JP2023150571A - Non-contact power supply module and non-contact power supply system - Google Patents

Abstract

To provide a non-contact power supply module and a non-contact power supply system capable of easily implementing protective grounding of electric equipment, and capable of supplying power according to power consumption of the electric equipment.SOLUTION: A non-contact power supply module is installed on a power supply side of the non-contact power supply system, and provided with: a plurality of coils used for power transmission; a housing that accommodates the plurality of coils; and grounding parts placed in a state where surfaces connected to a grounding wire expose. Each of the plurality of coils can be independently controlled in energizing. The grounding parts are placed to surround the plurality of coils.SELECTED DRAWING: Figure 6A

Description

Application filed for application of Article 30, Paragraph 2 of the Patent Act (1) Website address https://www. jstage. jst. go. jp/article/jscas/23/4/23_152/_pdf/-char/ja https://www. jstage. jst. go. jp/article/jscas/23/4/23_209/_pdf/-char/ja Publication date: November 11, 2021 (2) Published in the Journal of the Japanese Society of Computerized Surgery, Volume 23, No. 4 Publication date: Reiwa 3 November 12, 2021 (3) Published at the 30th Japan Society of Computerized Surgery Conference Dates: November 21-23, 2021

The present invention relates to a contactless power supply module and a contactless power supply system for supplying power in a non-contact manner, and particularly relates to a technique suitable for supplying power to electrical equipment that requires protective grounding (for example, medical electrical equipment).

In recent years, in order to create a safe surgical environment in hospitals and other medical facilities, the use of cable-free medical electrical equipment installed in operating rooms, etc. is progressing, and the use of contactless power supply systems is being considered. . The contactless power supply system includes, for example, a power supply module having a power supply coil to which voltage is supplied from an AC power supply, and a power reception module having a power reception coil that is placed opposite to the power supply coil and magnetically coupled to the power supply coil, Power is supplied without contact using electromagnetic induction or magnetic field resonance (see, for example, Patent Documents 1 and 2). In this specification, the power feeding module and the power receiving module are collectively referred to as a "contactless power feeding module."

In operating rooms, etc., the floor surface should be flat from the viewpoints of ease of moving heavy objects such as operating tables and medical electrical equipment, prevention of stumbling by medical personnel, and ease of cleaning the floor surface. preferable. In addition, liquids such as disinfectant and blood may be splashed on the floor of an operating room or the like. Therefore, it is not suitable from the viewpoint of workability and safety to install a conventional power outlet on the floor, in which terminals serving as electrical contacts are exposed to the outside. On the other hand, in the case of a contactless power supply system, the power supply coil and the power receiving coil do not need to be exposed to the outside, so the power supply module can be installed while maintaining the flatness of the floor surface, and medical electrical equipment cable wiring can be simplified.

Japanese Patent Application Publication No. 2021-61706 International Publication No. 2019/189138

By the way, when applying a non-contact power supply system to medical electrical equipment, it is necessary to comply with the safety standard for medical electrical equipment (JIS T 0601-1) "Medical equipment - Part 1: General requirements regarding safety". Specifically, medical electrical equipment belonging to Class I is required to be equipped with a means for connecting to a medical ground terminal of a facility.

In the non-contact power feeding system disclosed in Patent Document 1, when feeding power with the feeding coil (20) and the receiving coil (50) facing each other, the grounded transparent plate (16) on the feeding side is connected to the transparent plate on the receiving side. (46) is brought into contact with the electrical equipment (100) to provide protective grounding. However, since the power feeding coil (20) and the transparent plate (16) are placed side by side, and the power receiving coil (50) and the transparent plate (46) are placed side by side, the arrangement of the medical electrical equipment is fixed. There are challenges in responding to various scenes. Specifically, it is not possible to flexibly change the arrangement of medical electrical equipment according to the surgical site of the patient and the position and angle that are convenient for the operator, and there is room for improvement in terms of convenience.

An object of the present invention is to provide a contactless power supply module and a contactless power supply system that can easily realize protective grounding of electrical equipment and can supply power according to the power consumption of the electrical equipment.

The contactless power supply module according to the present invention includes:
A contactless power transfer module provided on the power supply side of a contactless power transfer system,
Multiple coils used for power transmission,
a casing that accommodates a plurality of the coils;
a grounding part connected to the grounding wire and arranged with the surface exposed;
The plurality of coils are configured to be individually energized and controllable,
The ground portion is arranged to surround the plurality of coils.

The contactless power supply system according to the present invention includes:
A power supply module consisting of the above contactless power supply module,
A power receiving module,
A contactless power supply system comprising:
The power receiving module is
Coils used for power transmission,
a grounding part arranged with the surface exposed;
Power is transmitted in a state in which the ground portion of the power feeding module and the ground portion of the power receiving module are in contact with each other.

