JP2017147848A - Non-contact power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power supply device in which a mobile body to be a power supply object is made compact and lightweight, while improving a protection function by providing a voltage detection circuit in a simple configuration in the mobile body.SOLUTION: A non-contact power supply device comprises: multiple power supply coils 31 which are disposed on a stationary part (substrate production line 9); an AC power source 2 which supplies AC power to the multiple power supply coils 31; multiple power reception coils 41 which are disposed on a mobile body 99 and receive AC power in a non-contact manner; multiple rectification circuits 51 by which the AC power received by the multiple power reception coils 41 are converted into DC voltages Vdc respectively and output; a conversion circuit (DC power supply circuit 55) into which the DC voltages Vdc output from the multiple rectification circuits 51 are collected into one DC voltage and input and by which the DC voltage Vdc collected into one is converted into a driving voltage Vact and output to an electric load 6; and a voltage detection circuit 7 by which the DC voltage Vdc collected into one is detected and monitored.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a non-contact power feeding device that feeds power from a fixed part to a moving body in a non-contact manner.

  As a board production machine for producing a board on which a large number of parts are mounted, there are a solder printer, an electronic parts mounting machine, a reflow machine, a board inspection machine, and the like. It has become common to configure a substrate production line by connecting these facilities. Furthermore, there are many cases where a substrate production line is configured by arranging modular board production machines of the same size. By using a modularized board production machine, it is easy to change the setup when changing the line or adding a longer line, and a flexible board production line is realized.

  In recent years, it has been studied to promote labor saving and automation by transporting equipment and members used in each board production machine of a board production line to a moving body that moves along the board production line. Furthermore, a non-contact power feeding device is considered as a power feeding means to the moving body. The application of the non-contact power feeding device is not limited to the board production line, but covers a wide range of fields such as an assembly line and a processing line for producing other products, and power feeding during running of an electric vehicle. Patent Documents 1 and 2 disclose technical examples related to this type of non-contact power feeding device.

  The wireless power receiving apparatus disclosed in Patent Document 1 detects a power receiving coil, a rectifying unit that rectifies AC power received by the power receiving coil into DC power, a charging unit that charges the battery with DC power, and an output voltage value of the rectifying unit. A voltage detection unit; a power suppression unit including a switching element connected in parallel to the charging unit; and a control unit that controls the operation of the switching element. Then, the control unit controls the switching element to turn on when the output voltage value exceeds the first reference voltage value. According to this, when an abnormality such as an overvoltage occurs in the power receiving device, a large current due to the overvoltage is distributed and flows between the charging unit and the switching element, so that deterioration and breakage can be prevented.

  In the non-contact power feeding device for a linear motion mechanism disclosed in Patent Document 2, a plurality of primary transformer units (feeding elements) are intermittently arranged over the entire moving range of the moving body, and these primary transformer units are used as high frequency inverters. Each is connected in parallel via a switch, and a secondary transformer unit (power receiving element) is attached to the moving body. The embodiment discloses a configuration example in which two secondary transformer units are mounted on a moving body using a connecting component. According to this, one of the two secondary transformer units can always be supplied with power regardless of the position of the moving body.

Japanese Patent Laying-Open No. 2015-12655 JP-A-7-322535

  By the way, in the technical example of patent document 1, when the charge condition of a capacitor | condenser is raised and charging current value becomes small, input impedance will rise and there exists a possibility that the voltage concerning the both ends of a receiving coil may rise. In order to eliminate the fear of overvoltage due to such load fluctuations, there can be considered a method of stabilizing the non-contact power feeding by providing a plurality of power receiving coils (secondary transformer units) as exemplified in Patent Document 2. According to this, it is possible to directly drive the electric load by omitting the charging unit (charging circuit) and the battery (battery). Omission of the charging unit and the battery is preferable because it can contribute to the reduction in the size and weight of the moving body on which the power receiving device is mounted.

