Electrical Equipment

Abstract

To provide a technique capable of reducing leakage magnetic flux in electrical equipment without increasing the size of the electrical equipment.SOLUTION: Electrical equipment includes a first relay including a first electromagnet, and a second relay including a second electromagnet. The first relay and the second relay are arranged such that the N pole of the first electromagnet faces the S pole of the second electromagnet, and the S pole of the first electromagnet faces the N pole of the second electromagnet.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to an electrical device including a relay. [Background technology]

[0002] Patent Document 1 discloses a method for reducing leakage flux in an electrical device. The electrical device includes a transformer that causes leakage flux. A flux reduction coil is attached to the upper surface of the transformer. A current is passed through the flux reduction coil so as to generate a magnetic flux in the opposite direction to the leakage flux generated by the transformer. The leakage flux is cancelled out by the magnetic flux generated from the flux reduction coil. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-283346 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the technology described in Patent Document 1, it is necessary to additionally install a dedicated coil solely for canceling leakage magnetic flux, which leads to an increase in the size of the electrical device.

[0005] An object of the present disclosure is to provide a technique capable of reducing leakage magnetic flux in an electric device without increasing the size of the electric device. [Means for solving the problem]

[0006] One aspect of the present disclosure relates to an electrical device. The electric device includes a first relay including a first electromagnet and a second relay including a second electromagnet. The first relay and the second relay are arranged such that the north pole of the first electromagnet faces the south pole of the second electromagnet and the south pole of the first electromagnet faces the north pole of the second electromagnet. Effect of the Invention

[0007] According to the present disclosure, the north pole of the first electromagnet faces the south pole of the second electromagnet, and the south pole of the first electromagnet faces the north pole of the second electromagnet. Therefore, the magnetic flux density is high in the region between the first electromagnet and the second electromagnet. Conversely, the magnetic flux density is low outside the region including the first electromagnet and the second electromagnet. This means that the leakage magnetic flux from the relay is effectively reduced.

[0008] Furthermore, according to the present disclosure, there is no need to add a dedicated component just for reducing leakage magnetic flux. By simply devising the arrangement of the first relay and the second relay, it is possible to reduce leakage magnetic flux without adding a dedicated component. Since there is no need to add a dedicated component, an increase in the size of the electrical device is prevented. In other words, it is possible to reduce the size and weight of the electrical device. [Brief description of the drawings]

[0009] [Figure 1] 1 is a block diagram illustrating a schematic configuration example of an electrical device according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a circuit diagram illustrating a configuration example of a relay according to an embodiment of the present disclosure. [Diagram 3] 1 is a conceptual diagram illustrating an arrangement of electromagnets of a pair of relays according to an embodiment of the present disclosure. FIG. [Figure 4] FIG. 13 is a conceptual diagram for explaining a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0011] 1 is a block diagram showing a schematic configuration example of an electric device 1 according to the present embodiment. The electric device 1 includes at least a pair of relays 10. The pair of relays 10 includes a first relay 10-1 and a second relay 10-2. The first relay 10-1 and the second relay 10-2 may be of the same type.

[0012] The electric device 1 also includes a control device 20 that controls ON / OFF of each of the first relay 10-1 and the second relay 10-2. More specifically, the control device 20 is configured to supply current to each coil of the first relay 10-1 and the second relay 10-2. By turning the current supply ON / OFF, each of the first relay 10-1 and the second relay 10-2 can be turned ON / OFF. The control device 20 may simultaneously turn ON / OFF the first relay 10-1 and the second relay 10-2.

[0013] The first relay 10-1 is connected to an electric circuit 30-1. When the first relay 10-1 is turned ON / OFF, the electric circuit 30-1 is also turned ON / OFF. The second relay 10-2 is connected to an electric circuit 30-2. When the second relay 10-2 is turned ON / OFF, the electric circuit 30-2 is also turned ON / OFF.

[0014] FIG. 2 is a circuit diagram showing an example of the configuration of each relay 10. The relay 10 includes an electromagnet 11 and a switch (contact) 15. The electromagnet 11 includes a coil 12 and an iron core. The coil 12 is connected to the control device 20 via a terminal 13. The switch 15 includes a movable contact 15a and a fixed contact 15b. The switch 15 is connected to an electric circuit 30 via a terminal 16. A current is supplied to the coil 12 from the control device 20. When a current is supplied to the coil 12, the electromagnet 11 generates a magnetic field, the movable contact 15a comes into contact with the fixed contact 15b, and the switch 15 is turned ON. That is, the relay 10 is turned ON. When the current supply to the coil 12 is stopped, the magnetic field generated by the electromagnet 11 disappears, the movable contact 15a moves away from the fixed contact 15b, and the switch 15 is turned OFF. That is, the relay 10 is turned OFF.

[0015] In this way, the electromagnet 11 of the relay 10 generates a magnetic field (magnetic flux). In particular, unlike a permanent magnet, leakage magnetic flux from the relay 10 (electromagnet 11) that is turned ON / OFF fluctuates. The leakage magnetic flux from the relay 10 may affect other components in the electric device 1. For example, in the example shown in FIG. 1, the electric device 1 includes a sensor 40 (e.g., a current sensor) that detects a physical quantity based on magnetic flux. The leakage magnetic flux from the relay 10 may affect the detection accuracy of the sensor 40. Therefore, it is desirable to reduce the leakage magnetic flux in the electric device 1.

