Lighting device and lighting system for an exterior environment

Abstract

The invention relates to a lighting device (100) for outdoor use, such as a garden light. The lighting device (100) includes light sources (111 to 115) which generate multicolored light from electrical power and emit it into the outdoor area. The lighting device (100) has a power supply connection (120) to supply the light sources (111 to 115) with electrical power. Furthermore, the lighting device (100) has a control device (130) for controlling the timing of the supply of electrical power to the light sources (111 to 115) from the power supply connection (120). The control device (130) is connected to the power supply connection (120) on its input side and to the respective light sources (111 to 115) on its output side via switching elements (132). The switching devices (132) can each be switched between a pass state (DZ) and a cut state (TZ) by means of a pulse width modulated control signal (SES1 to SES5).In the pass-through state (PD), the power supply connection (120) and each of the light sources (111 to 115) connected to the switching device (132) are connected for electrical power supply. In the disconnected state (DDS), the power supply connection (120) and the respective light sources (111 to 115) are disconnected. The control device (130) further comprises a control section (131) adapted to switch one of the switching devices (132) to the pass-through state (PD) only if at least one other light source (111 to 115) is not simultaneously supplied with electrical power. The invention further relates to a lighting system (200) with the aforementioned lighting device (100).

Description

[0001] The present invention relates to a lighting device for outdoor use, such as a garden light, comprising a light source and a control device by which the brightness and color of the emitted light are controlled by PWM signals. The invention further relates to a lighting system with such a lighting device.

[0002] Electric outdoor lights have many uses. They are used for leisure activities in the garden, for illuminating parking lots and paths, or for preventing accidents, break-ins, or theft.

[0003] Here, a high degree of flexibility in choosing the installation location is desirable, as the lights are usually to be mounted far from connections to the house's electrical system. Therefore, running cables outdoors from the lights to the house's electrical connection may be necessary to supply the lights. However, for the proper installation of cables carrying 230V alternating current (AC), several technical requirements must be met, such as a minimum burial depth of 60cm below the surface, a sandy substrate, and the use of specially insulated conduits and cables. Cable installation is thus relatively complex. Consequently, once installed in the garden, the lights have relatively little flexibility for later repositioning.Furthermore, the regulations that must be observed pose a significant obstacle, particularly for DIY enthusiasts, thus limiting their options when selecting and installing lighting. Therefore, lighting systems that utilize a 24V DC operating voltage are becoming increasingly popular among DIYers. Unlike laying cables for a 230V AC household connection, cables connected to a 24V DC power supply are not subject to comparable stringent requirements, allowing for simple and flexible installation. This eliminates the obstacle of potentially repositioning the garden lights at a later date.

[0004] One disadvantage of a 24V DC power supply is that, due to ohmic line losses, a sufficient voltage supply to the garden lights cannot be guaranteed in some applications. This can occur particularly when relatively long distances (e.g., 10m or more) have to be bridged between the 24V DC power supply and a garden light by means of cables. The resulting line resistance can lead to a voltage drop under the load currents required to meet the power demand of the lights, at which point the garden lights are no longer supplied with a sufficient supply voltage.

[0005] The power requirements of a light fixture result, for example, from its design and operation.

[0006] Typical luminaire designs allow for adjustment of the light intensity and color. This is achieved using controllable LEDs with different wavelengths of light emission. For example, three LEDs emitting red (R), green (G), and blue (B) light, as well as one LED emitting warm white (WW) and one LED emitting cool white (KW) light, are commonly used.

[0007] The problems that arise with such lights using a 24V DC power supply are illustrated numerically by the following example calculation: Maximum power consumption of a single LED: I_F = 0.4A Number of LEDs per light: n = 5 Resulting maximum current per light: I_max_Leuchte = n × I_F = 2A Number of lights on one cable harness: m = 12 Resulting maximum current per cable strand: I_max_strand = m × I_max_luminaire = 24A Cable resistance at a cable length of 30m (with copper wire and a wire diameter of 0.85mm): R_line = 1.1 Ohm Resulting voltage drop across the cable harness: U_loss = R_line × I_max_strand = = 26.4V

[0008] This example calculation clearly demonstrates that a 24V DC power supply is insufficient to power twelve identical LED garden lights via a 30m long copper cable. The garden lights cannot operate due to the resulting voltage drop of 26.4V, as no voltage reaches the lights with a 24V DC power supply. Users are therefore forced to connect fewer lights per cable run or resort to a power supply via the 230V AC mains supply.

[0009] Typical operating modes of the luminaire include light control implemented via a microcontroller. The microcontroller directly controls each of the five LEDs via its own color channel. Each color channel outputs a control signal to the microcontroller's signal outputs. Pulse-width modulated (PWM) signals are typically used as control signals to directly control the power supply to the individual LEDs. PWM signals have a variable ratio between an on-time (t_On) and an off-time, while the period (T) of the signal remains constant. During the on-time, a high signal (e.g., 5V) is present, and during the off-time, a low signal (e.g., 0V) is present.The ratio between the on-time (t_ON) and the period (T=t_On+t_Off) is called the duty cycle.

[0010] PWM signals are used, for example, to switch on an LED connected to a color channel by outputting a high signal (e.g. 5V) on that color channel, while a low signal (e.g. 0V) on the color channel switches the LED off.

[0011] The control signals for the color channels are often output in parallel by the microcontroller to the individual color channels. In this approach, all color channels can initially be set to a low signal during a PWM cycle and then, as needed, switched to a high signal during the course of the cycle. The switching point (t_switch = T - t_ON) depends, for example, on the color mixing requirements. At the end of a PWM cycle, all color channels output a high signal. In addition to this control method, a variant also exists in the prior art where all color channels are set to a high signal at the beginning of the PWM cycle and switched to a low signal as needed. Both control signal variants have in common that all color channels can output a high signal simultaneously at certain times, and therefore a power supply must provide a simultaneous current flow through all LEDs during this period.

[0012] Figure 5 This shows an example of the control signal variant presented first. In this case, in Figure 5 The waveforms of five control signals (SES1 to SES5) within one PWM period (T) are shown as examples. The five control signals (SES1 to SES5) are output in parallel on five color channels. Figure 5 It becomes clear that each of the control signals (SES1 to SES5) outputs a high signal simultaneously with other control signals (SES1 to SES5) for one period segment. Accordingly, over one PWM period (T), the total current (I_total) through a cable increases in steps.

[0013] For longer cable lengths (e.g. 10m or more), the lighting control systems known from the state of the art, which sometimes result in considerable voltage drops, must be expected, which do not allow for the practical operation of luminaires with a supply other than the mains voltage.

