KR20130072283A - Non-inductive power line for wireless power transfer apparatus - Google Patents

Abstract

PURPOSE: A wireless power transmission apparatus capable of including a cordless power line is provided to remarkably reduce the inductance, thereby fundamentally blocking the magnetic field. CONSTITUTION: An electric line (10) forms the high frequency magnetic flux. An AC power source device (1) enables the high-frequency current to flow in the electric line. A cordless extension line (9) connects the AC power source device and the electric line. The cordless extension line does not generate the magnetic field to the surrounding area. The cordless extension line is comprised of a coaxial cable form.

Description

Non-inductive power line for wireless power transfer apparatus

The present invention provides a wireless power transmission device that transmits power by magnetic induction, and removes a magnetic field generated from an extension line connected between a feed line for generating AC magnetic flux and an AC power device for applying AC power to the feed line. A method for reducing the loss of an AC power supply device.

The present invention relates to a wireless power transmission apparatus that wirelessly transfers electric power by using magnetic induction to an electric railway vehicle moving along a predetermined track or an electric vehicle parked and stopped at a designated place. In the case of existing railroad cars, monorail cars, and trolley buses moving along a defined track, mechanical or electrical means are used to provide the energy required for the propulsion of the vehicle. Existing electric railroads are energized by means of contact through the upper wires, damaging the aesthetics of the city, and causing an accident such as electric shocks due to maintenance and exposure of roads on high-voltage lines. In the case of an electric vehicle that stores and uses electricity in a battery instead of a general engine vehicle, a process of connecting a connector of a cable for supplying electric energy to the connector of the electric vehicle is very troublesome.

In order to solve the power supply problem of the railway vehicle and the charging of the electric vehicle, electric power is wirelessly transmitted by using magnetic induction to an electric railway vehicle moving along a predetermined track or an electric vehicle parked or stopped at a designated place without making electrical contact. There is a growing interest in wireless power transmission schemes. However, when the distance between the AC power supply unit supplying a high frequency current to the feeder line and the power supply line in the feeder line installed on the road surface or the ground becomes long, the feeder line and the AC power supply unit which actually transmits power by magnetic induction are The extension cords that connect are not involved in power delivery at all. In addition, there is a problem in that reactive power loss occurs due to an increase in inductance due to extension lines, and magnetic field effects due to high frequency magnetic fluxes generated by high frequency currents leak to the outside.

The present invention has been devised in view of the above problems, and an object of the present invention is an increase in reactive power loss due to an increase in inductance occurring in an extension line connecting an AC power supply unit supplying a high frequency current to a feed line and a feed line. In order to fundamentally solve the problem caused by the magnetic field, the inductance of the extension line must be drastically reduced.

In order to achieve the above object, the wireless power transmission apparatus according to the present invention, an AC power supply and AC power supply for supplying a high frequency current to the feed line and the power supply line to create a high frequency magnetic flux to wirelessly transfer power to the current collector coil It is composed of a non-inductive extension line that is connected to the feeder line and does not generate a magnetic field.

 One method for providing a non-induction extension line of the present invention is configured in the form of a coaxial cable, the incoming line is placed on the outside of the line is placed on the outside, the inner line between the outer line and the outer line for the electrical insulation between the outer line It is composed by placing the outer shell for insulation.

Another way to provide an induction-free extension is to mix an incoming line consisting of multiple conductors with an insulated coating and an outgoing line consisting of the same number of conductors with an insulated coating in a uniform distribution and having an outer sheath for insulation. .

In the present invention, for the connection of the AC power supply and the extension line and the connection of the extension line and the feed line

 It is preferable to provide a terminal block.

In addition, the terminal block of the present invention is preferably molded with a waterproofing agent to be waterproof.

The non-induction extension line according to the present invention,

First, there is an effect of reducing the increase in reactive power loss due to the increased inductance generated from the AC power supply for supplying high frequency AC power to the feed line and the extension line connecting the feed line.

Second, it can be expected to block the effects of the magnetic field generated in the extension line source.

1 is a configuration diagram of a wireless power transmission device,
2 is a circuit diagram of a wireless power transmission device;
3 is a block diagram of a simplified wireless power transmission apparatus,
4 is a cross-sectional view of a typical wireless power transmission device extension line,
5 is a cross-sectional view taken along an extension line of Embodiment 1 of the present invention;
6 is a cross-sectional view taken along an extension line of Embodiment 2 of the present invention;
7 is a circuit diagram of a power supply facility of a wireless power transmission device.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment not limiting the present invention.

