JP2013126301A - Non-contact charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact charger capable of suppressing an adverse effect of an electronic key system upon communication.SOLUTION: When it is determined that a request signal has been received through charger-side antennas 45a, 45b, it is determined that radio communication starts between an electronic key 10 and an on-vehicle apparatus 20, and an alternating current supplied to a primary coil L1 is suppressed. Thus, communication between the electronic key 10 and the on-vehicle 20 is suppressed from being interrupted by power transmission to a portable terminal 50 of a non-contact charger 40.

Description

  The present invention relates to a non-contact charging device that charges a charged device in a non-contact manner.

  2. Description of the Related Art Conventionally, there is a non-contact charging system that charges a device to be charged by transmitting power from the charging device to the device to be charged in a non-contact manner (see, for example, Patent Document 1). Specifically, the charging device is provided with a primary coil, and the charged device is provided with a secondary coil. A power transmission pad on which the device to be charged is installed is formed on the upper surface of the charging device. The primary coil emits a low-frequency radio wave (electromagnetic wave) when excited. Electric power is induced in the secondary coil by this radio wave. This electric power is charged in a battery built in the device to be charged.

  In the future, the spread of charging devices in accordance with the WPC (Wireless Power Consortium) standard, which is an industry group of contactless charging systems, is expected. In this standard, the frequency of radio waves from the primary coil is specified as 100 kHz to 200 kHz.

  On the other hand, an electronic key system that enables locking / unlocking of a vehicle door and starting of an engine through wireless communication between the electronic key and the vehicle is mounted on the vehicle (see, for example, Patent Document 2). In this electronic key system, radio waves in the LF band (typically 134 kHz or 125 kHz) are transmitted from the vehicle to the electronic key.

JP 2008-5573 A JP 2004-92071 A

  When the charging device is mounted on a vehicle, radio frequency interference may occur because the frequencies used between the non-contact charging system and the electronic key system overlap. Specifically, when the charging device is used in a vehicle, the radio wave becomes noise for the electronic key system. As a result, there is a possibility that wireless communication between the electronic key and the vehicle, and thus the engine start, etc., may be disabled. For this reason, when mounting a non-contact charging device on the vehicle, it is required to suppress the influence on the communication of the electronic key system in order to ensure user convenience.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a non-contact charging apparatus in which the influence on communication of the electronic key system is suppressed.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
According to a first aspect of the present invention, in the non-contact charging apparatus that transmits power to the charged apparatus in a non-contact manner by supplying an alternating current to the primary coil, the on-vehicle apparatus at the start of wireless communication between the electronic key and the on-vehicle apparatus A reception antenna that receives a request signal transmitted from the transmission antenna, and detects that the request signal has been received through the reception antenna, it detects that wireless communication has started between the electronic key and the in-vehicle device. The gist of the invention is that it comprises communication monitoring means and control means for suppressing the alternating current supplied to the primary coil when it is determined that the wireless communication is started through the communication monitoring means during power transmission. .

  According to the configuration, when it is determined that the request signal has been received through the receiving antenna, it is determined that the wireless communication is started, and the alternating current supplied to the primary coil is suppressed. Thereby, the electromagnetic wave from a non-contact charging device is suppressed. Therefore, the communication between the electronic key and the in-vehicle device is prevented from being interrupted by power transmission from the non-contact charging device to the charged device.

Moreover, in the said structure, the wired connection between a non-contact charging device and a vehicle-mounted apparatus can be abbreviate | omitted. Therefore, the non-contact charging device can be configured more simply.
According to a second aspect of the present invention, in the contactless charging apparatus according to the first aspect, the receiving antenna detects a magnetic field in a specific axial direction, and the axial direction of the magnetic field is radiated from the primary coil. It is the gist that it is installed in a manner orthogonal to the direction.

  According to this configuration, the receiving antenna detects a magnetic field in a specific axial direction. The receiving antenna is installed such that its axial direction is orthogonal to the direction of the magnetic field radiated from the primary coil. Therefore, reception of radio waves radiated from the primary coil by the receiving antenna is suppressed. Therefore, the reception of the request signal from the transmission antenna due to the radio wave (magnetic field) from the primary coil is suppressed, and the request signal is more reliably received by the reception antenna.

