JP5737546B2 - Power receiving device, power transmitting device, and power transmission system - Google Patents

Description

  The present invention relates to a power reception device, a power transmission device, and a power transmission system, and particularly relates to a power reception device, a power transmission device, and a power transmission system corresponding to an electric field coupling method.

  An example of an apparatus that transmits electric power by an electric field coupling method is disclosed in Patent Document 1. This device is composed of an energy generating device and a consuming device located at a short distance from each other. The device is also modeled in the form of an interaction between asymmetric oscillating electric dipoles, which consists of a high-voltage high-frequency generator or a high-voltage high-frequency charge placed between two electrodes. These dipoles exert mutual influence on each other. Electrical energy and / or information is transported remotely using a Coulomb field surrounding any collection of charged conductors in a slowly changing variable state.

  An example of a system that performs power transmission by a magnetic field coupling method is disclosed in Patent Document 2. This system is formed by a master unit having a power transmission unit and a slave unit having a power reception unit. The power transmission unit transmits power through an alternating magnetic field based on the output of the power source, and the power reception unit receives the power by converting the alternating magnetic field coming from the outside into an electric quantity.

Special table 2009-531009 JP 2011-44775 A

  However, since completely different principles are adopted between the electric field coupling method and the magnetic field coupling method, if one method is used to cope with either method, the circuit configuration may be complicated.

  Therefore, a main object of the present invention is to provide a power reception device, a power transmission device, and a power transmission system that can cope with both the magnetic field coupling method and the electric field coupling method while suppressing the complexity of the circuit configuration.

  A power receiving device (20: reference numeral corresponding to the embodiment; the same applies hereinafter) according to the present invention receives power transmitted from a power transmitting device (10a, 10b) employing at least one of an electric field coupling method and a magnetic field coupling method. A device having a conductive winding (L4), a conductive plate (E3, E3_1, E3_2), one input terminal (T241, T301, T321) to which an AC voltage is applied and the other input Conversion means (24, 30, 32) having an end (T242, T302, T322) and converting AC voltage to DC voltage, one end of the wound body and the plate-like body at the time of electric field coupling, one input end and the other input First connection means (22) electrically connected to the end, and second connection means (SL1, SL2) for electrically connecting one end and the other end of the wound body to one input end and the other input end at the time of magnetic field coupling ).

  Preferably, the first connecting means is connected to the primary coil (L5) having one end and the other end respectively connected to one end and the plate-like body of the wound body, and to the one input end and the other input end, respectively. The second connection means includes a secondary coil (L6) having one end and the other end and forming a step-down transformer (22) together with the primary coil, and the second connection means connects the first end of the wound body to the one input end. A conductive line (SL1) and a second conductive line (SL2) that connects the other end of the wound body to the other input end are included.

  In one aspect, a first capacitor (C1) provided on the first conductive line is further provided.

  In another aspect, a second capacitor (C2) provided between the first conductive line and the second conductive line is further provided.

  In another aspect, the first switching means (SW1) for switching the connection destination of one end of the wound body between the one end of the primary coil and the first conductive wire, and the connection destination of the other input end of the secondary coil Second switching means (SW2) for switching between the other end and the second conductive line is further provided.

  In still another aspect, the conversion means includes a first voltage conversion means (32) corresponding to the electric field coupling method and a second voltage conversion means (30) corresponding to the magnetic field coupling method, while the input end is the first voltage conversion means (32). A first voltage input terminal (T321) assigned to the voltage conversion means, and a second voltage input terminal (T301) assigned to the second voltage conversion means, the other input terminal being the first voltage conversion terminal. Including a first other voltage input terminal (T322) assigned to the second voltage conversion means and a second other voltage input terminal (T302) assigned to the second voltage conversion means. 1 is connected to one voltage input terminal and the first other voltage input terminal, respectively, and the first conductive line and the second conductive line are respectively connected to the second one voltage input terminal and the second other voltage input terminal.

  More preferably, a third switching means (SW3) for switching the connection destination of one end of the wound body between the one end of the primary coil and the first conductive wire, and a fourth switching means for intermittently connecting the second conductive wire ( SW4) is further provided.

  Preferably, the plate-like body includes a plurality of partial plate-like bodies (E3_1, E3_2).

  A power transmission device (40) according to the present invention is a power transmission device that transmits power to a power receiving device (50a, 50b) that employs at least one of an electric field coupling method and a magnetic field coupling method, and has a conductive winding body (L9). ), A conductive plate-like body (E4, E4_1, E4_2), one output terminal (T421) to which an AC voltage is applied and the other output terminal (T422), and a conversion means for converting a DC voltage into an AC voltage (42) first connection means (44) for electrically connecting one end and a plate-like body of the wound body to one output end and the other output end during electric field coupling, and one end of the wound body during magnetic field coupling; Second connection means (SL3, SL4) for electrically connecting the other end to the one output end and the other output end are provided.

  Preferably, the first connecting means is connected to the primary coil (L7) having one end and the other end connected to the one output end and the other output end, respectively, and to the one end and the plate-like body of the wound body. A secondary coil (L8) having one end and the other end and forming a step-up transformer (44) together with the primary coil, and the second connection means connects the one end of the wound body to the one output end. One conductive line (SL3) and a second conductive line (SL4) connecting the other end of the wound body to the other output end are included.

  In one aspect, a first capacitor (C4) provided on the first conductive line is further provided.

  In another aspect, a second capacitor (C5) provided between the first conductive line and the second conductive line is further provided.

  In other aspects, the first switching means (SW5) for switching the connection destination of one end of the wound body between the one end of the secondary coil and the first conductive line, and the connection destination of the other output end of the primary coil Second switching means (SW6) for switching between the other end and the second conductive line is further provided.

  A power transmission system according to the present invention includes a power transmission device (10a, 10b) that employs at least one of an electric field coupling method and a magnetic field coupling method, and a power reception device (20) that receives power transmitted from the power transmission device. The power receiving device includes a conductive winding body (L4), a conductive plate body (E3, E3_1, E3_2), and an input terminal to which an AC voltage is applied (T241, T301, T321). And the other input end (T242, T302, T322), the conversion means (24, 30, 32) for converting AC voltage to DC voltage, one end of the wound body and the plate-like body at one input end when electric field coupling And a first connection means (22) for electrically connecting to the other input end, and a second connection means for electrically connecting one end and the other end of the wound body to the one input end and the other input end during magnetic field coupling ( SL1, SL2).

  A power transmission system according to the present invention is a power transmission system including a power receiving device (50a, 50b) that employs at least one of an electric field coupling method and a magnetic field coupling method, and a power transmission device (40) that transmits power to the power receiving device. The power transmission device has a conductive winding body (L9), a conductive plate body (E4, E4_1, E4_2), one output terminal (T421) and the other output terminal (T422) to which an AC voltage is applied. Conversion means (42) for converting a DC voltage into an AC voltage, and a first connection means for electrically connecting one end and a plate-like body of the wound body to one output end and the other output end during electric field coupling ( 44) and second connection means (SL3, SL4) for electrically connecting one end and the other end of the wound body to the one output end and the other output end at the time of magnetic field coupling.

