KR101953571B1 - Semiconductor transformer for railway vehicle with wireless power transmission coil and wireless power transmission coil thereof - Google Patents

Abstract

The present invention relates to a vehicular semiconductor transformer having a wireless power transmission coil and a wireless power transmission coil thereof. A power supply DC / AC inverter for converting a DC power of the power supply AC / DC converter into a high frequency AC power supply, a power supply DC / AC inverter for converting the AC power of the power supply line into a DC power supply, A radiofrequency current collecting coil for collecting the electromagnetic induction energy of the radiofrequency coil and converting the electromagnetic induction energy into electric energy; and a high-frequency alternating-current power source for converting the high- A vehicle-use semiconductor transformer constituted by an AC / DC converter for converting output to a power source; To provide a wireless power transfer coil for use in transferring bus power to the semiconductor transformer.
The semiconductor transformer according to the present invention is characterized in that the primary side and the secondary side are physically separated so that the insulation between the high voltage on the primary side and the low voltage on the secondary side is easy and the primary side and the secondary side of the semiconductor transformer are physically separated, And the cooling system of the secondary side can be separated.

Description

TECHNICAL FIELD [0001] The present invention relates to a semiconductor transformer for a vehicle having a wireless power transmission coil, and a wireless power transmission coil for the same. BACKGROUND OF THE INVENTION [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular semiconductor transformer having a wireless power transmission coil and a wireless power transmission coil thereof. More particularly, the present invention relates to a high-frequency transformer applied to a vehicular semiconductor transformer, The present invention relates to a vehicle semiconductor transformer using a wireless power transmission system and a wireless power transmission coil usable in the semiconductor transformer.

In general, the main power conversion system of an electric railway vehicle is constituted by a DC / AC three-phase inverter which is a main transformer 1, an AC / DC converter 2 and a motor drive inverter 3 as shown in Fig. 1 .

At this time, the main transformer 1 is supplied with a voltage of 60 Hz and 25 kV through a catenary and lowering the voltage to about 1 kV to 3 kV, as disclosed in Japanese Patent Application No. 10-1621803 and No. 10-0881086 have. The AC / DC converter connected to the output side of the main transformer converts the AC voltage of several kV into a DC voltage of a certain size and supplies it to the motor drive inverter to enable the vehicle to run.

The main transformer (1) and the AC / DC converter (2) occupy the largest load among the electric components in the vehicle, and are light components. In particular, since the main transformer operates at a low frequency of 60 Hz, the inductance required for impedance matching is large, so that the transformer winding must be wound a lot or the iron core must be used more frequently.

Therefore, much research has been carried out to reduce the weight of the main transformer (1) and the AC / DC converter (2) operating at the commercial frequency. One of them is the semiconductor device, so that the operating frequency of the transformer is higher than 60Hz Increasing from several kHz to tens of kHz reduces the volume and weight of the transformer. That is, referring to FIG. 2, a conventional main transformer operating at 60 Hz is replaced with a high-frequency transformer 4 operating at a high frequency, a low frequency and high voltage input power is converted into a high frequency voltage / current using a semiconductor device, A device that converts low-voltage DC to a vehicle is called a solid-state transformer or an intelligent transformer.

Here, as shown in FIG. 3, a high-frequency transformer used in a semiconductor transformer as well as a conventional main transformer is manufactured in the form of a core-type or a shell-type.

This conventional transformer structure is suitable for a high efficiency system because it can reduce the gap between the primary winding and the secondary winding and raise the flux linkage. However, in the case of a railway vehicle to which a high voltage of 25 kV is applied, since there is an insulation problem between the primary side and the secondary side winding, a separation and insulation structure for insulation is disposed between the primary side and the secondary side winding, There is a disadvantage that the weight and the volume become large.

This problem exists even when a conventional commercial frequency transformer is replaced with a semiconductor transformer because the high frequency transformer used in the semiconductor transformer applies the existing transformer structure as it is.

