JP2015089164A - Non-contact power transmission system and power reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power transmission system capable of preferably grasping a primary coil, transmitting power to a secondary coil to which power is transmitted this time, out of a plurality of primary coils, and to provide a power reception device.SOLUTION: A non-contact power transmission system 10 includes a power transmission device 11 having a plurality of primary coils 31-33 to which AC power is inputted, and a power reception device 12 having a secondary coil 41 capable of receiving AC power from any one of the primary coils 31-33 in non-contact, and a measurement section 44 for measuring the AC power received by the secondary coil 41. The vehicle controller 45 of the power reception device 12 determines the input pattern of AC power so that a first AC power and a second AC power are inputted to respective primary coils 31-33 at different timing.

Description

  The present invention relates to a contactless power transmission system and a power receiving apparatus.

  As a non-contact power transmission system that does not use a power cord or a power transmission cable, for example, a power transmission device having a primary coil to which AC power is input and a secondary side that can receive AC power in a non-contact manner from the primary coil What is provided with the power receiving apparatus which has a coil is known (for example, refer patent document 1). In such a non-contact power transmission system, for example, AC power is transmitted from the power transmission device to the power reception device in a non-contact manner by causing magnetic resonance between the primary coil and the secondary coil. The AC power received by the power receiving device is used, for example, for charging a vehicle battery of a vehicle on which the power receiving device is mounted.

JP 2009-106136 A

  Here, in a place where a plurality of vehicles can be parked, such as a parking lot of a public facility, it may be desirable to provide a plurality of primary coils. In this case, among the plurality of primary side coils, it is necessary to grasp the primary side coil that transmits power to the secondary side coil to be transmitted this time.

  The object of the present invention has been made in view of the above-described circumstances, and among the plurality of primary side coils, the primary side coil that transmits power to the secondary side coil to be transmitted this time can be properly grasped. A contactless power transmission system and a power receiving device are provided.

  The contactless power transmission system that achieves the above object includes at least one power transmission device having one or a plurality of primary coils to which AC power is input, and the AC that is input to the primary coil. A secondary coil capable of receiving power in a contactless manner, and a power receiving device having a measurement unit that measures AC power received by the secondary coil as received power or DC power converted from the AC power. The power receiving device grasps the primary coil and, when a plurality of primary coils are grasped, a first power value as the AC power for each of the plurality of primary coils. The first AC power and the second AC power of the second power value are input at different timings, and the ratio between the first power value and the second power value is different for each primary coil. A power receiving side control unit that determines an input pattern of the AC power to the plurality of primary coils and transmits information related to the determination result to the power transmission device, and the power transmission device responds to the information related to the determination result. A power transmission side control unit that controls the AC power input to the primary coil so that the AC power is input with the AC power input pattern, and the non-contact power transmission system includes: A calculating unit that calculates a ratio between a power value of the received power corresponding to the first AC power and a power value of the received power corresponding to the second AC power based on a measurement result; 1 is transmitted to the secondary coil based on the calculation result and the ratio of the first power value and the second power value individually determined for each of the plurality of primary coils. Next And identifies the coil.

  According to such a configuration, when a plurality of primary coils are grasped in the power receiving side control unit of the power receiving apparatus, the first AC power and the second AC power are different at different timings for each primary coil. Entered. In this case, the ratio between the first power value that is the power value of the first AC power and the second power value that is the power value of the second AC power is different for each primary coil. Thereby, variation occurs in the ratio of the power values of each received power calculated from the measurement result of the measurement unit according to each primary coil. Therefore, based on the ratio of the power value of each received power and the ratio of the first power value and the second power value determined for each primary coil, the primary power transmitted to the secondary coil. The side coil can be specified.

  In particular, the ratio of the power value of each received power is less likely to fluctuate even when the relative position of the primary side coil and the secondary side coil fluctuates. Thus, by specifying the primary coil that transmits power to the secondary coil using the above ratio, it is possible to suppress a decrease in accuracy due to the relative position fluctuation or the like, and to transmit power to the secondary coil. The side coil can be accurately identified.

  Note that “when a plurality of the primary side coils are grasped” means that there is one power transmission device and the power transmission device includes a plurality of primary side coils, or one primary side coil. This includes cases where there are multiple power transmission devices.

  About the said non-contact electric power transmission system, it is good to set the input start timing of the said alternating current power with respect to these primary side coils so that it may become the same. According to such a configuration, since the input start timing of AC power to each primary coil is set to be the same, compared to the configuration in which the input start timing of AC power to each primary coil is different, While ensuring the input time of AC power in each primary coil for a predetermined time or more, the time until the input of AC power to all the primary coils can be shortened. Moreover, even if the input start timing of AC power to each primary side coil is the same, if the ratio between the first power value and the second power value differs for each primary side coil, The primary coil to transmit power can be specified. Therefore, it is possible to shorten the time until the input of AC power to each primary coil is completed while identifying the primary coil that transmits power to the secondary coil.

  For the non-contact power transmission system, the total input time including both the input time of the first AC power and the input time of the second AC power is set to be the same for the plurality of primary coils. It is good to be. According to such a configuration, since the total input time of AC power is set to be the same for each primary coil, each configuration is different from the configuration in which the total input time of each primary coil is different. While ensuring the input time of AC power in the primary side coil for a predetermined time or more, the time required to complete the input of AC power to all the primary side coils can be shortened. Moreover, even if the total input time with respect to each primary side coil is the same, if the ratio between the first power value and the second power value is different for each primary side coil, power is transmitted to the secondary side coil 1 The secondary coil can be specified. Therefore, it is possible to shorten the time until the input of AC power to each primary coil is completed while identifying the primary coil that transmits power to the secondary coil.

  In the non-contact power transmission system, the first power value is set to be the same for the plurality of primary coils, while the second power value is different for each primary coil. It should be set. According to this configuration, the first power value is set to be the same for each primary coil, while the second power value is different for each primary coil. Thereby, the ratio of the 1st electric power value and the 2nd electric power value will differ for every primary side coil. Therefore, it is possible to facilitate the setting of the ratio as compared with a configuration in which both the first power value and the second power value are different.