[0014] Another disadvantage of these lighting control systems is that frequent switching and current changes cause ripple effects in the power supply, generating switching spikes and high-frequency interference. To counteract such ripple effects, appropriate design measures, such as the inclusion of filter stages, or specially designed components for a 24V DC power supply are necessary. This makes the luminaires more complex and expensive to design, as, for example, specially designed power supplies must be used.

[0015] The object of the invention is to at least partially overcome the disadvantages described above. In particular, the object of the invention is to provide a garden light that can be operated from a low-voltage power supply, reduces line losses and ripple loads on the power supply.

[0016] The foregoing problem is solved by a lighting device having the features of claim 1 and by a lighting system having the features of claim 15.

[0017] Further advantages and features of the invention will become apparent from the dependent claims, the description and the drawings.

[0018] Features and details described in connection with the lighting device according to the invention naturally also apply in connection with the lighting system according to the invention, and vice versa, so that with regard to the disclosure of the individual aspects of the invention, mutual reference is always made or can be made.

[0019] One aspect of the present invention relates to a lighting device for outdoor use. The lighting device includes light sources for generating light from electrical power for emission to the outdoor area. The light sources have at least partially different wavelength ranges. The lighting device also includes a power supply connection for supplying the light sources with electrical power. Furthermore, the lighting device includes a control device for controlling the timing of the supply of electrical power to the light sources from the power supply connection. The control device is connected to the power supply connection on its input side. On its output side, the control device is connected to the respective light sources via switching devices. Each switching device can be switched between an on / off state and an off state by means of a pulse-width modulated control signal.In the forward-facing state, the power supply connection and the respective light source connected to the switching device are connected to each other for electrical power supply. In the disconnected state, the power supply connection and the respective light source are disconnected from each other. The control device also includes a control section that is adapted to switch one of the switching devices to the forward-facing state only if at least one other light source is not simultaneously supplied with electrical power. The control device can therefore include a control section that is adapted to switch one of the switching devices of a light source to the forward-facing state only if at least one other light source is not simultaneously supplied with electrical power.The control section can therefore be adapted to switch one of the switching elements of a light source to the on state only if at least one other switching element of another light source is in an off state. The switching elements of the light sources can thus each be switched such that at least one of the switching elements is always in an off state. The entirety of the switching elements of all light sources can therefore be switched such that at least one of the switching elements is always in an off state, i.e., that at least one switching element has a switching state different from the other switching states. In an advantageous embodiment of the invention, only one color is switched on at any given time.

[0020] Thus, the invention provides a lighting device for an outdoor area.

[0021] This can involve a "Lighting device"In particular, it can be understood as a device for emitting light, such as a luminaire, a lamp, or a spotlight. Preferably, the lighting device can be a functionally and / or structurally self-contained component, such as a lighting unit. The lighting device is suitable for installation in an outdoor area. "Outdoor area" This could be, for example, a garden, a field, a parking lot, or a body of water. Ideally, the outdoor area should not have any overhang or protection for the lighting fixture. The lighting fixture itself should therefore, for example, have protection against water and foreign objects (e.g., protection according to IP65, IP67, or IP68).

[0022] The lighting device has light sources for emitting light to the outside, which have at least partially different wavelength ranges.

[0023] The light sources are designed to emit light to the exterior and can therefore each, individually or collectively, have a minimum luminous flux to illuminate sufficiently large areas or achieve adequate illuminance levels. For example, the luminous flux of all or some of the light sources can range between 600 and 2000 lumens. The light sources can produce light with at least partially different colors or color spectra.

[0024] One of the light sources can, for example, emit light of only one color or one color spectrum. Alternatively, one of the light sources can emit light of any color or any color spectrum, with the color selection being controlled by a suitable controller.

[0025] The light sources require an electrical power supply for light generation. The lighting fixture has a power supply connection for this purpose.

[0026] This can be under a "Supply of electrical power" This can be understood in particular as the provision and / or supply of electrical power. "Supply connection" It can be understood in particular as a connecting or coupling part.

[0027] The lighting device has a control device connected to the power supply on the input side. The control device is arranged for the timed control of the supply of electrical power to the light source from the power supply.

[0028] One "time control"This can be understood, for example, as specifying or controlling a temporal sequence, duration, or point in time. In particular, the control device can specify, influence, and / or control the start and end times of the electrical power supply to one or more of the light sources.

[0029] The control device is connected to the respective light sources via switching devices on the output side.

[0030] A "Switching device"A switching element can be understood in particular as a component that can assume different component states in response to a switching signal. Preferably, a switching element can be connected to one or more of the light sources. More preferably, at least two switching elements can be provided, each of which is connected to at least one of the light sources. It is also more preferably possible for the lighting device to also include light sources that are not connected to any of the switching elements. The terms "connect" or "Connection" can be understood as an electrical connection in the context of electrical components.

[0031] Each switching device can be switched between at least two states by means of a pulse-width modulated control signal, namely a pass-through state in which at least one connected light source is supplied with electrical power, and a cut-out state in which none of the connected light sources is supplied with electrical power.

[0032] A "pulse width modulated control signal" can be understood in particular as a pulse-duration modulated signal, which has a rectangular pulse signal with a preferably fixed signal frequency (f = 1 / T) and a variable duty cycle. "Permeability state" and the "Separation state"These can be understood, in particular, as two different configurations of the two terminals of the switching device. The conducting state can, for example, correspond to a state in which the two terminals are electrically connected. The disconnected state can, furthermore, correspond, in particular, to a state in which the two terminals are electrically non-conductive or blocked.

[0033] The control device also has a control section that switches one of the switching devices into the on / off state only if at least one other light source is not simultaneously supplied with electrical power.

[0034] The "Control section" This can be understood in particular as a structure, a component and / or a program code, of which at least part of the control function of the power supply can be provided individually or together.

[0035] In this way, it can be achieved that instead of the complete summation of all currents during a period (cf. I_total in ), as is standard practice, Figure 5 ), a reduced number of light sources are supplied with electrical power, thus reducing the current flow during a period.

[0036] By reducing the current during a given period, it becomes possible to reduce the voltage drop caused by line resistance. Accordingly, the lighting device can be installed at a distance from the power supply and operated by, for example, a 24V DC power supply. This also eliminates the need to locate the power supply directly at the lighting device. Instead, it is sufficient to run low-voltage cables to the lighting device and connect it to a low-voltage power supply unit connected to a standard household outlet. Since the invention involves electrical currents that are lower than those used in the prior art, the cross-sectional area of ​​the cables used can also be reduced (in some applications, for example, by a factor of 5).This allows the use of standard components, resulting in cost savings, especially for cable components (in some applications, for example, up to a factor of 3).