  However, even if this measure is adopted, the risk of overvoltage is not completely eliminated, and a voltage detection unit is provided for each of a plurality of sets of power reception coils and rectification units. For this reason, the moving body on which the power receiving device is mounted is increased in size and weight, and the driving force necessary for movement increases. In particular, in a configuration in which an electric drive source that generates a driving force is mounted on a moving body, it is necessary to increase the size of the receiving coil in order to increase the feed power, which leads to further increase in the weight and length of the moving body. End up.

  The present invention has been made in view of the above-described problems of the background art, and a moving body that is a power supply target includes a voltage detection circuit with a simple configuration to enhance a protection function and achieve a reduction in size and weight of the moving body. An object to be solved is to provide a contactless power feeding device.

  A non-contact power feeding device of the present invention that solves the above problems includes a plurality of power feeding elements arranged along a moving direction set in a fixed portion, an AC power source that supplies AC power to the plurality of power feeding elements, and A plurality of units arranged along the moving direction on a moving body that moves along the moving direction, and are electrically coupled to any one of the opposing feeding elements among the plurality of feeding elements to receive AC power in a non-contact manner. A power receiving element, a plurality of rectifier circuits that convert the AC power received by the plurality of power receiving elements into DC voltages, respectively, and a DC voltage that is output from each of the plurality of rectifier circuits is combined and input A conversion circuit that converts the DC voltage integrated into a drive voltage and outputs the drive voltage to an electric load; and a voltage detection circuit that detects and monitors the DC voltage integrated into the one. .

  The contactless power supply device of the present invention uses a common voltage detection circuit for a plurality of sets of power receiving elements and rectifier circuits to enhance the protection function, and thus is simpler than a configuration using individual voltage detection circuits for a plurality of sets. It becomes. Further, the moving body includes a plurality of power receiving elements, and at least one power receiving element is always in a good power receiving state regardless of the position of the moving body. For this reason, the charging circuit and the battery which are conventionally provided in the moving body can be eliminated, and the electric load can be directly driven. As a result, the moving body can be reduced in size and weight.

It is a figure which illustrates typically the composition of the non-contact electric supply device of a 1st embodiment. It is the circuit diagram which showed the detailed circuit structure by the side of the moving body of a non-contact electric power feeder. It is a figure which illustrates typically the composition of the conventional non-contact electric supply device. It is a figure which illustrates typically the composition of the non-contact electric supply of a 2nd embodiment.

(1. Configuration of the non-contact power feeding device 1 of the first embodiment)
A contactless power supply device 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram schematically illustrating the configuration of the contactless power supply device 1 of the first embodiment. The non-contact power feeding device 1 of the first embodiment is assembled to a board production line 9 corresponding to a fixed part. As shown in FIG. 1, the substrate production line 9 is configured by arranging three first to third substrate production machines 91, 92, 93. The left-right direction in FIG. 1 is an arrangement direction of the first to third substrate production machines 91, 92, 93, and is also a movement direction of the moving body 99 described later.

  Each board production machine 91, 92, 93 is modularized, and the width dimension ML in the row direction is equal to each other. The first to third substrate production machines 91, 92, 93 can be changed in the order of the arrangement positions and replaced with other modular board production machines. The number of board production machines that constitute the board production line 9 may be four or more, and it is possible to add modules to increase the number of board productions later. As the first to third board production machines 91, 92, 93, an electronic component mounting machine can be exemplified, and the invention is not limited to this.

  An unillustrated guide rail extending in the row direction is disposed in front of the first to third substrate production machines 91, 92, 93. The moving body 99 moves along the guide rail in the moving direction (the direction in which the first to third substrate production machines 91, 92, 93 are arranged). The moving body 99 has a role of loading equipment and members used in the substrate production machines 91, 92, and 93 from an unillustrated storage and returning the used equipment and members to the storage.

