JP2012161193A - Non-contact power supply device - Google Patents

Abstract

[PROBLEMS] To suppress a phenomenon in which high-frequency noise output from an inverter is applied to a commercial power supply in a non-contact power feeding device.
A non-contact power feeding apparatus 100 that feeds power to a moving body 220 in a non-contact manner via a feeding line 210 laid along a track of the moving body 220, the inverter 110 and a first output terminal of the inverter 110 A first inductor 101 having one end connected to U, a second inductor 102 having one end connected to the second output terminal V of the inverter 110, and the other end of the first inductor 101 and the other end of the second inductor 102. A first capacitor 121 having both ends connected thereto, and a third inductor 103 connecting the other end of the first inductor 101 and one end of the feeder line 210 are provided.
[Selection] Figure 3

Description

  The present invention relates to a non-contact power supply apparatus that supplies power to a moving body such as a transport vehicle that transports a load in a non-contact manner.

  2. Description of the Related Art Conventionally, in a clean room or the like, a non-contact power feeding device has been used as a power supply system for a moving body such as a transport vehicle in order to prevent generation of dust due to friction.

  Such a non-contact power feeding device converts a commercial power source to a high frequency suitable for non-contact power feeding by an inverter, and causes a current of a predetermined frequency to flow through a feeding line laid along the track of the carrier vehicle. It is carried out. In other words, the power supply line drawn long along the track of the transport vehicle functions as the primary coil of the transformer, and the pickup coil provided in the transport vehicle functions as the secondary coil, so that the power supply line is not connected to the transport vehicle. Power is supplied by contact.

  Normally, since a plurality of transport vehicles are arranged for one power supply line, the output of the inverter of the non-contact power supply device changes every moment corresponding to the traveling state of the transport vehicle. Therefore, in order to improve power supply efficiency in consideration of the safety of the facility, it is composed of a capacitor and an inductor that resonate as a whole including the inductance of the power supply line, as in the non-contact power supply device described in Patent Document 1. The circuit to be connected is connected between the inverter and the feeder line.

JP 2002-218681 A

  However, the present inventor has found that when using a conventional non-contact power supply device, noise having a frequency higher than the frequency of the current supplied to the power supply line is applied to the commercial power supply side. By outputting such high-frequency noise to the commercial power supply side, other devices connected to the same commercial power supply may be adversely affected. As a result of the inventors' diligent research and experiments, the noise applied to the commercial power supply side is a high-frequency component included when the inverter included in the non-contact power feeding device outputs a square wave, and the track of the carrier vehicle It has been found that the feed line routed along the line functions like an antenna to radiate high-frequency noise, and that the noise is applied to the commercial power supply side.

  The present invention has been made on the basis of the above knowledge, and suppresses high-frequency noise radiated from the power supply line while maintaining the power supply efficiency of the non-contact power supply device in a high state, and the noise applied to the commercial power supply side. An object of the present invention is to provide a non-contact power feeding device capable of reducing the amount.

  In order to achieve the above object, a non-contact power feeding device according to the present invention is a non-contact power feeding device that feeds power to the moving body in a non-contact manner via a feeding line laid along the track of the moving body, An inverter that converts the frequency of the power source into a high frequency and outputs; a first inductor having one end connected to the first output terminal of the inverter; a second inductor having one end connected to the second output terminal of the inverter; A first capacitor having both ends connected to the other end of the first inductor and the other end of the second inductor, and a third inductor connecting the other end of the first inductor and one end of the feeder line. It is characterized by providing.

  This reduces the high frequency noise component applied to the power supply line by the first inductor and the second inductor connected to each of the output terminals of the inverter, and increases the power supply efficiency by the first capacitor and the third inductor. It becomes possible to do.

  Furthermore, a fourth inductor that connects the other end of the second inductor and the other end of the feeder line may be provided.

  According to this, the circuit configuration of the inductor and the capacitor connected between the inverter and the power supply terminal can be made geometrically symmetrical, and the radiated high frequency noise can be effectively reduced. .

  Furthermore, it is good also as what has a box-shaped electromagnetic shield which accommodates said 1st inductor and said 2nd inductor, and hold | maintains so that the positional relationship of said 1st inductor and said 2nd inductor may become symmetrical.

  According to this, the high frequency noise leaking from the first inductor and the second inductor is effectively blocked by the electromagnetic shield, and it is possible to effectively avoid the high frequency noise being applied to the commercial power source.

