JP2014121142A - Power transmission apparatus and non-contact power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission apparatus in which abnormality of an AC power supply due to the distance between a primary coil and a secondary coil in the vehicle height direction can be avoided, and to provide a non-contact power transmission device including the power transmission apparatus.SOLUTION: A non-contact power transmission device 10 includes a ground side apparatus 11 having a high frequency power supply 12 and a primary coil 13a receiving high frequency power therefrom, and a vehicle-side apparatus 21 mounted on a vehicle C, and having a secondary coil 23a capable of receiving high frequency power from a power transmission unit 13 in non-contact. Based on the height H between respective coils 13a, 23a, output of high frequency power from the high frequency power supply 12 can be limited.

Description

  The present invention relates to a power transmission device and a contactless power transmission device including the power transmission device.

  2. Description of the Related Art Conventionally, as a non-contact power transmission device that does not use a power cord or a power transmission cable, for example, a device using magnetic field resonance is known. For example, the non-contact power transmission device of Patent Literature 1 includes a power transmission device having an AC power source and a primary coil to which AC power is input from the AC power source. The non-contact power transmission apparatus includes a power receiving device having a primary side coil and a secondary side coil capable of magnetic field resonance. Then, AC power is transmitted from the power transmitting device to the power receiving device due to magnetic field resonance between the primary side coil and the secondary side coil.

JP 2009-106136 A

  Here, for example, when power is transmitted between the primary coil and the secondary coil facing each other in the vehicle height direction of the vehicle, between the primary coil and the secondary coil. Depending on the distance in the vehicle height direction, an excessive voltage or current may be generated in the AC power supply, and an abnormality may occur in the AC power supply.

In addition, the situation mentioned above is not restricted to the structure which transmits electric power by magnetic field resonance, For example, it is the same also about the structure which transmits electric power by electromagnetic induction.
The present invention has been made in view of the above-described circumstances, and a power transmission device capable of avoiding an abnormality in an AC power source caused by a distance in a vehicle height direction between a primary side coil and a secondary side coil and the power transmission thereof. An object of the present invention is to provide a non-contact power transmission device including equipment.

  A power transmission device that achieves the above object includes an AC power source capable of outputting AC power, and a primary side coil to which the AC power is input, and a secondary side coil included in a power receiving device mounted on a vehicle. In the power transmission device capable of transmitting the AC power in a non-contact manner, the primary side coil is disposed to face at least a part of the secondary side coil in the vehicle height direction of the vehicle, and the AC power source Is characterized in that the output of the AC power can be limited based on distance information in the vehicle height direction between the primary side coil and the secondary side coil.

  According to such a configuration, by restricting the output of AC power from the AC power source based on distance information in the vehicle height direction between the coils, it is possible to avoid generation of excessive voltage or current in the AC power source. be able to. Thereby, the abnormality of AC power supply resulting from the distance of the height direction between each coil can be avoided.

  With respect to the power transmission device, the AC power source has a distance in the vehicle height direction between the primary side coil and the secondary side coil that is out of a predetermined allowable range in a situation where the AC power is being output. When it is specified, it is preferable that the output of the AC power is stopped or the AC power value is controlled to be small. According to such a configuration, in the situation where AC power is being output, if the distance in the vehicle height direction between the coils deviates from the allowable range, the output of AC power is stopped or the power value of AC power Becomes smaller. Thereby, the abnormality of AC power supply resulting from the distance of the height direction between each coil can be avoided.

  Regarding the power transmission device, the distance information includes information related to a vehicle height of the vehicle, and includes predetermined specific information, and the AC power supply is configured based on the specific information. When it is specified that the distance in the vehicle height direction between the secondary coils is out of a predetermined allowable range, it is preferable that the start of the output of the AC power is prohibited. According to such a configuration, when the distance between the primary coil and the secondary coil in the vehicle height direction is out of the predetermined allowable range is specified by the specific information, AC power is not output. . Thereby, the abnormality of AC power supply resulting from the distance of the height direction between each coil can be avoided.

  Further, the non-contact power transmission apparatus may include any of the power transmission devices described above and the power receiving device. According to such a configuration, in the non-contact power transmission device, it is possible to avoid an abnormality of the AC power source due to the distance in the vehicle height direction between the coils.

