CN1784607A - AC current sensor using triac and method thereof - Google Patents
AC current sensor using triac and method thereof Download PDFInfo
- Publication number
- CN1784607A CN1784607A CNA2004800123932A CN200480012393A CN1784607A CN 1784607 A CN1784607 A CN 1784607A CN A2004800123932 A CNA2004800123932 A CN A2004800123932A CN 200480012393 A CN200480012393 A CN 200480012393A CN 1784607 A CN1784607 A CN 1784607A
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- CN
- China
- Prior art keywords
- current
- voltage
- triac
- temperature
- control module
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
- G01R19/15—Indicating the presence of current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/146—Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop
Abstract
An AC current sensor using a triac and a method thereof are disclosed. The AC current sensor includes a triac coupled between conductors through which an AC current flows, a voltage sensing unit for sensing a voltage applied between terminals T1 and T2 of the triac and a control unit for converting a value of the voltage inputted from the voltage sensing unit into a current value using a current versus voltage characteristic of the triac. Since the AC current sensor uses the triac, it can be small-sized and has a simple circuit construction with the manufacturing cost reduced.
Description
Technical field
The present invention relates to a kind of AC (interchange) current sensor, relate in particular to the AC current sensor and the method thereof of a kind of use triac (triac).
Background technology
Traditional AC current sensor makes sensing AC electric currents such as Current Transformer, Hall element, resistance.
The conductor that the conventional AC current sensor that makes Current Transformer flows through around the AC electric current is provided with the magnetic core of an annular, and the primary and secondary coil panel is on this fuse.This AC current sensor comes the sensing primary current by the flow through electric current of secondary coil of measurement.Yet,, therefore increased the size and the production cost of this sensor because such sensor needs magnetic core, primary and secondary circuit, insulating material etc.Simultaneously, because the current value that measures from secondary coil is very little, so need an independent amplifier.Simultaneously, because the saturation characteristic of fuse, its measurement range is too narrow, and secondary output has non-linear.
Use the conventional sensors of Hall element to have a Hall element, this Hall element is arranged in the formed magnetic field of conductor that the AC electric current flows through, and this conventional sensors comes the sensing magnetic field intensity by measuring Hall voltage, that is, and and the electric current of the conductor of flowing through.The shortcoming of such sensor is: Hall element has higher temperature dependency and more expensive relatively.Simultaneously, owing to the level of the voltage that measures from Hall element is very low, thus need an independent amplifier, thus make circuit structure become complicated.
Simultaneously, use the conventional sensors of resistance to have a sensing resistor (sense resistor), this sensing resistor is connected between the conductor that the AC electric current flows through, and this conventional sensors operation is to read the voltage that is applied on the sensing resistor and to be electric current with the voltage transitions that senses.Yet the shortcoming of such sensor is: owing to error appears in the heating of sensing resistor, and measured electric current and the insulativity between the output signal and unreliable and feasible meeting cause fatal infringement to system.In addition, because the resistance value of sensing resistor is very little, so need an independent amplifier.
Summary of the invention
The present invention is devoted to a kind of AC current sensor and method thereof of using triac, and this sensor and method have been eliminated one or more problem that produces owing to the limitation of relevant technologies and shortcoming fully.
An object of the present invention is to provide a kind of AC current sensor and method thereof of using triac, this sensor has little size, has the simple circuit configuration that production cost is reduced, and can carry out the accurate measurement of AC electric current.
According to purpose of the present invention,,, comprising: the triac that between the conductor that the AC electric current flows through, connects as implementing to provide a kind of AC current sensor here with broadly described in order to realize this target and other advantages; Be used for the voltage sensing unit that sensing is applied to voltage between triac T1 and the T2 end; And be used to utilize the current-voltage characteristic of triac will convert the control module of current value to from the magnitude of voltage of voltage sensing unit input.
Control module preferably can provide specific currents to keep triac to connect by the grid to triac.
The AC current sensor preferably also comprises storer, store the voltage versus current lookup table of the voltage-current characteristic data of the triac that comprises under at least 2 temperature conditions, wherein control module utilizes voltage versus current lookup table to convert the magnitude of voltage from the input of voltage sensing unit to current value.
The AC current sensor preferably also comprises temperature sensor, is used for the temperature of sensing triac and the temperature data that senses is sent to control module, and wherein control module receives the temperature data sense and the current value after the calibration shift.Here, the correction of current value is to use the method for linear interpolation to carry out.
The AC current sensor preferably also comprises signal processing unit, is used for removing DC (direct current) component from the analog voltage signal of voltage sensing unit input, and this analog voltage signal is converted to digital voltage signal and exports this digital voltage signal to control module.