  The non-contact power feeding device 1 according to the first embodiment is a device that performs non-contact power feeding by the electromagnetic coupling method from the first to third board production machines 91, 92, and 93 with the moving body 99 as a power feeding target. The non-contact power feeding device 1 includes an AC power source 2, a power feeding coil 31, and a power feeding side capacitor 35 in first to third board production machines 91, 92, and 93, respectively. In addition, the non-contact power feeding apparatus 1 includes two moving coils 99, two power receiving coils 41, two power receiving capacitors 45, a power receiving circuit 5, an electric load 6, and a voltage detection circuit 7.

  Since the configuration related to the non-contact power feeding device 1 of the three substrate production machines 91, 92, 93 and other board production machines that are modularized is the same, hereinafter, the first board production machine 91 is denoted by a detailed reference numeral. To explain. The AC power supply 2 can be configured using, for example, a DC power supply unit that supplies a DC voltage and a known bridge circuit that converts the DC voltage to AC. The first output terminal 21 of the AC power supply 2 is directly connected to one end 311 of the power supply coil 31, and the second output terminal 22 is connected to one end 351 of the power supply side capacitor 35. The frequency of the AC voltage is preferably set based on the resonance frequencies of the power supply side resonance circuit and the power reception side resonance circuit described later. The frequency of the AC power supply can be exemplified by an order of several tens of kHz to several hundreds of kHz, and is not limited to this. The AC power supply 2 may have a function of adjusting a voltage value, a frequency, and the like.

  A total of three AC power supplies 2 provided in the three substrate production machines 91, 92, 93 can operate independently of each other. Each substrate production machine 91, 92, 93 has a sensor (not shown) that detects the approach of the moving body 99. And AC power supply 2 of each board | substrate production machine 91, 92, 93 operate | moves only when the mobile body 99 approaches. As a result, the AC power supply 2 is stopped while the moving body 99 is far away, and no unnecessary electric loss occurs.

  The feeding coil 31 is an embodiment of the feeding element. The power feeding coil 31 is provided on the front surface of each of the substrate production machines 91, 92, 93, and is formed in a symmetrical shape before and after the conveyance direction. The power supply side capacitor 35 is a resonance element that is connected in series to the power supply coil 31 to form a power supply side resonance circuit. The other end 352 of the power supply side capacitor 35 is connected to the other end 312 of the power supply coil 31. Thereby, a closed power feeding circuit is configured.

  The power receiving coil 41 is an embodiment of a power receiving element. The two power receiving coils 41 are disposed on a side surface 98 of the moving body 99 that faces the power feeding coil 31 and are spaced apart from each other along the moving direction. When the power feeding coil 31 and the power receiving coil 41 are arranged to face each other, they are electromagnetically coupled to generate mutual inductance, thereby enabling non-contact power feeding. The actual separation distance between the power supply coil 31 and the power reception coil 41 is smaller than the illustrated separation distance.

  Here, the length in the moving direction of the power feeding coil 31 and the power receiving coil 41 and the mutual separation distance adjacent to each other in the moving direction are set so that non-contact power feeding is performed stably. That is, regardless of the position of the moving body 99, the power feeding coil 31 and at least one power receiving coil 41 are always facing each other. The directly facing state means a state in which the entire length of the power receiving coil 41 in the moving direction faces within the range of the length of the feeding coil 31 in the moving direction.

  In the positional relationship illustrated in FIG. 1, the power supply coil 31 of the first board production machine 91 and the power reception coil 41 on the left side in the figure face each other, and the power supply coil 31 of the second board production machine 92 and the right side in the figure are on the right side. The power receiving coil 41 is directly facing. At this time, the two power receiving coils 41 are both in a good power receiving state, and can receive a large AC power as indicated by arrows P1 and P2. The power receiving coil 41 in the directly facing state has a power receiving capacity that can drive the electric load 6 alone.

