double integration circuit and AD converter include microcontroller, comparator and analog switch；The signal input part of the microcontroller is connected with the signal output end of the comparator, and the signal output end of the microcontroller is connected with the signal input part of the analog switch, and the analog switch is electrically connected with the comparator.The advantages such as a kind of double integration circuit of the utility model offer and AD converter, have circuit stability simple, and AD conversion precision is high, and production cost is low.
Description
Technical field
The utility model is related to AD conversion field, especially a kind of double integration circuit and AD converter.
Background technology
Integrated AD operation principle is that input voltage is converted into arteries and veins to fill width signal or frequency signal i.e. pulse frequency, so
Numerical value is obtained by timer/counter afterwards.Its advantage is that obtaining high-resolution with ball bearing made.But existing AD conversion circuits
Design it is complex, production cost is higher, AD convert precision it is not high.
Utility model content
For the defects in the prior art, a kind of double integration circuit of the utility model offer and AD converter, have circuit
Stablize simply, the advantages such as AD conversion precision is high, and production cost is low.
To achieve the goals above, a kind of double integration circuit provided by the utility model, including microcontroller, comparator and mould
Quasi- switch；The signal input part of the microcontroller is connected with the signal output end of the comparator, and the signal of the microcontroller is defeated
Outlet is connected with the signal input part of the analog switch, and the analog switch is electrically connected with the comparator.
Further, the comparator includes amplifier U2A and amplifier U2B；The output end of the amplifier U2A and microcontroller
Input terminal is connected, and the in-phase end of the amplifier U2A is connected with 2.5V power supplys, and the reversed section of the amplifier U2A is defeated with amplifier U2B's
Outlet is connected with the points of common connection of integrating capacitor C9, and in-phase end and the analog switch of the amplifier U2B are electrically connected, the fortune
The reverse side for putting U2B is connected with the points of common connection of integrating capacitor C9 and resistance R23.
Further, the analog switch include 4051 type analog switches, the 3rd pin of the 4051 type analog switch with
The in-phase end of amplifier U2B is connected, the 9th pin, the 10th pin and the 11st pin of the 4051 type analog switch respectively with it is described
The signal output end of microcontroller is connected.
A kind of AD converter, including shell and the integrated circuit board that is set in the shell, the integrated circuit board
On be integrated with double integration circuit, the double integration circuit includes microcontroller, comparator and analog switch；The signal of the microcontroller
Input terminal is connected with the signal output end of the comparator, the signal of the signal output end of the microcontroller and the analog switch
Input terminal is connected, and the analog switch is electrically connected with the comparator.
Further, the comparator includes amplifier U2A, amplifier U2B, integrating capacitor C9 and resistance R23；The amplifier
The output end of U2A is connected with the input terminal of microcontroller, and the in-phase end of the amplifier U2A is connected with 2.5V power supplys, the amplifier U2A
Reversed section be connected with the points of common connection of the output end of amplifier U2B and integrating capacitor C9, the in-phase end and mould of the amplifier U2B
Quasi- switch is electrically connected, and the reverse side of the amplifier U2B is connected with the points of common connection of integrating capacitor C9 and resistance R23.
Further, the analog switch include 4051 type analog switches, the 3rd pin of the 4051 type analog switch with
The in-phase end of amplifier U2B is connected, the 9th pin, the 10th pin and the 11st pin of the 4051 type analog switch respectively with it is described
The signal output end of microcontroller is connected.
The utility model has the beneficial effects that：A kind of double integration circuit of the utility model offer and AD converter, have electricity
Road is stablized simply, the advantages such as AD conversion precision is high, and production cost is low.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model double integration circuit embodiment；
Fig. 2 is the cut-away view of the utility model AD converter embodiment.
Specific implementation mode
Specific embodiment of the utility model is described more fully below, it should be noted that the embodiments described herein is served only for
For example, being not intended to limit the utility model.In the following description, in order to provide the thorough understanding to the utility model,
Elaborate a large amount of specific details.It will be apparent, however, to one skilled in the art that：These certain details need not be used
It saves to carry out the utility model.In other instances, in order to avoid obscuring the utility model, well known circuit is not specifically described,
Software or method.
