JP5170451B2 - Induction power receiving circuit - Google Patents

Description

  The present invention relates to an inductive power receiving circuit of a contactless power supply facility including a battery and an electric double layer capacitor.

An example of an inductive power receiving circuit including a battery and an electric double layer capacitor is disclosed in Patent Document 1 among conventional inductive power receiving circuits of a non-contact power supply facility.
The inductive power receiving circuit disclosed in Patent Document 1 is mounted on a mobile body, receives power without contact from an induction line that lays along the moving path of the mobile body and passes a high-frequency current, and loads the mobile body ( For example, a circuit for charging and discharging a storage battery while being supplied to a driving driver and motor), and a power receiving coil wound around a ferrite core disposed in proximity to the induction line, and connected in parallel to the power receiving coil A resonant capacitor, a rectifier connected in parallel to the resonant capacitor, a constant voltage circuit that controls the current output from the rectifier to a predetermined voltage, and a storage battery connected in parallel to the constant voltage circuit.

  With this configuration, when a current is passed through the induction line, an induced electromotive force is generated in the receiving coil due to the magnetic flux generated around the induction line, and the receiving coil and the resonant capacitor output an alternating constant current by receiving this induced electromotive force. The constant current is rectified by the rectifier, and the constant voltage is regulated to a predetermined voltage by the constant voltage circuit and supplied to the motor through the driver, and the storage battery is charged.

The storage battery discharges the charged power and drives the motor optimally when the load increases or when the current or voltage of the induction line decreases.
However, since the inductive power receiving circuit disclosed in Patent Document 1 is not provided with means for controlling charging / discharging of the storage battery, as long as power is continuously supplied to the motor, for example, the storage battery is insufficiently charged and has a large load. Even if it becomes, the storage battery is always charged. That is, depending on the case, there is a possibility that power cannot be sufficiently supplied to the motor. In addition, the storage battery may discharge even when the power supply to the motor is sufficient, and there is a possibility that sufficient power supply to the motor cannot be performed due to insufficient charging when power supply by discharge is required. .

An inductive power receiving circuit for eliminating such fear is disclosed in Patent Document 2.
Patent Document 2 is provided with means for controlling charging / discharging of a storage battery. That is, a detecting means for detecting a voltage (output terminal voltage) of an output terminal of an induction power receiving circuit to which a traveling motor or driver is connected, and an output terminal voltage detected by the detecting means is equal to or higher than a first reference voltage value. Determining means for determining whether or not there is a second reference voltage value lower than the first reference voltage value, and the terminal voltage determined by the determining means is the first reference voltage When the value is equal to or greater than the value, the charging means for charging the storage battery, and when the terminal voltage determined by the determination means is equal to or lower than the second reference voltage value, the power charged in the storage battery is discharged. Discharge means is provided.

The output terminal voltage detected by the detecting means by the structure of the means for controlling charging / discharging of the storage battery. Is determined to be equal to or higher than the first reference voltage value, the charging means charges the storage battery, supplies the induced electromotive force directly to the load of the mobile body, and outputs the output terminal voltage. Is determined to be equal to or lower than the second reference voltage value, the discharging means discharges the electric power charged in the storage battery, thereby supplying the electric power generated by the discharge of the storage battery to the load of the mobile body.

  As a result, by charging the storage battery when the power supplied to the load of the mobile body is small, the storage battery can be charged without affecting the driving of the load, and when the load is large, the storage battery is discharged. Thus, it is possible to supply appropriate power to the load. In addition, since it is not necessary to cover the maximum load power of the moving body with only the induction line, the current flowing through the induction line can be reduced, and the system can be reduced in size and cost.

  In addition, the rated voltage (output terminal voltage) of the induction power receiving circuit is, for example, DC300V, and is far from the rated voltage of the storage battery (DC48V in Patent Document 2). The battery is charged by controlling the voltage and current. That is, charging is performed by stepping down DC300V to DC48V. And in the case of discharge, the booster circuit which boosts the voltage of a storage battery to an appropriate voltage (250-300V) and supplies electric power to a load is provided.

  Patent Document 2 also discloses a case where the storage battery is replaced with an electric double layer capacitor.

JP-A-5-328508 Japanese Patent Laid-Open No. 2005-94862

  The means for controlling charging / discharging of the storage battery disclosed in Patent Document 2 is a step-down circuit that eliminates the fact that the voltage ratio between the rated voltage of the induction power receiving circuit and the rated voltage of the storage battery is far apart (the charging circuit) And the booster circuit need to be provided separately, so that the circuit configuration becomes complicated and the cost increases. A booster circuit usually requires a high-frequency transformer, inductor, and DC choke. These high-frequency transformer, inductor, and DC choke are large in size and unsuitable for installation of a moving body. It was difficult to secure such a space.

  In addition, the storage battery disclosed in Patent Document 1 is a storage battery group including a plurality of storage batteries connected in series because the voltage ratio between the rated voltage of the induction power reception circuit and the rated voltage of the storage battery is greatly different. Understood. The storage battery disclosed in Patent Document 2 is also understood to be a storage battery group in which four storage batteries having a rated voltage of DC 12 V are connected in series.

  Currently, many maintenance-free electric double layer capacitors are used instead of storage batteries. This electric double layer capacitor has a low rated voltage of about 3 V per cell. In the configurations of Patent Document 1 and Patent Document 2, a plurality of electric double layer capacitors are connected in series for use. When a plurality of electric double layer capacitors are connected in series as described above, the voltage of each electric double layer capacitor varies after discharge due to variations in the discharge characteristics of each electric double layer capacitor. Since charging cannot be performed as rated, resistors are connected in parallel to the electric double layer capacitors to form a uniform discharge circuit, thereby eliminating voltage variations in the electric double layer capacitors after discharge. Such a uniform discharge circuit should not be used in order to consume power, and an electric double layer capacitor having a low rated voltage is preferably used with as few serial numbers as possible.

  Therefore, the present invention provides an inductive power receiving circuit that can be provided at low cost with a simple circuit configuration, can be charged / discharged at a low voltage for charging an electric double layer capacitor connected in parallel, and can realize space saving. It is aimed at.

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is wound around a ferrite core, which is arranged opposite to an induction line through which a high-frequency current flows and in which an electromotive force is induced from the induction line. Power receiving coil, and a resonant capacitor that forms a resonant circuit that resonates with the frequency of the induction line together with the power receiving coil, and rectifies an alternating current output from the resonant circuit by a rectifier circuit, thereby varying power consumption. An inductive power receiving circuit for supplying power to a load,
A battery or an electric double layer capacitor; and a charge / discharge circuit that is electromagnetically coupled to the resonance circuit and charges / discharges the battery or the electric double layer capacitor. The charge / discharge circuit resonates the resonance circuit during a discharge operation. It is used as an element, and is fed to the resonance circuit from the battery or the electric double layer capacitor at the frequency of the induction line .
According to the above configuration, the charging / discharging circuit supplies power to the resonant circuit from the battery or the electric double layer capacitor at the frequency of the induction line using the resonant circuit as a resonant element during the discharging operation.
As described above, the battery or the electric double layer capacitor is not charged / discharged between the battery or the electric double layer capacitor and the DC circuit (a circuit formed between the rectifier and the load) as in the conventional case. And an AC circuit (resonant circuit) are charged and discharged, and at the time of discharge operation, the resonant circuit is used as a resonant element and power is supplied at the frequency of the induction line.