  One end 411 of the power receiving coil 41 is connected to one end 451 of the power receiving side capacitor 45 and one terminal 511 on the input side of the rectifying circuit 51 constituting the power receiving circuit 5. The other end 412 of the power receiving coil 41 is connected to the other end 452 of the power receiving side capacitor 45 and the other terminal 512 on the input side of the rectifier circuit 51. The power receiving side capacitor 45 is a resonance element that is connected in parallel to the power receiving coil 41 to form a power receiving side resonance circuit.

  FIG. 2 is a circuit diagram illustrating a detailed circuit configuration on the moving body 99 side of the non-contact power feeding apparatus 1. As illustrated, the power receiving circuit 5 includes a rectifier circuit 51 provided for each power receiving coil 41 and a DC power supply circuit 55 provided in common to the two rectifier circuits 51. .

  The rectifier circuit 51 includes a full-wave rectifier circuit 52 in which four rectifier diodes are bridge-connected, and a smoothing capacitor 53 connected to the output side of the full-wave rectifier circuit 52. The two rectifier circuits 51 convert AC power received by the power receiving coils 41 connected to the respective input sides by non-contact power feeding into a DC voltage Vdc and output the DC voltage Vdc. One terminal 513 and the other terminal 514 on the output side of the two rectifier circuits 51 are connected in parallel to the DC power supply circuit 55. Therefore, the DC voltages Vdc output from the two rectifier circuits 51 are combined into one and input to the DC power supply circuit 55.

  The DC power supply circuit 55 is an embodiment of a conversion circuit that converts the combined DC voltage Vdc into the drive voltage Vact and outputs it to the electric load 6. The DC power supply circuit 55 has a function of stabilizing the drive voltage Vact. That is, the DC power supply circuit 55 adjusts the DC voltage Vdc with an indefinite voltage value output from the rectifier circuit 51 to a substantially constant DC drive voltage Vact, and supplies the electric load 6 mounted on the moving body 99 with power. An example of the DC power supply circuit 55 is a switching or dropper type DCDC converter. The DC power supply circuit 55 has a step-down function, and may further have a step-up function. The electric load 6 performs work on the moving body 99, and the type and power consumption are not limited. The electric load 6 may include a driving source for moving the moving body 99, such as a stepping motor or a servo motor.

  The voltage detection circuit 7 is connected in parallel to the input side of the DC power supply circuit 55. The voltage detection circuit 7 detects and monitors the combined DC voltage Vdc. For example, the voltage detection circuit 7 can be configured by combining an AD converter that detects the magnitude of the DC voltage Vdc and converts it into a digital voltage value, and an electronic control device that performs a predetermined monitoring process on the digital voltage value. Further, for example, the voltage detection circuit 7 combines a comparison circuit that compares the DC voltage Vdc with a predetermined reference voltage and a control circuit that executes a predetermined control process when the DC voltage Vdc becomes equal to or higher than the reference voltage. Can be configured.

  The monitoring function of the voltage detection circuit 7 is not particularly limited, and a DC voltage Vdc upper / lower limit monitoring function, an upper limit only monitoring function, a lower limit only monitoring function, or the like can be employed. For example, the voltage detection circuit 7 can have a function of stopping and protecting the DC power supply circuit 55 when the DC voltage Vdc exceeds a predetermined reference voltage. Further, for example, the voltage detection circuit 7 may transmit a stop command or an adjustment command to the AC power supply 2 on the substrate production machines 91, 92, and 93 via wireless communication. According to this, when the DC voltage Vdc deviates from the normal voltage range, the AC power supply 2 can be stopped, or the voltage value or frequency of the AC power supply 2 can be adjusted.

(2. Operation of the non-contact power feeding device 1 of the first embodiment)
Next, the operation of the non-contact power feeding device 1 of the first embodiment will be described in comparison with the prior art. FIG. 3 is a diagram schematically illustrating the configuration of a conventional non-contact power feeding device 1X. In the conventional non-contact power supply apparatus 1X, the configuration on the substrate production line 9 side corresponding to the fixed portion is the same as that in the first embodiment, and the configuration on the movable body 99 side is different from that in the first embodiment.

