CN204481789U - A kind of digital display meter analogue quantity output circuit - Google Patents
A kind of digital display meter analogue quantity output circuit Download PDFInfo
- Publication number
- CN204481789U CN204481789U CN201520213724.4U CN201520213724U CN204481789U CN 204481789 U CN204481789 U CN 204481789U CN 201520213724 U CN201520213724 U CN 201520213724U CN 204481789 U CN204481789 U CN 204481789U
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- resistance
- ohm
- digital display
- output
- operational amplifier
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Abstract
The utility model discloses a kind of digital display meter analogue quantity output circuit, comprise: input connects digital display table simulation signal output part, the inverting input of operational amplifier connects described input by the 4th resistance one end, and described inverting input is connected to output after connecting the 3rd resistance, the first resistance in turn; 6th resistance one end ground connection, the other end is connected to output after connecting the second resistance, and the normal phase input end of operational amplifier is connected on the line of the second resistance and the 6th resistance; The output of operational amplifier is connected to the base stage of triode by the 5th resistance, the emitter of described triode is connected on the line of the first resistance and the 3rd resistance.The utility model make use of short, the empty disconnected principle of operational amplifier void, the electric current in external load is only determined by the output voltage signal of single-chip microcomputer, does not change with the change of external load, and the analog quantity achieving digital display meter is stable to be exported.
Description
Technical field
The utility model relates to circuit engineering field, particularly relates to a kind of good stability, digital display meter analogue quantity output circuit that precision is high.
Background technology
At present, most of digital display meter after collecting electric parameter in, while digital display meter display, also need electric parameter to become to send and export to long-range equipment or terminal.In existing digital display meter, common way is: directly various electric parameter is converted to small voltage signal, and after being changed by a large amount of passive components, output is sent in change.This change send output easily to occur deviation, and less stable, precision do not reach requirement, causes output not linear.In addition, because required components and parts are more, make to adopt to realize in this way becoming and send the digital display meter complex structure of output, failure rate high.
Utility model content
For solving the problem, the utility model provides a kind of digital display meter analogue quantity output circuit, comprise input and output, also comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, triode, operational amplifier, its annexation is: input connects digital display table simulation signal output part, the inverting input of operational amplifier connects described input by the 4th resistance one end, and described inverting input is connected to output after connecting the 3rd resistance, the first resistance in turn; 6th resistance one end ground connection, the other end is connected to output after connecting the second resistance, and the normal phase input end of operational amplifier is connected on the line of the second resistance and the 6th resistance; The output of operational amplifier is connected to the base stage of triode by the 5th resistance, the emitter of described triode is connected on the line of the first resistance and the 3rd resistance.
Further, the 3rd resistance is greater than the first resistance.
Further, the second resistance is identical with the 6th resistance.
Further, the 5th resistance is identical with the 3rd resistance.
Further, the 3rd resistance and the 5th resistance scope are 7K ohm ~ 13K ohm, and the first resistance is 1 ohm ~ 100 ohm, and the second resistance and the 6th resistance scope are 80K ohm-120K ohm, and the 4th resistance scope is 7K ohm ~ 15K ohm.
Further, the 3rd resistance and the 5th resistance are 10K ohm, and the first resistance is 51 ohm, and the second resistance and the 6th resistance scope are 100K ohm, and the 4th resistance is 11K ohm.
The beneficial effects of the utility model are:
The utility model make use of short, the empty disconnected principle of operational amplifier void, electric current in external load is only determined by the output voltage signal of single-chip microcomputer, do not change with the change of external load, to overcome in prior art electric parameter to become to send during transmission and easily occur the shortcoming that deviation, stability are weak, precision is low, the analog quantity achieving digital display meter is stable to be exported.
Accompanying drawing explanation
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
As shown in Figure 1, the utility model comprises input (VCA1 in figure), output (VCC+ in figure), the first resistance (R1 in figure), the second resistance (R2 in figure), the 3rd resistance (R3 in figure), the 4th resistance (R4 in figure), the 5th resistance (R5 in figure), the 6th resistance (R6 in figure), triode (T1 in figure), operational amplifier (U1 in figure).Its annexation is:
The inverting input of operational amplifier connects single-chip microcomputer outputting analog signal by the 4th resistance one end, and is separately connected to output in turn by the 3rd resistance, the first resistance.6th resistance one end ground connection, the other end is connected to the normal phase input end of operational amplifier, and is connected to output by the second resistance.The output of operational amplifier is connected to the base stage of triode by the 5th resistance, the emitter of described triode is connected to one end that the first resistance is connected with the 3rd resistance, and load can be connected between source electrode and ground.
3rd resistance is generally greater than (preferably much larger than) the first resistance.In the present embodiment, the 3rd resistance scope is 7K ohm ~ 13K ohm, preferably 8K ohm ~ 12 ohm, and the present embodiment is 10k ohm.First resistance scope is 1 ohm ~ 100 ohm, preferably 30 ohm ~ 60 ohm, and the present embodiment is 51 ohm.
Further, the second resistance is identical with the 6th resistance, and scope is 80K ohm-120K ohm.In the present embodiment, both resistances are 100k ohm.
Further, the 5th resistance is close or identical with the 3rd resistance, and Standard resistance range is 7K ohm ~ 13K ohm, is 10K ohm in the present embodiment.
Further, the 4th resistance is 7K ohm ~ 15K ohm, preferably 10 K ohm ~ 12 K ohms, and the present embodiment is 11K ohm.
Below in conjunction with Fig. 1, the operation principle of this circuit is described in detail:
The voltage signal of input
for the analog quantity output signals of single-chip microcomputer, output valve can be
arbitrary value in scope, is not more than 5V usually.Because of R2=R6, therefore
, the empty short characteristic of operational amplifier makes
.
R4 upper formation electric current I R4, again because of the resolution of operational amplifier, makes
, triode
emitter current potential:
,
Resistance
on the electric current that flows through:
,
Cause
ohm, can think and flow through triode
the electric current of emitter
.Because of triode
collector current
, so flow through the electric current of outer meeting resistance RO
.
Because of operator
,
,
,
value design in advance, no longer change in circuit running, so the electric current in external load
size only by the output voltage signal of single-chip microcomputer
determine, do not change with the change of external load, thus the stable output of the analog quantity achieving digital display meter.
The beneficial effects of the utility model are:
The utility model make use of short, the empty disconnected principle of operational amplifier void, electric current in external load is only determined by the output voltage signal of single-chip microcomputer, do not change with the change of external load, to overcome in prior art electric parameter to become to send during transmission and easily occur the shortcoming that deviation, stability are weak, precision is low, the analog quantity achieving digital display meter is stable to be exported.
Claims (6)
1. a digital display meter analogue quantity output circuit, comprises input and output, it is characterized in that, also comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, triode, operational amplifier, its annexation is:
Input connects digital display table simulation signal output part, and the inverting input of operational amplifier connects described input by the 4th resistance one end, and described inverting input is connected to output after connecting the 3rd resistance, the first resistance in turn; 6th resistance one end ground connection, the other end is connected to output after connecting the second resistance, and the normal phase input end of operational amplifier is connected on the line of the second resistance and the 6th resistance; The output of operational amplifier is connected to the base stage of triode by the 5th resistance, the emitter of described triode is connected on the line of the first resistance and the 3rd resistance.
2. digital display meter analogue quantity output circuit as claimed in claim 1, it is characterized in that, the 3rd resistance is greater than the first resistance.
3. digital display meter analogue quantity output circuit as claimed in claim 1, it is characterized in that, the second resistance is identical with the 6th resistance.
4. the digital display meter analogue quantity output circuit as described in claim 1 or 2 or 3, is characterized in that, the 5th resistance is identical with the 3rd resistance.
5. the digital display meter analogue quantity output circuit as described in claim 1 or 2 or 3, it is characterized in that, 3rd resistance and the 5th resistance scope are 7K ohm ~ 13K ohm, first resistance is 1 ohm ~ 100 ohm, second resistance and the 6th resistance scope are 80K ohm-120K ohm, and the 4th resistance scope is 7K ohm ~ 15K ohm.
6. digital display meter analogue quantity output circuit as claimed in claim 5, it is characterized in that, the 3rd resistance and the 5th resistance are 10K ohm, and the first resistance is 51 ohm, second resistance and the 6th resistance scope are 100K ohm, and the 4th resistance is 11K ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520213724.4U CN204481789U (en) | 2015-04-10 | 2015-04-10 | A kind of digital display meter analogue quantity output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520213724.4U CN204481789U (en) | 2015-04-10 | 2015-04-10 | A kind of digital display meter analogue quantity output circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204481789U true CN204481789U (en) | 2015-07-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520213724.4U Active CN204481789U (en) | 2015-04-10 | 2015-04-10 | A kind of digital display meter analogue quantity output circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767517A (en) * | 2015-04-10 | 2015-07-08 | 乐山一拉得电网自动化有限公司 | Data display instrument analog quantity output circuit |
-
2015
- 2015-04-10 CN CN201520213724.4U patent/CN204481789U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767517A (en) * | 2015-04-10 | 2015-07-08 | 乐山一拉得电网自动化有限公司 | Data display instrument analog quantity output circuit |
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| GR01 | Patent grant |