KR20090019308A - Led light panel providid wiht the wireless power transmission system - Google Patents

Abstract

A LED electric bulletin board including wireless power transmission device is provided to omit separate wiring distribution operation in installing an LED electric bulletin board by mounting a wireless receiving part of a wireless power transmission device inside the LED electric bulletin board. A LED electric bulletin board comprises an LED display part(11) and an LED control part(12). The LED display part displays information of various characters and image type. The LED control part controls the LED display part. An AC/DC converter converts an AC power source into a DC power source. A DC/RF converter converts the DC power source into RF(Radio Frequency) signal. An oscillator outputs the RF signal with micro wave of 1~10 GHz. An amplifier amplifies and outputs the micro wave to a specified level. A wireless transmission part(20) includes a transmission antenna(21) radiating an amplified signal. A receiving antenna(31) receives the micro wave. A filter circuit extracts the RF signal only. A RF/DC converter converts the RF signal into the DC power source. A switching part(13) is positioned between a charging part of a wireless receiving part(30) and the LED display part.

Description

LED light panel equipped with wireless power transmission device {LED light panel providid wiht the wireless power transmission system}

The present invention relates to an LED display board equipped with a wireless power transmission device, and more particularly, to include a wireless power transmission (WPT) device inside the LED display board, and is generated from the wireless power transmission device. By supplying the driving power to the controller and LED signboard with electric power, it does not perform separate wire wiring work when installing the LED signboard, providing convenience in installation, improving aesthetics by removing the wire, and charging power In the LED signboard equipped with a wireless power transmission device that can be supplied to drive power to the wireless communication equipment when the LED display board is not affected by the power outage and also controls the LED signboard using wireless communication. It is about.

Generally, LED signboard is a screen designed to express graphic screens or texts in various specifications, shapes, and colors by condensing a large number of light emitting diodes (LEDs) with very low power consumption in one case. LED signboard displaying information such as destination, LED signboard installed at a designated location on the street to display traffic information and environmental information of the road, and LED signboard installed on the outer wall of the building to display various advertisements in the form of text and images. These LED signboards can increase visual attention, which can be useful for forming a specific image or enhancing a new image by providing a continuous visual stimulus to a specific large number of people in a certain place outdoors for a certain period of time. It is used as a means of communication.

In particular, the moving picture LED display is a media that enables a very wide range of access to the majority of audiences due to the high level of exposure, which can effectively bring awareness and distressing visibility to the audience, strengthen the brand image, It has the effect of recalling attention.

The LED signboard as described above operates as a direct current (DC) power source, and converts AC power into a DC power source to supply the driving power of the LED signboard, but as the driving power is supplied through a wire, the LED signboard According to the installation location of the wiring work is not only cumbersome, as well as aesthetics due to the exposure of the wire is deteriorated, there is a problem that the LED sign is not turned on during power failure.

In particular, when an LED signboard is installed at a long distance, a device for wirelessly controlling the LED signboard using wireless communication has been proposed. In this case, a receiver of a wireless communication device embedded in the LED signboard installed at a long distance may continuously operate. You will need a device that supplies power.

The present invention incorporates a wireless receiving unit of a wireless power transmission device inside the LED display board, and supplies electric power to the LED display board and the wireless communication equipment with the power generated from the wireless power transmission device, thereby providing a separate wire when the LED display board is installed. Not only does not perform wiring work, but also provides convenience for installation, and improves aesthetics due to the removal of electric wires. In order to control the LED signboard, it is a technical problem to continuously supply the driving power to the wireless communication equipment.

The present invention is a LED display unit for displaying information in the form of various characters and images, and an LED display board consisting of an LED control unit for controlling the LED display unit, AC / DC converter for converting AC power to DC power, converted DC power To convert the RF signal into an RF signal, an oscillator carrying the converted RF signal in a microwave of 1 to 10 GHz, an amplifier for amplifying and outputting the microwave carrying the RF signal to a predetermined level, and converting the amplified signal into a space. A wireless power transmission unit comprising a radiating transmission antenna, a power receiving antenna for receiving microwaves carrying RF signals in a band of 1 to 10 GHz radiated from the transmission antennas of the wireless transmission unit, and a filter circuit for extracting only RF signals carried in microwaves, the extraction. RF / DC converter for converting the converted RF signal into a DC power source, a wireless number consisting of a charging unit for charging the DC power A conventional wireless power transmission device including a unit is provided, and a wireless receiving unit constituting the wireless power transmission unit is incorporated in the LED display board, and a charging unit output terminal of the wireless receiving unit is connected to the control unit as a driving power source. And a switching unit between the charging unit of the wireless receiving unit and the LED display unit to be turned on and off by a control signal of the controller to supply charging power of the charging unit to the LED display unit.