  In the conventional contactless power supply device 1 </ b> X, a DC power supply circuit 55 </ b> X is provided for each of the two sets of power receiving coils 41 and rectifier circuits 51. The two DC power supply circuits 55X combine the drive voltages Vact of the same magnitude on the output side into one and output them to the electric load 6. Further, the voltage detection circuit 7X is connected in parallel to the input sides of the two DC power supply circuits 55X.

  As is apparent from a comparison between FIG. 1 and FIG. 3, in the first embodiment, two DC power supply circuits 55X and two voltage detection circuits 7X used in the prior art can be reduced to one each.

(3. Aspects and effects of the non-contact power feeding device 1 of the first embodiment)
The non-contact power feeding device 1 according to the first embodiment includes a plurality (two) of power feeding coils 31 arranged along a moving direction set in a fixed portion (substrate production line 9), and a plurality of power feeding coils 31 with AC. The AC power supply 2 that supplies power and the moving body 99 that moves along the moving direction are arranged along the moving direction, and are electrically coupled to any one of the opposing feeding coils 31 among the plurality of feeding coils 31. A plurality (two) of receiving coils 41 that receive AC power in a non-contact manner, and a plurality (two) of rectifier circuits 51 that convert the AC power received by the plurality of receiving coils 41 into a DC voltage Vdc, respectively, and output the DC voltage Vdc. The DC voltage Vdc output from each of the plurality of rectifier circuits 51 is input as a single unit, and the combined DC voltage Vdc is converted into a drive voltage Vact and output to the electric load 6. With a (DC power supply circuit 55X), a voltage detecting circuit 7 which monitors and detects a DC voltage Vdc which is combined into one, the.

  The contactless power supply device 1 according to the first embodiment uses the voltage detection circuit 7 common to the plurality of sets of power receiving coils 41 and the rectifier circuit 51 to enhance the protection function. It becomes simpler than the configuration using. In addition, the moving body 99 includes a plurality of power receiving coils 41, and at least one power receiving coil 41 is always in a good power receiving state regardless of the position of the moving body 99. For this reason, the electric load 6 can be directly driven without using the charging circuit and the battery conventionally provided in the moving body 99. Accordingly, the moving body 99 can be reduced in size and weight.

  Furthermore, in the non-contact power feeding device 1 of the first embodiment, the power receiving element is the power receiving coil 31, and the power feeding element is the power feeding coil 41. The contactless power supply device 1 of the first embodiment includes a power supply side capacitor 35 that is connected to the power supply coil 31 to form a power supply side resonance circuit, and a power reception device that is connected to the power reception coil 31 to form a power reception side resonance circuit. A side capacitor 45 is further provided. According to these, in the non-contact power feeding device 1 of the electromagnetic coupling method, the power feeding efficiency can be remarkably increased by performing the non-contact power feeding utilizing the resonance phenomenon.

  Further, the fixed part is a substrate production line 9 in which a plurality (three) of substrate production machines 91 to 93 are arranged in a row, and the moving direction is set in the arrangement direction of the plurality of substrate production machines 91 to 93. The same number of the plurality of power supply coils 31 are arranged on each of the plurality of board production machines 91 to 93.

  According to this, the order of the arrangement positions of the first to third board production machines 91, 92, 93 is changed, the arrangement with other board production machines modularized, and the number of arrangements to four or more. In all cases corresponding to the addition of modules to be added, the non-contact power feeding device 1 is ensured in a good power receiving state. Accordingly, when the line configuration of the board production line 9 is changed or when modules are added, the setup change work for the non-contact power feeding device 1 is simple.

(4. Non-contact electric power feeder 1A of 2nd Embodiment)
Next, the non-contact power feeding device 1A of the second embodiment will be described mainly with respect to differences from the first embodiment. In the second embodiment, the configuration on the substrate production line 9 side corresponding to the fixed portion is different from that in the first embodiment, and the configuration on the movable body 99 side is the same as that in the first embodiment. FIG. 4 is a diagram schematically illustrating the configuration of the contactless power feeding device 1A of the second embodiment.

