JP2002272021A - Non-contact feeder device to be mounted on transport vehicle for transporting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact feeder device, which is mounted on a transport vehicle for a transporting system, that is capable of autonomously and logically adjusting the current that flows in windings of a secondary pickup coil, according to the size of a load and is also capable of preventing overheating of the wirings with a light load. SOLUTION: A load and a resonance capacitor C2 are connected in series with both terminals 'a', 'b' of the secondary pickup coil mounted on the car, in the non-contact feeder device that is mounted on the vehicle for a transport system, in which by using a conductor connected to a power supply E as a primary side and by utilizing electromagnetic phenomenon, power is obtained from a current 11 flowing in the primary side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact power supply device mounted on a transport vehicle for a transport system, and more particularly, to an autonomous and independent current source that flows through a winding of a secondary pickup coil according to the magnitude of a load. The present invention relates to a non-contact power supply device mounted on a transport vehicle for a transport system, which can be rationally adjusted and prevents overheating of a winding under a light load.

[0002]

2. Description of the Related Art Conventionally, in the transport of semiconductors, liquid crystals, and the like, it is necessary to avoid contaminating a clean environment in these processes. Therefore, in order to avoid greetings caused by contact, the power supply to the transport vehicle that carries out these transports requires one conductor connected to the power supply.
A movable carrier equipped with a non-contact power supply device which is fixedly disposed as a secondary side and which non-contactly supplies electric power to the current flowing through the primary side by utilizing an electromagnetic induction phenomenon. A transport system is employed. Conventionally, in this contactless power supply device, as shown in FIG. 3, in order to obtain a required load voltage from a current flowing to the primary side by a secondary side pickup coil having a small number of turns, a load and a resonance capacitor C2 are connected. The branch circuits connected in parallel are connected to both terminals of the secondary side pickup coil. In such a state, the inductance L2 of the secondary side pickup coil and the resonance capacitor for a high frequency current of several kilohertz to several tens of kilohertz, in which the upper limit of the frequency is suppressed in order to reduce the size of the device and to suppress electromagnetic noise, A required load voltage is obtained by a high voltage obtained at both terminals of the resonance capacitor C2 by utilizing a resonance phenomenon between the capacitance of C2 and the capacitance.

[0003]

However, according to the conventional method, regardless of the magnitude of the load, the resonance between the inductance L2 of the secondary side pickup coil and the capacitance of the resonance capacitor C2 is always close to resonance. As a result, there is a problem that a large current flows through the winding of the secondary-side pickup coil particularly under a light load, and the winding is overheated. In order to avoid or reduce overheating of the winding at light load, a method of switching on a non-resonant circuit at light load (see Japanese Patent Application Laid-Open No. 8-501435), or connecting a saturable reactor in parallel with the load And a method of suppressing a rise in terminal voltage of the secondary-side pickup coil or connecting an impedance inverting circuit in parallel with the load to suppress the current of the winding of the secondary-side pickup coil at light load. 308150) and the like. However, each of these methods requires an extra circuit and control, so that there has been a problem that the apparatus is complicated and the cost is increased.

[0004] In view of the problems of the non-contact power supply device mounted on the conventional transport vehicle for a transport system, the present invention autonomously controls the current flowing through the winding of the secondary pickup coil according to the magnitude of the load. And to provide a non-contact power supply device to be mounted on a transport vehicle for a transport system, which is capable of reasonably adjusting and reducing the overheating of the windings at a light load. I do.

[0005]

To achieve the above object, a contactless power supply device mounted on a carrier for a carrier system according to the present invention uses a lead wire connected to a power supply as a primary side and flows to the primary side. In a non-contact power supply device mounted on a transport vehicle for a transport system in which electric power is obtained from an electric current by a secondary-side pickup coil using an electromagnetic induction phenomenon in a non-contact manner, a secondary mounted on the transport vehicle A branch circuit having a load and a resonance capacitor connected in series is connected to both terminals of the side pickup coil.

[0006] The non-contact power supply device mounted on the carrier for the carrier system has two terminals of a secondary side pickup coil.
Since the branch circuit is connected by connecting the load and the capacitor for resonance in series, the current flowing through the winding of the secondary pickup coil can be autonomously and rationally adjusted according to the size of the load, and It is possible to avoid the problem of overheating of the winding of the secondary pickup coil at light load without adding an expensive circuit and a control circuit. In addition, since the number of turns of the secondary pickup coil is large, it is easy to manufacture the coil with the inductance of the secondary pickup coil mounted on each vehicle as close to the same value as possible, and it is easy to carry out a large number of conveyances. Power can be supplied stably and contactlessly to vehicles.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a non-contact power supply device mounted on a carrier for a carrier system according to the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of a non-contact power supply device mounted on a carrier for a carrier system according to the present invention. This non-contact power supply device uses a conductor connected to a power supply E as a primary side and non-contactly obtains power from a current I1 flowing through the primary side by a secondary side pickup coil using an electromagnetic induction phenomenon. In the non-contact power supply device mounted on the transport vehicle for a transport system, a load and a resonance capacitor C2 are connected in series to both terminals a and b of a secondary pickup coil mounted on the vehicle. Circuit circuits are connected.

