CN207410327U - A kind of analog-to-digital conversion module of DC current and voltage tester - Google Patents
A kind of analog-to-digital conversion module of DC current and voltage tester Download PDFInfo
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- CN207410327U CN207410327U CN201721647379.0U CN201721647379U CN207410327U CN 207410327 U CN207410327 U CN 207410327U CN 201721647379 U CN201721647379 U CN 201721647379U CN 207410327 U CN207410327 U CN 207410327U
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Abstract
The utility model discloses a kind of DC currents and the analog-to-digital conversion module of voltage tester, including MCU control circuit, GSS Gear Select Switch circuit, voltage gain amplifying circuit and analog to digital conversion circuit, the MCU control circuit is connected with GSS Gear Select Switch circuit, voltage gain amplifying circuit and analog to digital conversion circuit communication；The MCU control circuit sends to GSS Gear Select Switch circuit, voltage gain amplifying circuit and analog to digital conversion circuit and instructs, and receives the data message that analog to digital conversion circuit is beamed back；The GSS Gear Select Switch circuit includes multiple different stalls that can be selected, and the voltage gain amplifying circuit includes multiple selectable gain amplification factors；Analog-digital conversion circuit as described is used to convert analog signals into digital signal and is sent to MCU control circuit.The utility model is used for the analog-to-digital conversion of voltage or current sample in circuit.
Description
Technical field
The utility model is related to Electric signal processing technical fields, and in particular to the modulus of a kind of DC current and voltage tester
Modular converter.
Background technology
It is past at this time in circuit design, it is necessary to which periodically either not timing samples some smaller voltage or current variable
Switch to toward the AD sample ports monitoring carried using circuit MCU itself or directly the external equipments such as external voltage table, ammeter
To read.The former circuit carries MCU and not necessarily has AD ports in itself, even if there is AD sample ports, A/D conversion accuracy is often
It is not high or can to MCU work normally affect.The latter is read using external equipment, one side peripheral equipment control trouble,
Another aspect external equipment cost is often higher, does not meet the purpose of circuit design low-cost high-efficiency.
Utility model content
The technical issues of the utility model solves is to provide a kind of high-precision and does not influence the electricity that circuit works normally in itself
Road and the analog-to-digital conversion module of voltage tester.
In order to solve the above technical problems, the technical scheme is that：
The analog-to-digital conversion module of a kind of DC current and voltage tester, including MCU control circuit, GSS Gear Select Switch electricity
Road, voltage gain amplifying circuit and analog to digital conversion circuit, the MCU control circuit increase with GSS Gear Select Switch circuit, voltage
Beneficial amplifying circuit and analog to digital conversion circuit communication connection；The MCU control circuit is put to GSS Gear Select Switch circuit, voltage gain
Big circuit and analog to digital conversion circuit send instruction, and receive the data message that analog to digital conversion circuit is beamed back；The gear selection
On-off circuit includes multiple different stalls that can be selected, and the voltage gain amplifying circuit is put including multiple selectable gains
Big multiple；Analog-digital conversion circuit as described is used to convert analog signals into digital signal and is sent to MCU control circuit.
Further, the GSS Gear Select Switch circuit is made of multiple relays.
Further, the voltage gain amplifying circuit includes voltage amplification chip, and the voltage amplification chip can
Voltage data editor is amplified.
Further, the amplification factor of the voltage amplification chip include 1 times, 2 times, 4 times, 8 times, 16 times, 32 times, 64
Times and 128 times of eight optional amplification factors.
Further, the analog to digital conversion circuit includes analog-digital converter.
Further, current sampling circuit is further included, the current sampling circuit is used to current signal being converted to voltage
Signal.
The advantageous effect that the utility model is realized mainly has the following：Pass through GSS Gear Select Switch circuit and voltage gain
Amplifying circuit coordinates with analog to digital conversion circuit, is the size of analog to digital conversion circuit best transition by voltage signal processing, so as to carry
The high precision of voltage signal analog-to-digital conversion；In addition, modular circuit it is simple in structure it is easily operated, small be easy to transplant, and both
Available for can be used in testing current in voltage tester.