Advantageous Effects of Invention According to the present invention, it is possible to easily implement protective grounding of an electrical device, and to supply power according to the power consumption of the electrical device.

FIG. 1 is a diagram showing a schematic configuration of a contactless power supply system according to an embodiment. FIG. 2A is a cross-sectional view schematically showing the configuration of the power supply module. FIG. 2B is a plan view schematically showing the configuration of the power supply module. FIG. 3 is a circuit diagram showing an example of a power feeding circuit. FIG. 4A is a cross-sectional view showing an example of a power receiving module. FIG. 4B is a cross-sectional view showing an example of a power receiving module. FIG. 5A is a circuit diagram showing an example of a power receiving circuit. FIG. 5B is a circuit diagram showing an example of a power receiving circuit. FIG. 6A is a diagram showing how the contactless power supply system is used. FIG. 6B is a diagram showing how the contactless power supply system is used. FIG. 7 is a circuit diagram showing another example of the power receiving circuit. FIG. 8 is a circuit diagram showing another example of the power receiving circuit.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
FIG. 1 is a diagram showing a schematic configuration of a contactless power supply system 1 according to an embodiment. The contactless power supply system 1 is used, for example, to supply power to a device power supply 44 of a medical electrical device 45. The medical electrical equipment 45 is an electrical equipment belonging to class I, which requires protective grounding as defined in JIS T 0601-1.

As shown in FIG. 1, the contactless power feeding system 1 includes a power feeding module 10 including a power feeding coil 11 and a power receiving module 20 including a power receiving coil 21. The power supply module 10 is compatible with medical electrical equipment 45 whose power consumption is 100W, 600W, and 1500W, for example.

The power supply module 10 is buried in a floor F of an operating room or the like, for example, so as to surround an operating table. The power receiving module 20 is connected to a power cable 43 with a 3-pin plug of a medical electrical device 45 via a power receiving cable 41 and a power receiving circuit 42 . At the time of power feeding, the power receiving module 20 is placed on the power feeding module 10, and the power feeding coil 11 and the power receiving coil 21 are disposed facing each other with a distance between them.

In this embodiment, the power feeding coil 11 is connected to a power feeding circuit 32 via a power feeding cable 31. Similarly, the power receiving coil 21 is connected to a power receiving circuit 42 via a power receiving cable 41. Further, the power receiving circuit 42 is connected to a device power source 44 of the medical electrical equipment 45 via a power cable 43 with a 3-pin plug. Note that the power receiving circuit 42 has a socket structure that can be attached to and detached from a power cable 43 with a 3-pin plug.

For example, commercial power supplied from the AC power supply 33 is converted into a high-frequency AC voltage by the power supply circuit 32 (power supply unit 321), and is applied to the power supply coil 11. When an alternating current flows through the power feeding coil 11, a magnetic field is generated around the power feeding coil 11, and a potential difference (voltage) is generated in the power receiving coil 21 due to magnetic flux that interlinks with both the power feeding coil 11 and the power receiving coil 21. Then, an induced current flows through the power receiving coil 21, and power is supplied to the device power supply 44 of the medical electrical equipment 45 via the power receiving cable 41, the power receiving circuit 42, and the power cable 43 with a 3-pin plug.

2A is a sectional view of the power supply module 10, and FIG. 2B is a plan view of the power supply module 10 viewed from the open end side of the power supply side housing 13.

As shown in FIGS. 2A and 2B, the power supply module 10 includes a power supply coil 11, a power supply grounding ring 12, a power supply housing 13, a power supply magnetic shield 14, a power supply side protector 15, and the like.

The feeding coil 11 includes a first feeding coil 11A, a second feeding coil 11B, and a third feeding coil 11C. The first to third power feeding coils 11A to 11C are respectively annular spiral coils (also called pancake coils) in which electric wires are wound on the same plane with a predetermined number of turns. The first to third power feeding coils 11A to 11C are arranged concentrically in order from the inside.

When the power feeding coil 11 and the power receiving coil 21 are formed into an annular shape, even if the power receiving module 20 rotates, the opposing postures of the coils do not change, so positioning can be easily performed. Note that the shape of the power feeding coil 11 is not limited to an annular shape, and may be, for example, an oval shape (an oval shape or a racetrack shape). When the power feeding coil 11 and the power receiving coil 21 have an oval shape, if the straight parts of the coils face each other, even if a positional shift occurs in the longitudinal direction along the straight parts, a decrease in power transmission efficiency can be suppressed. I can do it.

