EMC filter and charging system

Abstract

This EMC filter inhibits a common-mode noise generated in a power line. The EMC filter is to be coupled between a charging inlet of a vehicle and a charging cable connected to a charging station, and is capable of being attached to and detached from a conversion adapter which connects a power line of the charging inlet and a power line of the charging cable.

Description

EMC filters and charging systems

[0001] The present disclosure relates to an EMC filter and a charging system.

[0002] When charging an electric vehicle such as an electric car, a charging station installed at the destination may be used. If the charging station has a different standard from the standard that the electric vehicle complies with, a conversion adapter is used (see, for example, Patent Documents 1, 2, and 3).

[0003] JP 2017-229230 A JP 2017-79542 A International Publication No. 2012 / 111081

[0004] The EMC filter according to the present disclosure is an EMC filter that suppresses common-mode noise generated in power lines, is connected between a charging inlet of a vehicle and a charging cable connected to a charging station, and is detachable from a conversion adapter that connects the power line of the charging inlet to the power line of the charging cable.

[0005] Fig. 1 is a schematic perspective view showing the appearance of a conversion adapter included in a charging system according to a first embodiment of the present disclosure. Fig. 2 is a schematic diagram of the charging system according to the first embodiment of the present disclosure. Fig. 3 is a schematic diagram showing a connection state of electrical power lines and the like during charging by the charging system. Fig. 4 is a schematic diagram showing an EMC filter according to the first embodiment. Fig. 5 is a schematic diagram showing a state in which the EMC filter is attached to a second charging connector. Fig. 6 is a schematic diagram showing a state in which the EMC filter according to a second embodiment is attached to a charging inlet of a vehicle.

[0006] [Problem to be Solved by the Present Disclosure] An electric vehicle is provided with an EMC filter that suppresses common-mode noise generated when the vehicle is connected to a charging station and charging is performed. As described above, when the charging methods differ between the vehicle and the charging station, a conversion adapter is used to convert the interface. Typically, EMC filters are designed for electric vehicles assuming that they will be connected to charging stations of the same charging method. However, when an electric vehicle is connected to a charging station of a different charging method via a conversion adapter, the impedance component as seen from the charging inlet of the electric vehicle toward the charging station changes compared to when a conversion adapter is not used, which has led to a problem that common-mode noise may not be sufficiently suppressed.

[0007] Here, it is conceivable to attach an EMC filter to the conversion adapter to suppress common mode noise, but the common mode noise generated varies depending on the vehicle model, standard, battery capacity, etc. This means that the conversion adapter cannot be reused when the vehicle model, etc. is changed. This results in the need to stock a large number of conversion adapters equipped with EMC filters according to the vehicle model, etc., which does not improve convenience. There is a demand for improving convenience when charging using a conversion adapter.

[0008] Therefore, one of the objects is to provide an EMC filter that can improve convenience when charging using a conversion adapter.

[0009] Effect of the Present Disclosure The EMC filter described above can improve convenience when charging using a conversion adapter.

[0010] [Description of Embodiments of the Present Disclosure] First, embodiments of the present disclosure will be listed and described. The EMC filter according to the present disclosure is: (1) an EMC filter that suppresses common-mode noise generated in a power line, which is connected between a charging inlet of a vehicle and a charging cable connected to a charging station, and is detachable from a conversion adapter that connects the power line of the charging inlet and the power line of the charging cable.

[0011] A conversion adapter equipped with such an EMC filter can suppress common-mode noise generated in the power line, even when connected, for example, between a vehicle's charging inlet and a charging cable connected to a charging station. This can suppress false detection and malfunction of the thermistor even when charging using the conversion adapter. In this case, because the EMC filter is detachable, the attached EMC filter can be easily changed depending on the common-mode noise that changes with changes in vehicle model, etc. Therefore, such an EMC filter can improve convenience when charging using the conversion adapter.

[0012] (2) In the above (1), the EMC filter may include a first connector and a second connector connected to the power lines of the conversion adapter, a first power line connected to the first connector and the second connector, a second power line connected to the first connector and the second connector, and a third power line connected to the first connector and the second connector. The third power line may be connected to a ground line. In this way, earthing can be achieved by the third power line connected to the ground line, allowing for safer charging.

