JP3206983U - Wireless power supply system - Google Patents

Abstract

In a wireless power feeding system, it is possible to detect a state where a charging target is not charged due to an abnormality in a power feeding path. A power transmission unit having a power supply unit that outputs high-frequency power, a power transmission coil unit that transmits high-frequency power supplied from the power supply unit, and a power transmission coil unit without being in contact with the power transmission coil unit. A power receiving coil unit 4 that receives high-frequency power transmitted from the coil unit 3, a power receiving unit 5 that supplies the high-frequency power received by the power receiving coil unit 4 to the automatic guided vehicle, and charges the automatic guided vehicle; 2, a power feeding coil unit 3, a power receiving coil unit 4, a power receiving unit 5, and an automatic guided vehicle, and a predetermined display is displayed when power is supplied to the power feeding path. Display devices 8A to 8D to be provided. [Selection] Figure 2

Description

  The present invention relates to a wireless power feeding system.

  We know technologies related to contactless power transmission (wireless power feeding) that use various methods such as electromagnetic induction and magnetic resonance to supply power output from the power source to the load without directly connecting the load to the power source. It has been. The technology related to non-contact power transmission is applied to power transmission to, for example, mobile phones, home appliances, electric vehicles, automatic guided vehicles, and the like.

  The following Patent Document 1 discloses an example of a wireless power feeding system. Specifically, the wireless power feeding system described in Patent Literature 1 includes a power transmission side board unit and a power reception side board unit. The power transmission side board unit is mounted with a solar panel, a power transmission circuit, and a power transmission side coil, and the solar panel is exposed at least on the vehicle outer side of the outer shell member of the vehicle. A power receiving side coil unit, a power receiving circuit, and an electric device are mounted on the power receiving side substrate unit, and the unit is provided on the inner side of the outer shell member. Furthermore, the power transmission side board unit and the power reception side board unit are provided at positions where power transmission is possible between the power transmission side coil and the power reception side coil facing each other.

Japanese Patent Laid-Open No. 2015-1116068

  When charging the automatic guided vehicle with the conventional wireless power supply system as described above, there is a situation in which the charging power does not reach the automatic guided vehicle to be charged due to an abnormality in the power supply path. If the detection of such a situation is delayed, it will take a long time until the automatic guided vehicle is fully charged.

  The present invention has been made in view of such circumstances, and an object of the present invention is to make it possible to detect a state in which a charging target is not charged due to an abnormality in a power feeding path in a wireless power feeding system.

  A wireless power feeding system according to an aspect of the present invention is provided without contacting a power transmission unit having a power supply unit that outputs high-frequency power, a power transmission coil unit that transmits high-frequency power supplied from the power supply unit, and the power transmission coil unit. A power receiving coil unit that receives the high frequency power transmitted from the power transmission coil unit, a power receiving unit that supplies the high frequency power received by the power receiving coil unit to the automatic guided vehicle, and charges the automatic guided vehicle; And a display that is provided in a power feeding path formed by the power transmission coil unit, the power receiving coil unit, the power receiving unit, and the automatic guided vehicle, and that performs a predetermined display when power is supplied to the power feeding path. .

  In the wireless power feeding system, it is also preferable that a plurality of indicators are provided in the power feeding path.

  The wireless power feeding system includes a first coil provided around a cable connecting the power transmission unit and the power transmission coil unit, a second coil provided between the power transmission coil unit and the power reception coil unit, A third coil provided around the cable connecting the coil unit and the power receiving unit, and a fourth coil provided around the cable connecting the power receiving unit and the automatic guided vehicle, and a plurality of displays It is also preferable that the vessel includes a first coil, a second coil, a third coil, and a fourth coil that are electrically connected to each other.

  According to the present invention, in a wireless power feeding system, it is possible to detect a state in which a charging target is not charged due to an abnormality in a power feeding path.

1 is a block diagram schematically showing an example of a configuration of a wireless power feeding system according to an embodiment of the present invention. It is a block diagram showing roughly an example of composition of a display concerning one embodiment of the present invention. It is a block diagram which shows roughly an example of a structure of the display apparatus which concerns on other embodiment of this invention. It is a block diagram which shows roughly an example of a structure of the display apparatus which concerns on other embodiment of this invention.

