JPH10248182A - Primary conductive passage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a primary conductive passage which can suppress a change in a resonance frequency when the number of loads on the primary conductive passage is at the definite number of loads or higher. SOLUTION: When a plurality of conductive modules 41, 42 are connected so as to constitute a primary conductive passage, the modules are connected so as to be piled up, and the primary conductive passage is constituted to be a loop shape. A change in a resonance frequency can be suppressed by a zero- inductance cable 49, a load capacity which can be loaded is increased sharply, and, as a result, a carrier capacity can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution facility, particularly to a facility for transmitting induced power by a high-frequency resonance current flowing through a primary conductive path, and more particularly to a means for increasing the number of power reception units on the primary conductive path.

[0002]

BACKGROUND OF THE INVENTION Conventional methods of supplying power to a moving vehicle while being supplied with power have long been problematic. That is, the friction of the sliding brush along the fixed feed rail is a risk of wear, dust generation, intermittent loss of electrical contacts, sparks and electric shock.

The inductive power distribution system shown in FIG. 1 uses an alternating magnetic field around a fixed primary conductive path to induce current through a secondary conductor at a distance from the primary conductive path to provide direct contact. Overcome many of the problems in a way that eliminates. FIG.
Is a conductor for the current-carrying track and comprises at least one preferred primary conductive path 12. In most cases,
The primary conductor is a designated truck 13 on which the truck 11 runs.
However, intermittent use of inductive power (eg, at designated trolley stations) and intermediate energy storage in trolleys is also possible. The switching power supply on the left side of FIG. 1 includes an inductor 17 for efficiently supplying a constant current from a voltage source, and a split inductor 16 for supplying power to one of the solid state switches 18 (both inductors 16 and 17 are both connected). (Both operating frequencies are high), a resonance circuit including an inductor and a primary conductive path 12 and a resonance capacitor 15.

[0004] Normally, the switches are driven in complementary mode by zero-crossing sensors, so that their operation is at resonance 1
The oscillating current detected in the next conductive path 12 is increased. The primary circulating current does not flow through the switch, but flows through "T
It should be noted that there is only an "opping up" current. Control and protective measures are not shown here and are generally performed by changing or interrupting the input voltage.

[0005] The track 13 may be constructed of an exposed structure such as a railroad track, a conveyor track or a monorail, or may be an invisible path indicated by magnetic fields emanating from one or more conductors hidden in the road or floor. Be composed.

[0006] By scaling up the power handling electronics and the number of vehicles or motors and their respective motor drive circuits, larger facilities can be constructed without departing from the novel concept described herein. Because specific voltage limits are defined, it is desirable to divide long tracks into sections. Each is powered by one of a number of individual power sources.

The current practice in the field of resonant inductive power loops to which these improvements are applied generally consists of providing a resonant power supply connected to a single conductor loop. Typical Q values under the action of the load are about 2 or 3. One truck module is approximately 10 to 100 meters long.

[0008] Typically, the module capacitor is about 1.6 microfarads, and a typical inductance is about 3 microhenries per meter of track. The self-inductance distributed in the loop is generally used as an inductance of a resonance circuit that is energized by a resonance power supply disposed at one end of the loop.

Due to the current semiconductor rating and safety considerations, the usable voltage is limited to about 600 V.
It has proven difficult to supply sufficient power to a very long pure inductive primary loop. This preferred embodiment uses transmission line theory, and especially π coupling theory. This embodiment makes it possible to extend the line length with relatively little investment in the capacitor.

The use of high frequency resonant currents in the primary and secondary conductors has led to inefficiencies in the distribution of inductive power and recent developments in driving long lines with sufficient power are described in WO 93/23909. This allowed the use of improved inductive power equipment as described. The equipment is such that the primary conductive module shown in FIG. 2 is connected as shown in FIG. 3 to suppress the resonance frequency. FIG. 2 is a circuit diagram showing a resonant closed circuit including two distributed inductances 21 and 22 and two capacitors 23 and 24, and having an inductance cable 25 coupling nodes having the same phase and amplitude. Inductance cable 25 is defined as an infinite length cable, preferably formed from a symmetric pair of conductors. The one conductor carries currents of approximately the same amplitude as the current of the other conductor, but of opposite phase, and the conductors of the pair have as common a magnetic field space as possible.
The magnetic field developed by one conductor tends to cancel the magnetic field by the other conductor. FIG. 3 shows two separate capacitors 33, 34 with distributed inductances 31, 32 distributed within a unit length of the track conductor used to extend the track while limiting possible oscillation modes.
FIG. 2 is a circuit diagram illustrating a series of modules each configured from and an individual zero inductance cable 35.
By the way, when a plurality of loads are fed from the primary conductive path, if the total amount of received power exceeds a certain value with respect to the amount of power supplied to the primary conductive path, one load depends on the load condition of each load. There is a problem that the resonance frequency supplied to the next conductive path varies.