  According to the present invention, it is possible to avoid an abnormality in the AC power source due to the distance in the vehicle height direction between the primary side coil and the secondary side coil.

The schematic diagram which shows typically power transmission equipment and a non-contact electric power transmission apparatus. The flowchart which shows a vehicle side charge process. The flowchart which shows a power supply side charge process. The schematic diagram which shows typically the non-contact electric power transmission apparatus of 2nd Embodiment. The flowchart which shows the power supply side charge process of 2nd Embodiment. The flowchart which shows the vehicle side charge process of 2nd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of a power transmission device and a non-contact power transmission device will be described.
As shown in FIG. 1, the non-contact power transmission device (non-contact power transmission system) 10 includes a ground-side device 11 provided on the ground and a vehicle-side device 21 mounted on the vehicle C. The ground side device 11 corresponds to a power transmission device (primary side device, power transmission device), and the vehicle side device 21 corresponds to a power reception device (secondary side device, power reception device).

  The ground side device 11 includes a high frequency power source 12 (AC power source) capable of outputting high frequency power (AC power) having a predetermined frequency. The high-frequency power source 12 is configured to be able to output a plurality of types of high-frequency power having different power values using the system power.

  The high-frequency power output from the high-frequency power source 12 is transmitted to the vehicle-side device 21 in a non-contact manner, and used for charging the vehicle battery 22 (power storage unit) provided in the vehicle-side device 21. Specifically, the non-contact power transmission device 10 is provided in the vehicle-side device 21 and the power transmitter 13 provided in the ground-side device 11 for performing power transmission between the ground-side device 11 and the vehicle-side device 21. Power receiver 23. High frequency power is input to the power transmitter 13.

  The power transmitter 13 and the power receiver 23 are configured to be capable of magnetic field resonance. Specifically, the power transmitter 13 includes a resonance circuit including a primary coil 13a and a primary capacitor 13b connected in parallel. The power receiver 23 is composed of a resonance circuit including a secondary coil 23a and a secondary capacitor 23b connected in parallel. Both resonance frequencies are the same.

  According to this configuration, when high-frequency power is input from the high-frequency power source 12 to the power transmitter 13 (primary coil 13a), the power transmitter 13 and the power receiver 23 (secondary coil 23a) magnetically resonate. As a result, the power receiver 23 receives a part of the energy of the power transmitter 13. That is, the power receiver 23 receives high frequency power from the power transmitter 13.

  Incidentally, the power receiver 23 (secondary coil 23a) is disposed at the bottom of the vehicle C. The power transmitter 13 is disposed below the vehicle C so as to be able to face the power receiver 23 in the vehicle height direction. That is, the power transmitter 13 and the power receiver 23 can face the vehicle C in the vehicle height direction.

  In such a configuration, the position of the power receiver 23 in the vehicle C is fixed. For this reason, the height H between the coils 13a and 23a, which is the distance in the vehicle height direction between the coils 13a and 23a, corresponds to the vehicle height. That is, by grasping the vehicle height, the height H between the coils 13a and 23a can be estimated. Note that the height H between the coils 13 a and 23 a can be said to be the height between the power transmitter 13 and the power receiver 23.

  Although the ground side device 11 is shown to be in the ground for the purpose of illustration, the high frequency power source 12 and the power source side controller 14 are actually installed on the ground. The power transmitter 13 (primary coil 13a) is disposed at a position where it can face at least a part of the power receiver 23 (secondary coil 23a) installed at the bottom of the vehicle C in the vehicle height direction. For example, it may be embedded in the ground, or may be installed on the ground or higher.

  The vehicle-side device 21 includes a rectifier 24 as a rectifier that rectifies high-frequency power received by the power receiver 23 into DC power. The vehicle battery 22 is composed of, for example, a plurality of battery cells connected in series, and is charged when DC power is input from the rectifier 24.

  Between the rectifier 24 and the vehicle battery 22, a detection sensor 25 that detects the state of charge (SOC, charge amount) of the vehicle battery 22 is provided. The detection result of the detection sensor 25 is input to the vehicle-side controller 26 provided in the vehicle-side device 21. Thereby, the vehicle-side controller 26 can grasp the state of charge of the vehicle battery 22.

