JP2013017347A - Power supply device for non-contact power supply, and power supply harmonic reduction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device for non-contact power supply and power supply harmonic reduction method which reduce power supply harmonic and line regulation.SOLUTION: A first to third AC reactors are serially inserted into a first to third power supply lines connecting a three-phase AC power supply and a rectification circuit, respectively. Interconnect lines connect the first to third power supply lines with each other between the three-phase AC power supply and the first to third AC reactors. A first to third resonance reactors are serially inserted into the interconnect lines and allocated so as to make transformer coupling with the first to third AC reactors respectively. A first to third connection capacitors are inserted into the interconnect lines and allocated among the first to third resonance reactors, where the first to third resonance reactors and the first to third connection capacitors configure a resonance circuit, and each parameter of the first to third resonance reactors and the first to third connection capacitors is set so as to resonate at a frequency which is lower than a resonance frequency of the resonance circuit and 2 to 3 times as large as a power supply frequency of the three-phase AC power supply.

Description

  The present invention relates to a power supply device for contactless power feeding and a method for reducing power supply harmonics.

  In a clean room such as a semiconductor manufacturing factory, a non-contact power feeding system is used to drive a traveling vehicle that transports articles.

The non-contact power supply system includes a primary side circuit including a power supply device and a power supply line that function as a power source, and a secondary side circuit including a motor of a traveling vehicle.
The power supply apparatus includes, for example, a variable voltage power supply and an impedance conversion unit. In such a power supply device, a predetermined voltage from the variable voltage power source is converted into a predetermined current by an impedance conversion unit including an inductor and a capacitor, and power is supplied to the power supply line. The power supply line is installed along the track of the traveling vehicle, and supplies power to the secondary circuit by electromagnetic induction (see, for example, Patent Document 1).

  In addition, a power feeding apparatus that employs a three-phase rectifier circuit, rectifies an alternating current from a three-phase AC power source by the three-phase rectifier circuit, and supplies power to a motor or the like of a traveling vehicle has been proposed. In a power feeding device that employs such a three-phase rectifier circuit, a problem arises in that many harmonic components are generated in the power supply current, which adversely affects the power supply system. Therefore, a reactor for suppressing harmonics is inserted between the three-phase AC power source and the three-phase rectifier circuit.

JP 2002-354710 A

  In the power feeding device, in order to provide a stable output voltage, it is required that the power supply fluctuation rate in the DC voltage after rectification is low. However, if the reactor placed between the phase AC power supply and the three-phase rectifier circuit is increased for the purpose of improving power supply harmonics, the load will increase and the voltage will drop, increasing the power supply fluctuation rate. There was a problem to do.

  An object of the present invention is to reduce power supply harmonics and power supply fluctuation rates in a non-contact power supply apparatus.

  Hereinafter, a plurality of modes will be described as means for solving the problems. These aspects can be arbitrarily combined as necessary.

  A power supply device for contactless power supply according to an aspect of the present invention includes a rectifier circuit, first to third power supply lines, first to third AC reactors, a connection line, first to third resonance reactors, and a first power supply device. To 3 connection capacitors. The rectifier circuit converts the three-phase AC power source into DC. The first to third power supply lines connect the three-phase AC power supply and the rectifier circuit. The first to third AC reactors are inserted in series in the first to third power supply lines, respectively. The connection line connects the first to third power lines between the three-phase AC power source and the first to third AC reactors. The first to third resonance reactors are inserted in series with the connection line and arranged to be transformer-coupled to the first to third AC reactors, respectively. The first to third connection capacitors are inserted into the connection line and disposed between the first to third resonance reactors. Here, the first to third resonance reactors and the first to third connection capacitors constitute a resonance circuit, which is a frequency lower than the resonance frequency of the resonance circuit and 2 to 3 times the power frequency of the three-phase AC power source. Each parameter is set to resonate at a frequency.

  Here, the first to third resonance reactors and the first to third connection capacitors inserted in the connection line constitute a resonance circuit, which is a frequency lower than the resonance frequency of the resonance circuit and 2 to 3 times the power supply frequency. Each parameter is set so as to resonate at a frequency of. Further, the first to third AC reactors and the first to third resonance reactors are respectively transformer-coupled. By having such a configuration, even if a load current is generated by the operation of the rectifier circuit, the load current is canceled by the current flowing through the connection line due to resonance. It is always a sine wave without being affected by. That is, the harmonic current can be suppressed. Further, the first to third AC reactors and the first to third resonance reactors that have a canceling relationship as inductances do not make the reactor a series impedance of the power supply system, and as a result, a stable power supply voltage can be supplied. Accordingly, it is possible to reduce the power supply harmonics and the power supply fluctuation rate.