Throughout the specification, meaning is referred to " one embodiment ", " embodiment ", " example " or " example "
It：A particular feature, structure, or characteristic described in conjunction with this embodiment or example is comprised at least one implementation of the utility model
In example.Therefore, the whole instruction it is each place occur the phrase " in one embodiment ", " in embodiment ", " one
Example " or " example " are not necessarily all referring to the same embodiment or example.Furthermore, it is possible to any combination appropriate and or sub-portfolio
By specific feature, structure or characteristic combination in one or more embodiments or example.In addition, those of ordinary skill in the art
It should be appreciated that diagram is provided to the purpose of explanation provided herein, and diagram is not necessarily drawn to scale.
The embodiment of double integration circuit：
As shown in Figure 1, double integration circuit includes microcontroller, comparator and analog switch；The signal of the microcontroller inputs
End is connected with the signal output end of the comparator, and the signal output end of the microcontroller and the signal of the analog switch input
End is connected, and the analog switch is electrically connected with the comparator.
Specifically, above-mentioned integrating circuit has circuit stability simple, AD conversion precision is high, and production cost is low to be waited a little, institute
Stating the signal of microcontroller can be selected according to actual needs, disclosure satisfy that the function of this programme i.e. as long as not limiting herein
It can.
In the present embodiment, the comparator includes amplifier U2A and amplifier U2B；The output end and microcontroller of the amplifier U2A
Input terminal be connected, the in-phase end of the amplifier U2A is connected with 2.5V power supplys, the reversed section of the amplifier U2A and amplifier U2B's
Output end is connected with the points of common connection of integrating capacitor C9, and in-phase end and the analog switch of the amplifier U2B are electrically connected, described
The reverse side of amplifier U2B is connected with the points of common connection of integrating capacitor C9 and resistance R23.The analog switch includes 4051 patterns
Quasi- switch, the 3rd pin of the 4051 type analog switch are connected with the in-phase end of amplifier U2B, the 4051 type analog switch
9th pin, the 10th pin and the 11st pin are connected with the signal output end of the microcontroller respectively.
Specifically, ought judge level height of the microcontroller according to CMP after the power is turned on, start double integration circuit；Pass through
AA, BB, CC switch the signal of 4051 type analog switch input integral circuits；With reference voltage _ full value, integrating capacitor C9 is filled
Electricity, while monolithic counter starts counting up, when being charged to 2.5V, comparator is reversed, and CMP becomes low level from high level,
Microcontroller carries out interrupt processing, stops counting, microcontroller obtains AD values at this time；Then use reference voltage _ zero (temperature compensating signal,
MV signals, mA signals, resistance signal, 10V signals) to integrating capacitor C9 timing dischargings.
The embodiment of AD converter：
As shown in Fig. 2, AD converter includes shell 1, there is the shell 1 receiving space 2, the receiving space 2 to set
It is equipped with circuit board 3, double integration circuit is integrated on 3 plate of the integrated circuit, the double integration circuit includes microcontroller, comparator
And analog switch；The signal input part of the microcontroller is connected with the signal output end of the comparator, the letter of the microcontroller
Number output end is connected with the signal input part of the analog switch, and the analog switch is electrically connected with the comparator.
In the present embodiment, the comparator includes the output end and microcontroller of amplifier U2A described in amplifier U2A and amplifier U2B
Input terminal be connected, the in-phase end of the amplifier U2A is connected with 2.5V power supplys, the reversed section of the amplifier U2A and amplifier U2B's
Output end is connected with the points of common connection of integrating capacitor C9, and in-phase end and the analog switch of the amplifier U2B are electrically connected, described
The reverse side of amplifier U2B is connected with the points of common connection of integrating capacitor C9 and resistance R23.