  As illustrated, the AC power supply 25 is provided in common to the plurality of power supply coils 31. The power supply capacity of the AC power supply 25 is larger than the power supply capacity of the AC power supply 2 of the first embodiment. Open / close switches 26 are respectively inserted in electric paths connecting the AC power supply 25 and the power supply coils 31 of the first to third substrate production machines 91, 92, 93 in parallel. While the non-contact power feeding apparatus 1A is operating, the AC power supply 25 continues to operate. The open / close switch 26 of each substrate production machine 91, 92, 93 is closed only when the approach of the moving body 99 is detected by a sensor (not shown). As a result, while the moving body 99 is far away, the feeding coil 31 is not excited and no unnecessary electric loss occurs.

  The operation of the non-contact power feeding device 1A of the second embodiment is the same as that of the first embodiment. Therefore, also in the second embodiment, the protection function can be enhanced by using the common voltage detection circuit 7, and the charging circuit and the battery can be eliminated. As a result, the moving body 99 can be reduced in size and weight.

(5. Application and modification of embodiment)
Note that the frequency of the AC power supplies 2 and 25 may be shifted from the resonance frequency while using the power supply side capacitor 35 and the power reception side capacitor 45 as resonance elements. In this case, since it becomes difficult to be affected by the change in the resonance characteristics, even if the absolute value of the DC voltage Vdc is somewhat reduced, the voltage fluctuation is reduced. Further, the non-contact power feeding method is not limited to the electromagnetic coupling method using the power feeding coil 31 and the power receiving coil 41, and may be, for example, an electrostatic coupling method using a power feeding electrode and a power receiving electrode. Various other applications and modifications are possible for the present invention.

  In addition to the board production line 9 described in the embodiment, the non-contact power feeding device of the present invention can be used in a wide range of fields such as an assembly line and a processing line for producing other products, and power feeding during running of an electric vehicle.

1, 1A: Non-contact power supply device 2: AC power supply 25: AC power supply 26: Open / close switch 31: Power supply coil (power supply element)
35: Power supply side capacitor (resonance element)
41: Power receiving coil (power receiving element)
45: Power receiving side capacitor (resonance element)
51: Rectifier circuit 55: DC power supply circuit (conversion circuit)
6: Electric load 7: Voltage detection circuit 9: Board production line (fixed part)
91-93: 1st-3rd board production machine 99: Mobile

Claims (4)

A plurality of feeding elements arranged along the moving direction set in the fixed part;
AC power supply for supplying AC power to the plurality of power feeding elements,
A plurality of units that are arranged along the moving direction on a moving body that moves along the moving direction, and that are electrically coupled to one of the opposing feeding elements among the plurality of feeding elements and receive AC power in a non-contact manner. Power receiving elements,
A plurality of rectifier circuits that convert the AC power received by the plurality of power receiving elements into DC voltages, respectively, and output them,
DC voltage output from each of the plurality of rectifier circuits is integrated and input, a conversion circuit that converts the combined DC voltage into a drive voltage and outputs it to an electrical load;
A voltage detection circuit for detecting and monitoring the DC voltage combined into the one;
The non-contact electric power feeder provided with.   The contactless power feeding device according to claim 1, further comprising a resonance element that is connected to at least one of the power feeding element and the power receiving element to form a resonance circuit.   The non-contact power feeding apparatus according to claim 1, wherein the power receiving element is a power receiving coil, and the power feeding element is a power feeding coil. The fixing unit is a substrate production line in which a plurality of substrate production machines are arranged, and the moving direction is set in the arrangement direction of the plurality of substrate production machines,
The contactless power feeding device according to any one of claims 1 to 3, wherein the same number of the plurality of power feeding elements are arranged in each of the plurality of board production machines.

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