  The method for reducing power supply harmonics according to another aspect of the present invention includes a rectifier circuit, first to third power supply lines, first to third AC reactors, a connection line, first to third resonance reactors, and a first. In the power supply device for contactless power supply including the three to three connection capacitors, a step of inducing a voltage in the first to third resonance reactors due to a load current generated from the rectifier circuit, the first to third resonance reactors, and the first The resonance circuit constituted by the 1 to 3 connection capacitors is resonated at a frequency lower than the resonance frequency of the resonance circuit and 2 to 3 times the power supply frequency of the three-phase AC power supply, thereby forming the first to third resonance reactors. Canceling the load current with the flowing bypass current. Here, the rectifier circuit converts the three-phase AC power source into DC. The first to third power supply lines connect the three-phase AC power supply and the rectifier circuit. The first to third AC reactors are inserted in series in the first to third power supply lines, respectively. The connection line connects the first to third power lines between the three-phase AC power source and the first to third AC reactors. The first to third resonance reactors are inserted in series with the connection line and arranged to be transformer-coupled to the first to third AC reactors, respectively. The first to third connection capacitors are inserted into the connection line and disposed between the first to third resonance reactors.

  In the power supply device for contactless power feeding according to the present invention, power harmonics and power fluctuation rates can be reduced.

Schematic schematic diagram of a ceiling transport vehicle system in a clean room. The longitudinal cross-sectional schematic diagram in a rail. The electric power feeding circuit diagram which shows the electric power feeding mechanism of an electric power supply apparatus. FIG. 3 is a diagram illustrating an example of parameters of each element in the first embodiment. The figure which shows the waveform of the power supply current i11 at the time of the low load electric power in Example 1, the load current i12, and the bypass current i13. The figure which shows the waveform of the power supply current i11 at the time of the high load electric power in Example 1, the load current i12, and the bypass current i13. The figure which shows the total harmonic distortion factor at the time of the low load electric power in Example 1, and the time of high load electric power, and DC power supply fluctuation rate. The figure which shows the other parameter example of each element in another Example.

(1) Whole overhead conveyance vehicle system The overhead conveyance vehicle system 1 is demonstrated using FIG. FIG. 1 is a schematic diagram of a ceiling guided vehicle system in a clean room. The overhead conveyance vehicle system 1 is provided in a clean room or the like such as a semiconductor factory, and conveys FOUP (Front Opening Unified Pod). The ceiling transport vehicle system 1 mainly includes a rail 3 and a ceiling transport vehicle 5 that travels along the rail 3.

  The semiconductor factory has a plurality of bays (processes), and an interbay route 101 is provided to connect remote bays. Further, each bay has an intra bay route 103. The inter bay route 101 and the intra bay route 103 are configured by the rail 3.

  A plurality of processing apparatuses 105 such as semiconductor processing apparatuses are arranged along the intra-bay route 103. Further, a load port 107 is provided in the vicinity of the plurality of processing apparatuses 105. The load port 107 is provided directly below the intra-bay route 103. In the above configuration, the ceiling transport vehicle 5 travels on the rail 3 and transports the FOUP between the load ports 107.

(2) Rail The rail 3 will be described with further reference to FIG. FIG. 2 is a schematic vertical sectional view in the rail. The rail 3 is suspended from the ceiling 9 by a plurality of columns 7. The rail 3 mainly includes a travel rail 11 and a power supply rail 13 provided at the lower portion of the travel rail 11.

  The traveling rail 11 is made of, for example, aluminum, and is configured in a reverse U shape in cross section as shown in FIG. The traveling rail 11 has an upper surface portion 11a and both side surface portions 11b. A pair of first running surfaces 11c extending inward are formed below the side surface portions 11b. Further, a second traveling surface 11d is formed on the upper side of the inner side surface of both side surface portions 11b, and a third traveling surface 11e is formed on the lower side surface of the upper surface portion 11a.

  The power supply rail 13 has a pair of power supply line holders 15 provided on both lower sides of the traveling rail 11. In the feeder line holder 15, a pair of feeder lines 17 made of litz wires are disposed by covering a conductive wire such as a copper wire with an insulating material. A power supply device 41 is provided at one end of the power supply line 17, and power is supplied to the pair of power supply lines 17.