According to another aspect of the present invention, a kind of AC current sense method of using triac is provided, comprise step: (a) triac is connected between the conductor that the AC electric current flows through, (b) applying specific currents by the grid to triac makes triac keep connecting, (c) sensing is applied to the voltage of triac T1 and T2 end, (d) utilizes the current-voltage characteristic of triac that the voltage transitions that senses is become current value.
Step (d) is preferably utilized the voltage versus current lookup table of the voltage-current characteristic data that comprise the triac under at least two kinds of temperature conditions.
AC current sense method preferably also comprises step: (e) temperature of sensing triac, and the current value that (f) utilizes conversion in the temperature data aligning step (d) that senses.Here, the correction of the current value in the step (f) is to use linear interpolation to carry out.
Because AC current sensor according to the present invention has used triac, it can be miniaturized and reduce production costs, and because do not need amplifier, its circuit structure also can access simplification.
Other advantage, purpose and feature of the present invention partly set forth description below, and for those skilled in the art, by becoming clear to following inspection or can from enforcement of the present invention, obtaining understanding.Purpose of the present invention and other advantages will realize and reach by written description and claim and accompanying drawing specifically noted structure.
Description of drawings
In conjunction with the drawings the preferred embodiments of the present invention are described, above-mentioned purpose of the present invention, other characteristics and advantage will become apparent, wherein:
Fig. 1 is the block scheme that the structure of AC current sensor according to a preferred embodiment of the invention schematically is described;
Fig. 2 is the chart of the current-voltage characteristic of explanation triac when on-state;
Fig. 3 is the chart of the temperature current characteristic of explanation triac when on-state;
Fig. 4 is the figure that voltage versus current lookup table according to a preferred embodiment of the invention is described; And
Fig. 5 is the process flow diagram that the operating process of AC current sensor according to a preferred embodiment of the invention is described.
Embodiment
Now, describe according to a preferred embodiment of the invention system that is used for the distribute digital content and method thereof with reference to the accompanying drawings in detail.
Fig. 1 is the block scheme that AC current sensor structure according to a preferred embodiment of the invention schematically is described.
With reference to Fig. 1, AC current sensor 100 comprises triac 10, voltage sensing unit 12, signal processing unit 14, control module 16, temperature sensor 18 and storer 20.
Before describing AC current sensor 100 in detail, with the operating characteristic of brief description triac 10.
Triac 10 is ovonics, that is, bidirectional triode thyristor is applied on its grid if surpass the electric current of scheduled volume, and then this triac 10 is connected to connect two end T1 and T2.Below, the voltage-current characteristic of triac describes with reference to Fig. 2 and Fig. 3.
Fig. 2 is the chart of the current-voltage characteristic of explanation triac when on-state.As shown in Figure 2, electric current proportional ground wire rising along with the growth that is applied to the voltage between triac T1 end and the T2 end.In addition, as can be seen, also change according to the temperature change of triac according to the current value of the voltage that applies.
Fig. 3 is the chart of the temperature current characteristic of explanation triac when on-state.As shown in Figure 3, electric current increasing and proportional ground wire rising along with the triac temperature.
Therefore, as can be seen, the electric current of triac is according to the change of voltage and temperature and linear the change.
To illustrate now according to AC current sensor 100 of the present invention.At first, triac 10 is connected between a plurality of conductors 1 that the AC electric current flows through.In this case, preferably the positive pole (+) of conductor links to each other with the T1 end with the T2 end of triac respectively with negative pole (-).Simultaneously, the grid G of triac links to each other with control module 16, and this control module 16 applies the particular current value so that triac keeps connecting to the grid of triac.
The operation of each ingredient of control module 16 control AC current sensors 100, and the temperature of temperature sensor 18 sensing the triacs 10 and temperature that senses sent to control module 16.The voltage versus current lookup table that memory stores illustrates after a while.In addition, control module 16 uses from the digital voltage signal of signal processing unit 14 inputs, from the temperature data of temperature sensor 18 inputs and be stored in voltage versus current lookup table the storer 20, determines output current value Io.
Fig. 4 is the figure that voltage versus current lookup table according to a preferred embodiment of the invention is described.
With reference to Fig. 4, be respectively-40 ℃ in the temperature of triac 10, under the condition of 20 ℃ and 80 ℃, shown current value corresponding to the magnitude of voltage of triac 10.In an embodiment of the present invention, based on current-voltage characteristic curve shown in Figure 2, prepared voltage versus current lookup table shown in Figure 4.
In this case, if the data set in input voltage data or temperature data and the voltage versus current lookup table is inconsistent, then control module is determined output current Io according to linear interpolation.As mentioned above, because under the state that triac is connected, the electric current relative voltage and the temperature of triac have linear relationship, use linear interpolation to determine that the error that produces during the output current Io is very small, can ignore.
