JP3491177B2 - Contactless power supply system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply line connected to a power supply, and to a load such as a motor of a plurality of transport vehicles, which is physically disconnected from the power supply line. for non-contact power supply system <br/> arm for feeding electricity through each pickup husband is inductively coupled people in a state of contact. 2. Description of the Related Art FIG. 10 is a front view showing a relationship between a guide rail and a carrier in a conventional monorail type carrier.
FIG. 11 is an enlarged cross-sectional view showing the relationship between a feeder line provided on a guide rail and a pickup unit provided on a carrier. In FIG. 11, reference numeral 1 denotes a guide rail, and reference numeral 2 denotes a carrier. [0003] The guide rail 1 is formed in an I-shaped cross section, and is installed on a ceiling or the like of a factory by a supporting arm 11 mounted at substantially constant intervals in the longitudinal direction along one side surface thereof. A guide line 12 extending along the other side of the guide rail 1 in the longitudinal direction thereof is fixed. [0004] On the other hand, the carrier 2 is provided with a predetermined distance before and after the traveling direction thereof.
The carrier 23 is passed over a pair of U-shaped vehicle body frames 21 (only one side is shown in FIG. 10) holding the U-shaped body so that a transported object (not shown) is detachably supported on the carrier 23. It has become. [0005] A drive trolley 21a which is in contact with the upper end surface of the guide rail 1 is mounted on the body frame 21 at a position facing the upper end surface.
But also at a position facing the lower end both side surfaces of the guide rail 1,
A pair of steadying rollers 21b, 21 which come into contact with this side surface
b, and a pickup unit 24 is provided at a position facing the guide line 12, and a drive trolley 21a is provided on the upper end surface of the guide rail 1, and anti-sway rollers 21b, 2b are provided.
The guide rails 1b are mounted on the guide rail 1 in a state where they are in contact with the lower end sides of the guide rail 1 respectively, and the pickup unit 24 faces the guide line 12. The drive trolley 21 is mounted on the upper part of the body frame 21.
a motor M connected to the control unit a is mounted, and a control unit (not shown) and the motor M are driven by the electric power supplied through the pickup unit 24 to rotate the drive trolley 21 a to move the carrier 2 along the guide rail 1. To run. As shown in FIG. 11, the guide line 12 is composed of two supporters 12 protruding laterally at predetermined intervals upward and downward from a mounting plate 12a fixed to the other side surface of the guide rail 1.
A single line is stretched over each of the ends b and 12c in a loop shape. A line on one side of the guide line 12 stretched in a loop shape is a feed line 12d, and a line on the other side is a feed line 12e. On the other hand, the pickup portion 24 has a pickup coil 24g wound around a central protrusion 24d of plate-like protrusions 24b, 24c, 24d provided at the upper, lower, and central portions of a pickup core 24a formed in an E-shaped cross section. I have. FIG. 12 is an electric circuit diagram of the monorail type transfer equipment. The power supply side includes a three-phase AC power supply 71, a converter 72, a sine wave resonance inverter 73, and the like. The converter 72 is a set of two for full-wave rectification.
A set of diodes 72a, a coil 72b, a capacitor 72c, and a resistor 72d forming a low pulse filter;
And a transistor 72e for short-circuiting the resistor 72d. The sine wave resonant inverter 73 includes transistors 73a and 73b which are alternately driven, a current limiting coil 73d, a current supply coil 73f connected to the transistors 73a and 73b, and power supply lines 12d and 12b.
e and a capacitor 73c forming a parallel resonance circuit. On the other hand, the power receiving side is a pickup coil 24g.