  In addition, the vehicle-side device 21 is provided with a vehicle height detection unit 27 that detects the vehicle height that is the height of the vehicle C. The vehicle height detection unit 27 is configured to be able to detect a change in vehicle height, and transmits the detection result to the vehicle-side controller 26.

  The specific configuration of the vehicle height detection unit 27 is arbitrary. For example, a configuration using a vehicle height sensor that outputs a detection signal corresponding to the positional relationship between the vehicle body and the axle of the tire, or a configuration that detects by reflection of electromagnetic waves. Etc. may be used.

  The ground side device 11 is provided with a power source side controller 14 that controls the high frequency power source 12. The power supply side controller 14 is configured to be capable of wireless communication with the vehicle side controller 26.

  Each of the controllers 14 and 26 is disposed such that the power transmitter 13 (primary coil 13a) faces at least a part (preferably all) of the power receiver 23 (secondary coil 23a) in the vehicle height direction of the vehicle C. In this case, a charging process for charging the vehicle battery 22 is performed by exchanging information with each other. In the charging process, it is determined whether to limit the output of the high-frequency power from the high-frequency power source 12 based on the vehicle height.

  The charging process executed by each controller 14 and 26 will be described in detail. For convenience of explanation, first, the vehicle side charging process executed by the vehicle side controller 26 will be described, and then the power supply side charging process executed by the power supply side controller 14 will be described.

  As shown in FIG. 2, in the vehicle-side charging process, first, in step S101, the process waits until power-side specific information as a kind of distance information is received. The power supply side unique information is transmitted from the power supply side controller 14 and is position information of the primary side coil 13a, for example, information on the height of the vehicle C from the ground in the vehicle height direction. The power supply side specific information is determined in advance by the specifications of the ground side device 11.

  When the power supply side specific information is received, the process proceeds to step S102, and the coils 13a, 13a, 13c, 13c, 13c, 13c are respectively based on the power supply side specific information and the vehicle side specific information as a kind of distance information stored in the vehicle side controller 26. The height H between 23a is calculated. The vehicle-side specific information is information relating to the position of the secondary coil 23a in the vehicle height direction of the vehicle C, for example, information relating to the height from the ground to the secondary coil 23a when the vehicle height is in the initial state. is there. The initial state may be, for example, a state where no load or the like is loaded on the vehicle C.

In subsequent step S103, it is determined whether or not the calculated height H between the coils 13a and 23a is within a predetermined allowable range (Hmin to Hmax).
Here, the permissible range is set based on the specifications of the high frequency power supply 12 so that power can be transmitted between the power transmitter 13 and the power receiver 23 within a range where no abnormality occurs in the high frequency power supply 12. . More specifically, when the height H between the coils 13a and 23a is excessively high, it is difficult to perform power transmission between the power transmitter 13 and the power receiver 23, or the transmission efficiency is significantly reduced. Further, according to the height H between the coils 13a and 23a, the impedance from the output end of the high frequency power source 12 to the vehicle battery 22 varies, and the power value of the high frequency power output from the high frequency power source 12 varies. Then, the voltage or current in the high frequency power supply 12 varies. In this case, depending on the height H between the coils 13 a and 23 a, the voltage or current in the high frequency power supply 12 may exceed an allowable value determined in advance in the specifications of the high frequency power supply 12.

  On the other hand, the allowable range is such that the voltage or current in the high-frequency power source 12 does not exceed the allowable value, and the transmission efficiency between the power transmitter 13 and the power receiver 23 exceeds the predetermined minimum efficiency. Is set to

  The allowable value of the voltage or current in the high-frequency power source 12 is determined by the withstand voltage of each element constituting the high-frequency power source 12, and for example, when a switching element is included as an element constituting the high-frequency power source 12. Is considered to be a withstand voltage value of the switching element.

  If the height H calculated in step S102 is out of the allowable range, it is determined that the high frequency power supply 12 is abnormal or power transmission is difficult, and the vehicle side is not output from the high frequency power supply 12 without outputting high frequency power. The charging process ends. That is, the start of the output of the high frequency power from the high frequency power supply 12 is prohibited.

