JP2010035292A - Inductive power receiving circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost inductive power receiving circuit, capable of using a small saturable reactor and efficiently charging an electric double-layer capacitor. <P>SOLUTION: The inductive power receiving circuit is equipped with: a power-receiving coil 32; a resonance capacitor 33, which forms a resonance circuit, resonating at the frequency of an inductive line 29 with the power- receiving coil 32; a saturable reactor 34, wherein a primary coil winding 43 having a core member for forming an annular magnetic path and wound around a core member so as to interlink the annular magnetic path is connected, in parallel with the power receiving coil 32 and one secondary coil winding 44 is provided penetrating through the through-hole at the center of the core member; and a rectifying circuit 35, which is connected to the secondary coil winding 44 of the saturable reactor 34, so as to supply a capacitor bank (electric double-layer capacitor) 38 with power. The saturated voltage of the core member of the saturable reactor 34 and the number of windings N of the primary coil winding 43 of the saturable reactor 34 are set, based on the rated voltage of and the maximum chargeable current of the capacitor bank 38. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an induction power receiving circuit of a contactless power supply facility using a saturable reactor or a composite reactor.

An example of an induction power receiving circuit using a conventional saturable reactor is disclosed in Patent Document 1.
The induction power receiving circuit disclosed in Patent Document 1 is a power receiving coil in which an electromotive force is induced from the induction line facing an induction line through which a high-frequency current flows, and a resonance that resonates with the frequency of the induction line together with the power receiving coil. A resonance capacitor that forms a circuit; and a core member that forms an annular magnetic path, wherein the coil winding is wound so as to be linked to the annular magnetic path, and is connected in parallel with the power receiving coil. A ring-shaped (doughnut-shaped) saturable reactor with an intermediate tap added to the rectifier, a rectifier circuit connected to the intermediate tap of the saturable reactor and supplying power to the load, and connected in parallel to the rectifier circuit and the load And a smoothing capacitor.

Thus, by using a saturable reactor with an intermediate tap in the induction power receiving circuit, the rated power can be arbitrarily set without increasing the load voltage of the saturable reactor, and the output terminal voltage of the saturable reactor, That is, the load voltage can be set to a desired value.
JP 2005-102378 A

  However, according to the conventional configuration described above, the output terminal voltage is adjusted by the number of turns of the intermediate tap added to the coil winding of the saturable reactor. The current that flows in the winding connected in parallel (secondary winding) becomes large, and it is necessary to use a wire with a large diameter for this secondary winding. Actually, the ring shape of the saturable reactor (doughnut shape) Difficulty occurs when it is wound around the core member. Therefore, it is necessary to make the core member large. As a result, there is a problem that the core member becomes heavy and it is difficult to secure an installation space. Therefore, the winding ratio between the primary winding and the secondary winding cannot be increased.

  Also, assuming a battery or an electric double layer capacitor as a load, the operating voltage is as low as 12 to 24V, which is far from the DC300V (AC220V) used in the conventional contactless power supply equipment in terms of voltage ratio, and the winding ratio is 20: 1 or more. Such transformers are large and expensive.

  Accordingly, an object of the present invention is to provide an inexpensive induction power receiving circuit that can use a saturable reactor using a small core member and can efficiently charge a battery or an electric double layer capacitor.

In order to achieve the above object, an induction power receiving circuit according to claim 1 of the present invention is provided with a power receiving coil in which an electromotive force is induced from the induction line opposite to the induction line through which a high-frequency current flows. An induction power receiving circuit that charges a battery or an electric double layer capacitor by an electromotive force induced by
A resonance capacitor that forms a resonance circuit that resonates with the frequency of the induction line together with the power receiving coil, and an annular core member that forms an annular magnetic path, and the core member is linked to the annular magnetic path. A saturable reactor in which a wound primary side coil winding is connected in parallel with the power receiving coil, and one secondary side coil winding is provided through a central through hole of the core member; A rectifier circuit connected to the secondary coil winding of the saturated reactor and supplying power to the battery or the electric double layer capacitor, the saturation voltage of the core member of the saturable reactor and the primary coil winding of the saturable reactor The number of turns is set based on the rated voltage of the battery or electric double layer capacitor and the maximum current at which the battery or electric double layer capacitor can be charged. It is obtained by the.

