WO2016131605A1 - Brightness control for a light signal system - Google Patents

Brightness control for a light signal system Download PDF

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Publication number
WO2016131605A1
WO2016131605A1 PCT/EP2016/051291 EP2016051291W WO2016131605A1 WO 2016131605 A1 WO2016131605 A1 WO 2016131605A1 EP 2016051291 W EP2016051291 W EP 2016051291W WO 2016131605 A1 WO2016131605 A1 WO 2016131605A1
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WO
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Prior art keywords
signal
unit
voltage
light
modulation
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PCT/EP2016/051291
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German (de)
French (fr)
Inventor
Stefan Baumann
Robert Runge
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Siemens Aktiengesellschaft
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B37/00Circuit arrangements for electric light sources in general
    • H05B37/02Controlling
    • H05B37/0209Controlling the instant of the ignition or of the extinction
    • H05B37/0245Controlling the instant of the ignition or of the extinction by remote-control involving emission and detection units
    • H05B37/0263Controlling the instant of the ignition or of the extinction by remote-control involving emission and detection units linked via power line carrier transmission

Abstract

The invention relates to a circuit arrangement (41, 41a, 41b, 41c, 41d) for adjusting the brightness of signal transmitters (43a, 43b, 43c) of a light signal system (40). The circuit arrangement (41, 41a, 41b, 41c, 41d) has a voltage supply interface (15) and a voltage conversion unit (14) for generating a carrier signal (SIG) by converting an electrical voltage (Vsupp) applied at the voltage supply interface (15) into an electrical voltage (Vsig) of a carrier signal (SIG). In addition, the circuit arrangement (41, 41a, 41b, 41c, 41d) has a control data receiving unit (46) for receiving a control signal, wherein the control signal (S) comprises information regarding a brightness to be adjusted of the light signal system (40). Furthermore, the circuit arrangement (41, 41a, 41b, 41c, 41d) has a modulation signal generating unit (44) for generating a modulation signal (MD) in accordance with the received control signal (S) and a modulator unit (45) for modulating the carrier signal (SIG) using the modulation signal (MD). The invention also relates to a light signal system (40). The invention further relates to a method (100) for adjusting the brightness of a light signal system (40).

Description

description

Brightness control of a light signal system The invention relates to a circuit arrangement for adjusting the brightness of signaling devices of a light signal system. In addition, the invention relates to a traffic signal. Furthermore, the invention relates to a method for adjusting the brightness of a light signal system.

Traffic signals, also called traffic light system, the control of the road traffic act. Arrange for transport ¬ subscriber to a particular behavior by controlled light signals are emitted. These comparable difference like the shape and color of traffic signs each have a different meaning and radiate only as against the direction of the controlled traffic. The use of traffic signals has different reasons, for example to improve the traffic flow and traffic situations dangerous or danger-prone comparison to defuse. In road traffic these are in particular junctions and bottlenecks, for example at construction sites or bridges. In response to the change of the ruling in the respective traffic signal lighting conditions the reasonable from the traffic lights showed light signals are better or worse to detect. In particular, at about the time of the day fluctuating light conditions ¬ Nissen, thus for example arranged in outdoor light ¬ signaling systems, there is a need, the brightness of the signal ¬ encoder of the traffic signal Nit to the respective light conditions adapt. For example, to dim power switch may be interpreted slightly off in strong sunlight during the day and at night too luminous signal transmitter can greatly dazzle road users. Thus, there is for traffic lights the request that

to change brightness of the signal transmitter to suit the ambient brightness. Further, electrical energy can be saved by adjusting the brightness of the signal generator because the light signals do not have to shine so bright at night to be well recognized and distinguished to. The change in the brightness of the lighting units is also called dimming.