  According to this invention, the wound body functions as one electrode for power reception or power transmission during power reception or power transmission according to the electric field coupling method, and also functions as an electromagnetic induction coil during power reception or power transmission according to the magnetic field coupling method. The plate-like body functions as the other electrode for power reception or power transmission during power reception or power transmission according to the electric field coupling method. Thus, complication of a circuit structure can be suppressed by sharing a wound body as an electrode for power reception or power transmission and an electromagnetic induction coil.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

(A) is a block diagram which shows an example of the power transmission apparatus which comprises an electric power transmission system, (B) is a block diagram which shows another example of the electric power transmission apparatus which comprises an electric power transmission system. It is a block diagram which shows an example of the power receiving apparatus which comprises an electric power transmission system. (A) is an illustration figure which shows an example of the connection aspect of the switch at the time of electric field coupling, (B) is an illustration figure which shows an example of the connection aspect of the switch at the time of magnetic field coupling. It is a flowchart which shows a part of operation | movement of the control circuit provided in the power receiving apparatus. (A) is an illustration figure which shows an example of the state which looked at the housing | casing which comprises a power receiving apparatus from upper direction, (B) is an illustration figure which shows another example of the state which looked at the housing | casing which comprises power receiving apparatus from the upper direction. And (C) is an illustrative view showing another example of a state in which the casing forming the power receiving device is viewed from above, and (D) is still another example of the state in which the casing forming the power receiving device is viewed from above. (E) is an illustrative view showing another example of a state in which the casing forming the power receiving device is viewed from above, and (F) is a state in which the casing forming the power receiving device is viewed from above. It is an illustration figure which shows another example of these. It is a block diagram which shows a part of other example of the power receiving apparatus which comprises an electric power transmission system. It is a block diagram which shows a part of other example of the power receiving apparatus which comprises an electric power transmission system. It is a block diagram which shows a part of further another example of the power receiving apparatus which comprises an electric power transmission system. (A) is an illustration figure which shows another example of the state which looked at the housing | casing which comprises a power receiving apparatus from upper direction, (B) shows another example of the state which looked at the housing | casing which comprises power receiving apparatus from the upper direction. FIG. It is a block diagram which shows another example of the power receiving apparatus which comprises an electric power transmission system. It is a circuit diagram which shows an example of a structure of the rectification smoothing circuit which forms the power receiving apparatus shown in FIG. It is an illustration figure which shows an example of the connection aspect of the switch at the time of electric field coupling. It is an illustration figure which shows an example of the connection aspect of a switch at the time of magnetic field coupling. It is a flowchart which shows a part of operation | movement of the control circuit provided in the power receiving apparatus. It is a block diagram which shows a part of other example of the power receiving apparatus which comprises an electric power transmission system. It is a block diagram which shows a part of other example of the power receiving apparatus which comprises an electric power transmission system. It is a block diagram which shows a part of further another example of the power receiving apparatus which comprises an electric power transmission system. It is a block diagram which shows an example of the power transmission apparatus which comprises an electric power transmission system. (A) is a block diagram showing an example of a power receiving device constituting the power transmission system, and (B) is a block diagram showing another example of the power receiving device constituting the power transmission system. (A) is an illustration figure which shows an example of the connection aspect of the switch at the time of electric field coupling, (B) is an illustration figure which shows an example of the connection aspect of the switch at the time of magnetic field coupling. It is a flowchart which shows a part of operation | movement of the control circuit provided in the power transmission apparatus. It is a block diagram which shows a part of other example of the power transmission apparatus which comprises an electric power transmission system. It is a block diagram which shows a part of other example of the power transmission apparatus which comprises an electric power transmission system. It is a block diagram which shows a part of other example of the power transmission apparatus which comprises an electric power transmission system. It is a block diagram which shows another example of the power transmission apparatus which comprises an electric power transmission system. (A) is an illustration figure which shows an example of the connection aspect of the switch at the time of electric field coupling, (B) is an illustration figure which shows an example of the connection aspect of the switch at the time of magnetic field coupling. (A) is an illustration figure which shows an example of the state which looked at the housing | casing which comprises a power transmission apparatus from upper direction, (B) is an illustration figure which shows an example of the state which looked at the housing | casing which comprises a power transmission apparatus from the side. (A) is an illustration figure which shows an example of the state which looked at the housing | casing which comprises the power receiving apparatus which employ | adopts an electric field coupling system from the upper direction, (B) is the housing | casing which comprises the power receiving apparatus which employ | adopts a magnetic coupling system from the upper It is an illustration figure which shows an example of the state seen. It is an illustration figure which shows an example of the state which mounted the power receiving apparatus shown to FIG. 28 (A) in the power transmission apparatus shown to FIG. 27 (A). It is an illustration figure which shows an example of the state which mounted the power receiving apparatus shown to FIG. 28 (B) in the power transmission apparatus shown to FIG. 27 (A). It is an illustration figure which shows another example of the state which looked at the housing | casing which comprises the power transmission apparatus of another Example from upper direction. It is an illustration figure which shows another example of the state which looked at the housing | casing which comprises the power transmission apparatus of another Example from upper direction. It is an illustration figure which shows an example of the state which looked at the housing | casing which comprises the other power receiving apparatus which employ | adopts an electric field coupling system from the upper direction. It is an illustration figure which shows an example of the state which mounted the power receiving apparatus shown in FIG. 33 on the power transmission apparatus shown in FIG.

  The power transmission system of this embodiment is formed by the power transmission device 10a shown in FIG. 1A or the power transmission device 10b shown in FIG. 1B and the power reception device 20 shown in FIG. A power transmission device 10a illustrated in FIG. 1A corresponds to an electric field coupling method, and a power transmission device 10b illustrated in FIG. 1B corresponds to a magnetic field coupling method. The power receiving device 20 shown in FIG. 2 corresponds to both the electric field coupling method and the magnetic field coupling method.

  In the power transmission device 10a illustrated in FIG. 1A, the inverter 12 converts a DC voltage output from the DC power supply Vcc into an AC voltage. The converted AC voltage is applied to the primary coil L1 that forms the step-up transformer 14. The secondary coil L2 has a larger number of turns than the number of turns of the primary coil L1, and forms the step-up transformer 14 together with the primary coil L1. The one end and the other end of the secondary coil L2 are connected to the electric field coupling electrodes E1 and E2, respectively. The AC voltage boosted by the step-up transformer 14 is applied to the electrodes E1 and E2.

  Also in the power transmission device 10b shown in FIG. 1B, the DC voltage output from the DC power supply Vcc is converted into an AC voltage by the inverter 12. However, the converted AC voltage is applied to the electromagnetic induction coil L3 for magnetic field coupling.

  Referring to FIG. 2, switch SW1 has a common terminal T10 and branch terminals T11 and T12, and switch SW2 has a common terminal T20 and branch terminals T21 and T22. One end and the other end of wound body L4 are connected to common terminal T10 of switch SW1 and branch terminal T21 of switch SW2, respectively. Further, the branch terminal T12 and the plate-like electrode E3 of the switch SW1 are connected to one end and the other end of the primary coil L5 that form the step-down transformer L5 together with the secondary coil L6. The secondary coil L6 has a smaller number of turns than the number of turns of the primary coil L5.

  One end of the secondary coil L6 is connected to one input terminal T241 provided in the rectifying and smoothing circuit 24, and the other end of the secondary coil L6 is connected to the branch terminal T22 of the switch SW2. A common terminal T20 of the switch SW2 is connected to the other input terminal T242 provided in the rectifying / smoothing circuit 24. One input terminal T241 of the rectifying / smoothing circuit 24 is also connected to the branch terminal T11 of the switch SW1 via the capacitor C1.