[0013] (3) In the above (2), the first power line may be connected to the positive power line. The second power line may be connected to the negative power line. This configuration reliably suppresses common-mode noise occurring between the positive and negative power lines, thereby preventing erroneous detection by the thermistor. This allows for more reliable charging.

[0014] (4) In any one of (1) to (3) above, the conversion adapter may include a housing. The EMC filter may be disposed within the housing. By doing so, the EMC filter is disposed within the housing, and therefore the EMC filter can be protected by the housing. Therefore, stable use over a longer period of time can be ensured.

[0015] (5) In the above (2) or (3), the EMC filter may include a common choke coil arranged to surround a portion of the first power line and a portion of the second power line, a first capacitor connected to the first power line and the third power line, and a second capacitor connected to the second power line and the third power line. This allows for safer charging using the capacitors and the common choke coil.

[0016] (6) A charging system according to the present disclosure includes a vehicle, a charging stand, a conversion adapter connected between the vehicle and the charging stand and connecting a power line of the vehicle to a power line of the charging stand, and an EMC filter that is attachable to and detachable from at least one of the conversion adapter and the vehicle and that suppresses common-mode noise generated in the power line.

[0017] According to this charging system, common-mode noise can be suppressed by the EMC filter even when a conversion adapter is used. In this case, the EMC filter is detachably attached to at least one of the conversion adapter and the vehicle, so the EMC filter to be attached can be easily changed depending on the common-mode noise generated. This improves convenience when charging using the conversion adapter.

[0018] [Details of the embodiment of the present disclosure] Next, an embodiment of the EMC filter and charging system of the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference numerals, and the description thereof will not be repeated.

[0019] (Embodiment 1) The configuration of an EMC filter and a charging system according to embodiment 1 of the present disclosure will be described. Fig. 1 is a schematic perspective view showing the appearance of a conversion adapter equipped with an EMC filter according to embodiment 1 of the present disclosure. Fig. 2 is a schematic diagram of a charging system including the conversion adapter shown in Fig. 1. Fig. 3 is a schematic diagram showing the connection status of electrical power lines and the like during charging by the charging system. Fig. 4 is a schematic diagram showing an EMC filter according to embodiment 1.

[0020] 1 , 2 , 3 , and 4 , a charging system 10a including a conversion adapter 11a equipped with an EMC filter 59a according to the first embodiment is a charging system that charges an electric vehicle, in this embodiment, an electric vehicle 12a. In the present disclosure, charging is DC (direct current) charging. The charging system 10a includes the conversion adapter 11a, a charging stand 14a to which a charging cable 13a is connected, and an EMC filter 59a attached to the conversion adapter 11a. The charging cable 13a is connected to the charging stand 14a that supports a second charging method different from a first charging method, which will be described later. A charging connector 15a for the charging cable, which has a handle, is provided at the end of the charging cable. When the charging method on the charging stand 14a side differs from the charging method on the electric vehicle 12a side, the conversion adapter 11a converts the charging method so that one of the charging methods matches the other charging method.

[0021] Charging cable 13a includes a plurality of electric lines, such as a positive power line 21a, a negative power line 22a, a ground line 23a, a first communication line 24a, a second communication line 25a, a first signal line 26a, a second signal line 27a, a third signal line 28a, and a fourth signal line 29a.

[0022] The electric vehicle 12a includes a vehicle charging inlet 16a compatible with the first charging method, which serves as a charging interface. The charging system 10a includes the charging inlet 16a of the electric vehicle 12a. The charging inlet 16a is provided with a charging socket 17a for vehicle charging, which is an insertion port for the charging connector 15a. The charging connector 15a is connected to this charging socket 17a to charge the electric vehicle 12a.

[0023] Charging inlet 16a is provided with multiple electrical lines corresponding to charging cable 13a. Charging inlet 16a includes electrical lines such as a positive power line 31a, a negative power line 32a, a ground line 33a, a first communication line 34a, a second communication line 35a, a first signal line 36a, and a second signal line 37a. Charging inlet 16a also includes a voltmeter 38a and a switch 39a provided on second signal line 37a.

