JPH0687881U - Current sensor - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a Hall element type current sensor that does not require winding work and can avoid variations in detection accuracy due to variations in the number of windings. (Structure) One part (2a) of the winding is arranged in a housing (5) having an open end face for housing this current sensor, while the other part (2b) of the winding is It is arranged on the cover plate (7) for closing the open end face of (5), and by closing the open end face of the housing (4) with the cover plate (7), one part (2a) of the winding and the other part (2a) 2b) is connected to form a winding wound around the magnetic core (1). Hall element (3) in the air gap of the magnetic core (1)
Are placed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a current sensor used for detecting various currents flowing in an electric vehicle, and more particularly to a Hall element type current sensor that does not require complicated winding work.

[0002]

[Prior art]

 Hall element type current sensors are used to detect various currents flowing in electric vehicles. This Hall element type current sensor generates a magnetic field in the magnetic core, which has a magnitude corresponding to the current value of the target to be detected, by winding the winding through which the current to be detected flows around the core. The magnitude of the generated magnetic field is detected by the output voltage of the Hall element installed in the air gap formed in the magnetic core.

[0003]

[Problems to be solved by the device]

 In the Hall element type current sensor, since the winding is manually wound, the winding work requires labor and time, and the detection accuracy may vary due to the variation in the number of windings. Instead of winding the winding around a magnetic core, a conductive pattern is previously formed on the printed wiring board, and the conductive patterns are connected by metal fittings that also hold the magnetic core. It is disclosed in Japanese Utility Model Publication No. 4-5017. However, in this prior art, the problem of labor and time required for soldering metal fittings is still unsolved.

Therefore, an object of the present invention is to provide a Hall element type current sensor that can eliminate the winding work and can avoid the variation in the detection accuracy due to the variation in the number of windings. Another object of the present invention is to realize a Hall element type current sensor which is small in size and whose winding is not exposed to the outside.

[0005]

[Means for Solving the Problems]

 The Hall element type current sensor of the present invention has a lid in which one part of the winding is arranged in a housing having an open end face for accommodating the current sensor and the other part closes the open end face of the housing. It is arranged on a plate, and by closing the open end surface of the housing with a cover plate, one part of the winding is connected to the other part to form a winding for winding the magnetic core. .

[0006]

[Action]

 Since the winding around which the magnetic core is wound is formed by closing the open end surface of the housing with the cover plate, it is not necessary to manually wind the winding. Further, since one part and the other part of the winding are prefabricated on the housing side and the cover plate side, respectively, variations in detection sensitivity due to variations in the number of windings do not occur.

[0007]

【Example】

 FIG. 1 is an exploded perspective view showing the structure of a Hall element type current sensor according to an embodiment of the present invention, in which 1 is a magnetic core having an air gap, 2a is one part of a winding, and 2b is the other part of the winding. , 3 is a Hall element, 4 is a printed wiring board on which an electronic circuit is mounted, 5 is a housing, 6 is a frame, 7 is a cover plate, and 8 and 9 are input terminals and output terminals of a current to be detected. . The casing 5 and the cover plate 7 are made of an insulating material such as resin.

One part 2 a of the winding has a plurality of substantially U-shaped conductor pieces 11, 12, 13 which are planted at equal intervals in a casing 5 having an open end face for accommodating the current sensor. ..It is composed of 1n. Further, the other part of the winding is connected to the conductor pieces 21, 22, 23 ... 2n fixed to the bottom surface of the lid plate 7 which detachably covers the open end surface of the housing 5 and the conductor pieces. And the connectors 31 and 32 to be connected. The conductor pieces 21 to 2n are formed by an appropriate technique such as screen printing.

When assembling this current sensor, first, the magnetic core 1 is housed in the housing 5 while being positioned by the frame 6. The hole element 3 fixed on the printed wiring board 4 is prepositioned so as to be arranged in the space of the magnetic core 1 housed in the housing 5. An electronic circuit for detecting the output voltage from the Hall element 3 is formed on the printed wiring board 4, but the illustration thereof is omitted. Next, the open end surface of the housing 5 is covered with the lid plate 7 and fixed to the housing 5 by an appropriate coupling mechanism (not shown) such as a screw. Along with this, the upper end portions of the substantially U-shaped conductor pieces 11, 12, 13 ... 1n forming one portion of the winding are inserted into the openings formed in the bottom portions of the connectors 31 and 32. .

Each opening of the connector 31 is connected to an adjacent opening that is offset by one from the corresponding opening of the connector 32 via the conductor pieces 21, 22, 23 ... 2n. As a result, the upper end portion of the conductor piece 11 is connected to the upper end portion on the far end side of the adjacent conductor piece 12 through the opening of the connector 31, the conductor piece 21, and the adjacent opening of the connector 32. The upper end portion on the near end side of the adjacent conductor piece 12 is connected to the upper end portion on the far end side of the adjacent conductor piece 13 through the opening of the connector 31, the conductor piece 22, and the adjacent opening of the connector 32. It In this manner, the upper ends of the adjacent conductor pieces 11, 12, 13, ... 1n on the far end side are connected to each other by the conductor pieces 21, 22, 23, ... 2n. As a result, only by covering the open end surface of the housing 5 with the cover plate 7, a winding having a desired number of turns around the magnetic core 1 is formed.

The configuration in which the one winding 2a and the other winding 2b are connected via the connectors 31 and 32 has been illustrated above. However, the windings 2a and 2b may be directly connected by a method such as press contact without interposing such a connector. Further, the connector 31 and the conductor pieces 21 to 2n can be formed integrally with the cover plate 7.

[0012]

[Effect of device]

 As described in detail above, the current sensor of the present invention has a structure in which the winding is formed at the same time when the open end surface of the housing is closed by the cover plate, so that the winding work by hand is not necessary. . Further, since one part and the other part of the winding are prefabricated on the housing side and the lid plate side, respectively, there is an advantage that the detection sensitivity does not vary with the number of windings. .

Further, since the current sensor of the present invention has a structure in which the winding is housed in the housing 5 which is closed by the cover plate 7, it is small in size, and there is no fear of short-circuiting of the winding, and safety is ensured. The effect of being able to do is also exhibited.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a current sensor according to an embodiment of the present invention.

[Explanation of symbols]

1 Magnetic core 2a One part of the winding 2b The other part of the winding 3 Hall element 4 Printed wiring board on which an electronic circuit that detects the output voltage of the hall element is formed 5 Case 7 Cover 11 to 1n Substantially U-shaped conductor piece 21 to 2n forming one part 2a of the winding 21 to 2n Conductor piece forming the other part 2b of the winding 31,32 Connector

Claims (3)

[Scope of utility model registration request] 1. A magnetic core having an air gap, a winding wound around the magnetic core, a Hall element arranged in the air gap of the magnetic core, and an electronic circuit for forming an output voltage of the Hall element. In the Hall element type current sensor configured by, one part of the winding is arranged in a housing having an open end face for housing the current sensor, and the other part of the winding is It is arranged on a cover plate for closing the open end surface of the housing, and by closing the open end surface of the housing with the cover plate, one part of the winding is connected to the other part of the winding to form the winding. A current sensor characterized by being formed. 2. The part of the winding according to claim 1, wherein one part of the winding is made up of a plurality of substantially U-shaped conductor pieces planted in the housing at substantially equal intervals, and the other part of the winding is formed. Is a conductor sensor that connects the far ends of adjacent ones of the conductor sides forming the one portion. 3. The connector according to claim 2, wherein each end of the conductor piece forming the other portion of the winding is formed with a connector for coupling with a tip end portion of the conductor piece forming the one portion. A current sensor characterized in that