CN203396828U

CN203396828U - Current sensor based on planar Rogowski coil

Info

Publication number: CN203396828U
Application number: CN201320409311.4U
Authority: CN
Inventors: 不公告发明人
Original assignee: BEIJING PASSION TECHNOLOGY Co Ltd
Current assignee: BEIJING PASSION TECHNOLOGY Co Ltd
Priority date: 2013-07-11
Filing date: 2013-07-11
Publication date: 2014-01-15
Anticipated expiration: 2023-07-11

Abstract

A current sensor based on a planar Rogowski coil comprises a housing, a circuit board and a clamping cover, wherein the circuit board is arranged in the housing and sealed through cooperation between the clamping cover and a buckle on the bottom edge of the housing, the circuit board comprises four PCB layers, a winding coil is arranged between the first PCB layer and the second PCB layer, and another winding coil which is identical in turns and cross section area and opposite in winding direction with the above-mentioned winding coil is arranged between the third PCB layer and the fourth PCB layer. The current sensor is simple in process, high in automatic degree, and high in accuracy, ensures consistency of M value, and requires no normal complex wiring process. Two coils are wound on a same PCB in clockwise and counter-clockwise directions, and the influence of external current is eliminated.

Description

A kind of current sensor based on plane Luo-coil

Technical field

The utility model relates to a kind of current sensor, especially a kind of current sensor based on plane Luo-coil technology.

Background technology

Measuring electric current has a variety of methods, and for measuring interchange, the use of mutual inductor is very general.But mutual inductor also has many inconvenient parts: such as electric current is when very large, mutual inductor is easily saturated, and for magnetic circuit is difficult for saturated often iron core is manufactured very large, the coil turn that secondary is surveyed is also a lot, winding volume is also very large, and the mutual inductor volume of wide range is all very large like this.Such mutual inductor volume is large, and Heavy Weight expends a large amount of metal materials, and the iron loss that the iron core of mutual inductor causes is also larger, causes mutual inductor heating, both uneconomical also not environmental protection.Therefore in the urgent need to a kind of sensor that substitutes existing current sensor.

Along with the progress of acquisition technique, Luo-coil has obtained increasing application.Luo-coil technology has many good qualities, without core structure, lightweight, bandwidth, and measuring electric current can be very large.Luo-coil can have various ways to realize, and has flexible Luo-coil also to have hard Luo-coil, has open-type also to have non-open-type, but principle of work is all the same.

Utility model content

The purpose of this utility model is to provide that a kind of technique is simple, automaticity is high, precision is high and has eliminated the current sensor based on plane Luo-coil technology of external interference current impact.

To achieve these goals, the utility model adopts following technical scheme:

A kind of current sensor based on plane Luo-coil, comprise shell, circuit board and Ka Gai, described circuit board setting covers with the mode that the buckle of described shell root edge setting matches in the enclosure and by described Ka Gai, described circuit board comprises four layers of pcb board, and between ground floor pcb board and second layer pcb board, be provided with a winding coil, and between the 3rd layer of pcb board and the 4th layer of pcb board, be provided with identical with above-mentioned coil turn, around to another winding coil contrary and that sectional area is identical.

Preferably, described shell has the endoporus that aperture is 32mm.

Preferably, described circuit board bottom has lead-out terminal.

Preferably, described shell has mounting hole on its base.

Owing to having adopted technique scheme, the utlity model has following beneficial effect:

The utility model overcome common hard Luo-coil be all on annular material, the consistance that is limited to technique, the number of turn and the wire turn of coiling is difficult to be guaranteed, the coefficient of mutual inductance M value of coil is difficult to accomplish strict conformance defect.After adopting PCB plane Luo-coil technology, the line technique of wiring board all adopts computer aided design cad technique, automatically completes wiring, and consistance obtains strict guarantee.And adopt two rewind mutually to plane P CB coil after, can also increase M value, reduce the error that external interference causes simultaneously.

Accompanying drawing explanation

With reference to the following description of accompanying drawing and this preferred implementation, will understand best the utility model and object and advantage, wherein:

Fig. 1 is Luo-coil schematic diagram;

Fig. 2 is the 4 layer circuit board double-winding structure figure that the utility model is used;

Fig. 3 is the utility model product installation diagram.

