CN201069452Y

CN201069452Y - Current detection device

Info

Publication number: CN201069452Y
Application number: CNU2007201512962U
Authority: CN
Inventors: 潘正友
Original assignee: YIJING TECHNOLOGY Co Ltd
Current assignee: YIJING TECHNOLOGY Co Ltd; Yujing Technology Co Ltd
Priority date: 2007-06-12
Filing date: 2007-06-12
Publication date: 2008-06-04
Anticipated expiration: 2017-06-12

Abstract

The utility model discloses a current detector which comprises a circuit substrate, an iron core, a coil holder, and a Hall assembly. A circuit configuration is preset on one side surface of the circuit substrate. At least one main coil is enwound around the iron core. The two ends of a main coil are independently connected with the circuit substrate. The iron core is positioned on the other side surface of the circuit substrate, while the axial direction of the iron core is substantially vertical to the circuit substrate. The coil holder is connected with one end of the iron core and enwound with a plurality of adjuvant coils in a way that the axial direction of the adjuvant coil is substantially parallel to that of the iron core. The Hall assembly is connected onto the circuit configuration and positioned in the axial directions of the iron core and the adjuvant coil. Based on the use characteristics of Hall assembly (i.e. the magnetic flux density is in direct proportional to the current flow), the utility model can measure the current value.

Description

Current sensing means

Technical field

The utility model relates to a kind of current sensing means, is meant a kind of current sensing means of measuring current value on the circuit substrate that Hall subassembly is connected in especially.

Background technology

Because advancing by leaps and bounds of high-tech technology especially maked rapid progress in the field of microelectronics correlation technique processing procedure especially in recent years, so the electronic correlation product has penetrated with in each family and all trades and professions, becomes some indispensable in the modern life.Certainly because human wants is more and more, make electronic installation must reach the use of greater functionality relatively, cause electronic product to stride forward towards the target of diversification effect.And above-mentioned electronic product must be detected to the load of voltage and electric current in its circuit or for defeated under the considering of safety, to guarantee this electronic product the injury or the destruction of the mankind or peripherals is reduced to minimum.

And it is the simplest and to use the widest method be to be voltage and current resistor sensor method at measuring DC voltage and DC current.See also shown in Figure 1ly, be shunt voltage sample circuit synoptic diagram commonly used.Shunt voltage sample circuit 1 commonly used utilizes the bleeder circuit principle again with acquisition voltage sampling point a, b in the load circuit 11, obtains a certain proportion of magnitude of voltage.And variable resistor V _RResistance value is bigger, the non-loaded effect that heals, and in addition operational amplifier (OPA) 12 is connected into voltage follower again, can improve input impedance, makes to measure output voltage V _OutThe rough sampling voltage V that equals _AboAs shown in Figure 2, be the input impedance voltage sample circuit synoptic diagram that improves commonly used.Voltage sample circuit 2 commonly used will improve input sampling circuit V _InInput impedance, and amplification is arranged, make the measurement output voltage V _OutThe rough sampling voltage V that equals _In

See also shown in Fig. 3 figure, be series connection pressure drop sample circuit synoptic diagram commonly used.Commonly used series connection pressure drop sample circuit 3 is sampling with the electric current, utilizes the resistance drop method, gets a certain proportion of magnitude of voltage, R _xThe resistance resistance value is littler, the non-loaded effect that heals, and operational amplifier 32 is connected into high gain voltage and amplifies, and can improve sensed quantity.Utilize high resistance sampling sensing voltage in parallel, if can add the multiplier resistor dividing potential drop in case of necessity, utilize series connection low resistance sampling current sensor, if can add the shunt resistance shunting in case of necessity, via Ohm law, dividing potential drop or branch flow relation obtain voltage or current value again, be transformed into other suitable electronic signal in case of necessity again, transmit or handle (control) circuit.

But above-mentioned several sample circuit streets have identical disappearance, promptly can't be isolated with load circuit, load effect and line loss can be produced, and amplifying circuit will be added in case of necessity, therefore how to go to solve this problem, be that the dealer is urgently in scheme of seeking to solve and improvements always.

The utility model content

The technical matters that the utility model mainly solves is: at above-mentioned the deficiencies in the prior art, provide a kind of current sensing means, utilize the operating characteristic of Hall subassembly, reaching increases the effect of measuring current value sensitivity.

In order to solve the problems of the technologies described above, the technical scheme that the utility model adopted is: a kind of current sensing means, and it comprises a circuit substrate, a side of this circuit substrate is provided with predetermined circuit layout; Also comprise:

One iron core is arranged with at least one main coil on it, these main coil two ends are connected with described circuit substrate respectively, and this iron core is positioned on the another side of described circuit substrate, and the axial direction of described iron core circuit substrate is perpendicular therewith haply;

One coil support body, it is connected with an end of described iron core, is arranged with most the secondary coils that axial direction parallels with the axial direction of described iron core haply on it; And

One Hall subassembly, it connects on the described circuit layout, and is positioned on the axial direction of this axial direction unshakable in one's determination and this secondary coil.