  The power receiving device that achieves the above object is capable of receiving the AC power in a non-contact manner from a power transmitting device having a primary coil to which AC power is input, and the AC that is input to the primary coil. A secondary coil capable of receiving power in a non-contact manner, a measurement unit for measuring AC power received by the secondary coil as received power or DC power converted from the AC power, and the primary coil And when the plurality of primary coils are grasped, the first power value of the first power value and the second power value as the AC power for each of the plurality of primary coils. The AC for the plurality of primary side coils is input so that the second AC power is different from each other and the ratio between the first power value and the second power value is different for each primary side coil. Power on A power receiving side control unit that determines a pattern and instructs the power transmission device to input the AC power with the determined input pattern, and the power receiving side control unit is based on a measurement result of the measurement unit A calculating unit that calculates a ratio between the power value of the received power corresponding to the first AC power and the power value of the received power corresponding to the second AC power, and the power receiving side control unit includes: Based on the calculation result of the calculation unit and the ratio of the first power value and the second power value individually set for each of the plurality of primary coils, the secondary coil A primary coil to be transmitted is specified.

  According to such a configuration, when a plurality of primary coils are grasped in the power receiving side control unit of the power receiving apparatus, the first AC power and the second AC power are different from each other for each primary coil. The input pattern of AC power to each primary coil is determined so as to be input at. In this case, the ratio between the first power value that is the power value of the first AC power and the second power value that is the power value of the second AC power is different for each primary coil. Thereby, variation occurs in the ratio of the power values of each received power calculated from the measurement result of the measurement unit according to each primary coil. Therefore, based on the ratio of the power value of each received power and the ratio of the first power value and the second power value determined for each primary coil, the primary power transmitted to the secondary coil. The side coil can be specified.

  In particular, the ratio of the power value of each received power is less likely to fluctuate even when the relative position of the primary side coil and the secondary side coil fluctuates. Thus, by specifying the primary coil that transmits power to the secondary coil using the above ratio, it is possible to suppress a decrease in accuracy due to the relative position fluctuation or the like, and to transmit power to the secondary coil. The side coil can be accurately identified.

  According to this invention, the primary side coil which transmits electric power to the secondary side coil of this time electric power transmission object among several primary side coils can be grasped | ascertained suitably.

The perspective view which shows the outline | summary of a non-contact electric power transmission system typically. The block diagram which shows the electric constitution of a non-contact electric power transmission system. The flowchart which shows a pairing process. The schematic diagram for demonstrating a pairing process. The conceptual diagram for demonstrating a list. (A)-(f) is a timing chart which shows the input pattern of the alternating current power input into each primary side coil, (g) is a timing chart which shows the received power which is a measurement result of a measurement part. The perspective view which shows the outline | summary of the power transmission apparatus of another example typically.

Hereinafter, embodiments of the non-contact power transmission system will be described.
As shown in FIG. 1, the contactless power transmission system 10 includes a power transmission device 11 (charging station) and a power reception device 12 (vehicle side device) that can transmit power without contact. The power transmission device 11 is installed in the vicinity of a plurality of parking spaces S1 to S3 in which the vehicle C can be parked. The power receiving device 12 is mounted on the vehicle C. In the present embodiment, it is assumed that a plurality of power transmission devices 11 are installed.

  As illustrated in FIG. 2, the power transmission device 11 includes a plurality of power supply units 21 to 23 that can output alternating-current power having a predetermined frequency. Each of the power supply units 21 to 23 converts system power input from a system power supply E as infrastructure to AC power, and outputs the converted AC power.

  The power transmission device 11 includes a power controller 24 as a power transmission side control unit that performs various controls of the power transmission device 11 and a communication unit 25 for performing wireless communication. The power controller 24 can wirelessly communicate via the communication unit 25.

  As shown in FIG.1 and FIG.2, the power transmission apparatus 11 is provided with the some primary side coil (power transmission part) 31-33 into which the alternating current power output from the power supply parts 21-23 is input. Specifically, AC power from the first power supply unit 21 is input to the first primary coil 31, and AC power from the second power supply unit 22 is input to the second primary coil 32. Then, AC power from the third power supply unit 23 is input to the third primary coil 33.

  Here, as shown in FIG. 1, each of the primary side coils 31 to 33 is disposed in each of the parking spaces S <b> 1 to S <b> 3. Specifically, the first primary coil 31 is arranged in the first parking space S1, the second primary coil 32 is arranged in the second parking space S2, and the third primary side is arranged. The coil 33 is disposed in the third parking space S3.

  The power receiving device 12 includes a secondary coil (power receiving unit) 41 capable of receiving AC power from any one of the primary coils 31 to 33 in a non-contact manner. Any of the primary side coils 31 to 33 and the secondary side coil 41 are configured to be capable of magnetic field resonance. For example, a primary side capacitor (not shown) is connected to each primary side coil 31 to 33 in series or in parallel, and a resonance circuit is formed. Similarly, a secondary capacitor (not shown) is connected to the secondary coil 41 in series or in parallel to form a resonance circuit. The resonant frequencies of both resonant circuits are set to be the same.

  According to such a configuration, in a situation where the secondary side coil 41 is disposed at a position where any of the primary side coils 31 to 33 can magnetically resonate, AC power is supplied to the primary side coil capable of magnetic field resonance. When input, the resonance circuit including the primary side coil and the resonance circuit including the secondary side coil 41 magnetically resonate. Thereby, the secondary coil 41 receives AC power from the primary coil in a non-contact manner. Note that the frequency of the AC power output from each of the power supply units 21 to 23 may be set to be the same as or close to the resonance frequency of each of the resonance circuits.

  As shown in FIG. 1, the secondary coil 41 is disposed at a position where it can be opposed to any one of the primary coils 31 to 33, specifically at the bottom of the vehicle C. When the vehicle C is parked in any of the parking spaces S1 to S3, the secondary coil 41 faces the primary coil installed in the parked parking space, and the primary coil Magnetic field resonance is possible.

  As illustrated in FIG. 2, the power receiving device 12 includes a rectifier 42 serving as an AC / DC converter that converts (rectifies) AC power received by the secondary coil 41 into DC power, and DC power from the rectifier 42 An input vehicle battery 43 is provided. Thereby, the vehicle battery 43 is charged.

