CN103969496A - Current sampling circuit - Google Patents
Current sampling circuit Download PDFInfo
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- CN103969496A CN103969496A CN201410235701.3A CN201410235701A CN103969496A CN 103969496 A CN103969496 A CN 103969496A CN 201410235701 A CN201410235701 A CN 201410235701A CN 103969496 A CN103969496 A CN 103969496A
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Abstract
The invention provides a current sampling circuit. The current sampling circuit comprises a main inductor, a Hall sampling sensor and a signal processing circuit, wherein the main inductor comprises first windings which are connected in parallel; each first winding consists of winding wires with the same thickness and the same number of strands, and the two first windings connected in parallel are connected with the input end of the main inductor; the Hall sampling sensor is connected with the output end of one path of first winding in the main inductor and is used for sampling one path of inductive current of the main inductor; the signal processing circuit is connected with the Hall sampling sensor, and is used for filtering one path of inductive current sampled by the Hall sampling sensor and calculating to obtain the size of current passing through the main inductor. The current sampling circuit with the Hall sampling sensor with a small range can be used for sampling large-component current accurately, and thus the problem that an expensive current sensor with a large range needs to be bought for sampling large-component current accurately but is in short supply in the prior art is solved.
Description
Technical field
The present invention relates to electric circuit inspection technical field, specifically be a kind of current sampling circuit.
Background technology
In current design of electronic circuits process, often can run into and need the flow through situation of size of current of sampling circuit, common current sample method to comprise three kinds of resistance sampling, current transformer sampling and the samplings of Hall sampling sensor, wherein, resistance sampling is simple to operate, but loss is large; Current transformer method of sampling complexity and current measurement are unstable; And the sample rate current degree of accuracy of Hall sampling sensor is high, but corresponding cost is also higher.
Nowadays the development of society's science and technology, people more and more pursue finished things, no exception in the testing process of Switching Power Supply topology circuit, increasing along with Switching Power Supply power, its sampling circuit is generally with larger DC component, also in order to obtain more really accurate sample rate current, more and more people adopt the Hall sampling sensor being comprised of Hall HCT element to carry out the current sample of circuit, because the price of Hall sampling sensor itself is just not low, and the larger current sensor of range is expensive especially, and the producer producing is less, the situation that often occurs source of goods anxiety.Therefore be necessary to provide a kind of can be with the circuit of the accurate sampling switch source current of Hall sampling sensor compared with small-range.
Summary of the invention
Technical matters to be solved by this invention is: the circuit that provides a kind of circuit consisting of the Hall sampling sensor compared with small-range just can precisely sample large current weight, solving prior art is the large current weight of precisely sampling, must the wide range current sensor of purchasing price costliness and the problem of current sensor source of goods anxiety.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A current sampling circuit, comprises main inductance, Hall sampling sensor and signal processing circuit; Described main inductance comprises two-way in parallel the first winding, and the coiling identical by thickness, that number of share of stock is identical of described the first winding forms, and two-way first winding of described parallel connection is connected with the input end of main inductance;
Described Hall sampling sensor is connected with the output terminal of described main inductance Zhong mono-tunnel the first winding, for the main inductance Yi road inductive current of sampling;
Described signal processing circuit connects described Hall sampling sensor, for Hall sampling sensor sampling Yi road inductive current is carried out, after filtering processing, calculating the size of current that flows through main inductance.
Beneficial effect of the present invention is: a kind of current sampling circuit provided by the invention, when being different from Hall sampling sensor that prior art need to apply to wide range and carrying out the current sample of circuit, the Hall sampling sensor that often need to consider wide range is expensive, and production firm is few, the problem of source of goods anxiety, the present invention is divided into relatively impartial two-way inductive current by two-way the first winding in parallel in main inductance by electric current, just can use compared with the Hall element sampling of the small-range inductive current on a road wherein, after the processing of signal processing circuit, obtain again the sampled data of large component inductive current.The simple electric current that realization consists of the Hall sampling sensor compared with small-range just can be sampled and be obtained large component inductive current, the current sampling circuit cost of invention is low, and detecting precision is substantially constant, without cost, buys under-supply wide range Hall sampling sensor.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of current sampling circuit of the embodiment of the present invention;
Fig. 2 is the circuit diagram of a kind of current sampling circuit one embodiment of the embodiment of the present invention.