  On the other hand, if the calculated height H is within the allowable range, a power ON command is transmitted to the power controller 14 in step S104. Thereafter, in steps S105 to S109, the vehicle height fluctuation is periodically detected, and the high frequency power supply 12 corresponding to the vehicle height fluctuation is controlled.

  Specifically, first, in step S105, detection information (distance information) that is a detection result by the vehicle height detection unit 27 is acquired. In subsequent step S106, the height H between the coils 13a and 23a is calculated based on the detection information and the power source side unique information. In step S107, it is determined whether or not the height H calculated in step S106 is within an allowable range. When the height H is within the allowable range, the process proceeds to step S108, where the current charging state is acquired based on the detection result of the detection sensor 25, and it is determined whether or not the current charging state is a charging completion state. In addition, about the said determination, the determination of whether the charge amount is a predetermined charge completion opportunity amount etc. can be considered, for example.

  If the charging state is not the charging completion state, a negative determination is made in step S108, and the process returns to step S105. If it is determined in step S107 that the height H is out of the allowable range, or if it is determined in step S108 that the state of charge has been completed, a power OFF command is transmitted in step S109. The vehicle side charging process is terminated.

Next, the power supply side charging process executed by the power supply controller 14 will be described.
As shown in FIG. 3, first, in step S <b> 201, the power-side specific information stored in the power-side controller 14 is transmitted to the vehicle-side controller 26. In step S202, the process waits until a power ON command is received. The power ON command is transmitted in step S104 of the vehicle side charging process executed by the vehicle side controller 26. When the power-on command reception standby time has elapsed for a predetermined time, the power-side charging process may be terminated without receiving the power-on command.

  When the power ON command is received, the process proceeds to step S203, and the high frequency power supply 12 is controlled so that the output of the high frequency power from the high frequency power supply 12 is started. Thereby, charging of the vehicle battery 22 is started.

  Thereafter, in step S204, the process waits until a power-off command is received. The power OFF command is transmitted in step S109 of the vehicle side charging process executed by the vehicle side controller 26.

  When the power OFF command is received, the process proceeds to step S205, the high frequency power supply 12 is controlled so that the output of the high frequency power from the high frequency power supply 12 is stopped, and the power supply side charging process is terminated. Thereby, charging of the battery 22 for vehicles is complete | finished.

Next, the operation of this embodiment will be described.
Based on the height H between the coils 13a and 23a, it is determined whether or not high-frequency power output from the high-frequency power source 12 is started and whether or not high-frequency power output is continued. Specifically, if the height H calculated from each unique information is out of the allowable range, it is determined that the combination of the ground side device 11 and the vehicle side device 21 this time is not suitable for power transmission. High frequency power is not output from the power supply 12 (output of high frequency power is not started).

  Even if the height H calculated from each unique information is within the allowable range, the height H between the coils 13a and 23a is detected by the detection information of the vehicle height detection unit 27 during charging of the vehicle battery 22. Is determined to be out of the allowable range, the output of the high-frequency power from the high-frequency power source 12 is stopped regardless of the state of charge of the vehicle battery 22.

According to the embodiment described in detail above, the following excellent effects are obtained.
(1) Based on each unique information or detection information as distance information, the height H between the coils 13a and 23a facing each other in the vehicle height direction is calculated, and a high frequency from the high frequency power source 12 is calculated based on the calculation result. The power output is limited. Thereby, it is possible to avoid power transmission in a state where the high frequency power supply 12 is abnormal and troubled due to the height H between the coils 13a and 23a.

  (2) A vehicle height detection unit 27 for detecting the vehicle height is provided, and the height H between the coils 13a and 23a is determined in advance based on the vehicle height detection unit 27 in a situation where the high frequency power supply 12 outputs high frequency power. When it is determined that the frequency is out of the allowable range, the high-frequency power output is stopped. Thereby, abnormality of the high frequency power supply 12 resulting from the fluctuation | variation of vehicle height can be avoided.