A rectifier 82 composed of a diode, a stabilizing power supply circuit 83 for controlling the output of the rectifier 82 to a predetermined voltage, and a motor M for driving the transport vehicle 2 via an inverter 84 are connected to a resonance circuit composed of I have. The stabilized power supply circuit 83 includes a current limiting coil 83a, an output adjusting transistor 83b, and a capacitor 83d. In such a conventional apparatus, the three-phase ACV of ACV output from the AC power supply 71 is converted into DC by the converter 72, and the sine wave resonant inverter 7
3, the signal is converted into a high frequency, for example, a 10 KHz sine wave, and supplied to the power supply lines 12d and 12e. Power supply line 12
When the power is supplied to the power supply lines 12d and 12e, a magnetic field is formed around the power supply lines 12e and 12e, and a large electromotive force is generated in the pickup coil 24g that resonates at the frequency of the power supply lines 12d and 12e. The electric power is converted into an alternating current at 84 and supplied to the motor M, so that the carrier 2 travels along the guide rail 1. By the way, when a plurality of loads are driven by the inductive coupling as described above, that is, a so-called series load drive is performed, when one load is in an open state or a state close to the open state, the total voltage supplied to the power supply line is reduced. There is a problem in that the power is applied to the load pickup unit 24 and adversely affects the power supply to the other driven loads. As a countermeasure against this, conventionally, a method using a regulator circuit (for example, a shunt regulator, a ferro-resonant transformer) for keeping the output voltage to the power receiving side constant regardless of the load fluctuation (US Pat. No. 4,914,539, USP 48)
33338, US Pat. No. 3,904,454), a method of coupling or decoupling a pickup unit and a power supply line to perform power adjustment (Japanese Unexamined Patent Publication No.
Various methods have been proposed, such as Japanese Patent Application Laid-Open No. 506099 and Japanese Patent Application Laid-Open No. 55-119393, and a method for preventing the load itself from being opened (Japanese Patent Application Laid-Open No. 2-15087). Among these methods, the following three methods are disclosed in Japanese Patent Application Laid-Open No. 6-506099 as a method for coupling or decoupling the above-described pickup unit and the power supply line. (A) a method of physically moving the pickup coil with respect to the power supply line; (b) a separation coil wound around the outer periphery of the pickup coil, and a switch for switching the separation coil between an open circuit and a short circuit is provided; Switching this switch to vary the power transferred between the feeder line and the pickup coil. (C) Consisting of a capacitor, an inductor and a switch connected in series with the capacitor. A method is disclosed in which the power transmitted and received between a feeder line and a pickup coil is changed by switching a circuit composed of the pickup resonance circuit and an open circuit. However, in the case of the method (a), a means for moving the pickup coil and a space for moving the pickup coil are required, which increases the size and cost. Further, since the pickup coil has a movable structure, there is a problem that maintenance and inspection are required and reliability is low. Further, in the case of the method (b) using the switching of the isolation coil as the second winding, and in the case (c) of the method of turning on / off the pickup resonance circuit, the switch is provided in each case.
Since each of them is a switch as an active element, there is a problem that a load fluctuation and a frequency fluctuation of a power supply unit occur, and in particular, there is a problem that noise cannot be avoided in a contact type. The present invention has been made in view of the above circumstances, and an object of the present invention is to eliminate a switch as an active element, to reduce a load fluctuation and a frequency fluctuation of a power supply unit, and to prevent an influence of noise. It is an object of the present invention to provide a contactless power supply system capable of obtaining high reliability. [0014] Non-contact power according to the present invention
Supply system, power from the connected feed line to the power supply, to a load via the pickups unit which is inductively coupled with fed-wire
The non-contact power supply system for supplying, with the feed line to the constant current circuit section for supplying a constant current, provided between the front Kipi Kkua'<br/> flop unit load, induced in the pickups portion a constant current circuit unit for obtaining a constant current from the electric power, comprising a constant voltage converter to provide a constant current from the constant current circuit to the load is converted into a constant voltage, the voltage conversion unit is a passive element the constant Success
Characterized by an impedance conversion circuit . According to the present invention, a constant current is supplied to the power supply line from the constant current circuit portion, and the constant current circuit portion is also provided between each pickup and the load inductively coupled to the power supply line. And a constant voltage converter, one of the loads to be supplied with power is in an open state, or in a state close to the open state, so that the entire voltage of the power supply line is not applied to the load, and the other load is The adverse effects are prevented. The present invention will be specifically described below with reference to the drawings showing the embodiments. FIG. 1 is a schematic view showing a monorail type transfer system to which the present invention is applied, FIG. 2 is a side view showing the relationship between a guide rail and a transfer vehicle, FIG. 3 is a front view thereof, and FIG. It is an expanded sectional view which shows the inductive coupling structure of FIG. In the figure, reference numeral 1 denotes a guide rail constituting a monorail type transport system in a factory, 2 denotes a transport vehicle, and 3 denotes a system controller. The guide rail 1 is laid so as to form a multiplex loop by connecting stations (not shown) corresponding to the purpose of conveyance, and a switch for selectively using one of the intersections at each intersection.