Embodiment

With reference to accompanying drawing 1 to 3, a kind of current sensor based on plane Luo-coil, and realized on this basis the output of standard signal.Plane Luo-coil technology is on a multi-layer PCB board, with Modern CAD technique, as PROTEL software, draws out coil, forms the agent structure of Luo-coil against two coils.The utility model is used 4 layers of pcb board of standard, on L1 and L2 two-tier circuit plate, build first coil W1, on L3 and L4 two-tier circuit plate, build second coil W2, two coil W1 and W2 are around on the contrary, join end to end, in hole, measured electric current, the number of turn doubles like this, induced voltage doubles, and for hole external disturbance electric current, because W1 and W2 are around to contrary, the interference voltage producing is cancelled each other, and such design can increase useful signal effectively, also can reduce external interference simultaneously.Numeral or analogue integrator that the voltage signal of coil output carries by plate are adjusted the phase place of tested voltage, make its phase of output signal consistent with tested current signal waveform, can reflect in real time the AC wave shape of the tested electric current in former limit.

The principle of work of plane Rogowski coil current sensor is as follows: when perforation that electric current surrounds by coil, and the voltage that Luo-coil induces:

Wherein N is total number of turns, and A is the sectional area of coil, and L is the average length of ring.After these three parameters of Luo-coil are fixed, M is exactly a constant physical parameter, and in order to make the constant coil winding that needs of this parameter enough fine and close and even, it is constant that the sectional area of coil will keep.The output voltage of Luo-coil is relevant to the rate of change (or claiming frequency) of electric current with coefficient of mutual inductance M as can be seen here.The utility model is used same multilayer circuit board, realizes in the circuit board the coiling of two coils.As shown in Figure 2, W1 and W2 are two coils on 4 layers of pcb board, and these two coil turns are identical, around on the contrary.

The utility model has the advantages that: (1) technique is simple energy strict guarantee M value consistance; (2) on same pcb board, realized forward and reverse coiling of 2 groups of coils; (3) automaticity is high, does not need complicated conventional wire winding; (4) eliminated the impact of external interference current, precision is high.

Referring to figs. 1 through 3, use the computer aided design cad softwares such as PROTEL, wiring between the ground floor 2003 of PCB and the second layer 2004, by applying copper straight line 2006 and via hole 2001, wiring continuously, make it form a coil W1, between the 3rd layer 2005 and the 4th layers 2002, second coil W2 made in wiring equally, these two coils around to being contrary, the density of noting wiring while the noting wiring height of will try one's best, to improve total number of turns, improve M value, referring to accompanying drawing 2.The circuit board 3003 of the good coil of cloth assembling comprises lead-out terminal 3007, and the output of plane Rogowski coil current sensor is from this terminal output signal and power supply.It is in the shell 3001 of 32mm endoporus 3002 with aperture that circuit board 3003 is fixed on one, and the card of sensor lid 3004 is fixed by buckle 3006, forms secure fit with shell.Shell 3001 has mounting hole 3005 on its base.

Obviously, above-described embodiment of the present utility model is only for the utility model example is clearly described, and is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, can also make on the basis of the above description other multi-form variation and changes.Here cannot give all embodiments exhaustive.Every still row in protection domain of the present utility model of apparent variation that the technical solution of the utility model amplifies out or change that belong to.

Claims

1. the current sensor based on plane Luo-coil, it is characterized in that, comprise shell, circuit board and Ka Gai, described circuit board setting covers with the mode that the buckle of described shell root edge setting matches in the enclosure and by described Ka Gai, described circuit board comprises four layers of pcb board, and between ground floor pcb board and second layer pcb board, be provided with a winding coil, and between the 3rd layer of pcb board and the 4th layer of pcb board, be provided with identical with above-mentioned coil turn, around to another winding coil contrary and that sectional area is identical.

2. the current sensor based on plane Luo-coil according to claim 1, is characterized in that, described shell has the endoporus that aperture is 32mm.

3. the current sensor based on plane Luo-coil according to claim 1, is characterized in that, described circuit board bottom has lead-out terminal.

4. the current sensor based on plane Luo-coil according to claim 1, is characterized in that, described shell has mounting hole on its base.