[0024] The charging inlet 16a on the electric vehicle 12a side is equipped with thermistors 18a and 18b that detect temperature during charging, and an EMC filter 19a (second EMC filter) that suppresses common-mode noise generated in the power line when the charging socket 17a and charging connector 15a are connected during charging. If the thermistors 18a and 18b detect that the temperature is higher than a predetermined temperature, the charging state is determined to be abnormal, and charging is stopped. The element values ​​of the EMC filter 19a are designed to sufficiently suppress common-mode noise when the electric vehicle 12a is connected to a charging station that uses the same charging method as the charging method used by the electric vehicle 12a.

[0025] If the charging cable 13a and the charging inlet 16a comply with the same standard, charging can be performed by directly connecting the charging connector 15a to the charging socket 17a. However, if the charging stand 14a, the charging cable 13a, the charging connector 15a, and the charging socket 17a comply with different standards, charging cannot be performed by directly connecting the charging connector 15a to the charging socket 17a. In this case, the conversion adapter 11a is used.

[0026] The conversion adapter 11a includes a housing 20a, specifically, a first charging connector 51a compatible with a first charging method, a second charging connector 52a compatible with a second charging method, and a conversion cable 53a. In other words, in this embodiment, the housing 20a included in the conversion adapter 11a includes the first charging connector 51a, the second charging connector 52a, and the conversion cable 53a. The first charging connector 51a and the second charging connector 52a are connected by the conversion cable 53a. The conversion cable 53a includes multiple electric wires, such as a positive power wire. The first charging connector 51a can be connected to the charging connector 15a. The opening 54a and the arrangement of the power wires exposed in the opening 54a comply with the same standards as those of the charging stand 14a, the charging cable 13a, and the charging connector 15a. The second charging connector 52a can be connected to the charging socket 17a. That is, the shape and arrangement of the protrusions 55a that are inserted into the charging socket 17a conform to the same standards as those of the charging socket 17a.

[0027] Conversion cable 53a has multiple electric lines corresponding to charging cable 13a. Conversion cable 53a includes electric lines such as positive power line 41a, negative power line 42a, ground line 43a for earthing, first communication line 44a, second communication line 45a, first signal line 46a, second signal line 47a, third signal line 48a, and fourth signal line 49a. Conversion cable 53a also includes a resistor 56a arranged between ground line 43a and first signal line 46a, a resistor 57a arranged in second signal line 47a, and a resistor 58a arranged between second signal line 47a and fourth signal line 49a.

[0028] In addition, by using a conversion adapter 11b of a standard compatible with electric vehicle 12b that complies with a different standard from electric vehicle 12a, and a conversion adapter 11c of a standard compatible with electric vehicle 12c that complies with yet another standard, it is possible to charge electric vehicle 12b and electric vehicle 12c from charging stand 14a.

[0029] The conversion adapter 11a is equipped with an EMC filter 59a (first EMC filter) that suppresses common mode noise generated in the power lines, specifically, the positive power line 41a and the negative power line 42a. In this embodiment, the EMC filter 59a is detachably attached to the housing 20a. Specifically, the EMC filter 59a is provided in the second charging connector 52a. Similarly, the conversion adapters 11b and 11c are equipped with EMC filters 59b (first EMC filter) and 59c (first EMC filter).

[0030] The EMC filter 59a includes a first connector 61a, a second connector 62a, a common choke coil 63a, a first capacitor 64a, a second capacitor 65a, a first power line 71a, a second power line 72a, and a third power line 73a. The first power line 71a is connected to the first connector 61a and the second connector 62a. The second power line 72a is connected to the first connector 61a and the second connector 62a. The third power line 73a is connected to the first connector 61a and the second connector 62a. The first power line 71a, the second power line 72a, and the third power line 73a are respectively disposed between the first connector 61a and the second connector 62a. That is, the first connector 61a and the second connector 62a are provided at both ends of the first power line 71a, the second power line 72a, and the third power line 73a. The first connector 61a and the second connector 62a are connection terminals of the EMC filter 59a, and are attached to the second charging connector 52a using the first connector 61a and the second connector 62a.

[0031] The common choke coil 63a is disposed so as to surround a portion of the first power line 71a and the second power line 72a. The first capacitor 64a is connected to the first power line 71a and the third power line 73a. The second capacitor 65a is connected to the second power line 72a and the third power line 73a.