As the electric wire forming the power feeding coil 11, for example, a Litz wire, which is a strand of a plurality of enamelled wires (strands) each having an insulating coating baked onto the conductor, is used. Terminal fittings (not shown) of the power line of the power supply cable 31 are connected to both ends of the power supply coil 11 by, for example, soldering.

The power supply side housing 13 is a bottomed cylinder having a recess 13a, and has, for example, a cylindrical shape. The power feeding side housing 13 accommodates the power feeding coil 11 and the power feeding side magnetic shield 14 in the recess 13a.

The power supply side housing 13 is made of, for example, a metal material such as aluminum. The power feeding side casing 13 is connected to, for example, a terminal fitting (not shown) of a grounding wire of the power feeding cable 31 and is grounded. In this case, the power feeding side housing 13 also functions as an electromagnetic shield that prevents radiation of electromagnetic waves to the outside and incidence of electromagnetic waves from the outside.

Note that the power feeding side casing 13 may be grounded via a power feeding side grounding wire provided separately from the power feeding cable 31. Further, when the magnetic shield of the power supply module 10 is provided separately from the power supply side housing 13, the power supply side housing 13 is made of fiber reinforced plastic (FRP) made of epoxy resin mixed with a filler (glass fiber etc.). It may be made of a resin material such as plastic. In this case, it is possible to prevent heat generation in the power supply side casing 13 due to induction heating, and further, to improve the heat dissipation of the power supply side casing 13 by using a material with good thermal conductivity as the FRP filler. You can also do it.

The power feeding side ground ring 12 includes a first power feeding side grounding ring 12A, a second power feeding side grounding ring 12B, and a third power feeding side grounding ring 12C. The first to third power supply grounding rings 12A to 12C are made of a conductive material. The first to third power feeding side grounding rings 12A to 12C each have an annular shape (for example, an annular shape) corresponding to the outer shape of the first to third power feeding coils 11A to 11C, and have their surfaces exposed. Placed.

The first power feeding side grounding ring 12A is arranged between the first power feeding coil 11A and the second power feeding coil 11B in plan view. The second power feeding side ground ring 12B is arranged between the second power feeding coil 11B and the third power feeding coil 11C in plan view. The third power feeding side grounding ring 12C is arranged outside the third power feeding coil 11C in plan view. The third power supply side grounding ring 12C is arranged, for example, at the open end of the recess 13a of the power supply side housing 13.

The power feeding side grounding ring 12 is grounded via the power feeding side grounding wire. The first power feeding side grounding ring 12A and the second power feeding side grounding ring 12B are connected to, for example, a grounding lead wire (code omitted) drawn out from the metal power feeding side casing 13, and are connected to the grounding lead wire and the power feeding side casing. It is grounded via 13. Further, the third power supply side grounding ring 12C is joined to the power supply side housing 13 and is grounded via the power supply side housing 13. Note that the third power feeding side grounding ring 12C only needs to have an annular shape as a whole, and may be partially divided.

The first power supply side ground ring 12A and the second power supply side ground ring 12B are formed of, for example, a nickel alloy such as Hastelloy (registered trademark). Thereby, the corrosion resistance of the first power supply side ground ring 12A and the second power supply side ground ring 12B exposed as the floor surface can be improved.

The third power supply side grounding ring 12C may be formed of the same material as the power supply side housing 13, or may be formed of a different material. When the third power supply side grounding ring 12C and the power supply side casing 13 are made of the same material, that is, when a part of the power supply side case 13 becomes the third power supply side grounding ring 12C, the number of parts is reduced. , the manufacturing process of the power supply module 10 is simplified, and manufacturing costs can be reduced.

When the third power supply side grounding ring 12C and the power supply side casing 13 are formed of different materials, materials suitable for realizing the respective functions can be selected. For example, by applying aluminum to the power feeding side casing 13 and applying a nickel alloy such as Hastelloy (registered trademark) to the third power feeding side grounding ring 12C, the weight of the power feeding side casing 13 can be reduced while exposing it as a floor surface. Corrosion resistance of the third power supply side grounding ring 12C can be improved.

The surfaces of the first to third power feeding side grounding rings 12A to 12C may have an uneven structure like the power receiving side grounding ring 22 described later, but from the viewpoint of ease of floor cleaning and trip prevention. Therefore, it is preferably flat.

The power feeding side magnetic shield 14 is arranged to cover the outer surface of the power feeding coil 11 (excluding the surface facing the power receiving coil 21). The power feeding side magnetic shield 14 has, for example, four concave chambers (numerals omitted) partitioned concentrically by partition walls 14a. For example, a communication coil (not shown), a first feeding coil 11A, a second feeding coil 11B, and a third feeding coil 11C are arranged in order from the inner recessed chamber.

