WO2013134928A1

WO2013134928A1 - Coil assembly component of a detector

Info

Publication number: WO2013134928A1
Application number: PCT/CN2012/072275
Authority: WO
Inventors: Wei Qiu; Leiming Xu; Haibao LIU
Original assignee: Siemens Aktiengesellschaft
Priority date: 2012-03-13
Filing date: 2012-03-13
Publication date: 2013-09-19
Also published as: CN104204859A; CN104204859B

Abstract

A coil assembly component (100) comprises: a first couple of a first transmitting coil (10) and a first receiving coil (20) disposed on the front side of the base plate (110); a second couple of a second transmitting coil (30) and a second receiving coil (40) disposed on the backside of the base plate (110); a series of first sets of contacts (120) disposed along half of the periphery of the base plate (110) corresponding to the first and second transmitting coils (10, 30), wherein each set of the first sets is configured to be connected to each end of the first and second transmitting coils (10, 30) respectively; and a series of second sets of the contacts (130) disposed along the other half of the periphery of the base plate (110) corresponding to the first and second receiving coils (20, 40), wherein each set of the second sets is configured to be connected to the first and second receiving coils (20, 40) respectively.

Description

COIL ASSEMBLY COMPONENT OF A DETECTOR

Field of the Invention

The present invention relates to the coils in a detector, more particular, relates to a coil assembly component.

Background of the Invention

In a detector, such as a metal detector used in a vehicle detection system, four coils are used, including Ti, T₂, Ri, and R₂, as shown in Fig. 1. Ti and T₂ are transmitting coils, while Ri and R₂ are receiving coils. Ti and Ri are grouped into a first couple, while T₂ and R₂ are grouped into a second couple. As shown in Fig. 1, one end of Ti and T₂ may be connected to power supply, and the other end may be connected to a corresponding circuit (not shown in Fig. 1). Similarly, one end of Ri and R₂ may be connected to ground, and the other end may be connected to the corresponding circuit. In practical, Ti and Ri may be deposed on the same layer of a PCB (Printed Circuit Board), while T₂ and R₂ may be deposed on another layer.

The total current of Ti and T₂ is constant, i.e., I_TI+I_T2=IC, where In is the current on Ti, I_T2 is the current on T₂ and Ic is the sum of the In and Ιχ₂. Each of Ti and T₂ can generate alternating magnetic field respectively, both of which are opposite in phase. When Ti and T₂ works, induced voltage will be generated on Ri and R₂.

Accordingly, a balance may be found for the system by only regulating the current on Ti and T₂, when the angle between the first and second couple is appropriate.

Fig. 2 is a graph showing the relationship among I_T1, I_T2, U_RI, and U_R2, wherein U_RI is the induced voltage on Ri, U_R2 is the induced voltage on R₂. As described above, the sum of In and Ιχ₂ is constant. In this regard, U_RI may be changed with I_T1, and also U_RI may be change with I_Ti since Ιχ₂ may be changed with I_T1. As shown in Fig. 2, U_RI is equal to U_R2 at the point the balance point.

When a metal object, for example a vehicle, comes into the detecting rang of the detector, the magnetic fields generated by In and Ιχ₂ will be changed and thus the balance will be broken. A new balance may be established at another point which may be indicated by another value of In. As shown in Fig. 3, U_RI is not equal to U_R2 at the formal balance point ¾. However, at the point ¾₂, U_RI is equal to U_R2 again, that is a new balance is established.

However, if an angle error exists between the first couple of coils (TiRi) and the second couple of coils (T₂R₂), the curves may be changed as shown in Fig. 4. In this case, the curves of In and Ιχ₂ will not intersect with each other, and thus there will not be a balance point at which U_RI is equal to U_R2.

Accordingly, existed coil assembly is configured to allow the PCB layer comprising Tl and Rl can be rotated with respect to the another PCB layer comprising T2 and R2. In this manner, the angle between T1R1 and T2R2 may be regulated. When the angle error exists, the two PCB layers may be rotated to a proper position and thus the balance point will be present again.

Summary of the Invention

The object of the present invention is providing a coil assembly component that could be easily regulated the angle between the two couples of coils.

In one aspect of the present invention, a coil assembly component is provided, comprising: a first couple of a first transmitting coil and a first receiving coil disposed on the front side of the base plate; a second couple of a second transmitting coil and a second receiving coil disposed on the backside of the base plate; a series of first sets of contacts disposed along half of the periphery of the base plate corresponding to the first and second transmitting coils, wherein each of the first set is configured to be connected to each end of the first and second transmitting coils respectively; and a series of second set of the contacts disposed along the other half of the periphery of the base plate corresponding to the first and second receiving coils, wherein each of the second set is configured to be connected to the first and second receiving coils respectively.

Brief Description of the Drawings

Fig. 1 is the schematic drawing showing the structure of a coil assembly of a detector.

Fig. 2 is a graphic showing the relationship among I_T1, I_T2, U_RI, and U_R2. Fig. 3 is a graphic showing a new balance point.

Fig. 4 is a graphic showing an angel error existing between the first couple of coils and the second couple of coils.

Fig. 5 is a schematic drawing showing the front surface of the coil assembly component of the present invention.

Fig. 6 shows the back surface of the coil assembly of Fig. 5.

Detailed Description of the Invention

The present invention will be described in detail in terms of preferred embodiments of the invention. Many details are provided in description in order to facilitate thoroughly understanding. However, one skilled in the art can understand that the present invention can also be implemented without some or all of the details.

As shown in Figs. 5 and 6, a coil assembly component 100 of the present invention comprises a base plate 110, a first couple of a first transmitting coil Tl 10 and a first receiving coil Rl 20 disposed on the front side of the base plate 110, and a second couple of second transmitting coil T2 30 and second receiving coil R2 40 disposed on the backside of the base plate 110.