  In the following, the conductive wire connecting the branch terminal T12 and the one input end T241 of the rectifying / smoothing circuit 24 is particularly defined as “SL1”, and the other end of the wound body L4 is connected to the branch terminal T21 of the switch SW2. The conductive line to be defined is particularly defined as “SL2”. The capacitor C1 forms an LC resonance circuit together with the wound body L4, and the resonance frequency of the LC resonance circuit is adjusted to be close to the frequency of the AC voltage generated by the inverter 12.

  Referring to FIG. 3A, at the time of electric field coupling, common terminal T10 of switch SW1 is connected to branch terminal T11, and common terminal T20 of switch SW2 is connected to branch terminal T21. One end of wound body L4 is connected to one end of primary coil L5 forming step-down transformer 22, and the other end of wound body L4 is opened. Further, the other end of the secondary coil L6 constituting the step-down transformer 22 is connected to the other input end T242 of the rectifying and smoothing circuit 24. At this time, the wound body L4 functions as an electric field coupling electrode.

  When the power receiving device 20 is brought close to the power transmitting device 10a, the wound body L4 and the electrode E3 are electrically coupled to the electrodes E1 and E2. As a result, an AC voltage having the same frequency as the AC voltage applied to the electrodes E1 and E2 is excited in the wound body L4 and the electrode E3. The excited AC voltage is applied to one input terminal T241 and the other input terminal T242 of the rectifying and smoothing circuit 24 through the step-down transformer 22.

  Referring to FIG. 3B, at the time of magnetic field coupling, common terminal T10 of switch SW1 is connected to branch terminal T12, and common terminal T20 of switch SW2 is connected to branch terminal T22. One end of the wound body L4 is connected to one input terminal T241 of the rectifying / smoothing circuit 24 via the switch SW1 and the capacitor C1, and the other end of the wound body L4 is connected to the other input terminal of the rectifying / smoothing circuit 24 via the switch SW2. Connected to T242. At this time, the wound body L4 functions as an electromagnetic induction coil for magnetic field coupling.

  When the power receiving device 20 is brought close to the power transmitting device 10b, the wound body L4 is magnetically coupled to the electromagnetic induction coil L3. As a result, an AC voltage having the same frequency as the AC voltage applied to the electromagnetic induction coil L3 is excited in the wound body L4. The excited AC voltage is applied to one input terminal T241 and the other input terminal T242 of the rectifying and smoothing circuit 24.

  The rectifying / smoothing circuit 24 rectifies and smoothes the applied AC voltage to generate a DC voltage, and supplies the generated DC voltage to the charging circuit 26. The charging circuit 26 charges the battery BT based on the supplied DC voltage.

  The DC voltage generated by the rectifying / smoothing circuit 24 is also supplied to the control circuit 28. The control circuit 28 controls the setting of the switches SW1 and SW2 with reference to the supplied DC voltage. Specifically, the control circuit 28 executes processing according to the flowchart shown in FIG.

  First, in step S1, the common terminal T10 of the switch SW1 is connected to the branch terminal T11, and the common terminal T20 of the switch SW2 is connected to the branch terminal T21. In step S3, the voltage value of the DC voltage supplied from the rectifying / smoothing circuit 24 is detected, and in step S5, it is determined whether or not the detected voltage value is equal to or greater than a specified value.

  If the determination result is NO, the connection of the switches SW1 and SW2 is changed in step S7. The connection destination of the common terminal T10 provided in the switch SW1 is changed between the branch terminals T11 and T12, and the connection destination of the common terminal T20 provided in the switch SW2 is changed between the branch terminals T21 and T22. When the change is completed, the process returns to step S3.

  When the common terminal T10 of the switch SW1 is connected to the branch terminal T11 and the common terminal T20 of the switch SW2 is connected to the branch terminal T21, if the determination result in step S5 indicates YES, the power transmission corresponding to the electric field coupling method is performed. It is assumed that the device 10a has been brought close to the power receiving device 20, and power reception according to the electric field coupling method is started.

  On the other hand, when the common terminal T10 of the switch SW1 is connected to the branch terminal T12 and the common terminal T20 of the switch SW2 is connected to the branch terminal T22, if the determination result in step S5 shows YES, the magnetic field coupling It is considered that the power transmission device 10b corresponding to the method is brought closer to the power receiving device 20, and power reception according to the magnetic field coupling method is started.

  Here, the specified value in step S5 may be the same value or a different value between the electric field coupling method and the magnetic field coupling method.

  In the above, the electric field coupling method and the magnetic field coupling method are switched depending on the voltage value after rectification and smoothing. However, a wireless communication is performed by separately providing a transmission side communication circuit and a reception side communication circuit in the power transmission device and the power reception device, respectively. By performing, the electromagnetic coupling method and the magnetic field coupling method may be switched.

  That is, for example, the following is performed.

  The transmission side communication circuit of the electric field coupling type power transmission device transmits the electric field status signal to the reception side communication circuit when receiving the electric field status signal from the reception side communication circuit, and starts transmission when the electric field coupling hold signal is received. Have a function to let you. The transmission side communication circuit of the magnetic field coupling type power transmission device transmits the magnetic field status signal to the reception side communication circuit when receiving the magnetic field status signal from the reception side communication circuit, and starts power transmission when the magnetic field coupling hold signal is received. Have a function to let you.

  When the communication circuit of the power receiving apparatus sends the electric field status signal to the power transmitting apparatus and receives the electric field status signal from the power transmitting apparatus, the power transmitting apparatus 10a corresponding to the electric field coupling method is regarded as being brought closer to the power receiving apparatus 20, and is transmitted to the power transmitting apparatus. An electric field coupling hold signal is transmitted, and power reception according to the electric field coupling method is started. In addition, when the communication circuit of the power receiving device sends an electric field status signal to the power transmitting device and times out, the magnetic field status signal is sent, and when the magnetic field status signal is received from the power transmitting device, the power transmission corresponding to the magnetic field coupling method is performed. Assuming that the device 10b is brought close to the power receiving device 20, a magnetic field coupling hold signal is transmitted to the power transmitting device, and power reception according to the magnetic field coupling method is started. When the communication circuit of the receiving apparatus sends a magnetic field status signal and times out, it repeats from where the electric field status signal is sent.

  The wound body L4 and the electrode E3 are provided in the power receiving device 20 in the mode shown in FIG. According to FIG. 5A, the wound body L4 is formed in a disc shape, and the electrode E3 is formed in a rectangular plate shape. Further, the power receiving device 20 has a rectangular parallelepiped housing RHS. The wound body L4 is provided in the center of the main surface of the housing RHS in a posture in which the winding axis is orthogonal to the main surface of the housing RHS. On the other hand, the electrode E3 is provided at a position on one end side in the length direction of the main surface of the housing RHS so that the orientation of the main surface coincides with the orientation of the main surface of the housing RHS.

  As can be seen from the above description, the power transmission device 10a corresponds to the electric field coupling method, and the power transmission device 10b corresponds to the magnetic field coupling method. The power receiving device 20 receives the power transmitted from the power transmitting device 10a or 10b. In the power receiving device 20, the wound body L4 and the electrode E3 are both conductive. The rectifying / smoothing circuit 24 has one input terminal T241 and the other input terminal T242 to which an AC voltage is applied, and converts the AC voltage into a DC voltage. Step-down transformer 22 electrically connects one end of wound body L4 and electrode E3 to one input end T241 and the other input end T242 during electric field coupling. Conductive lines SL1 and SL2 electrically connect one end and the other end of wound body L4 to one input end T241 and the other input end T242 during magnetic field coupling.

