JP2019075947A - Non-contact power supply device - Google Patents

Abstract

To provide a non-contact power supply device capable of increasing a degree of coupling between a secondary coil and a resonant coil, reducing current leakage to reduce a reactive current, efficiently extracting power with a secondary coil, reducing a current flowing to the resonant coil to suppress heat generation, eliminating a complicated control, simplifying a configuration, and improving power supply efficiency.SOLUTION: A plurality of planar secondary coils 19, 20 in which spiral conductive patterns 27, 28 are formed around a core insertion hole 26 and a plurality of planar resonance coils 21 to 23 in which spiral conductive patterns 33 to 35 are formed around a core insertion hole 32 are alternately arranged on a common Π-shaped core 18. The planar secondary coils 19, 20 are connected in parallel. The planar resonant coils 21 to 23 are connected in series. Thereby, a secondary coil 14 and a resonant coil 15 of a power reception unit 16 are configured.SELECTED DRAWING: Figure 3

Description

The present invention relates to a non-contact power feeding apparatus for non-contact power supply (charging) to, for example, a carriage (for example, an AGV) traveling in a factory or a general road, or a battery of an automobile.

Conventionally, for example, in a factory or the like, a vehicle (car) that is powered by a battery needs to periodically charge the battery, stop the vehicle near the charger at a predetermined location, and use the connection cord to And the charger was connected to charge the battery. However, since it takes time to connect and disconnect the connection cord, for example, as shown in Patent Documents 1 to 3, power is supplied to the vehicle without contact.

Unexamined-Japanese-Patent No. 2005-94862 Unexamined-Japanese-Patent No. 2006-325350 WO 2006/022365 Patent No. 5707543 specification

However, as described in Patent Documents 1 to 3, when the resonant circuit is incorporated on the primary coil side or the secondary coil (pickup coil) side, there is a problem that a large current flows in the resonant circuit to generate heat.
Therefore, as shown in Patent Document 4, a contactless power supply device is proposed in which the resonance current of the secondary coil is controlled by using a switching element, and the secondary side resonance current is kept constant to suppress heat generation of the secondary side circuit. It is done.
However, in order to control the current on the secondary side, a device (control unit) for controlling the current constantly is required for all the carriages provided with the secondary side devices, which is not preferable economically.
The present invention has been made in view of such circumstances, and by increasing the degree of coupling between the secondary coil and the resonant coil, reducing current leakage and reducing reactive current, and efficiently extracting power with the secondary coil. It is possible to provide a non-contact power feeding device excellent in the efficiency of power supply which can reduce heat generation by reducing the current flowing to the resonance coil, does not require complicated control, and can simplify the configuration. To aim.

A non-contact power feeding device according to the present invention in accordance with the above object comprises a power feeding portion having a primary coil receiving power supply from a high frequency power source including an inverter, a power receiving portion having a secondary coil electromagnetically coupled to the primary coil and a resonant coil. A non-contact power feeding device that supplies power from the power feeding unit to the power receiving unit,
The secondary coil and the resonant coil are mounted on a common Π-shaped core, and the resonant coils are divided around the Π-shaped core and connected in series to a plurality of planar resonant coils connected in series And the secondary coil is disposed between the planar resonant coils which are wound and divided around the Π-shaped core.
Here, in the case where the resonance coil is divided into three or more and the secondary coil is divided into two or more, the divided secondary coils may be connected in parallel.
Alternatively, a plurality of planar resonant coils may be connected in parallel and further connected in series (ie, series-parallel).
In addition, the shape of "Π" means a square U-shape in which one ends of the opposing straight sides p and q are connected by a straight side r.

In the non-contact power feeding device according to the present invention, preferably, the secondary coil comprises an even number of planar secondary coils connected in parallel. Further, an intermediate tap can be provided to an even number of planar secondary coils connected in series, and an intermediate tap circuit type rectifier circuit can be connected. In addition, an intermediate | middle tap is not provided in a secondary coil, but a bridge type full wave rectifier circuit may be used for a rectifier circuit. In this case, the number of divided planar secondary coils may be odd.

In the non-contact power feeding device according to the present invention, each of the planar resonant coils is formed of a conductive pattern formed in a spiral shape on one side or both sides of a first substrate, and the conductive pattern is formed on the first substrate. It is preferable to form a core insertion hole through which the center portion of the hollow part is inserted and the U-shaped core is inserted.