[0032] Fig. 5 is a schematic diagram showing the state in which EMC filter 59a is attached to second charging connector 52a. Also referring to Fig. 5, when EMC filter 59a is attached to second charging connector 52a, first connector 61a and second connector 62a are connected to first internal connector 66a and second internal connector 67a, respectively, provided on second charging connector 52a. This connects first power line 71a to positive power line 41a, second power line 72a to negative power line 42a, and third power line 73a to ground line 43a.

[0033] Charging is performed using the conversion adapter 11a equipped with this EMC filter 59a. Specifically, the first charging connector 51a of the conversion adapter 11a is connected to the charging connector 15a of the charging cable 13a, and the second charging connector 52a of the conversion adapter 11a is connected to the charging socket 17a of the charging inlet 16a. Charging is performed in this state.

[0034] When the conversion adapter 11a equipped with this EMC filter 59a is connected between the charging inlet 16a of the electric vehicle 12a and the charging cable 13a connected to the charging stand 14a, the EMC filter 59a can suppress common-mode noise generated in the power line. This can suppress false detection and malfunction of the thermistors 18a and 18b even during charging using the conversion adapter 11a. In this case, because the EMC filter 59a is detachable, the attached EMC filter 59a can be easily changed depending on the common-mode noise that changes with changes in vehicle model, etc. Therefore, this EMC filter 59a improves convenience during charging using the conversion adapter 11a.

[0035] Furthermore, with the charging system 10a, even when the conversion adapter 11a is used, the EMC filter 59a can suppress common-mode noise. In this case, because the EMC filter 59a is detachable from the conversion adapter 11a, the EMC filter 59a to be attached can be easily changed depending on the common-mode noise generated. This improves convenience when charging using the conversion adapter 11a.

[0036] In this embodiment, the EMC filter 59a includes a first connector 61a and a second connector 62a connected to the power lines of the conversion adapter 11a, a first power line 71a connected to the first connector 61a and the second connector 62a, a second power line 72a connected to the first connector 61a and the second connector 62a, and a third power line 73a connected to the first connector 61a and the second connector 62a. The third power line 73a is connected to a ground line. Therefore, earthing can be achieved by the third power line 73a connected to the ground line, allowing for safer charging.

[0037] In this embodiment, the first power line 71a is connected to the positive power line 41a. The second power line 72a is connected to the negative power line 42a. This reliably suppresses common-mode noise generated in the positive power line 41a and the negative power line 42a, preventing erroneous detection by the thermistors 18a and 18b. This allows for more reliable charging.

[0038] In this embodiment, the conversion adaptor 11a includes a housing 20a. The EMC filter 59a is disposed within the housing 20a. Therefore, since the EMC filter 59a is disposed within the housing 20a, the EMC filter 59a can be protected by the housing 20a. This ensures stable use over a longer period of time.

[0039] In this embodiment, the EMC filter 59a includes a common choke coil 63a arranged to surround a portion of the first power line 71a and a portion of the second power line 72a, a first capacitor 64a connected to the first power line 71a and the third power line 73a, and a second capacitor 65a connected to the second power line 72a and the third power line 73a. Therefore, charging can be performed more safely using the capacitors and the common choke coil.

[0040] In the above embodiment, the EMC filter is arranged inside the housing, but the present invention is not limited to this, and the EMC filter may be arranged outside the housing.

[0041] (Embodiment 2) Another embodiment, embodiment 2, will now be described. Fig. 6 is a schematic diagram showing an EMC filter according to embodiment 2 attached to a vehicle charging inlet. The EMC filter according to embodiment 2 basically has the same configuration as embodiment 1 and achieves the same effects. However, the EMC filter according to embodiment 2 differs from embodiment 1 in that it is detachably attached to the vehicle inlet.

[0042] 6 , EMC filter 59d (second EMC filter) according to the second embodiment is detachably provided to charging inlet 16a of electric vehicle 12a. EMC filter 59d includes a first connector 61d, a second connector 62d, a common choke coil 63d, a first capacitor 64d, a second capacitor 65d, a first power line 71d, a second power line 72d, and a third power line 73d. The first connector 61 d, the second connector 62 d, the common choke coil 63 d, the first capacitor 64 d, the second capacitor 65 d, the first power line 71 d, the second power line 72 d, and the third power line 73 d are configured similarly to the first connector 61 a, the second connector 62 a, the common choke coil 63 a, the first capacitor 64 a, the second capacitor 65 a, the first power line 71 a, the second power line 72 a, and the third power line 73 a, respectively, and therefore description thereof will be omitted. The first connector 61 d and the second connector 62 d are connection terminals of the EMC filter 59 d, and the EMC filter 59 d is attached to the charging inlet 16 a of the electric vehicle 12 a using the first connector 61 d and the second connector 62 d.

