KR101744577B1 - Design Apparatus and Method of Wireless Power Transmission System for Catenary Status Monitoring System - Google Patents

Design Apparatus and Method of Wireless Power Transmission System for Catenary Status Monitoring System Download PDF

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KR101744577B1
KR101744577B1 KR1020150146903A KR20150146903A KR101744577B1 KR 101744577 B1 KR101744577 B1 KR 101744577B1 KR 1020150146903 A KR1020150146903 A KR 1020150146903A KR 20150146903 A KR20150146903 A KR 20150146903A KR 101744577 B1 KR101744577 B1 KR 101744577B1
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South Korea
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coil
transmission
wireless power
inductance
designing
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KR20170046494A (en
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이승환
이병송
정신명
김명룡
이경표
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한국철도기술연구원
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    • H02J17/00—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M1/00—Power supply lines for contact with collector on vehicle
    • B60M1/12—Trolley lines; Accessories therefor
    • B60M1/13—Trolley wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M1/00—Power supply lines for contact with collector on vehicle
    • B60M1/12—Trolley lines; Accessories therefor
    • B60M1/28—Manufacturing or repairing trolley lines
    • H02J7/025—

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  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention relates to a design apparatus and method for designing a transmission coil and a reception coil of a wireless power transmission apparatus for transmitting electric power to a state monitoring system of a catenary.
The method includes the steps of: obtaining basic information for design; finding possible design areas of the transmit coil and receive coil inductance; inserting a grid into the probable design area searched; Calculating a transmission efficiency and a control stability when the inductance value corresponding to the point is satisfied, comparing the transmission efficiency calculated at the grid point, and finding a combination having the maximum transmission efficiency while satisfying the control stability A transmit coil and a receive coil design method for a wireless power transmission device are disclosed.
According to the present invention, the wireless power transmission apparatus can be designed to have the maximum transmission efficiency according to the installation conditions, and power is supplied to the system for monitoring the state of the cable line using the system, thereby reducing the maintenance and repair cost of the system.

Description

TECHNICAL FIELD [0001] The present invention relates to a system and a method for designing a wireless power transmission system for a catenary condition monitoring system,

The present invention relates to a design apparatus and method for designing a transmission coil and a reception coil of a wireless power transmission apparatus, and more particularly, to a system and method for designing a transmission coil and a reception coil of a wireless power transmission apparatus, And more particularly, to a design apparatus and method for designing a transmission coil and a reception coil of a wireless power transmission apparatus capable of wireless communication.

Trams, trolley buses, electric lines installed in the air to supply electric power to trains or trains are called electric trains. Trains or trains use electric pantographs to get in contact with electric wires to get power. It is very important to maintain and manage such a railway line because it uses a high voltage of about 25kV, which makes it difficult for people to access it.

Therefore, it is necessary to monitor the condition by attaching various sensors to the catenary line. In general, other than the contact force and the amount of pressure between the electric line and the pantograph, various sensors are used to operate the line temperature, displacement, and vibration measurement equipment.

FIG. 1 is a view showing a state monitoring system installed in a conventional electric railway line. Referring to FIG. 1, the conventional state monitoring system includes a DAQ (Data Acquisition) system 110 installed on a movable bracket 101 and capable of storing surveillance data and transmitting the data to the outside, Sensors including a tensile system 121, an accelerometer 122, a displacement meter 123, and the like, and a battery 130 for supplying power to the devices. The various sensors 121, 122, and 123 collect relevant data and send it to the DAQ system 110 by wire. The DAQ system 110 collects data from the sensor and transmits it to the central collecting device via a wireless network or the like do. In order for the sensors 121, 122, and 123 and the DAQ system 110 to operate at all times, a small power of less than DC 5V to 10V must be continuously supplied. However, since a high voltage of 25 kV is applied to the movable bracket 101, the wire bundle or the electric wire, where such equipment is installed, it is impossible to supply electric power from the ground to the wire due to insulation problems. Therefore, the power is supplied using a separate replaceable battery 130 in general.

The use of such an exchangeable battery 130 requires battery charging or replacement when the battery power is exhausted. At this time, the state monitoring system including the battery 130 is installed in the structure of the movable bracket 101 with high voltage There is a problem that the maintenance cost due to the periodic battery replacement and the indirect cost due to the interruption of the operation of the target system occur. In addition, when the DAQ system 110 and the battery 130 of the catenary condition monitoring system are mounted on the movable bracket 101 as in the case of FIG. 1, there is a limitation in the support load of the movable bracket 101, No, you need more frequent replacement.

In order to reduce the cost, the battery may be charged using an auxiliary power source such as a solar cell. However, using an auxiliary power source such as a solar cell can slow down the replacement cycle of the battery, but it is inappropriate for a stable power supply because the solar cell is affected by the uncontrollable factors such as the seasonal factors. In addition, in order to obtain a power of several tens W or more, the required size of the solar collecting plate 140 should be several m 2, which is often not applicable.

Therefore, in order to minimize maintenance and repair costs, it is necessary to provide a device capable of supplying power to the system for monitoring the condition of the cable line.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless power transmission device capable of achieving maximum transmission efficiency and control stability by using a wireless power transmission device for transmitting electric power to a state monitoring system of a catenary. And a method and an apparatus for performing the method.

According to an aspect of the present invention, there is provided a method of designing a transmission coil and a designing device for designing a reception coil of a wireless power transmission apparatus for transmitting power to a state monitoring system of a catenary, Calculating a transmission efficiency and a control stability when the transmission coil and the reception coil have an inductance value in the possible design area, calculating a transmission efficiency of the transmission coil and the reception coil inductance, , And comparing the calculated transmission efficiencies to find a combination having the maximum transmission efficiency while satisfying the control stability.

Here, the step of calculating whether the control coil satisfies the control stability and the transmission efficiency when the transmission coil and the reception coil have an inductance value in the possible design area includes the steps of inserting a grid into the possible design area, And calculating the transmission efficiency and satisfaction of control stability when the inductance value corresponding to the grid point is obtained.

The basic information may include a maximum value of a voltage / current applied to the transmission coil and a maximum value of a voltage / current applied to the reception coil. In addition, the basic information may include an operating frequency, a transmission power range, a coil loop diameter, .

The step of finding a possible design region of the transmission coil and the reception coil inductance may be a region that satisfies all of the inequalities (4a), (4b), and (4c) below as a possible design region.

Figure 112015102365467-pat00001

here,

Figure 112015102365467-pat00002
Output power,
Figure 112015102365467-pat00003
The load resistance,
Figure 112015102365467-pat00004
Is the coupling coefficient,
Figure 112015102365467-pat00005
Means a current flowing in the receiving coil.

And calculating the transmission efficiency and the satisfaction of the control stability when the transmission coil and the reception coil have the inductance value in the possible design area, the following equation can be used to calculate the transmission efficiency [theta].

Figure 112015102365467-pat00006

Where Q TX and Q RX denote the degree of self-sufficiency of the receiving coil and Q p , respectively, and Q p and Q s denote the degree of goodness including the load on the transmitting coil and the receiving coil, respectively.

In addition, the step of calculating the satisfaction of the control stability and the transmission efficiency when the transmission coil and the reception coil have the inductance value in the possible design area can be determined by satisfying the control stability using the following equation.

Figure 112015102365467-pat00007

Where k is the coupling coefficient,

Figure 112015102365467-pat00008
: Operation angular frequency, SS, SP, PS, and PP denote the resonance modes of the transmission coil and the reception coil, where S or P denotes a series or parallel resonance of the transmission coil, S or P of the reception coil means a series or parallel resonance of the reception coil.

According to another aspect of the present invention for solving the above problems, a transmission coil of a wireless power transmission apparatus for transmitting electric power to a state monitoring system of a catenary line, and a designing apparatus for designing a reception coil, Calculating an effective design area of the transmit coil and the receive coil inductance to calculate a control stability satisfaction and transmission efficiency when the transmit coil and the receive coil have inductance values in the possible design area, A designing unit for deriving a structure of the transmission coil and the reception coil having a maximum transmission efficiency while satisfying the control stability by comparing the transmission efficiencies, and a display unit for displaying the results derived from the designing unit.

Here, the structure of the transmission coil and the reception coil may include inductance, diameter, and number of turns of each coil.

According to another aspect of the present invention, there is provided a wireless power transmission apparatus for transmitting power to a state monitoring system of a catenary includes a transmission coil having an inductance of 2 uH to 12 uH, And a power receiving unit including a receiving coil having an inductance of 10 uH to 30 uH and receiving power from the magnetic field emitted from the power transmitting unit. More preferably, the inductance of the transmission coil may be 4.8 uH, and the inductance of the reception coil may be 16.5 uH.

In relation to the coil structure, the transmission coil and the reception coil may be circular coils having a diameter of 30 cm to 40 cm, and the number of turns may be 3 to 6. More preferably, the transmitting coil is a circular coil having a diameter of 40 cm, the number of turns is 3, the receiving coil is a circular coil having a diameter of 40 cm, and the number of turns is 6.

In addition, the wireless power transmission apparatus includes an inverter unit installed on the ground to receive AC power of a commercial frequency, convert the AC power into high frequency AC power used in power transmission, and supply the AC power to the power transmission unit, And may further include a charging unit for converting the power. The AC power of the high frequency may be 6.78 MHz.

According to the installation situation, it is possible to reduce the maintenance and repair cost of the system by supplying electric power to the electric line condition monitoring system using the wireless power transmission device designed to have the maximum transmission efficiency.

FIG. 1 is a view showing a state monitoring system installed in a conventional electric railway line.
2 is a configuration diagram of a wireless power transmission apparatus for supplying power to a catenary line status monitoring system according to an embodiment of the present invention.
3 is an installation schematic diagram of a wireless power transmission apparatus according to an embodiment of the present invention.
4 is a diagram illustrating a design method for determining the inductance of a transmission coil and a reception coil of a wireless power transmission apparatus having maximum transmission efficiency and control stability according to an embodiment of the present invention.
FIGS. 5A through 5C are diagrams illustrating a process of finding a possible design region according to an exemplary embodiment of the present invention.
FIG. 6 is a diagram illustrating insertion of 20 x 20 grids into a possible design area according to an embodiment of the present invention.
7 is a block diagram of an apparatus for designing a wireless power transmission apparatus according to an embodiment of the present invention.
8A and 8B are diagrams illustrating a method of designing a wireless power transmission apparatus with a working frequency of 6.78 MHz, a transmission power of 100 W, a parameter of a transmitting coil and a receiving coil of 40 cm or less in diameter at a distance of 1 m according to an exemplary embodiment of the present invention And a drawing showing a possible design area when a grid is inserted.
9A to 9C are views showing models and simulation results for simulating the designed wireless power transmission system using finite element analysis.

In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention.

Although the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But should be understood to include all modifications, equivalents, and alternatives.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

FIG. 2 is a configuration diagram of a wireless power transmission apparatus for supplying power to a catenary line status monitoring system according to an embodiment of the present invention, and FIG. 3 is a schematic view of an installation of a wireless power transmission apparatus according to an embodiment of the present invention.

2, the wireless power transmission apparatus includes an inverter unit 210, a power transmitting unit 220, a power receiving unit 230, and a charging unit 240. The inverter unit 210 is a device installed on the ground, and receives AC power of a frequency from the ground and converts it into AC power of high frequency used in power transmission. As an example, it performs a function of generating a high frequency AC power of 6.78 MHz from a commercial power source of 60 Hz. The converted high frequency AC power is transmitted to the power transmission unit 220 installed on the main body of the wired line 250.

The power transmission unit 220 includes a transmission coil 221 and receives the power transmitted from the inverter unit 210 to generate and discharge a magnetic field. The generated magnetic field at this time may have the same frequency as the high frequency current flowing in the transmission coil 221. The power transmission unit 220 may be installed at an upper portion of a telephone pole where no voltage is applied.

The power receiving unit 230 receives the high frequency AC power from the magnetic field emitted from the power transmitting unit 220, including the receiving coil 231. More specifically, a voltage / current is induced in the receiving coil 231 by a magnetic field varying with the generated time, and the high frequency AC power can be received using the voltage / current. The power receiving unit 230 may be installed in the movable bracket 101 through which a high voltage of 25 kV flows. The power received by the power receiving unit 230 is transmitted to the charger 240 and is re-converted to a DC voltage, and can be continuously supplied to the catenary condition monitoring system even when used for battery charging or without a battery.

There are two major considerations in designing such a wireless power transmission device. First is power transmission efficiency. The transmission efficiency [theta] can be expressed by the following equation (1).

Figure 112015102365467-pat00009

here

Figure 112017005046658-pat00010
,
Figure 112017005046658-pat00011
Is a self-quality factor of the transmitting coil 221 and the receiving coil 231
Figure 112017005046658-pat00012
,
Figure 112017005046658-pat00013
. At this time
Figure 112017005046658-pat00014
And, f is the operating frequency, L TX, L RX are each transmit coil 221 and receive self-inductance (Self-inductance), R TX, R RX coil 231, a transmission coil 221 and the receiving coil, respectively ( 231). Also, Q p and Q s are good degrees including the loads of the transmission coil 221 and the reception coil 231, which indicate the degree of goodness of the system including the load. Q p , Q s, when the receiving coil 231 is a parallel resonance,
Figure 112017005046658-pat00015
,
Figure 112017005046658-pat00016
, Where R L is the equivalent load resistance
Figure 112017005046658-pat00017
Means a transmission ratio between the transmission coil 221 and the reception coil 231
Figure 112017005046658-pat00018
, And k is the coupling coefficient.
Figure 112017005046658-pat00019
Where M is the mutual inductance between L TX and L RX . If the receiving coil 231 is a series resonance,
Figure 112017005046658-pat00020
,
Figure 112017005046658-pat00021
As shown in FIG.

As can be seen from Equation (1), the transmission efficiency of the entire system

Figure 112015102365467-pat00022
) Decreases as Q p and Q s decrease, and Q TX and Q RX The better. Q TX , Q RX Is the ratio of the loss of the coil itself to the inductance thereof, and thus represents the loss characteristic of the coil itself. Therefore, it is important to produce coils with small losses. Further, Q p , Q s Indicates the ratio of the reactance of the load to the reactance of the coil. The smaller the Q p and the Q s , the larger the load is compared with the reactance. In this case, the efficiency is improved because the power is transmitted to the load side more. Q p and Q s include k or M in the denominator of the equation. As k or M increases (ie, the power transmission distance decreases or the coil size increases), the values of Q p and Q s decrease Efficiency can be improved.

In summary, the transmission efficiency of a wireless power transmission device is affected by the power transmission distance, coil size, number of turns, coil inductance, loss, load value, and the like. Here, the number of turns indicates how many times the wire is wound round in the circular coil. Therefore, it is necessary to find the appropriate coil shape according to the transmission distance and the load value to obtain the maximum transmission efficiency.

Second, control stability must be checked in the design of resonant wireless power transmission devices. If a proper relationship between the coil impedance and the load is not achieved, the resonance pole of the transmission coil 221 and the resonance pole of the reception coil 231 become close to each other as the load value fluctuates, Bifurcation control may become unstable. If the control stability condition is broken, a plurality of resonance frequencies are visible on the transmission coil 221 side of the wireless power transmission apparatus, and the reception coil 231 can not operate in accordance with the resonance frequency of the transmission coil 221, Can not be obtained. Equation (2) shows the equations that must be followed to satisfy the control stability to the resonance type.

Figure 112015102365467-pat00023

Where S is a coupling coefficient and SS, SP, PS, PP and the like represent the resonance type of the transmitting coil 221 and the receiving coil 231. The S or P is a series or parallel of the transmitting coil 221 (Parallel) resonance, and the backward S or P means a series or parallel resonance of the receiving coil 231. [

4 is a diagram illustrating a design method for determining the inductance of the transmission coil 221 and the reception coil 231 of the wireless power transmission apparatus having the maximum transmission efficiency and the control stability according to an embodiment of the present invention.

Referring to FIG. 4, in order to design a wireless power transmission apparatus having maximum transmission efficiency and control stability, a wireless power transmission apparatus design apparatus must acquire basic information for designing (S410). The basic information may include parameters that must be basically constrained to install the wireless power transmission in the catenary, as shown in Table 1 below.

parameter value Operating frequency 6.78MHz Transmit power 15W or more and 150W or less Coil wire conductor diameter 6mm or less Transmission distance 60cm ~ 1m

In addition to the above parameters, a voltage / current applied to the transmission coil 221 and a maximum value of a voltage / current applied to the reception coil 231 are required at the time of designing. Next, the wireless power transmission apparatus designing apparatus searches for the inductance (L TX ) of the transmission coil 221 and the feasible design space on the inductance (L RX ) plane of the reception coil 231 in correspondence with the basic information (S420). The possible design range may be a range of inductance values that the transmission coil 221 and the reception coil 231 can have while satisfying the initial information.

FIGS. 5A through 5C are diagrams illustrating a process of finding a possible design region according to an exemplary embodiment of the present invention.

5A to 5C, the voltage / current applied to the transmission coil 221 input as initial information and the maximum value of the voltage / current applied to the reception coil 231

Figure 112015102365467-pat00024
,
Figure 112015102365467-pat00025
,
Figure 112015102365467-pat00026
,
Figure 112015102365467-pat00027
, The reactances X TX and X RX of the transmission coil 221 and the reception coil 231 must satisfy the following formula (3). In other words, a region that satisfies all three inequalities of Equation (3) can be a possible design region.

Figure 112015102365467-pat00028

here,

Figure 112015102365467-pat00029
Output power,
Figure 112015102365467-pat00030
The load resistance,
Figure 112015102365467-pat00031
Is the coupling coefficient,
Figure 112015102365467-pat00032
Means a current flowing in the receiving coil. Here, k, P out , R L, and the like are constants when the power transmission distance and the output power amount, the output voltage, the voltage / current applied to the transmission coil 221, and the maximum value of the voltage / current applied to the reception coil 231 are determined X TX , and X RX . Equation (3a) indicates that the voltage applied to the transmission coil 221 is
Figure 112015102365467-pat00033
To be smaller, X TX must be set to X RX Lt; RTI ID = 0.0 > X TX < / RTI > A is the y-axis corresponds to time quadrature drew on a plane, the lower part 510 of the straight line having the slope of the amount as shown in Figure 5a to the RX X in the x-axis. The same X TX FIG region satisfying the equation (3b) and (3c) And X RX And if an area by three inequalities is displayed, it can be displayed as shown in FIG. 5B. Therefore, the reactance values of the transmission coil 221 and the reception coil 231 can be selected as the values existing in the intersection area 520 of FIG. 5B. If such an intersection area exists, this can be referred to as a possible design area. If the operating frequency (6.78 MHz according to Table 1 above) is fixed, X TX and X RX Can be divided by the operating frequency. In this case, the possible design range can be expressed by the following equation (4).

Figure 112015102365467-pat00034

As shown in FIG. 5C, it can be displayed on the plane of L TX and L RX as shown in FIG. 5C. The inductance values of the transmission coil 221 and the reception coil 231 can be selected as a combination of values in the possible design area 530 determined by the above equation (4).

Referring again to FIG. 4, in order to determine the inductance values of the transmission coil 221 and the reception coil 231 having the maximum transmission efficiency and the control stability, the radio power transmission device design apparatus includes N x M grids (S430).

FIG. 6 is a diagram illustrating insertion of 20 x 20 grids into a possible design area according to an embodiment of the present invention.

6, the inductance of the transmitting coil 221 and the inductance of the receiving coil 231 may have arbitrary values in the possible design area. However, in order to calculate the efficiency, a grid is inserted for each axis, It is possible to examine the transmission efficiency and the control stability using only the L TX and L RX values at the point of intersection. The interval of the grid for each axis may be set to an arbitrary value. As the grid spacing becomes smaller, more computation becomes possible while more accurate calculations can be made. The larger the grid spacing, the less accurate the computation amount may be.

4, the apparatus for designing a wireless power transmission apparatus determines the diameter and the number of turns of the coil having the inductance values of the transmission coil 221 and the reception coil 231 at the respective grid points, (S440). The diameter and the number of turns of the coil that can be used can be determined by the given initial information, and the efficiency and the control stability can be calculated using the above-mentioned equations (1) and (2).

More specifically, the diameter and the number of turns of the transmission coil 221 and the reception coil 231 that satisfy the inductance values of the transmission coil 221 and the reception coil 231 in the selected grid are determined (S441). At this time, in determining the diameter and the number of turns, the given initial information may be constrained, and combinations of a plurality of diameters and number of turns may be determined.

Then, the loss due to the resistance is calculated for the combination of the determined diameter and the number of turns (S443), and the coupling coefficient calculation (S445) is also calculated. Using this, the transmission efficiency and the control stability satisfaction that can be obtained for each combination of diameter and number of turns at each grid point are calculated (S447) using Equations (1) and (2). The above steps S441 to S447 may be performed on the inductance values of the transmission coil 221 and the reception coil 231 of all the grid points. Then, by comparing the transmission efficiency at each grid point, a combination having the maximum efficiency while satisfying the control stability is searched (S450).

By using the method of FIG. 4, it is possible to design a wireless power transmission apparatus having the maximum efficiency while satisfying control stability.

7 is a block diagram of an apparatus for designing a wireless power transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 7, the designing apparatus for designing a wireless power transmission apparatus for a catenary may include an input unit 710, a design unit 720, and a display unit 730.

The input unit 710 of the design apparatus can obtain basic information for designing. The basic information may be input by a user or may be provided with communication means to receive basic information through communication with an external input means.

Based on the basic information received from the input unit 710, the design unit 720 calculates the inductance of the transmission coil 221 having the highest transmission efficiency and the transmission coil 221 having the control stability according to the design method of FIG. 4, And the structure of the transmitting coil 221 and the receiving coil 231 including the diameter and the number of turns are derived.

The display unit 730 has a screen capable of displaying the result of the design unit 720 or a communication means capable of communicating with the external display device to display the result of the design unit. At this time, the simulation result may be displayed together with the basic information and the design result, or may be displayed for each combination when the plurality of combinations exhibit the same transmission efficiency.

8A and 8B are diagrams illustrating an example of a method according to an embodiment of the present invention in which a working frequency of 6.78 MHz, a transmission power of 100 W, a transmission coil 221 and a receiving coil 231 having a diameter of 40 cm or less A diagram showing a possible design area when designing a wireless power transmission apparatus and a diagram in which a grid is inserted.

Referring to the design method of FIG. 4, the design apparatus first acquires basic information by using the input unit. Basic information can be summarized as [Table 2].

Design parameters value Operating frequency 6.78MHz Transmit power 100W Transmission distance 1m Coil wire conductor diameter 6mm or less The maximum voltage applied to the transmission coil 221 5000V The maximum value of the current applied to the transmission coil 221 30A The maximum value of the voltage applied to the receiving coil 231 5000V The maximum value of the current applied to the receiving coil 23 5A

FIG. 8A shows the result of obtaining the possible design area 810 using [Equation 3] and [Equation 4] based on the basic information in [Table 2].

Referring to FIG. 8A, the inductance of the transmission coil 221 corresponding to the possible design range is in the range of 2 to 12 uH, and the inductance of the reception coil 231 is in the range of 10 to 30 uH. Where uH means 10 -6 H. In order to satisfy the above-described inductance range, the number of rotations that the transmission coil 221 and the reception coil 231 can have, that is, Is 3 to 6.

FIG. 8B shows that the obtained designable area is inserted with 20 grids in the inductance (L TX ) axis of the transmission coil 221 and 20 grids in the inductance (L RX ) axis of the reception coil 231. 4, the inductance L TX of the transmission coil 221 is 4.8 uH (diameter 40 cm, three turns), and the inductance L RX of the reception coil 231 is 16.5 uH (diameter 40 cm) , 6 turns), the maximum transmission efficiency and control stability can be secured.

FIGS. 9A to 9C are views showing models and simulation results for simulating the designed wireless power transmission system using finite element analysis. FIG.

Referring to FIG. 9A, in the simulation model, as designed in the design apparatus, the transmission coil 221 has three turns at a diameter of 40 cm, the reception coil 231 has six turns at a diameter of 40 cm, . The resultant input impedance magnitude and phase when finite element analysis is used to simulate the model of FIG. 9A are shown in FIG. 9B and the power transmission efficiency by frequency is shown in FIG. 9C. Referring to FIGS. 9B and 9C, it can be seen that the input impedance is minimized at the operating frequency of 6.78 MHz and the power transmission efficiency is maximized.