Moreover, invention of Claim 2 is invention of Claim 1, Comprising: One end is connected to the center tap of the coil with a center tap, and the center tap of the coil with a center tap, and the said charge or discharge circuit is the battery or A DC choke with the other end connected to the positive terminal of the electric double layer capacitor, one end connected to each end of the coil with the center tap, and the other end connected to the negative terminal of the battery or electric double layer capacitor, respectively. A first switch and a second switch, wherein the resonant circuit and the center-tapped coil are electromagnetically coupled with the resonant circuit as a high voltage and the center-tapped coil as a low voltage; The first switch and the second switch are alternately zeroed every 180 ° at the resonance frequency of the resonance circuit. Characterized in that it operates ON-OFF with pressure.
According to the above configuration, when the battery or the electric double layer capacitor is discharged by power supply, the power receiving coil (resonant circuit) electromagnetically coupled with the coil with the center tap is used as the high frequency transformer, and the resonance circuit is used as the resonance element. When a push-pull resonant converter is configured, and the first switch and the second switch are alternately turned on and off at zero voltage every 180 ° at the resonance frequency of the resonance circuit, an alternating current flows through the power receiving coil to the load. Power is supplied.

The invention according to claim 3 is the invention according to claim 2, wherein the charge / discharge circuit is wound around the ferrite core together with the power receiving coil, and is connected in parallel to the coil with the center tap. An auxiliary coil that electromagnetically couples a resonance circuit and a coil with a center tap; a winding ratio between the power receiving coil and the auxiliary coil; a voltage across the power receiving coil when the load is a rated load; and the battery or the electric double layer It is set based on the voltage ratio with the rated voltage of the capacitor.
According to the above configuration, the voltage induced in the auxiliary coil from the induction line (the voltage across the auxiliary coil) is alternately applied to the half of the center-tapped coil by the first switch and the second switch, so that 1 / Then, the AC component is smoothed by the DC choke, the battery or the electric double layer capacitor is charged, and the charging voltage of the electric double layer capacitor reaches a voltage half the voltage across the auxiliary coil. When it rises, charging stops. Further, when charging is stopped, the both-end voltage of the receiving coil and the both-end voltage of the auxiliary coil corresponding to the winding ratio are balanced.
The winding ratio of the power receiving coil to the auxiliary coil, that is, the number of turns N _{2 of the} auxiliary coil is the number N _{1 of the power} receiving coil wound around the ferrite core, the voltage V _SAC across the power receiving coil when the load is a rated load, From the rated voltage V _SDC of the multilayer capacitor, it is determined so as to satisfy the following formula.

V _SAC × (N ₂ / N ₁ ) × 1/2 (the above partial pressure) × 0.9 (coupling rate, etc.) = V _SDC
For example, physically limited, the number of turns _{N 1} 20 turns of the power receiving coil, the voltage across _{V SAC} receiving coil 320 V, the rated voltage _{V SDC} of the electric double layer capacitor when the 30 V, the number of turns _{N 2} of the auxiliary coil 4 turns are required.

  In addition, if the load exceeds the rated load and the power supplied from the induction line is insufficient or cannot be received from the induction line, and the voltage at both ends of the power receiving coil decreases, the voltage depending on the voltage at both ends of the power receiving coil and the turn ratio The voltage balance with the voltage at both ends of the auxiliary coil collapses and the voltage at both ends of the auxiliary coil increases, and in this state, the two switches are driven alternately in synchronism with the AC voltage of the induction line. The auxiliary coil voltage to which twice the voltage across the multilayer capacitor is applied causes an alternating current to flow through the receiving coil according to the action of the resonant capacitor and the winding ratio, that is, the battery or the electric double layer capacitor is discharged. Insufficient load power is replenished, and the voltage across the receiving coil increases. The discharge is stopped when the both-end voltage of the receiving coil and the both-end voltage of the auxiliary coil according to the winding ratio are balanced.

  Thus, depending on the load, charging and discharging are naturally repeated so that the voltage at both ends of the receiving coil and the voltage at both ends of the auxiliary coil according to the winding ratio are balanced, and when the load is below the rated load, Alternatively, the electric double layer capacitor is charged and discharged when the load exceeds the rated load or when power cannot be received from the induction line. Therefore, it is only necessary to supply electric power according to the rated load of the load to the induction line, and it is not necessary to cope with a load higher than the rated load, so that it is possible to suppress supply power and supply power to the induction line. Can be configured inexpensively.

The invention according to claim 4, an invention of claim 2, wherein the center tapped coil, the wound with the power receiving coil to the ferrite core, are the resonant circuit and the electromagnetic coupling, wherein The charging / discharging circuit includes a first diode having an anode connected to the other end of the DC choke , a cathode connected to the positive terminal of the battery or the electric double layer capacitor, and a third switch connected in parallel to the first diode. And a second diode having an anode connected to the other end of the first switch and the second switch and a cathode connected to the other end of the DC choke, and a detecting means for detecting a voltage across the output capacitor. , The winding ratio of the power receiving coil and the center tapped coil, the voltage across the power receiving coil when the load is a rated load, Set based on the voltage ratio with the rated voltage of the battery or electric double layer capacitor, and the voltage across the output capacitor detected by the detecting means is lower than the output voltage of the output capacitor when the load is rated load The third switch is turned on when the voltage is lower than the first set voltage.

  According to the above configuration, the voltage induced at the center-tapped coil from the induction line (the voltage across the center-tapped coil) is turned on and off alternately by the first switch and the second switch. At the tap, the voltage is divided by half, and then the AC component is smoothed by the DC choke. The battery or the electric double layer capacitor is charged through the first diode, and the charging voltage of the electric double layer capacitor is changed to the first diode. The charging is stopped when the voltage obtained by multiplying ½ of the voltage across the center-tapped coil by √2 is obtained by the above action. Further, when charging is finished, the both-end voltage of the power receiving coil is balanced with the both-end voltage of the auxiliary coil corresponding to the winding ratio.

  Also, when the load exceeds the rated load, the power that can be supplied from the induction line is insufficient, or the power cannot be received from the induction line, and the voltage across the output capacitor becomes equal to or lower than the first set voltage, the third switch is turned on. The first switch and the second switch are alternately turned on and off at zero voltage every 180 ° in synchronization with the AC voltage of the induction line. Then, a voltage twice the voltage across the battery or the electric double layer capacitor is applied to the coil with the center tap, and an alternating current is applied to the power receiving coil according to the action of the resonance capacitor and the winding ratio of the power receiving coil and the center tap coil. In other words, the battery or the electric double layer capacitor is discharged, the insufficient load power is replenished, and the voltage across the output capacitor is restored. Note that the voltage applied to the center-tapped coil during discharge is √2 times that of the voltage at both ends of the receiving coil, so that even if the degree of coupling between the receiving coil and the center-tapped coil is low In addition, power can be supplied from a battery or an electric double layer capacitor. When the voltage across the output capacitor returns to the first set voltage, the third switch is turned off and the discharge is stopped.