A rail type branching / merging unit 4 is provided. The guide rail 1 has a substantially I-shaped cross section. Support arms 11 are attached to one side surface of the guide rail 1 at substantially constant intervals in the longitudinal direction, as shown in FIG. It is installed in a state of being hung on a ceiling or the like. A guide line 12 is fixed to the other side surface of the guide rail 1 over the same entire length in the longitudinal direction, and is connected to the primary power supply unit 7 shown in FIG. As shown in FIG. 4, the guide line 12 is a pair of supporters 12b projecting laterally at a predetermined interval upward and downward from one side of a mounting plate 12a screwed to the other side of the guide rail 1. , 12c, and extends over the line in a loop. One side of the looped line is a power supply line 12d, and the other side is a power supply line 12e. The power supply lines 12d and 12e are formed by covering an electric wire composed of a stranded wire formed by bundling insulated thin wires with a resin material. On the other hand, as shown in FIGS. 2 and 3, the carrier 2 is provided with a carrier 23 that detachably mounts the object G to be transferred across a pair of body frames 21 and 22 before and after forming a U-shape in a front view.
Is suspended. The body frame 21 is provided with a drive trolley 21a which is in contact with the upper part of the body rail 21 at a position facing the upper surface of the guide rail 1.
A pair of steady rest rollers 21b and 21c are respectively provided at positions opposed to the upper and lower side surfaces, and a motor M connected to the drive trolley 21a is fixed to the upper portion. Further, pickup portions 24 are provided on the sides of the body rails 21 facing the power supply lines 12d and 12e of the guide rail 1, respectively. As shown in FIG. 4, the pickup portion 24 includes upper and lower protrusions 24 b, 24 of a pickup core 24 a made of a magnetic material such as ferrite and formed in an E-shaped cross section.
c, backs 24h and 24f connecting the central projection 24d, respectively.
In other words, the pickup coil 24g is wound around the inner deep wall of each of the recesses facing the power supply lines 12d and 12e. The number of turns, wire diameter, and the like of the pickup coil 24g are set as necessary. This pickup coil 2
4g faces the peripheral surfaces of the power supply lines 12d and 12e at a predetermined interval when the carrier 2 is mounted on the guide rail 1, and is formed around the power supply lines 12d and 12e by energizing the power supply lines 12d and 12e. The electric power induced in the pickup coil 24g by being located in the magnetic field is supplied to the motor M. On the other hand, a driven trolley 22a that is in contact with the upper portion of the body frame 22 and that is opposed to the upper surface of the guide rail 1 is located at the upper portion of the body frame 22. It has a steady rest roller (not shown) that is in rolling contact with the rest. The system controller 3 controls the transport vehicle to carry the transported object G from one station to another target station. The system controller 3 controls loading and unloading of the transport vehicle. In addition to instructing the work, it outputs a control signal for securing a traveling route, and instructs a station controller (not shown) installed in each station to transfer the transferred object G, In addition to supervising the operation of the entire system and ensuring safety, it also has a function to issue an alarm when a failure occurs. The branching / merging controller 5 is for controlling traffic among the plurality of transport vehicles 2 and is installed at a place where traffic control is required, for example, at a branching portion or a merging portion. The other 6 is a repair line. The repair line 6 branches and joins the transporting vehicle 2 requiring maintenance and inspection.
