JP2017093141A - Non-contact power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power transmission device capable of reducing the conduction emission, conducted to an AC system power supply.SOLUTION: A power transmission device 100 includes a power cable 102, a power conversion unit 118, a power transmission unit 124, a metal enclosure 130, and a filter 108. The filter 108 is provided in an AC power line 104, and configured to suppress common mode noise. The filter 108 is provided in the AC power line 104, so that the length D1 of the AC power line 104 between a connection 107, where the AC power line 104 is connected with an AC system power supply 300, and the filter 108 becomes shorter than the length D2 of the AC power line 104B between the filter 108 and power conversion unit 118.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a contactless power transmission device, and more particularly to a contactless power transmission device that receives supply of AC power from an AC system power supply and transmits power to a power receiving device in a contactless manner.

  2. Description of the Related Art A power transmission system that transmits power from a power transmission device to a power reception device in a contactless manner by magnetically coupling a power transmission unit of the power transmission device to the power reception unit of the power reception device is known (see, for example, Patent Documents 1 to 6). .

  Regarding a power transmission device used in such a power transmission system, for example, Japanese Patent Laying-Open No. 2014-207794 (Patent Document 1) suppresses a frequency component of a predetermined frequency or more between an inverter and a power transmission coil (power transmission unit). A non-contact power feeding device (power transmission device) in which an LC filter is disposed is disclosed. By providing such an LC filter, magnetic field emission radiated from the power transmission coil can be reduced (see Patent Document 1).

JP 2014-207794 A JP2013-154815A JP2013-146154A JP2013-146148A JP 2013-110822 A JP 2013-126327 A

  In the power transmission device as described above, in addition to reducing the magnetic field radiation radiated from the power transmission coil, the conduction emission conducted to the AC system power supply (common mode noise having a higher frequency than the AC power supplied from the AC system power supply) is also provided. It is necessary to reduce it sufficiently.

  In a power transmission device, stray capacitance exists between a metal casing that houses a power conversion unit such as an inverter and a power transmission unit, and the ground, or between an AC power line and a ground line of a power cable. When the resonance path including the ground is formed by the stray capacitance and the inductance of the AC power line, common mode noise can be amplified in the resonance path. In particular, when the power transmission device is used in a large power transmission system such as power transmission to a vehicle that can receive power in a non-contact manner, the stray capacitance and the inductance of the AC power line increase, which adversely affects the AC system power supply. Can be amplified in the resonant path. As a result, there is a possibility that the conduction emission conducted to the AC system power supply cannot be sufficiently reduced.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a non-contact power transmission device capable of reducing the conduction emission conducted to the AC power supply.

  A non-contact power transmission device according to the present invention includes a power cable, a power conversion unit, a power transmission unit, a housing, and a filter unit. The power cable includes an AC power line connected to an AC system power supply and a ground line. The power conversion unit is connected to the AC power line and configured to convert the power received from the AC power line into transmission power. The power transmission unit is configured to transmit the transmission power supplied from the power conversion unit to the power reception unit in a non-contact manner by magnetically coupling with the power reception unit of the power reception device. The casing is made of metal, houses the power conversion unit and the power transmission unit, and is connected to the ground line. The filter unit is provided on the AC power line and is configured to suppress common mode noise. In the filter unit, the length (D1) of the AC power line between the connection unit where the AC power line is connected to the AC system power supply and the filter unit is the length of the AC power line between the filter unit and the power conversion unit. It is provided on the AC power line so as to be shorter than (D2).