  In addition, the power receiving device 12 includes a measuring unit 44 that measures AC power received by the secondary coil 41. The measurement unit 44 transmits the measurement result to the vehicle controller 45 serving as a power reception side control unit provided in the power reception device 12. Thereby, the vehicle controller 45 can grasp | ascertain received electric power.

  In addition, the power receiving device 12 includes a communication unit 46 for performing wireless communication, and the vehicle controller 45 can perform wireless communication via the communication unit 46 in the same manner as the power supply controller 24. For this reason, the controllers 24 and 45 may be capable of wireless communication with each other.

  In addition, the wireless communicable range of each controller 24 and 45 (each communication part 25 and 46) is set wider than the range which match | combined each parking space S1-S3 which the one power transmission apparatus 11 manages. For this reason, when a plurality of power transmission devices 11 are installed, the plurality of power transmission devices 11 are included in the wireless communicable range of the vehicle controller 45. That is, the vehicle controller 45 can wirelessly communicate with the power supply controllers 24 of the plurality of power transmission devices 11.

  Here, each of the power supply units 21 to 23 can individually switch on / off of the output of the AC power, and can change the power value (at least one of the voltage value and the current value) of the output AC power. is there. For this reason, each power supply part 21-23 can change the input pattern of the alternating current power input into each primary side coil 31-33, respectively. And the power supply controller 24 makes each input pattern of the alternating current power input into each primary side coils 31-33 differ by controlling each power supply parts 21-23 individually, respectively.

  Incidentally, the AC power input pattern includes AC power input time, input start timing, input end timing, AC power value, and the like. In addition, the input pattern of the alternating current power input into each primary side coil 31-33 can also be said to be the output pattern of the alternating current power output from each power supply parts 21-23.

  The non-contact power transmission system 10 exchanges information between the controllers 24 and 45 via the communication units 25 and 46, so that the primary coil that transmits power to the secondary coil 41 to be transmitted this time is transmitted. The pairing process for identifying and pairing the primary side coil and the secondary side coil 41 is executed. The pairing process will be described with reference to the flowchart of FIG.

  The pairing is to establish (authenticate) a combination of the secondary coil 41 and the primary coil that transmits power to the secondary coil 41 in a non-contact manner. In other words, pairing means that both the power supply controller 24 and the vehicle controller 45 grasp (confirm) the combination of the primary side coil and the secondary side coil 41 that performs power transmission.

  Here, for convenience of explanation, in the present embodiment, it is assumed that the vehicle controller 45 can wirelessly communicate with the power supply controllers 24 of the two power transmission apparatuses 11 as shown in FIG. In this case, in order to distinguish between the two, for convenience, one power transmission device 11 is referred to as a first power transmission device 11a, and the other power transmission device 11 is referred to as a second power transmission device 11b. In this case, the power supply controller 24 of the first power transmission device 11a is a first power supply controller 24a, and the power supply controller 24 of the second power transmission device 11b is a second power supply controller 24b. In the pairing process, the vehicle controller 45 and the power supply controllers 24a and 24b perform various processes in parallel while exchanging information with each other.

  Incidentally, as shown in FIG. 4, in the present embodiment, as an example, the vehicle C in which the secondary coil 41 to be transmitted this time is mounted on the second primary coil 32 of the first power transmission device 11a. Is arranged.

  As shown in FIG. 3, first, in step S101, the vehicle controller 45 searches for a power supply controller 24 capable of wireless communication. Specifically, the vehicle controller 45 transmits a response request signal by broadcast to a range where wireless communication is possible as a predetermined range.

  When the first power supply controller 24a receives the response request signal, in step S102, the first power supply controller 24a transmits primary side coil information, which is information related to the primary side coils 31 to 33, as a search response. Specifically, the primary coil information includes first identification information Sa (see FIG. 5) that is identification information of the first power transmission device 11a, and identification information CL1 to CL3 of the primary coils 31 to 33 (see FIG. 5). 5).

  Similarly, when receiving the response request signal, the second power supply controller 24b transmits the primary side coil information as a search response in step S103. Specifically, the primary side coil information includes second identification information Sb (see FIG. 5) that is identification information of the second power transmission device 11b, and identification information CL1 to CL3 of the primary side coils 31 to 33 (see FIG. 5). 5).

  The vehicle controller 45 receives the primary side coil information from each of the power supply controllers 24a and 24b, thereby grasping each of the power transmission devices 11a and 11b, and the primary side coils 31 to 33 of the power transmission devices 11a and 11b. To grasp. That is, the vehicle controller 45 grasps the primary side coils (a total of six) of the power transmission devices 11a and 11b that exist within the wireless communicable range.

  And vehicle controller 45 creates list 50 of primary side coils 31-33 of each power transmission equipment 11a and 11b based on each primary side coil information in Step S104. For example, as illustrated in FIG. 5, identification information Sa and Sb of the power transmission apparatuses 11 a and 11 b and identification information CL <b> 1 to CL <b> 3 of the primary side coils 31 to 33 are set in the list 50. Specifically, in the list 50, identification information CL1 to CL3 of the primary side coils 31 to 33 is set for the identification information Sa of the first power transmission device 11a. In the list 50, identification information CL1 to CL3 of the primary side coils 31 to 33 is set for the identification information Sb of the second power transmission device 11b.

  In continuing step S105, the vehicle controller 45 determines the input pattern of the alternating current power with respect to the primary side coils 31-33 of each power transmission apparatus 11a, 11b. In this case, when a plurality of primary coils are grasped (specifically, when there are a plurality of primary coils in the created list 50), the vehicle controller 45 performs the first AC for each primary coil. An input pattern of AC power is determined so that the power and the second AC power are input at different timings. Specifically, the vehicle controller 45 receives the first AC power to the primary coils 31 to 33 of the power transmission devices 11a and 11b, and at a timing later than the input start timing of the first AC power. An input pattern of AC power is determined so that the second AC power is input.