(3) Ceiling Transport Vehicle The ceiling transport vehicle 5 mainly includes a traveling unit 21, a power receiving unit 23, and a transport vehicle main body unit 25. The traveling unit 21 is a mechanism that is disposed in the traveling rail 11 and travels on the rail 3. The power receiving unit 23 is a mechanism that is disposed in the power supply rail 13 and is supplied with power from the pair of power supply lines 17. The transport vehicle main body 25 is a mechanism that is disposed below the power supply rail 13, holds the FOUP, and moves up and down.
The traveling unit 21 is mainly disposed in the traveling rail 11, and includes a pair of first guide wheels 18, a pair of second guide wheels 19, a traveling drive wheel 20, and a traveling motor (not shown). have. A pair of 1st guide wheel 18 is arrange | positioned at the lower part both sides of the traveling part 21, and is rotatably supported by the axle shaft extended in the left-right direction. The first guide wheel 18 is placed on the first travel surface 11 c of the travel rail 11.

  The second guide wheels 19 are disposed on both sides of the upper portion of the traveling unit 21 and are rotatably supported on an axle extending in the vertical direction. The second guide wheel 19 uses the second travel surface 11d of the travel rail 11 as a guide surface to prevent a positional shift in the left-right direction with respect to the traveling direction of the ceiling transport vehicle 5.

  The traveling drive wheel 20 is disposed substantially at the center of the traveling unit 21 and is pressed against the third traveling surface 11e of the traveling rail 11 by a pressing means such as a spring. The travel drive wheel 20 is driven by a travel motor (not shown). As a result, the ceiling transport vehicle 5 travels on the travel rail 11.

(4) Power Receiving Unit The power receiving unit 23 has a pair of pickup units 27 for obtaining power from the pair of power supply lines 17. Specifically, the pair of pickup units 27 are arranged side by side in the power supply rail 13. Each pickup unit 27 has a ferrite core 29 having a substantially E-shaped cross section, and a pickup coil 31 wound around the core 29. Specifically, the core 29 has projecting portions 29a on both sides and a central projecting portion 29b therebetween, and the pickup coil 31 is wound around the projecting portion 29b in the center.

  A pair of power supply lines 17 held by the power supply line holder 15 are respectively disposed between the protruding portions 29a on both sides and the protruding portion 29b on the center. A magnetic field generated by passing a current through the pair of feed lines 17 acts on the pickup coil 31, and an induced current is generated in the pickup coil 31. In this way, electric power is supplied from the pair of power supply lines 17 to the pickup unit 27 in a non-contact manner to drive the traveling motor or supply electric power to the control device.

(5) Power Supply Device (5-1) Configuration of Power Supply Device Next, with reference to FIG. 3, power that supplies power to the overhead transport vehicle 5 by a non-contact power supply method using a pair of feeder lines 17. The supply device 41 will be described. FIG. 3 is a power supply circuit diagram showing a power supply mechanism of the power supply apparatus.

  The power supply device 41 includes a three-phase AC power supply 43, a rectifier circuit 45, a smoothing capacitor 47, and a load 49. The power supply device 41 further includes first to third power supply lines 51, 53, 55, first to third AC reactors 57, 59, 61, a connection line 63, first to third resonance reactors 69, 71, 73, and a first. -3 connection capacitors 75, 77, 79 are included.

The three-phase AC power supply 43 supplies three-phase (U-phase, V-phase, W-phase) AC voltages whose phases are shifted from each other by 120 degrees via the first to third power supply lines 51, 53, 55.
The rectifier circuit 45 rectifies alternating current from the three-phase alternating current power supply 43 into direct current. The rectifier circuit 45 is a diode bridge configured by bridge-connecting a plurality of diodes D1, D2, D3, D4, D5, and D6.
The smoothing capacitor 47 (C4) is connected between the DC output terminals of the rectifier circuit 45 and smoothes the DC voltage.

  A DC voltage smoothed by the smoothing capacitor 47 is supplied to the load 49. The load 49 corresponds to the power supply line 17. The load 49 has a DC load RL and is connected in parallel with the smoothing capacitor 47 between the DC output terminals of the rectifier circuit 45. In FIG. 3, Vdc indicates a DC voltage applied to the DC load RL.