  In this non-contact power transmission device, grounding occurs due to stray capacitance generated between the metal housing that houses the power conversion unit and the power transmission unit and the ground, and between the AC power line and the grounding line of the power cable. A resonant path including can be formed. That is, the AC power line, the stray capacitance between the AC power line and the ground line, the metal casing, the stray capacitance between the casing and the ground, the ground, the AC system power supply, and the resonance path through the AC power line again. Can be formed. And in this non-contact power transmission device, when the filter part is provided in the AC power line, the filter part is the length (D1) of the AC power line between the connection part where the AC power line is connected to the AC system power supply and the filter part. ) Is provided on the AC power line so as to be shorter than the length (D2) of the AC power line between the filter unit and the power conversion unit. Thereby, the section of the AC power line that can form the resonance path is shortened, and the noise current flowing through the stray capacitance between the AC power line and the ground line is reduced. Therefore, according to this non-contact power transmission device, it is possible to effectively reduce the noise current that can increase due to the resonance phenomenon. As a result, the conduction emission conducted to the AC system power supply can be reduced.

  Preferably, the non-contact power transmission device further includes a circuit breaker and another housing. The circuit breaker is provided on the AC power line. Another housing houses the circuit breaker. And a filter part is accommodated in the inside of another housing | casing.

  By adopting such a configuration, it is possible to suppress an increase in the physique of the non-contact power transmission device due to the installation of the filter unit, compared to a case where the installation space for the filter unit is separately provided outside the circuit breaker housing. it can.

  According to the present invention, it is possible to provide a non-contact power transmission device that can sufficiently reduce the conduction emission conducted to the AC power supply.

1 is an overall configuration diagram of a power transmission system to which a contactless power transmission device according to a first embodiment is applied. In the power transmission apparatus shown in FIG. 1, it is a figure for demonstrating the resonance path | route of the noise which can be formed when a filter part is not provided in an alternating current power line. In the power transmission device shown in FIG. 1, it is a diagram for explaining a resonance path of noise that can be formed when a filter unit is disposed at a position close to a power conversion unit. It is the figure which showed the noise suppression effect of the power transmission apparatus according to Embodiment 1. FIG. It is the figure which showed the noise suppression effect in case the filter part demonstrated in FIG. 3 is arrange | positioned in the position near a power converter. It is a whole block diagram of the electric power transmission system with which the non-contact power transmission apparatus according to Embodiment 2 is applied. It is a whole block diagram of the electric power transmission system with which the non-contact power transmission apparatus according to Embodiment 3 is applied. It is a whole block diagram of the electric power transmission system with which the non-contact power transmission apparatus according to Embodiment 4 is applied.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

[Embodiment 1]
FIG. 1 is an overall configuration diagram of a power transmission system to which a non-contact power transmission apparatus according to Embodiment 1 of the present invention is applied. With reference to FIG. 1, the power transmission system includes a power transmission device 100 and a power reception device 200. The power receiving device 200 can be mounted on a vehicle that can travel using the electric power supplied and stored from the power transmitting device 100, for example. That is, the power transmission device 100 is not a small device that supplies power to a small device such as a portable device, but is a large device that can supply a large amount of power to the power receiving device 200 mounted on a vehicle or the like. A power of several kW can be transmitted to the power receiving apparatus 200 in a contactless manner.

  The power transmission device 100 includes a power cable 102, a filter unit 108, a power conversion unit 118, a power transmission unit 124, and a housing 130.

  The power cable 102 includes an AC power line 104 and a ground line 106. AC power line 104 supplies AC power received from AC system power supply 300 (for example, AC 200 V) to power conversion unit 118. The AC power line 104 is provided with a filter unit 108. Hereinafter, the AC power line 104 on the AC system power supply 300 side with respect to the filter unit 108 is also referred to as AC power line 104A, and on the power conversion unit 118 side with respect to the filter unit 108. The AC power line 104 is also referred to as an AC power line 104B.

  AC power line 104 </ b> A is connected to AC system power supply 300 at connection 107. For example, the connecting portion 107 is a plug for connecting the AC power line 104 (power cable 102) to the AC system power supply 300, or a cable connection terminal in a breaker box or distribution board. The other end of AC power line 104 </ b> A is connected to filter unit 108. AC power line 104 </ b> B is a portion of AC power line 104 that is disposed between filter unit 108 and power conversion unit 118.

