LED street light

Abstract

FIELD: lighting technology.SUBSTANCE: invention can be used in street and outdoor lighting installations based on LED lights using wireless communication technologies. The declared LED street light comprises a housing, a mounting unit, protective glass, modules with LEDs of two CCTs arranged in a staggered pattern, and terminal blocks. It includes a two-channel LED driver, each channel of which is connected to LEDs with the same CCT, a control module based on a NEMA connector, located on the light body, and a lighting controller installed in the control module, which converts radio control signals transmitted in automatic mode or in manual mode on command from the dispatcher, into electrical signals arriving at two independent input channels of the LED driver.EFFECT: expansion of the functional capabilities of the light while simplifying the design due to the use in the light circuit of a two-channel LED driver with two independent output channels: one for regulating the output current for controlling the power of the LEDs, the other for regulating the colour temperature.5 cl, 6 dwg

Description

[0001] The invention relates to the field of lighting technology and can be used in street and outdoor lighting installations created on the basis of the LED luminaires in question, with the possibility of using wireless communication technologies, for the following purposes:

[0002] - regulation of the power and color temperature of the lamp radiation to expand the functionality of street lamps;

[0003] - creating intelligent lighting;

[0004] - reducing the energy consumption of lighting installations at night, when traffic is noticeably reduced and it becomes possible to reduce lighting levels;

[0005] - ensuring traffic safety in deteriorating weather conditions (fog, rain), creating a comfortable lighting environment, and improving visibility on roads as a result of changing the correlated color temperature (CCT);

[0006] - control and monitoring of operating conditions of lamps.

[0007] An energy-saving outdoor lighting luminaire (patent RU 2452893 C1, published 10.06.2012, IPC F21S 8 / 00) is known for systems with centralized control of lighting of roads, streets, parks, and local areas powered by a three-phase network, which can be used in single-phase power supply networks with local control. The outdoor lighting luminaire comprises three LED drivers, a LED block, and a thermal relay. The invention solves the problem of energy conservation, ensuring uniformity of illumination when the automated system switches to energy-saving or standby "night" modes by three-level regulation of the luminous flux of each luminaire included in the street lighting line by switching each of the three phases of the network from the central or nodal control points in a three-phase network and disconnecting one phase when the permissible outside air temperature is exceeded.

[0008] The disadvantages of this invention are:

[0009] - no remote control channel, power supply switching is carried out by turning off / on the phases of the three-phase network using an astronomical timer or photo relay;

[0010] - the need for three drivers to ensure energy saving by switching each of the three phases of the network from the central or nodal control points in a three-phase network and disconnecting one phase when the permissible outside air temperature is exceeded, i.e. stepwise regulation of the luminous flux of the lamp and the lack of the ability to smoothly regulate the power of the lamp;

[0011] - direct connection to the phases of a three-phase network without standardized control connectors.

[0012] The closest to the claimed invention is a multifunctional lighting device according to patent RU 201380 U1 (published 11.12.2020, IPC F21S 8 / 00), which can be used in lighting systems, security systems, environmental control and monitoring. The stated problem, which consists in expanding the functionality of street lamps, solving problems of intelligent lighting, public and environmental safety, and reducing the number of individual devices used in conjunction with the lamp when installed on street lighting poles, is solved by integrating a gas analyzer, a light sensor, a video surveillance camera, a loudspeaker, a Wi-Fi access point, and a multifunctional lamp housing designed for installation of the above devices into a single wireless control and data collection device (ZigBee).The light output of the lighting modules is regulated by a lighting control system built on ZigBee communication technology, based on established control algorithms that operate using motion and light sensors, as well as a calendar. The light sensor measures background light levels, and the gas analyzer measures the concentration of harmful substances in the air. Light sensor and gas analyzer data are transmitted via radio using ZigBee technology to the control and monitoring system.

[0013] The disadvantage of this multifunctional device is the presence of additional elements in the design of the lamp, such as a video surveillance camera, light sensor, gas analyzer and loudspeaker, which will lead to an increase in the cost of the lamp and an increase in its energy consumption.

