JP7441750B2 - Wireless power supply system - Google Patents

Description

The present invention relates to a wireless power supply system.

Power supply rails and cable carriers (registered trademarks) are used to operate equipment including moving objects such as machine tools, automated warehouses, measuring instruments, and transport equipment. However, in equipment that uses power supply rails and cable carriers (registered trademark), maintenance is reduced due to particles generated by friction, dirt caused by lubricating to ensure smooth operation, and wire breakage caused by long-term use. It became.

Patent Document 1 discloses a transfer device that transfers a moving object using a contactless power supply facility. The transfer device of Patent Document 1 is a long-life transfer device that is easy to maintain, and has a power supply rail that flows a high-frequency sinusoidal current along a travel path on which a moving object runs. A non-contact power supply equipment is provided with a coil that resonates with the frequency of the sinusoidal current flowing through the device and generates an electromotive force. It has a built-in controller for each motor that drives the gripping, rotation, and lifting of the object, as well as a communication unit that detects the stop position of the moving object and communicates detection signals, and guides the moving object along the travel path. The belt is configured to transport the belt so that it can be stopped at any position in response to a signal from the communication unit.

Japanese Patent Application Publication No. 2000-135694

However, in the transfer device described in Patent Document 1, a current exceeding the capacity of the non-contact power supply equipment may flow due to startup of the driving motor or rush current during high load. At this time, the communication unit that is the control device may be reset, the memory that records the location and status of the equipment may be erased, or errors may occur. When such an abnormality occurs, the equipment cannot be restarted unless it is returned to its origin, resulting in products being processed being defective or requiring a great deal of effort to restart the equipment.

The present invention has been made in view of the current situation, and in a system that performs non-contact power supply between a fixed unit and a mobile unit, when a large current flows through a load such as a motor on the mobile unit side. However, the purpose of the present invention is to provide a wireless power supply system that can operate stably without causing system abnormalities.

The wireless power supply system of the present invention for solving the above problems includes:

(1) A non-contact power supply wireless operation system consisting of a fixed unit and a mobile unit,
The fixed unit includes a first control device, a first wireless device connected to the first control device, and a contactless power supply device,
The mobile unit includes a second wireless device, a second control device, a contactless power receiving device that receives power from the contactless power supply device, and a first power storage device, and A second control device communicates with the first wireless device via the second wireless device and includes an arithmetic circuit and an output stage,
The mobile unit further includes a first power line connected to the contactless power receiving device to supply power to the second wireless device and the arithmetic circuit, and a first power line connected to the contactless power receiving device to supply power to the output stage. a second power line that supplies power to the
The first power storage device is connected to the first power supply line and stores only the power of the first power supply line ,
The wireless power supply system is characterized in that the first power line and the second power line are separated from the stage of the wireless power receiving device .

According to the above invention, even if a large current flows through the load connected to the output stage of the mobile unit and the voltage of the second power line decreases, the first power line is not affected and the first power line is It is possible to provide a non-contact power supply wireless operation system that can avoid resetting the wireless device and the arithmetic circuit and losing data, and is less prone to system abnormalities.

Moreover, it is preferable that the non-contact power supply wireless operation system of the present invention has the following aspects.

(2) A wireless power supply system comprising a fixed unit and a mobile unit,
The fixed unit includes a first control device, a first wireless device connected to the first control device, and a contactless power supply device,
The mobile unit includes a second control device, a second wireless device, a contactless power reception device that receives power from the contactless power supply device, and a first power storage device, and A second control device communicates with the first wireless device via the second wireless device and has an arithmetic circuit and an output stage,
Furthermore, the mobile unit has a first power line connected to the contactless power receiving device to supply power to the second wireless device and the arithmetic circuit, and a first power line connected to the contactless power receiving device to supply power to the output stage. a second power line that supplies power to the
The first power storage device is connected to the first power supply line and stores only the power of the first power supply line,
A non-contact power supply wireless operating system, wherein a backflow prevention circuit is disposed between the non-contact power receiving device and the first power storage device of the first power supply line.