  The first to third power supply lines 51, 53, and 55 connect between the three-phase AC power supply 43 and the rectifier circuit 45. Specifically, the first power supply line 51 is a U-phase AC power supply line of the three-phase AC power supply 43. The second power supply line 53 is a V-phase AC power supply line of the three-phase AC power supply 43, and the third power supply line 55 is a W-phase AC power supply line of the three-phase AC power supply 43.

  First to third AC reactors 57 (L1), 59 (L2), and 61 (L3) are connected in series to first to third power supply lines 51, 53, and 55 between three-phase AC power supply 43 and rectifier circuit 45, respectively. It is a reactor inserted in. Specifically, the first AC reactor 57 is inserted into the first power supply line 51, the second AC reactor 59 is inserted into the second power supply line 53, and the third AC reactor 61 is inserted into the third power supply line 55.

The connection line 63 connects the first to third power supply lines 51, 53, and 55 between the three-phase AC power supply 43 and the first to third AC reactors 57, 59, and 61.
In the present embodiment, the connection line 63 includes first to fourth connection lines 64, 65, 66 and 67. The first connection line 64 has a first end connected to the first power supply line 51 between the three-phase AC power supply 43 and the first AC reactor 57. The second connection line 65 has a first end connected to the second power supply line 53 between the three-phase AC power supply 43 and the second AC reactor 59. The third connection line 66 has a first end connected to the third power supply line 55 between the three-phase AC power supply 43 and the third AC reactor 61. The second end of the first connection line 64, the second end of the second connection line 65, and the second end of the third connection line 66 are connected to each other. The fourth connection line 67 is arranged to connect between the second end side of the first resonance reactor 69 in the first connection line 64 and the second end side of the second resonance reactor 71 in the second connection line 65. The Here, the second end of the first resonance reactor 69 is one end opposite to the first end on the first power supply line 51 side. The second end of the first resonant reactor 69 is one end opposite to the first end on the second power supply line 53 side.

The first to third resonance reactors 69 (L11), 71 (L22), and 73 (L33) are inserted in series in the first to third connection lines 64, 65, and 66, respectively, and the first to third AC reactors 57 and 59 are inserted. , 61 are arranged so as to be transformer-coupled. Specifically, the first resonant reactor 69 is inserted in series with the first connection line 64 and is disposed at a position facing the first AC reactor 57 so as to be transformer-coupled to the first AC reactor 57. That is, the first AC reactor 57 and the first resonance reactor 69 are electromagnetically coupled, and the voltage generated at both ends of the first AC reactor 57 by the electromagnetic induction action induces a voltage on the first resonance reactor 69 side. The second resonance reactor 71 is inserted in series with the second connection line 65 and is disposed at a position facing the second AC reactor 59 so as to be transformer-coupled to the second AC reactor 59. The third resonant reactor 73 is inserted in series with the third connection line 66 and is disposed at a position facing the third AC reactor 61 so as to be transformer-coupled to the third AC reactor 61.
Here, it is preferable that the coupling coefficient k of the first coupling transformer 81 configured by the first resonant reactor 69 and the first AC reactor 57 is 1. Alternatively, the coupling coefficient k may be a value as close as possible to 1, for example, 0.999. The coupling coefficient of the second coupling transformer 83 configured by the second resonant reactor 71 and the second AC reactor 59 and the coupling of the third coupling transformer 85 configured by the third resonant reactor 73 and the third AC reactor 61 are illustrated. The coefficient is the same as the coupling coefficient of the first coupling transformer 81.

  The first to third connection capacitors 75 (C1), 77 (C2), and 79 (C3) are inserted into the connection line 63 and disposed between the first to third resonance reactors 69, 71, and 73, respectively. Specifically, the first connection capacitor 75 is disposed between the first resonance reactor 69 and the third resonance reactor 73 so as to be inserted in series with the first connection line 64. The second connection capacitor 77 is disposed between the first resonance reactor 69 and the second resonance reactor 71 so as to be inserted in series with the fourth connection line 67. The third connection capacitor 79 is disposed between the second resonance reactor 71 and the third resonance reactor 73 so as to be inserted in series with the second connection line 65.

  Further, the first to third connection capacitors 75, 77, and 79 constitute a resonance circuit together with the first to third resonance reactors 69, 71, and 73. The parameters of the six elements of the first to third connection capacitors 75, 77, 79 and the first to third resonance reactors 69, 71, 73 are lower than the resonance frequency of the resonance circuit to be configured, and the three-phase AC power supply 43 Is set so as to resonate at a frequency two to three times the power supply frequency. By setting the parameters of the six elements in this way, when a voltage is generated in the first to third AC reactors 57, 59, and 61 due to the flow of the load current, the voltage is induced by the voltage induced through the transformer coupling. The bypass current flowing in the 1 to 3 resonance reactors 69, 71, 73 is changed by the same amount of current as the load current. Details will be described later.