In the non-contact power feeding device according to the present invention, each of the planar secondary coils is formed of a conductive pattern formed in a spiral shape on one side or both sides of a second substrate, and the second substrate is made of the conductive pattern. It is preferable to form a core insertion hole which penetrates the central portion of the pattern and through which the Π-shaped core is inserted.

In the non-contact power feeding device according to the present invention, preferably, an insulating material is disposed between the first substrate and the first and second substrates adjacent to each other. The insulating material is preferably made of a material capable of insulating between layers and allowing heat generated in the resonant coil or the secondary coil to be easily dissipated to the outside.

In the non-contact power feeding device according to the present invention, the power feeding unit includes a power feeding side control unit, and the power receiving unit includes a power receiving side control unit (including a rectification circuit) for charging a battery. First and second communication units for mutually communicating are respectively connected to the power receiving side control unit, and the power receiving side control unit is a voltage measuring means for measuring a charging voltage of the battery, and a charging current of the battery. Current measurement means for measuring, and measurement data of the charging voltage measured by the voltage measuring means and the charging current measured by the current measuring means from the second communication unit to the first communication unit The power supply control unit performs PWM control of the inverter based on the measurement data received by the first communication unit, and when the charge voltage is lower than a specified voltage, a constant current to the battery is supplied. Control, and When but becomes the prescribed voltage preferably has a charging control means for performing constant voltage control to the battery.

In the non-contact power feeding device according to the present invention, the power receiving side control unit has a thermometer that measures an operating temperature of the power receiving unit, and the measurement data of the operating temperature of the power receiving unit measured by the thermometer is The second communication unit transmits the first communication unit, and the power supply side control unit determines that the operating temperature of the power reception unit received by the first communication unit exceeds a predetermined temperature value set in advance. Sometimes, it is preferable to stop the operation of the inverter, reduce the output of the inverter, or shift the frequency of the inverter to a non-resonant frequency side.

In the non-contact power feeding device according to the present invention, the secondary coil and the resonant coil are mounted on a common Π-shaped core, and the resonant coils are divided and arranged around the Π-shaped core and connected in series. A plurality of planar resonant coils are provided, and the secondary coil is disposed between the planar resonant coils divided and wound around the Π-shaped core, thereby bringing the secondary coil and the resonant coil closer to each other. Since the degree of coupling can be increased, leakage of the magnetic field can be reduced to reduce the reactive current, and power can be efficiently extracted by the secondary coil. Further, since the resonant coil is formed of a planar resonant coil and the secondary coil is wound in a planar shape, the power receiving unit can be miniaturized and the heat dissipation can be secured.

And it is possible to increase the output by increasing the number of turns and the cross sectional area of the secondary coil and the resonant coil as needed, and also to cope with electric vehicles and other devices, for design freedom and versatility. Excellent. Furthermore, since the common core on which the secondary coil and the resonance coil are mounted is in a U-shape, the distance between the magnetic poles at both ends becomes long, so the power feeding unit (primary coil) and the power receiving unit (secondary coil) Even if the distance is long, the magnetic flux leakage can be suppressed to a small level, the efficiency of the power supply (charging) is unlikely to decrease, and the practicability is excellent.

When each planar resonance coil is formed of a conductive pattern formed in a spiral on one side or both sides of the first substrate, and the core insertion hole penetrating the central portion of the conductive pattern is formed on the first substrate The planar resonant coil can be easily attached to the Π-shaped core simply by inserting the Π-shaped core into the core insertion hole of each substrate, and the work of winding the coil around the core is unnecessary, and mass productivity is excellent. .
If the secondary coil consists of an even number of planar secondary coils connected in parallel, the impedance of the secondary coil can be lowered while increasing the current flowing through the secondary coil, so Even if a large current is taken out, heat generation can be suppressed. When the number of planar secondary coils is an even number, a center tap type rectifier circuit can be adopted to simplify the rectifier circuit, which is excellent in productivity.

Each planar secondary coil is formed of a conductive pattern formed in a spiral shape on one side or both sides of a second substrate, and a core insertion hole penetrating the center portion of the conductive pattern is formed in the second substrate In this case, the planar secondary coil can be easily attached to the Π-shaped core simply by inserting the Π-shaped core into the core insertion hole of each substrate, and the operation of winding the coil around the core is unnecessary, and mass productivity Excellent. In addition, since the planar secondary coil and the planar resonant coil are formed on the substrate, the distance between the two is narrowed to further increase the degree of coupling between the secondary coil and the resonant coil, thereby improving the power supply (charging) efficiency. be able to.
When an insulating material is disposed between the first substrate and the adjacent first and second substrates, the two should be brought close to each other while maintaining the insulation between the planar secondary coil and the planar resonant coil. And increase the degree of coupling between the secondary coil and the resonant coil, as well as miniaturizing the power receiving unit, and using an insulating material excellent in thermal conductivity, the heat dissipation from the resonant coil and the secondary coil is also possible. Increase.