  Here, the vehicle controller 45 has a ratio (hereinafter referred to as a power transmission ratio) between the first power value P1 that is the power value of the first AC power and the second power value P2 that is the power value of the second AC power. It determines so that it may differ for every primary side coils 31-33 of the power transmission apparatus 11a, 11b. Specifically, the vehicle controller 45 determines different power transmission ratios R1 to R6 for the primary side coils 31 to 33 (total of six primary side coils) of the power transmission devices 11a and 11b. The primary coils 31 to 33 of the devices 11a and 11b and the power transmission ratios R1 to R6 are set in association with each other in the list 50 (see FIG. 5). In this case, the 1st electric power value P1 is determined equally with respect to the primary side coils 31-33 of each power transmission apparatus 11a, 11b. On the other hand, the second power value P2 differs depending on the primary side coils 31 to 33 of the power transmission apparatuses 11a and 11b because of the relationship determined according to the power transmission ratios R1 to R6.

  Each second power value P <b> 2 only needs to be different enough to be discriminated by the measurement unit 44. In the present embodiment, each second power value P2 is set smaller than the first power value P1. In this case, each 2nd electric power value P2 is set larger than the value which the measurement part 44 can measure. Moreover, if it demonstrates just in case, it can be said that power transmission ratio R1-R6 is a voltage ratio and an electric current ratio.

  Incidentally, the vehicle controller 45 inputs the AC power so that both the input start timing of the first AC power and the total input time of the AC power to the primary coils 31 to 33 of the power transmission devices 11a and 11b are the same. Determine the pattern. Note that the total input time of AC power is a time obtained by combining both the input time of the first AC power and the input time of the second AC power. In other words, the vehicle controller 45 applies to the primary coils 31 to 33 of the power transmission apparatuses 11a and 11b so that AC power is input with the same input pattern except for the power transmission ratios R1 to R6 (second power value P2). Determine the AC power input pattern.

  The input time of the first AC power and the input time of the second AC power are set to be longer than the minimum time required for the measurement unit 44 to measure the power value. In the present embodiment, the input time of the first AC power and the input time of the second AC power are set to be the same. However, the present invention is not limited to this, and may be different within the range of the minimum time or more.

  Returning to the description of FIG. 3, the vehicle controller 45 transmits the input pattern information in which the input pattern of the AC power is set to each of the power supply controllers 24a and 24b in step S106 after step S105. The input pattern information includes power transmission ratio information in which the primary coils 31 to 33 and the power transmission ratios R1 to R6 of the power transmission apparatuses 11a and 11b are associated with each other. Specifically, the vehicle controller 45 sends power transmission ratio information in which the identification information CL1 to CL3 and the power transmission ratios R1 to R3 of the primary side coils 31 to 33 of the first power transmission device 11a are associated with the first power supply controller 24a. Send (notify). Then, the vehicle controller 45 transmits the power transmission ratio information in which the identification information CL1 to CL3 of the primary side coils 31 to 33 of the second power transmission device 11b and the power transmission ratios R4 to R6 are associated with each other to the second power supply controller 24b ( Notice.

  In addition, the input pattern information includes the input of the first AC power and the second AC power, and the input time of each AC power, and the series of AC powers excluding the first power value P1 and the second power value P2. Information about the input pattern is set.

  In addition, the vehicle controller 45, when there is one grasped primary side coil, AC power is input so that alternating power of a single predetermined power value is input to the grasped primary side coil. An input pattern of power is determined, and input pattern information in which the determined input pattern is set is transmitted to the primary coil.

  Thereafter, in step S107, the vehicle controller 45 broadcasts an input start request so that AC power is simultaneously input to the primary coils 31 to 33 of the power transmission devices 11a and 11b. Thereby, the 1st power supply controller 24a controls each power supply parts 21-23 simultaneously so that 1st alternating current power may be simultaneously input with respect to each primary side coil 31-33 in step S108. Then, the 1st power supply controller 24a controls each power supply parts 21-23 individually so that the 2nd alternating current power of the 2nd electric power value P2 according to each power transmission ratio R1-R3 is inputted. The first power supply controller 24a receives the second AC power of the second power value P2 corresponding to the power transmission ratio R1 in the first primary coil 31 and corresponds to the power transmission ratio R2 in the second primary coil 32. The second AC power having the second power value P <b> 2 is input, and the second AC power having the second power value P <b> 2 corresponding to the power transmission ratio R <b> 3 is input to the third primary coil 33. To control.

  Moreover, the 2nd power supply controller 24b controls each power supply parts 21-23 simultaneously so that 1st alternating current power may be simultaneously input with respect to each primary side coils 31-33 in step S109. Then, the 2nd power supply controller 24b controls each power supply parts 21-23 individually so that the 2nd alternating current power of the 2nd electric power value P2 according to each power transmission ratio R4-R6 is inputted. In the second power supply controller 24b, the second primary power having the second power value P2 corresponding to the power transmission ratio R4 is input to the first primary coil 31, and the second primary coil 32 corresponds to the power transmission ratio R5. The second AC power having the second power value P <b> 2 is input, and the second AC power having the second power value P <b> 2 corresponding to the power transmission ratio R <b> 6 is input to the third primary coil 33. To control.

  Then, the power supply controllers 24a and 24b are configured so that the input of AC power is simultaneously stopped based on the input of AC power to the primary side coils 31 to 33 over the total input time. By controlling ˜23, the AC power input control is terminated. In addition, if it demonstrates just in case, it can be said that the input control of the alternating current power with respect to each primary side coil 31-33 shown above is output control of the power supply parts 21-23.

  The vehicle controller 45 measures the received power using the measurement unit 44 in step S110 during the period in which the input control of the AC power is performed by the power supply controllers 24a and 24b. Then, the vehicle controller 45 receives the two powers received by the secondary coil 41 based on the measurement result of the measuring unit 44 in step S111 after the AC power input control by the power controllers 24a and 24b is completed. A power reception ratio that is a ratio of power values of AC power is calculated.

  More specifically, when the first AC power and the second AC power are input to the primary side coils 31 to 33 of the power transmission devices 11a and 11b, the secondary side coil 41 changes the first AC power to the first AC power. Corresponding received power (hereinafter referred to as first received power) and received power corresponding to second AC power (hereinafter referred to as second received power) are received. And the measurement part 44 measures each received electric power.

  In such a configuration, the vehicle controller 45 grasps the first received power value Px that is the power value of the first received power and the second received power value Py that is the power value of the second received power. Specifically, the vehicle controller 45 grasps the switching timing at which the first AC power is switched to the second AC power from the AC power input pattern, and grasps the power value of the received power before and after the switching timing. Each received power value Px, Py is grasped. Then, the vehicle controller 45 calculates a power reception ratio (= Py / Px) that is a ratio between the respective power reception values Px and Py.