Determining of the output current that uses linear interpolation will be described below in further detail.
Suppose output current be voltage V and temperature T function I (V, T), if the temperature T of triac is T=T
0And voltage V is V
0And V
1Between value, can use following equation to calculate output current I (V, T so
0).
[equation 1]
Here, I (V
0) and I (V
1) be I (V
0, T
0) and I (V
1, T
0) reduced representation, and V
0, V
1, I (V
0, T
0) and I (V
1, T
0) be the data set in the voltage versus current lookup table.
Similarly, if magnitude of voltage V is V=V
0, temperature value T is T
0And T
1Between value, can use following equation to calculate output current I (V so
0, T).
[equation 2]
Here, I (T
0), I (T
1) be I (V
0, T
0) and I (V
0, T
1) reduced representation, and V
0, V
1, I (V
0, T
0) and I (V
0, T
1) be the data set in the voltage versus current lookup table.
Below, with the operation that describes in detail as the AC current sensor 100 of above-mentioned structure.
Fig. 5 is the process flow diagram that the operating process of AC current sensor according to a preferred embodiment of the invention is described.
With reference to Fig. 5, after triac is connected between the conductor that the AC electric current flows through, the voltage that is applied between triac T1 end and the T2 end is carried out sensing (step 10) under the state that triac is connected.Then, from the simulation AC voltage signal that senses, remove DC component (step 12).Then, the simulation AC voltage signal of having removed the DC component is converted to digital voltage signal (step 14).Then, working voltage electric current look-up table is converted to current value (step 16) with this magnitude of voltage.At this moment, temperature data is set as particular value (for example, 20 ℃).Simultaneously, if the magnitude of voltage that is provided with in the magnitude of voltage of the digital voltage signal of input and the voltage versus current lookup table is inconsistent, then use equation 1 represented linear interpolation method to determine current value.
, the temperature of triac carried out sensing (step 18) thereafter, and based on the sensed temperature data, to proofreading and correct (step 20) at the current value of step 16 conversion.That is: the deviation to the caused current value of difference between the actual temperature of employed specified temp of step 16 (for example, 20 ℃) and triac compensates.In this case, the deviation compensation of current value can use equation 2 represented linear interpolations to carry out.Then, export the current value of this correction to finish AC current sense process.
Therefore as mentioned above, according to the present invention, AC current sensor according to the present invention has used triac, and can miniaturization and reduce production costs.In addition, AC current sensor according to the present invention has used linear current-to-voltage characteristics, and compare the intensity of current value of its sensing with conventional sensors bigger, therefore do not need independent amplifier.
Aforesaid embodiment is exemplary, and it is of the present invention to be understood as restriction.This method can be applied on the device of other types easily.Description of the invention is illustrative, does not limit the scope of the claims.Many replacements, modifications and variations are obvious for a person skilled in the art.
Claims (11)
1, a kind of AC current sensor comprises:
Be connected the triac between the conductor that the AC electric current flows through;
The voltage sensing unit is used for sensing and is applied to voltage between described triac T1 end and the T2 end; And
Control module is used to utilize the current-voltage characteristic of described triac, will be converted to current value from the magnitude of voltage of described voltage sensing unit input.
2, AC current sensor according to claim 1, wherein, described control module applies particular current by the grid to described triac, makes described triac keep connecting.
3, AC current sensor according to claim 1 also comprises storer, and the voltage versus current lookup table that comprises the voltage-current characteristic data of the described triac under at least 2 temperature conditions is stored in this storer;
Wherein, described control module utilizes described voltage versus current lookup table to be converted to current value from the magnitude of voltage of described voltage sensing unit input.
4, according to each described AC current sensor in the claim 1 to 3, also comprise temperature sensor, be used for the temperature of the described triac of sensing and the temperature data that senses is sent to described control module;
Wherein, the current value after described control module receives the described temperature data that senses and proofreaies and correct described conversion.
5, AC current sensor according to claim 4, wherein, the correction of described current value uses linear interpolation to carry out.
6, AC current sensor according to claim 1, also comprise signal processing unit, be used for removing the DC component, this analog voltage signal is converted to digital voltage signal and exports this digital voltage signal to described control module from the analog voltage signal of described voltage sensing unit input.
7, a kind of power-supply device comprises each described AC current sensor in the claim 1 to 6.
8, a kind of AC current sense method of using triac comprises step:
(a) described triac is connected between a plurality of conductors that the AC electric current flows through;
(b) applying particular current by the grid to described triac makes described triac keep connecting;
(c) sensing is applied to the voltage between described triac T1 and the T2 end;
(d) utilize the current-voltage characteristic of described triac that the described magnitude of voltage that senses is converted to current value.