  The ground line 106 is included in the power cable 102 together with the AC power line 104 and is connected to the housing 130. The ground line 106 may be directly connected to the ground as illustrated, or may be connected to the ground through the connection unit 107.

  The filter unit 108 is provided in the AC power line 104 and removes common mode noise superimposed on the AC power line 104. In the first embodiment, the filter unit 108 includes a common mode coil 110 wound around, for example, a ring-shaped ferrite core in opposite directions. In power transmission device 100 according to the first embodiment, filter unit 108 has a length D1 of AC power line 104A between connection unit 107 and filter unit 108 such that length D1 between filter unit 108 and power conversion unit 118 is the same. The AC power line 104 is disposed so as to be shorter than the length D2 of the AC power line 104B. This point will be described in detail later.

  Power conversion unit 118 includes a power factor correction (PFC) circuit 120 (hereinafter referred to as “PFC circuit 120”) and an inverter 122. The PFC circuit 120 rectifies AC power received from the AC power line 104 (104B) and supplies it to the inverter 122, and can improve the power factor by bringing the input current closer to a sine wave. Various known PFC circuits can be adopted as the PFC circuit 120. Instead of the PFC circuit 120, a rectifier that does not have a power factor correction function may be employed.

  The inverter 122 converts the DC power received from the PFC circuit 120 into transmission power (AC) having a predetermined transmission frequency. The predetermined power transmission frequency is a frequency determined by a standard or the like, for example, several tens of kHz. Inverter 122 is formed of, for example, a single-phase bridge circuit.

  Power transmission unit 124 includes a coil 126 and a capacitor 128. The coil 126 and the capacitor 128 form a resonance circuit. The power transmission unit 124 receives AC power having a transmission frequency from the inverter 122 and transmits the AC power to the power reception unit 202 (described later) of the power reception device 200 through a magnetic field generated around the coil 126 without contact.

  In FIG. 1, the capacitor 128 is connected to the coil 126 in series, but may be connected to the coil 126 in parallel. Although not particularly shown, a normal mode filter including an LC filter may be provided between the power conversion unit 118 and the power transmission unit 124.

  The case 130 is a metal case and houses the power conversion unit 118 and the power transmission unit 124. The housing 130 shields the electromagnetic noise from the outside of the housing so that the electromagnetic noise radiated from the power conversion unit 118 and the power transmission unit 124 is not radiated to the surroundings. A ground line 106 of the power cable 102 is connected to the housing 130. In FIG. 1, the power conversion unit 118 and the power transmission unit 124 are housed in a single housing 130, but the housing 130 includes a portion that houses the power conversion unit 118, and a portion that houses the power transmission unit 124. It may be divided into. The housing 130 is made of a nonmagnetic metal member such as aluminum, stainless steel, or copper.

  Power reception device 200 includes a power reception unit 202, a housing 204, a rectification unit 206, and a power storage unit 208. The power receiving unit 202 includes a coil and a capacitor. The coil and the capacitor form a resonance circuit. The power reception unit 202 receives the AC power output from the power transmission unit 124 of the power transmission device 100 in a non-contact manner through a magnetic field. In FIG. 1, the capacitor is connected in series to the coil, but the capacitor may be connected in parallel to the coil.

  The housing 204 is a metal housing and houses the power receiving unit 202. The case 204 shields the electromagnetic noise from the outside of the case so that the electromagnetic noise radiated from the power receiving unit 202 is not emitted to the surroundings. The housing 204 is also made of a nonmagnetic metal member such as aluminum, stainless steel, or copper.

  The rectifying unit 206 rectifies the AC power received by the power receiving unit 202 and outputs the rectified power to the power storage unit 208. Although not particularly illustrated, the rectifying unit 206 may also be housed in a separately provided housing or the housing 204. In addition, a normal mode filter including an LC filter may be provided between the power reception unit 202 and the rectification unit 206.