[0016] Electric device 1 according to this embodiment is characterized in the arrangement of electromagnets 11 of a pair of relays 10 in order to reduce leakage magnetic flux.

[0017] 3 is a conceptual diagram for explaining the arrangement of the electromagnets 11 of a pair of relays 10 according to this embodiment. The first relay 10-1 includes a first electromagnet 11-1, and the second relay 10-2 includes a second electromagnet 11-2. The first electromagnet 11-1 and the second electromagnet 11-2 are arranged to be close to and face each other.

[0018] In particular, Fig. 3 shows a state in which both the first relay 10-1 and the second relay 10-2 are ON. When a current is supplied to the coil 12 of the first electromagnet 11-1, a magnetic pole is generated in the first electromagnet 11-1, and a magnetic field is generated from the first electromagnet 11-1. Similarly, when a current is supplied to the coil 12 of the second electromagnet 11-2, a magnetic pole is generated in the second electromagnet 11-2, and a magnetic field is generated from the second electromagnet 11-2. As shown in Fig. 3, the first relay 10-1 and the second relay 10-2 are arranged such that, when energized, the N pole of the first electromagnet 11-1 faces the S pole of the second electromagnet 11-2, and the S pole of the first electromagnet 11-1 faces the N pole of the second electromagnet 11-2. In other words, current is supplied from the control device 20 to the coils 12 of the pair of relays 10 so that the N pole of the first electromagnet 11-1 faces the S pole of the second electromagnet 11-2 and so that the S pole of the first electromagnet 11-1 faces the N pole of the second electromagnet 11-2.

[0019] Since the N pole of the first electromagnet 11-1 faces the S pole of the second electromagnet 11-2, and the S pole of the first electromagnet 11-1 faces the N pole of the second electromagnet 11-2, the magnetic flux density is high in the region between the first electromagnet 11-1 and the second electromagnet 11-2. Conversely, the magnetic flux density is low outside the region including the first electromagnet 11-1 and the second electromagnet 11-2. This means that the leakage magnetic flux from the pair of relays 10 is effectively reduced.

[0020] Here, it should be noted that according to the present embodiment, unlike the case of the above-mentioned Patent Document 1, there is no need to add a dedicated part just for reducing leakage magnetic flux. The first relay 10-1 and the second relay 10-2 are both normal parts, and are not dedicated parts just for reducing leakage magnetic flux. By simply devising the arrangement of the first relay 10-1 and the second relay 10-2, it is possible to reduce leakage magnetic flux without adding a dedicated part. Since there is no need to add a dedicated part for reducing leakage magnetic flux, an increase in the size of the electric device 1 is prevented. In other words, it is possible to reduce the size and weight of the electric device 1.

[0021] Furthermore, since the leakage magnetic flux from the pair of relays 10 is reduced, restrictions on the placement of the sensor 40 (e.g., a current sensor) are also relaxed. To explain this, first, a comparative example shown in FIG. 4 will be described. In the comparative example, the relay placement as in this embodiment is not adopted, and the influence of the leakage magnetic flux from the relay 10 (electromagnet 11) is significant. In order to ensure the detection accuracy of the sensor 40, it is necessary to place the sensor 40 far away from the relay 10. In other words, the separation distance between the relay 10 and the sensor 40 must be set large. This also leads to an increase in the size of the electric device 1.

[0022] On the other hand, according to the present embodiment, leakage magnetic flux from the pair of relays 10 is reduced. Therefore, even if the sensor 40 is arranged closer to the relay 10 as shown in Fig. 3, the detection accuracy of the sensor 40 does not decrease. In other words, it is possible to shorten the separation distance between the sensor 40 and the relay 10 while ensuring the detection accuracy of the sensor 40. This also contributes to the miniaturization of the electric device 1.

[0023] As described above, according to the present embodiment, it is possible to reduce leakage magnetic flux in the electric device 1 without increasing the size of the electric device 1. [Explanation of symbols]

[0024] 1. Electrical Equipment 10 Relay 10-1 First Relay 10-2 Second Relay 11 Electromagnet 11-1 First electromagnet 11-2 Second electromagnet 12 Coils 15 Switch 20 Control device 30 Electrical Circuits 40 Sensors

Claims

[Claim 1] a first relay including a first electromagnet; a second relay including a second electromagnet; a control device that controls ON / OFF of each of the first relay and the second relay; Equipped with the control device changes the first relay from an OFF state to an ON state by supplying a current to the first electromagnet, and changes the second relay from an OFF state to an ON state by supplying a current to the second electromagnet, The first relay and the second relay are arranged such that, when the first relay and the second relay are in the ON state, the N pole of the first electromagnet faces the S pole of the second electromagnet, and the S pole of the first electromagnet faces the N pole of the second electromagnet. Electrical equipment.

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