However, since the high-frequency transformer has a high operating frequency, it is possible to transfer power even with small inductance, and the size of the transformer can be drastically reduced. In view of insulation, however, insulation required between the primary side and the secondary side winding and the adjacent transformer Since the level is equal to or more than 25kV, sufficient insulation separation between the windings is required to increase the volume of the high-frequency transformer. If the insulation method such as insulating oil is used in consideration of insulation and cooling, it is effective in reducing the weight and volume of the transformer not.

Reference 1: Registration No. 10-1621803 Reference 2: Registration No. 10-0881086

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a high frequency transformer applicable to a vehicle semiconductor transformer in place of a conventional core type or shell type transformer, The present invention provides a vehicle semiconductor transformer using a wireless power transmission system in which power transmission is performed by a distance of several to several tens of centimeters and a wireless power transmission coil usable in the semiconductor transformer.

In order to solve such a technical problem,

A power supply DC / AC inverter for converting a DC power of the power supply AC / DC converter into a high frequency AC power supply, a power supply DC / AC inverter for converting the AC power of the power supply line into a DC power supply, A radiofrequency current collecting coil for collecting the electromagnetic induction energy of the radiofrequency coil and converting the electromagnetic induction energy into electric energy; and a high-frequency alternating-current power source for converting the high- And a power supply AC / DC converter for converting the AC power to a power source. The present invention provides a vehicle semiconductor transformer having a wireless power transmission coil.

In this case, the power supply DC / AC inverter is a resonance type inverter, and the power collecting AC / DC converter is a resonance type converter.

Also, the power supply AC / DC converter, the power supply DC / AC inverter, and the wireless power supply coil are mounted in a single package and modularized. The wireless power collecting coil and the power collecting AC / DC converter are modules mounted in a single package.

In addition, the transmitting module may further include a power supply tuning capacitor, and the receiving module may further include a power collection tuning capacitor.

The transmission module and the reception module are provided in a one-to-one correspondence manner.

In addition, a plurality of transmission modules are provided, and the reception module is provided with a plurality of transmission modules corresponding to each other at a ratio of 1: 1.

In addition, a plurality of the transmission modules may be provided, and the wireless current collecting coil of the receiving module may include one wireless current collecting coil extended to receive the magnetic field generated by the plurality of transmitting modules.

In addition, a plurality of transmission modules are provided, and a plurality of reception modules are provided to correspond to the plurality of transmission modules at a ratio of 1: 1, and input / output ends of the wireless collection coils of the reception modules are connected in series. do.

The present invention also provides

A radio power transmission coil for wireless power transmission of a semiconductor transformer for a vehicle, said coil having a width of 50 to 300 mm, a length of 50 to 300 mm, a height of 50 to 300 mm and a core material of 5 to 300 mm in thickness, Type core, and winding the one or more turns around the core. The present invention also provides a wireless power transmission coil for a vehicle semiconductor transformer.

In this case, the core is made of any one of ferrite, iron core and composite material.

The coil is a wireless power supply coil and a wireless power collecting coil of a semiconductor transformer.

The vehicle semiconductor transformer having the wireless power transmission coil according to the present invention has the following advantages.

First, since the primary side and the secondary side of the semiconductor transformer are physically separated, the insulation between the high voltage of the primary side and the low pressure of the secondary side is easy, and the primary side and the secondary side of the semiconductor transformer are physically separated, The cooling system on the vehicle side can be separated.

In addition, since the leakage inductance of the wireless power transmission system is large, there is no need to add a separate inductor.

In addition, in order to construct a multi-winding parallel arrangement on a primary side or a secondary side of a conventional transformer, all the coils used for the primary side or the secondary side must be wound on one core for flux linkage, and the circulation current is generated between the coils due to the unbalance of the magnetic fluxes generated in the respective windings, the semiconductor transformer according to the present invention has such a circulation current It is very small and efficiency is high in parallel operation.