  According to a third aspect of the present invention, in the non-contact charging apparatus according to the second aspect, the receiving antenna is installed in such a manner that its axial direction follows the direction of the magnetic field radiated from the transmitting antenna. It is a summary.

  According to this configuration, the receiving antenna can reliably receive only the request signal from the transmitting antenna. Therefore, it is possible to more reliably suppress electromagnetic waves from the non-contact charging device when starting wireless communication.

  According to a fourth aspect of the present invention, in the non-contact charging apparatus according to the third aspect, the reception antenna includes a first reception antenna that detects a magnetic field in the first axial direction, and the first axial direction. And a second receiving antenna for detecting a magnetic field in a second axis direction perpendicular to each other, and the first receiving antenna and the second receiving antenna radiate from the primary coil in a plane formed by mutually orthogonal axes. The gist of the present invention is that the plane formed by the axes orthogonal to each other is set in a mode that is orthogonal to the direction of the magnetic field to be generated and that is aligned with the direction of the magnetic field radiated from the transmitting antenna.

  According to this configuration, a magnetic field other than the direction of the magnetic field radiated from the primary coil can be received through both receiving antennas. Thus, the magnetic field from the transmission antenna is received while suppressing the reception of the magnetic field from the primary coil by both reception antennas.

  ADVANTAGE OF THE INVENTION According to this invention, the influence with respect to communication of an electronic key system can be suppressed in a non-contact charging device.

The block diagram which shows the structure of a vehicle. The perspective view of the non-contact charging device with which the portable terminal was installed in the power transmission pad. Sectional drawing which shows structures, such as a non-contact charging device.

Hereinafter, an embodiment of a non-contact charging device according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, the vehicle includes a non-contact charging device 40 and an in-vehicle device 20. This in-vehicle device 20 permits the start of the engine through mutual communication with the electronic key 10 possessed by the user. The non-contact charging device 40 is configured to be able to charge the mobile terminal 50 possessed by the user in a non-contact manner. Hereinafter, specific configurations of the electronic key 10, the in-vehicle device 20, and the non-contact charging device 40 will be described.

<Electronic key>
The electronic key 10 includes an electronic key control unit 11 configured by a computer unit including a CPU. The electronic key control unit 11 is connected to an LF receiving unit 12 that receives a radio signal in the LF (Low Frequency) band and a UHF transmission unit 13 that transmits a radio signal in the UHF (Ultra High Frequency) band. .

  When the LF receiver 12 receives a request signal that is an LF-band radio signal transmitted from the in-vehicle device 20 via its own LF receiving antenna 12a, the LF receiver 12 demodulates the request signal and performs electronic key control on the demodulated signal. To the unit 11.

  The electronic key control unit 11 includes a nonvolatile memory 11a, and an ID code unique to the electronic key 10 is stored in the memory 11a. When the electronic key control unit 11 recognizes the request signal, the electronic key control unit 11 outputs a response signal including the ID code stored in the memory 11 a to the UHF transmission unit 13. The UHF transmission unit 13 modulates the response signal and transmits the modulated response signal as a UHF band radio signal via the transmission antenna 13a.

<In-vehicle device>
As shown in FIG. 1, the in-vehicle device 20 includes an ECU 21 configured by a computer unit. The ECU 21 is connected to an LF transmission unit 23 that transmits an LF band radio signal and a UHF reception unit 24 that receives a UHF band radio signal.

  An LF transmission antenna 23 a is connected to the LF transmission unit 23, and a UHF reception antenna 24 a is connected to the UHF reception unit 24. The LF transmission antenna 23a is a bar antenna in which an electric wire is wound around a rod-shaped core having a high magnetic permeability such as ferrite. Further, as shown in FIG. 3, the LF transmitting antenna 23a is installed in a state where it is laid on the floor of the vehicle, for example, such that its axis is along the horizontal direction of the vehicle (the left-right direction in the figure).

  Further, as shown in FIG. 1, an engine switch 33 and a courtesy switch 34 are connected to the ECU 21. The courtesy switch 34 detects the open / closed state of the vehicle door, and outputs the detection result to the ECU 21. The engine switch 33 is provided in the vicinity of the driver's seat so that it can be pushed. When the engine switch 33 is pushed, an operation signal to that effect is output to the ECU 21.