  When the voltage of the battery or electric double layer capacitor reaches the rated voltage, the charging current does not flow to the battery or electric double layer capacitor, the resonance voltage of the resonance circuit that supplies power to the battery or electric double layer capacitor rises, and resonance runaway occurs. Therefore, when the voltage of the battery or the electric double layer capacitor reaches the rated voltage, it is necessary to reduce the impedance of the saturable reactor, that is, to saturate the core member to avoid resonance runaway. The battery or the electric double layer capacitor has a charging current that can be charged.

  According to the above configuration, the saturation voltage of the core member of the saturable reactor is set by the rated voltage of the battery or the electric double layer capacitor, and the charging current to the battery or the electric double layer capacitor is within the range of the charging current that can be charged. The number N of turns of the primary side coil winding for charging the battery or the electric double layer capacitor is set so as to be maximum. Therefore, it is possible to obtain a saturable reactor that satisfies the characteristics of the battery or electric double layer capacitor to be used and can avoid resonance runaway. At this time, the secondary coil winding has the number of turns of the primary coil winding. N times the current flows, and the secondary side voltage of the saturable reactor is 1 / N of the primary side voltage. Therefore, the battery or the electric double layer capacitor can be charged with a low voltage and a large current, and charging is performed efficiently. be able to.

  Moreover, since the current N times that of the primary side coil winding flows through the secondary side coil winding, it is necessary to increase the wire diameter of the secondary side coil winding. Since the core member can be downsized, the space for installing the saturable reactor can be reduced, and an inexpensive induction power receiving circuit can be provided.

  An induction power receiving circuit according to a second aspect is the invention according to the first aspect, wherein the saturable reactor is disposed in the vicinity of the battery or the electric double layer capacitor.

  A current N times as large as that of the primary coil winding flows through the secondary coil winding of the saturable reactor. Therefore, since the secondary coil winding and the wire diameter of the electric wire to be connected are increased, it is difficult to lay the cable.

  According to the above configuration, by arranging the saturable reactor close to the battery or the electric double layer capacitor, the length of the secondary coil winding and the electric wire to be connected can be shortened, and the laying can be facilitated.

  The induction power receiving circuit according to claim 3 is the invention according to claim 1 or claim 2, wherein the high frequency current supplied to the induction line is determined by the voltage of the battery or the electric double layer capacitor being the rating. It is characterized by being cut off when the voltage is reached.

  According to the above configuration, the voltage of the battery or the electric double layer capacitor is set to the rated voltage (full charge voltage), and when the full charge voltage is reached, the high-frequency current supplied to the induction line is cut off and charging is terminated. , Unnecessary power consumption can be reduced. Even if the interruption is delayed, the saturable reactor becomes a saturation voltage, a large primary current flows, the primary voltage is kept constant, and resonance runaway is avoided.

  Furthermore, the inductive power receiving circuit according to claim 4 is the invention according to any one of claims 1 to 3, wherein the first core forms an annular magnetic path having a small magnetic resistance instead of the saturable reactor. A composite core having a member and a second core member that forms an annular magnetic path having a larger magnetic resistance than the first core member, and is wound so that the primary coil winding is linked to both annular magnetic paths in common It is characterized by having a reactor.

  According to the above configuration, the first core member has a magnetic resistance smaller than that of the second core member. Therefore, in the region where the first core member is not magnetically saturated, a magnetic field (magnetization) due to the current flowing in the primary coil winding is obtained. Force) exclusively generates a magnetic flux in the first core member, and in this state, the reactor exhibits a large inductance value. When the magnetic flux of the first core member is saturated, the inductance originating from the magnetic saturation of the first core member becomes almost zero, but the second core having a large magnetic resistance due to the magnetizing force due to the coil current that has started to increase rapidly. Since the magnetic flux is generated in the member, the inductance as the composite core reactor maintains a certain value. For this reason, even if the first core member is magnetically saturated, the current that rapidly increases in a pulse shape is suppressed, and the peak value of the pulse current flowing through the composite core reactor becomes small. Therefore, the pulse current is not so steep and excessive, and the action of voltage suppression works gently.

