JP4134523B2 - Contactless power receiving device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit configuration of a power receiving apparatus that is supplied with power by non-contact power feeding. More specifically, the present invention relates to a configuration of a power receiving device in an unmanned transport system in which a plurality of transport vehicles are arranged on a track and power is supplied to the transport vehicles by non-contact power feeding.
[0002]
[Prior art]
Various technologies are disclosed in the configuration of a power receiving device that receives power with a pickup coil in a non-contact state from a power supply line.
This technology reduces noise by using a passive circuit for the regulator circuit that obtains a constant voltage to be applied to the motor from a constant current, and also prevents noise. The constant current is derived from the electric power induced in the pickup section. A constant voltage is applied to the motor of the transport vehicle by interposing an obtained pickup resonance circuit and an impedance conversion unit that converts a constant current output from the pickup resonance circuit unit into a constant voltage.
[0003]
As a specific configuration, the impedance conversion unit is configured by a T-type four-terminal circuit, the series element is configured by two inductors, and the parallel element is configured by a capacitor, and the corresponding one input terminal and output A common terminal, two inductors connected in series between the corresponding other input terminal and output terminal, and the capacitor connected between the connection point between both inductors and the common terminal It is.
In addition, the impedance conversion unit is composed of a T-type four-terminal circuit, the series element is composed of two capacitors, and the parallel element is composed of an inductor, and the corresponding one input terminal and output terminal are used as a common terminal, Two capacitors are connected in series between the corresponding other input terminal and output terminal, and an inductor is connected between the connection point between both capacitors and the common terminal.
[0004]
In addition to this, the impedance conversion unit is composed of a π-type four-terminal circuit, the series element is an inductor, and the parallel element is composed of two capacitors, and the corresponding one input terminal and output terminal are shared. The inductor is connected between the other corresponding input terminal and the output terminal, and the capacitors are connected between the connection end portions on both sides of the inductor and the common terminal.
The impedance converter is composed of a π-type four-terminal circuit, the series element is a capacitor, the parallel element is composed of two inductors, and the corresponding one input terminal and output terminal are common terminals, In the figure, the capacitor is connected between another corresponding input terminal and an output terminal, and the inductors are connected between connection terminals on both sides of the capacitor and the common terminal.
[0005]
[Problems to be solved by the invention]
However, in the above-described prior art, the power receiving circuit is still complicated, which causes a large base and a large transport device to which the base is attached.
Therefore, the inventor has arrived at the invention for the purpose of configuring a power receiving circuit that can extract a stable high voltage with a simpler configuration.
[0006]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
According to a first aspect of the present invention, the pickup includes a pickup coil, an impedance conversion unit including a passive element, and a rectifier circuit, and input terminals of the impedance conversion unit are respectively connected to both ends of the output of the pickup coil, and the impedance In the non-contact power receiving device in which the input ends of the rectifier circuit are respectively connected to both ends of the output of the conversion unit, and power is supplied in a non-contact manner from a power supply line to which power is supplied,
Said impedance conversion unit, to one input terminal of the impedance converter, and connecting a capacitor, connected either to the reactor output end of the capacitor, while the output end of the reactor output of the impedance converter connected to, and connecting the other of the other output terminal of the input terminal of the impedance converter, it connects the other output terminal of said capacitor,
The reactance of the pickup coil is L p , the capacitance of the capacitor is C, the reactance of the reactor is L, the angular velocity is ω, F p = 1−ω ² L p C, and F p = −L p / L It was made to satisfy .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a non-contact power feeding system according to an embodiment of the present invention will be described with reference to the drawings. The tracked cart system using the non-contact power supply method using the feeder line will be described.
[0010]
FIG. 1 is a diagram schematically showing a tracked bogie system in which electric power is supplied from a feeder line in a contactless manner.
In FIG. 1, a track 12 is laid on a moving path of a transport carriage 13 (shown by a broken line), and a power supply line 5 in which a conductive wire such as a copper wire is covered with an insulating material is disposed along the track 12. Yes.