  Embodiments according to the present invention will be described in detail. In addition, the following embodiment is an illustration for demonstrating this invention, and is not the meaning which limits this invention only to the embodiment.

  Hereinafter, a case where a power source (capacitor unit) of an automatic guided vehicle (hereinafter also referred to as “AGV”) is charged by using the wireless power feeding system 1 according to the present invention will be exemplarily described. The AGV is an unmanned transport vehicle that automatically travels using electromagnetic induction by a magnetic tape or a magnetic bar laid on the floor surface in a production line of a factory, for example. FIG. 1 is a block diagram schematically showing an example of the configuration of a wireless power feeding system 1 according to the present invention.

  The wireless power feeding system 1 transmits, in a contactless manner, high-frequency power of several kHz to several hundred MHz from a power transmission device (power transmission unit 2 and power transmission coil unit 3) to a power reception device (power reception coil unit 4 and power reception unit 5) by a magnetic field resonance method. In this system, DC power is supplied to the capacitor unit 6 from the power receiving apparatus that has received the high frequency power, and the electric power to be supplied to the AGV 7 by the electric double layer capacitor 61 of the capacitor unit 6 that has received DC power is stored.

  For example, the power transmission device is installed in a space for loading and unloading luggage along the production line, and the power reception device and the capacitor unit 6 are mounted on the AGV 7.

  The wireless power feeding system 1 according to the present embodiment includes a power transmission unit 2, a power transmission coil unit 3, a power receiving coil unit 4, a capacitor unit 6, an AGV 7, and a plurality of display devices 8A to 8D (hereinafter collectively referred to as “display”). Device 8 ”). In FIG. 1, a power transmission unit 2 and a power transmission coil unit 3, a power reception coil unit 4 and a power reception unit 5, a power reception unit 5 and a capacitor unit 6, and a capacitor unit 6 and an AGV 7 are connected by a power cable 9.

  The power transmission unit 2 includes a high-frequency power source (which is an example of a power supply unit) 21 and a control unit 22. The high frequency power supply 21 generates high frequency power having a predetermined frequency (high frequency of several kHz to several hundred MHz). The high-frequency power source 21 includes a high-frequency signal generation circuit that generates a high-frequency signal (voltage signal), a power amplifier that amplifies the high-frequency signal generated by the high-frequency signal generation circuit, and a DC-DC that supplies a DC power supply voltage to the power amplifier. The converter includes a low-pass filter that removes a high-frequency component of a high-frequency signal output from the power amplifier, and a power control unit that controls the amount of high-frequency power output from the power amplifier.

  The power amplifier can be composed of, for example, a class D amplifier or a class E amplifier, and has the same period as the high frequency signal by driving the switching element on and off with the high frequency signal input from the high frequency signal generation circuit. Then, a high-frequency signal having an amplitude depending on the DC voltage input from the DC-DC converter is generated. This high-frequency signal is shaped into a sinusoidal high-frequency signal by removing a high-frequency component with a low-pass filter, and then output.

  The power control unit controls the amplitude of the DC voltage output from the DC-DC converter based on the output control signal input from the control unit 22, and thereby the amount of amplification of the high-frequency signal output from the power amplifier (that is, Control the amount of high-frequency power).

  The control unit 22 includes a microcomputer having a ROM, a RAM, a CPU, etc., an FPGA (field-programmable gate array), and the like. The control unit 22 outputs an output control signal for controlling the output voltage of the DC-DC converter to the high frequency power source 21 and controls the high frequency power output from the high frequency power source 21.

  The power transmission coil unit 3 includes a power transmission unit 31. The power transmission unit 31 wirelessly transmits the high frequency power output from the high frequency power source 21 of the power transmission unit 2 to the power reception unit 41 of the power receiving coil unit 4. The power transmission unit 31 includes, for example, a series resonance circuit including an inductor (hereinafter also referred to as “power transmission coil”) and a capacitor connected in series to the inductor. As an example, the power transmission coil is a winding coil, a laminated coil, a thin film coil, or the like. Further, the power transmission coil may be composed of a multi-turn solenoid coil. The series resonance frequency (= 1 / [2π · √ (L · C)]) (L: self-inductance of the inductor, C: capacitance of the capacitor) of the series resonance circuit in the power transmission unit 31 is a high frequency output from the high frequency power supply 21. The frequency of power (hereinafter also referred to as “power supply frequency”) is adjusted to [MHz].