  In addition, since the input time of the 1st alternating current power with respect to the primary side coils 31-33 of each power transmission apparatus 11a, 11b is respectively the same, the switching timing is the same timing. The power values P1 and P2 and the received power values Px and Py are arbitrary values such as effective values, effective values, and average values.

  In subsequent step S112, the vehicle controller 45 determines whether there is a power transmission ratio R1 to R6 that matches the power reception ratio. When the power reception ratio matches any of the power transmission ratios R1 to R6, the vehicle controller 45 proceeds to step S113, and uses the primary coil input at the power transmission ratio that matches the power reception ratio as the current power transmission target. This is specified as a primary coil (hereinafter referred to as a target coil) that transmits power to the secondary coil 41 (that is, a pairing target).

  Then, the vehicle controller 45 requests | requires a connection to the power supply controller (1st power supply controller 24a in this embodiment) which is managing the object coil in step S114. In step S115, the first power supply controller 24a transmits a connection response signal to the vehicle controller 45 in response to the connection request. Thereby, the secondary coil 41 of the vehicle C and the target coil are paired.

  Thereafter, the vehicle controller 45 and the first power supply controller 24a shift to a charging sequence for charging the vehicle battery 43 while exchanging information with each other. In the charging sequence, the first power supply controller 24a controls the power supply unit connected to the target coil so that AC power for charging is input to the target coil. In this case, the power value of the AC power for charging is larger than the first power value P1 and each second power value P2. That is, the first power value P1 (specifically, the maximum value of the first power value P1) and each second power value P2 (specifically, the maximum value of each second power value P2) used in the pairing process are charged. It is set smaller than the power value of the AC power for use.

  If attention is paid to the transition to the charging sequence after pairing, the pairing (identifying the target coil) means that the power transmission state (the AC power for charging is used for the vehicle battery 43). It can be said that this is a condition for shifting to a state in which charging is performed.

  On the other hand, when the power reception ratio does not match any of the power transmission ratios R1 to R6, the vehicle controller 45 determines that the secondary coil 41 to be transmitted does not exist at a position where power can be received. In this case, the vehicle controller 45 makes a negative determination in step S112, and executes an error handling process in step S116. For example, the vehicle controller 45 notifies that the vehicle C is not arranged at a position where power can be received. Then, after a predetermined time has elapsed, the vehicle controller 45 returns to step S101 and searches again.

  Here, the case where the power reception ratio does not match any of the power transmission ratios R1 to R6 includes the case where the power reception ratio is “0”, that is, the case where the secondary coil 41 cannot receive AC power. .

  Moreover, the case where the secondary side coil 41 of the vehicle C does not exist in a position where power can be received means that, for example, the secondary side coil 41 is arranged at a position away from any of the primary side coils 31 to 33. It is possible that

  Next, the effect | action of this embodiment is demonstrated using FIG. 6 (a) to 6 (f) show input patterns of AC power input to the primary side coils 31 to 33 of the power transmission devices 11a and 11b, and FIG. The received power as a result is shown.

  As shown in FIGS. 6A to 6F, the first AC power is simultaneously input to the primary side coils 31 to 33 of the power transmission apparatuses 11a and 11b at the timing t1. Thereby, as shown in FIG.6 (g), 1st received power is measured. In addition, the 1st electric power value P1 which is an electric power value of 1st alternating current power is the same in each of the primary side coils 31-33 of each power transmission apparatus 11a, 11b.

  As shown in FIGS. 6A to 6F, the primary coils 31 to 33 of the power transmission apparatuses 11a and 11b are simultaneously operated at the timing t2 which is different from the timing t1. 2 AC power is input. In this case, because different power transmission ratios R1 to R6 are set for the primary coils 31 to 33 of the power transmission devices 11a and 11b, the second power value P2 that is the power value of the second AC power is: It differs for each primary side coil 31-33 of each power transmission apparatus 11a, 11b. Note that the timing of t2 is a switching timing at which the first AC power is switched to the second AC power.

  Further, as shown in FIG. 6G, the second received power is measured by inputting the second AC power at the timing t2. Then, the power reception ratio is calculated from the first power reception value Px and the second power reception value Py. The power reception ratio matches the power transmission ratio R2 set for the second primary coil 32 of the first power transmission device 11a. For this reason, the 2nd primary side coil 32 of the 1st power transmission apparatus 11a is specified as an object coil.

According to the embodiment described in detail above, the following excellent effects are obtained.
(1) The vehicle controller 45 of the power receiving apparatus 12 having the secondary side coil 41 grasps the primary side coil existing around the power receiving apparatus 12. When a plurality of primary side coils (specifically, primary side coils 31 to 33 of the power transmission devices 11a and 11b) are grasped, the vehicle controller 45 recognizes the primary side coils 31 of the power transmission devices 11a and 11b. The input pattern of AC power is determined so that the first AC power and the second AC power are input at different timings to each of .about.33. And each power supply controller 24a, 24b controls the alternating current power input into the primary side coils 31-33 of each power transmission apparatus 11a, 11b so that alternating current power is input with the input pattern of the determined alternating current power. Accordingly, the secondary coil 41 receives the first received power corresponding to the first AC power and the second received power corresponding to the second AC power. And the measurement part 44 will measure each received electric power.

  In such a configuration, the vehicle controller 45 varies the power transmission ratios R1 to R6 that are ratios of the first power value P1 and the second power value P2 for the primary side coils 31 to 33 of the power transmission devices 11a and 11b. Thereby, the power reception ratio, which is the ratio between the first power reception and the second power reception, varies according to the primary coils 31 to 33 of the power transmission apparatuses 11a and 11b.

  Then, the vehicle controller 45 calculates a power reception ratio from each of the received power values Px and Py measured by the measurement unit 44, and individually calculates the calculation result and the primary side coils 31 to 33 of the power transmission devices 11a and 11b. Based on the determined power transmission ratios R <b> 1 to R <b> 6, a target coil that is a primary coil that transmits power to the secondary coil 41 is specified. Thereby, it is possible to grasp the target coil while suppressing the complexity of the hardware configuration such as providing a sensor or the like for specifying the position of the vehicle C.