According to the above invention, the backflow prevention circuit can prevent current from flowing from the first power storage device to the second power supply line, and a voltage drop in the first power supply line can be more reliably prevented.

(3) The wireless power supply system according to (2), wherein the first power supply line further includes a stabilizing circuit after the first power storage device.

By having a stabilizing circuit after the first power storage device, power can be stably supplied to the second control device and the second wireless device with a simple structure even if there are fluctuations in the second power supply line. , it is possible to stabilize the first power supply line.

(4) The contactless power supply device has a first power supply circuit and a second power supply circuit,
The contactless power receiving device is
a first power receiving circuit coupled to the first power supply circuit and connected to the first power supply line;
a second power receiving circuit coupled to the second power supply circuit and connected to the second power supply line;
The non-contact power supply wireless operation system according to (1), comprising:

By separating the first power supply line and the second power supply line from the power receiving circuit, it is possible to easily eliminate the influence of voltage fluctuations in the second power supply line on the first power supply line.

(5) The contactless power receiving device is
a first power receiving circuit connected to the first power supply line;
a second power receiving circuit connected to the second power supply line,
The contactless power supply wireless operation system according to (1), wherein the power receiving circuits coupled to the contactless power supply device are alternately replaced.

According to the above invention, power can be efficiently supplied to the first power line and the second power line from one power supply device.

(6) The wireless power supply system according to (5), wherein the first power receiving circuit and the second power receiving circuit are arranged along the moving direction of the mobile unit.

According to the above invention, since the power receiving circuits are lined up along the moving direction of the power receiving unit, the power supply side can be easily replaced as the power receiving unit moves.

(7) The contactless power supply device has a power transmission coil, the contactless power reception device has a power reception coil, and the contactless power supply device and the contactless power reception device are coupled by magnetic coupling. The wireless power supply system according to any one of (1) to (6).

According to the above invention, since the power feeding device and the power receiving device are coupled using magnetic coupling, a large amount of power can be transmitted at a low frequency of 200 kHz or less, and the influence of spurious emission can be reduced.

(8) The wireless power supply system according to any one of (1) to (7), wherein the second power supply line is provided with a second power storage device.

According to the above invention, power can be supplied to the load regardless of whether or not power is supplied to the second power line, so that the load can be stably operated. This is particularly effective for the invention according to (5) where there are times when power is not supplied.

(9) The wireless power supply system according to any one of (1) to (8), wherein the control device includes a sensor, and the sensor is connected to the arithmetic circuit.

According to the above invention, since the control device includes the sensor and the sensor is connected to the arithmetic circuit, it is possible to accurately control the load such as the motor based on the position, state, etc. of the mobile unit.

(10) According to any one of (1) to (9), the non-contact power supply wireless operation system is any one of an automatic transport device, a processing machine, an automatic warehouse, a robot, a measuring instrument, and a machine tool. The described contactless power supply wireless actuation system.

According to the above invention, since the arithmetic circuit and the wireless device can be stably operated, it is possible to provide a system that is less prone to system abnormalities and has good maintainability.

The contactless power supply wireless operation system of the present invention is a system that performs contactless power supply between a fixed unit and a mobile unit. Compared to conventional systems involving mobile objects that require contact-type power supply or cable power supply, maintenance is easier and easier.

In the wireless power supply system of the present invention, the mobile unit is equipped with a first power line that supplies power to the arithmetic circuit of the control device and a second power line that supplies power to the load from the output stage. Even if a large current flows through the second power supply line due to startup or the like, voltage fluctuations in the first power supply line, which is the control side, can be suppressed. As a result, the risk of system abnormality occurring in the control device or wireless device of the mobile unit is prevented, and the system can be operated stably.