  The power receiving coil unit 4 includes a power receiving unit 41. The power receiving unit 41 receives the high frequency power from the power transmitting unit 31 by magnetic field coupling with the power transmitting unit 31 of the power transmitting coil unit 3. The power receiving unit 41 has the same configuration as that of the power transmitting unit 31 and includes a series resonance circuit including an inductor (hereinafter also referred to as “power receiving coil”) and a capacitor connected in series to the inductor. As an example, the power receiving coil is a winding coil, a laminated coil, a thin film coil, or the like, and may be composed of a multi-turn solenoid coil. The series resonance frequency (= 1 / [2π · √ (L · C)]) (L: self-inductance of the inductor, C: capacitance of the capacitor) of the series resonance circuit in the power receiving unit 41 is adjusted to the power supply frequency [MHz]. ing.

  The power receiving unit 5 includes a rectifier circuit 51. The rectifier circuit 51 rectifies the high-frequency signal output from the power receiving unit 41 of the power receiving coil unit 4 and supplies DC power to the capacitor unit 6. The rectifier circuit 51 is configured by, for example, a bridge circuit in which four rectifier elements are bridge-connected. Schottky barrier diodes are used as the four rectifying elements.

  The capacitor unit 6 includes an electric double layer capacitor 61 and a DC-DC converter 62. The electric double layer capacitor 61 may be configured by combining a plurality of electric double layer capacitors in series and in parallel, or may be a single electric double layer capacitor, which is appropriately selected according to the power supplied to the AGV 7. Can be configured.

  The electric double layer capacitor 61 is charged by a DC voltage applied from the power receiving unit 5 and stores electric charge. The electric double layer capacitor 61 discharges DC power based on the stored electric charge, and supplies power to the AGV 7 via the DC-DC converter 62. The DC-DC converter 62 adjusts (steps up / down) the DC voltage input from the electric double layer capacitor 61 and supplies the adjusted DC voltage to the AGV 7.

  In FIG. 1, the electric double layer capacitor 61 is housed in the capacitor unit 6, but a lead storage battery can be housed in place of the electric double layer capacitor 61.

A display mode of the display device 8 according to the present embodiment will be described with reference to FIG.
FIG. 2 is a diagram schematically illustrating how the display device 8 indicates a power transmission state. In FIG. 2, from the wireless power feeding system 1, the power transmission unit 2 to the capacitor unit 6 are extracted and described.

  The display devices 8A to 8D are coils 81A to 81D (an example of the first coil, the second coil, the third coil, and the fourth coil, respectively, and collectively referred to as “coil 81”) and a lamp such as an LED. 82A to 82D (an example of a display. Hereinafter, collectively referred to as “lamp 82”). The display device 8 is provided in a power feeding path formed by the power transmission unit 2, the power transmission coil unit 3, the power reception coil unit 4, the power reception unit 5, and the capacitor unit 6.

  The display device 8 </ b> A is provided between the power transmission unit 2 and the power transmission coil unit 3. Further, the display device 8B is provided between the power transmission coil unit 3 and the power reception coil unit 4. Further, the display device 8 </ b> C is provided between the power receiving coil unit 4 and the power receiving unit 5, and the display device 8 </ b> D is provided between the power receiving unit 5 and the capacitor unit 6. In the present embodiment, the wireless power feeding system 1 includes four display devices 8. However, the present invention is not limited to this, and the number of display devices 8 may be any number. Further, the display device 8 is not limited to the configuration provided between the units, and may be a configuration provided in each unit. In this case, the display device 8 </ b> B preferably has a configuration included in the power receiving coil unit 4.

  The display devices 8A, 8C, 8D are positioned so that the power cable 9 passes inside the coils 81A, 81C, 81D, respectively. In the display devices 8A, 8C, and 8D, when a current flows through the power cable 9, an induced electromotive force is generated in the coil 81 by electromagnetic induction. As a result, the lamp 82 is turned on (an example of a predetermined display), whereby the display devices 8A, 8C, and 8D display that power is being transmitted to each unit.