  Thus, wound body L4 functions as one electrode for power reception when receiving power according to the electric field coupling method, and also functions as an electromagnetic induction coil when receiving power according to the magnetic field coupling method. The electrode E3 functions as the other electrode for receiving power when receiving power according to the electric field coupling method. Thus, complication of a circuit structure can be suppressed by sharing the wound body L4 as a receiving electrode and an electromagnetic induction coil.

  Note that the wound body L4 and the electrode E3 may be provided in the power receiving device 20 in the manner shown in FIGS. 5 (B) to 5 (F). According to FIG. 5B, the wound body L4 is provided at a position on one end side in the length direction of the main surface of the housing RHS, and the electrode E3 is provided at the center of the main surface of the housing RHS. According to FIG. 5C, the wound body L4 is provided at a position on one end side in the length direction of the main surface of the housing RHS, and the electrode E3 whose main surface is enlarged is the main surface of the housing RHS. It is provided at a position on the other end side in the length direction from the center of. The modes shown in FIGS. 5D to 5F are the same as FIGS. 5A to 5C except that the shape of the main surface of the wound body L4 is rectangular.

  In the power receiving device 20 shown in FIG. 2, a capacitor C1 is provided on the conductive line SL1. However, a capacitor C2 is added between the conductive lines SL1 and SL2 as shown in FIG. 6, a capacitor C2 is provided instead of the capacitor C1 as shown in FIG. 7, and both the capacitors C1 and C2 are omitted. You may do it.

  Furthermore, in the power receiving device 20 shown in FIG. 2, a single electrode E3 is provided. However, as shown in FIG. 8, the electrode E3 is divided into partial electrodes E3_1 and E3_2, and the partial electrodes E3_1 and E3_2 are provided on the main surface of the housing RHS in the manner shown in FIG. 9A or 9B. It may be. 9A and 9B, the partial electrode E3_1 is provided on one end side in the length direction of the housing RHS, and the partial electrode E3_2 is provided on the other end side in the length direction of the housing RHS. . Note that the wound body L4 is provided at the center of the main surface of the housing RHS in both FIG. 9 (A) and FIG. 9 (B).

  By using the configuration of FIG. 9, there is an advantage that the power transmission device can be arranged in any direction (can be placed in an easy-to-place direction).

  Moreover, according to FIG. 1 (A) and FIG. 1 (B), the power transmission apparatus 10a respond | corresponds only to an electric field coupling system, and the power transmission apparatus 10b respond | corresponds only to a magnetic field coupling system. However, the configurations of the power transmission devices 10a and 10b may be integrated to prepare a power transmission device that supports both the electric field coupling method and the magnetic field coupling method.

  Referring to FIG. 10, power receiving apparatus 10 of another embodiment is provided with rectifying / smoothing circuits 30 and 32 corresponding to the magnetic field coupling method and the electric field coupling method, respectively, instead of rectifying / smoothing circuit 24 shown in FIG. 2 is the same as the rectifying / smoothing circuit 24 shown in FIG. 2 except that a part of the configuration is modified. Therefore, the overlapping description regarding the same configuration is omitted as much as possible.

  According to FIG. 10, the switch SW3 has a common terminal T40, a branch terminal T41 and T42. The rectifying / smoothing circuit 30 has one input end T301 and the other input end T302, and the rectifying / smoothing circuit 32 has one input end T321 and the other input end T322. The common terminal T40 is connected to one end of the wound body L4, the branch terminal T42 is connected to one input end T301 of the rectifying and smoothing circuit 30 via the capacitor C1, and the branch terminal T41 is the primary coil L5 that forms the step-down transformer 22. Is connected to one end.

  The other input end T302 of the rectifying / smoothing circuit 30 is connected to the other end of the wound body L4 via the switch SW4. Further, the one input end T321 and the other input end T322 of the rectifying / smoothing circuit 32 are connected to one end and the other end of the secondary coil L6 forming the step-down transformer 22, respectively.

  In this power receiving device as well, the conductive wire connecting the branch terminal T42 and one input end T301 of the rectifying / smoothing circuit 30 is defined as “SL1”, and the other end of the wound body L4 and the other input of the rectifying / smoothing circuit 30 are defined. A conductive line connecting the end T302 is defined as “SL2”.

  The rectifying / smoothing circuits 30 and 32 are both configured as shown in FIG. This configuration is also adopted in the rectifying / smoothing circuit 24 shown in FIG. According to FIG. 11, the cathode of the diode D1 is connected to the cathode of the diode D2, and the anode of the diode D3 is connected to the anode of the diode D4. The anode of diode D1 is connected to the cathode of diode D3, and the anode of diode D2 is connected to the cathode of diode D4.

  On the other hand, the input terminal T301 or T321 is connected to the anode of the diode D1, and the other input terminal T302 or T322 is connected to the anode of the diode D2. One end of the capacitor C3 is connected to the cathode of the diode D1, and the other end of the capacitor C3 is connected to the anode of the diode D3. One end and the other end of the capacitor C3 are connected to one input end and the other input end of the charging circuit 26, respectively.

  Therefore, the AC voltage applied to one input terminal T301 (T321) and the other input terminal T302 (T322) is full-wave rectified by the diodes D1 to D4, and the rectified voltage is smoothed by the capacitor C3. The AC voltage is thus converted into a DC voltage, and the converted DC voltage is supplied to the charging circuit 26.

  Since the entire circuit can be simplified by sharing the rectifying and smoothing circuit as shown in FIG. 2, it is optimal for downsizing the entire apparatus. On the other hand, for example, one end of the secondary coil L6 is connected during magnetic field coupling, and in some cases, unnecessary resonance is generated by the secondary coil L6 and the parasitic capacitance generated mainly by the switch SW2. It becomes. In that case, it is effective to use a circuit configuration as shown in FIG.

  Referring to FIG. 12, at the time of electric field coupling, common terminal T30 of switch SW3 is connected to branch terminal T31, and switch SW4 is turned off. One end of wound body L4 is connected to one end of primary coil L5 forming step-down transformer 22, and the other end of wound body L4 is opened. At this time, the wound body L4 functions as an electric field coupling electrode.

  When the power receiving device 10 is brought close to the power transmitting device 10a, the wound body L4 and the electrode E3 are electrically coupled to the electrodes E1 and E2. As a result, an AC voltage having the same frequency as the AC voltage applied to the electrodes E1 and E2 is excited in the wound body L4 and the electrode E3. The excited AC voltage is applied to one input terminal T321 and the other input terminal T322 of the rectifying and smoothing circuit 32 through the step-down transformer 22.

  Referring to FIG. 13, at the time of magnetic field coupling, common terminal T30 of switch SW3 is connected to branch terminal T32, and switch SW4 is turned on. One end of the wound body L4 is connected to one input end T301 of the rectifying and smoothing circuit 30 via the switch SW3 and the capacitor C1. The other end of the wound body L4 is connected to the other input end T302 of the rectifying / smoothing circuit 30 via the switch SW4. At this time, the wound body L4 functions as an electromagnetic induction coil for magnetic field coupling.

  When the power receiving device 20 is brought close to the power transmitting device 10b, the wound body L4 is magnetically coupled to the electromagnetic induction coil L3. As a result, an AC voltage having the same frequency as the AC voltage applied to the electromagnetic induction coil L3 is excited in the wound body L4. The excited AC voltage is applied to one input terminal T301 and the other input terminal T302 of the rectifying and smoothing circuit 30.