The power feeding side magnetic shield 14 is made of a magnetic material such as ferrite, for example. By providing the power feeding side magnetic shield 14, a path with low magnetic resistance is formed, and as a result, the performance (Q value) of the power feeding coil 11 is improved and leakage magnetic flux is reduced. Therefore, the lines of magnetic force can be efficiently focused to improve power transmission efficiency, and the generation of noise can be suppressed. Further, by providing the power feeding side magnetic shield 14, heat generation in the metal power feeding side housing 13 can be suppressed.

The power supply side protector 15 fixes the power supply coil 11 and the power supply side magnetic shield 14 in the recess 13 a of the power supply side housing 13 . The power supply side protector 15 includes an insulating medium 151 (for example, epoxy resin) and a surface protection layer 152.

With the power feeding coil 11 and the power feeding magnetic shield 14 arranged in the recess 13a of the power feeding housing 13, an insulating medium 151 (e.g., epoxy resin) is filled and hardened to remove the power feeding coil 11 and the power feeding magnetic shield 14. The shield 14 is fixed in the recess 13a. The insulating medium 151 is recessed from the end surface of the third power supply side grounding ring 12C by the thickness of the surface protection layer 152 (for example, 2 mm). A first power feeding side grounding ring 12A and a second power feeding side grounding ring 12B are buried in the surface protection layer 152.

The surface protection layer 152 is formed on the open surface of the insulating medium 151 so as to be flush with the power supply side grounding ring 12 . The surface protection layer 152 protects the surface of the insulating medium 151 and forms the floor surface of the floor F on which the power supply module 10 is installed. The surface protection layer 152 is formed of, for example, a resin flooring material (for example, a vinyl chloride resin flooring material) having cushioning properties used in operating rooms and the like. The surface protection layer 152 is preferably formed of the same material as the floor material used for the floor on which the power supply module 10 is installed.

The power supply module 10 is installed on a floor F of an operating room or the like so that the power supply side grounding ring 12 and surface protection layer 152 of the power supply module 10 are flush with the floor F. Although the power feeding side grounding ring 12 is exposed on the surface, the flatness of the floor surface is ensured, so that it does not hinder the movement of heavy objects such as the medical electrical equipment 45.

FIG. 3 is a circuit diagram showing an example of the power supply circuit 32. As shown in FIG. As shown in FIG. 3, the power supply circuit 32 includes a power supply unit 321, a resonance capacitor 322, and the like.

The power supply unit 321 includes a communication section 323. The power feeding unit 321 energizes the corresponding power feeding coil 11 when the communication unit 323 detects a control signal from the power receiving module 20 .

In the power supply circuit 32, current paths of the first to third power supply coils 11A to 11C are provided independently to the power supply unit 321. The resonance capacitor 322 is connected in parallel to the first to third feeding coils 11A to 11C. The power supply unit 321 can individually control energization to the first to third power supply coils 11A to 11C.

4A and 4B are cross-sectional views showing an example of the power receiving module 20. The first power receiving module 20-1 shown in FIG. 4A is used, for example, as a power receiving head of a medical electrical device 45 whose power consumption is 100W. The second power receiving module 20-2 shown in FIG. 4B is used, for example, as a power receiving head of a medical electrical device 45 whose power consumption is 1500W.

As shown in FIGS. 4A and 4B, the first power receiving module 20-1 and the second power receiving module 20-2 have substantially the same configuration as the power feeding module 10. Among the descriptions of the first power receiving module 20-1 and the second power receiving module 20-2, components that are the same as or correspond to the power feeding module 10 will be briefly described.

The first power receiving module 20-1 and the second power receiving module 20-2 each include a power receiving coil 21, a power receiving side grounding ring 22, a power receiving side housing 23, a power receiving side magnetic shield 24, and the like.

The power receiving coil 21 is an annular spiral coil formed by winding an electric wire with a predetermined number of turns on the same plane. The shape of the power receiving coil 21 is basically the same as the shape of the power feeding coil 11. Terminal fittings (not shown) of the power line of the power receiving cable 41 are connected to both ends of the power receiving coil 21 by, for example, soldering.

The power receiving coil 21 of the first power receiving module 20-1 is configured with a first power receiving coil 21A corresponding to the first power feeding coil 11A of the power feeding module 10. The power receiving coil 21 of the second power receiving module 20-2 is composed of first to third power receiving coils 21A to 21C corresponding to the first to third power feeding coils 11A to 11C of the power feeding module 10.

The power receiving side housing 23 is a bottomed cylinder having a recess 23a, and has, for example, a cylindrical shape. The power receiving side housing 23 accommodates the power receiving coil 21 and the power receiving side magnetic shield 24 in the recess 23a.