In the present embodiment, the analog switch includes 4051 type analog switches, the 3rd pin of the 4051 type analog switch
Be connected with the in-phase end of amplifier U2B, the 9th pin, the 10th pin and the 11st pin of the 4051 type analog switch respectively with institute
The signal output end for stating microcontroller is connected.It needs to illustrate, in the present embodiment, each original paper in the integrating circuit
It is essentially identical recorded in working method and advantageous effect and the embodiment of double integration circuit, it is not repeated herein.
Finally it should be noted that：The above various embodiments is only to illustrate the technical solution of the utility model, rather than limits it
System；Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should
Understand：It still can be with technical scheme described in the above embodiments is modified, either to which part or whole
Technical characteristic carries out equivalent replacement；And these modifications or replacements, this practicality that it does not separate the essence of the corresponding technical solution are new
The range of each embodiment technical solution of type, should all cover in the claim of the utility model and the range of specification.
Claims (6)
1. a kind of double integration circuit, it is characterised in that：Including microcontroller, comparator and analog switch；The signal of the microcontroller
Input terminal is connected with the signal output end of the comparator, the signal of the signal output end of the microcontroller and the analog switch
Input terminal is connected, and the analog switch is electrically connected with the comparator.
2. double integration circuit according to claim 1, it is characterised in that：The comparator includes amplifier U2A and amplifier
U2B；The output end of the amplifier U2A is connected with the input terminal of microcontroller, in-phase end and the 2.5V power supply phases of the amplifier U2A
Even, the reversed section of the amplifier U2A is connected with the points of common connection of the output end of amplifier U2B and integrating capacitor C9, the amplifier
The in-phase end of U2B is electrically connected with analog switch, and the reverse side of the amplifier U2B is public with integrating capacitor C9's and resistance R23
Tie point is connected.
3. double integration circuit according to claim 2, it is characterised in that：The analog switch, which includes that 4051 patterns are quasi-, to be opened
It closes, the 3rd pin of the 4051 type analog switch is connected with the in-phase end of amplifier U2B, and the 9th of the 4051 type analog switch draws
Foot, the 10th pin and the 11st pin are connected with the signal output end of the microcontroller respectively.
4. a kind of AD converter, it is characterised in that：Including shell and the integrated circuit board being set in the shell, the collection
At double integration circuit is integrated on circuit board, the double integration circuit includes microcontroller, comparator and analog switch；The monolithic
The signal input part of machine is connected with the signal output end of the comparator, and the signal output end of the microcontroller is opened with the simulation
The signal input part of pass is connected, and the analog switch is electrically connected with the comparator.
5. AD converter according to claim 4, it is characterised in that：The comparator includes amplifier U2A, amplifier U2B, product
Divide capacitance C9 and resistance R23；The output end of the amplifier U2A is connected with the input terminal of microcontroller, the in-phase end of the amplifier U2A
It is connected with 2.5V power supplys, the points of common connection phase of the reversed section of the amplifier U2A and the output end of amplifier U2B and integrating capacitor C9
Even, the in-phase end of the amplifier U2B is electrically connected with analog switch, reverse side and integrating capacitor C9 and the electricity of the amplifier U2B
The points of common connection for hindering R23 is connected.
6. AD converter according to claim 5, it is characterised in that：The analog switch includes 4051 type analog switches,
3rd pin of the 4051 type analog switch is connected with the in-phase end of amplifier U2B, the 9th pin of the 4051 type analog switch,
10th pin and the 11st pin are connected with the signal output end of the microcontroller respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820254859.9U CN207939500U (en) | 2018-02-12 | 2018-02-12 | A kind of double integration circuit and AD converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820254859.9U CN207939500U (en) | 2018-02-12 | 2018-02-12 | A kind of double integration circuit and AD converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207939500U true CN207939500U (en) | 2018-10-02 |
Family
ID=63652619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820254859.9U Active CN207939500U (en) | 2018-02-12 | 2018-02-12 | A kind of double integration circuit and AD converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207939500U (en) |
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2018
- 2018-02-12 CN CN201820254859.9U patent/CN207939500U/en active Active
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