1 is a block diagram of a wireless power supply system according to a first embodiment of the present invention; FIG. FIG. 2 is a block diagram of a wireless power supply system according to a second embodiment of the present invention. FIG. 3 is a block diagram of a wireless power supply system according to Embodiment 3 of the present invention. FIG. 3 is a block diagram of a wireless power supply system according to a fourth embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of an automatic transport device using the non-contact power supply wireless operation system of the present invention, in which (a) schematically shows the overall structure of the automatic transport device, and (b) shows a cart as a moving unit. FIG. 2 is an explanatory diagram of an XY table using the wireless power supply system of the present invention. FIG. 2 is a circuit diagram of an example of a mobile unit of the wireless power supply system according to Embodiment 1 of the present invention. FIG. 7 is a circuit diagram of an example of a mobile unit of the wireless power supply system according to Embodiment 3 of the present invention. 12 shows a modification of the output stage of the first embodiment, in which (a) shows an output stage using transistors, (b) shows an output stage using relays, and (c) shows a three-phase inverter circuit using IGBTs. A combination of a contactless power supply device and a contactless power reception device of the contactless power supply wireless operation system of the present invention is shown, in which (a) both use one circular coil, and (b) both use two circular coils. (c) uses a core in the coil of a non-contact power receiving device, (d) uses a combination of an oval power feeding coil and a circular power receiving coil, (e) uses multiple power feeding coils, and one This shows a combination of two receiving coils.

Embodiments 1 to 4 of the wireless power supply system of the present invention will be described with reference to the drawings.

<Embodiment 1>
FIG. 1 is a block diagram of a wireless power supply system according to a first embodiment of the present invention. The contactless power supply wireless operation system includes one or more fixed units 1 and one or more mobile units 2. In FIG. 1, only one fixed unit 1 and one mobile unit 2 are shown for the sake of simplicity. The fixed unit 1 includes a first control device 11, a first wireless device 12 connected to the first control device 11 via a wired or wireless communication line, and a non-contact power supply device 13. The mobile unit 2 includes a second control device 21 , a second wireless device 22 , a contactless power receiving device 23 , and a first power storage device 24 . The second control device 21 includes an arithmetic circuit 211 and an output stage 212. Output stage 212 is connected to load 27 . In this embodiment, the load 27 is a motor that moves the moving unit 2.

The mobile unit 2 further includes a first power line 28 and a second power line 29. The first power line 28 and the second power line 29 are connected to the contactless power receiving device 23, and the power obtained by the contactless power receiving device 23 is transmitted to the first power line 28 and the second power line 29. distributed. The first power supply line provides power for the second wireless device 22 and the arithmetic circuit 211 of the control device 21 . The second power supply line 29 supplies power to the output stage 212 of the second control device 21 .

The non-contact power supply device 13 on the fixed unit 1 side includes one system of non-contact power supply circuits. The non-contact power receiving device 23 on the mobile unit 2 side also includes one system of non-contact power receiving circuits. The contactless power supply device 13 and the contactless power reception device 23 each have a coil.

Power is supplied by magnetic coupling between the contactless power supply device 13 on the fixed unit 1 side and the contactless power reception device 23 on the mobile unit 2. Although the method of non-contact power supply is not particularly limited, it is preferably inductively coupled type (electromagnetic induction method or magnetic resonance method) non-contact power supply using magnetic field coupling.

FIGS. 10(a), 10(c), 10(d), and 10(e) show examples of combinations of coils used in the contactless power supply device 13 and the contactless power receiving device 23 of this embodiment. FIG. 10A shows an example of a combination in which one circular coil 52 is used for both the contactless power supply device 13 and the contactless power reception device 23. FIG. 10C shows an example of a combination in which a ferrite core is used for the coil 53 of the non-contact power receiving device 23. FIG. 10D shows an example in which an oval power feeding coil 54 is applied to the non-contact power feeding device 13, and a circular power receiving coil 52 is combined to the non-contact power receiving device 23. FIG. 10E shows an example in which a plurality of power feeding coils 52 and one power receiving coil 52 are combined.