The power receiving side housing 23 is made of, for example, a metal material such as aluminum. The power receiving side housing 23 is connected to, for example, a terminal fitting (not shown) of a grounding wire of the power receiving cable 41. In this case, the power receiving side housing 23 functions as an electromagnetic shield that prevents radiation of electromagnetic waves to the outside and prevention of incidence of electromagnetic waves from the outside.

In addition, when providing the electromagnetic shield of the power receiving module 20 separately, the power receiving side housing|casing 23 may be formed of resin materials, such as fiber reinforced plastic (FRP). In this case, it is possible to prevent heat generation in the power receiving side casing 23 due to induction heating, and further, by using a material with good thermal conductivity as the FRP filler, the heat dissipation performance of the power receiving side casing 23 can be improved. You can also do it.

The power receiving side grounding ring 22 is made of a conductive material and has an annular shape (for example, an annular shape) corresponding to the opening of the recess 23 a of the power receiving side housing 23 . The power receiving side grounding ring 22 is arranged along the opening of the recess 23a with its surface exposed. When the power receiving module 20 is placed on the power feeding module 10, the power receiving side grounding ring 22 comes into contact with the power feeding side grounding ring 12 and is grounded. In this embodiment, the power receiving cable 41 is connected to a metal power receiving side casing 23, and the ground wire of the power receiving cable 41 is grounded through the power receiving side casing 23. In this case, the power receiving side grounding ring 22 only needs to have an annular shape as a whole, and may be partially divided.

Specifically, the power receiving side grounding ring 22 of the first power receiving module 20-1 contacts the first power feeding side grounding ring 12A of the power feeding module 10 (see FIG. 6A). The power receiving side grounding ring 22 of the second power receiving module 20-2 contacts the third power feeding side grounding ring 12C of the power feeding module 10 (see FIG. 6B).

The power receiving side grounding ring 22 and the power receiving side housing 23 may be formed of the same type of material or may be formed of different types of materials. When the power receiving side grounding ring 22 and the power receiving side housing 23 are formed of the same material, that is, when a part of the power receiving side housing 23 becomes the power receiving side grounding ring 22, the number of parts is reduced, so the power receiving module 20 This simplifies the manufacturing process and reduces manufacturing costs.

When the power receiving side grounding ring 22 and the power receiving side casing 23 are formed of different materials, materials suitable for realizing the respective functions can be selected. For example, by applying aluminum to the power receiving side casing 23 and using a copper alloy with high conductivity and springiness (e.g. beryllium copper) to the power receiving side grounding ring 22, it is possible to reduce the weight of the power receiving side casing 23 while also grounding. Resistance can be efficiently reduced. Further, a plating layer made of Ni or the like may be formed on the surface of the power receiving side grounding ring 22 in order to improve corrosion resistance.

It is preferable that the power receiving side grounding ring 22 has an uneven structure on its surface. Since the power supply module 10 is installed on the floor and the power supply side ground ring 12 is exposed to the outside air, there is a possibility that an oxide film may be formed on the surface of the power supply side ground ring 12 over time. If an uneven structure is formed on the surface of the power receiving side grounding ring 22, when the power feeding side grounding ring 12 and the power receiving side grounding ring 22 come into contact, the oxide film formed on the power feeding side grounding ring 12 will be removed from the power receiving side grounding ring. Since it is destroyed by the uneven structure of 22, it is useful for ensuring good electrical continuity. Note that the contact area of the power receiving side grounding ring 22 is ensured such that the grounding resistance in the grounding path including the power receiving side grounding ring 22 is 10Ω or less.

Further, it is preferable that the power receiving side grounding ring 22 has a spring structure on its surface. In this case, when the power receiving module 20 is placed on the power feeding module 10, the spring structure is pressurized and deformed by the weight of the power receiving module 20. This ensures that the power feeding side grounding ring 12 and the power receiving side grounding ring 22 come into contact with each other and prevents grounding failure, which is useful for ensuring electrical continuity. For example, plate springs (so-called shield fingers (trade name)) arranged at equal intervals in the circumferential direction of the power receiving side grounding ring 22 can be applied to the spring structure.

The power receiving side magnetic shield 24 is arranged to cover the outer surface of the power receiving coil 21 (excluding the surface facing the power feeding coil 11). The power receiving side magnetic shield 24 of the first power receiving module 20-1 has, for example, two concave chambers (not shown) concentrically partitioned by a partition wall 24a. For example, a communication coil (not shown) and a first power receiving coil 21A are arranged in order from the inner recessed chamber. The power receiving side magnetic shield 24 of the second power receiving module 20-2 has, for example, four concave chambers (not shown) concentrically partitioned by a partition wall 24a. For example, a communication coil (not shown), a first power receiving coil 21A, a second power receiving coil 21B, and a third power receiving coil 21C are arranged in order from the inner concave chamber.

