CN201477158U - Element resistance value detection circuit - Google Patents
Element resistance value detection circuit Download PDFInfo
- Publication number
- CN201477158U CN201477158U CN2009201678331U CN200920167833U CN201477158U CN 201477158 U CN201477158 U CN 201477158U CN 2009201678331 U CN2009201678331 U CN 2009201678331U CN 200920167833 U CN200920167833 U CN 200920167833U CN 201477158 U CN201477158 U CN 201477158U
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- Prior art keywords
- resistance
- resistance value
- utility
- precision
- circuit
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- Expired - Fee Related
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Abstract
The utility model discloses an element resistance value detection circuit, which is characterized in that after being connected with a charging resistance and a capacitance, a single chip is grounded, the single chip is also connected with a high-precision reference resistance connected with the charging resistance in parallel. The utility model adopts the common single chip without ADC to recharge the common capacitance, and computes the resistance value of the element to be detected through the obtained charge-discharge time, and the high-precision resistance is used as the reference resistance to reduce the offset caused by the circuit and capacitance error, thereby further improving the precision of the detection and greatly improving the detection accuracy.
Description
Technical field
The utility model relates to the electric circuit inspection technology, is specifically related to the circuit that a kind of resistance value that is used for element detects.
Background technology
In the toy circuit, often finish certain action automatically by control circuit control toy, control circuit need detect the some or several voltages or the current signal of reflection electric equipment duty, with this as the foundation of sending control signal, in some circuit, the voltage of reflection circuit state or current signal can't directly be measured and obtain, and need realize by specific testing circuit.
The existing circuit that the resistance value of element is detected, mostly be to utilize single-chip microcomputer to realize in conjunction with the ADC detection port, but the single-chip microcomputer of band ADC is relatively expensive, it is higher to be used for the toy cost, bigger with time error, the accuracy of detection of ADC single-chip microcomputer is subject to the influence of fluctuations of supply voltage, is further improved.
The utility model content
The purpose of this utility model provides the component resistance value testing circuit that a kind of accuracy improves.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of component resistance value testing circuit, ground connection behind single-chip microcomputer connection charging resistor and the electric capacity also is connected with the high precision reference resistance in parallel with charging resistor on the single-chip microcomputer.
The beneficial effects of the utility model are: utilize the common single-chip microcomputer that does not contain ADC that common electric capacity is charged, calculate the size of measured resistance value by the time of discharging and recharging that obtains, and do reference resistance with the higher resistance of precision, reduce the deviation that the circuit capacitance error causes, further improve the precision of test, accuracy in detection is improved greatly.
Description of drawings
Fig. 1 is the structural representation of the utility model master apparent direction.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
With reference to shown in Figure 1, a kind of component resistance value testing circuit, the common MCU single-chip microcomputer 1 with ADC does not connect charging resistor 2 and common electric capacity 3 back ground connection, also be connected with the high precision reference resistance 4 in parallel on the single-chip microcomputer 1 with charging resistor 2, during work, measured resistance 5 is connected in parallel in the single-chip microcomputer 1 detects, electric capacity 3 is charged, calculate the size of measured resistance 5 values by the time of discharging and recharging that obtains, and do reference resistance 4 with the higher resistance of precision, reduce the deviation that the circuit capacitance error causes, further improve the precision of test, accuracy in detection is improved greatly.
The foregoing description is illustrative principle of the present utility model and effect thereof only; and the embodiment of part utilization; for the person of ordinary skill of the art; under the prerequisite that does not break away from the utility model creation design; can also make some distortion and improvement, these all belong to protection domain of the present utility model.
Claims (1)
1. component resistance value testing circuit is characterized in that: single-chip microcomputer (1) connects charging resistor (2) and electric capacity (3) ground connection afterwards, also is connected with the high precision reference resistance (4) in parallel with charging resistor (2) on the single-chip microcomputer (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201678331U CN201477158U (en) | 2009-07-30 | 2009-07-30 | Element resistance value detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201678331U CN201477158U (en) | 2009-07-30 | 2009-07-30 | Element resistance value detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201477158U true CN201477158U (en) | 2010-05-19 |
Family
ID=42413411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201678331U Expired - Fee Related CN201477158U (en) | 2009-07-30 | 2009-07-30 | Element resistance value detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201477158U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656140A (en) * | 2017-08-11 | 2018-02-02 | 中国科学院地质与地球物理研究所 | A kind of method and circuit that resistance is measured using embeded processor digital port |
| CN109188095A (en) * | 2018-10-11 | 2019-01-11 | 深圳和而泰智能控制股份有限公司 | A kind of resistance measuring circuit, method and environmental parameter measuring device |
-
2009
- 2009-07-30 CN CN2009201678331U patent/CN201477158U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656140A (en) * | 2017-08-11 | 2018-02-02 | 中国科学院地质与地球物理研究所 | A kind of method and circuit that resistance is measured using embeded processor digital port |
| CN107656140B (en) * | 2017-08-11 | 2019-06-18 | 中国科学院地质与地球物理研究所 | A kind of method and circuit using embeded processor digital port measurement resistance |
| CN109188095A (en) * | 2018-10-11 | 2019-01-11 | 深圳和而泰智能控制股份有限公司 | A kind of resistance measuring circuit, method and environmental parameter measuring device |
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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 |
Granted publication date: 20100519 Termination date: 20140730 |
|
| EXPY | Termination of patent right or utility model |