JP4272044B2 - Fuse device with built-in current sensor - Google Patents

Description

  The present invention relates to a fuse device with a built-in current sensor.

In recent years, in vehicles such as automobiles, an increase in power consumption and precise control of electric loads are increasing due to an increase in in-vehicle electrical components and digitization of various devices. In order to realize the function of the on-vehicle electrical component and the control function of various devices, a current sensor that senses the current of the circuit has become an essential configuration. Thus, Patent Document 1 has been proposed as a device provided with a current sensor. In the configuration of Patent Document 1, a battery connection terminal provided in the fusible link block is passed through a current sensor provided separately from the fusible link block and then connected to the battery connection terminal. It is configured to be worn. The fusible link block has a configuration in which fuses are concentrated and arranged in parallel with the battery terminals, and the power of the battery power source is distributed to the electrical components through the fuses. And the current sensor of patent document 1 outputs a detection signal to the control part of various electrical components, and can perform various control based on the detection signal.
JP 2002-280083 A, “FIGS. 1 and 2”, “FIGS. 12 and 13”

  However, conventionally, a member through which current flows, such as a battery connection terminal, that is, a member for detecting current, and a current sensor provided in a separate body, an assembly in which both are assembled to a battery, etc. When attaching, when something comes into contact with one member from the outside, there is a problem that an assembling error between them occurs. Also, since the current sensor and the current detection member are separate, it is necessary to design on the premise of a separate configuration, and there are significant design restrictions, and separate configurations are required. This increases costs. In addition, there is a problem that the detection accuracy is deteriorated when there is an assembly error as described above.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a fuse device with a built-in current sensor that solves the above-described problems and solves the problem of assembly error, increases design freedom, and reduces costs.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the first connection terminal and the second connection terminal are provided in a common housing, and the first connection terminal and the second connection terminal are provided in the housing. A current passage portion is formed between the pair of parallel portions so that flowing currents are directed in directions opposite to each other, and a fuse element that connects the parallel portions is formed in the current passage portion . A current sensor for detecting a current flowing through the pair of parallel portions is provided so as to be sandwiched between the pair of parallel portions, and the fuse element is not affected by the heat of the arc when the fuse element is blown. distance are spaced, to the gist of the current sensor incorporated fuse device, characterized in that the electrodes for outputting a detection signal of the current sensor unit to the outside is provided in the housing It is intended.

According to a second aspect of the present invention, in the first aspect , the first connection terminal and the second connection terminal are each formed of one electrode piece and are arranged in the same direction. To do.

According to the first aspect of the present invention, the current sensor portion that detects the current flowing through the current passage portion and the current passage portion is covered by the common housing and is not exposed to the outside. For this reason, when the fuse device with a built-in current sensor is installed where it should be used, the current passage portion and the current sensor portion are not touched from the outside, and an assembly error between the current passage portion and the current sensor portion occurs. There is no. For this reason, detection accuracy does not fall. In addition, the current sensor portion that detects the current flowing through the current passage portion and the current passage portion is located in a common housing. For this reason, as a fuse device with a current sensor, compared to the case where the current sensor part and the member through which the current detected by the current sensor part flows are separated, a design is made in which both are assembled outside the housing. No need for design freedom. Moreover, since it is not a separate structure, the cost can be reduced accordingly.
In addition, the current sensor part is provided so as to be sandwiched between a pair of parallel parts, and the fuse element is spaced apart from the fuse element by a predetermined distance so as not to be affected by the heat of the arc when the fuse element is blown. There is no hindrance to the current detection of the current sensor when fusing.

According to a second aspect of the present invention, in the fuse device with a built-in current sensor, the first connection terminal and the second connection terminal are each formed by one electrode piece and arranged in the same direction. The effect of can be produced.

(Implementation form)
Hereinafter, the present invention will be described with reference to FIG. 1 one embodiment which embodies. 1A is a sectional view of a fuse device with a built-in current sensor (hereinafter referred to as a fuse device), FIG. 1B is a plan view, FIG. 1C is a front view, and FIG. 1D is a side view. is there. For convenience of explanation, with reference to FIG. 1A, the left direction is referred to as left, the right direction as right, the up direction as up, and the down direction as down.

  The fuse device F of the present embodiment outputs a detection signal detected by a current sensor 30 described later to an external control device (not shown). Then, the control device performs various controls according to the detected current value.