The present invention has a built-in wireless receiving unit of the wireless power transmission device in the LED display board to improve the visibility of the various information provided by the lighting and turning off of the LED, the LED display board and the wireless communication equipment with the power generated from the wireless power transmission device By supplying the driving power to the LED board, it does not perform separate wire wiring work when installing the LED signboard, providing convenience in installation, and improving aesthetics due to the removal of the wire, and charging power to the charging unit for use. According to the power outage situation, and also to control the LED sign using wireless communication has the effect that can continuously supply the driving power to the wireless communication equipment.

Hereinafter, the LED display board with a wireless power transmission apparatus according to the present invention will be described in detail by the accompanying drawings.

First, the wireless power transmission apparatus applied to the present invention will be described.

Globally, the energy dependence on oil is about 63% and coal is 27%, which makes 90% dependence on fossil fuels, but fossil fuels not only produce carbon dioxide during combustion, but also cause air pollution. Because of this limitation, one of several alternative energy sources, the Solar Power Satelites system, is emerging.

The space photovoltaic power generation system converts DC voltage generated by solar panels installed in outer space into RF (Radio Frequency) power to transmit to the earth, and converts RF power into DC voltage in the earth. Since the proposal by Dr. Peter Glaser of the United States in 1968, it has been steadily being researched around the world, and some technologies are commercialized. Applications include low orbit satellite power supply (satellite life extension) and stationary aircraft power supply ( City surveillance, wireless relay, etc.), space photovoltaic power transmission, remote wireless power transmission (remote island, unmanned lighthouse, etc.) are infinite.

The principle of wireless power transfer This is a new concept of power transmission method that delivers electric power energy to microwave that is advantageous for wireless transmission. It is a principle of electric wave transmission that can transmit electric energy through space without wires. Signal concept used in wireless communication method such as radio or wireless telephone. If the normal communication is to send a signal to a carrier signal instead of sending electric energy, the wireless power transmission only sends a carrier wave, and the electric energy has amplitude and frequency. That has the nature of RF propagation.

In the US, Skyset Communications Corporation succeeded in free flight for six months with a 37m-long wireless power receiver wing over 20km, and Japan in 1995 was able to transmit 50KW of power at 40m altitude. ETHER: Energy Transmission to a High Alrirude Long Endurance Airship Experiment (PET) plan has been tested and will be available from NASA on October 26, 1997, from 200 to 400 MW over 12,000 km from the Sun Tower project. The company has reported a technology development plan to make the space development project within 20 years to send a Solar Disk that can transmit 5GW of power from a higher location. We are promoting a commercialization project of 300KW class with the same concept. In addition, we are conducting R & D in the European Union. It is already commercialized by being applied to electronic systems such as communication devices that can be driven with low power.

The present invention is to install the wireless receiving unit of the wireless power transmission device as described above in the LED display board to supply the driving power by the wireless power transmission device without performing a separate wire wiring operation, see Figs. When described in detail as follows.

1 is a block diagram of an LED display board equipped with a wireless power transmission apparatus according to the present invention, the LED display unit 11 for displaying information in the form of various characters and images, and LED to control the LED display unit 11 LED display panel 10 is provided as a control unit 12, the LED display unit 11 and the control unit 12 is a wireless power transmission unit 50 consisting of a wireless power transmission unit 20 and a wireless power receiving unit 30. It is driven by a DC power supply supplied from.

The wireless receiving unit 30 is built in the LED display board 10, the wireless receiving unit 30 receives the RF radio wave transmitted from the wireless transmission unit 20 to output the DC power, this output power is At the same time as the driving power to the control unit 12 is supplied to the lighting power of the LED display unit 11 through the switching unit 13 is turned on and off by the control unit 12.