[0037] Furthermore, improved color rendering can be achieved because the light sources can be supplied with power on demand. This allows each individual color to utilize maximum power, as well as enabling all colors to combine to achieve optimal maximum power output. Due to the persistence of vision in the human eye, interruptions in the emission of individual colors are negligible. Additionally, demand-based power supply improves thermal management, as the light sources heat up less.

[0038] At the same time, switching-induced frequent current fluctuations can be reduced, resulting in a significant reduction in ripple stress on the power supply (in some applications, for example, by a factor of 5). This can greatly increase the lifespan of the power supplies and simultaneously achieve cost savings, as standard power supplies can be used instead of special types of power supplies with particularly high ripple resistance (cost savings in some applications, for example, by a factor of 2).

[0039] Furthermore, it can be advantageous if the control section is adapted to switch one of the switching devices into the on-state only during a period of parallel PWM control signals using one of the control signals, if another of the control signals does not simultaneously switch another switching device into the on-state.

[0040] To further reduce the electrical current and ripple load, it may be advantageous if the control section is adapted to switch one of the switching devices to the on / off state only when at least two, three, four or any other light sources are not supplied with electrical power simultaneously.

[0041] Alternatively or additionally, the control section can be adapted to convert a number N of parallel pulse-width modulated control signals received on the input side, which within a period each have a high value simultaneously, into N control output signals that can be output on the output side, of which at any given time at least one, preferably two or more up to N-1, of the control output signals has a high value.

[0042] A "High or low value"This can be understood in particular as a high or low signal (5V / 0V). With these configurations, a previously parallel PWM control of the lighting devices can be converted into a serial PWM control of the lighting devices.

[0043] The advantages of this serial conversion can be further illustrated by the following example calculation. If, for example, the control section is designed so that only one of the light sources is supplied with electrical power at any given time, then the total current (I_total) at any given time is only the current I_F through one of the light sources. Maximum power consumption of a single LED: I_F = 0.4A Number of LEDs per light: n = 5 Resulting maximum current per light: I_max_Leuchte = I_F = 0.4A Number of lights on one cable harness: m = 12 Resulting maximum current per cable strand: I_max_strand = m × I_max_luminaire = 4.8A Cable resistance at a cable length of 30m (with copper wire and a wire diameter of 0.85mm): R_line = 1.1 Ohm Resulting voltage drop across the cable harness: U_loss = R_line × I_max_strand = = 5.3V

[0044] The example calculation clearly shows that, unlike previous state-of-the-art systems, a 24V DC power supply is now capable of powering twelve identical LED garden lights via a 30m long copper cable. The garden lights can operate effectively despite the 5.3V voltage drop, as 18.7V remains available for the loads.

[0045] The lighting device can be, for example, a lighting unit, an outdoor light, a garden light, a parking lot light, and / or a path light. Preferably, at least the control device, the light source, and the power supply connection are integrated and / or provided as a single component, whereby the respective components may be interconnected. Alternatively or additionally, at least the control device, the light source, and the power supply connection can be provided within a housing of the lighting device.

[0046] To facilitate the installation and routing of supply lines to the lighting fixture in outdoor areas, and to increase flexibility in choosing the installation location, the lighting fixture can be adapted to be supplied with a DC power supply via its power connection. The supply voltage can preferably be in the low-voltage range. In the low-voltage or extra-low-voltage range, the supply voltage can be, in particular, less than 50V, 48V, 24V, 12V, 6V, 5V, and / or 3V.

[0047] Under a "Low voltage range" In particular, this can be understood as a low-voltage range in which DC voltages do not exceed 120V. Specifically, the low-voltage range can be understood as a voltage range in which continuous contact by humans is not life-threatening.

[0048] For operation of the lighting device with a low-voltage voltage, the lighting device can be adapted to be supplied via the supply connection with an electrical supply power of no more than 200W, 100W, 50W, 48W, 30W, 20W, 10W, 7W, 5W, 3W, 2W, 1.5W, or 1W. Alternatively or additionally, it may be advantageous if the supply connection has a low-voltage connection or a terminal connection for receiving supply lines. Furthermore, and preferably, the supply connection can be adapted to obtain the electrical power from a cable for carrying low voltages.

[0049] For individual color adjustment, the light sources can have at least two, three, four, or five LEDs. Preferably, the light sources can emit at least some light in the visible wavelength range, preferably in a range from 380 nm to 780 nm.

[0050] For example, the light sources can have a blue light emission wavelength range, preferably in the range of 430 nm to 490 nm. Alternatively or additionally, the light sources can have a green light emission wavelength range, preferably in the range of 490 nm to 570 nm. Alternatively or additionally, the light sources can have a red light emission wavelength range, preferably in the range of 640 nm to 780 nm. Alternatively or additionally, the light sources can have a white light emission wavelength range, preferably in the range of 380 nm to 780 nm. Preferably, the light source with the white light emission wavelength range can have a cool white light emission, wherein the emitted light has a color temperature greater than 3500 K, greater than 4000 K, or greater than 5300 K.Alternatively or additionally, the light source with the white light emission wavelength range can have a warm white light emission, whereby the emitted light has a color temperature of less than 3300K.

[0051] In this way, all colors can be produced using the light sources, and color corrections can be made using warm white and / or cool white light sources.

[0052] To generate at least one pulse-width modulated (PWM) control signal as a switching signal for the switching devices, the control device can include a PWM section. The PWM section can include at least one integrated circuit for generating the PWM control signals. This circuit can be, for example, an integrated circuit (IC), a timer, or a microcontroller. Preferably, the PWM section is configured to control the duty cycle of at least one of the PWM control signals. Preferably, the PWM section can include PWM outputs that are connected to signal inputs for connecting PWM control signals to switch the switching devices.

[0053] Preferably, each pulse-width modulated control signal has a fundamental signal frequency f_G and a period T. The pulse-width modulated control signals are preferably in parallel. The expression "parallel control signals"This can be understood in particular as parallel and / or synchronous output. Furthermore, the expression can "parallel control signals" These can also be understood as synchronous signals. The control signals can thus have the same start and end time. The control signals can each be different or at least partially identical. Furthermore, it is conceivable that at least some of the control signals are purely high or low signals. In principle, it is also conceivable that the control signals exhibit other signal forms suitable for the application.