FIG. 2 is a front sectional view of a secondary pickup coil of a non-contact power feeding device mounted on a movable carrier. The secondary pickup coil is configured by winding the winding 12 of the secondary pickup coil around the center leg of the E-shaped core 13. The conductors 11a and 11b are connected to a power source and are made of reciprocating conductors fixedly arranged on the track side.
Is the primary side, the magnetic flux generated by the current flowing through the primary side is introduced into the central leg of the E-shaped core 13, and the electromagnetic induction phenomenon is used between the terminals of the winding 12 of the secondary side pickup coil. Try to get an induced voltage. To multiply this induced voltage, the inductance L2 of the secondary side pickup coil is used.
A required load voltage can be obtained by a high voltage generated due to a resonance phenomenon between the capacitance of the resonance capacitor C2 connected to the outside of the secondary side pickup coil.

[0010] A conventional wireless power transfer device is shown in FIG.
As shown in the figure, the branch circuit connected between the terminals a and b of the secondary side pickup coil mounted on the carrier is
The load and the resonance capacitor C2 are connected in parallel. For this reason, by utilizing the resonance phenomenon between the inductance L2 of the secondary side pickup coil and the capacitance of the resonance capacitor C2, the required load voltage is reduced by the resonance high voltage obtained at both terminals of the resonance capacitor C2. Therefore, a required load voltage can be obtained from the current flowing to the primary side using the secondary side pickup coil having a relatively small number of turns.

However, regardless of the magnitude of the load, the inductance L2 of the secondary side pickup coil and the capacitance of the resonance capacitor C2 are connected in parallel, and a state close to resonance is always maintained. At the time, a large current flows through the winding 12 of the secondary pickup coil,
There was a problem that the winding 12 was overheated. As a method of avoiding or reducing overheating of the winding 12 at the time of light load,
Switching of non-resonant circuit at light load, connection of saturable reactor in parallel with load, suppression of increase in terminal voltage of secondary side pickup coil, connection of impedance inverting circuit in parallel with load, light load At this time, the current of the winding 12 of the secondary side pickup coil is suppressed, so that more circuits and controls than necessary are required, the configuration becomes complicated, and cost increase cannot be avoided.

However, in this embodiment, a branch circuit formed by connecting the load and the resonance capacitor C2 in series is connected between the terminals a and b of the secondary pickup coil mounted on the carrier. Therefore, the current flowing through the winding 12 of the secondary pickup coil changes autonomously according to the magnitude of the load. For example, the light load limit is the load end open, but when the load is released, the current flowing through the winding 12 of the secondary pickup coil becomes zero,
A large current does not flow through the winding 12 of the secondary side pickup coil at the time of light load, which is a problem in the conventional method, and therefore, the problem of overheating of the winding 12 can be prevented.

Since it is necessary to maintain a required load terminal voltage even when the load is released, the number of turns of the secondary pickup coil is set to be several times larger than that of the conventional method. Thereby, the winding 12 of the secondary side pickup coil
The current required to flow through the secondary winding becomes smaller in proportion to the number of turns, and a thinner wire can be used, so that the present invention is not disadvantageous in comparison with the conventional method with respect to the net weight of the winding 12 of the secondary pickup coil.

In a transfer system, a plurality of transfer vehicles equipped with a non-contact power supply device of the same specification may receive power from a primary conductor through which a current of the same frequency flows. It is necessary to make the inductance L2 of the secondary side pickup coil mounted on the vehicle as close to the same value as possible. In such a case, a coil having a large number of turns as in the present invention has an advantage that it is easier to manufacture a coil having a smaller inductance value than a coil having a small number of turns as in a conventional method.

In the present invention, since the voltage difference between the terminal voltages of the secondary pickup coil and the resonance capacitor C2 becomes the load voltage, it is applied to the secondary pickup coil and the resonance capacitor C2 as compared with the conventional system. Although the voltage increases, the voltage can be suppressed to 1.5 kV or less in a normal transport system, so that an expensive insulation technique is not required and cost can be avoided.

[0016]

According to the non-contact power supply device mounted on the carrier for the carrier system of the present invention, the current flowing through the winding of the secondary side pickup coil can be autonomously and rationally adjusted according to the magnitude of the load. It is possible to avoid the problem of overheating of the winding of the secondary side pickup coil at light load without adding an expensive circuit and control,
An inexpensive transport system non-contact power supply device can be provided. Also, since the number of turns of the secondary pickup coil is large, it is easier to manufacture the coil with the inductance of the secondary pickup coil mounted on each car as close as possible to the same value as possible. Thus, it is possible to realize a transport system that can stably and non-contactly supply power to a large number of transport vehicles.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a non-contact power supply device mounted on a carrier for a carrier system of the present invention.

FIG. 2 is a front view of the wireless power supply device.

FIG. 3 is a circuit diagram of a conventional example.

[Explanation of symbols]

E power supply M Mutual inductance between primary conductor and secondary pickup coil I1 Current flowing in primary conductor L1 Primary inductance L2 Inductance of secondary pickup coil C2 Resonant capacitors a, b Secondary Terminal of the side pickup coil L2

Claims (1)

[Claims] 1. A conductor connected to a power supply is used as a primary side.
From the current flowing to the primary side, using the electromagnetic induction phenomenon,
In a non-contact power feeding device mounted on a transport vehicle for a transport system in which power is contactlessly obtained by a secondary pickup coil, a load and a resonance capacitor are connected to both terminals of a secondary pickup coil mounted on the vehicle. A non-contact power supply device mounted on a transport vehicle for a transport system, wherein a branch circuit formed by connecting the power supply in series is connected.