With the combination of coils 52 shown in FIG. 10(a), power can only be supplied to the mobile unit 2 at a specific position. On the other hand, in FIG. 10D, by using the oval coil 54 for the contactless power supply device 13 and the contactless power reception device 23, magnetic coupling can be carried out at all times, and the load can be operated at all times. Note that by using a ferrite core inside the circular coil 53 as shown in FIG. 10(c), the number of turns of the coil can be reduced. Furthermore, by appropriately adjusting the size of the core relative to the coil 53, it is possible to improve the power transmission efficiency when the coil 53 is misaligned.

FIG. 7 shows an example of a circuit diagram of the mobile unit 2. The non-contact power receiving device 23 consists of a power receiving circuit including a coil. A backflow prevention circuit 26 and a first power storage device 24 are connected to the first power supply line 28 after the non-contact power receiving device 23 . A backflow prevention circuit 26 is arranged between the non-contact power receiving device 23 and the first power storage device 24 of the first power supply line 28, and a stabilizing circuit 41 is arranged after the first power storage device 24. The voltage is stabilized. The first power line 28 supplies DC power to the second wireless device 22 and the arithmetic circuit 211 .

In this embodiment, the backflow prevention circuit 26 is configured by an FET (Field Effect Transistor). By configuring the backflow prevention circuit 26 with a FET that has a small ON resistance and can reduce the voltage drop between V _{and DS} , the output voltage of the non-contact power receiving device can be reduced. However, the elements applicable to the backflow prevention circuit 26 are not limited to FETs, but may include diodes, DD converters, linear chargers, etc. that have the function of cutting off the power of the first power storage device going to the second power supply line. For example, the type of element is not particularly limited.

Information is exchanged between the first wireless device 12 of the fixed unit 1 and the second wireless device 22 of the mobile unit 2 by wireless communication. As a communication method, any wireless communication method can be used, such as communication between a wireless LAN base station and a wireless LAN terminal, communication between a mobile phone base station and a communication module, or communication between wireless microcomputer modules. Further, the second control device 21 of the mobile unit 2 is connected to a second wireless device 22 via a wired or wireless communication line 51, and the second control device 21 of the fixed unit 1 is connected to a second wireless device 22 via a wired or wireless communication line 51. Communicate with wireless device 12.

The arithmetic circuit 211 of the second control device 21 transmits a control signal to the output stage 212 to control the power supplied to the load 27 . Output stage 212 can be configured with a FET. FIG. 7 shows an output stage 212 using a MOS-FET as an example, but there are also inverter circuits using transistors (FIG. 9(a)), relays (FIG. 9(b)), and IGBTs. (FIG. 9(c)) etc. can be applied to the output stage 212.

In this embodiment, a control signal issued from the first control device 11 to the motor of the load 27 is transmitted from the first wireless device to the second control device 21 via the second wireless device 22. The signal is input and converted by the arithmetic circuit 211 into a control signal for operating the motor. This control signal is transmitted to output stage 212. The FET of the output stage 212 controls the supply of electric power, thereby controlling the operation of the motor and controlling the movement of the entire moving unit 2. That is, the output stage 212 supplies the power supplied from the second power supply line 29 to the load 27 at a current value and timing specified by the control signal of the first control device 11.