The invention according to claim 5 is the invention according to claim 3 or claim 4 , further comprising a saturable reactor connected in parallel to the resonant circuit, wherein the saturation voltage of the saturable reactor is set to the load. Is set based on the voltage of the resonance circuit when the load is rated load.

  According to the above configuration, when the load voltage increases, the load voltage is maintained at a constant voltage by the saturable reactor, and an increase in the voltage of the resonance circuit is suppressed. Therefore, it is avoided that the current flowing through the power receiving coil and the resonance capacitor is increased due to the voltage increase, and the power supplied from the induction line (power determined by the voltage and current of the power receiving coil) is limited. As a result, it is avoided that other moving bodies are not fed from the induction line.

The invention according to claim 6 is the invention according to claim 4 , wherein a voltage across the output capacitor detected by the detecting means is equal to or higher than a second set voltage higher than a rated output voltage of the output capacitor. Then, when both the first switch and the second switch are turned ON, and the voltage across the output capacitor returns to a substantially second set voltage, the first switch and the second switch are synchronized with the AC voltage of the induction line. In other words, the ON / OFF operation is alternately performed with a zero voltage every 180 °.

  According to the above configuration, when the voltage across the output capacitor is equal to or higher than the second set voltage and both the first switch and the second switch are turned on, both ends of the center-tapped coil are connected to form a closed loop, The voltage across the coil becomes zero and power is not supplied to the output capacitor. Then, the voltage across the output capacitor decreases, and when the voltage across the output capacitor returns to the second set voltage, the switch is returned to the normal switching operation, supplied to the output capacitor, and applied to the coil with the center tap. The voltage is damping (overshoot) at the rise of the resonance voltage, and the battery or the electric double layer capacitor is charged at a voltage higher than the normal applied voltage. Therefore, the voltage applied to the coil with the center tap at the time of discharge becomes a voltage higher than the normal voltage √2 times, and even when the coupling degree between the coil with the center tap and the receiving coil is low, the battery or the electric Current can be supplied from the multilayer capacitor.

The invention according to claim 7 is the invention according to claim 6 , wherein in addition to the first detection means for detecting the voltage across the output capacitor, the voltage across the battery or the electric double layer capacitor is detected. A battery or electric double layer voltage across the battery or the electric double layer capacitor detected by the second detection means is determined as an execution condition for turning on both the first switch and the second switch. When the voltage is equal to or higher than the rated voltage of the capacitor, the voltage across the output capacitor detected by the first detection means is equal to or higher than the second set voltage, and the voltage across the battery or electric double layer capacitor detected by the second detection means Is less than the rated voltage, the voltage across the output capacitor detected by the first detecting means is the first voltage. It is characterized in that it has a higher than the set voltage third predetermined voltage or more.

  According to the above configuration, when the both-end voltage of the battery or the electric double layer capacitor is equal to or higher than the rated voltage, when the both-end voltage of the output capacitor reaches the second set voltage, both the first switch and the second switch are turned on. If less, the first switch and the second switch are alternately turned on and off, and charging is performed.

  Further, when the voltage across the battery or the electric double layer capacitor is less than the rated voltage, when the voltage across the output capacitor reaches the third set voltage higher than the second set voltage, both the first switch and the second switch are turned on. When the voltage is less than 3 set voltages, the first switch and the second switch are alternately turned on and off, and when the voltage is less than the second set voltage and the first switch and the second switch are alternately turned on and off. A relatively high voltage is applied to the center-tapped coil, and the battery or electric double layer capacitor is rapidly charged.

The invention according to claim 8 is the invention according to any one of claims 4 to 7 , wherein the ferrite core is formed in an H shape in a cross-sectional view, The power receiving coil and the coil with the center tap are wound, and the coil of the DC choke is wound around one end portion with the number of turns distributed across the central portion.

  According to the above configuration, the number of turns of the DC choke coil with the central portion sandwiched between one end of the ferrite core cancels the magnetic fluxes generated by the high-frequency current flowing in the induction line in the ferrite core. On the other hand, since it is not affected by the magnetic flux, the core member of the DC choke can be replaced with a ferrite core, and an installation space for the DC choke becomes unnecessary.

The invention according to claim 9 is the invention according to any one of claims 3 to 8 , wherein the coil of the DC choke has an AC magnetic flux generated by a high-frequency current flowing in the induction line. It is characterized by being wound around the ferrite core so as to cancel the influence.

  According to the above configuration, the DC choke coil is not affected by the AC magnetic flux by being wound around the ferrite core so as to cancel the influence of the AC magnetic flux generated by the high-frequency current flowing in the induction line. The core member of the DC choke can be replaced with a ferrite core, and an installation space for the DC choke is not required.

The invention according to claim 10 is the invention according to claim 9 , wherein the coil of the DC choke is wound at a place other than the portion of the ferrite core around which the power receiving coil is wound. It is what.

  In the ferrite core portion around which the power receiving coil is wound, the AC magnetic flux generated by the high-frequency current flowing in the induction line is concentrated on the ferrite core so that the DC choke coil is not affected by the AC magnetic flux. It is difficult to wind it around.

  According to the above configuration, the DC choke coil is wound around a portion other than the portion of the ferrite core around which the power receiving coil is wound.

The inductive power receiving circuit of the present invention does not perform charging / discharging between a battery or an electric double layer capacitor and a DC circuit (a circuit configured between a rectifier and a load) as in the prior art. Charging and discharging is performed between the electric double layer capacitor and the AC circuit (resonance circuit), and an auxiliary coil or a coil with a center tap is wound around the ferrite around which the power receiving coil is wound, so that it can be used as a high frequency transformer. This eliminates the need for a high-frequency transformer required for a conventional DC / DC converter, and can provide a low-voltage charge / discharge circuit that can charge and discharge an electric double layer capacitor connected in parallel at a low cost, and can also save space. In addition, if the load exceeds the rated load, the battery or electric double layer capacitor is discharged and the insufficient power is compensated. This eliminates the need for the induction line to handle a load higher than the rated load, so that the power supply can be suppressed, and the power supply device that supplies power to the induction line can be configured inexpensively. ing.

It is a running route figure of the article conveyance equipment provided with the induction power receiving circuit in Embodiment 1 of the present invention. It is a principal part block diagram of the goods conveyance equipment. It is a figure of the pick-up unit used for the induction | guidance | derivation receiving circuit of the goods conveyance equipment, (a) is sectional drawing, (b) is a perspective view. It is a circuit diagram of the induction | power receiving circuit of the goods conveyance equipment. It is a figure of the pick-up unit used for the induction | guidance | derivation receiving circuit of the goods conveyance equipment in Embodiment 2 of this invention, (a) is sectional drawing, (b) is a perspective view. It is a circuit diagram of the induction | power receiving circuit of the goods conveyance equipment. It is a flowchart explaining operation | movement of the control apparatus of the induction | guidance | derivation receiving circuit of the goods conveyance equipment.

