Street light for special lighting

Abstract

Street light for special lighting, characterized in that the light intended for operation on switched street lighting networks has a battery buffer and an interface to its own actuator or sensor-actuator system.

Description

[0001] Streetlights are generally connected to the power grid either individually via an actuator or via their own switched street lighting networks, which are de-energized outside of operating hours. In addition, there are self-sufficient lights powered by solar panels and batteries. Batteries are also increasingly used in street lighting infrastructure to power auxiliary equipment on the pole.

[0002] Mains-powered systems are ideally switched on as needed, at the point when natural light no longer meets the required standards. These standards vary depending on the specific local conditions.

[0003] In particular, areas with a high potential for danger (e.g. pedestrian crossings) must therefore be illuminated not only with special lights, but also before the fixed street lighting (special lighting).

[0004] However, due to the network design, it is usually not possible to implement different switching times for individual lights in existing street lighting networks, so that the entire system is switched on at the earliest necessary time.

[0005] The invention described in the claims below is motivated by the potential energy savings from cost-effective retrofitting of the technology in existing plants.

[0006] A combination of a charger, a sufficiently sized battery, a DC-capable ballast, an LED light source and an actuator or sensor-actuator system is proposed for use in a street lighting system.

[0007] The battery powers the actuator or sensor-actuator system outside of mains operation hours. In addition, the battery allows for short-term bridging operation of the light between the switching-on / off time of the general street lighting and the special lighting. The general diagram of the technical setup is shown in Fig. depicted.

[0008] A prototype was built using a 48V LiFePo battery (2) with a capacity of 10,000mAh. The target charging voltage of the battery is U Akku = 54.6V. For this purpose, an existing street light was modified by reducing the number of LEDs in the LED module (5) so that the forward voltage of the LED module is below the battery voltage U. Akku It lies. In addition, the LED driver was replaced. From the required luminous flux of each individual LED Φ LED as the nth component of the luminous flux Φ Leu and the UI characteristic curve u LED (i LED) of the LED used, results with the forward current of the LED i, which depends on the luminous flux. LED (Φ LED ) the number n=UAkkuuLED(iLED(ΦLeun)))

[0009] Using lumined Rebel Plus LEDs results in a required luminous flux Φ=Leu=4000lm the forward voltage uLED=(iLED=700mA)=2.8V and thus n=18

[0010] For the prototype, a suitable DALI-compatible control gear was extended to meet the additional technical requirements for compatibility with the D4i standard. One difference between DALI-compatible and D4i-compatible devices is the ability to supply the connected sensor-actuator system with both a 24V DC operating voltage and the DALI bus voltage. This was achieved using a DC-DC converter (6) for the 24V operating voltage and a suitable downstream voltage divider (7) for the DALI bus voltage (16V) (see Figure 7). Fig. ).

[0011] As a sensor-actuator system (4), various systems (Signify Interact, eSave and a gridDot from Amplex) were coupled to the system via a standard Zhaga interface. All systems offer remote control, time-controlled switching on and off, and autonomous, sensor-controlled operation.

[0012] The switching threshold is adjusted in sensor operation to increase or decrease a determined offset between sensor value and illuminance at the object being viewed (e.g. pedestrian crossing), so that switching on and off is performed as required. 2. List of reference symbols 1 charger 2 batteries 3 Ballast (In: DC, Out: CC) 4 Actuator or sensor / actuator system 5 LED modules 6 DC-DC converters (U out (= 24V) 7 voltage dividers (R1 = 6.8kΩ, R2 = 2.7kΩ)

Claims

[1] Street light for special lighting, characterized by that the luminaire intended for operation on switched street lighting networks has a battery buffer and an interface to its own actuator or sensor-actuator system. [2] Street light for special lighting according to claim 1, characterized by that the LED module is connected to the DC intermediate circuit of the battery charger and the battery via a D4i-compatible ballast (DALI, DALI-2, D4i are standardized designations for bus systems for lighting control. D4i describes an intra-luminaire DALI system.) (without conversion of voltage waveform and level). [3] Street light for special lighting according to the aforementioned protection claims, characterized bythat the luminaire has a D4i-compatible interface, via which the LED's control gear can be connected to an actuator or sensor-actuator system, which can switch the luminaire on or off independently of the mains supply as required. [4] Street light for special lighting according to the aforementioned protection claims, characterized by that the charger used is designed to fully charge the battery during the minimum nightly supply time, in addition to providing the operating power for the light and actuator or sensor-actuator system. [5] Street light for special lighting according to the aforementioned claims for protection, characterized by that the battery can maintain the operation of the lights without restrictions for a suitable time before and after the mains supply, and can supply the actuator or the sensor-actuator system for the entire voltage-free period. [6] System according to the aforementioned claims, characterized bythat the actuator or the sensor-actuator system is designed in such a way that remote switching on or off, time-controlled switching on or off or switching on or off depending on the illuminance is possible.

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