[0054] Preferably, the control signals can be generated in a time step dT, which corresponds to the temporal resolution of the control signal and to a step frequency f_S. Preferably, the step frequency f_S has a frequency of at least 10 kHz, 20 kHz, 30 kHz, 40 kHz, 50 kHz, 60 kHz, 70 kHz, 80 kHz, 90 kHz, or 100 kHz. The period T of the control signal can, for example, be derived from a number of bits N_B of a counter. For instance, a 10-bit counter has 1024 steps, which are traversed at the step frequency f_S. Accordingly, the period T of the control signal is given by T = 2^(N_B) / f_S. Thus, a control signal, for example, for f_S=36kHz and N_B=10, can have a period T = 28.4ms or a fundamental signal frequency f_G=35.2 Hz. In an advantageous embodiment of the invention, higher frequencies can also be used. For example, a 10-bit counter has 1024 steps, which are traversed at the step frequency f_S.Accordingly, the period T of the control signal is given by T = N_B / f_S. Thus, a control signal can, for example, have a period T = 25.6 µs or a fundamental frequency f_G = 39.1 kHz for f_S = 4 MHz and N_B = 10.

[0055] Furthermore, it can be advantageous if the control device includes a communication section, preferably arranged for communication with a communication network. Preferably, the communication section can be adapted to adjust at least one parameter, such as the duty cycle, of at least one of the pulse-width modulated control signals in response to a communication control command from the communication network.

[0056] This allows, for example, the lighting device to be controlled via a remote control or a smartphone. The connection of the communication module to the communication network can be wired or wireless. In the simplest case, the communication module can be a button or a signal line. Alternatively or additionally, a connection via communication networks such as Wi-Fi, Bluetooth, or Bluetooth Mesh is also possible.

[0057] In an implementation of time-controlled power supply, it can be advantageous if the control device has at least one signal input for connecting a pulse-width modulated control signal for one of the switching devices. Preferably, the signal input can be assigned to at least one of the light sources. Furthermore, the control device can have at least one of the switching devices. This switching device can be assigned to at least one of the light sources and have a changeover input for a switching signal to switch between the on / off state and the off state depending on the switching signal. The at least one signal input can be connected to the changeover input for controlling the switching device using one of the pulse-width modulated control signals as the switching signal.

[0058] To control the power supply of each individual light source via one of the switching devices, it can be advantageous to have one signal input and one switching device for each light source. The respective signal input and switching device can be connected to each other. Preferably, the signal inputs and switching devices for the respective light sources can be connected in parallel.

[0059] To convert a previously parallel PWM control of the lighting devices into a serial PWM control of the lighting devices, it can be advantageous if the control section includes at least one logic module with evaluation logic. The logic module can have two logic signal inputs for the evaluation logic and one logic signal output for outputting an evaluation result. Preferably, the evaluation logic can be an XOR logic gate. The logic module can be arranged between a signal input for connecting a pulse-width modulated control signal to one of the switching devices and one of the switching devices. The signal input can be connected to one of the logic signal inputs, and the logic signal output can be connected to a changeover input of the switching device for controlling the switching device.

[0060] This ensures that a high value / high signal is only output to the switching device when two different signals are applied to the logic module.

[0061] Furthermore, it can be advantageous if the logic signal inputs of the logic module are connected to a pair of two different signal inputs and the logic signal output is connected to a switching input of one of the switching devices. One of the signal input pairs and the switching device can each be assigned to the same light source.

[0062] This ensures that the switching device is only switched to the on / off state when two different control signals are applied to the logic module.

[0063] Furthermore, preferably the control section can have at least two logic modules and each logic module can be connected on the input and output sides to a different pair of signal inputs and a different switching device.

[0064] This ensures that at least two different light sources are only switched to the pass-through state if one of the light sources cannot be switched to the pass-through state due to its control signal.

[0065] Furthermore, it can be advantageous if the control device includes a control circuit that has at least one resistor between a signal input for connecting a pulse-width modulated control signal for one of the switching devices and one of the switching devices themselves. This prevents excessive current draw from the signal input as well as oscillations due to parasitic capacitances of the switching device.

[0066] Furthermore, the control circuit preferably includes switching elements, each comprising a MOSFET or transistor. In this way, high switching frequencies can be achieved and high currents can be switched for power supply.

[0067] Furthermore, the control circuit preferably includes at least one XOR gate as a logic component. The XOR gate can be arranged between the signal input and the resistor. This ensures that the switching element is only switched to the on / off state when two different control signals are applied to the XOR gate.

[0068] Alternatively or additionally, it can be advantageous for the control device to have a control circuit with a first signal input connected via a first resistor to a first switching device to supply electrical power to a first light source in response to a first control signal. Furthermore, the control circuit can have a second signal input connected via a first logic module and a second resistor to a second switching device to supply electrical power to a second light source in response to a second control signal. The switching input of the second switching device is connected to the logic signal output of the first logic module, and one of the logic signal inputs of the first logic module is connected to the first signal input, and the other logic signal input is connected to the second signal input.

[0069] In this way, it can be ensured that the light source(s) connected to the second switching device are only supplied with electrical power when the light source(s) connected to the first switching device are not supplied with electrical power. Since the first switching device is not connected to the logic signal output of a logic module, it can be switched independently of the value of the control signal at the second signal input. This allows the control signals to be switched to a high value as before during a period, so that the existing microcontroller controls can still be used with the circuit according to the invention.

[0070] Accordingly, it can be advantageous if the control signal at the first signal input is the last of the control signals to be switched to a high value. The switching time (t_switch) of this control signal within a period (T) can therefore be set to a later time (t_switch) than the switching time (t_switch) of other control signals.

[0071] To implement the control circuit for three additional light sources, it can be advantageous for the control circuit to have a third signal input which is connected via a second logic module and a third resistor to a third switching device in order to supply a third light source with electrical power in response to a third control signal. Preferably, the switching input of the third switching device can be connected to the logic signal output of the second logic module. Furthermore, one of the logic signal inputs of the second logic module can be connected to the second signal input, and the other logic signal input can be connected to the third signal input.The control circuit can further include a fourth signal input, which is connected via a third logic module and a fourth resistor to a fourth switching device in order to supply a fourth light source with electrical power in response to a fourth control signal. The switching input of the fourth switching device can be connected to the logic signal output of the third logic module. Furthermore, one of the logic signal inputs of the third logic module can be connected to the third signal input, and the other logic signal input can be connected to the fourth signal input. The control circuit can also include a fifth signal input, which is connected via a fourth logic module and a fifth resistor to a fifth switching device in order to supply a fifth light source with electrical power in response to a fifth control signal.The switching input of the fifth switching device can be connected to the logic signal output of the fourth logic block. Furthermore, one of the logic signal inputs of the fourth logic block can be connected to the fourth signal input, and the other logic signal input can be connected to the fifth signal input.