FIG. 2 is a block diagram of a wireless power transmitter 50, which is applied to the present invention and includes a wireless power transmitter 20 and a wireless power receiver 30. The wireless power transmitter 20 converts AC power into DC power. An AC / DC converter 22 is provided, and an output terminal of the AC / DC converter 22 is connected to a DC / RF converter 23 for converting and outputting a DC power source into an RF signal. An oscillator 24 is connected to an output terminal of the oscillator 24 for outputting an RF signal to a microwave of 1 to 10 GHz, and an amplifier 24 for power amplifying and outputting microwaves at a predetermined level is connected to an output terminal of the oscillator 24. In addition, a transmission antenna 21 for radiating microwaves carrying RF signals into space is connected to an output terminal of the amplifier 24.

In the wireless power transmitter 50 applied to the present invention, the first consideration should be the frequency selection of the RF signal. In general, the spatial transmission characteristics of electromagnetic waves increase in proportion to frequency, and there is also a loss of atmospheric noise due to the reflection of the earth. Therefore, the selection of the most stable frequency band should be considered first.

That is, the most lossy frequency bands of the spatial transmission characteristics of the electromagnetic waves in the standby state are 10 to 300 MHz and 20 to 60 GHz band, so the RF output signal of the DC / RF converter 23 used in the wireless power transmitter 50 of the present invention. The low noise frequency band of 1 ~ 10GHz is used, and the reason why the microwave is used for spatial energy transfer between specific points is that the use of microwave reduces the size of the transmission / reception circuit components and improves the straightness of the RF signal. Because.

In addition, the transmission antenna 21 used in the wireless power transmission device 50 uses a beam radiation transmission antenna, and focuses the beam pattern of the antenna (Beam Forming), preferably should be able to adjust the beam pattern In addition, the sub-array configuration of the antenna may be classified into an active phased array method and a passive phased array method.

The wireless power receiver 30 constituting the wireless power transmitter 50 includes a power receiving antenna 31 for receiving microwaves carrying RF signals of 1 to 10 GHz band radiated from the wireless power transmitter 20. One end of the faucet antenna 31 is connected with a filter circuit 32 for extracting only the RF signal carried in the microwave, and an RF / converter for converting an input RF signal into a DC power source at the output of the filter circuit 32. The DC converter 33 is connected, and an output terminal of the RF / DC converter 33 is configured by connecting a charging unit 34 which continuously charges the DC power and supplies the driving power to the LED display board 10.

The faucet antenna 31 can selectively use a dipole antenna and a microstrip patch antenna, and in the case of a dipole antenna, there is an advantage in that it can be configured in various ways, but the polarization is a single polarization. Since it has (vertical or horizontal), there are many problems in manufacturing to apply the dual polarization method.

The gain is about 2 to 3 dB for the dipole antenna and about 4 to 5 dB for the microstrip patch antenna, so the patch is about twice as high. Actually, the conversion efficiency of the RF / DC converter 33 is measured. Compared with the microstrip patch antenna, the conversion efficiency is about 5% higher.

The RF / DC converter 33 is composed of a rectifying circuit, and the rectifying efficiency (conversion efficiency) of the rectifying circuit is a half-wave rectifying circuit, which is a direct current output power with respect to an AC input power. When adjusted, the price performance is superior to full-wave rectifier circuit.

Generally, the communication diode used in the rectifier circuit is designed to have a low reverse bias value in order to improve the sensitivity of the signal, but the rectifier diode used in the wireless power transmitter should use a large reverse voltage and a fast switching speed. Recently, due to the development of semiconductor technology, not only many rectifier diodes operating in the GHz band have been introduced, but also considering the switching speed, a Schottky Barrier Diode (GaAs) diode is most suitable.

Referring to the operation of the LED display board with a wireless power transmission device according to the present invention made as described above are as follows.

First, when AC power is supplied to the wireless power transmitter 20 of the wireless power transmitter 50 shown in FIG. 2, the AC / DC converter 22 converts AC power into DC power and outputs the DC power. The power is applied to the DC / RF converter 23 to be converted to a low noise frequency in the 1 to 10 GHz band and applied to the oscillator 24 for outputting microwaves.

The oscillator 24 outputs an RF signal of 1 to 10 GHz band output from the DC / RF converter 23 to a microwave that oscillates and outputs itself, and the microwave on which the RF signal is loaded is transmitted through an amplifier 25. After amplified to a predetermined level, it is radiated into space through the power transmission antenna 21.