  When the characteristics of the battery or the electric double layer capacitor are set, the inductive power receiving circuit of the present invention can set a saturable reactor that satisfies this characteristic and can avoid resonance runaway. At this time, the secondary coil A current N times the number of turns of the primary side coil winding flows through the winding, and the secondary side voltage of the saturable reactor is 1 / Nth of the primary side voltage. The electric double layer capacitor can be charged efficiently and the secondary side coil winding needs to have a large wire diameter, but the secondary side coil winding needs to be passed through the core member through-hole and wound around the core member. Therefore, the core member can be downsized, the installation space for the saturable reactor can be reduced, and an inexpensive induction power receiving circuit can be provided.

Hereinafter, an induction power receiving circuit according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a travel route diagram of an article conveying facility provided with an induction power receiving circuit in a conveying cart according to an embodiment of the present invention, and FIG.

  1 and 2, reference numeral 11 denotes a pair of traveling rails installed on the floor 12, and 13 is a four-wheel transportation carriage (moving body of the moving body) that is guided by the traveling rails 11 and travels by itself to convey the article R. An example). Note that the total number of transport carts 13 is five.

  The travel rail 11 constitutes a conveyance path (an example of a movement path) 14 formed in a loop shape (annular), and a plurality of (9 in the figure) stations (article receiving means) 15 along the conveyance path 14. The transport carriage 13 constitutes a transport vehicle that travels along the transport path 14 and transports the article R across the stations 15 disposed along the transport path 14.

  In addition, each station 15 is provided with a transfer conveyor device (for example, a roller conveyor or a chain conveyor) 16 that transfers, that is, loads and unloads an article R to and from each transfer carriage 13.

  As shown in FIG. 2, the transport carriage 13 is installed on a vehicle body 21 and a transfer / loading conveyor device (for example, a roller conveyor or a chain conveyor) that is installed on the vehicle body 21 and transfers and loads an article R. ) 22, attached to the lower part of the vehicle body 21, two swivel driven wheel devices 23 that support the vehicle body 21 with respect to one traveling rail 11, and attached to the lower part of the vehicle body 21, Two swiveling / sliding driving wheel devices 24 that support the rail 11 and can follow the curved shape of the traveling rail 11 and can move to and away from the swiveling driven wheel device 23 (slidable); Used for exchanging signals between a traveling motor (an example of a load whose power consumption varies) 25 connected to one of these turning / sliding drive wheel devices 24 and a station 15. And a transmission unit 26A. The carriage 13 is driven by the driving motor 25.

  Further, for each station 15, an optical transmission device 26 </ b> B that transmits and receives signals to and from the optical transmission device 26 </ b> A of the transport carriage 13, and a cart detection sensor 27 that detects that the transport carriage 13 is stopped at the station 15. And a power supply device 28 for supplying a high-frequency current (alternating current) having a predetermined frequency (for example, 10 kHz), a pair of induction lines 29 to which a high-frequency current is supplied from the power supply device 28 extend from the station 15, and the traveling rail 11 Are arranged (arranged) vertically on the outer side surface along the traveling direction.

  The power supply device 28 detects that the carriage 13 is stopped before the station 15 by the carriage detection sensor 27, and inputs a charge command signal (described later) from the carriage 13 from the optical transmission device 26B. At this time, a high frequency current is supplied to the induction line 29.

  In addition, a pick-up unit 30 for inducing an electromotive force by the induction line 29 and supplying power to the traveling motor 25 is installed on each transport carriage 13 outside the one of the swivel driven wheel devices 23, thereby A power receiving circuit 31 is installed.

  The pickup unit 30 is a power receiving coil 32 that generates an induced electromotive force when a litz wire is wound around a central convex portion of a ferrite having an E-shaped cross section and placed in an alternating magnetic field having a constant frequency of about 10 KHz (FIG. 3). The guide line 29 is adjusted and fixed so that the guide line 29 is positioned at the center of both concave portions.