[0014] Abbreviations used

[0015] CCT – correlated color temperature (GOST R IEC 60050-845-2025, 845-23-068).

[0016] PWM (from English pulse-width modulation) – pulse-width modulation (PWM) (GOST R 59031-2020).

[0017] GSM (from the name of the working group Groupe Special Mobile) is a digital standard for second-generation cellular communications (2G) (renamed to Global System for Mobile Communication) (CTO 56947007-33.060.20.233-2016).

[0018] LoRaRAW – an operating mode of LoRa modules in which data is transmitted “raw”, without using a network protocol (from the English Raw – raw) (P 50.1.031-2001 Terminological dictionary. Part 1. Stages of the product life cycle. 3.9.22).

[0019] LoRa (from English Long Range) is a method of radio signal modulation designed for data transmission over long distances (up to 15–20 km under ideal conditions) with extremely low power consumption (P 50.1.031-2001 Terminological dictionary. Part 1. Stages of the product life cycle. 3.9.22).

[0020] NB-IoT (from Narrow Band Internet of Things) is a full-fledged cellular communication standard with low-speed data transmission, specially designed to provide communication in the Internet of Things (IoT).

[0021] IoT (from the English Internet of Things), the Internet of Things is a network concept in which devices equipped with sensors and software exchange data with each other and the external environment (GOST R 71777-2024 (ISO / IEC 20924:2024)).

[0022] NEMA (National Electrical Manufacturers Association) is an American electrical manufacturers' association that develops standards for electrical products, including lighting fixtures, connectors, enclosures, and control systems. NEMA connectors are used not only for power supply but also for lighting control (dimming, on / off, and intelligent control).

[0023] The object of the present invention is an LED street light with a structure that has expanded functionality compared to traditional street lights, making it possible to solve the problems of intelligent lighting, public safety, and energy consumption reduction.

[0024] The objective of the technical solution is to develop an LED street lamp with the ability to remotely wirelessly control its power and correlated color temperature of the emitted light.

[0025] Traditional outdoor lighting fixtures typically don't provide a way to change the correlated color temperature. Furthermore, the luminaire's power is often controlled by switching it on / off, meaning the luminaire either operates at 100% or doesn't operate at all.

[0026] The technical result of the claimed technical solution is the expansion of the functional capabilities of the luminaire while simplifying the design due to the use in the luminaire circuit of a two-channel LED driver with two independent output channels: one for regulating the output current for controlling the power of the LEDs, the other for regulating the color temperature.

[0027] The technical result is achieved due to the fact that the LED street lamp, comprising a housing, a mounting unit, a protective glass, modules with LEDs of two CCTs, arranged in a staggered manner, terminal blocks, includes a two-channel LED driver, each channel of which is connected to LEDs with the same CCT, a control module based on a NEMA connector, located on the lamp housing, and a lighting controller installed in the control module, converting radio control signals transmitted in automatic mode or in manual mode at the command of the dispatcher, into electrical signals arriving at two independent input channels of the LED driver.

[0028] The LEDs have two CCT values: 2700 K and 5000 K.

[0029] The control signals coming from the lighting controller can be analog (0 / 1–10 V) or pulse-width modulated (PWM).

[0030] The control of the lamp mode is carried out wirelessly via GSM, LoRaRAW, or NB-IoT radio protocols, which are transmitted by the lighting controller to the input channels of the two-channel LED driver in the form of analog (0 / 1–10 V) or PWM signals, which enables remote wireless control of the power and correlated color temperature of the emitted light.

[0031] In this case, the change in the power of the lamp is carried out by changing the current in both output channels of the LED driver depending on the level of the control signal received at the first control input, regardless of the value of the control signal received at the second control input.

[0032] The combination of LED power and CCT is set independently of each other with a smooth change in the power of LED modules from 0 to 100% and a smooth change in CCT in the range from 2700 K to 5000 K, using two driver output channels to control two groups of LEDs with different CCTs (warm and cold) in modules with their staggered arrangement for color mixing.

[0033] This provides the stages of activating the luminaire to emit light of the first color and deactivating light of the second color, or vice versa, with the possibility of continuing to emit light of a given color temperature.