  Returning to FIG. 10, the control circuit 28 refers to the DC voltage supplied from the rectifying / smoothing circuit 30 or 32 to control the setting of the switches SW3 and SW4. Specifically, the control circuit 28 executes processing according to the flowchart shown in FIG.

  First, in step S11, the common terminal T30 of the switch SW3 is connected to the branch terminal T31, and the switch SW4 is turned off. In step S13, the voltage value of the DC voltage supplied from the rectifying / smoothing circuit 30 or 32 is detected, and in step S15, it is determined whether or not the detected voltage value is equal to or greater than a specified value.

  If the determination result is NO, the connection of the switches SW3 and SW4 is changed in step S17. The connection destination of the common terminal T30 provided in the switch SW3 is changed between the branch terminals T31 and T32, and the switch SW4 is changed between the off state and the on state. When the change is completed, the process returns to step S13.

  If the DC voltage output from the rectifying / smoothing circuit 32 becomes equal to or higher than the specified value in a state where the common terminal T30 of the switch SW3 is connected to the branch terminal T31 and the switch SW4 is turned off, the power receiving device 20 is changed to the electric field coupling method. It is assumed that the corresponding power transmission device 10a has been approached, and power reception according to the electric field coupling method is started.

  On the other hand, when the DC voltage output from the rectifying / smoothing circuit 30 becomes equal to or higher than the specified value in a state where the common terminal T30 of the switch SW3 is connected to the branch terminal T32 and the switch SW4 is turned on, the power receiving device 20 Is approached to the power transmission device 10b corresponding to the magnetic field coupling method, and power reception according to the magnetic field coupling method is started.

  Here, the specified value in step S15 may be the same value or a different value between the electric field coupling method and the magnetic field coupling method.

  In the above, the electric field coupling method and the magnetic field coupling method are switched depending on the voltage value after rectification and smoothing. However, a wireless communication is performed by separately providing a transmission side communication circuit and a reception side communication circuit in the power transmission device and the power reception device, respectively. By performing, the electromagnetic coupling method and the magnetic field coupling method may be switched.

  Also in this embodiment, the wound body L4 functions as one electrode for power reception when receiving power according to the electric field coupling method, and also functions as an electromagnetic induction coil when receiving power according to the magnetic field coupling method. The electrode E3 functions as the other electrode for receiving power when receiving power according to the electric field coupling method. Thus, complication of a circuit structure can be suppressed by sharing the wound body L4 as a receiving electrode and an electromagnetic induction coil.

  In the power receiving device 20 shown in FIG. 10, a capacitor C1 is provided on the conductive line SL1. However, a capacitor C2 is added between the conductive lines SL1 and SL2 as shown in FIG. 15, a capacitor C2 is provided instead of the capacitor C1 as shown in FIG. 16, and both the capacitors C1 and C2 are omitted. You may do it. In the power receiving device 20 shown in FIG. 10, a single electrode E3 is provided. However, as shown in FIG. 17, the electrode E3 may be divided into partial electrodes E3_1 and E3_2.

  The power transmission system of another embodiment is formed by the power transmission device 40 shown in FIG. 18 and the power reception device 50a shown in FIG. 19A or the power reception device 50b shown in FIG. 19B. The power transmission device 40 illustrated in FIG. 18 corresponds to both the electric field coupling method and the magnetic field coupling method. In contrast, the power receiving device 50a illustrated in FIG. 19A corresponds only to the electric field coupling method, and the power receiving device 50b illustrated in FIG. 19B corresponds to only the magnetic field coupling method.

  In power transmission device 40 shown in FIG. 18, inverter 42 has one output end T421 and the other output end T422, and converts a DC voltage output from DC power supply Vcc into an AC voltage. The switch SW5 has a common terminal T50 and branch terminals T51 and T52, and the switch SW6 has a common terminal T60 and branch terminals T61 and T62.

  One output terminal T421 of the inverter 42 is connected to one terminal of the primary coil L7 constituting the step-up transformer 44, the other terminal of the primary coil L7 is connected to the branch terminal T61 of the switch SW6, and the common terminal T60 of the switch SW6 is an inverter. 42 is connected to the other output terminal T422.

  One output terminal T421 of the inverter 42 is also connected to the branch terminal T52 of the switch SW5 via the capacitor C4. The common terminal T50 of the switch SW5 is connected to one end of the wound body L9, and the other end of the wound body L9 is connected to the branch terminal T62 of the switch SW6. The branch terminal T51 of the switch SW5 is connected to one end of the secondary coil L8 constituting the step-up transformer 44, and the other end of the secondary coil L8 is connected to the plate-like electrode E4. Here, the secondary coil L8 has a larger number of turns than the number of turns of the primary coil L7.

  In the following, the conductive wire connecting one output terminal T421 of the inverter 42 and the branch terminal T52 of the switch SW5 is particularly defined as “SL3”, and the branch terminal T62 of the switch SW6 and the other end of the wound body L9 are connected to each other. The conductive line to be connected is particularly defined as “SL4”. The capacitor C4 forms an LC resonance circuit together with the wound body L9, and the resonance frequency of the LC resonance circuit is adjusted to be close to the frequency of the AC voltage generated by the inverter 42.

  Referring to FIG. 19A, power receiving circuit 50a includes electric field coupling electrodes E5 and E6. Electrodes E5 and E6 are respectively connected to one end and the other end of primary coil L10 constituting step-down transformer 52. The secondary coil L11 constituting the step-down transformer 52 has a number of turns smaller than that of the primary coil, and one end and the other end of the secondary coil L11 are connected to one input end and the other input end of the rectifying / smoothing circuit 54, respectively. The A charging circuit 56 for charging the battery BT is provided at the subsequent stage of the rectifying / smoothing circuit 54.

  Referring to FIG. 19B, the power receiving circuit 50b includes an electromagnetic induction coil L12 for magnetic field coupling. One end and the other end of the electromagnetic induction coil L12 are connected to one input end and the other input end of the rectifying and smoothing circuit 54, respectively. A charging circuit 56 that charges the battery BT is also provided after the rectifying / smoothing circuit 54.

  Referring to FIG. 20A, during electric field coupling, common terminal T50 of switch SW5 is connected to branch terminal T51, and common terminal T60 of switch SW6 is connected to branch terminal T61. One end of the wound body L9 is connected to one end of the secondary coil L8 that forms the step-up transformer 44, and the other end of the wound body L9 is opened. Further, the other end of the primary coil L7 constituting the step-up transformer 44 is connected to the other output end T422 of the inverter 42. At this time, the wound body L9 functions as an electric field coupling electrode.

  The AC voltage output from one output terminal T421 and the other output terminal T422 of the inverter 42 is boosted by the step-up transformer 44 and then applied to the wound body L9 and the electrode E4. When the power receiving device 50a is brought close to the power transmitting device 40, the wound body L9 and the electrode E4 are electrically coupled to the electrodes E5 and E6. An alternating voltage having the same frequency as the alternating voltage applied to the wound body L9 and the electrode E4 is excited on the electrodes E5 and E6. The excited AC voltage is stepped down by the step-down transformer 52 and then converted into a DC voltage by the rectifying and smoothing circuit 54. The charging circuit 56 charges the battery BT based on the DC voltage thus converted.