(5-2) Operation of Power Supply Device Next, the operation of the power supply circuit of the power supply device 41 will be described. The same phenomenon is observed in each of the three phases of the three-phase AC power supply 43. Therefore, the U-phase AC power supply line which is the first power supply line 51 will be described below as an example. In FIG. 3, a first voltage Va, a second voltage Vb, and a third voltage Vc indicate voltage values from a three-phase AC neutral point, respectively. The power supply current flowing through the first power supply line 51 is referred to as a power supply current i11, the current flowing through the first AC reactor 57 is referred to as a load current i12, and the current flowing through the first connection line 64 and the first resonance reactor 69 is referred to as a bypass current i13. These currents have a relationship of power supply current i11 = load current i12 + bypass current i13.

(5-2-1) Example 1
The operation of the power supply circuit of the power supply device 41 in the first embodiment will be described with reference to FIG. 3 and further to FIGS. FIG. 4 is a diagram illustrating a parameter example of each element in the first embodiment. FIG. 5 is a diagram illustrating waveforms of the power supply current i11, the load current i12, and the bypass current i13 at the time of low load power in the first embodiment.

  As described above, in the power supply circuit of the power supply device 41, the first to third resonance reactors 69, 71, and 73 and the first to third connection capacitors 75, 77, and 79 integrally form a resonance circuit. The parameters of the first to third resonance reactors 69, 71, 73 and the first to third connection capacitors 75, 77, 79 are lower than the resonance frequency of the constituting resonance circuit and are the power supply frequency of the three-phase AC power supply 43. Are set so as to resonate at a frequency two to three times the frequency. Here, the frequency lower than the resonance frequency of the resonance circuit and 2 to 3 times the power frequency of the three-phase AC power source 43 is, for example, 137 Hz. Thus, by setting each parameter of the six elements and using a frequency that is lower than the resonance frequency of the constituting resonance circuit and that is two to three times the power frequency of the three-phase AC power source 43, a power supply device The following is realized in the 41 power supply circuits. That is, when a voltage is induced in the first to third resonance reactors 69, 71, 73 via the first coupling transformer 81 due to the load current i12 generated from the rectifier circuit 45, the bypass current i13 is changed to the load current i12. Can be changed by the same amount of current. In the present embodiment, the resonance frequency refers to a frequency at which the impedance of the resonance circuit constituted by the first to third connection capacitors 75, 77, 79 and the first to third resonance reactors 69, 71, 73 is minimized.

Specifically, in Example 1, as shown in FIG. 4, the first AC reactor 57 (L1), the second AC reactor 59 (L2), and the third AC reactor 61 (L3) are set to 1000 μH. The first resonance reactor 69 (L11), the second resonance reactor 71 (L22), and the third resonance reactor 73 (L3) are set to 1500 μH. The first connection capacitor 75 (C1), the second connection capacitor 77 (C2), and the third connection capacitor 79 (C3) are set to 300 μF.
In the first embodiment, the coupling coefficient k of the first coupling transformer 81 configured by the first AC reactor 57 and the first resonance reactor 69 is 0.999.

  First, when no load current is generated in the power supply circuit of the power supply device 41, a one-line sine wave current from the three-phase AC power supply 43 flows in the bypass current i13.

  Thereafter, when a voltage is applied to the diodes D1 and D2 of the rectifier circuit 45 and a load current is generated by the operation of the diodes D1 and D2, a current of the same amount as the generated load current is loaded as shown in FIG. The current i12 flows to the first AC reactor 57. Further, when the load current i <b> 12 flows through the first AC reactor 57, a voltage corresponding to the load current i <b> 12 is generated at both ends of the first AC reactor 57.

  The voltage generated at both ends of the first AC reactor 57 in response to the load current i12 induces a voltage in the first resonance reactor 69 by the first coupling transformer 81. Here, the coupling coefficient of the first AC reactor 57 and the first resonance reactor 69 employed in the first embodiment is k = 0.999. Therefore, the voltage induced in the first resonance reactor 69 is similar to the voltage generated at both ends of the first AC reactor 57, and the phase is inverted. As described above, the first to third connection capacitors 75, 77, and 79 and the first to third resonance reactors 69, 71, and 73 vary the bypass current i13 by the same amount as the load current i12 through the transformer coupling. Is set to let Therefore, when a current having the same amount as the load current i12 and having a phase inverted acts on the bypass current i13 that is a sine wave current, the waveform of the bypass current i13 is as shown in FIG. 5C. Distorted.