[0072] Another aspect of the invention relates to a lighting system. The lighting system comprises at least one of the aforementioned lighting devices. The lighting system further comprises an electrical power supply source and supply lines that connect the lighting device to the power supply source via the supply connection for the transmission of electrical power.

[0073] The lighting system can achieve the same effects and advantages that have already been described in relation to the lighting device according to the invention.

[0074] It can be further advantageous if the power supply source is located at a distance of more than 2m, 5m, 10m, 15m, 20m, 25m, 30m, or 35m from the lighting device. The supply lines can preferably have a length greater than 2m, 5m, 10m, 15m, 20m, 25m, 30m, or 35m. Furthermore, the power supply source can preferably be a DC voltage source, a battery, or a DC power supply unit. The DC power supply unit can preferably be supplied via a household connection with a standard household voltage. The household voltage can be in the range between 50V AC and 300V AC, or it can be 120V AC or 230V AC.

[0075] It can also be advantageous if the power supply is a DC power supply unit for providing a supply voltage in the low-voltage range, where the supply voltage is less than 50V DC. Alternatively or additionally, it can also be advantageous if the supply lines are designed to transmit electrical power of less than 200W, 150W, 100W, 50W, 48W, 30W, 20W, 10W, 7W, 5W, 3W, 2W, 1.5W, or 1W.

[0076] Further advantages, features and details of the invention will become apparent from the following description, in which exemplary embodiments of the invention are described in detail with reference to the drawings. Fig. 1 shows a schematic representation of an embodiment of a lighting device according to the invention and an embodiment of a lighting system according to the invention. Fig. 2Figure 1 shows a schematic representation of an embodiment of a control section of a control device of the lighting device according to the invention. Fig. 3 shows a schematic circuit diagram of an embodiment of a control circuit for a control device of a lighting device according to the invention. Fig. 4 graphically shows the temporal input and output behavior of the control section. Figure 2 and the control circuit Figure 3 , as well as the resulting total current. Fig. 5 graphically shows the temporal input and output behavior of a lighting control system known from the state of the art, as well as the resulting total current.

[0077] The figures show different aspects and views of a lighting device 100 and a lighting system 200 according to the invention.

[0078] The lighting device 100 is designed for outdoor use and can, for example, be a garden light. The lighting device 100 is shown as an example in Figure 1 depicted.

[0079] The lighting device 100 comprises light sources 111, 112, 113, 114, 115, which generate visible light from electrical power. The light thus generated can be emitted to the outside. Figure 1 Figure 1 shows five LEDs as examples of light sources 111-115. However, this is only an example and should not be considered limiting to the invention. For example, several LEDs can be used for each color or shade, not just one. The light sources 111-115 have at least partially different wavelength ranges, so that light in different colors can be emitted from the light sources 111-115. In the example of the Figure 1The lighting device 100 has five different LEDs. The first light source 111 can be a red LED, the second light source 112 a green LED, and the third light source 113 a blue LED. Furthermore, two white LEDs can be provided, which can differ in their color temperature. For example, in Figure 1 A fourth light source 114 is a warm white LED, and a fifth light source 115 is a cool white LED. The light sources 111-115 can be arranged, for example, in a lighting module or in devices for light control, such as a reflector, shade, lenses, etc. (in Figure 1 (not shown).

[0080] To supply the light sources 111-115 with electrical power, the lighting device 100 has a supply connection 120. In particular, the supply connection 120 can be adapted to receive and transmit a supply voltage from an external power supply source 250. The supply connection 120 is in Figure 1 e.g., shown as a cable connection for receiving supply lines 241, 242. The supply connection 120 can be used to supply the light sources 111-115 directly or indirectly ( Figure 1 ) be electrically connected. Preferably, the supply connection 120 can be mechanically connected to the light sources 111-115.

[0081] The supply connection 120 can be adapted to the characteristics of the power supply source 250. For example, the power supply source 250 can be a DC power supply circuit 252, providing a low-voltage supply voltage. Preferably, the supply voltage can be a DC voltage of less than 50 V or 24 V. The supply connection 120 can be designed as a low-voltage DC connection. If the supply connection 120 is, for example, a terminal block, it can be equipped with only the minimum technical features necessary for a safe connection of a low-voltage voltage. The supply connection 120 can also be designed for smaller wire diameters than, for example, a connection for a line carrying a mains voltage (e.g., 230 V AC). The conductor cross-sections are therefore comparable, approximately 1 to 1.5 mm².The supply connection 120 can also be designed for receiving and transmitting electrical supply power in the range of 1W to 200W.

[0082] The lighting device 100 includes a control device 130 for the time-controlled supply of power to the light sources 111-115 from the supply connection 120. The control device 130 is in Figure 1 and in parts in Figures 2 and 3The control device 130 is shown by way of example. It can consist of one or more parts, such as a microcontroller and a control circuit. Preferably, the control device 130 can be mechanically connected to the power supply connection 120 and / or to the light sources 111-115. Preferably, the control device 130 has the power supply connection 120. The control device 130 preferably has inputs and outputs for receiving and outputting electrical power from the power supply connection 120, as well as an intermediate control of the power output.

[0083] On the input side, the control device 130 is connected to the supply connection 120. In Figure 1Two supply connection lines 121, 122 are shown as examples, extending from the supply connection 120 within the control device 130. Preferably, the supply connection lines 121, 122 can each have the same polarity (positive pole / negative pole) as the supply lines 241, 242.

[0084] On the output side, the control device 130 is connected to the respective light sources 111-115 via switching device 132. Figure 1 This illustrates, by way of example, that each light source 111-115 is connected to the control device 130. Furthermore, the light sources 111-115 can be directly connected to the control device 130 via one of the supply lines 121, 122. However, it is also conceivable that at least one supply line 241, 242 is directly connected to the light sources 111-115.

[0085] The switching devices 132 are components, such as a transistor or MOSFET, that can be switched between different states by means of a switching signal. The switching devices 132 can each be switched between a forward state DZ and a reverse state TZ by means of a pulse-width modulated switching signal. Figure 1 This is shown by way of example. Preferably, the switching device 132 can have a switching input for a switching signal in order to switch between the on state DZ and the off state TZ depending on the switching signal. This is particularly evident from the exemplary illustrations of the Figures 1 to 3 stand out.