  On the other hand, in the display device 8B, the power cable 9 is not provided inside the coil 81B. Power is transmitted wirelessly from the power transmission coil unit 3 to the power reception coil unit 4 by magnetic field resonance. At this time, the magnetic fields of the power transmission coil unit 3 and the power reception coil unit 4 vibrate at the same frequency. The display device 8 </ b> B includes a coil 81 </ b> B having the same resonance frequency as the resonance frequency of the power transmission coil unit 3 and the power reception coil unit 4. Thereby, when the magnetic field of the power transmission coil unit 3 vibrates, the coil 81B of the display device 8B also resonates to generate an induced electromotive force in the coil 81B. As a result, the lamp 82B is lit (an example of a predetermined display), whereby the display device 8B displays that the power receiving coil unit 4 is receiving power. When the wireless power feeding system 1 performs power feeding by an electromagnetic induction method, the display device 8B is provided so that at least a part of the magnetic flux penetrating the power transmitting coil unit 3 and the power receiving coil unit 4 passes inside the coil 81B. It is preferred that

  As described above, the lamp 82 of the display device 8 is lit when power is supplied to the above-described power supply path (an example of a predetermined display). The user can determine whether or not the AGV 7 is charged by checking the lighting state of the lamp 82. For example, when the lamps 82 are lit in all the display devices 8 provided in the power supply path, the user can determine that the AGV 7 is charged. On the other hand, when the display device 8 in which the lamp 82 is not lit is included, by confirming the position where the display device 8 in which the lamp 82 is lit is provided, the user can power up to which unit. It can be judged whether it has reached.

  An arrow E in FIG. 2 schematically shows a state where power is being transmitted. In FIG. 2, power is transmitted to the power receiving unit 5, and no power is transmitted from the power receiving unit 5 to the capacitor unit 6.

  Therefore, in the example of FIG. 2, the lamps 82A to 82C of the display devices 8A to 8C are lit, and the lamp 82D of the display device 8D is not lit. As described above, in the wireless power feeding system 1 according to the present embodiment, by providing the display device 8, the user can visually check how much power has reached each unit.

[Other Embodiments]
A modification of the wireless power feeding system 1 according to the present invention will be described with reference to FIGS. 3 and 4. In the description of the modified example, description of matters common to the above-described embodiment is omitted, and only different points will be described. In particular, the same operation effect by the same configuration will not be mentioned sequentially.

  The wireless power feeding system 1 according to the present invention is also applicable when there are a plurality of power feeding targets. In the example of FIG. 3, the wireless power feeding system 1 of the modified example includes a plurality of configurations after the power transmission coil unit 3 with respect to one power transmission unit 2. Specifically, the wireless power feeding system 1 of the modified example includes, for one power transmission unit 2, power transmission coil units 3a to 3c, power reception coil units 4a to 4c, power reception units 5a to 5b, and capacitor units 6a to 6c. I have.

  Furthermore, display devices 8Aa to 8Da are provided in a power supply path formed by the power transmission unit 2, the power transmission coil unit 3a, the power reception coil unit 4a, the power reception unit 5a, and the capacitor unit 6a. 2, display devices 8 </ b> Ab to 8 </ b> Db are provided in a power supply path formed by the power transmission coil unit 3 b, the power reception coil unit 4 b, the power reception unit 5 b, and the capacitor unit 6 b. Display devices 8Ac to 8Dc are provided in a power feeding path formed by the coil unit 3c, the power receiving coil unit 4c, the power receiving unit 5c, and the capacitor unit 6c.

  In the example shown in FIG. 3, electric power is transmitted between the power transmission unit 2 and the capacitor unit 6a, and the lamps 82 are lit on all the display devices 8Aa, 8Ba, 8Ca, and 8Da provided between the units. ing. Similarly, electric power is transmitted between the power transmission unit 2 and the capacitor unit 6c, and the lamps 82 of all the display devices 8Ac, 8Bc, 8Cc, and 8Dc provided between the units are lit.

  On the other hand, power is not transmitted between the power transmission unit 2 and the power transmission coil unit 3b, and the capacitor unit 6b is not charged. Therefore, the lamps 82 are not lit in any of the display devices 8Ab, 8Bb, 8Cb, and 8Db provided between the units.