In this embodiment, a stabilizing circuit 41 is provided after the first power storage device 24 on the first power supply line.
For example, if the second control device 21 whose input voltage range is 4 to 5.5V is designed to supply a voltage of 5V, and the output voltage of the non-contact power receiving device 23 is designed to be 10V or more, which is 1V or more higher. explain.
The output from the non-contact power receiving device 23 is directly connected to the second power supply line 29 that connects to the motor that is the load, the backflow prevention circuit 26, and the stabilization circuit 41 to the second wireless device 22 and the second control device. It is divided into a first power supply line 28 connected to 21. In the second power supply line 29, a large current flows during startup of the motor and under heavy load, causing the voltage to drop and fluctuate. On the other hand, the first power supply line 28 charges the first power storage device 24 through the backflow prevention circuit 26, is further stabilized by the stabilization circuit 41, and is then charged to the second wireless device 22 and the second control device 21. Since it is supplied, stable control is possible.
Note that this configuration is particularly effective when using a power storage device that stores power in accordance with voltage, such as an electric double layer capacitor or an electrolytic capacitor. Such power storage devices have a long lifespan and are highly reliable, but their voltage drops as they discharge, making this configuration difficult to use as a power source for ICs with narrow input voltage ranges. is particularly effective.
In the second power supply line 28, for example, in a stable state, the output voltage of the non-contact power receiving device 23 is reduced by 1V from the output voltage of 10V by the backflow prevention circuit 26, and by 4V by the stabilization circuit 41, and the stabilized voltage of 5V is supplied to the second power supply line 28. control device 21 and second wireless device 22. At this time, a voltage of 9V is applied to the first power storage device 24, which is a large-capacity electrolytic capacitor.
When the motor is loaded and the output voltage of the non-contact power receiving device 23 drops to, for example, 3V, the backflow prevention circuit 26 prevents the electrical energy of the first power storage device 24 from flowing out to the second power supply line. The electrical energy stored in the first power storage device 24 is supplied to the second control device 21 and the second wireless device 22 through the stabilization circuit 41. Initially, the first power storage device 24 supplies a voltage of 9V, but the voltage gradually decreases as the power is discharged. In this embodiment, since the stabilizing circuit 41 is provided after the first power storage device 24, even if the voltage of the first power storage device 24 decreases, the second control device 21 and the second power storage device 24 can be stably controlled. The wireless device 22 can be operated, providing a simple and reliable contactless wireless operation system.
It is preferable that the potential difference of the stabilizing circuit 41 is 1V or more. The potential difference in the stabilizing circuit 41 causes energy loss, but the electrical energy consumed by the second wireless device 22 and the second control device 21 in the first power supply line 28 is small, so heat generation does not become a problem. Rather, by designing the potential difference applied to the stabilizing circuit 41 to be large, reliability can be improved when a voltage drop in the non-contact power receiving device 23 occurs.

In this embodiment, no power storage device is disposed on the second power supply line 29. Therefore, the load 27 can only operate while non-contact power supply is being performed, but on the other hand, if non-contact power supply is being performed at all times, the load can be operated at all times.

The second power supply line 29 in this embodiment has a structure in which voltage fluctuation occurs due to movement of the mobile unit 2 or activation of the load 27. However, by disposing the backflow prevention circuit 26 in the first power supply line 28, the first power supply line 28 can always maintain a constant voltage. As a result, resets and malfunctions of the arithmetic circuit 211 of the second control device 21 and the second wireless device 22 are less likely to occur, making it possible to provide a system with good maintainability that suppresses the occurrence of defects. can.

<Embodiment 2>
FIG. 2 shows a block diagram of a wireless power supply system according to a second embodiment of the present invention. Duplicate explanations of elements having the same configuration as in Embodiment 1 will be omitted. In the non-contact power supply wireless operation system of this embodiment, the fixed unit 3 includes one system of the non-contact power supply device 13, and the mobile unit 4 includes one system of the non-contact power receiving device 23. Electric power obtained by the non-contact power receiving device 23 is distributed to a first power line 28 and a second power line 29. A backflow prevention circuit 26 and a first power storage device 24 are connected to the first power supply line 28 side after the non-contact power receiving device 23 . The first power supply line 28 supplies power to the second wireless device 22 and the arithmetic circuit 211 of the second control device 21 .

In this embodiment, a second power storage device 25 is connected between the contactless power receiving device 23 and the output stage 212 of the second power supply line 29 . By storing power in the second power storage device 25, power can be supplied to the load 27 while power is not being sent from the non-contact power supply device 13.