The power receiving side magnetic shield 24 is made of, for example, a magnetic material such as ferrite. By providing the power receiving side magnetic shield 24, a path with low magnetic resistance is formed, and as a result, the performance (Q value) of the power receiving coil 21 is improved and leakage magnetic flux is reduced. Therefore, the lines of magnetic force can be efficiently focused to improve power transmission efficiency, and the generation of noise can be suppressed. Further, heat generation in the metal power receiving side housing 23 can be suppressed.

The power receiving side protector 25 fixes the power receiving coil 21 and the power receiving side magnetic shield 24 in the recess 23 a of the power receiving side housing 23 . The power receiving side protector 25 is made of, for example, an insulating material such as epoxy resin.

With the power receiving coil 21 and the power receiving magnetic shield 24 arranged in the recess 23a of the power receiving housing 23, an insulating material is filled and hardened to form the power receiving side protector 25. The side magnetic shield 24 is fixed to the recess 23a. The power receiving side protector 25 is formed to be recessed from the end surface of the power receiving side grounding ring 22.

Although not shown in the drawings, for example, the power receiving module 20 used in the power receiving head of the medical electric machine 45 with power consumption of 600 W has a configuration including a first power receiving coil 21A and a second power receiving coil 21B.

5A and 5B are circuit diagrams showing an example of the power receiving circuit 42. 5A shows the power receiving circuit 42 of the first power receiving module 20-1, and FIG. 5B shows the power receiving circuit 42 of the second power receiving module 20-2.

As shown in FIGS. 5A and 5B, the power receiving circuit 42 includes a power receiving unit 421, a resonance capacitor 422, and the like.

The power receiving unit 421 includes a communication section 423. The power receiving unit 421 transmits a control signal to the power feeding module 10 via the communication unit 423, for example. Further, the power receiving unit 421 outputs the current from the power receiving coil 21 to the device power supply 44 .

In the power receiving circuit 42 of the first power receiving module 20-1, a resonance capacitor 422 is connected in parallel to the first power receiving coil 21A.

In the power receiving circuit 42 of the second power receiving module 20-2, the current paths of the first to third power receiving coils 21A to 21C are connected in series to the power receiving unit 421. The resonance capacitor 422 is connected in parallel to each of the first to third power receiving coils 21A to 21C. Note that the resonance capacitor 422 may be connected in series to the current paths of the first to third power receiving coils 21A to 21C. By connecting the first to third power receiving coils 21A to 21C in series, two power lines can be used to connect the first to third power receiving coils 21A to 21C and the power receiving unit 421.

6A and 6B are diagrams showing how the non-contact power supply system 1 is used. FIG. 6A shows the case where power is supplied to the first power receiving module 20-1, and FIG. 6B shows the case where power is supplied to the second power receiving module 20-2.

As shown in FIG. 6A, when feeding power from the power feeding module 10 to the first power receiving module 20-1, the first power receiving module is placed on top of the power feeding module 10 so that the first power feeding coil 11A and the first power receiving coil 21A face each other. Module 20-1 is placed.

When the first power receiving module 20-1 is placed on the power feeding module 10, the first power feeding side grounding ring 12A and the power receiving side grounding ring 22 come into contact with each other, and the first power feeding side grounding ring 12A and the power feeding side casing 13 The power receiving side grounding ring 22 is grounded via the power receiving side grounding ring 22 . The power receiving side grounding ring 22 is connected to the grounding wire of the power receiving cable 41 via the power receiving side housing 23, and the grounding wire of the power receiving cable 41 is connected to the grounding wire of the power cable 43 with a 3-pin plug via the power receiving circuit 42. Since the medical electrical equipment 45 is connected to the ground, the medical electrical equipment 45 is protectively grounded.

Control signals are transmitted and received between the communication unit 423 of the first power receiving module 20-1 and the communication unit 323 of the power feeding module 10, and it is confirmed that the first power receiving module 20-1 is placed on the power feeding module 10. When detected, the power supply unit 321 starts energizing the first power supply coil 11A. An induced current flows through the first power receiving coil 21A, and 100 W of power is supplied to the device power supply 44 of the medical electrical equipment 45 via the power receiving cable 41, the power receiving circuit 42, and the power cable 43 with a 3-pin plug.

As shown in FIG. 6B, when power is supplied from the power supply module 10 to the second power reception module 20-2, the first to third power supply coils 11A to 11C are opposed to the first to third power reception coils 21A to 21C. , a second power receiving module 20-2 is placed on top of the power feeding module 10.