In addition, if the existing transformer is constituted by multi-winding and parallel operation using the transformer, the primary sides of the transformer are all wound around the same core, so that it is impossible to module the high frequency transformer. Similarly, when a wireless power transmission technology is used, mutual flux linkage between windings is small even in multi-winding in parallel operation, so that each winding can be modularized, It is advantageous for maintenance and hot swap.

1 is a block diagram of a main power conversion system of a conventional railway vehicle.
2 is a configuration diagram of a semiconductor transformer for a conventional railway vehicle.
3 is a diagram illustrating a conventional core-type and shell-type transformer.
4 is an overall configuration diagram of a vehicle semiconductor transformer having a wireless power transmission coil according to the present invention.
5 is a configuration diagram of a vehicle semiconductor transformer having a wireless power transmission coil according to a first embodiment of the present invention.
6 is a configuration diagram of a wireless power transmission coil usable in a basic configuration of a vehicle semiconductor transformer having a wireless power transmission coil according to the present invention.
7 is a view showing a detailed size of an I-type coil for wireless power transmission usable in a basic configuration of a semiconductor transformer for a vehicle having a wireless power transmission coil according to the present invention.
8 is a configuration diagram of a vehicle semiconductor transformer having a wireless power transmission coil according to a second embodiment of the present invention.
9 is a block diagram showing an example of a wireless power transmission coil usable in the semiconductor transformer of FIG.
Fig. 10 is a configuration diagram showing another example of a wireless power transmission coil usable in the semiconductor transformer of Fig. 8; Fig.
11 is a configuration diagram of a vehicle semiconductor transformer having a wireless power transmission coil according to a third embodiment of the present invention.
12 is a configuration diagram of a vehicle semiconductor transformer having a wireless power transmission coil according to a fourth embodiment of the present invention.
13 is a configuration diagram of a vehicle semiconductor transformer having a wireless power transmission coil according to a fifth embodiment of the present invention.
14 is a configuration diagram of a vehicle semiconductor transformer having a wireless power transmission coil according to a sixth embodiment of the present invention.
15 is a simulation circuit diagram of a 400 kW class wireless power transmission system based semiconductor transformer of the present invention.
16 is a graph of a simulation result of a 400 kW class wireless power transmission system based semiconductor transformer of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which a vehicle semiconductor transformer having a wireless power transmission coil according to the present invention and a wireless power transmission coil thereof are described.

Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications may be present.

4, a semiconductor transformer for a vehicle having a radio power transmission coil according to the present invention includes a DC / AC high-frequency inverter and a high-frequency transformer and an AC / DC converter in a configuration of a conventional semiconductor transformer, DC converter 220 is replaced with a DC / AC inverter 120, a wireless feeder coil 130, a wireless receiver coil 210, and an AC / DC converter 220, It is easy to insulate, can separate the cooling system of 1st and 2nd sides, and has a large leakage inductance, so there is no need to add additional inductor. It can be applied to various vehicles such as automobiles as well as railway cars. have.

The vehicle semiconductor transformer having the wireless power transmission coil according to the present invention includes a power supply AC / DC converter 110 for converting the AC power of the power supply line 10 to a DC power supply, a power supply AC / DC converter 110 A power supply coil 130 for generating electromagnetic induction energy by a high frequency AC power source of the power supply DC / AC inverter 120; And a power collecting coil 210 for collecting the electromagnetic induction energy of the wireless power feeding coil 130 and converting the electromagnetic induction energy into electric energy, a power collecting coil 210 for converting the high frequency AC power into a DC power And an AC / DC converter 220.

Of course, the direct current power converted by the AC / DC converter 110 is supplied to the inverter 20 for controlling the motor 22 and to the auxiliary load 32 such as an in- Power can be supplied to the auxiliary power unit (SIV) 30 for driving.

Hereinafter, the constitution of each part of the present invention will be described in detail.

In the semiconductor transformer of the present invention, the power supply DC / AC inverter 120 and the power collecting AC / DC converter 220 may include a resonance type inverter and a resonance type converter for driving an LC resonance type resonant tank for wireless power transmission Core-type and shell-type transformers used in conventional semiconductor transformers are designed to transmit power at a minimum distance of one to several tens of centimeters from the primary side and the secondary side, The wireless power feeding coil 130 and the wireless power collecting coil 210 of the system.