Further, a series of first sets 120 of contacts are disposed along half of the periphery of the base plate 110 corresponding to Tl and T2 in the relationship spaced apart, and are connected to the first transmitting coil Tl 10 and the second transmitting coil T2 30. As shown in Figs. 5 and 6, Each set 120 of contacts includes four contact points, in which the first contact 122 point may be connected to one end of Tl 10, the second contact point 124 may be connected to one end of T2 30, and the third contact point 126 may be connected to the other end of Tl 10, the fourth contact point 128 may be connected to the other end of T2 30. In turn, the first and second contact points 122, 124 may be connected to a corresponding circuit, and the third and fourth contact points 126, 128 may be connected to a power supply (VCC).

A series of second sets of contacts 130 are disposed along the other half of the periphery of the base plate 110 corresponding to Rl and R2 in the relationship spaced apart, and are connected to the first receiving coil Rl 20 and the second receiving coil R2 40. Each set of the contacts includes four contact points, in which the first contact point 132 may be connected to one end of Rl 20, the second contact point 134 may be connected to one end of R2 40, and the third contact point 136 may be connected to the other end of Rl 20, the fourth contact point 138 may be connected to the other end of R2 40. In turn, the first and second contact point 132, 134 may be connected to corresponding circuit, and the third and fourth contact point 136, 138 may be connected to ground (GND).

As shown in Figs. 5 and 6, the first sets and second sets of contact point may be marked as 0-K to facilitate recognize. The contact point may be otherwise connected to the coils, as long as one end of the transmitting coil is connected to the corresponding circuit and the other end of the transmitting coil is connected to VCC, while one end of the receiving coil is connected to the corresponding circuit and the other end of the receiving coil is grounded.

When it is needed to adjust the angle between T1R1 and T2R2, one of the first sets of contacts 120 may be selected, such as the set 0, and corresponding second set of contacts 130 may be determined, that is, corresponding set 0. The set 0 of the first sets of contacts 120 may be connected to Tl 10, and the set 0 of the second set of the contacts 130 may be connected to Rl 20. In order to adjust the angle between T1R1 and T2R2, it is possible to connect different set of the first sets of contacts to T2 other than the set 0, and connect different set of the second sets of contacts to R2 other than the set 0. For example, connecting the set 8 of the first sets to T2, correspondingly connecting to the set 0 of the second sets to R2. Accordingly, there is angle between the connecting lines (as indicated with 200 and 300 in Fig. 5) of sets 0 of the first and second sets and the sets 8 of the first and second sets, which is also the angle between TlRl and T2R2. By means of connecting TlRl and T2R2 to different set of contacts, the angle there between could be adjusted. In this manner, the angle between TlRl and T2R2 can be adjusted more easily and more accurately.

The base plate may be a plate used in PCB, although it can be any other suitable plate. The material used to manufacture the base plate can be chosen depending on particular application, and one skilled in the art will understand how to choose suitable material.

The connection between the contacts and the coils described above is preferable, although other connection is possible depending on particular application.

In one embodiment of the invention, the component 100 may comprises four layers. The first transmitting coil Tl may be disposed in the first and second layers. Tl is formed as spiral. As described above, one end of the Tl is connected to the first contact point 122 of the first sets of contacts 120. Tl may be extended inward, and may go through the first layer to the second layer at the point 400, and then may be extended outward to the second contact point 124 of the first sets of the contacts 120. In the same way, the first receiving coil Rl may be disposed in the first and second layers. Similarly, the second transmitting coil T2 and the second receiving coil R2 may be disposed in the third and fourth layers of the component.

Although the invention is described in terms of its several embodiments, there are many other replacement, permutation, modification and equivalent. Therefore, it should be interpreted that the all of such replacement, permutation, modification and equivalent fall into the scope of the invention as defined in the claim.

Claims

Claims What is claimed is:

1. A coil assembly component (100), comprising a base plate (110), wherein the component comprises:

a first couple of a first transmitting coil (10) and a first receiving coil (20) disposed on the front side of the base plate (110);

a second couple of a second transmitting coil (30) and a second receiving coil (40) disposed on the backside of the base plate (110);

a series of first sets of contacts (120) disposed along half of the periphery of the base plate (110) corresponding to the first and second transmitting coils (10, 30), wherein each of the first set is configured to be connected to each end of the first and second transmitting coils (10, 30) respectively; and

a series of second set of the contacts (130) disposed along the other half of the periphery of the base plate (110) corresponding to the first and second receiving coils (20, 40), wherein each of the second set is configured to be connected to the first and second receiving coils (20, 40) respectively.

2. The coil assembly component of claim 1, wherein each of the first sets of contacts (120) comprises:

a first contact point (122) connected to one end of the first transmitting coil (10); a second contact point (124) connected to one end of the second transmitting coil

(30);

a third contact point (126) connected to the other end of the first transmitting coil (10); and

a fourth contact point (128) connected to the other end of the secons transmitting coild (30).

3. The coil assembly component of claim 2, wherein the first and second contact points (122, 124) can be connected to a corresponding circuit, and the third and fourth contact points (126, 128) can be connected to a power supply.

4. The coil assembly componnet of claim 1, wherein each of the second sets of contacts (130) comprises:

a first contact point (132) connected to one end of the first receiving coil (20); a second contact point (134), connected to one end of the second receiving coil

(40);

a third contact point (136), connected to the other end of the first receiving coil (20); and

a fourth contact point (138), connected to the other end of the second receiving coil (40).

5. The coil assembly component of claim 4, wherein the first and second contact points (132, 134) can be connected to a corresponding circuit, and the third and fourth contact points (136, 138) can be grounded.