  Referring to FIG. 20B, at magnetic field coupling, common terminal T50 of switch SW5 is connected to branch terminal T52, and common terminal T60 of switch SW6 is connected to branch terminal T62. One end of wound body L9 is connected to one output end T421 of inverter 42 via switch SW5 and capacitor C4. The other end of the wound body L9 is connected to the other output terminal T422 of the inverter via the switch SW6. At this time, the wound body L9 functions as an electromagnetic induction coil for magnetic field coupling.

  The AC voltage output from one output end T421 and the other output end T422 of the inverter 42 is applied to one end and the other end of the wound body L9. When the power receiving device 50b is brought close to the power transmitting device 40, the wound body L9 is magnetically coupled to the electromagnetic induction coil L12. As a result, an AC voltage having the same frequency as the AC voltage applied to the wound body L9 is excited in the electromagnetic induction coil L12. The rectifying and smoothing circuit 54 converts the excited AC voltage into a DC voltage, and the charging circuit 56 charges the battery BT based on the converted DC voltage.

  Returning to FIG. 18, the control circuit 46 refers to the impedance on the output side of the inverter 42 to control the setting of the switches SW5 and SW6. Specifically, the control circuit 46 executes processing according to the flowchart shown in FIG.

  First, in step S21, the common terminal T50 of the switch SW5 is connected to the branch terminal T51, and the common terminal T60 of the switch SW6 is connected to the branch terminal T61. In step S23, the impedance on the output side of the inverter 42 is measured, and in step S25, it is determined whether or not the measured impedance is within a specified range. If the determination result is NO, it is assumed that neither the power receiving device 50a nor 50b exists in the vicinity of the power transmitting device 40, and the process returns to step S23.

  On the other hand, if the determination result in step S25 is YES, it is considered that either one of the power receiving devices 50a and 50b exists in the vicinity of the power transmitting device 50, and which of the power receiving devices 50a and 50b exists is determined in step S27. And in S29. In both steps S27 and S29, the impedance measured in step S23 is referred to.

  If the impedance indicates a value corresponding to the electric field coupling method, it is considered that the power receiving device 50a exists in the vicinity of the power transmitting device 50, and YES is determined in step S27. As a result, power transmission is started with the common terminal T50 of the switch SW5 connected to the branch terminal T51 and the common terminal T60 of the switch SW6 connected to the branch terminal T61.

  If the impedance is different from both the value corresponding to the electric field coupling method and the value corresponding to the magnetic field coupling method, NO is determined in step S29, and the connection of the switches SW5 and SW6 is changed in step S31. The connection destination of the common terminal T50 provided in the switch SW5 is changed between the branch terminals T51 and T52, and the connection destination of the common terminal T60 provided in the switch SW6 is changed between the branch terminals T61 and T62. When the change is completed, the process returns to step S23.

  If the impedance measured in step S23 shows a value corresponding to the magnetic field coupling method, it is considered that the power receiving device 50b exists in the vicinity of the power transmitting device 50, and YES is determined in step S25 and step S29. As a result, power transmission is started with the common terminal T50 of the switch SW5 connected to the branch terminal T52 and the common terminal T60 of the switch SW6 connected to the branch terminal T62.

  Here, the specified range in step S25 may be the same range or a different range between the electric field coupling method and the magnetic field coupling method.

  Further, in the above, the electric field coupling method and the magnetic field coupling method are switched depending on the impedance value, but by separately providing a transmission side communication circuit and a reception side communication circuit in the power transmission device and the power reception device, and performing wireless communication, The electromagnetic coupling method and the magnetic field coupling method may be switched.

  That is, for example, the following is performed.

  The transmission side communication circuit of the power transmission apparatus transmits the electric field status signal to the reception side communication circuit when receiving the electric field status signal from the reception side communication circuit, and then transmits the electric field coupling method when receiving the electric field coupling hold signal. Have a function to start. When reception of the electric field status signal from the receiving communication circuit times out, the magnetic field status signal is transmitted to the receiving communication circuit when the magnetic field status signal is received from the receiving communication circuit, and then the magnetic field coupling is performed. A function of starting power transmission by a magnetic field coupling method when a hold signal is received is provided. In addition, when reception of the magnetic field status signal from the receiving side communication circuit times out, the process is repeated from the point of receiving the electric field status signal from the receiving side communication circuit.

  When the communication circuit of the electric field coupling type power receiving device sends the electric field status signal to the power transmission device and receives the electric field status signal from the power transmission device, the power receiving device 50a corresponding to the electric field coupling method is regarded as being brought closer to the power transmission device 40. Then, an electric field coupling hold signal is transmitted to the power transmission device, and power reception according to the electric field coupling method is started. In addition, when the communication circuit of the magnetic field coupling type power receiving device transmits the magnetic field status signal and receives the magnetic field status signal from the power transmission device, the power receiving device 50b corresponding to the magnetic field coupling method is regarded as being brought closer to the power transmission device 40, A magnetic field coupling hold signal is transmitted to the power transmission device, and power reception according to the magnetic field coupling method is started.

  As can be seen from the above description, the power transmission device 40 transmits power to either the power receiving device 50a corresponding to the electric field coupling method or the power receiving device 50b corresponding to the magnetic field coupling method. In the power transmission device 40, both the wound body L9 and the electrode E4 have conductivity. The inverter 24 converts a DC voltage into an AC voltage, and outputs the converted AC voltage from one output terminal T421 and the other output terminal T422. Step-up transformer 44 electrically connects one end of wound body L9 and electrode E4 to one output end T421 and the other output end T422 during electric field coupling. Conductive lines SL3 and SL4 electrically connect one end and the other end of wound body L9 to one output end T421 and the other output end T422 during magnetic field coupling.

  Thus, wound body L9 functions as one electrode for power transmission during power transmission according to the electric field coupling method, and also functions as an electromagnetic induction coil during power transmission according to the magnetic field coupling method. The electrode E4 functions as the other electrode for power transmission during power transmission according to the electric field coupling method. Thus, complication of a circuit structure can be suppressed by sharing the wound body L9 as a power transmission electrode and an electromagnetic induction coil.

  In the power transmission device 40 shown in FIG. 18, a capacitor C4 is provided on the conductive line SL3. However, a capacitor C5 is added between the conductive lines SL3 and SL4 as shown in FIG. 22, a capacitor C5 is provided instead of the capacitor C4 as shown in FIG. 23, and both the capacitors C4 and C5 are omitted. You may do it.

  Moreover, in the power transmission apparatus 40 shown in FIG. 18, the single electrode E4 is provided. However, as shown in FIG. 24, the electrode E4 may be divided into partial electrodes E4_1 and E4_2. Further, according to FIG. 19A and FIG. 19B, the power receiving device 50a corresponds only to the electric field coupling method, and the power receiving device 50b corresponds to only the magnetic field coupling method. However, the configurations of the power receiving devices 50a and 50b may be integrated to prepare a power receiving device corresponding to both the electric field coupling method and the magnetic field coupling method.

  In the power transmission system of the other embodiments, the power transmission device 40 is configured as shown in FIG. However, the power transmission device 40 shown in FIG. 25 is the same as the power transmission device 40 shown in FIG. 18 except that switches SW7 and SW8 are added and the control circuit 46 controls the switches SW7 and SW8 in addition to the switches SW5 and SW6. Therefore, the redundant description regarding the same configuration is omitted as much as possible. Also in this embodiment, the capacitor C4 forms an LC resonance circuit together with the wound body L9, and the resonance frequency of the LC resonance circuit is adjusted to be close to the frequency of the AC voltage generated by the inverter 42.