[0043] When EMC filter 59d is attached to charging inlet 16a, first connector 61d and second connector 62d are connected to first internal connector 66d and second internal connector 67d, respectively, which are provided on charging inlet 16a, thereby connecting first power line 71d to positive power line 31a, second power line 72d to negative power line 32a, and third power line 73d to ground line 43a.

[0044] Charging is performed using charging inlet 16a equipped with this EMC filter 59d. Specifically, first charging connector 51a of conversion adapter 11a is connected to charging connector 15a of charging cable 13a, and second charging connector 52a of conversion adapter 11a is connected to charging socket 17a of charging inlet 16a. Charging is performed in this state.

[0045] According to the charging system 10d including the EMC filter 59d, common-mode noise can be suppressed by the EMC filter 59d even when the conversion adapter 11a is used. In this case, because the EMC filter 59d is detachably attached to the charging inlet 16a of the electric vehicle 12a, the EMC filter 59d to be attached can be easily changed depending on the common-mode noise generated. This improves convenience when charging using the conversion adapter 11a.

[0046] That is, in combination with the first embodiment, the EMC filter is provided so as to be detachable from at least one of the conversion adapter and the vehicle charging inlet, thereby enabling more efficient charging.

[0047] It should be understood that the embodiments disclosed herein are illustrative in all respects and are not limiting in any respect. The scope of the present disclosure is defined not by the above description but by the scope of the claims, and it is intended to include all modifications within the meaning and scope of the claims.

[0048] 10a, 10d Charging system 11a, 11b, 11c Conversion adapter 12a, 12b, 12c Electric vehicle 13a Charging cable 14a Charging stand 15a Charging connector 16a Charging inlet 17a Charging socket 18a, 18b Thermistor 19a, 59d EMC filter (second EMC filter) 59a, 59b, 59c EMC filter (first EMC filter) 20a Housing 21a, 31a, 41a Positive power line 22a, 32a, 42a Negative power line 23a, 33a, 43a Ground line 24a, 34a, 44a First communication line 25a, 35a, 45a Second communication line 26a, 36a, 46a First signal line 27a, 37a, 47a Second signal line 28a, 48a Third signal line 29a, 49a Fourth signal line 38a Voltmeter 39a Switch 51a First charging connector 52a Second charging connector 53a Conversion cable 54a Opening 55a Protrusion 56a, 57a, 58a Resistor 61a, 61d First connector 62a, 62d Second connector 63a, 63d Common choke coil 64a, 64d First capacitor 65a, 65d Second capacitor 66a, 66d First internal connector 67a, 67d Second internal connector 71a, 71d First power line 72a, 72d Second power line 73a, 73d Third power line

Claims

1. An EMC filter that suppresses common mode noise generated in power lines, said EMC filter being connected between a charging inlet of a vehicle and a charging cable connected to a charging station, and being detachable from a conversion adapter that connects the power line of the charging inlet and the power line of the charging cable.

2. The EMC filter as described in claim 1, comprising: a first connector and a second connector connected to a power line of the conversion adaptor; a first power line connected to the first connector and the second connector; a second power line connected to the first connector and the second connector; and a third power line connected to the first connector and the second connector, wherein the third power line is connected to a ground line.

3. The EMC filter according to claim 2, wherein the first power line is connected to a positive power line, and the second power line is connected to a negative power line.

4. An EMC filter according to claim 1 or 2, wherein the conversion adapter includes a housing, and the EMC filter is disposed within the housing.

5. The EMC filter according to claim 2, comprising: a common choke coil arranged to surround a portion of the first power line and a portion of the second power line; a first capacitor connected to the first power line and the third power line; and a second capacitor connected to the second power line and the third power line.

6. A charging system comprising: a vehicle; a charging stand; a conversion adapter connected between the vehicle and the charging stand for connecting a power line of the vehicle to a power line of the charging stand; and an EMC filter attachable to and detachable from at least one of the conversion adapter and the vehicle for suppressing common mode noise generated in the power line.