  Power storage unit 208 is a rechargeable DC power supply, and includes a secondary battery such as a lithium ion battery or a nickel metal hydride battery. The power storage unit 208 stores the power output from the rectification unit 206. Then, power storage unit 208 supplies the stored electric power to a load driving device (not shown) of the vehicle. Note that an electric double layer capacitor or the like may be employed as the power storage unit 208.

  In this power transmission system, power is supplied from the AC system power supply 300 to the power conversion unit 118 through the AC power line 104 of the power cable 102. The power conversion unit 118 converts the power received from the AC power line 104 into transmission power (AC) having a predetermined transmission frequency determined by a standard or the like, and supplies the transmission power to the power transmission unit 124.

  Each of power transmission unit 124 of power transmission device 100 and power reception unit 202 of power reception device 200 includes a coil and a capacitor, and is designed to resonate at a power transmission frequency. The Q value indicating the resonance intensity of the power transmission unit 124 and the power reception unit 202 is preferably 100 or more.

  In the power transmission device 100, when transmission power is supplied from the inverter 122 of the power conversion unit 118 to the power transmission unit 124, the power transmission unit 124 is transmitted through a magnetic field formed between the coil 126 of the power transmission unit 124 and the coil of the power reception unit 202. Energy (electric power) moves from to the power receiving unit 202. The energy (power) transferred to the power receiving unit 202 is supplied to the power storage unit 208 through the rectifying unit 206.

  In the power transmission device 100, stray capacitances C <b> 1 and C <b> 2 exist between the AC power line 104 and the ground line 106 of the power cable 102. Further, stray capacitance C3 also exists between the metal housing 130 that houses the power conversion unit 118 and the power transmission unit 124 and the ground 304. When a resonance path including the ground 304 is formed by the stray capacitances C1 to C3 and the inductance L of the AC power line 104, common mode noise can be amplified in the resonance path.

  The power transmission device 100 is a large device capable of supplying large power to the power receiving device 200 mounted on a vehicle or the like as described above, and the stray capacitances C1 to C3 are large. Also, considering that the power transmission device 100 is disposed in a parking space or the like, the length of the power cable 102 connected to the AC system power supply 300 may be 10 m or more, and the inductance L of the AC power line 104 is also large.

  Accordingly, if the AC power line 104 is not provided with the filter unit 108, or even if the AC power line 104 is provided with the filter unit 108, common mode noise that adversely affects the AC system power supply 300 may be generated depending on the installation position. It can be amplified in the above resonance path. Hereinafter, this point will be described.

  FIG. 2 is a diagram for explaining a resonance path of noise that can be formed when the AC power line 104 is not provided with the filter unit 108 in the power transmission device 100 illustrated in FIG. 1.

  Referring to FIG. 2, if the AC power line 104 is not provided with the filter unit 108, the stray capacitances C <b> 1 and C <b> 2 generated between the AC power line 104 and the ground line 106, and the housing 130 and the ground 304. A noise resonance path LP is formed through the stray capacitance C3 generated therebetween. That is, the resonance path LP is formed including the AC power line 104, the stray capacitances C1 and C2, the ground line 106, the housing 130, the stray capacitance C3, the ground 304, and the AC system power supply 300.

  When noise is added to the resonance path LP, noise having a resonance frequency (for example, several MHz) of the resonance path LP is amplified in the resonance path LP. As a result, the conduction emission conducted to AC system power supply 300 increases. As for the noise generation source, for example, the rectifying unit 206 (FIG. 1) of the power receiving device 200 can be a noise source. The high-frequency noise generated in the rectifying unit 206 can be propagated to the power transmission device 100 through the ground 304, for example. In the resonance path LP, since the impedance of the resonance frequency is small, the resonance frequency component of the noise received from the power receiving apparatus 200 through the ground 304 increases in the resonance path LP. In addition, as for the noise generation source, not only the rectifying unit 206 of the power receiving apparatus 200 but also the inverter 122 (FIG. 1) of the power transmission apparatus 100 can be a noise source.