The ECU 21 includes a nonvolatile memory 21a, and the same ID code as the ID code of the electronic key 10 is stored in the memory 21a.
When the ECU 21 determines that the vehicle door is opened and closed through the courtesy switch 34 after unlocking the vehicle door, the ECU 21 generates a request signal and outputs the generated request signal to the LF transmitter 23. When a request signal is input from the ECU 21, the LF transmission unit 23 modulates the request signal and transmits the modulated request signal into the vehicle via the LF transmission antenna 23a.

  When receiving the response signal transmitted from the electronic key 10 via its own UHF receiving antenna 24a, the UHF receiving unit 24 demodulates this signal into a pulse signal, and outputs the demodulated response signal to the ECU 21.

  When the ECU 21 recognizes the response signal, the ECU 21 collates the ID code included in the response signal with the ID code stored in the memory 21a. When the ECU 21 determines that the ID code verification has been established, the ECU 21 is in an engine start permission state. When the ECU 21 recognizes that the engine switch 33 has been operated in this state, the ECU 21 starts the engine.

<Non-contact charging device and portable terminal>
As shown in FIG. 2, the non-contact charging device 40 has a power transmission pad 40 a on which the portable terminal 50 can be installed. The non-contact charging device 40 is attached to the vehicle interior with the power transmission pad 40a exposed. The user can charge the portable terminal 50 simply by placing the portable terminal 50 on the power transmission pad 40a.

  As shown in FIG. 1, the non-contact charging device 40 includes a charging control device 41, a plurality of excitation circuits 42, the same number of primary coils L1, an interference suppression unit 45, and charging device side receiving antennas 45a and 45b. With.

The portable terminal 50 includes a secondary coil L2, a rectifier circuit 52, a converter 53, a battery 54, and a load modulation circuit 55.
Each primary coil L1 is provided along the power transmission pad 40a inside the apparatus. The primary coil L1 is a spiral coil. As shown in FIG. 3, the axis | shaft of each primary coil L1 is extended in the up-down direction of the figure so that it may orthogonally cross the surface of the power transmission pad 40a. Each primary coil L <b> 1 is connected to each excitation circuit 42. Each excitation circuit 42 is connected to a power source and a ground.

  The charging control device 41 supplies an alternating current to the primary coil L1 through the excitation circuit 42. Thereby, the primary coil L1 is excited and emits radio waves (electromagnetic waves). As described in the background art, the frequency of the radio wave is specified as 100 kHz to 200 kHz in the WPC standard. The charge control device 41 monitors the current supplied to the primary coil L1.

  In a state where the portable terminal 50 is installed on the power transmission pad 40a, the axis of the secondary coil L2 is orthogonal to the surface of the power transmission pad 40a. The secondary coil L2 induces a current by electromagnetic waves from the primary coil L1 (electromagnetic induction). The rectifier circuit 52 converts the induced alternating current into a direct current, and outputs the converted current to the converter 53. Converter 53 steps down or boosts the power and supplies the power to battery 54. Thereby, the battery 54 is charged.

  The charging control device 41 performs polling to determine whether or not the mobile terminal 50 is installed on the power transmission pad 40a. Specifically, the charging control device 41 excites the primary coil L1 by intermittently supplying an alternating current to the primary coil L1. As a result, a polling signal (radio wave) is transmitted from the primary coil L1.

  The load modulation circuit 55 of the portable terminal 50 performs load modulation when receiving a polling signal through the secondary coil L2. Specifically, when receiving a polling signal, the load modulation circuit 55 switches between a connection state in which a load (not shown) is connected to the secondary coil L2 and a non-connection state in which no load is connected to the secondary coil L2. . When in this connected state, the impedance viewed from the primary coil L1 that is magnetically coupled to the secondary coil L2 increases more than in the disconnected state. Therefore, the current supplied to the primary coil L1 changes. The charging control device 41 determines that the portable terminal 50 is installed on the power transmission pad 40a through this change in current, and when it is determined to do so, the primary coil L1 is continuously excited to actually activate the portable terminal 50. Charge the battery.

  A drain terminal and a source terminal of an FET (field effect transistor) 46 are connected between each excitation circuit 42 and the power source. When a voltage is applied to the base terminal of the FET 46 by the interference suppressing unit 45, the drain terminal and the source terminal of the FET 46 are brought into conduction. This is the ON state of the FET 46.