Description of the drawings
Fig. 1 is the structural representation of the analog-to-digital conversion module of DC current and voltage tester in the utility model embodiment one
Figure；
Fig. 2 is the stream of the analog-to-digital conversion module analog-to-digital conversion of DC current and voltage tester in the utility model embodiment one
Journey schematic diagram；
The modular circuit schematic diagram that Fig. 3 is analog-digital converter AD7721 in the utility model embodiment one is intended to；
Fig. 4 is MCU control circuit and the sequence diagram of analog to digital conversion circuit work in the utility model embodiment one.
Attached drawing is only for illustration, it is impossible to be interpreted as the limitation to this patent；It is attached in order to more preferably illustrate the present embodiment
Scheme some components to have omission, zoom in or out, do not represent the size of actual product；To those skilled in the art,
Some known features and its explanation may be omitted and will be understood by attached drawing；The same or similar label corresponds to same or similar
Component；The terms describing the positional relationship in the drawings are only for illustration, it is impossible to be interpreted as the limitation to this patent.
Specific embodiment
In order to facilitate the understanding of those skilled in the art, below in conjunction with attached drawing and embodiment to the utility model into traveling
One step is described in detail.
Embodiment one
Referring to Fig. 1, the analog-to-digital conversion module of a kind of DC current and voltage tester, is selected including MCU control circuit, gear
Select on-off circuit, voltage gain amplifying circuit and analog to digital conversion circuit, the MCU control circuit and GSS Gear Select Switch electricity
Road, voltage gain amplifying circuit and analog to digital conversion circuit communication connection；The MCU control circuit to GSS Gear Select Switch circuit,
Voltage gain amplifying circuit and analog to digital conversion circuit send instruction, and receive the data message that analog to digital conversion circuit is beamed back.Institute
Stating GSS Gear Select Switch circuit includes multiple different stalls that can be selected, when the voltage or electric current that need to detect are very small
When, due to modulus conversion chip linear problem in analog to digital conversion circuit, error can be bigger, using driving switch selection circuit pair
The signal of sampling first carries out gear selection, selects suitable gear according to the value scope estimated, ensures measured value required precision；Shelves
Position selected on-off circuit is mainly made of several gear selective relays, is divided the signal of input module by different relays
Into different gears, stepping is realized.
The voltage gain amplifying circuit includes multiple selectable gain amplification factors, voltage gain amplifying circuit core
It is voltage amplification chip, the voltage amplification chip can amplify voltage data editor.Specific amplifying factors include 1 times, 2
Again, 4 times, 8 times, 16 times, 32 times, 64 times and 128 times of eight optional amplification factors.So as to bigger according to the voltage of input or electric current
The small suitable gear of selection, is amplified the small voltage or low current of input, and then ensures the precision of measurement.
It please refers to Fig.1 and Fig. 3, analog-digital conversion circuit as described is used to convert analog signals into digital signal and be sent to
Continuous waveform modelling signal is converted into identifiable square-wave signal first, then is converted by MCU by MCU control circuit
Hexadecimal numerical value facilitates the equipment of upper connection that can identify.The analog to digital conversion circuit includes analog-digital converter, institute
The analog-digital converter stated is preferably AD7721 analog-digital converters, the AD7721 analog-digital converters include modulus conversion chip and
Peripheral circuit, peripheral circuit mainly include chip power supply circuit, external crystal oscillation circuit, outside reference 2500mV circuits, voltage letter
Number input port filter circuit.
In addition, adding in current sampling circuit in above-mentioned analog-to-digital conversion module, it is used for by current sampling circuit by electricity
Stream signal is converted to voltage signal, so as to realize the conversion of current signal indirectly by the analog-to-digital conversion of voltage signal.
