CN202494720U - Current detection circuit for soft starter - Google Patents
Current detection circuit for soft starter Download PDFInfo
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- CN202494720U CN202494720U CN2012201583992U CN201220158399U CN202494720U CN 202494720 U CN202494720 U CN 202494720U CN 2012201583992 U CN2012201583992 U CN 2012201583992U CN 201220158399 U CN201220158399 U CN 201220158399U CN 202494720 U CN202494720 U CN 202494720U
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- soft starter
- detection circuit
- linear optical
- current detection
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- 239000007858 starting material Substances 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 4
- 230000008878 coupling Effects 0.000 claims description 19
- 238000010168 coupling process Methods 0.000 claims description 19
- 238000005859 coupling reaction Methods 0.000 claims description 19
- 230000003321 amplification Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The utility model discloses a current detection circuit for a soft starter. The current detection circuit comprises a current diverter, a linear optical coupler, a signal-amplification and voltage-booster circuit, and a single-chip microcomputer which are connected in sequence. The advantages of the current detection circuit of the utility model are as follows: the linear optical coupler is adopted to acquire a voltage signal of a major loop, the voltage signal is proportionally converted into a low voltage signal which can be processed by the single-chip microcomputer, the magnitude of a detected current is calculated by the single-chip microcomputer, the space and metallic materials are saved since the high-precision linear optical coupler is adopted for the detection, the energy consumption is lowered, the volume of the soft starter is smaller, and the maintenance cost is reduced at the same time.
Description
Technical field
The utility model relates to a kind of current detection circuit, and specifically a kind of soft starter current detection circuit belongs to the detection circuit for soft starter field.
Background technology
At present, domestic solid-state soft starter is measured electric current and mainly is to use current transformer.The effect of current transformer is to convert the bigger primary current of numerical value into numerical value less secondary current through certain no-load voltage ratio, is used for protecting, purposes such as measurement.For example no-load voltage ratio is 400/5 current transformer, can be reality that the current transitions of 400A is the electric current of 5A.Yet the detection of present soft starter electric current is to detect through mutual inductor, and the utilization mutual inductor detects electric current and takes up room greatly, is unfavorable for the miniaturization of soft starter.
The utility model content
In order to address the above problem, the utility model has designed a kind of soft starter current detection circuit, and this circuit is gathered the voltage signal of major loop through adopting the high precision linear optical coupling; Voltage signal through proportionally being transformed into the manageable low voltage signal of single-chip microcomputer; The size that calculates the electric current of surveying of logical single-chip microcomputer has been saved space, metal material through the detection of utilization high precision linear optical coupling, has reduced energy consumption; Make the soft starter volume littler, reduced maintenance cost simultaneously.
The technical scheme of the utility model is:
A kind of soft starter current detection circuit comprises the shunt, linear optical coupling, signal amplification boostering circuit and the single-chip microcomputer that link to each other successively.
Described shunt links to each other with soft starter electric current major loop.
Described linear optical coupling is the high precision linear optical coupling, and model is IL300-F-X009.
Described single-chip microcomputer carries out last processing to signal, and the running current that the voltage of certain numerical value is corresponding certain is as the normal operation of demonstration and the various protection work of motor soft starter.
Through above-mentioned four parts, replace traditional current transformer, detect the running current of electric major loop, measuring accuracy is high, has saved the space, has saved the relatively large consumptive material of current transformer simultaneously.
Described linear optical coupling is made up of the photodiode PD1 and the PD2 of a high-performance LED and two adjacent couplings, and these two photodiodes have identical performance parameter.LED is the input end of isolation signals, will be luminous when electric current flows through, and two photodiodes will produce photocurrent when rayed is arranged, and PD1 and PD2 can both obtain approximate illumination from LED, and induce the photocurrent that is proportional to the LED luminous intensity.Photodiode PD1 plays negative feedback, is used to eliminate the error that the non-linear and bias property of LED is brought, and improves linearity and temperature characterisitic between input and output circuit, the stabilizing circuit performance.Photodiode PD2 is the output terminal of linear optical coupling, receives the light that is sent by LED and produces the output current that is directly proportional with light intensity, reaches the effect that electric current is isolated between input and output circuit.
The advantage of the utility model is: adopt the high precision linear optical coupling through gathering the voltage signal of major loop; Voltage signal through proportionally being transformed into the manageable low voltage signal of single-chip microcomputer; The size that calculates the electric current of surveying of logical single-chip microcomputer has been saved space, metal material through the detection of utilization high precision linear optical coupling, has reduced energy consumption; Make the soft starter volume littler, reduced maintenance cost simultaneously.
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment.
Embodiment
Below the preferred embodiment of the utility model is described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the utility model, and be not used in qualification the utility model.
Embodiment 1
As shown in Figure 1, a kind of soft starter current detection circuit comprises the shunt, linear optical coupling, signal amplification boostering circuit and the single-chip microcomputer that link to each other successively.Described shunt links to each other with soft starter electric current major loop.Described linear optical coupling is the high precision linear optical coupling, and model is IL300-F-X009.Described single-chip microcomputer carries out last processing to signal, and the running current that the voltage of certain numerical value is corresponding certain is as the normal operation of demonstration and the various protection work of motor soft starter.
Through above-mentioned four parts, replace traditional current transformer, detect the running current of electric major loop, measuring accuracy is high, has saved the space, has saved the relatively large consumptive material of current transformer simultaneously.
Described linear optical coupling is made up of the photodiode PD1 and the PD2 of a high-performance LED and two adjacent couplings, and these two photodiodes have identical performance parameter.LED is the input end of isolation signals, will be luminous when electric current flows through, and two photodiodes will produce photocurrent when rayed is arranged, and PD1 and PD2 can both obtain approximate illumination from LED, and induce the photocurrent that is proportional to the LED luminous intensity.Photodiode PD1 plays negative feedback, is used to eliminate the error that the non-linear and bias property of LED is brought, and improves linearity and temperature characterisitic between input and output circuit, the stabilizing circuit performance.Photodiode PD2 is the output terminal of linear optical coupling, receives the light that is sent by LED and produces the output current that is directly proportional with light intensity, reaches the effect that electric current is isolated between input and output circuit.
What should explain at last is: the above is merely the preferred embodiment of the utility model; Be not limited to the utility model; Although the utility model has been carried out detailed explanation with reference to previous embodiment; For a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (3)
1. a soft starter current detection circuit is characterized in that: comprise the shunt, linear optical coupling, signal amplification boostering circuit and the single-chip microcomputer that link to each other successively.
2. soft starter current detection circuit according to claim 1 is characterized in that: described shunt links to each other with soft starter electric current major loop.
3. soft starter current detection circuit according to claim 1 and 2 is characterized in that: described linear optical coupling is the linear optical coupling of model IL300-F-X009.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201583992U CN202494720U (en) | 2012-04-16 | 2012-04-16 | Current detection circuit for soft starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201583992U CN202494720U (en) | 2012-04-16 | 2012-04-16 | Current detection circuit for soft starter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202494720U true CN202494720U (en) | 2012-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201583992U Expired - Fee Related CN202494720U (en) | 2012-04-16 | 2012-04-16 | Current detection circuit for soft starter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202494720U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866479A (en) * | 2021-09-23 | 2021-12-31 | 安徽天尚清洁能源科技有限公司 | An isolated current detection circuit and method |
-
2012
- 2012-04-16 CN CN2012201583992U patent/CN202494720U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866479A (en) * | 2021-09-23 | 2021-12-31 | 安徽天尚清洁能源科技有限公司 | An isolated current detection circuit and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121017 Termination date: 20140416 |