[0034] Power is supplied to the luminaire by inserting a three-wire cable into the luminaire, consisting of an L-phase power conductor, an N-neutral power conductor, and a PE-protective (grounding) conductor, connected to the driver via terminal blocks.

[0035] The essence of the invention is explained in the following drawings.

[0036] Fig. 1 shows the structure of the lamp.

[0037] Fig. 2 shows the structural electrical diagram of the lamp.

[0038] Fig. 3 shows the functional diagram of a two-channel LED driver with the ability to separately control the power and correlated color temperature of the LED luminaire, the control signal is 0 / 1–10 V.

[0039] Fig. 4 shows the functional diagram of a two-channel LED driver with the ability to separately control the power and correlated color temperature of the LED luminaire, the control signal is pulse-width modulation (PWM).

[0040] Fig. 5 shows the LED module of the lamp, on which LEDs of two different CCTs are installed in a checkerboard pattern.

[0041] Fig. 6 shows the percentage change in output currents I о / I уст (I о – initial current, I уст – the set value of the current) of the driver channels depending on the supplied control signal U регулin volts when using the 0-10V control protocol:

[0042] - Fig. 6a shows the implementation of control for regulating the power of a lamp by changing the total output current (vertical axis I о / I уст ) when changing the control signal (horizontal U-axis регул );

[0043] - Fig. 6b shows the implementation of the control of the CCT regulation of the lamp by changing the output current of each channel (vertical axis I о / I оуст ) when the control signal changes (horizontal U-axis регул ) (The black curve is the output current for channel #1 (LEDs with one CCT are connected to it, for example, 2700 K), the blue curve is the output current for channel #2 (LEDs with another CCT are connected to it, for example, 5000 K).

[0044] The drawings indicate the following positions:

[0045] 1 – aluminum body;

[0046] 2 – mounting unit;

[0047] 3 – protective glass;

[0048] 4 – LED module;

[0049] 5 – panel with electrical components;

[0050] 6 – UNILIGHT NEMA control module;

[0051] 7 – L-phase power input to the lamp;

[0052] 8 – N-neutral power wire;

[0053] 9 – PE-protective (grounding) wire;

[0054] 10 – terminal blocks;

[0055] 11 – dual-channel LED driver;

[0056] 12 – V+ power supply for LED boards (common “plus” for both channels);

[0057] 13 – V1 – power supply for LED boards (“minus” of the first channel);

[0058] 14 – V2 – power supply for LED boards (“minus” of the second channel);

[0059] 15 – Dim- common output of control channels;

[0060] 16 – Dim1+ / KCT input #2 for color temperature control;

[0061] 17 – Dim2+ / Dim+ input #1 for controlling the lamp power;

[0062] 18 – control element sending 0 / 1-10V signal;

[0063] 19 – control element that sends a pulse-width modulation (PWM) signal.

[0064] Depending on the level of the control signal supplied to the control inputs of channel No. 1 (see 15, 16 in Fig. 3, Fig. 4) and channel No. 2 (see 15, 17 in Fig. 3, Fig. 4), a change in the current occurs in both output channels (see 12, 13, 14 in Fig. 3, Fig. 4) of the LED driver (Fig. 6), which leads to a change in the radiation power of the LEDs and the CCT of the luminaire.

[0065] For the PWM control signal, the diagrams have a similar appearance.

[0066] The proposed technical solution implements integration with existing fastening and power supply standards by using a control module (e.g. UNILIGHT NEMA) based on a unified NEMA 7pin connector (e.g. NEMA / JL-240XA1412R7P-N1) (see 6 in Fig.1) with a lighting controller (e.g. ICB-220-NEMA LoRaWAN) designed to control the power of a luminaire based on controlled LED drivers with a 0 / 1–10 protocol or PWM signals over a wireless network in automatic mode or manually upon a command from a dispatcher through standardized contacts.