  In particular, if a load or the like is loaded on the vehicle C or the load or the like is lowered while the vehicle battery 22 is being charged, the vehicle height fluctuates, resulting in the height of the power receiver 23 (secondary coil 23a). Can fluctuate. On the other hand, according to the present embodiment, the vehicle height detection unit 27 that detects the vehicle height is provided, and based on the detection information by the vehicle height detection unit 27, it is determined whether or not the output of the high-frequency power is continued. Thus, it is possible to suitably cope with the above-described fluctuation in vehicle height.

  (3) The height H between the coils 13a and 23a is calculated based on the power source side specific information regarding the position of the power transmitter 13 in the vehicle height direction and the vehicle side specific information regarding the position of the power receiver 23 in the vehicle height direction. Whether or not the height H is within the allowable range is determined, and when the height H is out of the allowable range, the output of the high frequency power from the high frequency power supply 12 is not started. Thereby, it is possible to determine whether or not the ground side device 11 and the vehicle side device 21 are not suitable for power transmission, and power between the ground side device 11 and the vehicle side device 21 that is not suitable for power transmission. Transmission can be avoided.

  In particular, by adopting a configuration for calculating the height H between the coils 13a and 23a using each unique information, the ground-side device 11 and the vehicle-side device 21 of this time can be obtained without considering the variation in the vehicle height. It is possible to determine whether or not the combination is suitable for power transmission. Thereby, power transmission in a combination that is not suitable for power transmission can be suitably avoided.

  More specifically, for example, when calculating the height H between the coils 13a, 23a based on the detection information of the vehicle height detection unit 27, and determining whether to start power transmission based on the calculation result, Depending on the vehicle height, there is a case where power transmission is started even though the combination is not suitable for power transmission. In this case, the height H between the coils 13a and 23a tends to be outside the allowable range due to the fluctuation of the vehicle height during charging of the vehicle battery 22. On the other hand, according to this embodiment, since it is possible to exclude an element of fluctuation in vehicle height in the determination of whether to start power transmission, the ground side device 11 and the vehicle side device 21 this time Thus, it is possible to improve the accuracy of the determination as to whether or not the combination is suitable for power transmission. Thereby, it is possible to avoid a situation in which power transmission is started despite the combination not suitable for power transmission as described above.

  In addition, the combination unsuitable for electric power transmission considers the combination of the vehicle C with comparatively high vehicle height, and the ground side apparatus 11 with which the primary side coil 13a (power transmission device 13) is buried in the ground etc., for example. It is done.

(Second Embodiment)
As shown in FIG. 4, in the present embodiment, the vehicle height detection unit 27 is provided in the ground side device 11. The vehicle height detection unit 27 detects the height (vehicle height) of the vehicle C disposed above the power transmitter 13 and transmits the detection result to the power supply side controller 14.

  Correspondingly, the charging processes executed by the controllers 14 and 26 are different. The different points will be described below. For convenience of explanation, the power supply side charging process is first described, and then the vehicle side charging process is described.

  As shown in FIG. 5, in the power supply side charging process, first, the process waits until the vehicle side specific information is received in step S <b> 301. When the vehicle-side specific information is received, the height H between the coils 13a and 23a is calculated in step S302, and the calculated height H is in an allowable range (Hmin to Hmax) in step S303. It is determined whether or not it is inside.

  If the calculated height H is out of the allowable range, the power source side charging process is terminated as it is. If the calculated height H is within the allowable range, the process proceeds to step S304, and the high frequency The high frequency power supply 12 is controlled so that high frequency power is output from the power supply 12. Thereby, the vehicle battery 22 is charged.

  Thereafter, the detection information of the vehicle height detection unit 27 is acquired in step S305, and the height H between the coils 13a and 23a is calculated in step S306. Then, it is determined whether or not the height H calculated in step S307 is within the allowable range. If it is within the allowable range, it is determined whether or not a power OFF command is received in step S308. If the power OFF command has not been received, the process returns to step S305.

  If it is determined in step S307 that the height H is outside the allowable range, or if a power OFF command is received in step S308, the output of the high frequency power output from the high frequency power supply 12 in step S309. The output of the high frequency power supply 12 is limited so that the power supply is stopped, and the power supply side charging process is terminated. Thereby, charging of the battery 22 for vehicles is complete | finished.