On the other hand, the wireless power transmitted from the wireless transmitter 20 is received at the faucet antenna 31 of the wireless receiver 30 embedded in the LED display board 10 installed at a predetermined distance to be transmitted to the filter circuit 32. The filter circuit 32 extracts only the RF signal of the 1 to 10 GHz band and applies it to the RF / DC converter 33.

The RF / DC converter 33 charges the power by converting the RF signal applied from the filter circuit 32 to the original DC power supply to the charging unit 34, and the power charged in the charging unit 34 It is supplied to the control unit 12 of the LED display board 10 as driving power and is also applied to the switching unit 13.

Therefore, as shown in FIG. 1, when the control unit 12 is operated by the power supplied from the charging unit 34 of the wireless receiving unit 30 to light the LED display unit 11, the control unit 12 switches the switching unit 13. By controlling the ON state, the power charged in the charging unit 34 of the wireless power receiving unit 30 is supplied to the LED display unit 11 to display various information by the control data of the control unit 12.

Figure 3 is a block diagram showing another embodiment of an electronic board equipped with a wireless power transmission device according to the present invention, a plurality of wireless receiving unit (30a ~ 30n) in the LED display board 10, the plurality of wireless The power received from the power receivers 30a to 30n and the corresponding wireless power transmitters 20a to 20n are simultaneously stored in one main charger 40 so that the LED display board 10 becomes large and consumes a lot of power. This would be possible.

As described above, the present invention does not perform a separate wire wiring operation by embedding the wireless power transmitter 50 in the LED display board 10, and thus driving power is supplied by the wireless power transmitter 50 so that the LED display board 10 may be used. ) Does not perform a separate wire wiring work to provide a convenience in installation, and can improve the aesthetics due to the removal of the wire, and by charging the power to the charging section 34 to prevent power outages Without being bound, it is possible to continuously supply driving power to the wireless communication equipment when controlling the LED sign 10 by using wireless communication.

1 is a block diagram of an LED display board equipped with a wireless power transmission apparatus according to the present invention.

2 is a block diagram of a wireless power transmission apparatus applied to the present invention.

Figure 3 is a block diagram showing another embodiment of a signboard equipped with a wireless power transmission apparatus according to the present invention.

[Description of Symbols for Main Parts of Drawing]

10 LED display board 11: LED display unit

12 control unit 13 switching unit

20: wireless transmission unit 21: power transmission antenna

22: AC / DC converter 23: DC / RF converter

24: oscillator 25: amplifier

30: wireless faucet 31: faucet antenna

32: filter circuit 33: RF / DC converter

34: charging unit 50: wireless power transmission device

Claims (1)

In the LED display panel 11 which displays information in the form of various characters and images, and the LED control unit 12 for controlling the LED display unit 11, AC / DC converter 22 for converting AC power to DC power, DC / RF converter 23 for converting converted DC power to RF signal, and oscillator for outputting the converted RF signal on a microwave of 1 to 10GHz ( 24), an amplifier 24 for amplifying and outputting the microwaves carrying the RF signal to a predetermined level, a wireless transmission unit 20 consisting of a transmission antenna 21 for radiating the amplified signal into space; A power receiving antenna 31 for receiving microwaves carrying RF signals in a band of 1 to 10 GHz radiated from the power transmitting antenna 21 of the wireless transmitter 20, a filter circuit 32 for extracting only RF signals carried in microwaves, and The conventional wireless power transmitter 50 includes an RF / DC converter 33 for converting the extracted RF signal into a DC power source, and a wireless receiving unit 30 including a charging unit 34 for charging the DC power. Become, The wireless receiving unit 30 constituting the wireless power transmission device 50 is embedded in the LED display board 10, The output terminal of the charging unit 34 of the wireless receiving unit 30 is connected to the control unit 12 and supplied to the control unit 12 as driving power, Between the charging unit 34 and the LED display unit 11 of the wireless receiving unit 30 is turned on and off by the control signal of the control unit 12 to charge the charging power of the charging unit 34 to the LED display unit 11 LED display board with a wireless power transmission device characterized in that it comprises a switching unit 13 for supplying.

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