For guiding from the guide rail 1 to perform maintenance. FIG. 5 is a block diagram showing a schematic configuration of a power supply / reception structure between the guide rail 1 and the carrier 2 in the monorail type carrier system shown in FIG. The power supply unit 7 is installed on the ground together with the system controller 3 and the like, and supplies a high-frequency constant current to power supply lines 12 d and 12 e constituting the induction line 12. The pickup unit 24 receives power from the power supply lines 12 d and 12 e by inductive coupling, and supplies power to the motors of the respective transport vehicles 2 via the power receiving unit 8. FIG. 6 is a circuit diagram showing a specific configuration of the power supply unit 7 shown in FIG. 5, which is configured as a thyristor bridge by combining six thyristors, and rectifies a commercial three-phase AC to obtain a DC voltage. Unit 41, a capacitor 42 for smoothing the output of the rectification unit 41, and an inverter conversion unit 43 configured by combining four power transistors in a bridge to switch a DC voltage and generate a high-frequency voltage of a predetermined frequency; An impedance matching transformer unit 44 for performing isolation (floating); a rectifying unit gate unit 45 for controlling the rectifying unit 41; a high-frequency gate unit 46 for controlling the inverter converting unit 43; The impedance matching transformer section 44
Are connected to the above-described feeder lines 12d and 12e via a resonance capacitor CR. Rectifier gate unit 45 is 3-phase AC power supply lines R, S, is connected to a T, respectively, are connected to the current detector CT ₃ provided in the feed line 12e, detected by said current detector CT ₃ outputs a control signal to the gate terminal G ₁ ~G ₆ of the thyristors, a fixed frequency sinusoidal constant current by feedback control of the thyristor is supplied to the power supply line 12d, 12e in order to adjust the DC voltage based on the current . FIG. 7 shows a power receiving unit 8 mounted on the carrier 2.
FIG. 4 is an electric circuit diagram showing the configuration of the power supply lines 12d and 12e.
In contrast, the respective pickup units 24 of the plurality of transport vehicles 2 are inductively coupled. The configuration of each carrier 2 is substantially the same, one of which will be described. The power receiving unit 8 receives electric power induced in the pickup unit 24 from a magnetic field formed around the power supply lines 12d and 12e by energizing the power supply lines 12d and 12e, and receives a pickup resonance circuit unit 51 functioning as a constant current circuit unit and a constant current circuit unit. An impedance converter 52 converts a constant current, which is an output of the circuit, into a constant voltage, a full-wave rectifier 53 that converts a high-frequency constant voltage source into a direct current, a smoothing circuit 54, and the like. The smoothing circuit section 54 includes choke coils 54a,
It is composed of a capacitor 54b and a bleeder resistor 54c. The configuration of the other power receiving units 8 is also substantially the same, and corresponding parts are denoted by the same reference numerals and description thereof is omitted. Next, the operation of the wireless power supply system according to the present invention will be described. The power supplied from the three-phase AC power supply through the power lines R, S, and T is rectified by the rectifier 41 and converted into a predetermined DC voltage corresponding to the power. Feed line 1 as a sine wave constant current
Power is supplied to 2d and 12e. On the other hand, the pickup section 24 supplies the electric power induced in the pickup coil 24g in the magnetic field to the impedance conversion section 52 as a constant current in the pickup resonance circuit section 51. The impedance converter 52 converts a constant current to a constant voltage,
And the high-frequency constant voltage is converted to DC by the smoothing circuit unit 54,
Supply to motor M etc. As a result, even if the load of the motor M changes, a constant voltage is always applied to the other driving motor M, and the load fluctuation of one motor M causes the other driving motor M to change.
Does not affect the driving state of the device. FIG. 8A shows the power supply line 12d in FIG.