The power receiving unit has a power receiving control unit, and the power feeding unit has a power receiving control unit for charging the battery, and the first and second communication units mutually communicate with the power receiving control unit and the power control unit. The power receiving side control unit includes a voltage measuring unit that measures the charging voltage of the battery and a current measuring unit that measures the charging current of the battery, and the charging voltage measured by the voltage measuring unit and the current measuring unit The measurement data of the measured charging current is transmitted from the second communication unit to the first communication unit, and the power supply side control unit performs PWM control of the inverter based on the measurement data received by the first communication unit, and charging is performed. When the voltage is lower than the specified voltage, constant current control to the battery is performed, and when the charge voltage becomes the specified voltage, the power supply side (primary side when the charge control means for performing constant voltage control to the battery is provided) See the voltage and current of the power receiving unit side (secondary side) in , It is possible to optimally control the output of the inverter, it is unnecessary to perform complicated control at the receiving unit, and simplify the configuration of the power receiving side controller, it is possible to spread the non-contact power feeding device.
The power receiving side control unit has a thermometer for measuring the operating temperature of the power receiving unit, transmits measurement data of the operating temperature of the power receiving unit measured by the thermometer from the second communication unit to the first communication unit, and feeds the power. When the operating temperature of the power receiving unit received by the first communication unit exceeds the preset specified temperature value, the side control unit stops the operation of the inverter, reduces the output of the inverter, or When shifting to the resonance frequency side, the charging operation can be stopped or the charging condition can be changed according to the temperature abnormality on the power reception side, and the safety is excellent.

FIG. 1 is a schematic block diagram of a non-contact power feeding device according to a first embodiment of the present invention. (A) and (B) are respectively a perspective view and a side view of the secondary coil and the resonance coil of the non-contact electric supply device. It is a perspective view which shows schematic structure of the secondary coil of the non-contact electric power supply apparatus, and a resonance coil. (A), (B), (C) is the left side view, front view, and right side view which show the modification of the planar secondary coil of the non-contact electric power supply apparatus and the planar resonant coil, respectively. It is a graph which shows the relationship of the charging current at the time of using the non-contact electric power supply same with time. It is explanatory drawing of a primary coil periphery of a non-contact electric power supply which concerns on the 2nd Embodiment of this invention, and a secondary coil and a resonant coil periphery.

Next, embodiments of the present invention will be described with reference to the attached drawings for understanding of the present invention.
Hereinafter, with reference to FIGS. 1 to 3, a non-contact power feeding device 10 according to a first embodiment of the present invention will be described.
As shown in FIG. 1, the non-contact power feeding device 10 includes a power feeding portion 13 having a primary coil 12 receiving power supply from a high frequency power source including an inverter 11, a secondary coil 14 electromagnetically coupled to the primary coil 12, and a resonant coil 15. The power supply unit 13 can supply power to the power reception unit 16, and the battery 17 connected to the power reception unit 16 can be charged in a contactless manner.
The non-contact power feeding device 10 can be used to charge various devices, but is suitably used to charge a transport carriage (for example, an AGV) or a car. In that case, the feeding unit 13 is provided in a fixed state on the floor, ceiling, or wall of the structure, and the carriage or car equipped with the power receiving unit 16 is moved horizontally (horizontally) with respect to the feeding unit 13 The secondary coil 14 and the resonant coil 15 of the power reception unit 16 can be charged with a gap immediately above, immediately below, or just beside the primary coil 12. In this embodiment, the present invention is applied to a transport carriage.

First, the details of the secondary coil 14 and the resonant coil 15 will be described.
As shown in FIG. 1 and FIGS. 2A and 2B, the secondary coil 14 and the resonant coil 15 are mounted on a common ferrite コ ア -shaped core 18. The secondary coil 14 and the resonant coil 15 respectively have an even number of planar secondary coils 19 and 20 and a plurality of planar resonant coils 21 to 23, and these planar secondary coils 19 and 20 The planar resonant coils 21 to 23 are alternately divided around the square-shaped core 18. Although the planar secondary coil is usually disposed between planar resonant coils, when the number of dispersedly disposed planar secondary coils is small, the planar secondary coil is disposed between adjacent planar resonant coils. In some cases, no secondary coil is disposed.