The semiconductor transformer for a vehicle according to the present invention has a resonance type power supply for each level of a power supply DC / AC inverter 110 and an AC / DC converter 220 connected in series to a high voltage input terminal of the power supply line 10 The wireless power feeding coil 130 and the wireless power collecting coil 210 can be configured so that they can be completely modularized and packaged by a transmitter module and a receiver module for each level have.

Referring to FIG. 5, the wireless power system of a vehicle semiconductor transformer for wireless power transmission can be completely separated into a transmitter module 100 and a receiver module 200. The transmitter module 100 includes a power supply AC / DC converter 110, a power supply DC / AC inverter 120, a wireless power supply coil 130, and a power supply tuning capacitor 140 ) Can be mounted and modularized in a single package.

The receiver module 200 may also include a wireless power collecting coil 210, a tuning capacitor 230 and an AC / DC converter 220 in one package It can be modularized.

In this case, the transmission module 100 and the reception module 200 correspond to each other at a level of 1: 1, a plurality of transmission modules 100 are connected in series, and a plurality of reception modules module 200 are connected in parallel.

An example of a wireless power transmission coil usable in the vehicle semiconductor transformer structure according to the present invention is shown in FIGS. 6 and 7. FIG. In this case, the distance (Air-gap) between the wireless power feeding coil 130 and the wireless power collecting coil 210 constituting the transmitting module 100 and the receiving module 200 for each level is about 4 to 5 cm The plurality of cores 132 and 212 are formed in I-type so as to improve the magnetic flux link between the wireless power feeding coil 130 and the wireless current collecting coil 210, The number of turns is reduced to make the coil.

More specifically, the cores 132 and 212 of the wireless power feeding coil 130 and the wireless power collecting coil 210 constituting the transmitting module 100 and the receiving module 200 have a width of 50 to 300 mm, (I-type) using a core material of ferrite or iron core or composite material having a length of 50 to 300 mm and a height of 50 to 300 mm and a thickness of about 5 to 300 mm do.

Then, one turn or more of windings 134 and 214 are wound around the I-type core to fabricate the wireless power feeding coil 130 and the wireless power collecting coil 210.

At this time, the sizes of the coils 132 and 212 required when the wireless feed coils 130 and the wireless power collecting coils 210 of the transmitting module 100 and the receiving module 200 are about 30 to 60 kW per level, The winding configuration is as shown in Fig.

On the other hand, in the structure of the semiconductor transformer for a vehicle according to the present invention, since mutual flux linkage between the wireless power feed coils 130 is very small when using the electromotive force transmission system, Which can be confirmed by the configuration corresponding to the parallel operation in Fig.

The configuration of the wireless power feeding coil 130 and the wireless power collecting coil 210 suitable for such a configuration is as shown in FIG. 6, the wireless power collecting coil 210 of the receiving module 200 receives all of the magnetic fields generated by the transmitting module 100. However, the wireless power collecting coil 210 of the receiving module 200 receives all the magnetic fields generated by the transmitting module 100 And one wireless current-collecting coil 210a extended laterally. That is, a plurality of transmitting modules 100 and one receiving module 200 for each level are associated with N: 1 corresponding structures.

In this case, the number of the wireless power feeding coils 130 can be changed according to the number of levels of the semiconductor transformer, and the width of the wireless power collecting coil 210 can be changed according to the number of levels and the number of the wireless power feeding coils 130 Change.

9, the width of the wireless power collecting coil 210 of the receiving module 200 is widened in order to output a high voltage by receiving all the magnetic fields generated by the plurality of wireless power feeding coils 130.