9, AC current sense method according to claim 8, wherein, described step (d) has been used the voltage versus current lookup table of the described voltage-current characteristic data of the described triac that comprises under at least 2 kinds of temperature conditions.
10, AC current sense method according to claim 8 also comprises step:
(e) temperature of the described triac of sensing, and
(f) use the described current value of changing in the described step of the described sensed temperature adjustment of data (d).
11, AC current sense method according to claim 9 wherein, uses linear interpolation to come the described current value in the described step (f) is proofreaied and correct.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030062477 | 2003-09-08 | ||
| KR10-2003-0062477A KR100515871B1 (en) | 2003-09-08 | 2003-09-08 | Ac current sensor using triac and mehod thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1784607A true CN1784607A (en) | 2006-06-07 |
| CN100501420C CN100501420C (en) | 2009-06-17 |
Family
ID=36773845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800123932A Expired - Fee Related CN100501420C (en) | 2003-09-08 | 2004-09-07 | AC current sensor and method thereof, power supply using the AC current sensor |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR100515871B1 (en) |
| CN (1) | CN100501420C (en) |
| TW (1) | TW200510733A (en) |
| WO (1) | WO2005024444A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199166A (en) * | 2016-07-11 | 2016-12-07 | 深圳市知用电子有限公司 | A kind of method and device of current measurement |
| CN106556732A (en) * | 2015-09-30 | 2017-04-05 | 中兴通讯股份有限公司 | Current detection circuit and electric current detecting method |
| CN106771540A (en) * | 2016-12-23 | 2017-05-31 | 建荣半导体（深圳）有限公司 | A kind of current detection circuit and its method, chip and power-supply device |
| CN106855588A (en) * | 2016-12-23 | 2017-06-16 | 建荣半导体（深圳）有限公司 | A kind of current detecting chip, power-supply device and electronic equipment |
| CN106950418A (en) * | 2017-03-21 | 2017-07-14 | 深圳市复兴伟业技术有限公司 | The determination methods of bidirectional triode thyristor alternating current break-make |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006058879A1 (en) * | 2006-12-13 | 2008-06-26 | Siemens Ag | Measuring device for measuring an electric current |
| KR102111557B1 (en) * | 2014-03-17 | 2020-05-15 | 엘에스일렉트릭(주) | Current measuring device and operating method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61122578A (en) * | 1984-11-20 | 1986-06-10 | Mitsubishi Electric Corp | Power supply circuit |
| JPH0427877A (en) * | 1990-04-20 | 1992-01-30 | Koji Yatsuhashi | Current checker |
-
2003
- 2003-09-08 KR KR10-2003-0062477A patent/KR100515871B1/en not_active IP Right Cessation
-
2004
- 2004-09-06 TW TW093126924A patent/TW200510733A/en unknown
- 2004-09-07 WO PCT/KR2004/002260 patent/WO2005024444A1/en active Application Filing
- 2004-09-07 CN CNB2004800123932A patent/CN100501420C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106556732A (en) * | 2015-09-30 | 2017-04-05 | 中兴通讯股份有限公司 | Current detection circuit and electric current detecting method |
| CN106199166A (en) * | 2016-07-11 | 2016-12-07 | 深圳市知用电子有限公司 | A kind of method and device of current measurement |
| CN106771540A (en) * | 2016-12-23 | 2017-05-31 | 建荣半导体（深圳）有限公司 | A kind of current detection circuit and its method, chip and power-supply device |
| CN106855588A (en) * | 2016-12-23 | 2017-06-16 | 建荣半导体（深圳）有限公司 | A kind of current detecting chip, power-supply device and electronic equipment |
| CN106771540B (en) * | 2016-12-23 | 2023-09-29 | 建荣半导体（深圳）有限公司 | Current detection circuit and method thereof, chip and power supply equipment |
| CN106855588B (en) * | 2016-12-23 | 2023-10-03 | 建荣半导体（深圳）有限公司 | Current detection chip, power supply equipment and electronic equipment |
| CN106950418A (en) * | 2017-03-21 | 2017-07-14 | 深圳市复兴伟业技术有限公司 | The determination methods of bidirectional triode thyristor alternating current break-make |
| CN106950418B (en) * | 2017-03-21 | 2019-05-17 | 深圳市复兴伟业技术有限公司 | The judgment method of bidirectional triode thyristor alternating current on-off |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200510733A (en) | 2005-03-16 |
| WO2005024444A1 (en) | 2005-03-17 |
| KR100515871B1 (en) | 2005-09-20 |
| CN100501420C (en) | 2009-06-17 |
| KR20050025687A (en) | 2005-03-14 |
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Granted publication date: 20090617 Termination date: 20110907 |