  According to the present invention, it is possible to reduce the amount of noise applied to the commercial power supply side by reducing high-frequency noise radiation from the feeder line while maintaining a high feeding efficiency.

FIG. 1 is a diagram schematically illustrating a relationship between a contactless power supply device, a moving object that is a power supply target, and a power supply line. FIG. 2 is a perspective view schematically showing the relationship between the pickup coil and the power supply line provided in the moving body. FIG. 3 is a circuit diagram illustrating a component configuration of the non-contact power feeding device. FIG. 4 is a circuit diagram illustrating a component configuration of the non-contact power feeding device. FIG. 5 is a circuit diagram showing another mode of the first inductor and the second inductor.

  Next, an embodiment of a non-contact power feeding device according to the present invention will be described with reference to the drawings. In addition, the following embodiment is only what showed an example of the non-contact electric power feeder which concerns on this invention. Accordingly, the scope of the present invention is defined by the wording of the claims with reference to the following embodiments, and is not limited to the following embodiments.

(Embodiment 1)
FIG. 1 is a diagram schematically illustrating a relationship between a contactless power supply device, a moving object that is a power supply target, and a power supply line.

  FIG. 2 is a perspective view schematically showing the relationship between the pickup coil and the power supply line provided in the moving body.

  As shown in FIG. 1, the tracked vehicle system 200 transfers unprocessed and processed packages to / from a manufacturing apparatus in a clean room or the like, and also stores them in a storage area or other manufacturing apparatus. This is a system for transporting, and includes a non-contact power supply device 100, a power supply line 210, and a moving body 220.

  The moving body 220 is a traveling vehicle that travels along a track (not shown) laid in the factory, and is a device that receives and drives electric power from the non-contact power supply device 100 via the power supply line 210 in a non-contact manner. is there. The moving body 220 includes a pickup coil 201 that is a power receiving device for receiving power from the power supply line 210 in a contactless manner.

  Although shown in an omitted state in FIG. 1, the length of the power supply line 210 may be several hundred meters or more in a round trip. Moreover, it may be routed in a complicated manner along a complicated trajectory.

  The pickup coil 201 is a device that receives electric power using an induced electromotive force generated by an alternating current flowing in the power supply line 210, and has a substantially E-shaped cross section across the forward path 211 and the return path 212 of the power supply line 210. A ferrite core 213 and a coil 214 wound around the core 213 are provided. The pickup coil 201 is a device that receives an alternating magnetic field generated by flowing a high-frequency current through the power supply line 210, and extracts electric power from a voltage generated in the coil 214 due to a change in the magnetic flux. As described above, the moving body 220 including the pickup coil 201 can receive power from the power supply line 210 in a non-contact manner.

  The power supply line 210 is an electric wire that functions as a primary coil of the transformer with respect to the pickup coil 201. In the case of the present embodiment, a litz wire that can suppress leakage of high-frequency noise to some extent is used. The power supply line 210 is routed along the track of the moving body 220 as a pair of the forward path 211 and the return path 212, and is also laid near the metal part of the factory building and the electrical equipment. It is considered that high frequency noise is likely to leak from the part.

  FIG. 3 is a circuit diagram illustrating a component configuration of the non-contact power feeding device.

  As shown in the figure, the non-contact power feeding device 100 is a device that feeds power to the moving body 220 in a non-contact manner via a power feeding line 210 laid along the track of the moving body 220. One inductor 101, a second inductor 102, a first capacitor 121, and a third inductor 103 are provided.

  The inverter 110 is a device that can convert AC power obtained from the commercial power source 215 into a predetermined frequency. In the case of the present embodiment, the inverter 110 is configured by a switching element and is a device that can output a square wave having a predetermined frequency between the first output terminal U and the second output terminal V. The frequency of the square wave output from the inverter 110 is about 10 kHz, and the output voltage is about several hundreds V at maximum.

  The first inductor 101 is a coil having one end connected to the first output terminal U of the inverter 110. In the case of the present embodiment, the first inductor 101 has characteristics of allowing a high frequency (for example, 10 kHz) output to the feeder line 210 to pass through with low loss and reducing a noise component having a frequency higher than the frequency. Is.