  As shown in FIG. 1A, the housing 10 of the fuse device F is formed in a square box shape in plan view from a heat-resistant / insulating synthetic resin or the like. The upper part of the housing 10 is an opening and is closed with a lid 40. At the bottom of the housing 10, covered cylindrical portions 10 a and 10 b are formed at the left and right lower portions. In the cylindrical portions 10a and 10b at the bottom, a pair of conductive terminals 11 and 12 spaced apart from each other pass through the bottom, extend downward from the housing 10, and protrude from the covered cylindrical portions 10a and 10b. Has been. Elastic locking pieces 11a, 12a formed by cutting from the conductive terminals 11, 12 are elastically locked to the inner surfaces of the cylindrical portions 10a, 10b. Due to the locking pieces 11 a and 11 b, the conductive terminals 11 and 12 do not rattle with respect to the housing 10. Further, in the conductive terminals 11 and 12, both side portions of the portion protruding from the housing 10 are bent inward. Furthermore, in the conductive terminals 11 and 12, a through hole 12b is formed in the center on the tip side. FIG. 1D shows only the through hole 12b on the conductive terminal 12 side.

The conductive terminal 11 corresponds to the first connection terminal of the present invention, and the conductive terminal 12 corresponds to the second connection terminal. The conductive terminals 11 and 12 are each composed of one electrode piece.
The base ends of the conductive terminals 11 and 12 are connected to each other by a connecting portion 13. The connecting portion 13 corresponds to a current passage portion. The connecting part 13 is a pair of parallel parts 13a arranged substantially parallel to extend in the vertical direction, a fusing part 13b arranged so as to be substantially orthogonal to the parallel part 13a and connecting the two parts, and a parallel part 13a. It is comprised from the connection part 13c which connects the base end of the conductive terminal 11. FIG. The distance between the parallel portions 13 a is set to be smaller than the distance between the conductive terminals 11 and 12. The fusing part 13b has a smaller cross-sectional area than the parallel part 13a, the connection part 13c, and the conductive terminals 11 and 12, and is fused with a current carrying capacity greater than or equal to a predetermined value. The fusing part 13b corresponds to a fuse element. A storage space S is formed between the pair of parallel portions 13a. Further, a pair of protruding ridges 20, 21 projecting from the inner surface of the housing 10 so as to extend in the vertical direction, and the parallel portions 13a are sandwiched between the protruding ridges 20, 21. .

  In the storage space S formed between the parallel portions 13a, a current sensor 30 as a current sensor portion is disposed so as to be coaxial with a center line L extending in the vertical direction of the housing 10. Further, the current sensor 30 and the fusing part 13b are arranged so as to be separated from each other by a predetermined distance. This distance is set so that the fusing part 13b is not affected by the heat of the arc at the time of fusing. By being separated in this way, current detection of the current sensor 30 is prevented from being hindered when fusing.

  The current sensor 30 is composed of a Hall element as a magnetoelectric conversion element. The current sensors 30 are arranged so as to be close to each parallel portion 13a and have an equal distance (preferably 1 mm or less), and currents flowing through the parallel portions 13a flow in opposite directions to each other. ing. This eliminates the need to form a magnetic path for collecting magnetic flux. The current flowing through the parallel portion 13a generates a magnetic field around the parallel portion 13a, and the magnetic flux density, which is the strength of the magnetic field, is proportional to the magnitude of the current. The current sensor 30 detects the magnitude of the current by detecting the magnetic flux density.

  The current sensor 30 is connected to lead terminals 31 and 32 for current sensor control and a lead terminal 33 for detection signal output. The lead terminals 31 to 33 pass through one side wall of the housing 10 and protrude to the outside, and extend downward through the bent portions 31a, 32a, and 33a. The lead terminal 33 corresponds to an electrode. Further, the parallel portion 13a corresponds to a detection area.

The operation and effect of this embodiment are as follows.
(1) In the fuse device F configured as described above, the current sensor 30 is disposed between the pair of parallel portions 13a which are members for detecting current, and is further disposed along the parallel portions 13a. The currents flowing through the parallel portions 13a flow in opposite directions. This eliminates the need to form a magnetic path for collecting magnetic flux.

  (2) Further, the arrangement positions of the current sensors 30 with respect to the parallel portions 13a are set to the same distance. Thus, the distance to each parallel portion 13a is the same, and as shown in FIG. 1A, it is close (1 mm or less) so as to be symmetrical with respect to the center line L extending in the vertical direction. Since it is arranged, it can be expected that the detected magnetic flux density is substantially constant.

  (3) Furthermore, since the current sensor 30 and the parallel portion 13a as a member for detecting current are disposed in the common housing 10, something from the outside may come into contact with only one member. And the positional relationship between the two does not shift. Further, the detection accuracy does not drop due to the assembly.

( Reference example)
Next, a reference example will be described with reference to FIGS. 2A is a perspective view seen from the front side of the fuse device F, and FIG. 2B is a partially cutaway perspective view. FIG. 3 is a perspective view of the conductive member 200, and FIG. 4 is an explanatory view showing a mounting state of the current sensor 300.