  Moreover, in the input pattern of the alternating current power determined about the primary side coils 31-33 of each power transmission apparatus 11a, 11b, power transmission ratio R1 as a parameter which changes with every primary side coils 31-33 of each power transmission apparatus 11a, 11b ~ R6 is adopted. Thereby, the calculated power reception ratio is different for each of the primary side coils 31 to 33 of the power transmission apparatuses 11a and 11b. The power reception ratio is unlikely to vary with respect to fluctuations in the relative position between the target coil that is transmitting power and the secondary coil 41, fluctuations in the impedance of the vehicle battery 43, and the like. Specifically, for example, when the relative position varies, the transmission efficiency from the target coil to the secondary coil 41 varies, so the first received power value Px and the second received power value Py vary. However, since the degree of fluctuation is the same, the power reception ratio, which is the quotient of the received power values Px and Py, is a value in which fluctuations in transmission efficiency are offset. Then, by specifying the target coil using a power reception ratio that is not easily affected by fluctuations in the relative position as described above, it is possible to suppress a decrease in accuracy related to the identification of the target coil due to the fluctuations in the relative position. The target coil can be specified with high accuracy.

  (2) The input start timing of AC power to the primary side coils 31 to 33 of the power transmission devices 11a and 11b is set to be the same. Specifically, in a configuration in which the second AC power is input after the first AC power is input to the primary side coils 31 to 33 of the power transmission devices 11a and 11b, the power transmission devices 11a and 11b. The input start timings of the first AC power to the primary coils 31 to 33 are set to be the same. Thereby, compared with the structure which changes the input start timing of the alternating current power with respect to the primary side coils 31-33 of each power transmission apparatus 11a, 11b, the alternating current power with respect to the primary side coils 31-33 of each power transmission apparatus 11a, 11b The time required to complete the input can be shortened.

  More specifically, in order to measure each received power value Px, Py using the measurement unit 44, the input time of each AC power is set to be longer than the minimum time necessary for the measurement unit 44 to measure the power value. There is a need. For this reason, the total input time in the primary side coils 31-33 of each power transmission apparatus 11a, 11b needs to be 2 times or more of the said minimum time. Then, even if the total input times are set to be the same (for example, twice the minimum time), the AC power is input to the primary coils 31 to 33 of the power transmission devices 11a and 11b. In the case of a configuration in which the start timing is different, the AC power is input to the primary side coil having the earliest input start timing until the input of AC power to the primary side coil having the latest input start timing is completed. A situation occurs in which the time becomes longer than the total input time.

  On the other hand, in this embodiment, the above situation can be avoided by setting the input start timing of the AC power to the primary side coils 31 to 33 of the power transmission devices 11a and 11b to be the same. The time required to complete the input of AC power to the primary side coils 31 to 33 of the devices 11a and 11b can be shortened.

  Moreover, compared with the structure which changes the input start timing of AC power with respect to the primary side coils 31-33 of each power transmission apparatus 11a, 11b by setting so that the input start timing of AC power may become the same, AC power The input pattern can be easily determined.

  (3) The total input time of AC power is set to be the same for the primary side coils 31 to 33 of the power transmission devices 11a and 11b. Thereby, time until the input of the alternating current power with respect to the primary side coils 31-33 of each power transmission apparatus 11a, 11b can be shortened.

  Specifically, as already described, the total input time needs to be at least twice the minimum time. Under such conditions, if the total input time is varied for each of the primary side coils 31 to 33 of each of the power transmission devices 11a and 11b, the total input of AC power to the primary side coils 31 to 33 of each of the power transmission devices 11a and 11b. Since the time needs to be at least longer than twice the minimum time, the time until the input of AC power to all the primary side coils 31 to 33 of the power transmission apparatuses 11a and 11b is long. Things happen.

  On the other hand, in this embodiment, since the total input time of the alternating current power with respect to the primary side coils 31-33 of each power transmission apparatus 11a, 11b is set equally, respectively, the above total input time is sequentially set. It is possible to avoid the situation that lengthens. Thereby, shortening of time until the input of the alternating current power with respect to all the primary side coils 31-33 of each power transmission apparatus 11a, 11b is completed can be aimed at. In addition, it is possible to facilitate the determination of the AC power input pattern.

  (4) The first power value P1 is set to be the same for the primary coils 31 to 33 of the power transmission devices 11a and 11b, while the second power value P2 is 1 of the power transmission devices 11a and 11b. The secondary coils 31 to 33 are set differently. Thereby, compared with the structure which makes both 1st electric power value P1 and 2nd electric power value P2 differ, each power transmission ratio R1-R6 can be varied comparatively easily.

  (5) The vehicle controller 45 compares the power reception ratio with each of the power transmission ratios R1 to R6. If any of the power transmission ratios R1 to R6 matches the power reception ratio, the vehicle controller 45 matches the power reception ratio. The primary coil corresponding to the power transmission ratio is specified as the target coil. On the other hand, when the power reception ratio does not match any of the power transmission ratios R1 to R6, the vehicle controller 45 determines that the secondary coil 41 does not exist at a position where power can be received. As a result, the secondary coil 41 can be urged to be placed at a position where power can be received, thereby improving convenience.

In addition, you may change the said embodiment as follows.
As shown in FIG. 7, there may be a plurality of power transmission devices 100 each having a primary side coil 31 and a power source unit (not shown) for inputting AC power to the primary side coil 31 one by one. In this case, when the power supply controller 24 of each power transmission device 100 receives a response request signal from the vehicle controller 45, it may transmit its identification information as a search response. And vehicle controller 45 grasps power transmission device 100 based on a search response, and when a plurality of power transmission devices 100 are grasped (when a plurality of types of search responses are received), identification information of each power transmission device 100 is obtained. And a list in which power transmission ratios are associated with each other. And the vehicle controller 45 is good to transmit input pattern information with respect to each power transmission apparatus 100 based on a list | wrist. In this case, the identification information transmitted as the search response corresponds to the primary coil information.