  Two charging device side receiving antennas 45 a and 45 b are connected to the interference suppressing unit 45. Both charging device-side receiving antennas 45a and 45b are bar antennas in which an electric wire is wound around a rod-shaped core having a high magnetic permeability such as ferrite, like the LF transmitting antenna 23a. A resonance capacitor (not shown) is connected in parallel to each of the receiving antennas 45a and 45b. As shown in FIG. 3, charging device side receiving antennas 45a and 45b detect a magnetic field in the vehicle horizontal direction (left and right direction in the figure).

  The charging device-side receiving antenna 45a extends in the left-right direction in FIG. The charging device side receiving antenna 45a is installed such that its axial direction is orthogonal to the direction of the magnetic field radiated from the primary coil L1 and along the direction of the magnetic field radiated from the LF transmitting antenna 23a. The charging device side receiving antenna 45b extends in the direction perpendicular to the paper surface of FIG. As shown in an enlarged manner in the circle of FIG. 3, both charging device side receiving antennas 45 a and 45 b are installed such that the respective axes are along the horizontal direction of the vehicle and the respective axes are orthogonal to each other.

  As shown in FIG. 3, when transmitting a request signal, the LF transmitting antenna 23a applies a magnetic field in a direction along the axis of the charging device side receiving antenna 45a. In other words, the positional relationship between the LF transmission antenna 23a and the charging device side reception antenna 45a is set in this way. Therefore, the charging device side receiving antenna 45a induces a current based on the magnetic field from the LF transmitting antenna 23a. In this example, the charging device-side receiving antenna 45b does not induce current based on the magnetic field from the LF transmitting antenna 23a.

  On the other hand, a magnetic field is radiated from the primary coil L1 in a direction orthogonal to the surface of the power transmission pad 40a. Therefore, in the installation mode of the non-contact charging device 40 of this example, a magnetic field in a direction perpendicular to the axes is applied from the primary coil L1 to the charging device-side receiving antennas 45a and 45b. Therefore, the charging device side receiving antennas 45a and 45b do not induce current based on the magnetic field from the primary coil L1.

  The interference suppression unit 45 recognizes the voltage induced in the charging device-side receiving antenna 45a, and compares the voltage value with a threshold value stored in advance. When the interference suppression unit 45 determines that the voltage value is equal to or greater than the threshold value, the interference suppression unit 45 determines that wireless communication between the electronic key 10 and the in-vehicle device 20 starts, and turns the FET 46 off for a certain period of time. This fixed time is set to the time required for the wireless communication, that is, transmission / reception of the request signal and the response signal. Thereby, the electromagnetic waves from the non-contact charging device 40 are blocked. Therefore, subsequent transfer of a request signal or a response signal between the electronic key 10 and the in-vehicle device 20 is suppressed from being obstructed by the non-contact charging device 40. When the interference suppression unit 45 determines that a certain time has elapsed, the interference suppression unit 45 switches the FET 46 to the ON state again. As described above, the interference suppression unit 45 functions as a communication monitoring unit that determines the start of communication of the electronic key system and a control unit that controls power supply to the primary coil L1.

As described above, according to the embodiment described above, the following effects can be obtained.
(1) When it is determined that the request signal has been received through the charging device side receiving antennas 45a and 45b, it is determined that wireless communication is started between the electronic key 10 and the in-vehicle device 20, and is supplied to the primary coil L1. AC current is cut off. Thereby, it is suppressed that communication between the electronic key 10 and the vehicle-mounted apparatus 20 is obstructed by power transmission to the portable terminal 50 of the non-contact charging device 40.

  Moreover, the wired connection between the non-contact charging device 40 and the in-vehicle device 20 can be omitted. Therefore, the non-contact charging device 40 can be configured more simply. For example, in the case where the non-contact charging device 40 is a type that is retrofitted to the vehicle, troubles such as wiring are not required when retrofitting. Further, even when the non-contact charging device 40 that is normally used at home is used in a vehicle, the influence on the communication of the electronic key system can be similarly suppressed.

