CZ2017819A3 - Power supply - Google Patents

Abstract

The electrical apparatus of the present invention is a power supply comprising a control block (1), a current measurement block (2) and a light source, and further comprising an Ethernet communication module (6) and a Bias-T block (5) for high-speed data modulation DC power supply. This device allows the luminaires to transmit high-speed data and their subsequent propagation by a modulated light beam for communication of the fiber-free network type (so-called BroadbandLIGHT).

Description

Technical field

The invention is in the field of electrical engineering. It is a device enabling luminaires, eg with LED technology, to transmit high-speed data and then distribute it with a modulated light beam for optical fiber-free network communication.

BACKGROUND OF THE INVENTION

According to the state of the art, LED luminaires are commonly used which either do not have the possibility to regulate the intensity of illumination or use the so-called PWM (Pulse Width Modulation) principle. These solutions do not make full use of the energy savings potential offered by LED technology and also do not allow continuous high-speed data transfer. An example is a luminaire without lighting control, see Figure 1. Which means that the control block contains: power rectifier, rectified voltage filtering circuits (possibly also PFC “power factor correction” for input current correction), control circuit for keeping constant current of power LEDs (usually one of the typical connections for pulse sources, which have significantly higher energy efficiency than analog sources), which may also contain an element for galvanic isolation of power supply circuits (eg transformer) and which usually contains elements for energy storage (eg coil, capacitor, etc.). Further, the current measuring block comprises: a circuit for measuring the value of the passing current, which may be, for example, a resistor shunt, a sensor using a Hall effect, etc. The block may also comprise a measured signal amplifier. Consequently, the LED block comprises at least one, but mostly more, power LEDs connected in different series-parallel combinations and mostly mechanically mounted on the cooling surfaces to provide heat dissipation.

Another example is a luminaire with lighting control (see Figure 2), which contains the same blocks as in the previous case, but in addition to the control block, the control circuit for keeping the current constant by power LEDs is supplemented by analogue control, eg 0-10 V, which has the disadvantage that it is not usable at longer distances of the luminaires. Alternatively, a low frequency PWM controller may be placed between the control block and the current measurement block, which is not suitable for transmitting high speed light beam data because it produces an intermittent (pulse) current supplying the LED.

We use at least 1 capacitor and at least 1 inductor called a bias-T modulator in the electronics to combine the power and radio frequency signals or to separate the radio signal from the power supply. Currently, patents disclose solutions of a bias-T modulator with either a high-frequency (RF) bandwidth constraint by narrow or otherwise inappropriate transmission bandwidth, or a power-bandwidth constraint by maximum transmit current or maximum input voltage. All of these limitations are a negative factor in the implementation of VLC Visible Light Communication (BL BroadbandLIGHT) using indoor or street LED lighting.

Wide bandwidth bias tee solution US 6657522 describes a broadband bias-T modulator design designed for use in radio frequency (RF) technology with a range of 1GHz to 40GHz, which does not meet the frequency requirements of the technology minimum frequency f _mi "= 2MHz or parameters power supply LED lighting U _m i "= l 12V, /,! _{I (} " = 700mA.

Another example of a Bias-T circuit US 20070063771 A1 describes a special circuit solution to provide high output power including large bandwidth. The disadvantage is

- 1 GB 2017 - 819 A3 use of a high frequency transistor limiting the minimum RF signal frequency / _{m! B} = 30GHz (required / ,,,, - ,, = 2 MHz) and at the same time the solution is considerably limited by the maximum supply voltage according to the transistor used U _max = 3QN (required t / _{m! B} = 112V).

EP 1525679 discloses a wiring suitable for integration into mobile communication devices, respectively, for providing radio frequency signals and a power source for the outdoor equipment of a base transceiver station (BTS) in a Bias-t apparatus and a central conductor in one. mobile communication system. Frequency and power parameters not suitable for SDS.

Reduced size bias-tee solution US 8922306 B2 describes a procedure for reducing bias-T wiring for RF technology with respect to minimum dimensions. Again, for the use of high speed data transmission and LED illuminators, both the frequency band and the power range are inappropriate.

SUMMARY OF THE INVENTION

The above disadvantages are overcome by the invention which uses a combination of a new intelligent LED power supply with an Ethemet communication interface, an existing 230V 50Hz / Ethemet (BPL Broadband over PowerLine) power converter, a new bias-T modulator and luminaires. The combination creates an intelligent luminaire with network data acquisition, remote lighting control and regulation, plus the added VLC Visible Light Communication capability and broadband data reception in either infrared or RF license-free bandwidth 2.402 to 2.480 GHz.

The device thus represents an electric circuit for luminaire supply, which is connected to the mains power supply, eg 230V / 50Hz, and allows to control the intensity of illumination by Ethemet data transmission and at the same time use emitted light to transmit high-speed data over the light beam.