  As shown in FIG. 3, the induction receiving circuit 31 includes the receiving coil 32 and a resonance capacitor 33 that is connected in parallel to the receiving coil 32 and forms a resonance circuit that resonates with the receiving coil 32 at the frequency of the induction line 29. A saturable reactor 34 connected to the resonance capacitor 33, a rectifier circuit 35 connected to the saturable reactor 34, and a DC choke 36 having one end connected to the positive output terminal of the rectifier circuit 35, are provided. Connected between the other end of 36 and the negative output end of the rectifier circuit 35 is a capacitor bank 38 composed of M electric double layer capacitors 37 (M is an integer of 2 or more) connected in series.

An inverter 39 that drives the traveling motor 25 is connected to the capacitor bank 38 as a load to which DC power is supplied from the capacitor bank 38.
The saturable reactor 34 utilizes the saturation characteristic of a soft magnetic material. When the applied AC voltage exceeds a certain voltage, the inflow current increases rapidly, and the applied voltage is not increased. There is a function to suppress below. In the inductive power receiving circuit 31, a current flows into the saturable reactor 34 due to the applied resonant voltage, and the magnetic flux generated by the inflow current is saturated in the core, and the counter electromotive force of the reactor is lost, thereby causing an AC cycle. The inflow current suddenly increases at this time point, and by suppressing further accumulation of resonance energy in the induction power receiving circuit 31, it has a characteristic of suppressing an increase in the resonance voltage itself.

The configuration of the saturable reactor 34 is shown in FIG.
As shown in the figure, a primary side coil winding having an annular (doughnut-shaped) core member 42 having a through-hole (cavity) 41 at the center and forming an annular magnetic path and having input terminals 43A at both ends. 43 is wound so as to interlink with the annular magnetic path (coil winding number N; N is a number of 2 or more), and each input terminal 43A is connected to both ends of the resonance capacitor 33, respectively. One secondary coil winding 44 having an output terminal 44A at both ends is provided through the through hole 41 of the core member 42, and each output terminal 44A of the secondary coil winding 44 is a rectifier circuit. 35 is connected to the input terminal. The core member 42 is an amorphous alloy soft magnetic material or a nanocrystalline soft magnetic material {high permeability and high efficiency material, that is, maximum magnetic flux density is large, and core loss is small (BH characteristics have a small area surrounded by a hysteresis loop). ) Material} band is densely wound in the form of a roll, and the dimensions obtained by adding the thicknesses of the cores on both sides are formed so that the diameter of the through hole (cavity) 41 in the center of the core is substantially the same. .

  In order to dissipate the heat generated in the core member 42, a heat radiating plate 45 made of a low magnetic permeability material having a high thermal conductivity such as aluminum or copper or a low magnetic permeability material such as SUS304 is provided. The heat radiating plate 45 is also bent in an L shape so as to serve as a bracket. The main surface of the heat radiating plate 45 is larger than the outer diameter of the core member 42, and a hole 46 having substantially the same diameter as the through hole 41 of the core member 42 is formed. Yes. Also, a cylindrical hollow core material 47 (for example, a cylindrical core material made of paper or plastic), which is made of a flexible insulating material and has a diameter substantially equal to the diameter of the through hole 41 of the core member 42 and the diameter of the hole 46 of the heat radiating plate 45. ), The core member 47 is used as a positioning member, and the core member 47 is passed (aligned) through the through hole 41 and the hole 46 in the order of the core member 42 and the heat radiating plate 45, and then the core member 42 and the heat radiating plate 45. The primary side coil winding 43 made of a normal insulated wire (stranded wire) is wound so as to be linked to the annular magnetic path of the core member 42 using the holes 41 and 46 that are further aligned. .

With the above configuration, the output terminal voltage (output voltage) V ₂ of the saturable reactor 34 is transformed to a voltage lower than the input terminal voltage (input voltage) V ₁ . The output voltage (output voltage) _{V 2} is obtained by Equation (1). Further, the output terminal current (output current) I ₂ of the saturable reactor 34 is amplified by the input terminal current (input current) I ₁ , and the output current I ₂ is obtained by the equation (2).