The load 27 of the mobile unit 4 typically consumes more power than the second control device 21 and the second radio device 22. For this reason, it is preferable to use a second power storage device 25 that supplies power to the load 27 that can handle larger fluctuations in voltage than the first power storage device 24 and has a larger capacity. In the present invention, since the first power storage device 24 and the second power storage device are arranged on different power supply lines and separated from each other, the first power storage device 24 supplies power to the second power supply line 29. do not. Therefore, even if a power storage device with a small capacity is used as the first power storage device 24, the power for the second wireless device 22 and the second control device 21 can be stably provided. Note that the output stage 212 is related to both the first power line 28 and the second power line 29, and functions to control the current of the second power line 29 based on the control signal on the first power line 28 side. doing. However, since the load 27 consumes only a small amount of power on the first power line 28, even if the load 27 is controlled by the output stage 212, the voltage on the first power line 28 side is not affected.

When FETs, thyristors, and IGBTs are used in the output stage 212, since switching is performed using gate voltages, fluctuations in the voltage applied to the first power supply line can be reduced depending on the magnitude of the current supplied to the load 27. Furthermore, when a relay is used in the output stage 212, since the relay opens and closes the contacts using the current flowing through the coil, the influence of the magnitude of the current supplied to the load 27 on the first power supply line can be reduced.

Further, in this embodiment, the second control device 21 includes a sensor 213. Examples of the sensor 213 include, but are not limited to, an encoder that confirms the position, a photoelectric sensor, a satellite positioning system, a photoelectric sensor that counts the rotation of the spindle, the temperature inside and around the mobile unit 4, light, voltage, and current. Any detector can be connected, such as a sensor that continuously monitors the Also, multiple sensors of the same or different types can be connected. The data input from the sensor 213 becomes an important information source for controlling the movement of the entire wireless power supply system.

In such a sensor 213, data loss occurs when the power is cut off. Misalignment in encoders and reading errors in photoelectric sensors that monitor position and rotation can cause malfunctions. In addition, in a sensor that continuously monitors data, data is lost during this period, and, for example, in a protection circuit that monitors current, when an inrush current occurs, this causes a problem that the protection circuit cannot operate normally. However, in this embodiment, since the sensor 213 is supplied with power from the first power line 28, it is not affected by fluctuations in the power of the second power line 29 and can stably detect various data. be able to.

According to the present embodiment, as in the first embodiment, the second power supply line 29 has a structure in which voltage fluctuation occurs due to movement of the mobile unit 4 or activation of the load 27. However, by providing the backflow prevention circuit 26, the first power supply line 28 can always maintain a constant voltage, which makes it difficult to reset the arithmetic circuit 211, read errors in the sensor 213, etc., and is easy to maintain. system can be provided.

<Embodiment 3>
FIG. 3 is a block diagram of a wireless power supply system according to Embodiment 3 of the present invention.

In the third embodiment, the contactless power supply device 13 of the fixed unit 5 includes a first power supply circuit 131 and a second power supply circuit 132. The contactless power receiving device 23 of the mobile unit 6 also includes a first power receiving circuit 231 connected to the first power line 28 and a second power receiving circuit 232 connected to the second power line 29. There is. The first power receiving circuit 231 is coupled to the first power feeding circuit 131. The second power receiving circuit 232 is coupled to the second power feeding circuit 132. In this embodiment, the backflow prevention circuit is not an essential component. In this embodiment, the first power line 28 and the second power line 29 are separated from the stage inside the non-contact power receiving device 23, so that voltage fluctuations do not affect each other.

FIG. 10(b) shows the arrangement of the coils 52 of the contactless power supply device 13 and the contactless power reception device 23 of this embodiment. The coil 52 of the first power feeding circuit 131 and the coil 52 of the first power receiving circuit 231 form a pair, and the coil 52 of the second power feeding circuit 132 and the coil 52 of the second power receiving circuit 232 form a pair. There is. Although the coils 52 in FIG. 10(b) are lined up along the moving direction of the moving unit 6, they may be lined up perpendicularly to the moving unit 6 as a modification.