  The switch SW7 has a common terminal T70 and branch terminals T71 and T72. The common terminal T70 is connected to one output terminal T421 of the inverter 42, the branch terminal T71 is connected to the branch terminal T52 of the switch SW5 via the capacitor C4, and the branch terminal T72 is connected to one end of the primary coil L7. The switch SW8 is provided between the branch terminal T51 of the switch SW5 and the branch terminal T62 of the switch SW6.

  Referring to FIG. 26A, during electric field coupling, common terminal T50 of switch SW5 is connected to branch terminal T51, and common terminal T60 of switch SW6 is connected to branch terminal T61. The common terminal T70 of the switch SW7 is connected to the branch terminal T72, and the switch SW8 is turned on.

  One end of the wound body L9 is connected to one end of the secondary coil L8 that forms the step-up transformer 44, and the other end of the wound body L9 is opened. Further, one end and the other end of the wound body L9 are short-circuited by the switch SW8. Further, one end and the other end of the primary coil L7 constituting the step-up transformer 44 are connected to one output end T421 and the other output end T422 of the inverter 42, respectively. When the conductive line short-circuited by the switch SW8 is defined as “SL5”, the conductive line SL5 forms an electric field coupling electrode together with the wound body L9.

  The AC voltage output from one output terminal T421 and the other output terminal T422 of the inverter 42 is boosted by the step-up transformer 44 and then applied to the conductive line SL5, the wound body L9, and the electrode E4. When the power receiving device 50a shown in FIG. 19A is brought close to the power transmitting device 40, the conductive line SL5 and the wound body L9 are electrically coupled to the electrode E5, and the electrode E4 is electrically coupled to the electrode E6. An AC voltage having the same frequency as the AC voltage applied to the conductive line SL5, the wound body L9 and the electrode E4 is excited on the electrodes E5 and E6. The excited AC voltage is stepped down by the step-down transformer 52 and then converted into a DC voltage by the rectifying and smoothing circuit 54. The charging circuit 56 charges the battery BT based on the DC voltage thus converted.

  Referring to FIG. 26B, at magnetic field coupling, common terminal T50 of switch SW5 is connected to branch terminal T52, and common terminal T60 of switch SW6 is connected to branch terminal T62. The common terminal T70 of the switch SW7 is connected to the branch terminal T71, and the switch SW8 is turned off. Therefore, one end of wound body L9 is connected to one output end T421 of inverter 42 via switch SW5, capacitor C4, and switch SW7. The other end of the wound body L9 is connected to the other output terminal T422 of the inverter via the switch SW6. At this time, the wound body L9 functions as an electromagnetic induction coil for magnetic field coupling.

  The AC voltage output from one output end T421 and the other output end T422 of the inverter 42 is applied to one end and the other end of the wound body L9. When the power receiving device 50b shown in FIG. 19B is brought close to the power transmitting device 40, the wound body L9 is magnetically coupled to the electromagnetic induction coil L12. As a result, an AC voltage having the same frequency as the AC voltage applied to the wound body L9 is excited in the electromagnetic induction coil L12. The rectifying and smoothing circuit 54 converts the excited AC voltage into a DC voltage, and the charging circuit 56 charges the battery BT based on the converted DC voltage.

  The electrode E4 and the wound body L9 are provided in the power transmission device 40 in the manner shown in FIGS. 27A and 27B. The power transmission device 40 has a rectangular parallelepiped housing THS, and the electrode E4 is formed in a rectangular plate shape. The electrode E4 is provided approximately at the center of the upper surface of the housing THS in such a posture that the orientation of the upper surface thereof coincides with the orientation of the upper surface of the housing THS. The wound body L9 is provided on the upper surface of the housing THS so that the winding axis is orthogonal to the upper surface of the housing THS and surrounds the electrode E4.

  The electrode E4 is provided with a space near the center of the opening of the wound body L9 as shown in FIGS. 27A and 27B, so that the eddy current caused by the proximity of the wound body on the power receiving device side can be reduced. Occurrence can be reduced.

  A ground electrode GND is provided on the lower surface of the housing THS. The ground electrode GND is also formed in a rectangular plate shape, and is provided at substantially the center of the lower surface of the housing THS so that the orientation of the lower surface coincides with the orientation of the lower surface of the housing THS. When the housing THS is viewed from below, both the electrode E4 and the wound body L9 are covered with the ground electrode GND. The ground electrode GND having such a size also functions as a shield that suppresses radiation of an electric field or a magnetic field during power transmission to the power receiving device 50a or 50b. In addition, components or circuits other than the wound body L9 and the electrode E4 are housed in the power transmission module 48.

  Although not shown in the drawings, by attaching a magnetic sheet to the surface of the ground electrode GND (winding body L9 side), it can be efficiently combined with the winding body on the power receiving device side.

  In this embodiment, the power receiving device 50a employing the electric field coupling method is configured as shown in FIG. According to FIG. 28A, the power receiving device 50a includes a rectangular parallelepiped housing RHS. The electrodes E5 and E6 are formed in a plate shape such that the contours forming the main surfaces are rectangular. However, regarding the size of the contour, the electrode E5 is much larger than the electrode E6. The electrode E5 has a rectangular hole penetrating from the upper surface toward the lower surface, and the size of the rectangle forming the hole is larger than the size of the main surface of the electrode E6. Furthermore, the electrodes E5 and E6 are provided at the center of the upper surface of the housing RHS so that the orientation of the upper surface of each of the electrodes E5 and E6 matches the orientation of the upper surface of the housing RHS. The electrode E6 is received in a hole provided in the electrode E5.

  Referring to FIG. 29, power reception device 50 a is placed on power transmission device 40 with the upper surface facing the upper surface of power transmission device 40. As can be seen from FIG. 29, the size of the main surface of the housing RHS that forms the power receiving device 50 a is about 2/3 of the size of the main surface of the housing THS that forms the power transmitting device 40. Further, the size of the main surface of the electrode E6 provided in the power receiving device 50a is slightly larger than the size of the main surface of the electrode E4 provided in the power transmission device 40. Furthermore, the size of the electrode E5 provided in the power receiving device 50a is adjusted so that the electrode E5 partially overlaps the wound body L9 in a state where the electrode E4 is positioned so as to be covered by the electrode E6.

  In this embodiment, the power receiving device 50b employing the magnetic field coupling method is configured as shown in FIG. According to FIG. 28 (B), the power receiving device 50b has a rectangular parallelepiped housing RHS. The wound body L12 is provided on the upper surface of the housing RHS so that its winding axis is orthogonal to the upper surface of the housing RHS.

  Referring to FIG. 30, power reception device 50 b is placed on power transmission device 40 with the upper surface facing the upper surface of power transmission device 40. As can be seen from FIG. 30, the size of the main surface of the housing RHS that forms the power receiving device 50 b is much smaller than the size of the main surface of the housing THS that forms the power transmitting device 40. Therefore, a plurality of power receiving devices 50b, 50b,... Can be placed inside the wound body L9 provided in the power transmitting device 40.