A power supply device 16 is connected to the power supply line 5, and the power supply device 16 controls power supply and supply power.
The transport carriage 13 has a power receiving unit 9 for obtaining electric power from the power supply line 5, and is capable of reciprocating on the track 12 using electric power extracted by the power receiving unit 9.
[0011]
The track 12 is composed of a main route and a sub route, and the main route and the sub route are connected at the junction. A loading section 4 is provided in the vicinity of the sub route. The loading unit 4 loads a load on the transport vehicle 13 or unloads the load loaded on the transport vehicle.
The transport vehicle 13 moves through the main route, enters the sub route from the junction, and reaches the loading unit 4.
[0012]
The transport carriage 13 may be an overhead traveling vehicle or a floor traveling vehicle, and in this embodiment, an overhead traveling vehicle will be described.
FIG. 2 is a top front view of a transport vehicle showing a configuration when the tracked cart system is applied to an overhead traveling vehicle, and FIG. 3 is a top side view of the same.
[0013]
As shown in FIGS. 2 and 3, the power receiving unit 9, the drive wheel 14, and the guide wheel 17 are provided on the upper portion of the transport carriage 13. The drive wheels 14 are connected to the drive mechanism of the transport carriage 13, and the transport carriage 13 moves along the track 12 by driving the wheels 14.
A guide wheel 17 is in contact with the inside of the track 12, and a convex portion is provided on the lower surface of the rear center of the track 12, and the drive wheel 14 is in contact with the convex portion.
The guide wheel 17 and the drive wheel 14 are held by the upper frame 11, and the upper frame 11 is fixed to the upper surface of the connection frame 18.
[0014]
A power receiving unit 9 is disposed on the side surface of the connection frame 18. A transport unit 19 is attached to the lower surface of the connection frame 18. The transport vehicle 13 moves a track 12 by placing a load on the transport section.
The power receiving unit 9 is configured at a position close to the power supply line holder 30.
The feeder line holder 30 holds the feeder line 5 on the side of the carriage 13 of the feeder line holder 30. As a result, the power supply line holder 30 is brought close to the power receiving unit 9 and the power supplied from the power supply line 5 is efficiently received.
[0015]
In the unmanned transport system using contactless power feeding in this embodiment, a constant current is supplied from the power supply device 16 that is a primary circuit, and the transport vehicle 13 is a secondary provided in the transport vehicle 13. The power receiving unit 9 which is a circuit receives power from the feeder line 5 in a contactless manner.
The power supply device 16 that supplies power to the transport vehicle 13 combines a constant voltage power source that is generally used and an impedance conversion unit, so that the power supply line 5 has characteristics as close to a constant current as possible. A sine wave current is supplied.
[0016]
FIG. 4 is a front sectional view showing the configuration of the power receiving unit and the feeder line.
As shown in FIG. 4, the power receiving unit 9 is configured in an E shape when viewed from the front, and the front end of the central portion of the power receiving unit 9 is inserted between the feeder lines 5 and 5. A pickup coil 21 is attached to the tip of the central portion of the core constituting the power receiving unit 9. The coil 21 receives electric power from the magnetic field generated in the feeder line 5 using electromagnetic induction. is there.
The power receiving unit 9 has a configuration in which the power supply lines 5 and 5 are positioned one by one in a space formed by two concave portions formed between the upper and lower protrusions 22 and 22 and the central protrusion 23 therebetween. .
The core is a ferrite member having a substantially E-shaped cross section, and a pickup coil 21 is wound around the core.
The pickup coil 21 receives a magnetic field generated by flowing a high-frequency current through the feeder lines 5 and 5. And electric power is taken out from the induced voltage which generate | occur | produces in the pick-up coil 21 using an electromagnetic induction phenomenon. In this way, electric power is supplied from the power supply line 5 to the power receiving unit 9 in a non-contact manner, and the driving motor is driven or electric power is supplied to the control device.