  Here, “connection” described in the present specification and claims means electrical connection. Further, “connection” includes not only direct connection by a conducting wire but also “connection” when other components are interposed in the middle. In addition, “connection” includes a case where electrical continuity can be secured as alternating current. Therefore, even when capacitors that are in a direct current and steady state are connected in series, they are included in the “connection”.

  The high-frequency noise reduction function can be realized not only by the first inductor 101 but by the balance of the entire circuit including each component described later.

  The second inductor 102 is a coil having one end connected to the second output terminal V of the inverter 110. In the present embodiment, the second inductor 102 uses a coil having the same characteristics as the first inductor 101.

  The third inductor 103 is a coil that connects the other end of the first inductor and one end of the feeder line. In the case of the present embodiment, the third inductor 103 is for matching with the inductance of the feeder line 210 to improve the feeding efficiency, and the selector 131 can adjust the inductance.

  By making the inductance of the third inductor 103 variable, the inductance of the third inductor 103 can be adjusted so as to match the inductance of the feeder line 210 determined by the configuration of the tracked mobile system 200. Therefore, the LC circuit included in the contactless power supply device 100 can be brought into an optimal state.

  The first capacitor 121 is a capacitor having both ends connected to the other end of the first inductor 101 and the other end of the second inductor 102. In the present embodiment, one end of the first capacitor 121 is connected between the first inductor 101 and the third inductor 103, and the other end is connected between the second inductor 102 and the feeder line 210. . The first capacitor 121 forms an LC circuit by a combination of the first inductor 101 and the second inductor 102, and from the first output terminal U and the second output terminal V of the inverter 110 by the LC circuit. Any high-frequency noise component that is output can be reduced or eliminated.

  According to the non-contact power supply apparatus 100 described above, high frequency noise components output from the inverter 110 are removed as much as possible while ensuring high power supply efficiency by matching with the power supply line 210 that is routed for a long time. be able to. Therefore, it is possible to suppress the noise component from being radiated from the power supply line 210 that is routed for a long time, and to suppress the noise component from being applied to the commercial power supply.

(Embodiment 2)
Next, another embodiment according to the present invention will be described.

  FIG. 4 is a circuit diagram illustrating a component configuration of the non-contact power feeding device.

  As shown in the figure, the non-contact power feeding device 100 is a device that feeds power to the moving body 220 in a non-contact manner via a feeding line 210 laid along the track of the moving body 220, as in the first embodiment. The inverter 110, the first inductor 101, the second inductor 102, the first capacitor 121, and the third inductor 103 are provided. In the case of the present embodiment, the contactless power supply device 100 further includes a fourth inductor 104, a second capacitor 122, a third capacitor 123, and an electromagnetic shield 130.

  In addition, the structure provided with the same function as Embodiment 1 attaches | subjects the same code | symbol, and abbreviate | omits description.

  The fourth inductor 104 is a coil that connects the other end of the second inductor and the other end of the feeder line. In the case of the present embodiment, the fourth inductor 104 matches the inductance of the power supply line 210 together with the third inductor 103 to improve the power supply efficiency, and the inductance can be adjusted by the selector 132.

  By providing the fourth inductor 104 in this manner, the fourth inductor 104 can be disposed geometrically symmetrical to the third inductor 103, and radiation of high-frequency noise from the non-contact power feeding device 100 can be further suppressed.

  The second capacitor 122 is a capacitor whose both ends are connected to the other end of the third inductor 103 and one end of the feeder line 210. The second capacitor 122 is for matching with the feeder line 210, and the capacitance can be adjusted. In the case of the present embodiment, specifically, the non-contact power feeding device 100 includes a first bus bar row 141 having two bus bars arranged in parallel, and the bus bar connected to the power feed line 210 and the inverter 110 side. It is possible to adjust the capacitance of the second capacitor 122 as a whole by connecting a plurality of capacitors in a bridging manner to the bus bar connected to the capacitor or by removing some of the connected capacitors. Yes.

  Similar to the second capacitor 122, the third capacitor 123 is a capacitor whose both ends are connected to the other end of the fourth inductor 104 and the other end of the feeder line 210. The second capacitor 122 is for matching with the feeder line 210, and the capacitance can be adjusted. Specifically, the non-contact power feeding apparatus 100 includes a second bus bar row 142 having two bus bars arranged in parallel, and a bus bar connected to the power supply line 210 and a bus bar connected to the inverter 110 side. The capacitance of the third capacitor 123 can be adjusted as a whole by connecting a plurality of capacitors in a bridging manner or by removing some of the connected capacitors.

