Current sensor and attachment structure of the same
A technology of current sensor and magnetic sensor, applied in the direction of measuring current/voltage, instrument, measuring electrical variables, etc., can solve the problem of low detection accuracy
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no. 1 example ）
[0036] will be referred to below Figures 1 to 5 A first embodiment of the present disclosure is described.
[0037] For example, the current sensor according to the first embodiment is used to detect a current (hereinafter also referred to as detection current) flowing in a bus bar connected to an on-vehicle battery or the like.
[0038] refer to figure 1 and 2 , the current sensor 1 includes a substrate 10 , a magnetic sensor 20 , a bias magnet 30 , a circuit chip 40 , leads 50 and a molding resin 60 . The substrate 10 has a first surface 10a and a second surface 10b opposite to the first surface 10a. The magnetic sensor 20 , the bias magnet 30 and the circuit chip 40 are disposed on the first surface 10 a of the substrate 10 . The magnetic sensor 20 has a substantially rectangular outline and includes a magnetoresistive element. The bias magnet 30 has a substantially rectangular outline and applies a bias magnetic field Bb to the magnetic sensor 20 . The circuit chip ...
no. 2 example ）
[0075] Hereinafter, a second embodiment of the present disclosure will be described.
[0076] In the current sensor 1 according to the second embodiment, the shape of the bias magnet 30 is different from that of the first embodiment. The other structure of the current sensor 1 of the second embodiment will be the same as that of the first embodiment, and its structure will not be repeated. Figure 6 is a diagram showing a schematic diagram of the current sensor 1 according to the second embodiment.
[0077] Such as Figure 6As shown, the bias magnet 30 has a first portion 130a and a second portion 130b. The first portion 130 a extends in a predetermined direction, for example, parallel to the direction of the detection current flowing in the bus bar 70 . The second portion 130b vertically extends from the opposite end of the first portion 130a. In other words, the bias magnet 30 is substantially U-shaped. The magnetic sensor 20 is disposed in a space defined by the bias m...
no. 3 example ）
[0080] Hereinafter, a third embodiment of the present disclosure will be described.
[0081] The current sensor 1 according to the third embodiment has a magnetic field generating element different from that of the first embodiment. Other structures of the third embodiment will be the same as those of the first embodiment, and description thereof will not be repeated. Figure 7 is a diagram showing a schematic diagram of the current sensor 1 according to the third embodiment.
[0082] Such as Figure 7 As shown in , a current sensor 1 has an iron core coil 31 on a substrate 10 instead of a bias magnet 30 . The core coil 31 is sealed with a molding resin 60 . The core coil 31 includes a core 31a and a winding wound around the core 31a. The iron core 31a includes a first portion 31b extending in one direction, and a second portion 31c vertically extending from the opposite end of the first portion 31b. The iron core 31a is substantially U-shaped. A winding is wound around ...
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