So, this current sensing means sees through the operating characteristic (magnetic flux density with flow through electric current be directly proportional) of Hall subassembly, and measures current value, reaches the effect that increases the sensitivity of measurement current value; Reach low pressure drop resistance and can measure the effect of current value really; Provide and the corresponding majority of a main coil secondary coil, utilize and adjust secondary coil quantity, reach the effect that enlarges reference current control; Utilization needn't directly contact with metering circuit, can reach to prevent that current sensing means from producing overheated effect because of pressure drop.

For ease of to other characteristics of current sensing means of the present utility model and structure more deep understanding being arranged, mat one embodiment is specified in the back now:

Description of drawings

Fig. 1 is shunt voltage sample circuit synoptic diagram commonly used.

Fig. 2 is the input impedance voltage sample circuit synoptic diagram that improves commonly used.

Fig. 3 is series connection pressure drop sample circuit synoptic diagram commonly used.

Fig. 4 is Hall subassembly structure commonly used and start circuit diagram.

Fig. 5 is the utility model current sensing means preferred embodiment perspective view.

Fig. 6 is another visual angle perspective view of the utility model current sensing means preferred embodiment.

Fig. 7 is the utility model current sensing means preferred embodiment side-looking structural representation.

Embodiment

See also shown in Figure 4ly, be Hall subassembly structure commonly used and start circuit diagram.Described Hall subassembly 4 has an inductor 41, and this inductor 41 extends the flake structure that construction goes out for being directions X and Y direction.When applying a start voltage V _InThe time, can carry out this inductor 41 of start inducing the magnetic flux density (along the Z direction) that flows through electric current, and reflect an output voltage V with this inductor 41 _OutBecause magnetic flux density is with to flow through electric current proportional, when measuring current value, this Hall subassembly 4 needn't be followed circuit contacts (serial connection).

See also Fig. 5 figure to shown in Figure 7, be the utility model current sensing means preferred embodiment spatial structure and side-looking structural representation.Current sensing means 5 of the present utility model, it includes: a circuit substrate 51, an iron core 52, a coil support body 53 and a Hall subassembly 54.Described circuit substrate 51 has one first side 511 and one second side 512 that is parallel to each other, and 511 printings are provided with a predetermined circuit layout 513 on this first side, and the transmission conducting of electric current is provided.

Described unshakable in one's determination 52 its be a right cylinder, be arranged with at least one main coil 55 on it, this main coil 55 is that copper and alloy thereof are made, and these main coil 55 2 ends are connected with described circuit substrate 51 respectively, and make described unshakable in one's determination 52 to be positioned on second side 512 of this circuit substrate 51, and the axial direction 91 of this iron core 52 is perpendicular with described circuit substrate 51 substantially.This coil support body 53 is connected with an end of described unshakable in one's determination 52, and is positioned on described unshakable in one's determination 52 contiguous these first sides on 511 the end.Described coil support body 53 is arranged with most the secondary coils 56 that axial direction parallels with described unshakable in one's determination 52 axial direction 91 haply on it, and this secondary coil 56 is that copper and alloy thereof are made.Described Hall subassembly 54 is to connect on this circuit layout 513, and is positioned on the axial direction 92 of described unshakable in one's determination 52 axial direction 91 and this secondary coil 56.

When direct supply I passes through this main coil 55, because described unshakable in one's determination 52 have high permeability, therefore more make this direct supply I compile and form corresponding one first magnetic flux density B1 along described unshakable in one's determination 52 axial direction 91 (promptly perpendicular to described circuit substrate 51 directions), after receiving this main coil 55 formed first magnetic flux density B1 with described Hall subassembly 54 again, can calculate the current value of this direct supply I.Again by the axial direction 92 formation corresponding one second magnetic flux density B2 of another electric current I 1 along this secondary coil 56, and the second magnetic flux density B2 be with the first magnetic flux density B1 be reverse direction, therefore can utilize the size of adjusting by another electric current I 1, reach the size that enlarges the Control current scope.

Learning current sensing means of the present utility model thus, is the disappearance that overcomes common technology really, satisfies the demand of industrial community and improves industrial competitiveness.The all dark well-off progressive of executing has the value on the industry, and is new creation not seen before on the market at present on the purpose of this utility model and the effect, meets the important document of patent novelty and progressive fully, files an application in accordance with the law.

Claims

1. current sensing means, it comprises a circuit substrate, a side of this circuit substrate is provided with predetermined circuit layout; It is characterized in that: also comprise:

2. as claim the 1 described current sensing means, it is levied and is: it is combined in described coil support body on the end of described contiguous this side unshakable in one's determination.

3. current sensing means as claimed in claim 1 is characterized in that: when described main coil passes through an electric current, can form one first magnetic flux density along this axial direction unshakable in one's determination.

4. current sensing means as claimed in claim 1 is characterized in that: when most secondary coils pass through an electric current, can form one second magnetic flux density along the axial direction of this secondary coil.

5. current sensing means as claimed in claim 1 is characterized in that: described iron core has high permeability.

6. current sensing means as claimed in claim 1 is characterized in that: described main coil is made by copper and alloy thereof.