Label declaration:
Main inductance L1; Hall sampling sensor H1; Current sharing inductor L2;
The first winding L 1-1; The second winding L 2-1.
Embodiment
By describing technology contents of the present invention, structural attitude in detail, being realized object and effect, below in conjunction with embodiment and coordinate accompanying drawing to be explained in detail.
The design of most critical of the present invention is: after by the two-way winding of main inductance parallel connection, inductive current being shunted for the first time, after inductive current being divided into two-way through current sharing inductor again, export, the Hall sampling sensor inductive current on a road just can obtain the sampling size of inductive current of only need sampling like this, and cost is lower, realization just may complete the sampling of large component inductive current with the Hall sampling sensor of small-range, and without buying costliness and source of goods wide range Hall sampling sensor in short supply.
Referring to Fig. 1, is the circuit diagram of a kind of current sampling circuit of the embodiment of the present invention.
A current sampling circuit, comprises main inductance L1, Hall sampling sensor H1 and signal processing circuit; Described main inductance L1 comprises two-way in parallel the first winding L 1-1, and described the first winding L 1-1 is identical by thickness, that number of share of stock is identical, and coiling forms, and the two-way first winding L 1-1 of described parallel connection is connected with the input end of main inductance L1;
Described Hall sampling sensor H1 is connected with the output terminal of described main inductance L1 Zhong mono-tunnel the first winding L 1-1, for the main inductance L1 mono-road inductive current of sampling;
Described signal processing circuit connects described Hall sampling sensor H1, for Hall sampling sensor H1 sampling Yi road inductive current is carried out, after filtering processing, calculating the size of current that flows through main inductance L1.
From foregoing description, beneficial effect of the present invention is: main inductance L1 is divided into two-way the first winding L 1-1 being connected in parallel, because the winding coiling identical by thickness, that number of share of stock is identical of described two-way forms, its structure has determined the electric current by main inductance L1 to be divided into the two-way inductive current of equity relatively, so only need connect wherein Yi road the first winding L 1-1 output terminal with Hall sampling sensor H1, carry out the collection of electric current, then after the calculating of signal processing circuit, can draw the electric current of the main inductance L1 that flows through.Current sampling circuit of the present invention, energy realization uses the relatively low small-range Hall sampling sensor H1 of price to measure originally need to be by the getable measurement result of expensive wide range Hall sampling sensor H1, can easily the sample problem of large component inductive current, the wide range Hall sampling sensor H1 of cost purchasing price costliness more again, and can avoid the wide range Hall sampling sensor H1 not enough problem of supplying.
Referring to Fig. 2, is the circuit diagram of a kind of current sampling circuit one embodiment of the embodiment of the present invention.
Further, described current sample electric current also comprises current sharing inductor L2, and described main inductance L1 is connected with described Hall sampling sensor H1 after connecting current sharing inductor L2;
Described current sharing inductor L2 comprises two the second winding L 2-1 in parallel, and described the second winding L 2-1 is identical by thickness, that number of share of stock is identical, and coiling forms;
Two the second winding L 2-1 in parallel of described current sharing inductor L2 connect respectively two-way the first winding L 1-1 of main inductance L1, cross the electric current of the second winding L 2-1 for equiulbrium flow;
The output terminal of a second winding L 2-1 of described current sharing inductor L2 connects Hall sampling sensor H1.