  Next, the vehicle side charging process executed by the vehicle side controller 26 will be described. As shown in FIG. 6, in the vehicle-side charging process, first, vehicle-side unique information is transmitted in step S401. Then, it waits until a charge state will be in a charge completion state in step S402.

When the charging state becomes the charging completion state, the process proceeds to step S403, a power OFF command is transmitted to the power source side controller 14, and the vehicle side charging process is ended.
Next, the operation of this embodiment will be described.

  Based on the height H between the coils 13a and 23a, it is determined whether or not high-frequency power output from the high-frequency power source 12 is started and whether or not high-frequency power output is continued. In particular, a vehicle height detection unit 27 is provided in the ground-side device 11, and correspondingly, whether or not the height H between the coils 13 a and 23 a is within an allowable range during charging of the vehicle battery 22. Are determined in the power supply side charging process. For this reason, it is not necessary to transmit the detection information of the vehicle height detection unit 27 to the vehicle-side controller 26.

According to this embodiment explained in full detail above, in the structure by which the vehicle height detection part 27 is provided in the ground side apparatus 11, the effect shown to said (1)-(3) can be show | played.
In addition, you may change the said embodiment as follows.

  In the embodiment, the high-frequency power source 12 is controlled so that the output of the high-frequency power is stopped when the height H of each of the coils 13a and 23a is out of the allowable range in the situation where the high-frequency power is being output. Although it was the structure, it is not restricted to this, The structure controlled so that the electric power value of high frequency electric power may become small may be sufficient. Even in this case, the abnormality of the high-frequency power source 12 can be avoided.

  In the embodiment, the height H between the coils 13a and 23a is calculated based on each unique information. However, the present invention is not limited to this. For example, the power supply side unique information may be omitted. In this case, since the fluctuation range of the height of the primary side coil 13a is assumed to be relatively narrower than the fluctuation range of the secondary side coil 23a, the height between the coils 13a and 23a is determined only by the vehicle side specific information. Even if the height H is calculated, the amount of deviation between the calculated height H between the coils 13a and 23a and the actual height H between the coils 13a and 23a tends to be small.

  In addition, instead of the height H between the coils 13a and 23a, the high frequency power supply 12 may be controlled based on the vehicle height. In this case, an allowable range may be set corresponding to the vehicle height.

  The vehicle height detection unit 27 may employ an infrared communication transmission unit or an RFID tag, and the ground side device 11 may be provided with an infrared communication reception unit or an RFID reader. In this case, the vehicle height may be estimated based on the received signal strength. Moreover, the ground side apparatus 11 may be a transmission side, and the vehicle side apparatus 21 may be a reception side.

  In the embodiment, an allowable range (hereinafter also referred to as a first allowable range) at the time of determining whether or not to start output of high-frequency power from the high-frequency power source 12 (hereinafter also referred to as a first allowable range), Although the allowable range (hereinafter also referred to as the second allowable range) at the time of determining whether to continue outputting power (step S107 or the like) is the same, it is not limited to this. It is good also as a structure which makes a 1st tolerance | permissible_range different from a 2nd tolerance | permissible_range. For example, the second allowable range may be set narrower than the first allowable range, or vice versa.

  In the embodiment, the upper limit value (Hmax) and the lower limit value (Hmin) are both set as the allowable range. However, the present invention is not limited to this, and only one of them is set. It may be an acceptable range.

  In the embodiment, the allowable range (Hmin to Hmax) is determined in advance so that the voltage or current in the high-frequency power source 12 does not exceed the allowable value, and the transmission efficiency between the power transmitter 13 and the power receiver 23 is predetermined. Although it has been set so as to exceed the minimum efficiency, the present invention is not limited to this. For example, it may be set without considering the transmission efficiency. In short, the allowable range may be set so that no abnormality occurs in the high-frequency power supply 12.

  In the embodiment, the height H between the coils 13a and 23a calculated from the specific information is used when determining whether or not to start the output of the high frequency power from the high frequency power supply 12. For example, the height H between the coils 13a and 23a calculated based on the detection information of the vehicle height detection unit 27 may be used. In this case, each unique information may be omitted.