Hereinafter, an induction power receiving circuit according to an embodiment of the present invention will be described with reference to the drawings.
[Embodiment 1]
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 Embodiment 1 of the present invention, and FIG. 2 is a configuration diagram of the main part of the article conveying facility.

  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.

  Also, a plurality of upper and lower guide lines 17 along the traveling direction are provided on the outer side surface of the traveling rail 11 with a gap 19 (for example, a location where it is difficult to lay a curved portion or the like of the traveling rail 11) 19 in a plurality of spaces. 4 (in the figure) are laid, and a high frequency current (alternating current) having a predetermined frequency (for example, 10 kHz) is supplied to each induction line 17 by a power supply device 18.

  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 wheel devices 24 that support the rail 11 and that can follow the curved shape of the traveling rail 11 and that are movable (slidable) with respect to the swiveling driven wheel device 23, and these An optical transmission device used for signal exchange between a traveling motor (an example of a load whose power consumption fluctuates) 25 connected to one of the turning / sliding wheel devices 24 and a station 15 It is equipped with a 26A. The carriage 13 is driven by the driving motor 25.

Each station 15 is provided with an optical transmission device 26B that exchanges signals with the optical transmission device 26A of the carriage 13.
In addition, a pick-up unit 28 for supplying an electric power to the traveling motor 25 and the like is installed on each of the transport carriages 13 on the outside of the one of the swivel driven wheel devices 23 by the induction line 17. An induction power receiving circuit 29 (FIG. 4) is installed.

  As shown in FIG. 3, the pick-up unit 28 is screwed to a mounting plate 39 made of an aluminum plate at a predetermined interval, and a plurality of (two in the figure) E-shaped ferrite ( A ferrite core) 30 and a Litz wire that is wound around a central convex portion 30a of the ferrite 30 having an E-shaped cross section and placed in an alternating magnetic field having a constant frequency of about 10 KHz to generate an induced electromotive force. The receiving coil 31 and the auxiliary coil 32 made of a copper wire wound over the bottom of the central convex portion 30a are adjusted so that the guide line 17 is positioned at the center of both concave portions 30b. 39 is fixed to the transport carriage 13.

  Since the ferrite 30 is arranged at an interval in this manner, heat dissipation is facilitated, the temperature is lowered, and a large end effect is obtained. Therefore, a high electromotive force is generated in the power receiving coil 31 and the auxiliary coil 32. Induced, efficiency is improved and high power is obtained.

  As shown in FIG. 4, the induction power reception circuit 29 includes the power reception coil 31 and a resonance capacitor 33 that is connected in parallel to the power reception coil 31 and forms a parallel resonance circuit that resonates with the power reception coil 31 at the frequency of the induction line 17. The saturable reactor 34 connected in parallel to the resonant capacitor 33, the (full wave) rectifier circuit 35 connected in parallel to the saturable reactor 34, and one end connected to the positive output terminal of the rectifier circuit 35. A DC choke 36 and an output capacitor 37 connected between the other end of the DC choke 36 and the negative output end of the rectifier circuit 35 are provided, and the traveling motor 25 is driven as a load at both ends of the output capacitor 37. An inverter 38 is connected. The saturation voltage of the saturable reactor 34 is set to the voltage of the parallel resonant circuit (the voltage on the input side of the rectifier 35) corresponding to the voltage when the load is a rated load (the voltage of the output capacitor 37).

Further, the induction power receiving circuit 29 includes the auxiliary coil 32, a coil 40 with a center tap connected to both ends of the auxiliary coil 32, a DC choke 41 having one end connected to the center tap 40A of the coil 40 with the center tap, One end is connected to both ends of the tapped coil 40, and two first transistors composed of switching transistors (Tr) are alternately turned on and off at zero voltage every 180 ° in synchronization with the AC voltage of the induction line 17. A plurality of electric double layer capacitors (EDLC) 44 connected in parallel are provided between the switch 42 and the second switch 43, and the other end of the DC choke 41 and the other end of the two switches 42, 43. Depending on the components, when the electric double layer capacitor 44 is powered and discharged, the pickup unit 28 is Use as a wave transformer is constituted further receiving coil 31 and resonant capacitor 33 push-pull resonant converter with a resonant element. The rated voltage V _SDC of the electric double layer capacitor 44 is a low voltage, for example, DC 30V.

The turns ratio of the power receiving coil 31 and the auxiliary coil 32, i.e. the number of turns N ₂ of the auxiliary coil, number of turns N ₁ of the power receiving coil 31 wound on the ferrite _30, the voltage across V _SAC of the receiving coil 31 when the load is rated load From the rated voltage V _SDC of the electric double layer capacitor 44, the following equation is obtained.

V _SAC × (N ₂ / N ₁ ) × 1/2 (the above partial pressure) × 0.9 (coupling rate, etc.) = V _SDC
For example, physically limited, the number of turns _{N 1} 20 turns on the receiving coil 31, 320 V voltage across _{V SAC} of the receiving coil 31, when the rated voltage _{V SDC} of the electric double layer capacitor 44 to 30 V, the auxiliary coil 32 as the number of turns _{N 2,} about four turns is required. Setting the number of turns _{N 2} of the auxiliary coil 32 in four turns,
V _SAC × (N ₂ / N ₁ ) × 1/2 (described later) × 0.9 (coupling rate, etc.) ≈29 V
And the electric double layer capacitor 44 is charged by applying a maximum of about 29V.

Hereinafter, the operation in the first embodiment will be described.
The transport carriage 13 feeds power to the inverter 38 by the induction power receiving circuit 29, controls the inverter 38 to drive the traveling motor 25 to drive the turning / sliding wheel device 24, travels on the traveling rail 11, and moves to the station. After moving between 15 and arriving at the station 15, the transport carriage 13 exchanges the transfer information of the article R with the station 15 side via the optical transmission devices 26 </ b> A and 26 </ b> B, and moves the transfer / loading conveyor device 22. The station 15 drives the transfer conveyor device 16 to transfer the article R.

The operation of the induction power receiving circuit 29 is as follows.
An induced electromotive force is generated in the receiving coil 31 by the magnetic flux generated in the induction line 17, and a constant alternating current from the parallel resonance circuit formed by the receiving coil 31 and the resonance capacitor 33 is passed through the rectifier circuit 35 through the inverter 38. Power is supplied to a load composed of the traveling motor 25. At this time, since the current output from the parallel resonant circuit is a constant current, the voltage across the parallel resonant circuit is determined by the load power of the load, but when the load power increases, The current flowing through the resonant capacitor 33 increases. This current is supplied from the induction line 17 in a non-contact manner.

Further, when the load decreases and the output voltage of the output capacitor 37 increases, the voltage is maintained at a constant voltage by the saturable reactor 34, and an increase in the voltage of the parallel resonance circuit is suppressed. Therefore, it is avoided that the current flowing through the receiving coil 31 and the resonance capacitor 33 increases due to this voltage rise, and the power supplied from the induction line 17 (power determined by the voltage and current of the receiving coil 31) is limited. The Thereby, it is avoided that the other conveyance cart (moving body) 13 is not supplied with power from the guide line 17.
[Charging of electric double layer capacitor 44]
The electric double layer capacitor 44 is charged as follows.

