CN204495909U - Wide-range high-accuracy electrical resistance collection circuit - Google Patents
Wide-range high-accuracy electrical resistance collection circuit Download PDFInfo
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- CN204495909U CN204495909U CN201520180505.0U CN201520180505U CN204495909U CN 204495909 U CN204495909 U CN 204495909U CN 201520180505 U CN201520180505 U CN 201520180505U CN 204495909 U CN204495909 U CN 204495909U
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- resistor
- oxide
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- semiconductor
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- 239000004065 semiconductor Substances 0.000 claims abstract description 26
- 238000012360 testing method Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000013139 quantization Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
Abstract
The utility model discloses a kind of wide-range high-accuracy electrical resistance collection circuit, include two metal-oxide-semiconductors Q2, Q3, the grid of metal-oxide-semiconductor Q3 is connected with C_1 terminal, pull-up resistor R5, and the drain electrode of metal-oxide-semiconductor Q3 is connected with pull-up resistor R3; The grid of metal-oxide-semiconductor Q2 is connected with C_2 terminal, pull-up resistor R6, and the drain electrode of metal-oxide-semiconductor Q2 is connected with pull-up resistor R4; The other end of pull-up resistor R5, R3, R6, R4 is connected successively and is connected with 12V direct supply by node; Metal-oxide-semiconductor Q2, Q3 source electrode is connected and is connected with resistance R8, variable resistor VR respectively by node, and the other end of resistance R8 is connected with R_MCU terminal; C_1, C_2 terminal is all connected with single-chip microcomputer.The utility model is by changing divider resistance in real time to testing resistance segment quantization, and the method successively measured solves the contradiction between measurement range and measuring accuracy, and wide region and high precision are coexisted.
Description
Technical field
The utility model relates generally to electronic circuit field, particularly relates to wide-range high-accuracy electrical resistance collection circuit.
Background technology
Resistance sampling circuit is mainly by series connection testing resistance, and detect the magnitude of voltage that testing resistance is got and deliver to monolithic, its resistance size is calculated by software, because the existence of Chip Microcomputer A/D sampling precision and external interference determines that it cannot carry out precise quantification sampling to too little magnitude of voltage, the sensor (as 0 ~ 30K) that some change in resistance scopes are larger is just needed pull-up voltage to be changed into 30000 parts and delivers to the calculating of AD mouth, obviously be difficult to calculate accurately, namely wide the and measuring accuracy of measurement range high between contradiction.
Utility model content
The utility model object is exactly the defect in order to make up prior art, provides a kind of wide-range high-accuracy electrical resistance collection circuit, for the resistance type sensor high precision collecting that resistance range is larger.
The utility model is achieved through the following technical solutions:
Wide-range high-accuracy electrical resistance collection circuit, is characterized in that: include two metal-oxide-semiconductors Q2, Q3, and the grid of metal-oxide-semiconductor Q3 is connected with C_1 terminal, be connected by node one end with pull-up resistor R5, and the drain electrode of metal-oxide-semiconductor Q3 is connected with one end of pull-up resistor R3; The grid of metal-oxide-semiconductor Q2 is connected with C_2 terminal, be connected by node one end with pull-up resistor R6, and the drain electrode of metal-oxide-semiconductor Q2 is connected with one end of pull-up resistor R4; The other end of pull-up resistor R5, R3, R6, R4 is connected successively and is connected with 12V direct supply by node; Metal-oxide-semiconductor Q2, Q3 source electrode is connected and is connected with one end of resistance R8, variable resistor VR respectively by node, and the other end of resistance R8 is connected with R_MCU terminal; C_1, C_2 terminal is all connected with single-chip microcomputer.
The utility model has the advantages that:
The utility model is by changing divider resistance in real time to testing resistance segment quantization, and the method successively measured solves the contradiction between measurement range and measuring accuracy, and wide region and high precision are coexisted.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
As shown in Figure 1, wide-range high-accuracy electrical resistance collection circuit, includes two metal-oxide-semiconductors Q2, Q3, and the grid of metal-oxide-semiconductor Q3 is connected with C_1 terminal, be connected by node one end with pull-up resistor R5, and the drain electrode of metal-oxide-semiconductor Q3 is connected with one end of pull-up resistor R3; The grid of metal-oxide-semiconductor Q2 is connected with C_2 terminal, be connected by node one end with pull-up resistor R6, and the drain electrode of metal-oxide-semiconductor Q2 is connected with one end of pull-up resistor R4; The other end of pull-up resistor R5, R3, R6, R4 is connected successively and is connected with 12V direct supply by node; Metal-oxide-semiconductor Q2, Q3 source electrode is connected and is connected with one end of resistance R8, variable resistor VR respectively by node, and the other end of resistance R8 is connected with R_MCU terminal; C_1, C_2 terminal is all connected with single-chip microcomputer.
Embodiment:
Single-chip microcomputer selects to open by C_1, C_2 terminal and cuts out metal-oxide-semiconductor Q2, Q3, allows pull-up resistor R3, R4 gradation access circuit under test, realizes the segment quantization of measuring.Concrete principle is as follows:
In time reading certain value 0 ~ 400 ohm of centre of resistance of sensor, single-chip microcomputer opens Q3 by C_1 end, the pull-up resistor of R3 (200 ohm) is access in sample circuit, now on sensor, voltage change range is between 3.33 ~ 5V, and the quantised samples of this range of voltages being carried out to 400 parts can be more accurate; When reading resistance of sensor at 400 ~ 800 ohm, if pull-up resistor R3 is constant, so on sensor, voltage change range is: between 3.3 ~ 4V, obviously between this scope, carry out 400 parts of quantised samples can compare and be difficult to accurately, the change in voltage especially between 700 ~ 800 between every ohm is less.Single-chip microcomputer now can be allowed to open Q2 by C_2 end, R4 (600 ohm) pull-up resistor is access in sample circuit, now on sensor, voltage change range is between 2 ~ 2.85V, between this voltage range, carry out 400 parts of quantised samples can than more accurate between 3.3 ~ 4V, when sensor is at other Standard resistance ranges, pull-up resistor by that analogy (internal resistance time metal-oxide-semiconductor Q2, Q3 of using in circuit are in conducting is 30m about Ω, negligible on the impact of testing resistance value).
Claims (1)
1. wide-range high-accuracy electrical resistance collection circuit, is characterized in that: include two metal-oxide-semiconductors Q2, Q3, and the grid of metal-oxide-semiconductor Q3 is connected with C_1 terminal, be connected by node one end with pull-up resistor R5, and the drain electrode of metal-oxide-semiconductor Q3 is connected with one end of pull-up resistor R3; The grid of metal-oxide-semiconductor Q2 is connected with C_2 terminal, be connected by node one end with pull-up resistor R6, and the drain electrode of metal-oxide-semiconductor Q2 is connected with one end of pull-up resistor R4; The other end of pull-up resistor R5, R3, R6, R4 is connected successively and is connected with 12V direct supply by node; Metal-oxide-semiconductor Q2, Q3 source electrode is connected and is connected with one end of resistance R8, variable resistor VR respectively by node, and the other end of resistance R8 is connected with R_MCU terminal; C_1, C_2 terminal is all connected with single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520180505.0U CN204495909U (en) | 2015-03-28 | 2015-03-28 | Wide-range high-accuracy electrical resistance collection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520180505.0U CN204495909U (en) | 2015-03-28 | 2015-03-28 | Wide-range high-accuracy electrical resistance collection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204495909U true CN204495909U (en) | 2015-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520180505.0U Expired - Fee Related CN204495909U (en) | 2015-03-28 | 2015-03-28 | Wide-range high-accuracy electrical resistance collection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204495909U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112229427A (en) * | 2020-08-24 | 2021-01-15 | 东风电驱动系统有限公司 | Ultra-large range resistance signal processing system and method |
-
2015
- 2015-03-28 CN CN201520180505.0U patent/CN204495909U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112229427A (en) * | 2020-08-24 | 2021-01-15 | 东风电驱动系统有限公司 | Ultra-large range resistance signal processing system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150722 |