[0086] The switching devices 132 allow, in the forward-biased state DZ, power transmission from the supply terminal 120 to one of the respective light sources 111-115. A circuit in the forward-biased state DZ is, for example, in Figure 1shown for the uppermost switching device 132. In the disconnect state TZ, however, no power transfer from the supply connection 120 to any of the respective light sources 111-115 is possible. Figure 1 Four of the switching devices 132 are shown in the disconnect state TZ. Preferably, as also shown in Figure 1 shown, each switching device 132 can be assigned to one of the light sources 111-115, so that each light source 111-115 can be controlled by one of the switching devices 132 with respect to power transmission.

[0087] The control device 130 uses pulse-width modulated control signals SES1, SES2, SES3, SES4, and SES5 as switching signals to specify a switching state of the switching devices 132. Examples of the waveforms of the control signals SES1-SES5 can be found in the diagram. Figure 4 and 5The control signals SES1-SES5 can preferably be output in parallel. In other words, the control signals SES1-SES5 can be synchronized and output simultaneously. Preferably, the control signals SES1-SES5 can each have a rising edge to a high value (e.g., 5V) and, at the end of a period T, a falling edge to a low value (e.g., 0V). Furthermore, preferably, dimming of the light sources 111-115 can also be implemented, for example, by providing a dimming interval DI before the start of the first high edge.

[0088] The control signals SES1-SES5 can be generated outside or inside the control device 130. Figure 1Figure 1 shows an example of the generation of the control signals SES1-SES5 within the control device 130 in a PWM section 134. The PWM section 134 can have a corresponding number of PWM outputs via which the PWM control signals SES1-SES5 can be output. The PWM outputs are in Figure 1 indicated by five circles, from which the control signals SES1-SES5 originate. The PWM section 134 can, for example, be part of a microcontroller, an IC, or a timer.

[0089] The control device 130 further comprises a control section 131, which is adapted to switch one of the switching devices 132 to the on-state DZ only if at least one other light source 111-115 is not simultaneously supplied with electrical power. The control section 131 is shown schematically in the illustrative examples of Figure 1 and 2 shown.

[0090] Figure 3shows an embodiment of the control section 131 as a circuit. Figure 4 shows an example of input and output behavior for control section 131. Figure 3 .

[0091] The control section 131 can have signal inputs 1311, 1312, 1313, 1314, 1315, into which the control signals SES1-SES5 for switching the switching devices 132 are received. This is, for example, in the Figures 1 to 3 shown. A signal input 1311-1315 can, for example, be a software variable, an input interface, or a signal input of a circuit. Preferably, each signal input 1311-1315 can be directly or indirectly connected to a switching input of a switching device 132. This is shown by way of example in the Figures 2 and 3shown, in which the signal input 1311 is directly connected to the switching input of the switching device 132. In contrast, the signal inputs 1312-1315 are only indirectly connected to the switching input of the switching device 132. Furthermore, the Figures 1 to 3 It can be deduced that preferably one signal input 1311-1315 is assigned to a switching device 132 and one light source 111-115, thus forming a module. The individual modules can then be arranged in parallel with each other.

[0092] The control section 131 can convert the input control signals SES1-SES5 into output control signals SAS1, SAS2, SAS3, SAS4, SAS5, which can then be output by the control section 131 as adapted switching signals to the respective switching devices 132. This is shown schematically in Figure 1 depicted. Figure 4This shows an example of such a conversion of the control signals SES1-SES5 using control section 131. Figure 4Five control signals SES1-SES5 are shown, each exhibiting a high value simultaneously within a period T. The control section 131 can be configured such that the control signals SES1-SES5 are converted into the control output signals SAS1-SAS5, whereby at most one of the control output signals SAS1-SAS5 exhibits a high value at any given time. Accordingly, it can be ensured that one of the switching devices 132 is switched to the on state DZ only when every other light source 111-115 is not simultaneously supplied with electrical power. Preferably, the high edge of one control output signal SAS1-SAS5 and the low edge of another control output signal SAS1-SAS5 can occur simultaneously.The control section can therefore be adapted such that one of the switching devices 132 is only switched to the on-state DZ during a period T of the parallel control signals SES1-SES5 by means of one of the control signals SES1-SES5 if another of the control signals SES1-SES5 does not simultaneously switch another switching device 132 to the on-state DZ.

[0093] For such a conversion of the control signals SES1-SES5 into the control output signals SAS1-SAS5, the control section 131 can, for example, include a logic module 133 with evaluation logic. In the Figures 1 to 4The use of XOR logic as evaluation logic is shown as an example. The logic module 133 can have two logic signal inputs A and B and one logic signal output Y for outputting the evaluation result. The logic module 133 can then be arranged between a signal input 1311-1315 and one of the switching devices 132 and connected to at least one signal input 1311-1315 on the input side and to the switching input of the switching device 132 on the output side. The XOR logic ensures that an output is only logically "1" if its two inputs have different logical states.

[0094] Accordingly, it can be achieved that the control section 131 switches a switching device 132 only if a control signal SES1-SES5 has a low value and another control signal SES1-SES5 applied to the same logic module 133 has a high value. In an advantageous embodiment of the invention, all inputs SES1 to SES5 can also have high values; in this case, only output SAS1 is high.

[0095] Preferably, the logic signal inputs A, B of the logic module 133 can be connected to a pair of different signal inputs 1311-1315 in order to switch one of the switching devices 132 via the logic signal output Y. In the Figure 2 and 3 The logic modules 133 are preferably connected to different pairs of signal inputs 1311-1315 and to different switching devices 132.

[0096] Figure 3Figure 1 shows an example of the implementation of the control section 131 as a control circuit 135. Preferably, the control section 131 can be provided structurally separately from the PWM section 134. Thus, the control section 131 can be provided as a circuit board or integrated circuit, and the PWM section 134 as a microcontroller, with the control section 131 and the PWM section 134 being interconnected via the signal inputs 1311-1315.

[0097] The control circuit 135 from Figure 3 It has a first signal input 1311, which is connected via a first resistor 1351 to a first switching device 132 in order to supply a first light source 111 with electrical power in response to a first control signal SES1. In the example of the Figure 3 A red LED is controlled via the first control signal SES1.

[0098] The control circuit 135 further comprises a second signal input 1312, which is connected via a first logic module 133 and a second resistor 1352 to a second switching device 132 in order to supply a second light source 112 with electrical power in response to a second control signal SES2. The switching input of the second switching device 132 is connected to the logic signal output Y of the first logic module 133. The logic signal input B of the first logic module 133 is connected to the first signal input 1311, and the logic signal input A is connected to the second signal input 1312. In the example of the Figure 3 A green LED is controlled by the second control signal SES2.