As shown in FIG. 3, the planar secondary coils 19 and 20 each have a rectangular core through which the Π-shaped core 18 is inserted through a substrate (second substrate, printed substrate) 24 or 25 such as a glass epoxy substrate. Holes 26 are formed, and conductive patterns 27 and 28 are formed spirally on one surface (front surface) of the substrates 24 and 25 with copper or the like centering on the core insertion holes 26, and the planar resonant coils 21 to 23 are A rectangular core insertion hole 32 through which the Π-shaped core 18 is inserted is formed in a substrate (first substrate, printed substrate) 29-31 such as a glass epoxy substrate, and the core is formed on one side (surface) of the substrate 29-31. The conductive patterns 33 to 35 are formed in a spiral shape of copper or the like with the insertion hole 32 as a center.

First, in order to connect the planar secondary coils 19 and 20 in parallel, through holes 36 and 37 electrically connected to the outer end and the inner end of the conductive patterns 27 and 28 are planarly viewed on the substrates 24 and 25. It is provided at the same position (overlapping position). Furthermore, through holes 38 are provided at predetermined positions of the substrates 24 and 25 at overlapping positions in plan view, and the through holes 37 and 38 are electrically connected by connection wires 39 on the back surface of the substrates 24 and 25. There is. Then, in the substrates 29, 30 of the planar resonant coils 21, 22 alternately arranged with the planar secondary coils 19, 20, through holes 40, 41 are provided at positions overlapping with the through holes 36, 38 in plan view. It is provided. Further, terminals 42 and 43 electrically connected to the through holes 40 and 41 are provided on the substrate 29 which is the outermost layer. Thereby, the planar secondary coils 19 and 20 can be connected in parallel in a state in which the planar secondary coils 19 and 20 and the planar resonant coils 21 to 23 are alternately arranged (laminated), and the substrate of the outermost layer Electrical connections can be easily made on terminals 29 using terminals 42 and 43.

Next, in order to connect planar resonance coils 21 to 23 in series, through hole 44 electrically connected to the inner end of conductive pattern 33 is provided on substrate 29, and the through provided at a predetermined position on substrate 29. The holes 45 and the back surface of the substrate 29 are electrically connected by connection wires 46. A through hole 47 electrically connected to the outer end of the conductive pattern 34 is provided on the substrate 30 at a position overlapping with the through hole 45 in plan view. Further, through hole 48 electrically connected to the inner end of conductive pattern 34 is provided in substrate 30, and through hole 49 provided at a predetermined position of substrate 30 is electrically connected with the back surface of substrate 30 by connection wire 50. There is. A through hole 51 electrically connected to the outer end of the conductive pattern 35 is provided on the substrate 31 at a position overlapping with the through hole 49 in plan view.

Furthermore, through holes 52 are provided in substrate 24 of planar secondary coil 19 at positions overlapping with through holes 45 and 47 in plan view, and substrate 25 of planar secondary coil 20 is viewed in plan. Through holes 53 are provided at positions overlapping the through holes 49 and 51.
Further, through hole 54 electrically connected to the inner end of conductive pattern 35 is provided in substrate 31 of planar resonance coil 23, and through hole 55 provided in a predetermined position of substrate 31 is connected with the back surface of substrate 31. It is electrically connected by a line 56. The through holes 57 are also provided at the positions overlapping the through holes 55 in the planar secondary coils 19 and 20 and the substrates 24 and 25 of the planar secondary coils 19 and 20 and the substrates 29 and 30 of the planar resonant coils 21 and 22 in plan view. . Further, terminals 58 and 59 electrically connected to the outer end of the conductive pattern 33 and the through holes 57 are formed on the substrate 29 which is the outermost layer. Thereby, while the planar secondary coils 19 and 20 and the planar resonant coils 21 to 23 are alternately arranged (laminated), the planar resonant coils 21 to 23 can be connected in series, and the outermost layer substrate 29 Electrical connections can easily be made using the terminals 58, 59 above. In this embodiment, the planar resonant coils and the planar secondary coils are stacked in a close contact state, but they may be stacked with a gap. In addition to the solder material, a metal wire can also be used as a conductor connecting through holes of each substrate (the same applies to the other embodiments).