1 shows a general configuration diagram of a wireless power transmission apparatus. AC power supply unit (1) for flowing alternating current through feed line, feed line selection switch (2) for selectively flowing current to multiple feed lines (10a, 10b) with one AC power supply, switch and feed line It comprises an extension line (9a, 9b), feed line (10a, 10b) for connecting the.

2 shows a cross-sectional view A-A 'of a typical extension line. The incoming line 11a and the outgoing line 11b are covered with separate protective tubes 13, and the two lines are separated by a certain distance r, so that when a high frequency current flows, a strong magnetic field is generated around the two lines. An extension inductance is created.

FIG. 3 shows an equivalent circuit diagram of the wireless power transmitter of FIG. 1. The feed line and the extension line have their respective inductances, and the inductance 4 of the extension line not only contributes to power transmission, but also generates a harmful magnetic field, causing loss of AC power supply and high voltage on the feed line. Therefore, the problem becomes serious when the extension line length becomes long.

4 shows a first embodiment of the non-induction extension line according to the present invention. The first embodiment of the non-induced extension line is a coaxial cable structure, which has an inner shell 15 for insulation between the inner line 14a and the outer line 14b and a shell 16 outside the outer line. Since the current flowing through the inner line 14a and the outer line 14b is the same magnitude and opposite in direction, no magnetic field is generated outside the extension line and the inductance is almost zero.

Fig. 5 shows a second embodiment of the non-induction extension line according to the present invention. In the second embodiment of the non-induction extension line, the outgoing line 17b composed of the same number of conductors of the same shape as the inlet line 17a composed of a plurality of conducting wires covered with the insulating sheath 15 is mixed together in a uniform distribution, and then The outer surface is covered with an insulating coating 16 on the outside thereof to form a configuration. As with the coaxial cable, the magnetic fields generated by small conductors cancel out all the magnetic fields outside the extension line, and the inductance is almost zero.

6 is a circuit diagram of a power supply facility to which a non-induction extension line of the wireless power transmission device of the present invention is applied. In order to connect the AC power supply 1 with one end of the extension line 9, terminal ends of the inner line connecting line 20 connected with the inner line of one end of the extension line and the outer line connecting line 19 connected with the outer line are terminal-processed ( 18), the inner line connecting line 20a connected to the inner line of the other end of the extension line and the outer line connecting line 19a connected to the outer line to connect the feed line 10 and the other end of the extension line 9 to each other. Terminal is connected to the terminal block (21). The terminal blocks 18 and 21 of FIG. 7 are waterproofed using a waterproofing agent in order not to be exposed to the outside because high frequency current of the AC power supply flows. When the extension line is provided as shown in FIG. 6, the extension line inductance 4 shown in FIG. 3 disappears, thereby preventing a problem due to an increase in reactive power loss due to an increase in inductance and a magnetic field due to a high frequency current in an extension line section. .

1: AC power supply 2: switch
3: capacitor 4: extension inductance
5: gap (g) 6: current collector coil
7: capacitor 8: load
9, 9a, 9b: extension line 10, 10a, 10b: feed line
11a, 11b: feeder 12: sheath
13: sheriff 13: sheriff
14a: inner line 14b: outer line
15: outer shell (insulator) 16: outer shell (insulator)
17a, 17b: conducting wires 18, 21: terminal block
19, 19a: outer line connecting line 20, 20a: inner line connecting line
21a, 21b: current collector r: line distance

Claims (5)

A wireless power transmission device for wirelessly transferring power to a current collector coil by magnetic induction, comprising: a feed line (10) for generating a high frequency magnetic flux;
An AC power supply device (1) for flowing a high frequency current through the feed line;
An inductive extension line 9 which connects the AC power supply and the feed line but does not generate a magnetic field around the power supply line;
Wireless power transmission device comprising a
The method according to claim 1,
The non-induced extension line 9 is configured in the form of a coaxial cable, the entry line is disposed on the outside of the inner line, but the insulation layer for the electrical insulation between the inner line and the outer line, the insulation on the outside of the outer line Wireless power transmission device having a non-inductive power line, characterized in that the outer shell for
The method according to claim 1,
The non-induction extension line (9) is composed of a mixture of the incoming line with a plurality of insulation coating and the outgoing line with the same number of insulation coating in a uniform distribution, the non-induction, characterized in that the outer sheath for a plurality of conductor bundles outside the insulation. Wireless power transmitter with power line
The method according to claim 1,
Wireless power transmission device having a non-induction power line characterized in that the terminal block (18, 21) is used to connect the AC power supply and the extension line and the extension line and the feed line.
The method of claim 4,
Wireless power transmission device having a non-inductive power line, characterized in that for molding the terminal block (18, 21) with a waterproofing agent to be waterproof.

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