V ₂ = V ₁ / N (1)
I ₂ = I ₁ × N (2)
Thus, since the current N times that of the primary side coil winding 43 flows through the secondary side coil winding 44, the wire diameter of the secondary side coil winding 44 is set to the wire of the primary side coil winding 43. It needs to be larger than the diameter. The output voltage V ₂ becomes the charging voltage V _DC of the capacitor bank 38 via the rectifier circuit 35, and the output current I ₂ becomes the charging current of the capacitor bank 38.
[Setting of the number of turns N and saturation voltage of the primary coil winding 43 of the saturable reactor 34]
The circuit of FIG. 3 will be described in principle. In FIG. 4 showing this principle, when the reactance Lo of the receiving coil 32 and the capacitance C ₀ of the resonant capacitor 33 are set to resonate with the frequency of the induction line 29 and the induction line current I ₀ is constant, current I _AC flowing to the resistive load R is a constant value irrespective of the value of the resistive load R. Further, the rated power Wo that can be supplied is determined from the induction line current Io, for example, 600 W.

Therefore, the input current I ₁ is constant depending on the electrical characteristics of the resonance circuit, and the maximum input voltage Vmax is obtained by dividing the rated power Wo by the input current I ₁ . Further, when the voltage of the capacitor bank 38 becomes the rated voltage, that is, the voltage at full charge (full charge voltage) Vf, the charging current does not flow to the capacitor bank 38, the resistance load R is regarded as infinite, and the resonance of the resonance circuit to avoid resonance runaway the voltages V ₁ increases and sets the saturation voltage of the saturable reactor 34. That is,
Output voltage (effective value) V ₂ = full charge voltage Vf
And At this time,
N × Vf = V ₁ ≦ Vmax
It is necessary to satisfy.

Since the capacitor bank 38 has a maximum charging current Imax that can be charged,
I ₁ (constant value) × N ≦ Imax
It is necessary to satisfy.

The higher the number of turns N of the primary winding 43 is large, the output current (secondary current) I ₂ becomes larger, since it can be carried out efficiently charge, the maximum number of turns N in the range satisfying Imax.

Now, assuming that the full charge voltage Vf, that is, the rated voltage of the capacitor bank 38 is 12 V, the maximum charge current Imax is 50 A, the input current I ₁ is 2 A, and the maximum input voltage Vmax is 300 V, the maximum number of turns of the primary winding 43. N is required to be 25. At this time, the saturation voltage V ₁ of the saturable reactor 34 is 300 V, and the charging current I ₂ flowing through the capacitor bank 38 is 50 A.

Thus, the saturation voltage of the saturable reactor 34 and the number of coil turns N are
-Rated power Wo that can be fed from the induction line 29,
A constant input current I ₁ due to the electrical characteristics of the resonant circuit,
-Full charge voltage (rated voltage) Vf of the capacitor bank 38,
The maximum charging current Imax that can charge the capacitor bank 38
Is set (adjusted).

  Further, a current N times as large as that of the primary coil winding 43 flows in the secondary coil winding 44 of the saturable reactor 34, so that the wire diameter of the secondary coil winding 44 and the electric wire to be connected increases. Therefore, the saturable reactor 34 is arranged close to the capacitor bank 38 to shorten the length of the electric wire.

  Further, as shown in FIG. 3, a control device 40 for controlling the inverter 39 to drive the traveling motor 25 and controlling the traveling of the transport carriage 13 is provided. Whether the control device 40 can drive the inverter 39 or not. Therefore, the voltage across the capacitor bank 38 is monitored. The control device 40 is supplied with power from the rectifier circuit 35 via the DC choke 36 or from the capacitor bank 38. Further, the control device 40 sends the charge command signal (whether to charge or not) to the power supply device 28 of the station 15 according to the state of the voltage across the capacitor bank 38 being monitored. , 26B. That is, when the voltage across the capacitor bank 38 becomes equal to or higher than the full charge voltage Vf, the charge command signal is turned off (no charge is required), and when the voltage falls below the full charge voltage Vf, the charge command signal is turned on (charge is required). As described above, the power supply device 28 detects that the conveyance carriage 13 is stopped before the station 15 by the carriage detection sensor 27, and is output from the conveyance carriage 13 via the optical transmission device 26B. When is turned on, a high frequency current is fed to the induction line 29, and when the charging command signal is turned off, the feeding is stopped to prevent unnecessary power consumption.