When the second power receiving module 20-2 is placed on the power feeding module 10, the third power feeding side grounding ring 12C and the power receiving side grounding ring 22 come into contact with each other, and the third power feeding side grounding ring 12C and the power feeding side casing 13 The power receiving side grounding ring 22 is grounded via the power receiving side grounding ring 22 . The power receiving side grounding ring 22 is connected to the grounding wire of the power receiving cable 41 via the power receiving side housing 23, and the grounding wire of the power receiving cable 41 is connected to the grounding wire of the power cable 43 with a 3-pin plug via the power receiving circuit 42. Since the medical electrical equipment 45 is connected to the ground, the medical electrical equipment 45 is protectively grounded.

Control signals are transmitted and received between the communication unit 423 of the second power receiving module 20-2 and the communication unit 323 of the power feeding module 10, and it is confirmed that the second power receiving module 20-2 is placed on the power feeding module 10. When detected, the power supply unit 31 starts energizing the first to third power supply coils 11A to 11C. An induced current flows through the first to third power receiving coils 21A to 21C, and 1500 W of power is supplied to the device power supply 44 of the medical electrical equipment 45 via the power receiving cable 41, the power receiving circuit 42, and the power cable 43 with a 3-pin plug.

As described above, the power feeding module 10 (non-contact power feeding module) according to the embodiment is a non-contact power feeding module provided on the power feeding side of a non-contact power feeding system, and is a first to third power feeding module used for power transmission. A power feeding side housing 13 that accommodates the coils 11A to 11C (a plurality of coils), the first to third feeding coils 11A to 11C, and a power feeding side grounding ring 12 that is connected to a grounding wire and arranged with its surface exposed. (grounding part), the first to third power feeding coils 11A to 11C are configured to be individually energized, and the power feeding side grounding ring 12 surrounds the first to third feeding coils 11A to 11C. It is located in

Further, the contactless power supply system 1 includes a power supply module 10 and a power reception module 20. The power receiving module 20 includes a power receiving coil 21 used for power transmission, and a power receiving side grounding ring 22 (grounding part) disposed with its surface exposed. In the contactless power supply system 1, power is transmitted while the power supply side ground ring 12 of the power supply module 10 and the power reception side ground ring 22 of the power reception module 20 are in contact with each other.

According to the power feeding module 10 and the contactless power feeding system 1, when the power receiving module 20 is placed on the power feeding module 10, the power feeding side grounding ring 12 and the power receiving side grounding ring 22 come into contact with each other, so that the power receiving cable 41, etc. The ground wire of the power cable 43 with a 3-pin plug connected to the power receiving module 20 via the power receiving module 20 is grounded. Furthermore, since the first to third power supply coils 11A to 11C are configured to be individually energized controllable, it is possible to supply power according to the power consumption of the medical electrical equipment 45 to which the power receiving module 20 is connected. can. Therefore, protective grounding of class I equipment such as the medical electrical equipment 45 can be easily realized, and the convenience of the non-contact power supply system 1 is significantly improved. Further, since there is no need to increase the size of the housing in order to arrange the power supply side ground ring 12 and the power reception side ground ring 22, it is possible to downsize the power supply module 10 and the power reception module 20.

The power supply module 10 also includes first to third power supply ground rings 12A to 12C as power supply ground rings 12 (grounding portions), and the first to third power supply ground rings 12A to 12C are the first to third power supply ground rings 12A to 12C. It is arranged to surround each of the third power feeding coils 11A to 11C (a plurality of coils). As a result, the power receiving side grounding ring 22 for realizing protective grounding of the medical electrical equipment 45 can be provided close to the power receiving coil 21, so that the power receiving module 20 can be downsized.

Further, in the power supply module 10, the first to third power supply coils 11A to 11C and the first to third power supply side grounding rings 12A to 12C are arranged concentrically. As a result, when placing the power receiving module 20 on the power feeding module 10, it is possible to use the center of the power feeding side grounding ring 12 as a guide, and it is easy to align the power feeding coil 11 and the power receiving coil 21, which should be opposed to each other. It can be carried out.

In addition, in the power supply module 10, the housing 13 has conductivity, and the power supply side grounding ring 12 (grounding part) is arranged at least at the open end of the housing 13 and is physically and electrically connected to the housing 13. has been done. Thereby, protective grounding can be easily realized using the power feeding side housing 13, and an electromagnetic shield in the power feeding module 10 can be formed.

Further, the power feeding module 10 includes a power feeding unit 321 that controls energization to the first to third feeding coils 11A to 11C, and the first to third feeding coils 11A to 11C are independent from the feeding unit 321. connected. As a result, it is possible to individually control the power supply to the first to third power feeding coils 11A to 11C, and the number of power receiving coils 21 of the power receiving module 20 that is the target of power feeding, that is, the product power of the medical electrical equipment 45 can be controlled individually. Accordingly, power can be efficiently supplied.