The voltage induced in the auxiliary coil 32 from the induction line 17 (the voltage across the auxiliary coil 32) is alternately applied to half of the center-tapped coil 40 by the ON / OFF operation of the switches 42 and 43, and thus the auxiliary coil. A voltage that is ½ of the voltage across both ends of 32 is output, and then the AC component is smoothed by the DC choke 41, and the electric double layer capacitor 44 is charged. When the charging voltage of the electric double layer capacitor 44 rises to half the voltage across the auxiliary coil 32, the charging is stopped. In the state where the charging is stopped, the both-end voltage of the receiving coil 31 and the both-end voltage of the auxiliary coil 32 corresponding to the winding ratio are balanced, and the both-end voltage of the receiving coil 31 is the output voltage of the output capacitor 37 corresponding to the load. Is in balance.
[Discharging of Electric Double Layer Capacitor 44]
The electric double layer capacitor 44 is discharged as follows.

  When the load exceeds the rated load, or when the carriage 13 enters the gap 19 and power is not supplied from the induction line 17, the output voltage of the output capacitor 37 is reduced, and the voltage across the power receiving coil 31 is reduced. The voltage balance between the both-ends voltage of the receiving coil 31 and the both-ends voltage of the auxiliary coil 32 corresponding to the winding ratio is lost, and the both-ends voltage of the auxiliary coil 32 (the voltage that is twice the voltage across the electric double layer capacitor 44) increases. . Then, the electric double layer capacitor 44 is discharged and the insufficient power is supplemented by the electric power discharged from the electric double layer capacitor 44, and the output voltage of the output capacitor 37 is recovered.

  That is, the switches 42 and 43 are alternately turned ON / OFF at a zero voltage every 180 ° in synchronization with the AC voltage of the induction line 17, that is, alternately driven according to the resonance frequency of the parallel resonance circuit, and the power receiving coil 31. Depending on the action of the resonance capacitor 33 and the winding ratio of the power receiving coil 31 and the auxiliary coil 32, an alternating current flows through the power receiving coil 31, and the load power that is insufficient is supplemented. Then, the voltage across the power receiving coil 31 rises, and the discharge is stopped when the voltage of the auxiliary coil 32 according to the winding ratio is balanced.

  Thus, when the load is less than or equal to the rated load, charging and discharging are naturally repeated so that the both-end voltage of the power receiving coil 31 and the both-end voltage of the auxiliary coil 32 corresponding to the winding ratio are balanced according to the load. The electric double layer capacitor 44 is charged and discharged when the load exceeds the rated load or when power cannot be received from the induction line 17.

  In addition, the load exceeding the rated load can be handled in the induction power receiving circuit 29 by the discharge from the electric double layer capacitor 44, so that the induction line 17 does not need to deal with a load higher than the rated load. The rated power of 18 can be reduced.

  As described above, according to the first embodiment, the auxiliary coil 32 is wound around the ferrite 30 around which the power receiving coil 31 is wound and used as a high frequency transformer, and the power receiving coil 31 and the resonant capacitor 33 are used as a push-pull resonance element. By using it, the electric double layer capacitors 44 arranged in parallel can be charged and discharged at a low voltage with a simple circuit configuration, and a charge / discharge circuit can be provided at low cost. Further, since a high-frequency transformer required for the conventional DC / DC converter is not required, space saving can be realized.

  Further, when a current is passed through the induction line 17, charging / discharging of the electric double layer capacitor 44 is performed by balancing the voltage between both ends of the receiving coil 31 and the voltage between both ends of the auxiliary coil 32 according to the winding ratio. Control for discharging can be eliminated.

  Further, when the load exceeds the rated load or when the carriage 13 enters the gap 19 and is not supplied with power from the induction line 17, the electric double layer capacitor 44 is discharged and the insufficient power is compensated, whereby the induction line is compensated. 17 does not need to cope with a load higher than the rated load, so that the supplied power can be suppressed, and the power supply device 18 that supplies power to the induction line 17 can be constructed at a low cost. In addition, since the longer supply line 17 can be fed with the same power supply, the number of power supply devices 18 can be reduced.

Further, when the load decreases and the output voltage of the output capacitor 37 increases, the voltage is maintained at a constant voltage by the saturable reactor 34, the increase in the voltage of the resonance circuit is suppressed, and the electric power (receiving coil) supplied from the induction line 17 is suppressed. (Power determined by the voltage / current of 31) is restricted, so that it is possible to prevent the other transport carriage (moving body) 13 from being fed from the induction line 17.
[Embodiment 2]
FIG. 5 is a cross-sectional view, a perspective view showing a pickup unit used in the induction power reception circuit according to Embodiment 2 of the present invention, and FIG. 6 is a circuit diagram of the induction power reception circuit. In addition, the same code | symbol is attached | subjected to the same structure as Embodiment 1, and description is abbreviate | omitted.

Each conveyance carriage 13 is provided with a pickup unit 48 shown in FIG. 5 and an induction power receiving circuit 51 shown in FIG.
As shown in FIG. 6, the pickup unit 48 in the second embodiment has a plurality of (three in the figure) cross-sectional shapes that are screwed to a mounting plate 57 made of an aluminum plate at a predetermined interval. Ferrite (ferrite core) 50 and the cross-sectional shape of the H-shaped ferrite 50 are wound around a central portion 50a and placed in an alternating magnetic field having a constant frequency of about 10 KHz to generate an induced electromotive force. The number of turns of the power receiving coil 31 made of wire, the coil 52 with a center tap made of copper wire wound so as to sandwich the power receiving coil 31 across the central portion 50a, and the upper portion 50b of the ferrite 50 sandwiching the central portion 50a. It is formed of a coil 53a of a DC choke 53 (details will be described later) that are distributed and wound so that the induction line 17 is positioned at the center of both concave portions 50c. Mounting plate 57 is secured to the transport carriage 13 adjusted to.

  Since the ferrite 50 is arranged at an interval in this manner, heat dissipation is facilitated, the temperature is lowered, and a large end effect is obtained. Therefore, the power receiving coil 31 and the center tapped coil 52 have a high rise. Power is induced, efficiency is improved, and large power is obtained.

Further, the coil 53a of the DC choke 53 is wound around the upper end portion 50b of the ferrite 50 with the number of turns distributed between the central portion 50a, so that the magnetic flux g _AC of the alternating magnetic field generated by the induction line 17 on the ferrite 50 is The core member of the DC choke 53 can be replaced with the ferrite 50 without canceling each other, and thus not affected by the magnetic flux g _AC of the _AC magnetic field, and the installation space for the DC choke 53 can be eliminated. The magnetic flux of the DC magnetic field generated in the DC choke 53 (core member) is indicated by g _DC .