Please refer to Fig.1 ~ Fig. 4, during the analog-to-digital conversion module work of above-mentioned DC current and voltage tester, MCU control electricity
Road is connected with computer communication, is sent a command to MCU control circuit by computer, then is sent out computer by MCU control circuit
The order gone out is transmitted to GSS Gear Select Switch circuit, voltage gain amplifying circuit and analog to digital conversion circuit, simultaneous computer and also connects
Receive the data that MCU control circuit is beamed back.During work, first pass through voltage or testing current instrument and voltage letter is carried out in test circuit
Number or current signal sampling, if current signal then needs to be converted to voltage signal through current sampling circuit and then inputs gear
Switch selection circuit if voltage signal, then directly inputs driving switch selection circuit；Driving switch selection circuit is according to input
The magnitude range of voltage signal selects a suitable gear, such as 1 times, 2 times, 4 times, 8 times, 16 times, 32 times, 64 times and 128 times
A gear in eight gears；Then the gear selected by voltage gain amplifying circuit according to driving switch selection circuit is to electricity
Pressure signal is amplified, and by driving switch selection circuit and voltage gain amplifying circuit, treated that voltage signal has been mould
The voltage signal of the optimal size of number conversion circuit conversion, so as to the precision higher of analog-to-digital conversion；Analog to digital conversion circuit will simulate
Signal is converted to digital signal and is sent to MCU control circuit, and MCU control circuit real time monitoring analog to digital conversion circuit is specially
The PA5 mouths of MCU monitor RFS/DRDY mouthfuls always, and RFS/DRDY mouthfuls are ready for by representing data during low become higher, and can be read
It takes, monitors SCLK sequential at this time, when the next trailing edge of the sequential can start to read data, as voltage data, MCU controls
MCU in circuit start read data after, the data read are stored temporarily in internal storage region, etc. a cycles data read
It is complete and then by the data read carry out preliminary treatment, be then returned to computer, according to certain calculation formula can draw will
The voltage or current value of measurement.
Obviously, above-described embodiment of the utility model is only intended to clearly illustrate the utility model example, and
It is not the restriction to the embodiment of the utility model.For those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
It is exhaustive.All any modification, equivalent and improvement made within the spirit and principle of the utility model etc., should be included in
Within the protection domain of the utility model claims.
Claims (6)
1. a kind of analog-to-digital conversion module of DC current and voltage tester, it is characterised in that：It is selected including MCU control circuit, gear
Select on-off circuit, voltage gain amplifying circuit and analog to digital conversion circuit, the MCU control circuit and GSS Gear Select Switch electricity
Road, voltage gain amplifying circuit and analog to digital conversion circuit communication connection；The MCU control circuit to GSS Gear Select Switch circuit,
Voltage gain amplifying circuit and analog to digital conversion circuit send instruction, and receive the data message that analog to digital conversion circuit is beamed back；Institute
Stating GSS Gear Select Switch circuit includes multiple different stalls that can be selected, and the voltage gain amplifying circuit includes multiple optional
The gain amplification factor selected；Analog-digital conversion circuit as described is used to convert analog signals into digital signal and is sent to MCU controls
Circuit.
2. the analog-to-digital conversion module of DC current according to claim 1 and voltage tester, it is characterised in that：The shelves
Position selected on-off circuit is made of multiple relays.
3. the analog-to-digital conversion module of DC current according to claim 1 and voltage tester, it is characterised in that：The electricity
Gain amplifying circuit is pressed to include voltage amplification chip, the voltage amplification chip can amplify voltage data editor.
4. the analog-to-digital conversion module of DC current according to claim 3 and voltage tester, it is characterised in that：The electricity
Pressing the amplification factor of large chip includes 1 times, 2 times, 4 times, 8 times, 16 times, 32 times, 64 times and 128 times eight optional times magnifications
Number.
5. the analog-to-digital conversion module of DC current according to claim 1 and voltage tester, it is characterised in that：The mould
Number conversion circuit includes analog-digital converter.
6. according to claim 1 ~ 5 any one of them DC current and the analog-to-digital conversion module of voltage tester, it is characterised in that：
Current sampling circuit is further included, the current sampling circuit is used to current signal being converted to voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721647379.0U CN207410327U (en) | 2017-12-01 | 2017-12-01 | A kind of analog-to-digital conversion module of DC current and voltage tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721647379.0U CN207410327U (en) | 2017-12-01 | 2017-12-01 | A kind of analog-to-digital conversion module of DC current and voltage tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207410327U true CN207410327U (en) | 2018-05-25 |
Family
ID=62317273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721647379.0U Active CN207410327U (en) | 2017-12-01 | 2017-12-01 | A kind of analog-to-digital conversion module of DC current and voltage tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207410327U (en) |
-
2017
- 2017-12-01 CN CN201721647379.0U patent/CN207410327U/en active Active
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