  In the embodiment, based on the height H between the coils 13a and 23a, the start control of the output of the high frequency power from the high frequency power supply 12 and the continuous control of the output of the high frequency power during the output of the high frequency power are executed. Although it was a structure, you may abbreviate | omit any one. For example, the continuous control of the output of the high frequency power during the output of the high frequency power based on the height H between the coils 13a and 23a may be omitted. In this case, the vehicle height detection unit 27 may be omitted. Thereby, simplification of a structure can be achieved.

  ○ In the case where a negative determination is made in step S103 of the vehicle side charging process, an end command may be transmitted to end the vehicle side charging process. In this case, in step S202 of the power supply side charging process, it is determined whether the power supply ON command or the termination command is received, and when the termination command is received, the power supply side charging process is terminated. .

In the embodiment, the resonance frequency of the power transmitter 13 and the resonance frequency of the power receiver 23 are set to be the same. However, the present invention is not limited to this, and they may be different within a range where power transmission is possible.
In embodiment, although the power transmission device 13 and the power receiving device 23 were the same structures, it is not restricted to this, A different structure may be sufficient.

In the embodiment, the capacitors 13b and 23b are provided, but these may be omitted. In this case, magnetic field resonance is performed using the parasitic capacitances of the coils 13a and 23a.
In the embodiment, magnetic field resonance is used in order to realize non-contact power transmission. However, the present invention is not limited to this, and electromagnetic induction may be used.

In the embodiment, the high-frequency power received by the power receiver 23 is used for charging the vehicle battery 22, but is not limited thereto, and may be used for driving another device, for example.
The high frequency power supply 12 may be any of a power source, a voltage source, and a current source.

A DC / DC converter that converts the voltage of the DC power rectified by the rectifier 24 may be provided between the rectifier 24 and the vehicle battery 22.
The power transmitter 13 may have a configuration including a resonance circuit including a primary side coil 13a and a primary side capacitor 13b, and a primary side coupling coil that is coupled to the resonance circuit by electromagnetic induction. Similarly, the power receiver 23 may include a resonance circuit including a secondary coil 23a and a secondary capacitor 23b, and a secondary coupling coil coupled to the resonance circuit by electromagnetic induction.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) The voltage or current in the AC power supply varies according to the distance in the vehicle height direction between the primary coil and the secondary coil,
The power transmission device according to claim 2 or 3, wherein the allowable range is set such that a voltage or current in the AC power supply does not exceed a predetermined allowable value.

  DESCRIPTION OF SYMBOLS 10 ... Non-contact electric power transmission apparatus, 11 ... Ground side apparatus (power transmission apparatus), 13a ... Primary side coil, 14 ... Power source side controller, 21 ... Vehicle side apparatus (power receiving apparatus), 23a ... Secondary side coil, 26 ... Vehicle-side controller, 27... Vehicle height detection unit.

Claims (4)

AC power supply capable of outputting AC power,
A primary coil to which the AC power is input;
In a power transmission device capable of transmitting the AC power in a non-contact manner with respect to a secondary coil of a power receiving device mounted on a vehicle,
The primary coil is arranged to face at least a part of the secondary coil in the vehicle height direction of the vehicle,
The AC power supply may be configured such that an output of the AC power can be limited based on distance information in the vehicle height direction between the primary side coil and the secondary side coil.   In the situation where the AC power supply is outputting the AC power, it is specified that the distance in the vehicle height direction between the primary side coil and the secondary side coil has deviated from a predetermined allowable range. In such a case, the power transmission device according to claim 1, wherein the output of the AC power is stopped or the power value of the AC power is controlled to be small. The distance information is information related to the vehicle height of the vehicle, and includes predetermined specific information,
In the case where it is specified that the distance in the vehicle height direction between the primary side coil and the secondary side coil is out of a predetermined allowable range based on the unique information, the AC power source is The power transmission device according to claim 1 or 2, wherein start of output of the AC power is prohibited. The power transmission device according to any one of claims 1 to 3,
The power receiving device;
A non-contact power transmission device.