When the substrates 24 and 25 and the substrates 29 to 31 are stacked, the respective substrates are insulated by an insulating material (not shown). The material of the insulating material can be appropriately selected, and for example, a Kapton film is suitably used. In addition, the thickness of the insulating material can be appropriately selected depending on the material of the insulating material and the voltage generated. For example, in the case of Kapton film, 20 kV can be insulated with a thickness of 25 μm.
In this manner, the degree of coupling between the secondary coil 14 and the resonant coil 15 is increased by alternately arranging the planar secondary coils 19 and 20 and the planar resonant coils 21 to 23 close to each other. Thus, the secondary coil 14 can efficiently extract power by reducing the reactive current. In addition, since the secondary coils 19 and 20 and the planar resonant coils 21 to 23 are alternately arranged, the same current flows through the secondary coil 14 and the resonant coil 15, so that the resonant coil 15 is more than the conventional one. It is possible to suppress the heat generation by reducing the current flowing to the Furthermore, by connecting the planar secondary coils 19 and 20 in parallel and connecting the planar resonant coils 21 to 23 in series, the impedance of the secondary coil 14 is increased while the current flowing through the secondary coil 14 is increased. Therefore, even if a large current is extracted from the secondary coil 14, heat generation can be suppressed.
Here, the number of planar secondary coils and planar resonant coils constituting the secondary coil and the resonant coil, the number of turns of the conductor pattern, the arrangement of the through holes, the take-out position of the terminal, etc. can be appropriately selected. . In addition, although the winding direction of the conducting-wire pattern which comprises a planar secondary coil and a planar resonant coil needs to be the same, it may be clockwise or counterclockwise.

Below, the modification of a planar secondary coil and a planar resonant coil is demonstrated. In the above embodiment, although the spiral conductive wire pattern is formed only on one side of the substrate, the spiral conductive wire pattern may be formed on both sides of the substrate.
As shown in FIGS. 4A, 4B, and 4C, in the planar coil 60, a core insertion hole 62 through which the Π-shaped core 18 is inserted is formed in a substrate 61 made of glass epoxy. The conductive patterns 63a and 63b in a spiral shape are formed of copper or the like centering on the core insertion hole 62 on both surfaces thereof. The conductive patterns 63a and 63b are continuously formed through the through holes 64 so that the winding direction is the same, and the number of turns can be increased as compared with the case where the conductor pattern is formed on only one side. Through holes 65 and 66 are provided at the outer ends of the conductive patterns 63a and 63b. Thus, both ends of the conductive patterns 63a and 63b constituting the planar coil 60 can be easily electrically connected in the substrate 61, and can be used as a planar secondary coil and a planar resonant coil. Not only one conductive pattern, but a plurality of conductive patterns may be arranged in parallel in a concentric spiral pattern. The thickness of the substrate 61 is, for example, about 2 to 5 mm, and the thickness of the conductive patterns 63a and 63b is, for example, about 0.5 to 3 mm.

Next, details of the power feeding unit 13 and the power receiving unit 16 will be described.
As shown in FIG. 1, the power supply unit 13 has a power supply side control unit 67, and the power reception unit 16 has a power reception side control unit 68 that charges the battery 17. As a power source of the power receiving side control unit 68, a battery of a transport carriage is used, and as a power source of the power feeding unit 13, a commercial power source is usually used.
The power supply side control unit 67 and the power reception side control unit 68 are connected to first and second communication units 69 and 70 that perform communication with each other. Here, although various communication signals can be used for communication by the first and second communication units 69 and 70, radio signals are preferable, and in particular, optical signals are suitably used. For example, in the case of using an optical signal, the power supply unit 13 and the power reception unit 16 can be provided by providing the light emitting unit (for example, LED) and the light receiving unit (for example, photodiode) in the first and second communication units 69 and 70, respectively. And can transmit and receive optical signals between them. When it is not necessary to transmit a signal from the first communication unit 69 to the second communication unit 70 and to transmit a signal from the second communication unit 70 to only the first communication unit 69, the first communication unit 69 can be configured to have only the reception function, and the second communication unit 70 can have only the transmission function. Thus, for example, in the case of using an optical signal, only the light receiving unit may be provided in the first communication unit 69, and only the light emitting unit may be provided in the second communication unit 70.

The power receiving side control unit 68 measures the operating temperature of the voltage measuring unit 71 that measures the charging voltage of the battery 17, the current measuring unit 72 that measures the charging current of the battery 17, and the power receiving unit 16 (in particular, the resonance coil 15). The measurement data of the charge voltage of the battery 17 measured by the voltage measurement means 71, the current measurement means 72, and the thermometer 73, the charge current, and the operating temperature of the power receiving unit 16 is second. The communication unit 70 transmits the first communication unit 69. At this time, the power reception side control unit 68 receives a signal of measurement data measured by the voltage measurement unit 71, the current measurement unit 72, and the thermometer 73 between the second communication unit 70 and the first communication unit 69. Signal processing means (for example, wireless signal processing means such as an optical signal processing means) 74 for converting (modulating) into communication signals that can be transmitted and received are provided. Further, the power supply side control unit 67 converts (demodulates) the communication signal transmitted from the second communication unit 70 and received by the first communication unit 69 to extract a signal of measurement data, and based on the measurement data Charge control means 75 for controlling the inverter 11 is provided.