FIG. 8 shows an example of a circuit diagram of the mobile unit 6. The first power receiving circuit 231 and the second power receiving circuit 232 each include a power receiving circuit having a coil. In this embodiment, a one-chip microcomputer in which the second wireless device 22 and the arithmetic circuit 211 are integrated is used. Linear charger 42 is connected between first power receiving circuit 231 of first power supply line 28 and first power storage device 24, and charges first power storage device 24 by receiving DC voltage. A DC/DC converter 43 is connected to the output side of the first power storage device 24, and supplies stabilized DC power to the second wireless device 22, the arithmetic circuit 211, and the sensor 213 according to their respective ratings. do. Further, a linear charger 42 that can handle a larger current capacity is arranged on the second power supply line 29 to charge the second power storage device 25. The output stage 212 is composed of FETs as in the first embodiment, and uses a photocoupler with a built-in phototransistor as a gate voltage control element of the FETs. With this structure, the first power line 28 and the second power line 29 are isolated using a photocoupler.
Note that in this embodiment, a lithium ion secondary battery is used for both the first power storage device and the second power storage device. A linear charger is used to properly charge the lithium-ion secondary battery. Further, a one-chip microcomputer in which the second wireless device 22 and the arithmetic circuit 211 are integrated is used. The voltage of the lithium-ion secondary battery, which is 4.2V when fully charged, is stabilized to 3.3V by a DC/DC converter so that it does not apply to the one-chip microcontroller.

According to the present embodiment, the first power line 28 and the second power line 29 are separated at the stage of the power receiving circuit, so that they are less likely to be influenced by voltage fluctuations. Therefore, without using a backflow prevention circuit as an essential component, it is possible to provide a system that is less prone to reset of the arithmetic circuit 211, reading errors of the sensor 213, and has good maintainability.

<Embodiment 4>
FIG. 4 is a block diagram of a wireless power supply system according to a fourth embodiment of the present invention.

This embodiment differs from Embodiment 3 in that the first power receiving circuit 231 and the second power receiving circuit 232 of the mobile unit 8 share one power feeding circuit of the non-contact power feeding device 13 of the fixed unit 7. They are different in what they do. An example of such a case is an example where the number of coils 52 of the non-contact power supply device 13 is smaller than the number of coils 52 of the non-contact power receiving device 23. For example, one power receiving coil 52 of the first power line 28 and one power receiving coil 52 of the second power line 29 alternately receive power for one power feeding coil 52 .

Such a structure is realized by arranging the power receiving coil 52 facing the power feeding coil 52 along the movement direction of the mobile unit 8 when the mobile unit 8 moves sequentially, thereby simplifying the entire system. can. For example, in FIG. 4, when the moving unit 8 moves in the vertical direction indicated by the arrow, the first power receiving circuit 231 and the second power receiving circuit are charged by one power receiving coil.

According to the present embodiment, the first power line 28 and the second power line 29 are separated at the stage of the power receiving circuit, so that they are less likely to be influenced by voltage fluctuations. Therefore, similarly to the third embodiment, the power supply lines are less likely to be affected by voltage fluctuations, and reset of the arithmetic circuit 211 and reading errors of the sensor 213 are less likely to occur, making it possible to provide a system with good maintainability. .

Further, the wireless power supply system of the present invention can be used for equipment and mechanical devices including various mobile units that are supplied with power from a fixed unit.

As an application example of the non-contact power supply wireless operation system of the present invention, an automatic transport device is shown in FIG. FIG. 5A schematically shows a track 31 including a fixed unit 3 and a plurality of moving units 4 on the track. FIG. 5(b) shows the configuration of a cart embodying the moving unit 4. In the automatic transport device, a photoelectric sensor that detects the position of the cart, a rotary encoder, a satellite positioning system, or the like can be used as the sensor 213.

As another example embodying the present invention, an XY table is shown in FIG. The XY table includes two moving units: a Y-axis slider 10a and an X-axis slider 10b. In the XY table, any sensor such as a rotary encoder, a distance meter, or the like that detects a precise position can be used as the sensor 213.