The feeder line holder 30 holds the feeder line 5 in parallel and is disposed in the traveling direction of the transport carriage 13. Accordingly, the power receiving unit 9 of the transport carriage 13 is configured not to contact the power supply line holder 30.
[0017]
As shown in FIG. 4, the power supply line holder 30 includes a power supply line holding part 41, a base part 42, and a connection part 43.
The feed line holder 30 is configured in an approximately E shape, and the connecting portions 43 and 43 projecting in the direction perpendicular to the side of the base portion 42 are configured in parallel. A feeding line holding portion 41 is configured at the tip of the connecting portion 43.
The connecting portion 43 is inserted into the recessed space in accordance with the interval between the protruding portions 22, 23, and 22 of the power receiving unit 9.
The power supply line holding portion 41 is disposed on the back side (closed side) with respect to the power receiving unit 9 from the center of the recessed space of the power receiving unit 9 and holds the power supply lines 5 and 5.
[0018]
The feed line holding portion 41 is formed with a concave portion having an arc shape when viewed from the front, and the feed line 5 is held in the concave portion. An opening is formed on the side of the feeder holding part 41, and the feeder 5 is inserted into the feeder holding part 41 through the opening. In the feeder holding part 41, the opening part is provided in the direction opposite to the base part 42, and is provided in the extending direction of the connecting part 43.
Thereby, it is easy to secure a work space for inserting the power supply line 5, and the connecting portion 43 receives a force applied at the time of insertion, thereby facilitating the work of inserting the power supply line 5.
Further, the connecting portion 43 has a hollow structure, and a cavity is formed between the base portion 42 and the feeder line holding portion 41.
Thereby, while reducing the weight of the feeder holder 30, the strength is maintained.
[0019]
FIG. 5 is a circuit diagram showing the configuration of the power receiving unit mounted on the transport vehicle.
The power receiving unit 9 includes a resonance circuit 52 including the pickup coil 21, an impedance conversion circuit 53, and a rectification circuit 54. The rectifier circuit 54 is connected to a drive control mechanism 56 configured by a drive motor and a control circuit disposed in the transport vehicle 13.
The power reception unit 9 takes in electric power supplied at a high frequency from the feeder line 5 by the pickup coil 21 and amplifies the current by the resonance circuit 52. The amplified current is converted to a constant voltage by the impedance conversion circuit 53 and supplied to the drive unit and the control unit of the transport vehicle 13 via the rectification circuit 54.
[0020]
Next, the configuration before the rectifier circuit in the power receiving unit 9 will be described.
FIG. 6 is a diagram illustrating a configuration of a resonance circuit and an impedance conversion circuit in the power receiving unit.
The resonance circuit 52 is constituted by the pickup coil 21 and the resonance capacitor 61, and amplifies the current obtained by electromagnetic induction by the pickup coil 21 and makes it a constant current. Each constant is selected so that Fp = −Lp / L and Fp = 1−ω ² LpC (ω: angular velocity) where Lp is the inductance, C is the capacitance of the capacitor 61, and L is the inductance of the reactor 62. Thus, the output power from the resonance circuit 52 can be stably converted to a constant voltage with a very simple circuit.
[0021]
Next, the operation of the non-contact power receiving device according to the present invention will be described.
As described above, a substantially sine constant current is supplied from the power supply device 16 to the power supply line 5. Then, the pickup coil 21 of the power receiving unit 9 takes out current in a non-contact manner using electromagnetic induction, and amplifies it in the resonance circuit 52 and makes it constant current.
Then, the constant current is converted into a constant voltage by the impedance conversion circuit 53, rectified to direct current by the rectifier circuit 54, and then supplied to the drive control mechanism 56.
[0022]
Further, the configuration of a circuit that is a second embodiment of the power receiving unit 9 will be described.