The charge control means 75 performs constant current control on the battery 17 when the charge voltage is lower than the specified voltage, and performs constant voltage control on the battery 17 when the charge voltage becomes the specified voltage. At this time, it is preferable that the specified voltage is usually about 1.1 to 1.15 times the rated voltage of the battery, but the present invention is not limited to this number. Further, PWM control is suitably used as a control method of the inverter 11. The electric power of the inverter 11 is obtained by converting a commercial power supply (for example, three-phase alternating current) 76 into a direct current by the rectification circuit 77. The operating frequency of the inverter 11 is preferably about 20 to 100 kHz, which exceeds the audible frequency. However, for example, the frequency can be reduced to 85 kHz.

In the present embodiment, the resonance capacitor 78 is connected to the resonance coil 15 to constitute a resonance circuit, and the output of the secondary coil 15 is connected to the battery 17 which is a load via the rectifier 79. . Thereby, a large current can be supplied to the resonant coil 15, but the planar secondary coils 19 and 20 and the planar resonant coils 21 to 23 constituting the secondary coil 14 and the resonant coil 15 are alternately disposed, and Since the degree of coupling between the secondary coil 14 and the resonant coil 15 is high, the amount of magnetic flux passing through the secondary coil 14 and the resonant coil 15 becomes approximately the same, and the current flowing to the resonant coil 15 is reduced compared to the prior art. It is possible to increase the current flowing to the power source, efficiently extract the power, and efficiently charge the battery 17 in a short time. The resonant frequency of the resonant circuit is preferably larger than the oscillation frequency of the inverter 11, but can be reduced.

Next, the periphery of the primary coil 12 and the periphery of the secondary coil 14 and the resonant coil 15 will be described.
As shown in FIG. 1, the primary side core 80 around which the primary coil 12 is wound is a Π-shaped core made of ferrite similar to the secondary side. A litz wire is used for the primary coil 12.
Then, when the secondary coil 14 and the resonant coil 15 of the power receiving unit 16 are arranged with a gap with respect to the primary coil 12 of the power feeding unit 13 at the time of feeding, the end side magnetic pole portions 81 on both sides of the primary core 80, 82 and the end side magnetic pole parts 83 and 84 of the both sides of the secondary side square-shaped core 18 oppose each other.

In the conventional primary coil and secondary coil, an E-shaped core is used, but in the case of an E-shaped core, the central magnetic pole portions exist between the end side magnetic pole portions on both sides. The distance to the side pole portion is short, and magnetic flux leakage is likely to occur therebetween. Therefore, in order to charge efficiently with the conventional non-contact electric power feeding apparatus, the distance between the primary coil (power feeding unit) and the secondary coil (power receiving unit) had to be shortened. However, in the case of the Π-shaped core 18 of the present embodiment, since the central magnetic pole portion does not exist, the distance a between the primary side end magnetic pole portions 81 and 82 and the secondary side end magnetic pole portions 83 and 84 is If the distance b between the end-side magnetic pole portions 83 and 84 is shorter, no magnetic flux leakage occurs. That is, the distance between the end side magnetic pole portions 83 and 84 on both sides is longer than the distance between the central magnetic pole portion and the end side magnetic pole portion of the E-shaped core. Leakage of the magnetic flux between the end side magnetic pole portions 81 and 82 and the end side magnetic pole portions 83 and 84 is reduced, and the efficiency of charging is not easily lowered, which is excellent in practicability.

The number of turns of the primary coil 12, the secondary coil 14 and the resonant coil 15 can be appropriately selected according to the voltage (the required output) of the battery 17, etc. For example, the number of turns of the primary coil 12 When the number of turns is approximately 10 to 30 turns, the number of turns of the secondary coil 14 can be, for example, approximately 5 to 20 turns, and the number of turns of the resonant coil 15 can be approximately 10 to 50 turns. In this case, the current density of the current supplied to the coil is preferably about 1 to 2.5 A / mm ² , but in the case of forming the coil on the substrate, heat radiation is ensured, for example, 2.5 A mm ² or more (The same applies to the following embodiments).