[0067] By using a dual-channel driver (for example, INVENTRONICS EUW series) (see 11 in Fig. 2) with two independent input control channels: one for controlling the LED power by regulating the output current with the possibility of programming (see 15, 16 in Fig. 3), the other for regulating the color temperature (see 15, 17 in Fig. 3), it is possible to set any combination of LED power and CCT independently of each other, with a smooth change in power from 0 to 100% and a smooth change in CCT in the range from 2700 K to 5000 K.

[0068] Two output channels of the LED driver are used (see 12, 13, 14 in Fig. 3) to control two groups of LEDs of different CCT (warm + cold) (see 4 in Fig. 1) in modules with their staggered arrangement for color mixing (Fig. 5).

[0069] To activate the luminaire to emit light of the first color and deactivate light of the second color, or vice versa, a transition between the color temperatures of the light emitted by the luminaire is performed by using software in automatic mode or in manual mode at the command of the dispatcher; a smooth transition from the emission of light of the first color temperature to the emission of the second color temperature can also be ensured with the possibility of continuing the emission of a given color temperature (Fig. 6).

[0070] Power is supplied to the luminaire by introducing a three-wire cable into the luminaire, consisting of an L-conductor of the power phase (see 7 in Fig. 2), an N-neutral power conductor (see 8 in Fig. 2), and a PE-protective (grounding) conductor (see 9 in Fig. 2). These conductors are connected to the driver (see 11 in Fig. 2) via terminal blocks (see 10 in Fig. 2).

[0071] The change in the power of the lamp is carried out by changing the current in both output channels of the driver (Fig. 3) depending on the level of the control signal supplied to control input No. 1 (see 12, 13 in Fig. 3), regardless of the value of the control signal supplied to control input No. 2 of the LED driver (see 12, 14 in Fig. 3).

[0072] Control signals are received as analog (0–10 V) or PWM signals to separate driver inputs. The 0–10 V (see 18 in Fig. 3) and PWM (see 19 in Fig. 4) control elements are located outside the luminaire.

[0073] In accordance with Fig. 1, the luminaire consists of: an aluminum housing 1, a mounting unit 2, a protective glass 3, LED modules with two groups of LEDs of different CCT 4, a panel with electrical components 5, a control module based on a NEMA 7-pin connector with a lighting controller 6. In addition, the device contains the necessary components for direct connection via a cable to a 220 V network. This lighting device implements a power and color temperature control circuit.

[0074] To receive control radio signals (wireless data transmission protocols GSM, LoRaRAW, NB-IoT), a UNILIGHT NEMA control module is used) based on a unified NEMA 7pin connector (see 6 in Fig. 1) (for example, NEMA / JL-240XA1412R7P-N1), installed on the housing of the lamp 1, and a lighting controller (for example, ICB-220-NEMA LoRaWAN) with a transceiver and antenna, installed in the control module (see 6 in Fig. 1) and supporting the above-mentioned wireless data transmission protocols.

[0075] The lighting controller converts radio control signals into electrical signals to control the power of the lamp and its color temperature (two independent control signals).

[0076] The control module NEMA connector is used:

[0077] - 3 contacts for 230V AC power supply of lighting controller,

[0078] - 4 pins for transmitting control signals from the controller to the dual-channel LED driver.

[0079] Control signals can be analog (0 / 1-10 V) (Fig. 3) or pulse width modulated – PWM (Fig. 4).

[0080] The luminaire is equipped with a two-channel LED driver (for example, INVENTRONICS EUW series) (see 11 in Fig. 2), which serves to supply the LEDs with a stabilized current, the value of which can change depending on the value of the control signals (Fig. 3, 4).

[0081] Dual channel LED driver has the following features:

[0082] - two independent output channels for powering LEDs with stabilized current II and I2;

[0083] - the ability to change the output current in both channels at once or separately in each channel depending on the value of the control signal (Fig. 3, 4).

[0084] The luminaire is equipped with two-channel LED boards (Fig. 5), each channel uses LEDs with a specific CCT: for channel No. 1, warm white LEDs with a CCT of 2700 K are used, for channel No. 2 – cold white LEDs with a CCT of 5000 K.