[0099] The control circuit 135 further comprises a third signal input 1313, which is connected via a second logic module 133 and a third resistor 1353 to a third switching device 132 in order to supply a third light source 113 with electrical power in response to a third control signal SES3. The switching input of the third switching device 132 is connected to the logic signal output Y of the second logic module 133. The logic signal input B of the second logic module 133 is also connected to the second signal input 1312, and the logic signal input A is connected to the third signal input 1313. In the example of the Figure 3 A blue LED is controlled by the third control signal SES3.

[0100] The control circuit 135 further comprises a fourth signal input 1314, which is connected via a third logic module 133 and a fourth resistor 1354 to a fourth switching device 132 in order to supply a fourth light source 114 with electrical power in response to a fourth control signal SES4. The switching input of the fourth switching device 132 is connected to the logic signal output Y of the third logic module 133. Furthermore, the logic signal input B of the third logic module 133 is connected to the third signal input 1313, and the logic signal input A is connected to the fourth signal input 1314. In the example of the Figure 3 The fourth control signal, SES4, controls a warm white LED.

[0101] The control circuit 135 further comprises a fifth signal input 1315, which is connected via a fourth logic module 133 and a fifth resistor 1355 to a fifth switching device 132 in order to supply a fifth light source 115 with electrical power in response to a fifth control signal SES5. The switching input of the fifth switching device 132 is connected to the logic signal output Y of the fourth logic module 133. Furthermore, the logic signal input B of the fourth logic module is connected to the fourth signal input 1314, and the logic signal input A is connected to the fifth signal input 1315. In the example of the Figure 3 The fifth control signal, SES5, controls a cool white LED.

[0102] Figure 4This illustrates the function of control section 131 and control circuit 135 as follows: After the dimming interval DI has elapsed, the control signal SES5 is first switched to a high value. Since the control signal SES4 is still low at the same time, the fourth switching device 132 is switched to the on state DZ, so that the cool white LED is supplied with power. The other control signals SES1-SES3 are also all low, so the logic modules 133 each output a low value and thus switch the connected switching devices 132 to the off state TZ. The first switching device 132 is accordingly also in the off state TZ.If a high edge occurs in the fourth control signal SES4, resulting in two identical high values ​​at the fourth logic module 133, the logic output Y of the fourth logic module 133 switches to a low value. This terminates the power supply to the cool white LED due to the fifth switching device 132 entering the disconnect state TZ. Simultaneously, however, a change occurs at the logic output Y of the third logic module 133, as its logic signal inputs A and B now contain two different values. Consequently, immediately after the high edge occurs in the fourth control signal SES4, only the warm white LED receives power. The other control signals SES1-SES3 remain unchanged, so the switching devices 132 retain their previous switching state (disconnect state TZ). This process is repeated accordingly for all control signals SES1-SES5 until finally a high edge occurs at the first control signal SES1.This sets the logic signal output Y of the first logic block 133 to a low value and simultaneously, since the first signal input 1311 is directly connected to the switching device 132, supplies power to the red LED, as the first switching device 132 is switched to the on state DZ. At the end of period T, all control signals SES1-SES5 are switched to a low value, so that the same (low) signal is present at all logic signal inputs A,B of all logic blocks 133. Accordingly, all switching devices 132 are switched to an off state TZ by the logic signal output Y. As a result, a constant current I_total is established over one period T.

[0103] Preferably, the control device 130 can further include a communication section 160 for communication with a communication network 630. For example, the control device 130 can include a transceiver 161 or internet port for connection to the communication network 630. Preferably, communication control commands KB can be received from the communication network 630 via the communication section 160, which can be used, for example, to adjust parameters of the control signals SES1-SES5. For example, the duty cycle for one or more of the control signals SES1-SES5 can be changed to set a new color or continuous emission of warm white or cool white light.

[0104] Figure 1Figure 1 further shows an example of the lighting system 200 according to the invention. In addition to the DC power supply 251, this system also includes supply lines 241 and 242 for transmitting electrical power. The lighting device 100 is connected to the DC power supply 251 via the supply lines 241 and 242 for its electrical power supply and is arranged at a distance from the DC power supply 251. The lighting system 200 can include a remote control device 260, such as a remote control, a tablet, or a smartphone, by means of which the lighting device 100 can be controlled. For example, the user can select a color or an illuminance and transmit this selection to the control device 130 via the communication network 630 in order to make these settings on the lighting device 100.

[0105] The preceding explanation of the embodiments describes the present invention solely by way of examples. Naturally, individual features of the embodiments can be freely combined with one another, provided this is technically feasible, without departing from the scope of the present invention. Reference symbol list

[0106] 100 Lighting device 111 to 115 Light source 111 First light source, Red 112 Second light source, Green 113 Third light source, Blue 114 Fourth light source, WW 115 Fifth light source, CW 120 Supply connection 121, 122 Supply connection cable 130 Control device 131 Control section 1311 to 1315 Signal input 132 Switching device 133 Logic block, XOR gate 134 PWM section 135 Control circuit 1351 to 1355 Resistor 160 Communication section 161 Communication interface, transceiver 200 Lighting system 241, 242 Supply cable 250 Power supply source 251 DC power supply 252 DC power supply circuit 260 Remote control device 630 Communication network KB Communication control command A, B Logic signal input Y Logic signal output TZ Disconnect state DZ Pass-through state SAS1 to SAS5 Control output signal SES1 to SES5 Control signal SES1, PWM_Red First control signal SES2, PWM_Green Second control signal SES3, PWM_Blue Third control signal SES4,PWM_WW fourth control signal SES5, PWM_KW fifth control signal T period duration t time (time axis) DI dimming interval I_total total current,

Claims

1. Lighting device (100) for an outdoor area, comprising: - light sources (111, 112, 113, 114, 115) for generating light from electrical power for emission to the outdoor area, wherein the light sources (111, 112, 113, 114, 115) have at least partially different wavelength ranges, - a supply connection (120) for supplying the light sources (111, 112, 113, 114, 115) with electrical power, and - a control device (130) for time-controlled supply of the light sources (111, 112, 113, 114, 115) with electrical power from the supply connection (120), wherein the control device (130) is connected on the input side to the supply connection (120) and on the output side to the respective light sources (111, 112, 113, 114, 115). 114, 115) is connected via switching means (132), wherein the switching means (132) are each controlled by means of a pulse width modulated control signal (SES1, SES2, SES3, SES4, SES5) between a pass state (DZ),in which the supply connection (120) and the respective light sources (111, 112, 113, 114, 115) connected to the switching device (132) are connected for the supply of electrical power, and a disconnect state (TZ) in which the supply connection (120) and the respective light sources (111, 112, 113, 114, 115) are disconnected, are switchable, . characterized by a control section (131) adapted to switch one of the switching devices (132) into the pass-through state (DZ) only when at least one other light source (111, 112, 113, 114, 115) is not simultaneously supplied with electrical power.