Current collection circuit described in this programme, on the basis of such scheme, improve the accuracy of the inductive current gathering, by the output terminal at main inductance L1, connect current sharing inductor L2, utilize equal flow phenomenon that the architectural characteristic of two the second coilings that winding L 2-1 is identical by thickness, number of share of stock is identical in parallel of current sharing inductor L2 produces can guarantee the inductive current of balanced two-way, guarantee that it is reciprocity that the two-way of exporting is sampled inductive current after the equilibrium distribution through main inductance L1 and current sharing inductor L2.Concrete, the current-sharing principle of current sharing inductor L2 has determined, when the electric current of one of them the second winding L 2-1 of the current sharing inductor L2 that flows through is larger, the magnetic field that in current sharing inductor L2, the magnetic core of two the second winding L 2-1 produces cannot be offset completely, the magnetic field having more will produce contrary electric field in two the second winding L 2-1, make the Current rise of the second winding L 2-1 that another electric current of flowing through is less, the electric current of the second winding L 2-1 that inductive current is larger declines, until the current balance type equalization of two the second winding L 2-1.By current sharing inductor L2, divide equally for the second time inductive current, assurance is sampled circuital current and is divided into uniformly bisection, pass through again the wherein inductive current on a road of Hall sampling sensor H1 sampling, after calculating finally by mistake signal processing circuit, just can obtain being easily sampled the total inductance sample rate current of electric current, reach with small-range Hall sampling sensor H1 and survey the object that obtains large sample rate current.
Further, two-way in parallel the first winding L 1-1 of described main inductance L1 is Double-wire parallel wound winding.The first winding L 1-1 in main inductance L1 adopts the mode of Double-wire parallel wound to form, can well eliminate the self-induction of coil, greatly reduce remaining inductance, guarantee to flow out the electric current that the disastrously assorted self-induction of inductive current of main inductance L1 produces, and then guarantee the accuracy of the inductive current that samples.
Further, two of described current sharing inductor L2 the second winding L 2-1 in parallel are Double-wire parallel wound winding.The second winding L 2-1 in current sharing inductor L2 adopts the mode of Double-wire parallel wound to form, can well eliminate the self-induction of coil, greatly reduce remaining inductance, guarantee to flow out the electric current that the disastrously assorted self-induction of inductive current of current sharing inductor L2 produces, and then guarantee the accuracy of the inductive current that samples.
Further, described main inductance L1 is ferrocart core inductance.Main inductance L1 in current sampling circuit adopts the inductance of ferrocart core iron core material, utilize ferrocart core can autonomous demagnetization, the characteristic of high, the permanent magnetic conduction of saturation magnetic flux density, not only cheap, be convenient to popularize, can also completely cut off eddy current, increase inductance value, well stablize magnetic permeability, can not make magnetic energy power because the variation of temperature changes, make the inductive current of sampling more accurate.
Further, described main inductance L1 is sendust core inductance.Main inductance L1 in current sampling circuit adopts the inductance of iron ferro-silico aluminium core matter, sendust core has good failure tolerance, soft saturation degree, very low core loss and temperature stability, can be not abnormal owing to just not occurring in the place of safety of decline curve, can be owing to occurring after long-time use that core loss affects sampling inductive current accuracy yet.
Further, described current sharing inductor L2 is ferrocart core inductance.Current sharing inductor L2 in current sampling circuit adopts the inductance of ferrocart core iron core material, utilize ferrocart core can autonomous demagnetization, the characteristic of high, the permanent magnetic conduction of saturation magnetic flux density, not only cheap, be convenient to popularize, can also completely cut off eddy current, increase inductance value, well stablize magnetic permeability, can not make magnetic energy power because the variation of temperature changes, make the inductive current of sampling more accurate.
Further, described current sharing inductor L2 is sendust core inductance.Current sharing inductor L2 in current sampling circuit adopts the inductance of iron ferro-silico aluminium core matter, sendust core has good failure tolerance, soft saturation degree, very low core loss and temperature stability, can be not abnormal owing to just not occurring in the place of safety of decline curve, can be owing to occurring after long-time use that core loss affects sampling inductive current accuracy yet.