  The DC choke 34 has a characteristic that the inductance increases when the flowing current is small, and the inductance decreases when the flowing current is large. Therefore, when charging, when the voltage of the capacitor bank 38 is low and the charging current is large, the inductance is small, so that the capacitor bank 38 is efficiently charged without consuming the charging current, and then the voltage of the capacitor bank 38 is charged. Rises and approaches the full charge voltage Vf of the capacitor bank 38, and the charging current decreases, the inductance of the DC choke 34 increases and the voltage drop (voltage difference across the DC choke 34) increases.

Hereinafter, the operation in the above embodiment will be described.
The control device 40 of the transport carriage 13 uses the electric power stored in the capacitor bank 38 to control the inverter 39 to drive the travel motor 25 to cause the transport carriage 13 to travel and move between the stations 15. When it arrives (detailed control method is omitted), it is checked whether the voltage across the capacitor bank 38 is equal to or higher than the full charge voltage Vf, and when it is lower, a charge command signal (ON signal) is sent to the optical transmission device. The data is output to the station 15 via 26A and 26B.

  In each station 15, when the carriage 13 stops facing the station 15 and the carriage detection sensor 27 is turned on, the power supply device 28 turns on the charge command signal from the carriage 13 that is input via the optical transmission device 26 </ b> B. Check whether or not. When the charge command signal is on, the power supply device 28 supplies a high-frequency current to the induction line 29.

As a result, an induced electromotive force is generated in the receiving coil 32 by the magnetic flux generated in the induction line 29, and a constant current (input current I ₁ ) is saturable from the resonance circuit formed by the receiving coil 32 and the resonance capacitor 33. Power is supplied to the reactor 34 and the capacitor bank 38 is charged.

In the initial state in which the capacitor bank 38 is charged, the voltage (output voltage V ₂ ) of the capacitor bank 38 does not increase easily, and thus the N-fold input voltage V ₁ is lower than the saturation voltage. In the region where the saturable reactor 34 is not saturated as described above, the saturable reactor 34 operates as a transformer, and a charging current I _{2 that} is N times the constant input current I ₁ flows to the capacitor bank 38 and is charged. Is done.

Such charging is continued, the voltage rises in the capacitor bank 38, the voltage V ₂ approaches the rated voltage (fully charged voltage) Vf of the capacitor bank 38. As described above, since the output terminal voltage (output voltage; effective value) V ₂ of the saturable reactor 34 is set to the charging voltage V _DC (full charging voltage Vf) of the capacitor bank 38, the output voltage V ₂ The battery is charged even at a voltage between the effective value of 1 and the peak voltage (√2 × V ₂ ), and is charged to the peak voltage (√2 × V ₂ ) of the output voltage. However, as described above, when the voltage of the capacitor bank 38 increases and approaches the full charge voltage Vf of the capacitor bank 38, the voltage is greatly decreased by the DC choke 34 (the voltage difference between both ends of the DC choke 34 is increased). At the same time, since power is supplied to the control device 40 and constant power is consumed, the charging voltage _VDC of the capacitor bank 38 is not charged to the peak voltage (√2 × V ₂ ). In order to improve the charging efficiency, but the effective value of V ₂ of the output voltage is set to the full charge voltage Vf of the capacitor bank 38, a full charge voltage of the peak voltage of V ₂ output voltage capacitor bank 38 It may be set to Vf.

Then, the voltage rises in the capacitor bank 38, when the voltage V ₂ becomes the rated voltage (fully charged voltage) Vf of the capacitor bank 38, the control unit 40 of the transport carriage 13, turns off the charge command signal. At this time, the charging current I ₂ stops flowing.