  FIG. 3 is a diagram for explaining a resonance path of noise that can be formed when the filter unit 108 is disposed at a position close to the power conversion unit 118 in the power transmission device 100 illustrated in FIG. 1. .

  Referring to FIG. 3, it is assumed that filter unit 108 is disposed at a position closer to power conversion unit 118 than AC system power supply 300 in AC power line 104. For example, the length D3 of the AC power line 104 between the filter unit 108 and the AC system power supply 300 (connection unit 107) is longer than the length D4 of the AC power line 104 between the filter unit 108 and the power conversion unit 118. Shall.

  By providing the filter unit 108, conduction of noise input from the AC power supply 300 through the AC power line 104 to the power conversion unit 118 is suppressed. However, since noise is superimposed on the portion of the AC power line 104 (length L3) between the AC power supply 300 and the filter unit 108, the stray capacitances C1 and C2 between the AC power line 104 and the ground line 106 are overlapped. A large noise current can flow between the AC power line 104 and the ground line 106.

  Then, even when the filter unit 108 is disposed in the AC power line 104 at a position close to the power conversion unit 118, as in the case where the filter unit 108 is not provided (FIG. 2), the AC power line 104 and the ground line 106 are connected. A noise resonance path LP is formed through the stray capacitances C1 and C2 generated between them and the stray capacitance C3 generated between the housing 130 and the ground 304.

  As described above, if the AC power line 104 is not provided with the filter unit 108, or even if the AC power line 104 is provided with the filter unit 108, the filter unit 108 is temporarily disposed near the power conversion unit 118. In this case, noise at the resonance frequency is amplified in the resonance path LP. As a result, there is a possibility that the conduction emission conducted to the AC system power supply 300 cannot be sufficiently reduced.

  Therefore, referring again to FIG. 1, in power transmission device 100 according to the first embodiment, AC power line 104 is provided with filter unit 108, and filter unit 108 is positioned closer to AC system power supply 300 than power conversion unit 118. It is supposed to be arranged. Specifically, in power transmission device 100 according to the first embodiment, filter unit 108 has a length D1 of AC power line 104A between connection unit 107 and filter unit 108 such that filter unit 108, power conversion unit 118, and so on. It is arrange | positioned at the alternating current power line 104 so that it may become shorter than the length D2 of the alternating current power line 104B in between.

  Such an arrangement of the filter unit 108 shortens a section of the AC power line 104A that can form the resonance path LP (FIGS. 2 and 3), and a noise current (through a stray capacitance between the AC power line 104 and the ground line 106) ( Common mode noise) is reduced. That is, the noise current flowing from the AC system power supply 300 to the AC power line 104 is effectively removed by the filter unit 108 arranged in the AC power line 104 from the AC system power supply 300, and is passed through the stray capacitance from the AC power line 104 (104A). The noise current flowing to the ground line 106 can be reduced. Therefore, according to such a power transmission device 100, it is possible to effectively reduce the noise current that can increase in the resonance path LP as shown in FIGS. As a result, the conduction emission conducted to AC system power supply 300 can be reduced.

  FIG. 4 shows the noise suppression effect of power transmission device 100 according to the first embodiment. As a comparative example, FIG. 5 is a diagram illustrating a noise suppression effect in the case where the filter unit 108 is disposed at a position close to the power conversion unit 118 described in FIG.

  4 and 5, the horizontal axis indicates the frequency of noise, and the vertical axis indicates the noise voltage (the magnitude of noise with respect to the ground). The frequency fr is the resonance frequency (for example, several MHz) of the resonance path LP shown in FIG. As in the power transmission device 100 according to the first embodiment shown in FIG. 1, the filter unit 108 is arranged so that the length D1 of the AC power line 104A is shorter than the length D2 of the AC power line 104B. As shown, the noise voltage can be effectively reduced as compared with the case where the filter unit 108 is disposed near the power converter 118 (FIG. 5) (FIG. 4).