Further, described current sharing inductor L2 is FERRITE CORE inductance.Current sharing inductor L2 in current sampling circuit adopts the inductance of ferrite iron core material, FERRITE CORE has very high magnetic permeability, low cost, very low core loss and temperature stability preferably, for current sharing inductor L2 successful, due to current sharing inductor L2 two winding magnetic field basic neutralisations, so ferrite inductance does not need to worry magnetic saturation problem.
In sum, a kind of current sample electric current provided by the invention, can not only realize just can precisely the sample circuit of large current weight with the Hall sampling sensor H1 compared with small-range, and it is simple in structure, cost is low, convenient production popularized utilization, further, by twice, divide equally after inductive current, the accuracy of the sampling inductive current that assurance finally records, and the first winding L 1-1 of main inductance L1 and the second winding L 2-1 of current sharing inductor L2 are by adopting the structure of Double-wire parallel wound, the maximized elimination self-induction of loop of energy, guarantee the accuracy of inductive current, the common current sampling circuit that forms the low-cost pin-point accuracy of the large component inductive current of the convenient sampling of a kind of energy.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (9)
1. a current sampling circuit, is characterized in that, comprises main inductance, Hall sampling sensor and signal processing circuit; Described main inductance comprises two-way in parallel the first winding, and the coiling identical by thickness, that number of share of stock is identical of described the first winding forms, and two-way first winding of described parallel connection is connected with the input end of main inductance;
Described Hall sampling sensor is connected with the output terminal of described main inductance Zhong mono-tunnel the first winding, for the main inductance Yi road inductive current of sampling;
Described signal processing circuit connects described Hall sampling sensor, for Hall sampling sensor sampling Yi road inductive current is carried out, after filtering processing, calculating the size of current that flows through main inductance.
2. a kind of current sampling circuit according to claim 1, is characterized in that, described current sample electric current also comprises current sharing inductor, and described main inductance is connected with described Hall sampling sensor after connecting current sharing inductor;
Described current sharing inductor comprises two the second windings in parallel, and the coiling identical by thickness, that number of share of stock is identical of described the second winding forms;
Two the second windings in parallel of described current sharing inductor connect respectively two-way first winding of main inductance, cross the electric current of the second winding for equiulbrium flow;
The output terminal of second winding of described current sharing inductor connects Hall sampling sensor.
3. a kind of current sampling circuit according to claim 1, is characterized in that, two-way in parallel first winding of described main inductance is Double-wire parallel wound winding.
4. a kind of current sampling circuit according to claim 2, is characterized in that, two the second windings in parallel of described current sharing inductor are Double-wire parallel wound winding.
5. a kind of current sampling circuit according to claim 1, is characterized in that, described main inductance is ferrocart core inductance.
6. a kind of current sampling circuit according to claim 1, is characterized in that, described main inductance is sendust core inductance.
7. a kind of current sampling circuit according to claim 2, is characterized in that, described current sharing inductor is ferrocart core inductance.
8. a kind of current sampling circuit according to claim 2, is characterized in that, described current sharing inductor is sendust core inductance.
9. a kind of current sampling circuit according to claim 2, is characterized in that, described current sharing inductor is FERRITE CORE inductance.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107887930A (en) * | 2017-12-22 | 2018-04-06 | 湖南科比特新能源科技股份有限公司 | A kind of grid-connected inverter circuit to be generated electricity under photovoltaic DC-to-AC converter low light condition |
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| CN107887930A (en) * | 2017-12-22 | 2018-04-06 | 湖南科比特新能源科技股份有限公司 | A kind of grid-connected inverter circuit to be generated electricity under photovoltaic DC-to-AC converter low light condition |
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Address after: Nanshan District Ma Liuzhou Industrial Zone of Shenzhen City, Guangdong province 518052 77 two or three storey Applicant after: Shenzhen increte Polytron Technologies Inc Address before: Nanshan District Ma Liuzhou Industrial Zone Shenzhen city Guangdong province 518000 building 77 Applicant before: Shenzhen Increase Technology Development Co., Ltd. |
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Application publication date: 20140806 |
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