O The number of primary coils may differ between the first power transmission device 11a and the second power transmission device 11b.
In the embodiment, there are a plurality of power transmission apparatuses 11a and 11b, but only one power transmission apparatus 11a and 11b may be provided. Even in this case, the plurality of primary coils 31 to 33 can be grasped. In addition, the number of the primary side coils which one power transmission apparatus has is arbitrary.

  As long as the second power values P2 are different from each other, specific numerical values thereof are arbitrary. For example, each second power value P2 may be set larger than the first power value P1. Further, some of the second power values P2 may be set to be larger than the first power value P1, and others may be set to be smaller than the first power value P1.

  Further, any one of the second power values P2 may be the same as the first power value P1. That is, “1” may be adopted as the power transmission ratio. In other words, if the power transmission ratios are different for each of the plurality of primary coils grasped by the vehicle controller 45, the first power value P1 and the second power value P2 are different even if they are the same. Also good.

  ○ In the process of step S112, it is a configuration in which an affirmative determination is made when any one of the power transmission ratios R1 to R6 matches the power reception ratio, but the present invention is not limited to this. A positive determination may be made. For example, the first allowable range to the sixth allowable range corresponding to the power transmission ratios R1 to R6 are set, it is determined which of the allowable ranges the power reception ratio is included, and the allowable range including the power reception ratio is set. A primary coil to which each AC power is input at a corresponding power transmission ratio may be specified as a target coil. In this case, the allowable ranges may be set so as not to overlap each other.

  In embodiment, although the 1st electric power value P1 with respect to the primary side coils 31-33 of each power transmission apparatus 11a, 11b was set identically, it is not restricted to this, You may vary. In short, the first power value P1 and the second power value P2 may be set so that the power transmission ratios R1 to R6 are different for the primary coils 31 to 33 of the power transmission devices 11a and 11b.

  The vehicle controller 45 is configured to grasp each received power value Px, Py by grasping the power value of the received power before and after the switching timing (timing t2) at which the first AC power is switched to the second AC power. There was, but is not limited to this. For example, the vehicle controller 45 may be configured to grasp the received power values Px and Py by grasping the power values of two received powers having different power values. In this case, the first power value P1 and the second power value P2 may be different.

  The vehicle controller 45 may be configured to transmit only the power transmission ratio instead of the input pattern information as the information related to the determination result of the AC power input pattern. In this case, when the power supply controller 24 receives the power transmission ratio, the first AC power having the first power value P1 is input to each of the primary side coils 31 to 33, and then determined based on the power transmission ratio. Alternatively, the AC power input to the primary coils 31 to 33 may be controlled such that the second AC power having the second power value P2 is input. That is, the vehicle controller 45 may determine at least the power transmission ratio and transmit information regarding the determination result to the power controller 24. In this case, it can be said that the vehicle controller 45 determines the AC power input pattern in cooperation with the power supply controller 24. In other words, the non-contact power transmission system 10 may determine the AC power input pattern as a whole.

  O Parameters (for example, input start timing, input time, etc.) other than the power transmission ratios R1 to R6 in the AC power input pattern may be different for the primary coils 31 to 33 of the power transmission devices 11a and 11b.

  (Circle) the structure which the vehicle controller 45 grasps | ascertains the primary side coil (power transmission apparatus) which exists in the periphery is arbitrary. For example, the power supply controller 24 may periodically transmit a beacon including primary coil information, and the vehicle controller 45 may recognize the primary coil by receiving the beacon.

Although the 1st electric power value P1 and each 2nd electric power value P2 were set smaller than the electric power value of the alternating current power for charge, it is not restricted to this, The same or more may be sufficient.
The measuring unit 44 measures the AC power received by the secondary coil 41 as the received power, but is not limited to this, and the DC power obtained by converting (rectifying) the AC power, that is, for the vehicle The DC power input to the battery 43 may be measured. In short, the received power is AC power received by the secondary coil 41 or DC power converted from the AC power, and the measurement unit 44 measures either the AC power or the DC power. That's fine.

  (Circle) primary side coil information is arbitrary if it is the information regarding the primary side coils 31-33. For example, the power supply controller 24 may be configured to transmit the number information (for example, 3) of the primary side coils 31 to 33 as the primary side coil information. In this case, the vehicle controller 45 determines different power transmission ratios corresponding to the above number, and transmits input pattern information including information on the power transmission ratio. Based on the input pattern information, the power controller 24 controls the input of AC power to the primary coils 31 to 33 and grasps the power transmission ratio to the primary coils 31 to 33. Then, the vehicle controller 45 transmits the power reception ratio to the power controller 24. The power supply controller 24 identifies the target coil by comparing the power reception ratio with each power transmission ratio. In such a configuration, the execution subject of the comparison process (step S112) is the power supply controller 24. That is, the execution subject of the comparison process and the process of specifying the target coil is not limited to the vehicle controller 45 but may be the power supply controller 24.

  The power supply controller 24 may calculate the power reception ratio. In this case, the vehicle controller 45 may transmit the measurement results (reception power values Px and Py) of the measurement unit 44 to the power supply controller 24.

  The list 50 shown in the embodiment is an example, and the specific configuration is arbitrary as long as the primary coils 31 to 33 of the plurality of power transmission apparatuses 11 can be grasped individually. For example, in the case where different identification information is set between the primary side coils 31 to 33 of the first power transmission device 11a and the primary side coils 31 to 33 of the second power transmission device 11b, the power transmission device 11 The identification information Sa and Sb may be omitted.

  In embodiment, although the power supply controller 24 was the structure which performs input control of the alternating current power with respect to the primary side coils 31-33 by performing output control of the power supply parts 21-23, it is not restricted to this. For example, even if each primary side coil 31-33 is connected in parallel with respect to one power supply part, a switching element is provided on each power transmission line which connects a power supply part and each primary side coil 31-33, respectively. Good. And the power supply controller 24 may each vary the input pattern of the alternating current power input with respect to each primary side coils 31-33 by controlling each switching element, respectively. In short, if the input pattern of the AC power input to each of the primary side coils 31 to 33 can be changed, the specific configuration for enabling the change is arbitrary.

(Circle) the resonance frequency of the resonance circuit containing the primary side coils 31-33 and the resonance frequency of the resonance circuit containing the secondary side coil 41 may differ in the range in which electric power transmission is possible.
In the embodiment, the primary side capacitor and the secondary side capacitor are provided. However, the present invention is not limited to this, and these may be omitted. In this case, magnetic resonance may be performed using the parasitic capacitance of each of the coils 31 to 33 and 41.