  (2) The charging device side receiving antennas 45a and 45b detect a magnetic field in a specific axial direction. The charging device side receiving antennas 45a and 45b are installed such that the axial direction thereof is orthogonal to the direction of the magnetic field radiated from the primary coil L1. Here, the LF transmission antenna 23a is provided along the floor surface of the vehicle. Further, the charging device side receiving antennas 45a and 45b are installed so that their axes are orthogonal to each other and any of the axes is along the direction of the magnetic field radiated from the LF transmitting antenna 23a. In this example, the axial direction of the charging device side receiving antenna 45a is along the direction of the magnetic field radiated from the LF transmitting antenna 23a. Therefore, it is suppressed that only the request signal from the LF transmitting antenna 23a is received by the charging device side receiving antenna 45a and the radio wave from the primary coil L1 is received. Therefore, the reception of the request signal from the LF transmission antenna 23a by the radio wave (magnetic field) from the primary coil L1 is suppressed, and the request signal is more reliably received through the charging device side reception antennas 45a and 45b. .

  In addition, although the charging device-side receiving antennas 45a and 45b receive radio waves from the primary coil L1 and no communication is performed between the electronic key 10 and the in-vehicle device 20, the mobile terminal 50 is erroneously connected. Stopping power transmission is suppressed.

  (3) Both charging device side receiving antennas 45a and 45b are installed such that both axes are along the horizontal direction of the vehicle and are orthogonal to each other. Therefore, if the magnetic field from the LF transmission antenna 23a is along the surface formed by both axes of the charging device side reception antennas 45a and 45b, the charging device side reception antennas 45a and 45b can receive radio waves from the LF transmission antenna 23a. . Therefore, the freedom degree of installation of the non-contact charging device 40 is improved.

In addition, the said embodiment can be implemented with the following forms which changed this suitably.
In the above embodiment, the charging device-side receiving antenna 45a is installed such that its axial direction follows the direction of the magnetic field radiated from the LF transmitting antenna 23a. However, if the magnetic field from the LF transmitting antenna 23a is along the surface formed by both axes of the charging device side receiving antennas 45a and 45b, the same effects as those of the above embodiment can be obtained. In this case, the magnetic fields received by both receiving antennas 45a and 45b are combined. This synthesized magnetic field is output as a voltage value. The interference suppression unit 45 blocks electromagnetic waves from the non-contact charging device 40 based on this voltage value. According to this configuration, the degree of freedom of installation of the non-contact charging device 40 is improved.

  In the above embodiment, the electromagnetic wave from the non-contact charging device 40 is blocked by turning off the FET 46. However, the configuration is not limited to the above as long as electromagnetic waves from the non-contact charging device 40 can be blocked. For example, the power supply of the entire contactless charging device 40 may be turned off. According to this configuration, the electromagnetic waves from the non-contact charging device 40 can be blocked more easily.

  Further, for example, a relay circuit may be provided between the excitation circuit 42 and the primary coil L1. This relay circuit has first to third terminals. The first terminal is connected to the excitation circuit 42, the second terminal is connected to the lower end of the primary coil L1, and the third terminal is connected to the ground. When the movable contact is displaced between the second and third terminals, the primary coil L1 is connected to either the excitation circuit 42 or the ground. When the interference suppression unit 45 determines that the voltage value is equal to or greater than the threshold value, the interference suppression unit 45 connects the primary coil L1 to the ground through a relay circuit for a certain period of time. Thereby, the electromagnetic waves from the non-contact charging device 40 are blocked.

  -Moreover, you may suppress the electromagnetic waves from the primary coil L1 by increasing the impedance of the antenna system containing the primary coil L1. Specifically, a matching circuit is provided between the excitation circuit 42 and the primary coil L1. The matching circuit matches the impedance between the primary coil L1 and the power path, thereby suppressing the reflection loss of the electric energy of the antenna system including the primary coil L1. When the interference suppression unit 45 determines that the voltage value is equal to or greater than the threshold value, the interference suppression unit 45 increases the impedance of the antenna system through the matching circuit over a certain period of time. Thereby, the alternating current supplied to the primary coil L1 decreases, and as a result, the electromagnetic waves from the primary coil L1 can be suppressed.

  In the above embodiment, when a request signal is transmitted from the LF transmission antenna 23a into the vehicle, electromagnetic waves from the non-contact charging device 40 are suppressed. However, electromagnetic waves from the non-contact charging device 40 may be suppressed also when a request signal is transmitted from a transmission antenna provided outside the vehicle (for example, inside the door handle). The ECU 21 permits locking / unlocking of the vehicle door when it is determined that the ID code of the response signal for the request signal to the outside of the vehicle has been verified.