2. Lighting device (100) according to claim 1, wherein the lighting device (100) is a lighting unit, an outdoor light, a garden light, a parking lot light, and / or a path light.

3. Lighting device (100) according to claim 1 or claim 2, wherein the lighting device (100) is adapted to be supplied with a supply voltage via the supply connection (120) from a DC supply circuit (252), wherein the supply voltage is preferably a voltage in the low voltage range, wherein the supply voltage is preferably less than 50V, 48V, 24V, 12V, 6V, 5V and / or 3V.

4. Lighting device (100) according to one of the preceding claims, wherein the lighting device (100) is adapted to be supplied via the supply connection (120) with an electrical supply power of at most 200W, 150W, 100W, 50W, 48W, 30W, 20W, 10W, 7W, 5W, 3W, 2W, 1.5W, or 1W.

5. Lighting device (100) according to one of the preceding claims, wherein the supply connection (120) has a low-voltage connection, a terminal connection for receiving supply lines (241, 242), and / or wherein the supply connection (120) is adapted to obtain the electrical power from a cable for carrying low voltages.

6. Lighting device (100) according to one of the preceding claims, wherein the light sources (111, 112, 113, 114, 115) comprise at least two, three, four or five LEDs, wherein preferably the light sources (111, 112, 113, 114, 115) emit at least partially light in the visible wavelength range, preferably in a range of 380nm to 780nm.

7. Lighting device (100) according to one of the preceding claims, wherein the control section (131) is adapted to switch one of the switching means (132) only into the pass-through state (DZ) when at least two, three, four or each other light source (111, 112, 113, 114, 115) are not supplied with electrical power simultaneously.

8. Lighting device (100) according to one of the preceding claims, wherein the control section (131) is adapted to convert a number N of input pulse-width modulated control signals (SES1, SES2, SES3, SES4, SES5), which within a period (T) simultaneously exhibit a high value, into N output control output signals (SAS1, SAS2, SAS3, SAS4, SAS5), of which at any given time at least one, preferably two or more up to N-1, of the control output signals (SAS1, SAS2, SAS3, SAS4, SAS5) exhibits a high value.

9. Lighting device (100) according to one of the preceding claims, wherein the control device (130) comprises: - at least one signal input (1311, 1312, 1313, 1314, 1315) for connecting a pulse-width modulated control signal (SES1, SES2, SES3, SES4, SES5) for one of the switching means (132), wherein preferably the signal input (1311, 1312, 1313, 1314, 1315) is assigned to at least one of the light sources (111, 112, 113, 114, 115), and - at least one of the switching means (132), wherein the switching means (132) is assigned to one of the light sources (111, 112, 113, 114, 115) and has a switching input for a switching signal in order to control the lighting depending on to switch the switching signal between the pass state (DZ) and the cut state (TZ), wherein the signal input (1311, 1312, 1313, 1314, 1315) is connected to the switching input for controlling the switching device (132) (132) by means of one of the pulse width modulated control signals (SES1, SES2, SES3, SES4,SES5) is connected to the switching signal.

10. Lighting device (100) according to claim 9, wherein a signal input (1311, 1312, 1313, 1314, 1315) and a switching means (132) are arranged for each light source (111, 112, 113, 114, 115) and are connected to each other, wherein preferably the signal inputs (1311, 1312, 1313, 1314, 1315) and the switching means (132) for the respective light sources (111, 112, 113, 114, 115) are each arranged in parallel connection with each other.

11. Lighting device (100) according to one of the preceding claims, wherein the control section (131) comprises: - at least one logic module (133) with an evaluation logic, which has two logic signal inputs (A, B) for the evaluation logic and one logic signal output (Y) for outputting an evaluation result, wherein the evaluation logic preferably comprises an XOR logic, wherein the logic module (133) is arranged between a signal input (1311, 1312, 1313, 1314, 1315) for connecting a pulse-width modulated control signal (SES1, SES2, SES3, SES4, SES5) for one of the switching means (132) and one of the switching means (132), wherein the signal input (1311, 1312, 1313, 1314, 1315) is connected to one of the logic signal inputs (A, B) is connected and the logic signal output (Y) is connected to a switching input of the switching device (132) for controlling the switching device (132).

12. Lighting device (100) according to claim 11, wherein the logic signal inputs (A, B) of the logic module (133) are connected to a pair of two different signal inputs (1311, 1312, 1313, 1314, 1315) and the logic signal output (Y) is connected to a switching input of one of the switching means (132), wherein one of the pair of signal inputs (1311, 1312, 1313, 1314, 1315) and the switching means (132) are each assigned to an identical light source (111, 112, 113, 114, 115), wherein preferably the control section (131) has at least two logic modules (133) and each logic module (133) is connected on its input and output sides to a different pair of signal inputs (1311, 1312, 1313, 1314, 1315) and a different switching device (132).

13. Lighting device (100) according to one of the preceding claims, wherein the control device (130) comprises a control circuit (135), the control circuit (135) comprising: - at least one resistor (1351, 1352, 1353, 1354, 1355) between a signal input (1311, 1312, 1313, 1314, 1315) for connecting a pulse-width modulated control signal (SES1, SES2, SES3, SES4, SES5) for one of the switching means (132) and one of the switching means (132), and - the switching means (132), each comprising a MOSFET and / or transistor, and - preferably at least one XOR gate (133) as a logic element (133), wherein the XOR gate (133) is further preferably connected between the signal input (1311, 1312, 1313, 1314, 1315) and the resistance (1351, 1352, 1353, 1354, 1355).

14. Lighting device (100) according to one of the preceding claims, wherein the control device (130) has a PWM section (134) for generating at least one pulse-width modulated control signal (SES1, SES2, SES3, SES4, SES5) as a switching signal for the switching means (132), wherein the PWM section (134) has PWM outputs which are preferably connected to signal inputs (1311, 1312, 1313, 1314, 1315) for connecting a pulse-width modulated control signal (SES1, SES2, SES3, SES4, SES5) for the switching means (132).

15. Lighting system (200) for an outdoor area, comprising: - a DC power supply unit (251) for providing a supply voltage in the low-voltage range, in which the supply voltage is a DC voltage less than 50V, and - supply lines (241, 242) for transmitting electrical power less than 150W, wherein the supply lines (241, 242) have a length of at least 5m, characterized by- a lighting device (100) according to one of the preceding claims, which is connected to the DC power supply unit (251) via the supply lines (241, 242) for the supply of electrical power and which is arranged at a distance from the DC power supply unit (251).

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