The AC power received by the secondary coil 41 may be used for purposes other than charging the vehicle battery 43.
O The power receiving device 12 can be mounted on any object, and may be mounted on, for example, a robot or an electric wheelchair.

  The power transmission device 11 may have a configuration including a resonance circuit including the first primary coil 31 and the primary capacitor, and a primary coupling coil coupled to the resonance circuit by electromagnetic induction. The same applies to the second primary coil 32 and the third primary coil 33. The power receiving device 12 may have a configuration including a resonance circuit including the secondary side coil 41 and the secondary side capacitor, and a secondary side coupling coil that is coupled to the resonance circuit by electromagnetic induction.

Next, a preferable example that can be grasped from the embodiment and another example will be described below.
(A) The power receiving side control unit wirelessly transmits a response request signal to the power transmission device arranged in a predetermined range, and power transmission of the power transmission device existing in the range When receiving the response request signal, the side control unit wirelessly transmits primary coil information about the primary coil to the power receiving side control unit, and the power receiving side control unit transmits the primary side coil information to the primary side coil. The non-contact electric power transmission system as described in any one of Claims 1-4 which grasps | ascertains the said primary side coil by receiving coil information.

  (B) In the non-contact power transmission system, the calculation result of the calculation unit and the ratio of the first power value and the second power value individually set for each of the plurality of primary coils And if any of the transmission ratios matches the calculation result of the calculation unit, the primary side corresponding to the transmission ratio that matches the calculation result of the calculation unit When the coil is identified as a primary coil that transmits power to the secondary coil, but the calculation result of the calculation unit does not match any of the power transmission ratios, the secondary coil is placed in a position where power can be received. The non-contact power transmission system according to any one of claims 1 to 4 and (A), which is determined not to exist.

  (C) 2 having at least one power transmission device having one or a plurality of primary coils to which AC power is input, and capable of receiving the AC power input to the primary coil in a non-contact manner 2 A non-contact power transmission system including a secondary coil and a power receiving device having a measurement unit that measures AC power received by the secondary coil as received power or DC power converted from the AC power. The power receiving device includes a power receiving side control unit that grasps the primary side coil, and the non-contact power transmission system is configured such that when a plurality of the primary side coils are grasped by the power receiving side control unit, A first AC power of a first power value and a second AC power of a second power value are input to each of a plurality of primary side coils as the AC power at different timings, and the first power And controlling the input of the AC power to each primary coil so that the ratio between the value and the second power value is different for each primary coil, and further based on the measurement result of the measurement unit A calculation unit that calculates a ratio between a power value of the received power corresponding to the first AC power and a power value of the received power corresponding to the second AC power, and a calculation result of the calculation unit; Based on the ratio between the first power value and the second power value individually set for each of the plurality of primary coils, the primary coil that transmits power to the secondary coil is identified. A non-contact power transmission system.

  DESCRIPTION OF SYMBOLS 10 ... Non-contact electric power transmission system, 11 ... Power transmission apparatus, 11a ... 1st power transmission apparatus, 11b ... 2nd power transmission apparatus, 12 ... Power receiving apparatus, 24 ... Power supply controller, 31-33 ... Primary side coil, 41 ... Secondary Side coil 44... Measuring unit 45. Vehicle controller 50. List C C Vehicle R1 to R6 Power transmission ratio.

Claims (5)

A secondary coil that includes at least one power transmission device having one or more primary coils to which AC power is input and that can receive the AC power input to the primary coil in a non-contact manner. And a non-contact power transmission system including a power receiving device having a measuring unit that measures AC power received by the secondary coil as received power or DC power converted from the AC power,
The power receiving device grasps the primary side coil, and when a plurality of the primary side coils are grasped, the power receiving device has a first power value as the AC power for each of the plurality of primary side coils. The first AC power and the second AC power of the second power value are input at different timings, and the ratio between the first power value and the second power value is different for each primary coil. Determining an input pattern of the AC power to the plurality of primary coils, and including a power receiving side control unit that transmits information on the determination result to the power transmission device;
The power transmission device includes a power transmission side control unit configured to control the AC power input to the primary coil so that the AC power is input with an input pattern of the AC power according to information on the determination result,
The contactless power transmission system includes:
A calculating unit that calculates a ratio between a power value of the received power corresponding to the first AC power and a power value of the received power corresponding to the second AC power based on a measurement result of the measuring unit; Based on the calculation result of the calculation unit and the ratio between the first power value and the second power value determined individually for each of the plurality of primary coils, the secondary coil The non-contact electric power transmission system characterized by specifying the primary side coil which transmits electric power to.   The contactless power transmission system according to claim 1, wherein input start timings of the AC power to the plurality of primary coils are set to be the same.   The total input time that combines both the input time of the first AC power and the input time of the second AC power is set to be the same for the plurality of primary coils. Item 3. The non-contact power transmission system according to Item 2.   The first power value is set to be the same for the plurality of primary coils, while the second power value is set to be different for each primary coil. The contactless power transmission system according to claim 1. In a power receiving device capable of receiving the AC power in a non-contact manner from a power transmitting device having a primary coil to which AC power is input,
A secondary coil capable of receiving the AC power input to the primary coil in a contactless manner;
A measuring unit for measuring AC power received by the secondary coil as received power or DC power converted from the AC power;
While grasping the primary side coil and a plurality of primary side coils, the first alternating current power of the first power value as the alternating current power for each of the plurality of primary side coils The plurality of primary powers so that the second AC power of the second power value is input at different timings and the ratio between the first power value and the second power value is different for each primary coil. Determining the input pattern of the AC power to the side coil, and instructing the power transmission device to input the AC power with the determined input pattern;
With
The power receiving side control unit
A calculating unit that calculates a ratio between a power value of the received power corresponding to the first AC power and a power value of the received power corresponding to the second AC power based on a measurement result of the measuring unit; The power receiving side control unit is based on a calculation result of the calculation unit and a ratio between the first power value and the second power value individually set for each of the plurality of primary coils. Then, a primary side coil that transmits power to the secondary side coil is specified.