The coil 53a of the DC choke 53 is wound around the upper part 50b of the central ferrite 50 among the three H-shaped ferrites 50, but may be wound around the upper part 50b of one of the left and right ferrites 50. Further, it may be wound not only on the upper part 50b but also on the lower part 50d of the ferrite 50. That is, the coil 53a of the DC choke 53 is caused by the high-frequency current flowing in the induction line 17 at a place other than the central portion 50a of the ferrite 50 where the power receiving coil 31 and the center-tapped coil 52 are wound and the magnetic flux g _{AC of the AC} magnetic field is concentrated. What is necessary is just to be wound around the ferrite 50 so as to cancel the influence of the magnetic flux g _AC of the alternating magnetic field to be generated. The central portion 50a, by the magnetic flux g _AC of the AC magnetic field generated by the high frequency current flowing through the induction line 17 is concentrated winding a coil 53a of the DC choke 53 so as not to be affected by this magnetic flux g _AC Is difficult to avoid winding around the central portion 50a.

  As shown in FIG. 6, the induction power receiving circuit 51 includes the power receiving coil 31, a resonant capacitor 33, a rectifier circuit 35, a DC choke 36, and an output capacitor 37. An inverter 38 for driving the traveling motor 25 is connected.

Further, the induction power receiving circuit 51 includes the coil 52 with the center tap, the DC choke 53 having one end connected to the center tap 52A of the coil 52 with the center tap, the first switch 42 and the second switch 43, and the DC choke. 53, a first diode 54 having an anode connected thereto, and a plurality of electric double layer capacitors (EDLC) connected in parallel between the cathode of the first diode 54 and the other ends of the two switches 42 and 43. ) 44, the third switch 55 composed of a switching transistor (Tr) connected in parallel to the first diode 54, and the anodes connected to the other ends of the first switch 42 and the second switch 43. A second diode 56 having a cathode connected to the other end and a voltage V _SDC across the output capacitor 37 And a control device 60 that controls and drives the first switch 42, the second switch 43, and the third switch 55, which also serves as first detection means and second detection means for detecting the voltage V _EDC across the electric double layer capacitor 44 (details) Is provided below.

The winding ratio between the power receiving coil 31 and the center tapped coil 52, that is, the number of turns of the center tapped coil 52, is the number of turns of the power receiving coil 31 wound around the ferrite 50 as in the auxiliary coil 32 of the first embodiment. N ₁ , the voltage V _SAC across the receiving coil 31 when the load is a rated load, and the rated voltage V _SDC across the electric double layer capacitor 44, that is, the voltage V _SAC across the receiving coil 31 and the rated voltage V across the electric double layer capacitor 44 It is set based on the ratio with _SDC .

The control device 60 uses the voltage V _SDC at both ends of the output capacitor 37 when the load is a rated load as the rated output voltage V _K (for example, DC 250 v), and the voltage V _SDC at both ends of the output capacitor 37 as the rated output voltage V _A first upper limit value (an example of the second set voltage) V _KH (= V _K + α) and a first lower limit value V _KL (= V _K −α) are set as the voltage setting range to be maintained at _K , and the first lower limit value A discharge start set value (an example of a first set voltage; for example, DC 230 v) V _{DIS that} is lower than the value V _KL and cannot maintain the rated output voltage V _K and needs to be supplemented with electric power from the electric double layer capacitor 44 is set. This discharge start set value V _DIS matches the minimum allowable voltage at which the inverter 38 can be used. Α represents a voltage value for providing a dead zone.

Further, the control device 60 uses the maximum allowable voltage at which the inverter (an example of a load) 38 can be used as V _M (> V _K + α; for example, DC 330 v), and the voltage V _SDC across the output capacitor 37 is used as the maximum allowable voltage. the second upper limit value as the voltage setting range to maintain the V _M (first example of a third predetermined _{voltage) V} MH (= V _M) and the second lower limit value _V ML _{(= V} M _-2α) is set. The second upper limit value (an example of a third set voltage) _VMH is a voltage higher than the first upper limit value (an example of a second set voltage) _VKH .

The operation of the control device 60 will be described with reference to the flowchart of FIG.
When the third switch 55 is in an OFF state, the switches 42 and 43 are alternately turned on and off at a zero voltage every 180 ° in synchronization with the AC voltage of the induction line 17 (step -1). It is confirmed whether or not the both-end voltage V _SDC is equal to or lower than the discharge start set value V _DIS (step-2). The ON operation of the third switch 55 is controlled in pulse width while feeding back the voltage V _SDC across the output capacitor 37.

In step-2, when it is confirmed that the voltage V _SDC across the output capacitor 37 is higher than the discharge start set value V _DIS , the third switch 55 is turned off (completely turned off), and the electric double layer capacitor 44 is charged. (Step-4).

Then, the voltage across _{V EDC} of the electric double layer capacitor 44 to determine whether or rated voltage _{V P} (when it is not higher) (Step -5), when less than the upper limit of the voltage across _{V SDC} of the output capacitor 37 The voltage V _{H is set} to the second upper limit value V _MH , the lower limit voltage _VL is set to the second lower limit value V _ML (step −6), and when the rated voltage _VP is reached (when it becomes above), the upper limit voltage V _H is set to the second upper limit value V _MH . 1 upper limit _{V KH,} the lower limit voltage _{V L} is set to the first lower limit value _{V KL} (step -7).

Next, it is confirmed whether or not the voltage V _SDC across the output capacitor 37 is equal to or higher than the upper limit voltage V _H (step -8). If confirmed, both the switches 42 and 43 are turned on to cut off the power supply (step -9). Subsequently, it is confirmed whether or not the voltage V _SDC across the output capacitor 37 is equal to or lower than the lower limit voltage _VL (step -10). In step -8 voltage across _{V SDC} output capacitor 37 returns to step -1 if less than the upper limit voltage _{V H,} operated ON-OFF switch 42 and 43 alternately.

Hereinafter, the operation in the second embodiment will be described.
The transport carriage 13 feeds power to the inverter 38 by the induction power receiving circuit 51, controls the inverter 38 to drive the traveling motor 25 to drive the turning / sliding wheel device 24, travels on the traveling rail 11, and runs on the station. After moving between 15 and arriving at the station 15, the transport carriage 13 exchanges the transfer information of the article R with the station 15 side via the optical transmission devices 26 </ b> A and 26 </ b> B, and moves the transfer / loading conveyor device 22. The station 15 drives the transfer conveyor device 16 to transfer the article R.

The operation of the induction power receiving circuit 29 is as follows.
An induced electromotive force is generated in the power receiving coil 31 by the magnetic flux generated in the induction line 17, and a constant current from the parallel resonant circuit formed by the power receiving coil 31 and the resonant capacitor 33 travels with the inverter 38 via the rectifier circuit 35. Power is supplied to a load composed of the motor 25 for use. At this time, since the current output from the parallel resonance circuit is a constant current, the voltage across the parallel resonance circuit is determined by the load power of the load. However, when the load power increases, the receiving coil 31 and the resonance capacitor 33 are increased. The current that flows through becomes larger. Current is supplied from the induction line 17 in a non-contact manner.
[Charging of electric double layer capacitor 44]
The electric double layer capacitor 44 is charged as follows.