  The electromagnetic shield 130 is a box-shaped member for shielding high-frequency noise radiated from the non-contact power supply apparatus 100. In the present embodiment, the electromagnetic shield 130 includes the first inductor 101, the second inductor 102, the third inductor 103, the fourth inductor 104, the second capacitor 122, the third capacitor 123, The bus bar row 141 and the second bus bar row 142 are accommodated inward. Also, the first inductor 101 and the second inductor 102, the third inductor 103 and the fourth inductor 104, the first capacitor 121, the second capacitor 122 and the third capacitor 123, the first bus bar row 141 and the second bus bar row 142, or more The combination of the components is arranged so as to be geometrically symmetrical (line symmetric) in the electromagnetic shield 130. Further, the combination of the components is arranged so as to be symmetrical even in the geometric positional relationship with the wall surface of the electromagnetic shield 130. That is, the first inductor 101, the second inductor 102, the third inductor 103, the fourth inductor 104, the second capacitor 122, the third capacitor 123, the first bus bar row 141, and the second bus bar row 142. And the geometric symmetry axis of the electromagnetic shield 130 coincide with each other. The first capacitor 121 is disposed on the axis of symmetry.

  As described above, the geometric structure inside the non-contact power feeding device 100 is made symmetric, and balanced output is connected to the output of the inverter 110, whereby the signals are individually sent from the first output terminal U and the second output terminal V of the inverter 110. It is possible to reduce the outflow of high-frequency noise to the commercial power supply. Furthermore, noise that leaks out from the circuit can be reduced as much as possible by eliminating the imbalance in the arrangement of the components and the imbalance in the positional relationship between the electromagnetic shield 130 and the components.

  In addition, this invention is not limited to the said embodiment. For example, another embodiment realized by arbitrarily combining the components described in this specification and excluding some of the components may be used as an embodiment of the present invention. In addition, the present invention includes modifications obtained by making various modifications conceivable by those skilled in the art without departing from the gist of the present invention, that is, the meaning described in the claims. It is.

  For example, although the second capacitor 122 and the third capacitor 123 are shown in FIG. 4, the non-contact power feeding apparatus 100 that does not include any one of these capacitors is also included in the present invention. Further, the inverter 110 may be accommodated inside the electromagnetic shield 130. Further, as shown in FIG. 5, the first inductor 101 and the second inductor 102 may be constituted by two coils, and the coil closer to the inverter 110 may function as a common mode choke coil.

  Further, the electromagnetic shield 130 may have a function of structurally protecting a component included as a so-called switchboard.

  Further, terms such as “parallel” and “symmetric” are used to allow an error (expansion) that does not depart from the spirit of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for a tracked vehicle system for transferring a load, and is particularly effective for a tracked vehicle system in which a power supply line is long and routed in a complicated manner.

U first output terminal V second output terminal 100 contactless power supply device 101 first inductor 102 second inductor 103 third inductor 104 fourth inductor 110 inverter 121 first capacitor 122 second capacitor 123 third capacitor 130 electromagnetic shield 131 selector 132 Selector 141 First bus bar row 142 Second bus bar row 200 Tracked vehicle system 201 Pickup coil 210 Feed line 211 Outward route 212 Return route 213 Core 214 Coil 215 Commercial power source 220 Moving body

Claims (4)

A non-contact power feeding device that feeds power to the moving body in a non-contact manner via a feeding line laid along the trajectory of the moving body,
An inverter that converts the frequency of the power source into a high frequency and outputs it;
A first inductor having one end connected to the first output terminal of the inverter;
A second inductor having one end connected to the second output terminal of the inverter;
A first capacitor having both ends connected to the other end of the first inductor and the other end of the second inductor;
A non-contact power feeding device comprising: a third inductor that connects the other end of the first inductor and one end of the feed line. further,
The non-contact electric power feeder of Claim 1 provided with the 4th inductor which connects the other end of said 2nd inductor, and the other end of the said feeder. further,
The non-contact electric power feeder of Claim 1 provided with the 2nd capacitor by which both ends are each connected to the other end of the said 3rd inductor and the one end of the said feeder. further,
The non-contact according to claim 1, further comprising a box-shaped electromagnetic shield that accommodates the first inductor and the second inductor, and holds the first inductor and the second inductor so that a positional relationship between them is symmetrical. Power supply device.

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