The distorted bypass current i13 flows in a direction that cancels the load current i12. That is, the first to third resonance reactors 69, 71, 73 and the first to third connection capacitors 75, 77, 79 have a frequency that is two to three times the power frequency of the three-phase AC power source 43 when viewed from the first voltage Va. Resonates at. Therefore, the third voltage Vc from the three-phase AC neutral point is constantly increasing, and as a result, the third voltage Vc is always in phase with the second voltage Vb and higher than the second voltage Vb. As a result, due to the potential difference between the third voltage Vc and the second voltage Vb, the distorted bypass current i13 flows in the direction that cancels the load current i12, that is, in the direction opposite to the arrow direction shown in FIG.
When the distorted bypass current i13 flows in this way, the load current i12 is canceled and the power source current i11 is always a sine wave. That is, since there is a relationship of power supply current i11 = load current i12 + bypass current i13, bypass current i13 cancels load current i12, and power supply current i11 has a sine wave as shown in FIG.

  With the above configuration, even if the load current i12 fluctuates, the bypass current i13 also fluctuates by the same amount as the fluctuation, so the power supply current i11 does not fluctuate and the power supply current i12 does not flow It becomes the same value as i11. As a result, the power supply current i11 is always a sine wave regardless of the generation of the load current i12, and the harmonic current in the power supply current i11 is suppressed. Note that, for reasons such as the non-linearity of the magnetic constants of the first AC reactor 57 and the first resonance reactor 69, some harmonic components remain in the power source current i11, but are slight.

The first AC reactor 57 and the first resonance reactor 69 are in a canceling relationship as inductance. Accordingly, since the first AC reactor 57 or the first resonance reactor 69 does not become the series impedance of the power supply system, stable power can be supplied.
As described above, the power supply device 41 according to the first embodiment can reduce both the power harmonic and the power fluctuation rate.
In addition, since only the passive elements have to be arranged between the three-phase AC power supply 43 and the rectifier circuit 45, the power supply device 41 that reduces the power supply harmonics and the power supply fluctuation rate with a simple configuration can be realized.
Furthermore, as described above, in Example 1, the frequencies of the resonance circuits of the first to third resonance reactors 69, 71, and 73 and the first to third connection capacitors 75, 77, and 79 are two to three times the power supply frequency. 137 Hz. When viewed from the three-phase AC power supply 43, the impedance of the resonance circuit can be regarded as a capacitor when the frequency is less than 137 Hz, and can be regarded as an inductance when the frequency is 137 Hz or more. Therefore, in this embodiment, the impedance of the resonant circuit is inducted in the fifth harmonic (250 Hz or 300 Hz) and the seventh harmonic (350 Hz or 420 Hz) that are remarkably generated in the three-phase rectification method frequently used in peripheral devices. Therefore, the possibility of adversely affecting peripheral devices can be reduced.

Next, the simulation result in Example 1 is demonstrated. Specifically, the current waveform and the total harmonic distortion rate at the time of low load power and high load power in Example 1 are shown. Moreover, the power supply fluctuation rate in Example 1 is shown.
As the simulation conditions, in addition to the conditions shown in FIG. 4, a power supply current i11 = 40.0 Arms and a DC load RL = 37Ω are adopted. Further, the coupling coefficient k = 0.999, the AC voltage of the three-phase AC power supply 43 = 200 Vac, and the frequency of the three-phase AC power supply 43 = 50 Hz are adopted.

ここでＩ１＝電源周波数電流値、ｎ＝次数、Ｉｎ＝高調波電流値である。
ＴＨＤ−Ｆがより低いほど、高調波成分が少なく電流波形に歪みが小さいことが示される。総合高調波ひずみ率は、各種規格の要請により、１３％以下であることが目標とされる。 Here, the total harmonic distortion factor (fundamental wave reference, hereinafter referred to as THD-F (Total Harmonic Distortion-Fundamental)) is the ratio of the harmonic component to the fundamental wave. THD-F is expressed by Equation 1 below.

Here, I1 = power frequency current value, n = order, In = harmonic current value.
It is shown that the lower the THD-F, the fewer the harmonic components and the less the distortion in the current waveform. The total harmonic distortion rate is targeted to be 13% or less as required by various standards.