As above, the invention made by the present inventor has been specifically explained based on the embodiments, but the present invention is not limited to the above embodiments, and can be modified without departing from the gist thereof.

For example, the number of power supply coils 11 provided in the power supply module 10 may be plural, and may be composed of two power supply coils 11 (for example, the first power supply coil 11A and the second power supply coil 11B), or may be composed of four or more power supply coils 11. The power feeding coil 11 may be configured as follows. When the number of power feeding coils 11 is increased, power can be fed to various medical electrical devices 45 having different power consumptions. Furthermore, it is also possible to improve the power supply efficiency by subdividing the applicable power consumption categories (for example, in 100W increments).

Further, in the embodiment, a case has been described in which the plurality of feeding coils 11 are arranged concentrically, but the plurality of feeding coils 11 may be arranged, for example, in a straight line or two-dimensionally in the vertical and horizontal directions. It's okay.

Further, as shown in FIG. 7, the power receiving circuit 42 of the second power receiving module 20-2 may include a rectifying and smoothing circuit 424. The rectifying and smoothing circuit 424 includes a diode bridge and smoothing capacitors C1' to C3'. Thereby, the DC outputs from the first to third power receiving coils 21A to 21C can be combined and extracted. In this case, as in the embodiment, the power supply wires connecting the first to third power receiving coils 21A to 21C and the power receiving unit 421 can be configured with two.

Further, as shown in FIG. 8, in the power receiving circuit 42 of the second power receiving module 20-2, the first to third power receiving coils 21A to 21C may be individually connected to the power receiving unit 421. In this case, the resonances in the current paths of the first to third power receiving coils 21A to 21C do not interfere with each other, so that the outputs from the first to third power receiving coils 21A to 21C can be extracted efficiently.

Further, for example, a brush portion such as a wire brush may be provided on the surface of the power receiving side grounding ring 22 of the power receiving module 20. Thereby, when the power receiving module 20 is placed on the power feeding module 10, dirt and oxide film on the surface of the power feeding side grounding ring 12 are removed, so that grounding failure can be efficiently prevented.

Further, the insulating material of the insulating medium 151 of the power feeding side protector 15 and the insulating material of the power receiving side protector 25 is not particularly limited as long as it can fix the power feeding coil 11 and the power receiving coil 21. For example, the insulating medium 151 of the power feeding side protector 15 and the insulating material of the power receiving side protector 25 may be formed of a resin material in which a filler is added to an epoxy resin. In this case, not only can the waterproof effect of the epoxy resin be obtained, but also the strength of the power supply module 10 and the power reception module 20 can be increased. Furthermore, when a filler with high heat dissipation properties is employed, the heat dissipation properties of the power feeding coil 11 and the power receiving coil 21 can be improved.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.

1 Non-contact power supply system 10 Power supply module 11, 11A to 11C Power supply coil 12, 12A to 12C Power supply side grounding ring (grounding part)
13 Power feeding side housing 14 Power feeding side magnetic shield 15 Power feeding side protector 20, 20-1, 20-2 Power receiving module 21, 21A to 21C Power receiving coil 22, 22A to 22C Power receiving side grounding ring (grounding part)
23 Power receiving side housing 24 Power receiving side magnetic shield 25 Power receiving side protector 31 Power supply cable 43 Power cable with 3-pin plug

Claims (6)

A contactless power transfer module provided on the power supply side of a contactless power transfer system,
Multiple coils used for power transmission,
a casing that accommodates a plurality of the coils;
a grounding part connected to the grounding wire and arranged with the surface exposed;
The plurality of coils are configured to be individually energized and controllable,
the grounding section is arranged to surround the plurality of coils;
Contactless power transfer module. comprising a plurality of the grounding parts,
The plurality of ground portions are arranged to surround each of the plurality of coils,
The contactless power supply module according to claim 1. The plurality of coils and the plurality of grounding parts are arranged concentrically,
The contactless power supply module according to claim 2. The casing has conductivity,
The grounding portion is disposed at least at an open end of the casing and is physically and electrically connected to the casing.
The contactless power supply module according to claim 1. comprising a power supply unit that controls energization of the plurality of coils,
The plurality of coils are each independently connected to the power supply unit,
The contactless power supply module according to claim 1. A power supply module comprising the contactless power supply module according to claim 1;
A power receiving module,
A contactless power supply system comprising:
The power receiving module is
Coils used for power transmission,
a grounding part arranged with the surface exposed;
Electric power is transmitted in a state where the ground portion of the power feeding module and the ground portion of the power receiving module are in contact with each other.
Contactless power supply system.