  In the example of FIG. 4, the modified wireless power feeding system 1 includes a plurality of configurations after the power receiving coil unit 4 with respect to one power transmission unit 2 and power transmission coil unit 3. Specifically, the wireless power feeding system 1 of the modification includes power receiving coil units 4a to 4c, power receiving units 5a to 5b, and capacitor units 6a to 6c for one power transmission unit 2 and power transmission coil unit 3. ing.

  Further, a display device 8 </ b> A is provided between the power transmission unit 2 and the power transmission coil unit 3. In addition, display devices 8Ba to 8Da are provided in a power feeding path formed by the power transmission coil unit 3, the power reception coil unit 4a, the power reception unit 5a, and the capacitor unit 6a. Display devices 8Bb to 8Db are provided in a power feeding path formed by the power receiving coil unit 4b, the power receiving unit 5b, and the capacitor unit 6b. The power transmitting coil unit 3, the power receiving coil unit 4c, and the power receiving unit 5c are provided. In addition, display devices 8Bc to 8Dc are provided in a power feeding path formed from the capacitor unit 6c.

  In the example shown in FIG. 4, electric power is transmitted between the power transmission unit 2 and the capacitor unit 6a, and the lamps 82 are lit on all the display devices 8A, 8Ba, 8Ca, and 8Da provided between the units. ing. Similarly, electric power is transmitted between the power transmission unit 2 and the capacitor unit 6c, and the lamps 82 are lit on all the display devices 8A, 8Bc, 8Cc, and 8Dc provided between the units.

  On the other hand, power is transmitted between the power transmission unit 2 and the power transmission coil unit 3, but power is not transmitted between the power transmission coil unit 3 and the power reception coil unit 4b, and the capacitor unit 6b is charged. Absent. Accordingly, the lamps 82 are not lit in any of the display devices 8Bb, 8Cb, and 8Db provided between the units.

  Thus, even when there are a plurality of power supply targets, the wireless power supply system 1 according to the present invention can visually check which unit is transmitting power.

  Each embodiment described above is for facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be changed / improved without departing from the spirit thereof, and the present invention includes equivalents thereof. In other words, those obtained by appropriately modifying the design of each embodiment by those skilled in the art are also included in the scope of the present invention as long as they include the features of the present invention. For example, each element included in each embodiment and its arrangement, material, condition, shape, size, and the like are not limited to those illustrated, and can be changed as appropriate. Also, each embodiment is an example and is different. Needless to say, partial replacement or combination of the configurations shown in the embodiments is possible, and these are also included in the scope of the present invention as long as they include the features of the present invention.

DESCRIPTION OF SYMBOLS 1 Wireless power supply system 2 Power transmission unit 3 Power transmission coil unit 4 Power reception coil unit 5 Power reception unit 6 Capacitor unit 7 Automated guided vehicle (AGV)
21 High-frequency power supply 22 Control unit 31 Power transmission unit 41 Power reception unit 51 Rectifier circuit 61 Electric double layer capacitor 62 DC-DC converter 8 Display device

Claims (3)

A power transmission unit having a power supply unit that outputs high-frequency power;
A power transmission coil unit that transmits high-frequency power supplied from the power supply unit;
A power receiving coil unit that is provided without being in contact with the power transmitting coil unit, and that receives high frequency power transmitted from the power transmitting coil unit;
A high-frequency power received by the power receiving coil unit is supplied to the automatic guided vehicle, and the power receiving unit charges the automatic guided vehicle;
Provided in a power feeding path formed from the power transmission unit, the power transmission coil unit, the power receiving coil unit, the power receiving unit, and the automatic guided vehicle, and predetermined when power is supplied to the power feeding path An indicator that displays
Wireless power supply system with   The wireless power feeding system according to claim 1, wherein a plurality of the indicators are provided in the power feeding path. A first coil provided around a cable connecting the power transmission unit and the power transmission coil unit;
A second coil provided between the power transmission coil unit and the power reception coil unit;
A third coil provided around a cable connecting the power receiving coil unit and the power receiving unit;
A fourth coil provided around a cable connecting the power receiving unit and the automatic guided vehicle; and
The plurality of indicators are:
The wireless power feeding system according to claim 2, wherein the wireless power feeding system is electrically connected to each of the first coil, the second coil, the third coil, and the fourth coil.