The fuse device F includes a housing 100, a conductive member 200, and a current sensor 300 as a current sensor unit. The housing 100 is molded, and a part of the conductive member 200 and the current sensor 300 are inserted. As shown in FIG. 3, the conductive member 200 is formed of a conductive plate made of a single piece of copper. The conductive member 200 includes a battery connection terminal 210, a connecting plate part 220, a plurality of fusing parts 230, and a plurality of branch terminals 240. The battery connection terminal 210 is formed in a reverse channel shape in cross section, and is bent into an L shape as shown in FIG. The battery connection terminal 210 has a through hole 212 formed therein. The battery connection terminal 210 is detachably attached to the positive terminal by tightening a nut to the positive terminal in a state where a battery pole-shaped positive terminal (not shown) is inserted through the through hole 212. As shown in FIG. 2A, the battery connection terminal 210 protrudes from the upper part of one side surface of the housing 100 to the outside.

The connecting plate portion 220 is formed in a flat plate shape, and the L-shaped end portion of the battery connection terminal 210 is integrally connected to the upper center. The plurality of fusing parts 230 are spaced apart at substantially equal intervals across the width direction of the lower part of the connecting plate part 220 and are integrally connected to the connecting plate part 220. A branch terminal 240 as an electrode piece is integrally connected to the lower part of each fusing part 230. Each fusing part 230 has a smaller cross-sectional area than the branch terminal 240 and the connecting plate part 220 connected to each other, and is fused with a predetermined current-carrying capacity or more. The fusing part 230 corresponds to a fuse element. In addition, each fusing part is formed so that the interruption energization capacities differ and the shapes thereof are different. The branch terminals 240 are arranged in parallel so as to face the same direction. In this reference example , each branch terminal 240 projects downward from the lower portion of the housing 100. In the housing 100, a window 120 is formed in a portion corresponding to each fusing part 230, and the fusing part 230 is exposed to the outside.

  As shown in FIG. 2B, a current sensor 300 is embedded in the upper part of the housing 100. The current sensor 300 includes a ring core 310 and a hall element 320 (magnetoelectric conversion element). The ring core 310 is configured by a C-shaped ring disposed so as to surround the periphery of the battery connection terminal 210 (see FIGS. 2B and 4). As shown in FIG. 4, the Hall element 320 is disposed between the opposite ends of the ring core 310. A magnetic path is formed in the ring core 310 by the current flowing through the battery connection terminal 210. By disposing the Hall element 320 between opposite ends of the ring core 310 that is a part of the magnetic path, the Hall element 320 is arranged. The current flowing through the battery connection terminal 210 is detected.

  The hall element 320 includes lead terminals 330 and 340 for current sensor control and a lead terminal 350 for outputting a detection signal, and each of these terminals is in a connector opening 130 provided on one side of the housing 100. In FIG.

  The lead terminal 350 corresponds to an electrode. The battery connection terminal 210 corresponds to a first connection terminal, and each branch terminal 240 corresponds to a second connection terminal. In battery connection terminal 210, the part surrounded by ring core 310 corresponds to a current path portion.

In this reference example, in the fuse device F including a plurality of branch terminals 240, the battery connection terminal 210 is surrounded by the ring core 310 (current path portion) and the current sensor 300 in a common housing 100. As a result, it is possible to prevent the assembly error from occurring.

In addition, you may change embodiment of this invention as follows .

○ In the above embodiment, the conductive terminals 11 and 12, although the male type terminal, may be female terminals.

(A) is a cross-sectional view of the current sensor Fuse device Kazumi facilities embodying the present invention, (b) is plan view of the same, (c) is a front view, (d) is a side view. (A) is a perspective view of the fuse apparatus with a built- in current sensor of a reference example , (b) is a partially cutaway perspective view. The perspective view of the electrically-conductive member 200 similarly. Explanatory drawing which similarly shows the attachment state of the current sensor 300. FIG.

Explanation of symbols

F ... Fuse device 10 ... Housing 11 ... Conductive terminal (first connection terminal)
12 ... Conductive terminal (second connection terminal)
13 ... Connection part (current passage part)
13a ... Parallel part (detected area)
13b ... fusing part (fuse element)
30 ... Current sensor (current sensor, magnetoelectric transducer)
33 ... Lead terminal (electrode piece)

Claims (2)

The first connection terminal and the second connection terminal are provided in a common housing;
A current passage portion is formed between the first connection terminal and the second connection terminal in the housing,
In the current passage portion, a pair of parallel portions are formed so that flowing currents are directed in opposite directions, and a fuse element is formed to connect the parallel portions .
The pair of current sensor unit for detecting a current flowing in the parallel portion is provided so as to sandwich between the pair of parallel portions Rutotomoni, with respect to the fuse element, not influenced by the heat of the arc during the fuse elements blown A fuse device with a built-in current sensor, wherein the housing is provided with an electrode for outputting a detection signal of the current sensor unit to the outside, which is spaced apart by a predetermined distance .   2. The fuse device with a built-in current sensor according to claim 1, wherein each of the first connection terminal and the second connection terminal is formed of one electrode piece and is arranged in the same direction. .

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