なお、低負荷電力とは２．５ｋＷ〜２．９ｋＷであり、高負荷電力とは２４ｋＷ〜２５ｋＷを指す。 The power supply fluctuation rate indicates the output stability with respect to the fluctuation of the input voltage from the commercial power supply side. The power supply fluctuation rate is expressed by the following formula 2. Here, a direct current (DC) power supply fluctuation rate is obtained.

The low load power is 2.5 kW to 2.9 kW, and the high load power is 24 kW to 25 kW.

  The waveforms of the power source current i11, the load current i12, and the bypass current i13 at the time of low load power are as shown in FIG. Further, the waveforms of the power source current i11, the load current i12, and the bypass current i13 at the time of high load power are as shown in FIG. FIG. 6 is a diagram illustrating waveforms of the power supply current i11, the load current i12, and the bypass current i13 when the load power is high in the first embodiment. In the case of high load power, as in the case of low load power, the power supply current i11 has a substantially sine wave. That is, there is a relationship of power supply current i11 = load current i12 + bypass current i13, and the distorted bypass current i13 cancels the load current i12, so that the power supply current i11 is always substantially a sine wave.

  In addition, FIG. 7 shows the total harmonic distortion rate and the DC power supply fluctuation rate at the time of low load power and high load power in Example 1. FIG. 7 is a diagram illustrating the total harmonic distortion rate and the DC power source fluctuation rate at the time of low load power and high load power in Example 1. The total harmonic distortion rate is calculated using Equation 1 above. Further, the DC power supply fluctuation rate is calculated using the above-described Equation 2.

  As shown in FIG. 7, in Example 1, a simulation result was obtained that the total harmonic distortion factor at low load power was 3.1%, and the total harmonic distortion factor at high load power was 5.0%. . Thereby, it turns out that a harmonic component is improved in a present Example. That is, THD-F is targeted to be 13% or less according to various standards, but the target value can be realized in this embodiment as the simulation result. Further, the DC power supply fluctuation rate is 1.6%, and in the first embodiment, a stable power supply voltage with a sufficiently low DC power supply fluctuation rate can be provided. As described above, in the first embodiment, it can be confirmed from the simulation result that a good power supply device 41 in which both the power supply harmonics and the power supply fluctuation rate are sufficiently reduced can be provided.

(5-2-2) Other Examples Parameter examples of each element in other examples will be shown. FIG. 8 is a diagram illustrating an example of parameters of each element in another embodiment.

The power supply device 41 according to another embodiment has the same configuration as that of the first embodiment except that the parameters of each element are different from those of the first embodiment, and the operation thereof is also the same.
In the second embodiment, the first AC reactor 57 (L1), the second AC reactor 59 (L2), and the third AC reactor 61 (L3) are increased by 10% compared to the first embodiment and set to 1100 μH. . The first resonance reactor 69 (L11), the second resonance reactor 71 (L22), and the third resonance reactor 73 (L3) are set to 1500 μH, which is the same as in the first embodiment. The first connection capacitor 75 (C1), the second connection capacitor 77 (C2), and the third connection capacitor 79 (C3) are set to 300 μF, which is the same as in the first embodiment.

  In the third embodiment, the first AC reactor 57 (L1), the second AC reactor 59 (L2), and the third AC reactor 61 (L3) are set to 1000 μH as in the first embodiment. The first resonance reactor 69 (L11), the second resonance reactor 71 (L22), and the third resonance reactor 73 (L3) are increased by 10% compared to the first embodiment and set to 1650 μH. The first connection capacitor 75 (C1), the second connection capacitor 77 (C2), and the third connection capacitor 79 (C3) are set to 300 μF, which is the same as in the first embodiment.

  In the fourth embodiment, the first AC reactor 57 (L1), the second AC reactor 59 (L2), and the third AC reactor 61 (L3) are set to 1000 μH as in the first embodiment. The first resonance reactor 69 (L11), the second resonance reactor 71 (L22), and the third resonance reactor 73 (L3) are set to 1500 μH, which is the same as in the first embodiment. On the other hand, the first connection capacitor 75 (C1), the second connection capacitor 77 (C2), and the third connection capacitor 79 (C3) are increased by 10% compared to the first embodiment and set to 330 μF.