  The voltage induced in the center-tapped coil 52 from the induction line 17 is output to the DC choke 53 by ½ of the induced voltage of the center-tapped coil 40 by the ON / OFF operation of the switches 42 and 43. The DC choke 53 smoothes the AC component, and the electric double layer capacitor 44 is charged via the first diode 54. At this time, the first diode 54 is charged to the peak value of the input voltage of the first diode 54, and the electric double layer capacitor 44 is charged to a voltage that is √2 times the half voltage. When the charging voltage of the electric double layer capacitor 44 rises to a voltage that is √2 times the half voltage, charging is stopped. In the state where the charging is stopped, the both-ends voltage of the receiving coil 31 and the both-ends voltage of the center-tapped coil 52 corresponding to the winding ratio are balanced, and the both-ends voltage of the receiving coil 31 corresponds to the load of the output capacitor 37. The output voltage is balanced.

Although the details will be described later, when the voltage across _{V EDC} of the electric double layer capacitor 44 is equal to or higher than the rated voltage _{V P,} the voltage across _{V SDC} first upper limit value of the output capacitor 37 (e.g., 250V DC; the second set voltage Example) When V _KH is reached, both the switches 42 and 43 are turned on, and when it is less than the first upper limit value V _KH , the switches 42 and 43 are alternately turned on and off to perform charging.

Also when the voltage across _{V EDC} of the electric double layer capacitor 44 is less than the rated voltage _{V P,} the voltage across _{V SDC} of the output capacitor 37 and the second upper limit value (e.g., DC330v; an example of a third set _{voltage) V} MH (= V _M ), the switches 42 and 43 are both turned on. When the switch is below the second upper limit value V _MH , the switches 42 and 43 are alternately turned on and off. At this time, the switch is switched below the first upper limit value V _KH. A high voltage is applied to the center-tapped coil 52 as compared to when the 42 and 43 are alternately turned on and off, and the electric double layer capacitor 44 is rapidly charged and fully charged.
[Discharging of Electric Double Layer Capacitor 44]
The electric double layer capacitor 44 is discharged as follows.

If the load exceeds the rated load, or if the carriage 13 enters the gap 19 and power is not supplied from the induction line 17, the power that can be supplied from the induction line 17 is insufficient. _{When the SDC} decreases and becomes equal to or lower than the discharge start set value V _DIS , the third switch 55 is turned on (PWM control).

  Then, the switches 42 and 43 are alternately turned ON / OFF at a zero voltage every 180 ° in synchronism with the AC voltage of the induction line 17, that is, alternately driven according to the resonance frequency of the parallel resonance circuit. Depending on the action of the resonant capacitor 33 and the winding ratio of the power receiving coil 31 and the center-tapped coil 52, an alternating current flows through the power receiving coil 31, and the insufficient load power is replenished. At this time, the voltage across the electric double layer capacitor 44 is charged to a voltage of √2 times, and the voltage applied to the coil 52 with the center tap at the time of discharging is balanced with the voltage across the power receiving coil 31. Since √2 times, power can be supplied from the electric double layer capacitor 44 sufficiently even if the degree of coupling between the power receiving coil 31 and the center-tapped coil 52 is low.

Further, since the third switch 55 is PWM-controlled, the voltage V _SDC across the output capacitor 37 gradually increases. Further, when the third switch 55 is turned from ON to OFF by PWM control, the DC choke 53 causes a current to flow to the coil 52 with the center tap. At this time, the second diode 56 forms a closed loop.

When the output voltage V _SDC of the output capacitor 37 becomes higher than the discharge start set value V _DIS , the third switch 55 is turned off and the switches 42 and 43 are alternately turned on and off as described above to be charged. The
[Power cut]
When the load decreases and the output voltage V _SDC of the output capacitor 37 exceeds the upper limit voltage V _H , both the first switch 42 and the second switch 43 are turned on, and both ends of the center-tapped coil 52 are connected to form a closed loop. Thus, the voltage across the power receiving coil 51 becomes zero, and power is not supplied to the output capacitor 37 (power supply is cut). Since the third switch 55 is in the OFF state, the electric double layer capacitor 44 is not discharged. Then, the voltage across the output capacitor 37 decreases, and when the voltage across the output capacitor 37 falls below the lower limit voltage V _L , the normal switching operation, that is, the alternate ON-OFF operation of the switches 42 and 43 is restored. Power supply to 37 is resumed. At this time, the electric double layer capacitor 44 is charged with a voltage applied to the center-tapped coil 52 at a higher voltage than a normally induced voltage by damping (overshoot) of the rise of the resonance voltage. Therefore, the voltage applied to the center-tapped coil 52 at the time of discharge becomes a voltage that is higher than the normal √2 times voltage, and even if the degree of coupling between the center-tapped coil 52 and the power receiving coil 31 is lower, Insufficient power can be supplemented from the electric double layer capacitor 44.

Note that (if not higher) voltage across _{V EDC} of the electric double layer capacitor 44 when less than the rated voltage _{V P,} the upper limit voltage _{V H} and the second upper limit value _{V MH,} the lower limit voltage _{V L} and the second lower limit value _{V ML} is set to, reaches the rated voltage _{V P,} the upper limit voltage _{V H} to the first upper limit value _{V KH,} by the lower limit voltage _{V L} is set to the first lower limit value _{V KL,} the voltage across the electrical double layer capacitor 44 when V _EDC is less than the rated voltage _{V P,} the output voltage across _{V SDC} capacitor 37 is controlled to a maximum allowable voltage _{V M} of the inverter 38, when the above voltage across _{V SDC} of the output capacitor 37 rated output voltage _{V K} Controlled.

  As described above, according to the second embodiment, the coil 50 with the center tap is wound around the ferrite 50 around which the power receiving coil 31 is wound to be used as a high frequency transformer, and the power receiving coil 31 and the resonant capacitor are used as push-pull resonance elements. 33 can provide a charge / discharge circuit that can charge / discharge the electric double layer capacitor 44 arranged in parallel with a simple circuit configuration at a low voltage, and is also necessary for a conventional DC / DC converter. Space-saving can be realized by eliminating the need for a high-frequency transformer. Further, at the time of charging, charging is performed up to the peak voltage by the action of the first diode 54, so that charging is performed up to √2 times the voltage induced in the coil 52 with the center tap instead of 1/2.

Further, when the output voltage V _SDC of the output capacitor 37 becomes equal to or lower than the discharge start set value V _DIS , the third switch 55 is turned on to replenish the insufficient load power. At this time, the voltage across the electric double layer capacitor 44 is increased. Is charged to a voltage √2 times the above, so that a voltage √2 times the voltage induced by the induction line 17 is normally applied to the coil 52 with the center tap, and the receiving coil 31 and the coil with the center tap are applied. Even if the degree of coupling of 52 is low, the insufficient load power can be reliably replenished.

  Further, when the load exceeds the rated load or when the carriage 13 enters the gap 19 and is not supplied with power from the induction line 17, the electric double layer capacitor 44 is discharged and the insufficient power is compensated, whereby the induction line is compensated. 17 does not need to cope with a load higher than the rated load, so that the supplied power can be suppressed, and the power supply device 18 that supplies power to the induction line 17 can be constructed at a low cost. In addition, since the longer supply line 17 can be fed with the same power supply, the number of power supply devices 18 can be reduced.