Subsequently, the operation of the non-contact power feeding device 10 will be described.
As shown in FIG. 1, a transport carriage (for example, an AGV) having a power reception unit 16 is moved with respect to the power supply unit 13 installed at a predetermined position. At this time, a sensor (not shown) such as a proximity sensor is installed near the power feeding unit 13 or the power feeding unit 13, and the sensor that the power receiving unit 16 (transport carriage) has stopped within a predetermined range (position) When detected, the power feeding unit 13 and the power receiving unit 16 become operable, and the charging operation starts.
Next, the charging voltage and the charging current of the battery 17 are measured by the voltage measuring means 71 and the current measuring means 72, and the operating temperature of the power receiving unit 16 (resonance coil 15) is measured by the thermometer 73 The data (signal) is emitted from the second communication unit 70 to the outside as a communication signal through the signal processing means 74. The released communication signal is received by the first communication unit 69 and demodulated by the charge control means 75 into measurement data (signals).

As shown in FIG. 5, when the voltage (charging voltage V) detected by the voltage measuring means 71 is lower than the specified voltage (Vc), the constant current control (CC region) to the battery 17 is performed, and the voltage of the battery 17 is When the voltage becomes a specified voltage, constant voltage control (CV region) to the battery 17 is performed. The specified voltage is preferably in a range slightly higher (for example, about 5 to 15%) than the rated voltage (Vs) of the battery 17.
After the finishing charge (CV region) is completed, when a predetermined time of about 10 minutes (0 to 20 minutes is preferred) elapses, a signal indicating the completion of charging is received from the power receiving unit 16 (second communication unit 70) to the power feeding unit 13 (second communication unit 70). Then, the operation of the power feeding unit 13 and the power receiving unit 16 is stopped to complete the charging operation.
Note that after performing constant current control, the timer may be operated (that is, timer control) to perform constant voltage (charge) control to complete charge control.
In addition, when the charging voltage or the charging current to the battery 17 deviates from the normal value and is in an abnormal state (when the preset maximum voltage value or the maximum current value is exceeded), the power supply unit 13 (inverter 11) is stopped. , Alarm (lamp, bell, other signal) preferably. Furthermore, when the operating temperature of the power reception unit 16 (resonance coil 15) measured by the thermometer 73 exceeds a preset specified temperature value, the operation of the inverter 11 is stopped by a command of the power supply control unit 67. It is preferable to perform operations such as reducing the output of the inverter or shifting the frequency of the inverter to the non-resonant frequency side. At this time, a plurality of prescribed temperature values may be set, and the operation may be switched in stages according to the prescribed temperature values.

Next, the periphery of the primary coil of the noncontact power feeding device according to the second embodiment of the present invention, and the periphery of the secondary coil and the resonant coil will be described.
6, the secondary coil 85 and the resonant coil 86 according to the second embodiment are different from those according to the first embodiment in that a plurality of planar secondary coils 87 and 88 constituting the secondary coil 85 and Planar resonant coils 89 to 91 constituting the resonant coil 86 are formed by spirally winding a litz wire around the Π-shaped core 18. Here, although the planar secondary coils 87 and 88 and the planar resonant coils 89 to 91 are both wound in two layers for electrical connection, the present invention is not limited to this. The number of planar secondary coils and planar resonant coils constituting the secondary coil and the resonant coil can be appropriately selected. Further, the thickness and the number of turns of the litz wire forming the planar secondary coil and the planar resonant coil are appropriately selected according to the magnitude of the current flowing in each and the voltage of the battery 17 (required output). be able to.
In the present embodiment, the insulating material 92 in which the insulating layers are formed on both sides of the copper plate is disposed on both sides of the planar resonant coils 89 to 91. Thus, the insulation between the planar resonant coils 89 to 91 and the planar secondary coils 87 and 88 adjacent to each other is secured, and the heat dissipation is improved to prevent the temperature rise of the planar resonant coils 89 to 91. be able to.
The other configurations and operations are similar to those of the first embodiment, and thus the description thereof is omitted.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the structure as described in the above-mentioned embodiment in any way, It is considered within the range described in the claim. Other embodiments and modifications are also included.
For example, in the above embodiment, the ferrite Π-shaped core and the primary side core are used, but cores made of other materials having good high frequency characteristics and low iron loss (eddy current loss, hysteresis loss) are used You can also Alternatively, one of the planar secondary coil and the planar resonant coil may be formed on the substrate by a conductive pattern, and the other may be formed by a litz wire. Furthermore, a resonant coil can be provided also on the primary coil side.
In addition to radio waves, radio waves or ultrasonic waves can be used as medium means for signals in the first and second communication units.
Moreover, in the said embodiment, although the connection of the coil (conductive pattern) formed in each board | substrate is performed by the through hole, it can also carry out using a lead wire (for example, litz wire).