[0085] Depending on the level of the control signal arriving at control input No. 1 of the two-channel LED driver (Fig. 3, 4), regardless of the value of the control signal (Ureg) arriving at input No. 2, a change in current occurs for both output channels of the LED driver, leading to a change in the power of the lamp from the maximum value to the minimum and vice versa (Fig. 6a).

[0086] To change the CCT of the luminaire, the current in each output channel of the two-channel LED driver is changed depending on the value of the control signal supplied to input No. 2 (Fig. 3, 4), while the maximum current is determined by the value of the output current set in control input No. 1.

[0087] For example, if the 0 / 1-10V protocol is used as the control signal and a control signal of 0V is received at the driver's control input No. 2, the driver will generate a rated current of I=I for the output channel No. 1. ном =100%, and for the output channel of driver No. 2 – current I= 0. As a result, only warm-white LEDs with a CCT of 2700 K, connected to output channel No. 1, are turned on, and cold-white LEDs, connected to output channel No. 2 of the two-channel LED driver, are turned off (Fig. 6b).

[0088] When signal U is applied to control input No. 2 регул= 10 V the driver generates current I= 0 on output channel No. 1, and current I=I on output channel No. 2 ном =100%. As a result, only the cold white LEDs with a CCT of 5000 K connected to channel #2 are turned on, while the warm white LEDs connected to channel #1 are turned off.

[0089] If the control signal (U регул ) takes an intermediate value between 0 and 10 V, then the current in each output channel of the driver is formed in accordance with the linear dependence shown in Fig. 6b. In this case, the LEDs of both channels are turned on (illuminated), and the resulting CCT is formed as a result of the spatial mixing of light from the warm-white and cold-white LEDs and is in the range from 2700 K to 5000 K, depending on the ratio of currents in each output channel of the driver (Fig. 6b). Thus, smooth regulation of the CCT of the luminaire from 2700 K to 5000 K is carried out.

[0090] Power regulation and smooth CCT adjustment of the luminaire are performed independently. For example, you can set the luminaire power to 50% of the nominal value and then set the desired CCT. Conversely, after setting the desired CCT, you can then set the desired luminaire power.

[0091] Control signals are typically generated using software that allows for manual or automatic setting of the required power levels and CCT of the luminaire and sending them to a transceiver device for encoding and transmitting these values ​​as control signals via a corresponding wireless data channel. These components are essential parts of modern ASUNO (automated outdoor lighting control system) systems (e.g., DigiCity https: / / digicity.io / light / ).

[0092] Thus, the proposed solution expands the possibilities of using LED luminaires by providing remote, smooth and independent control of the power and color temperature of street luminaires, and also simplifies the hardware by using a dual-channel LED driver and a standardized control module connector for the lighting controller.

[0093] This circuit allows for smooth regulation of luminaire power and CCT control independently of each other using control signals from the lighting controller. Control signals can be analog (0 / 1–10 V) or pulse-width modulated (PWM).

Claims

1. An LED street light fitting comprising a housing, a mounting unit, protective glass, modules with LEDs of two CCTs arranged in a staggered pattern, terminal blocks, characterized in that it includes a two-channel LED driver, each channel of which is connected to LEDs with the same CCT, a control module based on a NEMA connector, located on the housing of the light fitting, and a lighting controller installed in the control module, converting radio control signals transmitted in automatic mode or in manual mode at the command of the dispatcher, into electrical signals arriving at two independent input channels of the LED driver.

2. A LED street light according to paragraph 1, characterized in that the LEDs have a CCT of two values: 2700 K and 5000 K.

3. A LED lamp according to paragraph 1, characterized in that the control signals coming from the lighting controller can be analog (0 / 1–10 V) or pulse-width modulated (PWM).

4. A LED street light according to paragraph 1, characterized in that the light mode is controlled wirelessly via GSM, or LoRaRAW, or NB-IoT radio protocols, which are transmitted by the lighting controller to the input channels of the two-channel LED driver in the form of analog (0 / 1–10 V) or PWM signals.

5. An LED street light according to paragraph 1, characterized in that the change in the power of the light is carried out by changing the current in both output channels of the LED driver depending on the level of the control signal received at the first control input, regardless of the value of the control signal received at the second control input.

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