This device is shown in Figure 3. The control block is connected to the 230 / 50Hz power supply network, the control circuit contained in the control block being complemented by an Ethemet network communication module and further preferably the control block is connected to the current measurement block. Thanks to the Ethemet communication module, low-frequency PWM is not required in the device and it is possible to directly control the constant current level to the light source and thus the light intensity via data communication. The advantage of this solution is that the power supply to the light source is pure DC without interruption, disturbing ripple, modulation, etc. Furthermore, the device includes a Bias-T block, which is located between the current measurement block and the light source block.

The Bias-T block provides modulation of high-speed DC data to a light source (eg LED).

The BPL converter receives Ethemet standard data communication over the existing power line, ie without the need to build additional new structured cabling using OFDM modulation (Orthogonal frequency division multiplexing). The connecting block is an ethemet switch enabling connectivity of other devices of both control and feedback circuits or additional devices such as meteorological sensors / cameras / audio devices. The control circuit is a power supply with an ethemet interface, a light switch function and a brightness setting. This power supply (ethemet LED driver) is a special design of LED power driver, which allows remote regulation using the Ethemet standard and modern communication protocol MQTT (Message Queuing Telemetry Transport) and its DC (DC) output for power supply filtered, respectively. the negative influence of DC-PWM on data transmission within electronic communications via VLC is avoided. Another fusion unit is a power modulator based on Bias-T. This modulator concept is based on the so-called power switch, which is

-2GB 2017 - 819 A3 commonly used in RF technology in modified circuitry to achieve parameters more suitable for VLC for use in luminaires. The Bias-T based power modulator is based on the IEEE 1901 BPL chipset frequency band required bandwidth. This standard defines the lower frequency fmin = 2 MHz at the current minimum bandwidth B = 100 MHz. The reason is the frequency reserve for the possibility of simultaneous deployment of narrow-band Power Line Communication (PLC) technology. The currently available power Bias-T solutions are defined by a lower frequency f _min that is around 10 MHz. Another change in the design of Bias-T for BVL technology must reflect the lighting-based conditions. Recently, in the lighting industry, there has been a trend of decreasing the current value of the working point Idc while increasing the voltage value of the working point Udc. For example, an ordinary 80 W street light defines its original LED driver to define its operating point as //><= 700 mA and 77z> c = 112 V. On the other hand, indoor lighting, a 44 W spot light , its driver defines the operating point in the form of //><= 700 mA and 77z> c = 62 V. The currently available Bias-T power solutions can handle high current loads without problems (Zz> Cmox = 1.5 A), but a very limiting factor the DC input voltage is low (ί7ΰ ^ αχ = 30 V).

The last functional unit is telemetry (feedback), both for the operation of the VLC LED driver and for the needs of the luminaire as a whole.

For the purposes of the present invention, a light source block is understood - for example, an LED, a laser, and the like.

Clarification of drawings

Figure 1 shows the state of the art - a power supply for a LED light without regulation. Figure 2 represents the state of the art - power supply for LED luminaires with analogue or PWM control. Figure 3 shows an exemplary solution of a power supply according to the invention and Figure 4 shows a modification thereof as described in Embodiment 2.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

The control block 1 is connected to the 230V / 50Hz supply network, while the control circuit contained in the control block 1 is supplemented with a module 6 for communication with the Ethemet network. Furthermore, the control block 7 is connected to the current measurement block 2. Further, the device comprises a Bias-T block 5, which is located between the current measurement block 2 and the light source block 3. Block 5 of the Bias-T provides modulation of high-speed data to DC power to the LED, see Figure 3.

Example 2

Example 2 differs from example 1 in that it contains a Power Line module 7, which is located in front of the control block 1 and is connected to a 230V / 50Hz power supply network, which is modulated by Ethemet data communication, see Figure 4.

Example 3

Example 3 differs from Example 1 in that the current measurement block 2 is combined with the control block L

Example 4

Example 4 differs from example 1 in that the device does not have a current measurement block 2.

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Industrial applicability

The device is usable in the areas of light source control and also for the transmission of high-speed data and their subsequent distribution by a modulated light beam for optical fiber-free network communication (BroadbandLIGHT technology).

PATENT CLAIMS

Claims (3)

A power supply unit comprising a control block (1), a current measurement block (2) and a light source, characterized in that a control block (1) is connected to the electric power supply and connected to the current measurement block (2) and a module (6) for communication with the Ethemet network, the block (2) being further connected to the light source block (3). A power supply according to claim 1, characterized in that a Bias-T block (5) is provided between the current measurement block (2) and the light source block (3) to modulate the high-speed DC data to the light block (3). resources. Power supply according to the preceding claims, characterized in that it comprises a Power Line module (7) which is located in front of the control block (1) and is connected to a 230V / 50Hz power supply network which is modulated by Ethemet data communication.