6, the receiving module 200 may be replaced with a plurality of wireless power collecting coils 130 corresponding to 1: 1 to a plurality of wireless power feeding coils 130, as shown in FIG. 6, The same voltage and current characteristics can be obtained by serially connecting the input and output terminals between the wire collecting coils 210 as shown in FIG. That is, the output terminal of the wireless current collecting coil 210 of one of the receiving modules 200 is connected to the input terminal of the wireless current collecting coil 210 of another adjacent receiving module 200, The wire collecting coil 210 can be continuously connected.

11, the system can simplify the miniaturization, the AC / DC converter 220 and the control of the wireless current collecting coil 210 on the receiving side, Which is advantageous for connection of a tuning capacitor 230 for collecting the input signal.

In the meantime, when the receiving side is not constituted by one system as shown in FIG. 8 and FIG. 11 and the number of levels is large or the voltage and current capacity of the semiconductor switch is small, It can be configured as shown in FIG. That is, a plurality of transmission modules (100) are provided corresponding to one receiving module (200) as a single piece, and a plurality of receiving modules (200) And can be connected to a plurality of transmitter modules 100 of many levels.

In this case, one collection tuning capacitor 230 may be provided for each receiver module 200, or a plurality of collection tuning capacitors 230 may be used.

In the present invention, a total of 25 transmission modules 100 are connected in series and a total of 5 reception modules 200 are connected in parallel as shown in FIG. 14 when a large-capacity 2 MVA class semiconductor transformer is manufactured using a wireless power transmission technology. You can connect.

At this time, the I-type coil of FIG. 9 can be used as the wireless power feeding coil 130 of the transmitting module 100 and the wireless collecting coil 210 of the receiving module 200. FIG.

The parameters of the designed I-type coil are as follows.

Wireless feed coil Wireless collecting coil Self inductance
(Self-inductance) 20 μH 44 μH Mutual inductance
(Mutual-inductance) 3 μH

The above simulation results are shown in FIG. 16 for a 400 kW class system, which is one of the five receiving modules 200 shown in FIG. 14, by using the above parameters. According to this, a voltage of about 1800 Vrms is induced in the final output stage, and the output power is about 400 kW.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The scope of protection of the present invention should be construed under the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

10: feeder line 20: inverter for traction motor control
22: motor 30: auxiliary power supply
32: Auxiliary load 100: Transmission module
110: Power supply dedicated AC / DC converter 120: Power supply dedicated DC / AC inverter
130: wireless power feeding coil 140: power supply tuning capacitor
200: receiving module 210: wireless current collecting coil
220: AC / DC converter for accumulating 230: Collecting capacitor for collecting

Claims (11)

A power supply DC / AC inverter for converting a DC power of the power supply AC / DC converter into a high frequency AC power supply, a power supply DC / AC inverter for converting the AC power of the power supply line into a DC power supply, A radiofrequency current collecting coil for collecting the electromagnetic induction energy of the radiofrequency coil and converting the electromagnetic induction energy into electric energy; and a high-frequency alternating-current power source for converting the high- And an output AC / DC converter for converting the power source into a power source,
Wherein the power supply AC / DC converter, the power supply DC / AC inverter, and the wireless power supply coil are modularized by being mounted in one package;
The wireless power collecting coil and the collecting AC / DC converter are modules mounted in a single package,
Wherein the transmission module includes a plurality of transmission modules, the reception module includes only one reception module, the wireless collection coil includes one wireless collection coil extended to receive a magnetic field generated by the plurality of transmission modules,
Wherein the core of the I type is formed by using a core material having a width of 50 to 300 mm, a length of 50 to 300 mm and a height of 50 to 300 mm and a thickness of 5 to 300 mm, Wherein the coil is wound around the coil.
The method according to claim 1,
Wherein the power supply DC / AC inverter is a resonance type inverter, and the power saving AC / DC converter is a resonance type converter.
delete The method according to claim 1,
Wherein the transmission module further comprises a power supply tuning capacitor, and the receiving module further comprises a power collection tuning capacitor.
delete delete delete delete delete The method according to claim 1,
Wherein the core is made of one of ferrite, iron core and composite material.
delete

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