  As described above, in the first embodiment, the filter unit 108 is provided in the AC power line 104 of the power cable 102. The filter unit 108 has a length D1 of the AC power line 104A on the AC system power supply 300 side. The AC power line 104 is provided so as to be shorter than the length D2 of the AC power line 104B on the conversion unit 118 side. Thereby, the section of the AC power line 104A that can form the noise resonance path is shortened, and the noise current flowing through the stray capacitances C1 and C2 between the AC power line 104 and the ground line 106 is reduced. Therefore, according to the first embodiment, it is possible to effectively reduce the noise current that can increase due to the resonance phenomenon. As a result, the conduction emission conducted to AC system power supply 300 can be reduced.

[Embodiment 2]
The second embodiment is different from the first embodiment in the configuration of the filter unit provided in the AC power line 104.

  FIG. 6 is an overall configuration diagram of a power transmission system to which the non-contact power transmission device according to the second embodiment is applied. Referring to FIG. 6, this power transmission system includes power transmission device 100 </ b> A and power reception device 200. Power transmission device 100A includes a filter unit 108A in place of filter unit 108 in the configuration of power transmission device 100 according to the first embodiment shown in FIG.

  Filter unit 108 </ b> A includes a common mode coil 110 and an X capacitor 112. As described with reference to FIG. 1, the common mode coil 110 removes common mode noise superimposed on the AC power line 104. The X capacitor 112 is provided between the line pair of the AC power line 104 (104B), and removes normal mode noise superimposed on the AC power line 104.

  Also in power transmission device 100A according to the second embodiment, filter unit 108A has AC power line 104A length D1 between connection unit 107 and filter unit 108A between filter unit 108A and power conversion unit 118. The AC power line 104 is arranged to be shorter than the length D2 of the AC power line 104B.

  According to the second embodiment, by arranging the filter unit 108A in the AC power line 104 as described above, the noise current (common mode noise) that can increase due to the resonance phenomenon is effectively reduced, and the filter unit 108A. Thus, normal mode noise in the AC power line 104 can also be reduced.

[Embodiment 3]
Also in the third embodiment, the configuration of the filter unit provided in the AC power line 104 is different from the first embodiment.

  FIG. 7 is an overall configuration diagram of a power transmission system to which the non-contact power transmission device according to the third embodiment is applied. With reference to FIG. 7, the power transmission system includes a power transmission device 100 </ b> B and a power reception device 200. Power transmission device 100B includes a filter unit 108B instead of filter unit 108 in the configuration of power transmission device 100 in the first embodiment shown in FIG.

  Filter unit 108B includes a common mode coil 110 and Y capacitors 114 and 116. The common mode coil 110 is as already described. Y capacitor 114 is connected between one of AC power lines 104 </ b> B and ground line 106. Y capacitor 116 is connected between the other end of AC power line 104 </ b> B and ground line 106. Similarly to the common mode coil 110, the Y capacitors 114 and 116 can remove common mode noise superimposed on the AC power line 104.

  Also in power transmission device 100B according to the third embodiment, filter unit 108B has a length D1 of AC power line 104A between connection unit 107 and filter unit 108B, between filter unit 108B and power conversion unit 118. The AC power line 104 is arranged to be shorter than the length D2 of the AC power line 104B.

  According to the third embodiment, since filter unit 108B includes Y capacitors 114 and 116 in addition to common mode coil 110, noise current (common mode noise) that can increase due to a resonance phenomenon is further effectively reduced. be able to. As a result, the conduction emission conducted to AC system power supply 300 can be sufficiently reduced.

[Embodiment 4]
FIG. 8 is an overall configuration diagram of a power transmission system to which the non-contact power transmission device according to the fourth embodiment is applied. With reference to FIG. 8, the power transmission system includes a power transmission device 100 </ b> C and a power reception device 200. Power transmission device 100C further includes a circuit breaker 132 and a housing 134 in the configuration of power transmission device 100B in the third embodiment shown in FIG.

  The circuit breaker 132 is provided in the power cable 102. The circuit breaker 132 is configured to be able to detect a leakage in the power transmission device 100C and an overcurrent of the AC power line 104, and electrically disconnects the AC power line 104 when a leakage or overcurrent is detected. Various known earth leakage circuit breakers and overcurrent circuit breakers can be used as the circuit breaker 132. The housing 134 accommodates the circuit breaker 132.

  In power transmission device 100 </ b> C according to the fourth embodiment, filter unit 108 </ b> B is housed inside casing 134 of circuit breaker 132. As described above, the filter unit 108B is disposed on the AC power line 104 so that the length D1 of the AC power line 104A is shorter than the length D2 of the AC power line 104B. Therefore, the circuit breaker 132 is also used together with the filter unit 108B. The power cable 102 is disposed near the AC system power supply 300.

  According to the fourth embodiment, the increase in the size of the power transmission device 100C accompanying the installation of the filter unit 108B is suppressed as compared to the case where the installation space for the filter unit 108B is separately provided outside the housing 134 of the circuit breaker 132. can do.

  In the fourth embodiment, the circuit breaker 132 and the housing 134 are further included in addition to the configuration of the power transmission device 100B according to the third embodiment shown in FIG. 7, but the embodiment shown in FIG. In addition to the configuration of the power transmission device 100 according to 1 or in addition to the configuration of the power transmission device 100A according to the second embodiment illustrated in FIG. 6, a circuit breaker 132 and a housing 134 may be further included.

  In the second embodiment, the filter unit 108A further includes an X capacitor 112 in addition to the common mode coil 110. In the third and fourth embodiments, the filter unit 108B includes the Y mode in addition to the common mode coil 110. Although the capacitors 114 and 116 are further included, a filter unit including the X capacitor 112 and the Y capacitors 114 and 116 in addition to the common mode coil 110 may be configured.

  Moreover, in each said embodiment, although the power transmission apparatus 100 (100A-100C) shall supply electric power, for example to the power receiving apparatus 200 mounted in the vehicle, the application range of this invention is, It is not necessarily limited to such a vehicle power supply system.

  In the above, the housing 130 corresponds to an embodiment of “metal housing” in the present invention, and the housing 134 corresponds to an embodiment of “another housing” in the present invention. .

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

  100, 100A to 100C Power transmission device, 102 Power cable, 104, 104A, 104B AC power line, 106 Ground line, 107 Connection part, 108, 108A, 108B Filter part, 110 Common mode coil, 112 X capacitor, 114, 116 Y capacitor , 118 Power conversion unit, 120 PFC circuit, 122 inverter, 124 power transmission unit, 126 coil, 128 capacitor, 130, 134, 204 housing, 132 circuit breaker, 200 power reception device, 202 power reception unit, 206 rectification unit, 208 power storage unit , 300 AC system power supply, 304 earth, C1-C3 stray capacitance, LP resonance path.

Claims (2)

A power cable including an AC power line and a ground line connected to the AC system power supply;
A power converter connected to the AC power line and configured to convert power received from the AC power line into transmission power;
A power transmission unit configured to transmit the transmission power supplied from the power conversion unit to the power reception unit in a contactless manner by magnetically coupling with the power reception unit of the power reception device;
A metal casing that houses the power conversion unit and the power transmission unit and is connected to the ground wire;
A filter unit provided on the AC power line and configured to suppress common mode noise;
In the filter unit, the length of the AC power line between the filter unit and the connection unit where the AC power line is connected to the AC system power supply is the AC power line between the filter unit and the power conversion unit. A non-contact power transmission device provided in the AC power line so as to be shorter than the length of the AC power line. A circuit breaker provided in the AC power line;
And further comprising another housing for accommodating the circuit breaker,
The non-contact power transmission device according to claim 1, wherein the filter unit is housed in the other housing.

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