[0011]

By the way, the problem that the resonance frequency supplied to the primary conductive path fluctuates will be described in more detail. When a plurality of loads are supplied from the primary conductive path, a total The state in which the amount of received power exceeds a certain value with respect to the amount of power supplied to the primary conductive path includes a case where the number of loads is equal to or more than a certain number, that is, in this case, a load that can be applied to the conductive path If the number is not limited, it means that the resonance frequency supplied to the primary conductive path fluctuates, and as a result, there is a problem that resonance induction power supply cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a primary conductive path capable of suppressing a change in resonance frequency when the number of loads on the primary conductive path exceeds a certain number. The purpose is to configure.

[0013]

The primary conductive path of the present invention is:
Consist of at least two conductive modules, each of which has a resonance frequency that matches the resonance frequency of the equipment,
In addition, each of the primary conductive modules is a primary conductive path of the resonance induction distribution equipment, and each module is formed by combining at least two modules that can be connected to adjacent power paths together to form a long conductive path, and has a multi-loop structure. Wherein the conductive module has at least one series resonant capacitor.

According to the present invention, the primary conductive path can be easily formed into a loop by using a conductive module, and by connecting a zero-inductance cable to the conductive module, fluctuations in the resonance frequency can be suppressed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a circuit configuration diagram of a primary conductive path formed by combining two conductive modules to form a double loop. In the figure, a first conductive module 41 has connection terminals 51, 52, 5 for connecting to other modules.
3 and 54, and the second conductive module 42 also has connection terminals 55, 56, 57 and 58 (not shown).

The modules 41 and 42 form a double loop-shaped primary conductive path by connecting the connection terminal 53 to the connection terminal 56 and the connection terminal 54 to the connection terminal 55, respectively. , 52 are supplied with a high frequency current. Connection terminal 5 which is the terminal of primary conductive path
7 and 58, a capacitor (not shown) is connected, and at a predetermined distance, a capacitor 47 and a capacitor 48 are connected in parallel to the conductive path.
Both ends of the capacitor 7 and the capacitor 48 and between both ends of the capacitor 48 and the termination capacitor are short-circuited by the zero inductance cable 49.

The conductive module 41 forms a series resonance circuit with distributed inductances 43 and 44 of conductors and a capacitor 47, and the other conductive module 42 similarly has
Conductor distributed inductance 45, 46 (not shown)
And the capacitor 48 constitute a series resonance circuit.

That is, between predetermined primary conductive paths (terminal 51
From the terminal 53 to the terminal 53 or from the terminal 55 to the terminal 57).

The inductive power equipment has at least one
It consists of a loop of at least two parallel conductive paths, preferably laid along a limited route, consisting of a secondary conductive path. This primary conductive path, which carries a large amount of power at a high frequency, is preferably made of a large surface area litz wire capable of carrying a corresponding level of current.

The preferred operating frequency is generally in the range of 10 KHz to 50 KHz, and reflects, in particular, the constraints imposed by the solid state switches used, conductor losses, and the radiated power, but the principle is 50 KH.
It can be applied to a much wider range of frequencies, such as from z to 1 MHz.

The preferred embodiment is formed with an operating frequency on the order of 10 KHz and active power levels of 150 W and 500 W, the former at 600 V, 80 meters and the latter at 60 meters.
It is possible to power a truck at 0V and 200 meters long. A typical power supply output of a large but still practical power supply is on the order of 600V, and a typical circulating resonance current is on the order of 70A. In this embodiment, the primary conductive path of the double loop is formed by two conductive modules. However, the number of loops may be increased by increasing the number of connected modules.

Further, in this embodiment, the length of one module is equal to the length of the primary conductive path. However, for example, three modules are connected as one unit, and the units are stacked to form a primary unit. It may be configured as a conductive path.

[0023]

As described above, when a plurality of conductive modules are connected to form one primary conductive path, the modules are connected so as to be stacked, so that the primary conductive path is easily formed into a loop. It is possible to do. Furthermore, the variation of the resonance frequency can be suppressed by the zero inductance cable, and the load capacity that can be applied is dramatically increased.
As a result, the transport capacity can be increased.

[Brief description of the drawings]

FIG. 1 is a diagram showing a primary conductive path including an energizing track.

FIG. 2 is a circuit diagram having a zero-inductance cable that couples contacts of the same phase and amplitude in a resonant closed circuit of two distributed inductances and two capacitors.

FIG. 3 shows a series of modules, each composed of two individual capacitors, with a distributed inductance distributed within a unit length of the track conductor, used to extend the track while limiting possible oscillation modes. FIG. 4 is a circuit diagram illustrating the configuration;

FIG. 4 is a circuit configuration diagram of a primary conductive path according to one embodiment of the present invention.

[Description of Signs] 11 cart 12 primary conductive path 13 track 18 solid state switch 21, 22, 31, 43, 44, 45 distributed inductance 23, 24, 33, 34, 47, 48 capacitor 25, 35, 49 zero inductance Cable 50 Power supply 41, 42 Conductive module

Claims (1)

[Claims] 1. A system comprising at least two primary conductive modules, each of which has a resonance frequency that matches the resonance frequency of the installation, and wherein each of said primary conductive modules is a primary conduction path of a resonance induction distribution installation. In each module, at least two modules that can be connected to adjacent electric paths are combined together to form a long conductive path, and are integrated into a multi-loop conductive path, wherein the conductive module is connected to at least one series resonant capacitor. A primary conductive path comprising: