KR101269226B1 - Loop type EMF shielding apparatus comprising automatic controller, power supply and pick-up including the loop type EMF shielding apparatus, and EMF shielding method by using the loop type EMF shielding apparatus - Google Patents

Abstract

The present invention relates to an electromagnetic wave shielding device of a loop type having an automatic control device, a power feeding device and a current collecting device having the same, and an electromagnetic shielding method using a loop, and more particularly, a capacitance of a capacitor connected to a loop. The present invention relates to an electromagnetic wave shielding device having a loop type, and a power feeding device and a current collecting device having the same, and an electromagnetic shielding method using a loop.
According to the present invention, in a wireless power transmission device in which a magnetic field generated by a relative position is changed by movement, such as a power supply device embedded in a road surface and a current collector installed in a vehicle, the capacitance of a capacitor connected to the electromagnetic shielding loop ( capacitance) can be automatically controlled to achieve optimum shielding conditions.

Description

Loop type electromagnetic shielding device having an automatic control device, a power feeding device and a current collector, and an electromagnetic shielding method using a loop {Loop type EMF shielding apparatus comprising automatic controller, power supply and pick-up including the loop type EMF shielding apparatus, and EMF shielding method by using the loop type EMF shielding apparatus}

The present invention relates to an electromagnetic wave shielding device of a loop type having an automatic control device, a power feeding device and a current collecting device having the same, and an electromagnetic shielding method using a loop, and more particularly, a capacitance of a capacitor connected to a loop. The present invention relates to an electromagnetic wave shielding device having a loop type, and a power feeding device and a current collecting device having the same, and an electromagnetic shielding method using a loop.

Power of devices that drive and operate electricity as a power source, such as electronic devices, medical devices, electric vehicles, and electric vehicles, has been transmitted using power lines. However, the use of such power lines has impeded the mobility of the device or accompanied positional constraints. Therefore, to overcome this problem, wireless power transmission apparatuses such as electromagnetic induction, frequency resonance, and radiation have been developed.

The wireless power transmitter transmits power by using electromagnetic induction, magnetic resonance, and radiation properties between the RF band transmitting and receiving antennas, thereby generating high electromagnetic waves. These electromagnetic waves can affect the malfunction of the electronic device and the human body, and the laws of each country regulate the intensity of electromagnetic waves by regulating the intensity of the generated magnetic or electric fields. For the electromagnetic shielding, a loop type electromagnetic shielding device that can shield the magnetic field using induction current at high frequency is proposed by forming a loop by connecting a capacitor in series at both ends of the metal wire and applying it to the electromagnetic shielding. It became.

However, when the roof type electromagnetic shielding device is used in a moving device such as a vehicle, there is a problem that it is difficult to continuously maintain the optimum operating position of the roof shielding device during the movement.

The present invention was devised to solve such a problem, and in a wireless power transmission device in which a magnetic field generated by a change in relative position also changes with movement, such as a power supply device embedded in a road surface and a current collector installed in a vehicle. Another object of the present invention is to provide a loop type electromagnetic shielding device capable of automatically controlling the capacitance of a capacitor connected to a loop to be an optimal shielding condition.

에서

인 경우의 차폐코일의 임피던스를 의미하며,

이고, f는 주파수, L은 차폐코일의 인덕턴스, R은 차폐코일의 저항, C는 커패시터 어레이의 커패시턴스, Z는 차폐코일의 임피던스를 의미한다.In order to achieve the above object, according to the present invention, an apparatus for shielding electromagnetic waves, the shielding coil of the loop type provided in the electromagnetic wave generating portion of the electric device; A capacitor array comprising two or more capacitors installed at a specific position of the shielding coil to apply a low impedance to the shielding coil; And a switch array composed of switches connected to each capacitor so as to adjust capacitance by presetting each capacitor of the capacitor array in advance.

in

In case of means the impedance of shielding coil,

Where f is frequency, L is inductance of shielding coil, R is resistance of shielding coil, C is capacitance of capacitor array, and Z is impedance of shielding coil.

에서

인 경우의 차폐코일의 임피던스를 의미하며,

이고, f는 주파수, L은 차폐코일의 인덕턴스, R은 차폐코일의 저항, C는 커패시터 어레이의 커패시턴스, Z는 차폐코일의 임피던스를 의미한다.According to another aspect of the present invention, a power feeding device having an electromagnetic shielding function for supplying power to the moving body in a magnetic induction method, the power supply coil receives a power from the inverter, the current flows for generating a magnetic field; A feeding core having a magnetic pole for delivering a magnetic field generated by the feeding coil current to a current collector; A shielding coil having a loop shape installed at an electromagnetic wave generating portion of the feeding core; A capacitor array comprising two or more capacitors installed at a specific position of the shielding coil to apply a low impedance to the shielding coil; And a switch array composed of switches connected to each capacitor so as to adjust capacitance by presetting each capacitor of the capacitor array in advance.

in

In case of means the impedance of shielding coil,

Where f is frequency, L is inductance of shielding coil, R is resistance of shielding coil, C is capacitance of capacitor array, and Z is impedance of shielding coil.

에서

인 경우의 차폐코일의 임피던스를 의미하며,

이고, f는 주파수, L은 차폐코일의 인덕턴스, R은 차폐코일의 저항, C는 커패시터 어레이의 커패시턴스, Z는 차폐코일의 임피던스를 의미한다.According to another aspect of the present invention, the current collector installed on the moving body having electromagnetic shielding function while receiving power from the power feeding device installed along the traveling path of the moving body in a magnetic induction manner, spaced apart from the power feeding device at a lower end of the moving body A current collector core, the current collector having a magnetic pole that receives the magnetic field generated by the power feeding device; A current collector coil installed in the current collector core in a loop shape and flowing current induced by the magnetic field; A shielding coil having a loop shape installed at an electromagnetic wave generating portion of the current collecting core; A capacitor array comprising two or more capacitors installed at a specific position of the shielding coil to apply a low impedance to the shielding coil; And a switch array composed of switches connected to each capacitor so as to adjust capacitance by presetting each capacitor of the capacitor array in advance.

in

In case of means the impedance of shielding coil,

Where f is frequency, L is inductance of shielding coil, R is resistance of shielding coil, C is capacitance of capacitor array, and Z is impedance of shielding coil.

According to another aspect of the present invention, an apparatus for shielding electromagnetic waves, the shielding coil of the loop type is installed in the electromagnetic wave generating portion of the electrical device; A magnetic field sensor unit detecting a magnetic field generated by the shielding coil; An EMF magnitude detector for detecting a magnetic field amplitude value from the magnetic field signal sensed by the magnetic field sensor and transferring it to a capacitance calculator; A capacitor array connected to the shielding coil in series and composed of a plurality of capacitors; A switch array comprising switches each capable of turning on and off capacitors of the capacitor array; And calculating a capacitance capable of reducing the magnetic field of the shielding coil from the magnetic field value transmitted from the EMF size sensing unit, so that the capacitance value of the capacitor array is adjusted to the calculated capacitance value. And a capacitance calculator for controlling the off.

According to still another aspect of the present invention, a power supply device having an electromagnetic shielding function for supplying power to a mobile body in a magnetic induction manner includes: a power supply coil supplied with electric power from an inverter and configured to generate a magnetic field; A feeding core having a magnetic pole for delivering a magnetic field generated by the feeding coil current to a current collector; A loop-shaped shielding coil installed at the electromagnetic wave generating portion of the power feeding device; A magnetic field sensor unit detecting a magnetic field generated by the shielding coil; An EMF magnitude detector for detecting a magnetic field amplitude value from the magnetic field signal sensed by the magnetic field sensor and transferring it to a capacitance calculator; A capacitor array connected to the shielding coil in series and composed of a plurality of capacitors; A switch array comprising switches each capable of turning on and off capacitors of the capacitor array; And calculating a capacitance capable of reducing the magnetic field of the shielding coil from the magnetic field value transmitted from the EMF size sensing unit, so that the capacitance value of the capacitor array is adjusted to the calculated capacitance value. And a capacitance calculator for controlling the off.

According to another aspect of the present invention, the current collector installed on the moving body having electromagnetic shielding function while receiving power from the power feeding device installed along the traveling path of the moving body in a magnetic induction manner, spaced apart from the power feeding device at a lower end of the moving body A current collector core, the current collector having a magnetic pole that receives the magnetic field generated by the power feeding device; A current collector coil installed in the current collector core in a loop shape and flowing current induced by the magnetic field; A loop-shaped shielding coil installed at an electromagnetic wave generating portion of the current collector; A magnetic field sensor unit detecting a magnetic field generated by the shielding coil; An EMF magnitude detector for detecting a magnetic field amplitude value from the magnetic field signal sensed by the magnetic field sensor and transferring it to a capacitance calculator; A capacitor array connected to the shielding coil in series and composed of a plurality of capacitors; A switch array comprising switches each capable of turning on and off capacitors of the capacitor array; And calculating a capacitance capable of reducing the magnetic field of the shielding coil from the magnetic field value transmitted from the EMF size sensing unit, so that the capacitance value of the capacitor array is adjusted to the calculated capacitance value. And a capacitance calculator for controlling the off.

According to another aspect of the present invention, a method for shielding electromagnetic waves, comprising: detecting and measuring a magnetic field generated in the shielding coil of the loop type installed in the electromagnetic wave generating portion of the electrical device; Converting the measured magnetic field value into a voltage value; Calculating a capacitance capable of reducing the magnetic field of the shielding coil from the converted magnetic field value; And automatically turning on and off respective capacitors of the capacitor array such that the capacitance value of the capacitor array connected in series with the shielding coil is adjusted to the calculated capacitance value.

Between step (a) and step (b), (a1) further comprises the step of converting the measured magnetic field value into a voltage value, wherein the measured magnetic field value of step (b) comprises: It may be a value converted into a voltage value in a1).

According to the present invention, in a wireless power transmission device in which a magnetic field generated by a relative position is changed by movement, such as a power supply device embedded in a road surface and a current collector installed in a vehicle, the capacitance of a capacitor connected to the electromagnetic shielding loop ( capacitance) can be automatically controlled to be the optimum shielding conditions.

1 is a view showing an electromagnetic shielding device in the form of a loop.
2 is a view showing a vehicle having a feeder road and a current collector for supplying power wirelessly;
3 is a view showing the configuration of the electromagnetic wave shielding device of the loop type having an automatic control device according to the present invention.
Figure 4 is a view showing an actual picture of the electromagnetic shielding device of the loop type capable of manually setting the capacitance according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 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 this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1 is a diagram illustrating an electromagnetic wave shielding device (hereinafter, referred to as a 'loop shielding device') 100 having a loop shape.

When the loops electrically connected to both ends of the metal wires are positioned at the site where the magnetic field is generated, when the loops penetrate, the voltage (V = dΦ / dt) is generated in the cable constituting the loop by the penetrating magnetic flux, whereby the loop Current in the direction of reducing the magnetic field passing through the cable constituting the is induced. This current is generated as the loop's impedance is lower, which significantly reduces the strength of the magnetic field. This current flows more as the impedance of the cable constituting the loop is lower.

However, the loop made as described above physically has an electrical property called inductance according to the shape of the loop and the number of rotations of the cable, and the inductance increases the impedance of the loop in proportion to the frequency as the frequency increases.

This is explained by the following equations (1) and (2).

는

(f는 주파수)를 나타낸다.Where Z is the impedance of the loop, | Z | is the magnitude of the impedance, L is the inductance of the loop, and R is the resistance of the loop.

The

(f is frequency).

Accordingly, when the high frequency magnetic field passes through the loop, the current induced by the penetrating magnetic flux becomes small, and the shielding effect of the magnetic field is significantly reduced. In order to compensate for this, the inductance must be made small by making the loop small, but in this case, the size of the loop is restricted, and the loop must be made and mounted.

In order to solve this problem, as shown in the upper portion of Figure 1 as the electromagnetic shield 100, at both ends of the metal wire, the capacitor unit 120 including one or more capacitors in series connected in series If one loop 110 is made, the impedance of the loop can be reduced. At this time, the impedance Z of the loop and the magnitude | Z | of the impedance are expressed as in Equations 3 and 4.

를 만족하는 공진주파수

에서, 루프 임피던스는 수학식 5와 같이 최소값이 된다.Here, LC series resonance is generated by the inductance of the loop 110 connected in series with the capacitance of the capacitor included in the capacitor unit 120, thereby making it possible to secure a loop having a low impedance. In other words

Resonant frequency satisfying

In the loop impedance, the minimum value is obtained as shown in Equation 5.

That is, when the size of the capacitor is properly adjusted, low impedance is obtained in a desired frequency band, that is, a frequency band of the magnetic field 20 to be cut off, which occurs in the electric device 10. Therefore, by using a capacitor having a capacitance of the appropriate size irrespective of the size of the loop 110 in the capacitor unit 120, it is possible to manufacture a loop having a high shielding effect in various frequency bands.

FIG. 150 at the bottom of FIG. 1 shows the change in impedance magnitude according to the frequency.

FIG. 2 is a diagram illustrating a vehicle provided with a power supply road and a current collector for wirelessly supplying power.

A power feeding device 210 embedded in the ground and supplying electric power in a magnetic induction manner, and a current collecting device 220 attached to the vehicle, receives power from the power supply device 210.

1, the roof shielding device as shown in FIG. 1 is attached to a vehicle that charges electricity wirelessly while moving, as shown in FIG. The magnetic field can be minimized. Such a roof shielding device may be installed at both the current leakage device and the electromagnetic leakage portion of the power supply device.

3 is a view showing the configuration of a loop shield device 100 having an automatic control device according to the present invention.

Such a roof shielding device 100 has an optimum shielding condition according to the position when attached to the vehicle separately, it is required to adjust the roof shielding device 100 according to the vehicle attachment position. This is because the strength of the magnetic field decreases as the distance from the wireless power transmission device decreases, and thus the strength of the magnetic field to be canceled by the loop shield 100 should be reduced. That is, when the loop shield device 100 is located close to the wireless power transmission device, the induced current amount of the loop shield device 100 should be large, and when the loop shield device 100 is located far from the wireless power transmission device, The quantity should be small. Therefore, control of the induced current is required according to the mounting position.

In addition, an optimal position exists for maximum power transfer between the power supply device and the current collector of the wireless power transmission device. If the deviation from the maximum power transfer position existing between the feeder and the current collector, the power transfer capacity is reduced by the deviation, thereby reducing the strength of the magnetic field generated. When the power delivery device is installed in a moving device such as a vehicle to perform power delivery, the power supply device may deviate from the optimal power delivery position, and thus the intensity of the generated electric field will continuously change. In order to change the strength of the magnetic field in this way, the control of the roof shielding device 100 is required.

For this purpose, FIG. 3 illustrates a loop shield device 100 in which the capacitor unit 120 of FIG. 1 can automatically adjust capacitance according to a changing magnetic field.

The leakage magnetic field generator 10 is a device for generating a leakage magnetic field to be shielded. In one embodiment, the electric vehicle may be a power supply device or a current collector. The leakage magnetic field generated therefrom is reduced while passing through the shielding loop 110.

However, as described above, since the magnetic field continuously changes with the movement of the vehicle, the reduced state of the leakage magnetic field in the loop 110 also changes continuously. To this end, the magnetic field sensor unit 121 detects a magnetic field generated in the shielding loop 110 and transmits the detected magnetic field signal to the EMF size detection unit 122 of the controller block. The EMF size detector 122 detects the magnitude value of the received magnetic field and transmits it to the capacitance calculator 123. At this time, the magnitude value of the measured magnetic field may be converted into a voltage value and transferred to the capacitance calculator 123.

The capacitor block includes a capacitor array 125 composed of an array of multiple capacitors and a switch array 124 including switches capable of turning on and off respective capacitors. Each capacitor may be configured to have capacitances of various sizes.

The capacitance calculator 123 calculates the capacitance of the capacitor, that is, the capacitance, which can appropriately reduce the measured magnetic field, from the received magnetic field size information. In addition, the on / off control signal of each switch of the switch array 124 is sent to control the on / off of each capacitor so that the capacitance of the capacitor array 125 becomes the calculated capacitance as described above. As a result, the leakage magnetic field of the shielding loop 110 is adjusted to an appropriate value, thereby dynamically maintaining the optimum shielding state.

On the other hand, in the case of applying a magnetic field shielding by a loop in a wireless power transmitter in which the strength of the magnetic field does not change significantly, a capacitor array composed of a plurality of capacitor arrays and switches capable of turning on and off respective capacitors are provided. An electromagnetic shielding device may be implemented using only a capacitor block including a switch array and a shielding loop. FIG. 4 shows an actual picture of a loop shielding device capable of manually setting capacitance, which does not dynamically control capacitance, but can be set to the required capacitance by a switch in advance according to environmental conditions of the wireless power transmitter. Shielded loop 401, switch array 402 and capacitor array 403 are shown.

100: roof shielding device
110: shielded loop 120: capacitor portion
121: magnetic field measurement sensor unit 122: EMF size detection unit
123: capacitance calculation unit 124: switch array
125: capacitor array
401: shield loop 402: switch array
403: capacitor array
10: electromagnetic wave generator 20: magnetic field

Claims (8)

A device for shielding electromagnetic waves,
A shielding coil of a loop type installed at an electromagnetic wave generating portion of the electric device;
A capacitor array comprising two or more capacitors installed at a specific position of the shielding coil to apply a low impedance to the shielding coil; And
A switch array composed of switches connected to each capacitor so as to adjust capacitance by presetting each capacitor of the capacitor array in advance.
Lt; / RTI >
Where the low impedance is

in

In case of means the impedance of shielding coil,

Where f is frequency, L is the inductance of the shielding coil, R is the resistance of the shielding coil, C is the capacitance of the capacitor array, and Z is the impedance of the shielding coil.
Loop type electromagnetic shielding device. A power feeding device with electromagnetic shielding function, which supplies electric power to the moving body in a magnetic induction manner,
A feeding coil supplied with electric power from an inverter and flowing a current for generating a magnetic field;
A feeding core having a magnetic pole for delivering a magnetic field generated by the feeding coil current to a current collector;
A shielding coil having a loop shape installed at an electromagnetic wave generating portion of the feeding core;
A capacitor array comprising two or more capacitors installed at a specific position of the shielding coil to apply a low impedance to the shielding coil; And
A switch array composed of switches connected to each capacitor so as to adjust capacitance by presetting each capacitor of the capacitor array in advance.
Lt; / RTI >
Where the low impedance is

in

In case of means the impedance of shielding coil,

Where f is frequency, L is the inductance of the shielding coil, R is the resistance of the shielding coil, C is the capacitance of the capacitor array, and Z is the impedance of the shielding coil.
Power feeding device with electromagnetic shielding function. A current collector installed on a movable body having electromagnetic shielding function while receiving electric power in a magnetic induction manner from a power feeding device installed along a traveling path of the movable body,
A current collector core disposed spaced apart from the power feeding device at a lower portion of the movable body and having a magnetic pole receiving a magnetic field generated from the power feeding device;
A current collector coil installed in the current collector core in a loop shape and flowing current induced by the magnetic field;
A shielding coil having a loop shape installed at an electromagnetic wave generating portion of the current collecting core;
A capacitor array comprising two or more capacitors installed at a specific position of the shielding coil to apply a low impedance to the shielding coil; And
A switch array composed of switches connected to each capacitor so as to adjust capacitance by presetting each capacitor of the capacitor array in advance.
Lt; / RTI >
Where the low impedance is

in

In case of means the impedance of shielding coil,

Where f is frequency, L is the inductance of the shielding coil, R is the resistance of the shielding coil, C is the capacitance of the capacitor array, and Z is the impedance of the shielding coil.
Current collector with electromagnetic shielding function. A device for shielding electromagnetic waves,
A shielding coil of a loop type installed at an electromagnetic wave generating portion of the electric device;
A magnetic field sensor unit detecting a magnetic field generated by the shielding coil;
An EMF magnitude detector for detecting a magnetic field amplitude value from the magnetic field signal sensed by the magnetic field sensor and transferring it to a capacitance calculator;
A capacitor array connected to the shielding coil in series and composed of a plurality of capacitors;
A switch array comprising switches each capable of turning on and off capacitors of the capacitor array; And
From the magnetic field value transmitted from the EMF size sensing unit, a capacitance capable of reducing the magnetic field of the shielding coil is calculated, so that the capacitance value of the capacitor array is adjusted to the calculated capacitance value. Capacitance calculation unit for controlling
Electromagnetic shielding device of the loop type including a. A power feeding device with electromagnetic shielding function, which supplies electric power to the moving body in a magnetic induction manner,
A feeding coil supplied with electric power from an inverter and flowing a current for generating a magnetic field;
A feeding core having a magnetic pole for delivering a magnetic field generated by the feeding coil current to a current collector;
A loop-shaped shielding coil installed at the electromagnetic wave generating portion of the power feeding device;
A magnetic field sensor unit detecting a magnetic field generated by the shielding coil;
An EMF magnitude detector for detecting a magnetic field amplitude value from the magnetic field signal sensed by the magnetic field sensor and transferring it to a capacitance calculator;
A capacitor array connected to the shielding coil in series and composed of a plurality of capacitors;
A switch array comprising switches each capable of turning on and off capacitors of the capacitor array; And
From the magnetic field value transmitted from the EMF size sensing unit, a capacitance capable of reducing the magnetic field of the shielding coil is calculated, so that the capacitance value of the capacitor array is adjusted to the calculated capacitance value. Capacitance calculation unit for controlling
Feeding device with an electromagnetic shielding function comprising a. A current collector installed on a movable body having electromagnetic shielding function while receiving electric power in a magnetic induction manner from a power feeding device installed along a traveling path of the movable body,
A current collector core disposed spaced apart from the power feeding device at a lower portion of the movable body and having a magnetic pole receiving a magnetic field generated from the power feeding device;
A current collector coil installed in the current collector core in a loop shape and flowing current induced by the magnetic field;
A loop-shaped shielding coil installed at an electromagnetic wave generating portion of the current collector;
A magnetic field sensor unit detecting a magnetic field generated by the shielding coil;
An EMF magnitude detector for detecting a magnetic field amplitude value from the magnetic field signal sensed by the magnetic field sensor and transferring it to a capacitance calculator;
A capacitor array connected to the shielding coil in series and composed of a plurality of capacitors;
A switch array comprising switches each capable of turning on and off capacitors of the capacitor array; And
From the magnetic field value transmitted from the EMF size sensing unit, a capacitance capable of reducing the magnetic field of the shielding coil is calculated, so that the capacitance value of the capacitor array is adjusted to the calculated capacitance value. Capacitance calculation unit for controlling
Current collector with an electromagnetic shielding function comprising a. As a method for shielding electromagnetic waves,
(a) detecting and measuring a magnetic field generated in a shielded coil of a loop type installed at an electromagnetic wave generating portion of an electric device;
(b) calculating a capacitance capable of reducing the magnetic field of the shielding coil from the measured magnetic field value; And
(c) automatically turning on and off respective capacitors of the capacitor array such that the capacitance value of the capacitor array connected in series with the shielding coil is adjusted to the calculated capacitance value.
Electromagnetic shielding method using a loop comprising a. The method of claim 7,
Between step (a) and step (b),
(a1) converting the measured magnetic field value into a voltage value
Further comprising:
The measured magnetic field value of step (b) is a value converted into a voltage value in step (a1).
Electromagnetic shielding method using a loop, characterized in that.

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