When the charging command signal is turned off, the power supply device 28 of the station 15 stops the power supply to the induction line 29 and the charging is finished.
Further, even when the timing for turning off the charging command signal by the power supply device 28 is delayed, or when trouble occurs in the optical transmission devices 26A and 26B and the power supply stoppage is delayed, the input voltage V _{1 that} is N times the output voltage V _2. Becomes a saturation voltage, the saturable reactor 34 is saturated, and the impedance is reduced. This suppresses an increase in the amount of accumulated resonance energy by the power receiving coil 32 and the resonance capacitor 33 that form the resonance circuit, thereby reducing the resonance voltage (primary voltage). ) V ₁ is kept constant and resonance runaway is avoided.

According to the embodiment as described above, the rated power Wo capable feed from induction line 29, a constant input current I ₁ due to the electrical characteristics of the resonant circuit, the rated voltage (fully charged voltage) of the capacitor bank 38 and Vf, The saturation voltage of the saturable reactor 34 and the number of turns of the primary coil winding 43 based on the maximum charging current Imax that can charge the capacitor bank 38, that is, based on the conditions of the equipment and the characteristics of the capacitor bank 38 used. can set the N, thus the capacitor bank 38 can be efficiently charged at a low voltage (primary voltage V ₁ of the N content in 1) with a large current (N times the current of the input current I ₁ of the primary coil winding 43) , also become a fully charged voltage Vf can maintain the primary side voltages V ₁ to a constant voltage, it is possible to provide an induction incoming circuit capable of avoiding resonance runaway. The secondary side coil winding 44 needs to have a large wire diameter, but the secondary side coil winding 44 does not need to be passed through the through hole 41 of the core member 42 and wound around the core member 42. 42 can be reduced in size, so that the installation space of the saturable reactor 34 can be reduced, and an inexpensive induction power receiving circuit can be provided.

  Further, according to the embodiment, the secondary side coil winding 44 of the saturable reactor 34 is connected to the secondary side coil winding 44 by flowing a current N times as large as that of the primary side coil winding 43. Although the wire diameter becomes large and laying is difficult, the arrangement of the saturable reactor 34 close to the capacitor bank 38 shortens the length of the secondary coil winding 44 and the connected wire. And can be laid easily.

According to the embodiment, the voltage of the capacitor bank 38 is set to the rated voltage (full charge voltage) Vf, and when the voltage reaches the full charge voltage Vf, the high-frequency current supplied to the induction line 29 is cut off, and charging is performed. By being terminated, power consumption can be suppressed, and even if the interruption is delayed, the saturable reactor 34 becomes a saturation voltage, the primary voltage V ₁ can be maintained at a constant voltage, and resonance runaway can be avoided. .

  In the present embodiment, the saturable reactor 34 is used. However, instead of the saturable reactor 34, a first core member that forms an annular magnetic path with a small magnetic resistance, and a magnet that is magnetic from the first core member. It is also possible to use a composite core reactor that has a second core member that forms an annular magnetic path with high resistance and winds the primary coil winding 43 so as to be linked to both annular magnetic paths in common.

  At this time, since the first core member has a smaller magnetic resistance than the second core member, in the region where the first core member is not magnetically saturated, the magnetic field (magnetizing force) due to the current flowing in the coil winding is exclusively the first. Magnetic flux is generated in one core member, and in this state, the reactor shows a large inductance value. When the magnetic flux of the first core member is saturated, the inductance originating from the magnetic saturation of the first core member becomes almost zero, but the second core having a large magnetic resistance due to the magnetizing force due to the coil current that has started to increase rapidly. Since the magnetic flux is generated in the member, the inductance as the composite core reactor maintains a certain value. For this reason, even if the first core member is magnetically saturated, the current that rapidly increases in a pulse shape is suppressed, and the peak value of the pulse current flowing through the composite core reactor becomes small. Therefore, the pulse current does not become so steep and excessive, and the voltage suppression function works.

  In the present embodiment, each station 15 is provided with an induction line 29 and a power supply device 28 for point power supply. However, the induction line 29 and the power supply are provided for each of the plurality of stations 15 or according to the distance between the stations 15. A device 28 may be provided. At this time, it is not necessary to provide the power supply device 28 and the induction line 29 in each station 15, and the cost as equipment can be reduced.