  In the above embodiment, the charging device side receiving antennas 45a and 45b are installed such that each axis is along the horizontal direction of the vehicle and each axis is orthogonal. However, if the radio wave from the LF transmitting antenna 23a can be received, both axes of the charging device side receiving antennas 45a and 45b may not be orthogonal to each other. Moreover, the charging device side receiving antennas 45a and 45b may be one. In this case, it is necessary to install one charging device side receiving antenna so that the axis thereof follows the direction of the magnetic field from the LF transmitting antenna 23a.

In the above embodiments, the non-contact charging device 40 is an electromagnetic induction type, but may be a magnetic resonance type.
Next, the technical idea that can be grasped from the embodiment will be described together with the effects.

  (B) The contactless charging device according to any one of claims 1 to 3, further comprising a switching element provided in a power feeding path from a power source to the primary coil, wherein the control device performs the communication during power transmission. A non-contact charging device that shuts off the power supplied to the primary coil by turning off the switching element when it is determined that wireless communication is started through the monitoring unit.

  According to this configuration, when wireless communication between the electronic key and the in-vehicle device is started, the switching element is turned off. As a result, the power supplied to the primary coil is shut off. Therefore, electromagnetic waves from the non-contact charging device are stopped during wireless communication. Therefore, interference of wireless communication due to electromagnetic waves from the non-contact charging device is more reliably suppressed.

  (B) In the non-contact charging apparatus according to claim 3, the receiving antenna detects a magnetic field in a biaxial direction, and a surface formed by the two axes is along a direction of a magnetic field radiated from the transmitting antenna. Non-contact charging device installed.

  According to this configuration, only the request signal from the transmission antenna can be obtained by setting the position and orientation of the reception antenna in a mode in which the direction of the magnetic field radiated from the transmission antenna is aligned with the surface formed by the two axes of the reception antenna. It can be received reliably. Therefore, the freedom degree of installation of a non-contact charging device can be improved. This is particularly effective when the non-contact charging device is retrofitted to the vehicle.

  DESCRIPTION OF SYMBOLS 10 ... Electronic key, 20 ... In-vehicle device, 21 ... ECU, 23a ... LF transmission antenna, 33 ... Engine switch, 34 ... Courtesy switch, 40 ... Non-contact charging device, 40a ... Power transmission pad, 41 ... Charge control device, 42 ... Excitation circuit, 45 ... interference suppression unit (control means, communication monitoring means), 45a, 45b ... charging device side receiving antenna, 46 ... FET, 50 ... mobile terminal (charged device).

Claims (4)

In a non-contact charging device that transmits power to a charged device in a non-contact manner by supplying an alternating current to a primary coil,
A receiving antenna that receives a request signal transmitted from the transmitting antenna of the in-vehicle device at the start of wireless communication between the electronic key and the in-vehicle device;
Communication monitoring means for detecting that wireless communication has started between the electronic key and the in-vehicle device when it is determined that the request signal has been received through the reception antenna;
A non-contact charging apparatus comprising: a control unit that suppresses an alternating current supplied to the primary coil when it is determined that the wireless communication is started through the communication monitoring unit during power transmission. The contactless charging device according to claim 1,
The receiving antenna is a non-contact charging apparatus that detects a magnetic field in a specific axial direction and is installed in a manner in which the axial direction is orthogonal to the direction of the magnetic field radiated from the primary coil. In the non-contact charging device according to claim 2,
The said receiving antenna is a non-contact charging device installed in the aspect in which the axial direction follows the direction of the magnetic field radiated | emitted from the said transmitting antenna. In the non-contact charging device according to claim 3,
The receiving antenna includes a first receiving antenna that detects a magnetic field in a first axial direction, and a second receiving antenna that detects a magnetic field in a second axial direction orthogonal to the first axial direction. ,
In the first receiving antenna and the second receiving antenna, the surfaces formed by the mutually orthogonal axes are orthogonal to the direction of the magnetic field radiated from the primary coil, and the surfaces formed by the mutually orthogonal axes Is a non-contact charging apparatus installed in a manner along the direction of the magnetic field radiated from the transmitting antenna.