In addition, the load of the present invention is not limited to the motor that moves the moving unit, but may include any power-consuming power source such as a spindle motor that processes a workpiece, processing performed on the moving unit, power necessary for operation, and a heat source. Mechanical devices can be applied. For example, various things can be applied, such as a heater, a speaker, a magnetron that generates electromagnetic waves, and an induction coil. Further, the motor may be of any specification, and may be a DC motor, an AC motor, a stepping motor, a servo motor, etc., and is not particularly limited.

1, 3, 5, 7 fixed unit 2, 4, 6, 8, 10a, 10b mobile unit 11 first control device 12 first radio device 13 contactless power supply device 21 second control device 22 second radio Device 23 Non-contact power receiving device 24 First power storage device 25 Second power storage device 26 Backflow prevention circuit 27 Load 28 First power supply line 29 Second power supply line 131 First power supply circuit 132 Second power supply circuit 211 Calculation Circuit 212 Output stage 213 Sensor 231 First power receiving circuit 232 Second power receiving circuit 52 Coil

Claims (10)

A wireless power supply system comprising a fixed unit and a mobile unit,
The fixed unit includes a first control device, a first wireless device connected to the first control device, and a contactless power supply device,
The mobile unit includes a second control device, a second wireless device, a contactless power reception device that receives power from the contactless power supply device, and a first power storage device, and A second control device communicates with the first wireless device via the second wireless device and has an arithmetic circuit and an output stage,
Furthermore, the mobile unit has a first power line connected to the contactless power receiving device to supply power to the second wireless device and the arithmetic circuit, and a first power line connected to the contactless power receiving device to supply power to the output stage. a second power line that supplies power to the
The first power storage device is connected to the first power supply line and stores only the power of the first power supply line ,
A wireless power supply system characterized in that the first power line and the second power line are separated from the stage of the wireless power receiving device . A wireless power supply system comprising a fixed unit and a mobile unit,
The fixed unit includes a first control device, a first wireless device connected to the first control device, and a contactless power supply device,
The mobile unit includes a second control device, a second wireless device, a contactless power reception device that receives power from the contactless power supply device, and a first power storage device, and A second control device communicates with the first wireless device via the second wireless device and has an arithmetic circuit and an output stage,
Furthermore, the mobile unit has a first power line connected to the contactless power receiving device to supply power to the second wireless device and the arithmetic circuit, and a first power line connected to the contactless power receiving device to supply power to the output stage. a second power line that supplies power to the
The first power storage device is connected to the first power supply line and stores only the power of the first power supply line,
A non-contact power supply wireless operating system, wherein a backflow prevention circuit is disposed between the non-contact power receiving device and the first power storage device of the first power supply line. 3. The wireless power supply system according to claim 2, wherein the first power supply line further includes a stabilizing circuit after the first power storage device. The contactless power supply device has a first power supply circuit and a second power supply circuit,
The contactless power receiving device is
a first power receiving circuit coupled to the first power supply circuit and connected to the first power supply line;
a second power receiving circuit coupled to the second power supply circuit and connected to the second power supply line;
The non-contact power supply wireless operation system according to claim 1, comprising: The contactless power receiving device is
a first power receiving circuit connected to the first power line;
a second power receiving circuit connected to the second power supply line,
The contactless power supply wireless operating system according to claim 1, wherein the power receiving circuits coupled to the contactless power supply device are alternately replaced. 6. The wireless power supply system according to claim 5, wherein the first power receiving circuit and the second power receiving circuit are arranged along the moving direction of the mobile unit. The contactless power supply device has a power transmission coil, the contactless power reception device has a power reception coil, and the contactless power supply device and the contactless power reception device are coupled by magnetic coupling. The wireless power supply system according to any one of items 1 to 6. 8. The wireless power supply system according to claim 1, wherein the second power supply line is provided with a second power storage device. The wireless power supply system according to claim 1, wherein the second control device includes a sensor, and the sensor is connected to the arithmetic circuit. The non-contact power feeding wireless operating system according to any one of claims 1 to 9, wherein the non-contact power supply wireless operation system is any one of an automatic conveyance device, a processing machine, an automatic warehouse, a robot, a measuring instrument, and a machine tool. Contact powered wireless actuation system.

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