  In the present embodiment, only one secondary coil winding 44 penetrates the core member 42, but several (2, 3) secondary coil windings 44 penetrate the core member 42. It may be wound around the hole 41. If it is several (2, 3), it can be wound around the through hole 41 of the core member 42 even if the wire diameter becomes large, but it goes without saying that the maximum transformation ratio can be taken with one. .

In the present embodiment, the charging target is the capacitor bank 38, but may be a battery.
Further, in this embodiment, the voltage rises in the capacitor bank 38, when the voltage V ₂ becomes the rated voltage (fully charged voltage) Vf of the capacitor bank 38, the control unit 40 of the transport carriage 13 outputs to the station 15 charge as an off-command signal to stop the power supply to the induction line 29, so that does not flow the charging current I _2. That is, when the voltage of the capacitor bank 38 (battery or electric double layer capacitor) reaches the rated voltage, the high-frequency current supplied to the induction line 29 is cut off. However, as shown in FIG. A switch 50 for short-circuiting both ends of the coil 32 (both ends of the resonance circuit) is provided, and the rated voltage (full charge voltage) Vf of the capacitor bank 38 is preset in the control device 40, and the voltage of the capacitor bank 38 being monitored is If the set rated voltage is (fully charged voltage) Vf, by short-circuiting both ends of the power receiving coil 32 drives the switch 50, is well supplied to the induction line 29 be configured not flow the charging current I ₂ The same effect as cutting off the high-frequency current can be obtained.

It is a running route figure of the article conveyance equipment provided with the dielectric power receiving circuit in an embodiment of the invention. It is a principal part block diagram of the goods conveyance equipment. It is a circuit diagram of the induction | power receiving circuit of the goods conveyance equipment. It is principle explanatory drawing of the induction | guidance | derivation receiving circuit of the goods conveyance equipment. It is a perspective view of the variable reactor used for the induction | guidance | derivation receiving circuit of the goods conveyance equipment. It is a circuit diagram of the induction | guidance | derivation receiving circuit of the articles | goods conveyance installation in other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Traveling rail 13 Conveyance cart 14 Conveyance route 15 Station 21 Car body 25 Traveling motor 26A, 26B Optical transmission device 27 Dolly detection sensor 28 Power supply device 29 Induction line 31 Induction power reception circuit 32 Receiving coil 33 Resonance capacitor 34 Saturable reactor 35 Rectification circuit 36 DC choke 37 Electric double layer capacitor 38 Capacitor bank 39 Inverter 40 Control device 41 Through hole (cavity)
42 Core member 43 Primary coil winding 44 Secondary coil winding 45 Heat sink 50 Switch

Claims (4)

An inductive power receiving circuit that is provided with a power receiving coil for inducing an electromotive force from the induction line opposite to an induction line through which a high-frequency current flows, and charges a battery or an electric double layer capacitor by the electromotive force induced in the power receiving coil. ,
A resonant capacitor that forms a resonant circuit that resonates with the frequency of the induction line together with the power receiving coil;
An annular core member forming an annular magnetic path, and a primary coil winding wound around the core member so as to be linked to the annular magnetic path is connected in parallel with the power receiving coil; A saturable reactor in which a secondary coil winding is provided through the central through hole of the core member;
A rectifier circuit connected to the secondary coil winding of the saturable reactor and supplying power to the battery or the electric double layer capacitor;
The saturation voltage of the core member of the saturable reactor and the number of turns of the primary coil winding of the saturable reactor, the rated voltage of the battery or electric double layer capacitor, and the maximum chargeable voltage of the battery or electric double layer capacitor An inductive power receiving circuit characterized in that it is set based on a current. The inductive power receiving circuit according to claim 1, wherein the saturable reactor is disposed in proximity to the battery or the electric double layer capacitor. 3. The induction power receiving circuit according to claim 1, wherein the high frequency current supplied to the induction line is cut off when a voltage of the battery or the electric double layer capacitor reaches the rated voltage. In place of the saturable reactor, the first core member that forms an annular magnetic path with a small magnetic resistance, and the second core member that forms an annular magnetic path with a larger magnetic resistance than the first core member, The induction power receiving circuit according to any one of claims 1 to 3, further comprising a composite core reactor in which the primary coil winding is wound so as to interlink with both annular magnetic paths in common.

Images