FIG. 8B is an explanatory diagram showing the relationship between 12e and the pickup resonance circuit unit 51, which is modeled as shown in FIG. 8B. In FIG. 8B, ω (L ₁ + L ₃ ) = 1 /
Assuming that the resonance capacitor 51a is selected so as to be ωC _P , the following equation (1) holds between the voltages V ₁ and V ₃ . [Equation 1] From the equation (1), I ₃ and I ₁ and V ₁ and V ₃ can be expressed as in the following equations (2) and (3). ## EQU2 ## [0033] (2) Since I ₁ is a constant current in equation becomes I ₃ = constant, a pickup resonance circuit 51 constituted by an L _P and C _P functions as a constant current source. FIG. 8 (c) shows the equivalent circuit of FIG. 8 (b). FIG. 9 is an explanatory view of the impedance converter, the voltage V ₃ across the capacitor C _11, also the current I ₃ is applied, the voltage V ₅ current I ₅ is applied to both ends of the capacitor C ₁₂ , ΩL _I = 1 / ωC ₁₂ , and C ₁₁ = C ₁₂
When selecting the capacitor C _11, C ₁₂ such that V _3,
The relationship shown in the following equation (4) is established between I ₃ and I ₅ . ## EQU3 ## From now on, V ₃ and V ₅ are respectively expressed by the following (5),
It can be expressed as in equation (6). V ₃ = jωL ₁ · I ₅ (5) Since I ₃ = constant as described above, V ₅ =
It becomes constant, and the output of this impedance converter becomes a constant voltage. That is, a constant voltage is applied to each motor M regardless of the load. Even if one of the plurality of transport vehicles 2 stops, for example, the load is released, that is, even if I ₅ = 0, the voltage applied to the power supply line of the pickup unit 24 becomes V ₃ according to the equation (5). = 0, and a constant current is supplied to the other driving carrier 2 through the pickup resonance circuit unit 51 to the impedance conversion unit 52, where it is converted to a constant voltage and supplied to the other driving motor M. In other words, stopping one carrier does not adversely affect the driving state of the other carrier. [0039] In the contactless power supply <br/> system according to the present invention as described above INVENTION Effect of ## and constant current circuit unit for supplying a constant current to the feeder, and the pickups part load and et al provided between the
Is, includes a constant current circuit unit from the power induced in the pickups unit obtaining a constant current, a constant voltage conversion unit providing a constant current from the constant current circuit to the load is converted into a constant voltage, the Set
The voltage converter is an impedance conversion circuit composed of passive elements
Since it is, even if one load of a plurality of load varies constantly constant voltage is prevented can affect the driving is given to the load during the other drive, the drive of stable load It has an excellent effect that can be maintained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a monorail type transfer facility to which a contactless power supply system according to the present invention is applied. FIG. 2 is an enlarged side view showing a relationship between a guide rail and a carrier in a monorail type carrier system. FIG. 3 is an enlarged front view showing a relationship between a guide rail and a traveling vehicle. FIG. 4 is a schematic diagram showing a relationship between a guide line of a guide rail and a pickup unit of a traveling vehicle. FIG. 5 is a block diagram showing a power supply facility. FIG. 6 is a circuit diagram showing details of a power supply unit. FIG. 7 is a circuit diagram illustrating details of a power receiving unit. FIG. 8 is an explanatory diagram of a power supply line and a pickup resonance circuit unit. FIG. 9 is an explanatory diagram of an impedance conversion unit. FIG. 10 is a front view showing a relationship between a guide rail and a traveling vehicle in a conventional system. FIG. 11 is a schematic cross-sectional view showing a relationship between a power supply line and a pickup unit in a conventional system. FIG. 12 is an electric circuit diagram of each of a power supply unit and a power reception unit of a conventional system. [Description of Signs] 1 Guide rail 2 Car carrier 3 System controller 4 Branching / merging unit 5 Branching / merging controller 6 Repair line 11 Support arm 12 Guide line 21, 22 Body frame 24 Pickup unit 24g Pickup coil 41 Rectification unit 42 Capacitor 43 Inverter conversion unit 44 Impedance matching transformer unit 45 Rectification unit gate unit 46 High-frequency gate unit 51 Pickup resonance circuit unit 52 Impedance conversion unit 53 Full-wave rectification circuit unit 54 Smoothing circuit unit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuo Kawamatsu 4-17-96 Tsurumi-ku, Tsurumi-ku, Osaka-shi, Osaka Inside Tsubakimoto Chain Co., Ltd. (72) Inventor Juichi Irie 463-7 Ichicho, Kawachinagano-shi, Osaka (56 References JP-A-7-227004 (JP, A) JP-T-6-506099 (JP, A) U.S. Pat. No. 4,914,539 (US, A) WO 93/23909 (WO, A1) WO 96/20526 (WO , A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02J 17/00 B60L 5/00 B60M 7/00 B65G 43/00 H01F 38/14

Claims (1)

(57) From Claims 1] connected to the feed line to the power supply, the power to the load via the pickups unit which is inductively coupled with fed-wire
The non-contact power supply system, and the feed line to the constant current constant current circuit section for supplying, prior disposed between the Kipi Kkuappu unit and the load, a constant current from the power induced in the pickups portion a constant current circuit unit, the constant current from the constant current circuit is converted into a constant voltage and a constant voltage converter to be supplied to the load, the constant-voltage converter is composed of passive elements to obtain
A non-contact power supply system, which is an impedance conversion circuit .