  Also in this embodiment, the wound body L9 functions as one electrode for power transmission during power transmission according to the electric field coupling method, and also functions as an electromagnetic induction coil during power transmission according to the magnetic field coupling method. The electrode E4 functions as the other electrode for power transmission during power transmission according to the electric field coupling method. Thus, complication of a circuit structure can be suppressed by sharing the wound body L9 as a power transmission electrode and an electromagnetic induction coil. In this embodiment, the conductive line SL5 also functions as one electrode for power transmission according to the electric field coupling method. Thereby, the power transmission performance is improved.

  In this embodiment, the line width of the wound body L9 provided in the power transmission device 40 is uniform, but as shown in FIG. 31, the line width of the wound body L9 is partially increased. Also good. As a result, when the wound body L9 is caused to function as one electrode for power transmission according to the electric field coupling method, the coupling capacity with the power receiving device 50a is increased, high power transmission is possible, or power transmission efficiency is improved.

  In this embodiment, a single electrode E4 is provided in the power transmission device 40. However, the electrode E4 may be divided into partial electrodes E4_1 and E4_2 as shown in FIG. 24 described above, and the partial electrodes E4_1 and E4_2 may be provided on the upper surface of the housing THS as shown in FIG. In this case, the power receiving device 50a employing the electric field coupling method is configured as shown in FIG. Note that the power receiving device 50a illustrated in FIG. 33 is substantially the same as the power receiving device 50a illustrated in FIG. 28A, except that the size thereof is approximately half the size of the power receiving device 50a illustrated in FIG. .

  Referring to FIG. 34, power reception device 50 a is placed on power transmission device 40 with the upper surface facing the upper surface of power transmission device 40. As can be seen from FIG. 34, the size of the main surface of the housing RHS that forms the power receiving device 50a is about 1/3 of the size of the main surface of the housing THS that forms the power transmitting device 40. In addition, the size of the main surface of the electrode E6 provided in the power receiving device 50a is slightly larger than the size of the main surface of the electrode E4_1 or E4_2 provided in the power transmission device 40. Further, the size of the electrode E5 provided in the power receiving device 50a is adjusted so that the electrode E5 partially overlaps the wound body L9 in a state where the electrode E4_1 or E4_2 is positioned so as to be covered by the electrode E6.

  According to FIG. 24, the electrodes E4_1 and E4_2 are always connected to the secondary coil L8 constituting the step-up transformer 44. However, the connection with the secondary coil L8 may be turned on / off depending on whether or not it is covered with the electrode E6 of the power receiving device 50a.

DESCRIPTION OF SYMBOLS 10, 40 ... Power transmission apparatus 20, 50 ... Power receiving apparatus 12, 42 ... Inverter 22 ... Step-down transformer 24, 30, 32, 54 ... Rectification smoothing circuit 28, 46 ... Control circuit

Claims (15)

A power receiving device that receives power transmitted from a power transmitting device employing at least one of an electric field coupling method and a magnetic field coupling method,
A conductive wound body,
A conductive plate-like body,
Conversion means for converting the AC voltage into a DC voltage, having one input end to which an AC voltage is applied and the other input end;
First connection means for electrically connecting one end of the wound body and the plate-like body to the one input end and the other input end during electric field coupling, and one end and the other end of the wound body during magnetic field coupling A power receiving device comprising: second connection means for electrically connecting the first input end and the other input end. The first connecting means includes a primary coil having one end and the other end connected to one end of the wound body and the plate-like body, respectively, and one connected to the one input end and the other input end, respectively. A secondary coil having an end and the other end and forming a step-down transformer with the primary coil,
The second connection means includes a first conductive line connecting one end of the wound body to the one input end, and a second conductive line connecting the other end of the wound body to the other input end. Item 1. A power receiving device according to Item 1.   The power receiving device according to claim 2, further comprising a first capacitor provided on the first conductive line.   The power receiving device according to claim 2, further comprising a second capacitor provided between the first conductive line and the second conductive line. First switching means for switching a connection destination of one end of the wound body between one end of the primary coil and the first conductive wire; and a connection destination of the other input end to the other end of the secondary coil. The power receiving device according to any one of claims 2 to 4, further comprising second switching means for switching between the second conductive line. The conversion means includes first voltage conversion means corresponding to the electric field coupling method, and second voltage conversion means corresponding to the magnetic field coupling method,
The one input terminal includes a first one voltage input terminal assigned to the first voltage conversion means, and a second one voltage input terminal assigned to the second voltage conversion means,
The other input terminal includes a first other voltage input terminal assigned to the first voltage conversion means, and a second other voltage input terminal assigned to the second voltage conversion means,
One end and the other end of the secondary coil are respectively connected to the first one voltage input end and the first other voltage input end,
5. The power receiving device according to claim 2, wherein the first conductive line and the second conductive line are connected to the second one voltage input terminal and the second other voltage input terminal, respectively. A third switching means for switching a connection destination of one end of the wound body between the one end of the primary coil and the first conductive wire; and a fourth switching means for intermittently connecting the second conductive wire; The power receiving device according to claim 6.   The power receiving device according to claim 1, wherein the plate-like body includes a plurality of partial plate-like bodies. A power transmission device that transmits power to a power receiving device that employs at least one of an electric field coupling method and a magnetic field coupling method,
A conductive wound body,
A conductive plate-like body,
Conversion means for converting the DC voltage into the AC voltage, having one output end to which an AC voltage is applied and the other output end;
First connection means for electrically connecting one end of the wound body and the plate-like body to the one output end and the other output end during electric field coupling; and one end and the other end of the wound body during magnetic field coupling; A power transmission device comprising: second connection means for electrically connecting the first output end and the other output end. The first connecting means includes a primary coil having one end and the other end connected to the one output end and the other output end, respectively, and one end connected to the one end of the wound body and the plate-like body, respectively. A secondary coil having an end and the other end and forming a step-up transformer with the primary coil;
The second connection means includes a first conductive line that connects one end of the wound body to the one output end, and a second conductive line that connects the other end of the wound body to the other output end. Item 10. The power transmission device according to Item 9.   The power transmission device according to claim 10, further comprising a first capacitor provided on the first conductive line.   The power transmission device according to claim 10 or 11, further comprising a second capacitor provided between the first conductive line and the second conductive line. First switching means for switching a connection destination of one end of the wound body between one end of the secondary coil and the first conductive wire; and a connection destination of the other output end to the other end of the primary coil. The power transmission device according to any one of claims 10 to 12, further comprising second switching means for switching between the second conductive lines. A power transmission system that includes a power transmission device that employs at least one of an electric field coupling method and a magnetic field coupling method, and a power reception device that receives power transmitted from the power transmission device,
The power receiving device is:
A conductive wound body,
A conductive plate-like body,
Conversion means for converting the AC voltage into a DC voltage, having one input end to which an AC voltage is applied and the other input end;
First connection means for electrically connecting one end of the wound body and the plate-like body to the one input end and the other input end during electric field coupling, and one end and the other end of the wound body during magnetic field coupling A power transmission system comprising second connection means for electrically connecting the first input end and the other input end. A power transmission system including a power receiving device that employs at least one of an electric field coupling method and a magnetic field coupling method, and a power transmission device that transmits power to the power receiving device,
The power transmission device is:
A conductive wound body,
A conductive plate-like body,
Conversion means for converting the DC voltage into the AC voltage, having one output end to which an AC voltage is applied and the other output end;
First connection means for electrically connecting one end of the wound body and the plate-like body to the one output end and the other output end during electric field coupling; and one end and the other end of the wound body during magnetic field coupling; A power transmission system comprising second connection means for electrically connecting the first output end and the other output end.

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