10: non-contact power feeding device, 11: inverter, 12: primary coil, 13: power feeding portion, 14: secondary coil, 15: resonant coil, 16: power receiving portion, 17: battery, 18: square core 19, 19 20: planar secondary coil, 21 to 23: planar resonant coil, 24, 25: substrate, 26: core insertion hole, 27, 28: conductive pattern, 29 to 31: substrate, 32: core insertion hole, 33 to 33 35: conductive pattern, 36 to 38: through hole, 39: connection line, 40, 41: through hole, 42, 43: terminal, 44, 45: through hole, 46: connection line, 47 to 49: through hole, 50 A connection wire, 51 to 55: through hole, 56: connection wire, 57: through hole, 58, 59: terminal, 60: planar coil, 61: substrate, 62: core insertion hole, 63a, 63b: conductive pattern, 64-6 : Through hole, 67: power supply side control unit, 68: power reception side control unit, 69, 70: first and second communication units, 71: voltage measurement means, 72: current measurement means, 73: thermometer, 74: Signal processing means 75: charge control means 76: commercial power supply 77: rectification circuit 78: resonance capacitor 79: rectifier 80: primary side core 81 to 84 end side magnetic pole part 85: secondary coil , 86: resonant coil, 87, 88: planar secondary coil, 89 to 91: planar resonant coil, 92: insulating material

Claims (7)

The power supply unit includes a power feeding unit having a primary coil that receives power supply from a high frequency power supply including an inverter, and a power receiving unit having a secondary coil and a resonant coil electromagnetically coupled to the primary coil. Contactless power supply device
The secondary coil and the resonant coil are mounted on a common Π-shaped core, and the resonant coils are divided around the Π-shaped core and connected in series to a plurality of planar resonant coils connected in series The non-contact power feeding device according to claim 1, wherein the secondary coil is disposed between the planar resonant coils divided and wound around the Π-shaped core. The noncontact power feeding device according to claim 1, wherein the secondary coil comprises an even number of planar secondary coils connected in parallel. The non-contact power feeding device according to claim 2, wherein each of the planar resonant coils is formed of a conductive pattern formed in a spiral shape on one side or both sides of a first substrate, and the first substrate is made of the conductive pattern. The non-contact electric power supply characterized by forming the core insertion hole which penetrates the central part of a pattern, and the said square-shaped core is penetrated. 4. The noncontact power feeding device according to claim 3, wherein each of the planar secondary coils is formed of a conductive pattern formed in a spiral shape on one side or both sides of a second substrate, and the second substrate The non-contact electric power supply characterized by forming the core penetration hole which penetrates the central part of an electric conduction pattern, and the above-mentioned U-shaped core is penetrated. 5. The noncontact power feeding device according to claim 4, wherein an insulating material is disposed between the first substrate and the first and second substrates adjacent to each other. The non-contact power feeding device according to any one of claims 1 to 5, wherein the power feeding unit has a power feeding side control unit, and the power receiving unit has a power receiving side control unit for charging a battery, and the power feeding side control unit First and second communication units that mutually communicate with each other are connected to the power receiving side control unit, and the power receiving side control unit is a voltage measuring unit that measures a charging voltage of the battery, and a charging current of the battery Current measurement means for measuring the charge voltage measured by the voltage measurement means, and measurement data of the charge current measured by the current measurement means from the second communication unit to the first communication unit And the power supply side control unit performs PWM control of the inverter based on the measurement data received by the first communication unit, and when the charge voltage is lower than a specified voltage, Perform current control, and When but becomes the prescribed voltage is a non-contact power feeding apparatus characterized by having a charging control means for performing constant voltage control to the battery. The non-contact power feeding device according to claim 6, wherein the power reception side control unit has a thermometer that measures an operating temperature of the power receiving unit, and measurement data of the operating temperature of the power receiving unit measured by the thermometer The second communication unit transmits to the first communication unit, and the power supply side control unit determines that the operating temperature of the power reception unit received by the first communication unit exceeds a preset specified temperature value. A non-contact power feeding device characterized in that the operation of the inverter is stopped, the output of the inverter is reduced, or the frequency of the inverter is shifted to a non-resonant frequency side.

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