Example 5 is an example in which some parameters of the element of Example 1 are increased by 10%.
Specifically, the first AC reactor 57 (L1) and the third AC reactor 61 (L3) are increased by 10% compared to the first embodiment and set to 1100 μH, and the second AC reactor 59 (L2) embodiment. 1 is set to 1000 μH. Further, the first resonance reactor 69 (L11) and the third resonance reactor 73 (L3) are increased by 10% compared to the first embodiment and set to 1650 μH, and the second resonance reactor 71 (L22) is the same as that of the first embodiment. The same 1500 μH is set. Further, the first connection capacitor 75 (C1) and the third connection capacitor 79 (C3) are increased by 10% compared to the first embodiment and set to 330 μF, and the second connection capacitor 77 (C2) is the same as the first embodiment. It is set to 300 μF.

  The parameters of each element were set as described above, and the current waveform, the total harmonic distortion rate, and the power supply fluctuation rate at the time of low load power and high load power were estimated as in Example 1. As a result, in any of Examples 2 to 5, a simulation result was obtained that the power supply current at the time of low load power and at the time of high load power has a substantially sine wave. Moreover, the total harmonic distortion factor at the time of low load electric power and at the time of high load electric power obtained the favorable result of 10% or less in any of Examples 2-5. Furthermore, the DC power source fluctuation rate was as good as about 2% in any of Examples 2 to 5.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention. In particular, a plurality of embodiments and modifications described in this specification can be arbitrarily combined as necessary.

  INDUSTRIAL APPLICABILITY The present invention can be widely applied to a power supply device for non-contact power supply that supplies power to a traveling vehicle traveling in an automatic warehouse and a factory without contact.

DESCRIPTION OF SYMBOLS 1 Ceiling carrier system 3 Rail 5 Ceiling carrier 11 Traveling rail 13 Feeding rail 15 Feeding line holder 17 A pair of feeding line 21 A traveling part 23 A receiving part 25 A conveying body part 27 A pair of pickup units 29 A core 31 A pickup coil 41 A power supply Device 43 Three-phase AC power supply 45 Rectifier circuit 47 Smoothing capacitor 49 Load 51 First power supply line 53 Second power supply line 55 Third power supply line 57 First AC reactor 59 Second AC reactor 61 Third AC reactor 63 Connection line 64 1 connection line 65 2nd connection line 66 3rd connection line 67 4th connection line 69 1st resonance reactor 71 2nd resonance reactor 73 3rd resonance reactor 75 1st connection capacitor 77 2nd connection capacitor 79 3rd connection capacitor 81 1st 1 coupled transformer 83 2nd coupled transformer 85 3rd coupled transformer Nsu 101 inter-bay route 103 intra-bay 105 more processors 107 load port

Claims (2)

A rectifier circuit that converts a three-phase AC power source into DC,
First to third power supply lines connecting the three-phase AC power supply and the rectifier circuit;
First to third AC reactors inserted in series in each of the first to third power lines;
A connection line that connects the first to third power lines with each other between the three-phase AC power source and the first to third AC reactors;
First to third resonance reactors inserted in series in the connection line and arranged to be transformer-coupled to the first to third AC reactors;
First to third connection capacitors inserted between the connection lines and disposed between the first to third resonance reactors;
With
The first to third resonance reactors and the first to third connection capacitors constitute a resonance circuit, having a frequency lower than the resonance frequency of the resonance circuit and 2 to 3 times the power frequency of the three-phase AC power source. A power supply device for non-contact power supply in which parameters are set so as to resonate at a frequency. A rectifier circuit that converts a three-phase AC power source into DC,
First to third power supply lines connecting the three-phase AC power supply and the rectifier circuit;
First to third AC reactors inserted in series in each of the first to third power lines;
A connection line that connects the first to third power lines with each other between the three-phase AC power source and the first to third AC reactors;
First to third resonance reactors inserted in series in the connection line and arranged to be transformer-coupled to the first to third AC reactors;
First to third connection capacitors inserted between the connection lines and disposed between the first to third resonance reactors;
With
In the power supply device for non-contact power feeding, the first to third resonance reactors and the first to third connection capacitors constitute a resonance circuit.
Inducing a voltage in the first to third resonance reactors due to a load current generated from the rectifier circuit;
The resonance circuit is resonated at a frequency lower than the resonance frequency of the resonance circuit and at a frequency two to three times the power supply frequency of the three-phase AC power source, and the bypass current flowing through the first to third resonance reactors A step of canceling the load current;
A method for reducing power supply harmonics.

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