It can be confirmed that the apparatus for designing a catenary wireless power transmission system proposed by the present invention works correctly when referring to the simulation results and the like. By setting basic information according to characteristics of a place where the wireless power transmission system can be placed, Lt; RTI ID = 0.0 > a < / RTI >

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (16)

A method of designing a transmission coil and a designing device for designing a reception coil of a wireless power transmission apparatus for transmitting electric power to a state monitoring system of a catenary,
Obtaining basic information for designing;
Finding possible design areas of the transmit coil and receive coil inductance;
Calculating a control stability satisfaction and transmission efficiency when the transmission coil and the reception coil have an inductance value in the possible design area; And
Comparing the calculated transmission efficiency to find a combination having a maximum transmission efficiency while satisfying control stability;
Wherein the transmit coil and receive coil design method of the wireless power transmission device comprises: The method according to claim 1,
Wherein the step of calculating the control stability satisfaction and the transmission efficiency when the transmission coil and the reception coil have inductance values in the possible design area
Inserting a grid into the possible design area; And
Calculating a control stability satisfaction and a transmission efficiency when the transmission coil and the reception coil have an inductance value corresponding to each point where the grid meets the grid;
Wherein the transmit coil and receive coil design method of the wireless power transmission device comprises: The information processing apparatus according to claim 1,
A maximum value of a voltage and a current to be applied to the transmission coil, and a maximum value of a voltage and a current to be applied to the reception coil,
Method of designing transmit coil and receive coil of a wireless power transmission device. 4. The method according to claim 3,
Further comprising an operating frequency, a range of transmit power, a coil loop diameter, and a transmission distance,
Method of designing transmit coil and receive coil of a wireless power transmission device. The method according to claim 1,
The step of finding a possible design region of the transmission coil and the reception coil inductance includes a step of designating an area satisfying all of the inequalities (4a), (4b), and (4c)
Method of designing transmit coil and receive coil of a wireless power transmission device.
Figure 112017005046658-pat00035

Where L TX is the self inductance of the transmitting coil, L RX is the self inductance of the receiving coil,
Figure 112017005046658-pat00058
Is the maximum value of the voltage applied to the transmission coil,
Figure 112017005046658-pat00059
The maximum value of the current flowing through the transmission coil,
Figure 112017005046658-pat00060
Is the maximum value of the voltage applied to the receiving coil,
Figure 112017005046658-pat00061
Output power,
Figure 112017005046658-pat00062
The load resistance,
Figure 112017005046658-pat00063
Is the coupling coefficient,
Figure 112017005046658-pat00064
Is a current flowing in the receiving coil. The method according to claim 1,
Wherein the step of calculating the control stability satisfaction and the transmission efficiency when the transmission coil and the reception coil have inductance values in the possible design area
Transmission Efficiency (
Figure 112015102365467-pat00040
) ≪ / RTI > using the following equation: < RTI ID =
Method of designing transmit coil and receive coil of a wireless power transmission device.
Figure 112015102365467-pat00041

Q TX and Q RX : self-sufficiency of transmit coil and receive coil, respectively
Q p , and Q s are the degrees of goodness including the load on the transmitting coil and the receiving coil, respectively The method according to claim 1,
Wherein the step of calculating the control stability satisfaction and the transmission efficiency when the transmission coil and the reception coil have inductance values in the possible design area
Determining whether the control stability is satisfied using the following equation: < EMI ID =
Method of designing transmit coil and receive coil of a wireless power transmission device.
Figure 112017005046658-pat00042

Where k is the coupling coefficient,
Figure 112017005046658-pat00043
L RX is the self-inductance of the receiving coil,
Figure 112017005046658-pat00065
SS, SP, PS, and PP denote the resonance modes of the transmission coil and the reception coil, where S or P denotes a series or parallel resonance of the transmission coil, S or P of the reception coil means a series or parallel resonance of the reception coil. A design apparatus for designing a transmission coil and a reception coil of a wireless power transmission apparatus for transmitting electric power to a state monitoring system of a catenary,
An input unit for acquiring basic information for designing;
Calculating a possible design area of the transmission coil and the reception coil inductance and calculating a control stability satisfaction and transmission efficiency when the transmission coil and the reception coil have an inductance value in the possible design area and comparing the calculated transmission efficiency A design section for deriving the structure of the transmission coil and the reception coil with the maximum transmission efficiency while satisfying the control stability; And
A display unit for displaying a result derived from the designing unit;
And a transmitting coil and a receiving coil designing device of the wireless power transmission device. 9. The method of claim 8,
The structure of the transmission coil and the reception coil includes the inductance, the diameter, and the number of turns of each coil.
Transmit coil and receive coil design device of a wireless power transmission device.

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