  When the load decreases and the output voltage of the output capacitor 37 increases, both the first switch 42 and the second switch 43 are turned on, and the increase in the voltage of the parallel resonant circuit is suppressed, and the power ( By restricting the power determined by the voltage and current of the power receiving coil 31, it is possible to avoid that the other transport carriage (moving body) 13 is not fed from the induction line 17.

In the first and second embodiments, the electric double layer capacitor 44 is charged, but a battery may be used.
In the first embodiment, the DC choke 36 is provided separately from the pickup unit 28. However, as in the second embodiment, the coil of the DC choke 36 is replaced with an E-shaped ferrite (ferrite core) 30. To cancel the influence of the magnetic flux g _AC of the _AC magnetic field generated by the high frequency current flowing in the induction line 17 at a place other than the central convex portion 30a where the power receiving coil 31 and the auxiliary coil 32 are wound and the magnetic flux g _{AC of the AC} magnetic field is concentrated. It may be wound around. Thereby, the core member of the DC choke 36 can be substituted by the ferrite 30 without being affected by the magnetic flux g _AC of the AC magnetic field, and the installation space for the DC choke 36 can be made unnecessary.

  In the second embodiment, the two switches 42 and 43 are both turned on to suppress the rise in the voltage of the parallel resonance circuit when the load is reduced. However, the function is switched to both the two switches 42 and 43 being turned on. As in the first embodiment, a saturable reactor may be connected to both ends of the parallel resonant circuit.

DESCRIPTION OF SYMBOLS 17 Induction line 18 Power supply device 28 Pickup unit 29,51 Induction receiving circuit 30 Ferrite 30a Center convex part 30b Concave 31 Power receiving coil 32 Auxiliary coil 33 Resonant capacitor 34 Saturable reactor 35 Rectifier circuit 36 DC choke 37 Output capacitor 38 Inverter 40, 52 Coil with center tap 40A, 52A Center tap 41 DC choke 42 First switch 43 Second switch 44 Electric double layer capacitor 48 Pickup unit 50 Ferrite 50a Central part 50b Upper part 50c Recessed part 50d Lower part 53 DC choke 53a Coil 54 First diode 55 First 3 switch 56 2nd diode 60 controller

Claims (10)

A receiving coil wound around a ferrite core, which is arranged opposite to an induction line through which a high-frequency current flows and in which an electromotive force is induced from the induction line, and a resonance circuit that resonates with the frequency of the induction line together with the receiving coil An inductive power receiving circuit that rectifies an alternating current output from the resonant circuit by a rectifier circuit and supplies power to a load whose power consumption fluctuates,
Battery or electric double layer capacitor,
A charge / discharge circuit that is electromagnetically coupled to the resonance circuit and charges / discharges the battery or the electric double layer capacitor;
With
The charging / discharging circuit uses the resonant circuit as a resonant element and supplies power to the resonant circuit from the battery or an electric double layer capacitor at a frequency of the induction line during a discharging operation. Power receiving circuit. The charge / discharge circuit is
A coil with a center tap,
A DC choke having one end connected to the center tap of the coil with the center tap and the other end connected to the positive terminal of the battery or the electric double layer capacitor;
A first switch and a second switch each having one end connected to both ends of the coil with the center tap and each other connected to the negative terminal of the battery or the electric double layer capacitor
With
The resonant circuit and the center-tapped coil are electromagnetically coupled with the resonant circuit as a high voltage and the center-tapped coil as a low voltage,
The charge / discharge circuit performs ON-OFF operation of the first switch and the second switch alternately at a zero voltage every 180 ° at a resonance frequency of the resonance circuit. The inductive power receiving circuit described. The charge / discharge circuit is
Auxiliary coil wound around the ferrite core together with the power receiving coil, connected in parallel to the center tapped coil, and electromagnetically coupling the resonance circuit and the center tapped coil
With
The winding ratio between the power receiving coil and the auxiliary coil is set based on the voltage ratio between the voltage across the power receiving coil when the load is a rated load and the rated voltage of the battery or the electric double layer capacitor.
The inductive power receiving circuit according to claim 2 . The coil with the center tap is wound around the ferrite core together with the power receiving coil, and is electromagnetically coupled to the resonance circuit,
The charge / discharge circuit is
A first diode having an anode connected to the other end of the DC choke and a cathode connected to a positive terminal of the battery or the electric double layer capacitor;
A third switch connected in parallel to the first diode;
A second diode having an anode connected to the other end of the first switch and the second switch, and a cathode connected to the other end of the DC choke;
Detection means for detecting a voltage across the output capacitor;
With
A winding ratio between the power receiving coil and the center-tapped coil is set based on a voltage ratio between a voltage across the power receiving coil when the load is a rated load and a rated voltage of the battery or the electric double layer capacitor,
When the voltage across the output capacitor detected by the detecting means is equal to or lower than a first set voltage lower than the output voltage of the output capacitor when the load is a rated load, the third switch is turned on. The induction power receiving circuit according to claim 2 , wherein: A saturable reactor connected in parallel to the resonant circuit;
The induction power reception circuit according to claim 3 or 4 , wherein a saturation voltage of the saturable reactor is set based on a voltage of the resonance circuit when the load is a rated load . When the voltage across the output capacitor detected by the detection means is equal to or higher than a second set voltage higher than the rated output voltage of the output capacitor, both the first switch and the second switch are turned on, and both ends of the output capacitor When the voltage returns to approximately the second set voltage, the first switch and the second switch are alternately turned on and off at zero voltage every 180 ° in synchronization with the AC voltage of the induction line. The inductive power receiving circuit according to claim 4 , wherein In addition to the first detection means for detecting the voltage across the output capacitor, the second detection means for detecting the voltage across the battery or electric double layer capacitor,
Execution conditions for turning on both the first switch and the second switch are as follows:
When the voltage across the battery or electric double layer capacitor detected by the second detection means is equal to or higher than the rated voltage of the battery or electric double layer capacitor, the voltage across the output capacitor detected by the first detection means is Over the second set voltage,
When the voltage across the battery or electric double layer capacitor detected by the second detection means is less than the rated voltage, the voltage across the output capacitor detected by the first detection means is higher than the second set voltage. The induction power reception circuit according to claim 6 , wherein the induction power reception circuit is set to be equal to or higher than a third set voltage . The ferrite core is formed in an H shape in cross-section, and the power receiving coil and the center-tapped coil are wound around the central portion of the ferrite core, and the number of turns is distributed to one end portion with the central portion interposed therebetween. The induction power receiving circuit according to any one of claims 4 to 7, wherein the coil is wound . The DC choke coils claims 3 to 8, characterized in <br/> that are wound around the ferrite core so as to cancel the effect of the alternating magnetic flux generated by the high frequency current flowing through the induction line An induction power receiving circuit according to any one of the above. The coil of the DC choke is wound outside the ferrite core where the power receiving coil is wound.
The inductive power receiving circuit according to claim 9.

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