FIG. 7 is a diagram showing a circuit configuration according to the second embodiment.
The circuit of the second embodiment includes a pickup coil 21, a resonance capacitor 61 for increasing the output from the pickup coil 21, a constant voltage conversion reactor 62, and a capacitor 63 for preventing overcurrent. Is.
The capacitor 61 is connected in parallel to the pickup coil 21, and a reactor 62 is connected in series to the capacitor 61. The capacitor 63 is connected in parallel with the reactor 62.
In the power receiving unit 9, by adding the capacitor 63, an overcurrent is prevented from flowing through the drive control mechanism 56 even if another transport vehicle 13 traveling on the power supply line 5 is removed from the power supply line 5 due to maintenance or the like. be able to.
[0023]
【The invention's effect】
According to a first aspect of the present invention, the pickup includes a pickup coil, an impedance conversion unit including a passive element, and a rectifier circuit, and input terminals of the impedance conversion unit are respectively connected to both ends of the output of the pickup coil, and the impedance In the non-contact power feeding device in which the input ends of the rectifier circuit are respectively connected to both ends of the output of the converter, and the power is supplied from the power supply line that is supplied with power, the impedance converter includes the impedance to one input terminal of the conversion unit, to connect the capacitor, connect one to reactor output end of the capacitor, connected to the output end of the reactor to the one output end of the impedance conversion portion, wherein the impedance conversion unit the other of connecting the other of the other output terminal of the input terminal, it outputs terminal of the capacitor Connect the reactance of the pickup coil L p, the capacitance of the capacitor C, the reactance of the reactor is L, the angular velocity omega, in ^{F p = 1-ω 2 L} p C, and, F p = -L Since p / L is satisfied , a high voltage can be stably extracted by a simple impedance conversion circuit including one capacitor and one reactor.
Further, the reactance of the pickup coil is L p , the capacitance of the capacitor is C, the reactance of the reactor is L, the angular velocity is ω, F p = 1−ω ² L p C, and F p = −L p Since / L is satisfied, a constant voltage proportional to L can be obtained as the output voltage.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a tracked bogie system in which electric power is supplied from a power supply line in a contactless manner.
FIG. 2 is an upper front view of a transport vehicle showing a configuration when the tracked cart system is applied to an overhead traveling vehicle.
FIG. 3 is an upper side view of the same.
FIG. 4 is a front sectional view showing a configuration of a power receiving unit and a feeder line.
FIG. 5 is a circuit diagram showing a configuration of a power receiving unit mounted on a transport vehicle.
FIG. 6 is a diagram illustrating a configuration of a resonance circuit and a rectifier circuit in the power receiving unit.
FIG. 7 is a diagram showing a circuit configuration according to a second embodiment.
[Explanation of symbols]
5 Feeder Line 9 Power Receiving Unit 30 Feeder Line Holder 51 Pickup Coil 52 Resonant Circuit 53 Constant Voltage Conversion Circuit 54 Rectifier Circuit 61 Capacitor 62 Reactor 63 Capacitor

Claims (1)

A pickup coil, an impedance conversion unit including a passive element, and a rectifier circuit, both ends of the output of the pickup coil are connected to input ends of the impedance conversion unit, and both ends of the output of the impedance conversion unit are In the power receiving device for contactless power feeding, in which the input terminals of the rectifier circuit are connected to each other, and the power is supplied from a power feeding line that is supplied with power.
Said impedance conversion unit, to one input terminal of the impedance converter, and connecting a capacitor, connected either to the reactor output end of the capacitor, while the output end of the reactor output of the impedance converter connected to, and connecting the other of the other output terminal of the input terminal of the impedance converter, it connects the other output terminal of said capacitor,
The reactance of the pickup coil is L p , the capacitance of the capacitor is C, the reactance of the reactor is L, the angular velocity is ω, F p = 1−ω ² L p C, and F p = −L p / L A non-contact power feeding device characterized by satisfying the above .

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