So far, the dimming of light signal systems has been achieved in that the voltage with which the signal generators have been operated, could be varied by the controller in one or more stages. Typical operating voltages are, for example, 230 for full brightness and 150V for reduced brightness. In particular, in the use of incandescent lamps for the signal transmitter, such a procedure is particularly easy to implement, as the incandescent lights automatically dark at low voltage. The brightness of light emitting diodes on the other hand is dependent on the amperage of the current flowing through them electrically. When auto switches with LEDs, therefore, an additional LED driver logic must be installed, which recognizes the lower supply voltage and the current is reduced by the LEDs so that the light output decreases.

In both cases, the dimming is implemented centrally by different supply voltages for different Hellig ¬ possibilities of auto switches conventional. Refer to the voltage supply unit of the traffic signal at least one additional transformer or more power supplies are installed and it is switched between the voltages of different voltage converter to obtain different supply voltages ¬ for different brightnesses.

The additional voltage transformers are costly and take a lot of space. There is also conventional with an optional dimming function is always the need for additional hardware, ie install an additional voltage converter into the traffic signal, even if the dimming function is not needed. It is therefore an object of the present invention to develop a circuit arrangement for a light signal system with dimming-functional, that is, more flexible and space-saving built economically.

This object is achieved by a circuit arrangement according Pa ¬ tentanspruch 1, by a light signaling system according to claim 13 and a method for adjusting the brightness of a light system according to claim fourteenth

The circuit arrangement according to the invention for adjusting the brightness of signaling devices of a light signal system comprises egg ¬ ne power supply interface for receiving an electrical supply voltage. Can supply interface check the voltage such as a power supply for a supply voltage, such as a 230V AC voltage ¬ be.

The circuit arrangement according to the invention also has a voltage conversion unit for generating a carrier signal by converting the electrical supply voltage into a voltage of a carrier signal. Under a voltage conversion unit is a unit understood ¬ to which converts an electrical voltage in an electrical voltage having a different voltage value or a different voltage. In the conversion process of elekt ¬ step supply voltage into a voltage of a carrier signal, for example an AC voltage with a specific voltage value can be converted into an AC voltage having a different voltage value or an AC voltage is converted into a DC voltage, or vice versa.

The circuit arrangement according to the invention further comprises a control data receiving unit for receiving a

Control signal, said control signal summarizes information regarding an adjusted brightness of the light signal system to ¬. The circuit arrangement according to the invention includes a modulated signal generating unit for generating ei ¬ nes modulation signal in response to the received control signal to the outside. For example, the modulation signal generating unit with the control data receiving unit is electrically connected to or includes the control data receiving unit to receive the control signal from the Steuerungsda ¬ th receiving unit and to generate a modulation signal in response to the detected control command.

The circuit arrangement according to the invention also comprises a modulator unit for modulating the carrier signal with the Mo ¬ dulationssignal to a modulated control signal for controlling the brightness of the signal transmitter. For example, the modu ¬ latoreinheit is electrically connected to the modulation unit to receive the modulation signal therefrom. Furthermore, the modulator unit is also at least indirectly electrically connected to the voltage conversion unit to receive therefrom the carrier signal, which is converted in the modulator unit together with the modulation signal into a control signal. The aim is to include all types of units that can combine two signals together in such a way that the two signals are broken down again in their outputs Kings ¬ nen the term modulator unit. The modulator unit is to say in particular also can be a switch which is controlled by the modulating signal and the carrier signal modulated by this switching process.

a unit is understood to mean a signal transmitter in conjunction with the inventiveness circuit configuration according to which outputs a signal a can be interpreted for them relevant information acquired by external devices or persons, such as road-users and with respect. For example, the signal from a signal transmitter comprises an instruction or a warning which can be understood and processed by the affected persons or devices. By performing, in the inventive circuit arrangement of the control of the signal transmitter by means of a modulated supply voltage, additional channels for a ge ¬ singled data transmission can be saved once for controlling the signal transmitter. In addition, as compared with the conventional

Circuit arrangements in which the actuation of the signal generator is performed using a plurality of transformers or voltage transformers, at least to save a part of this costly and space-consuming components.

The light system according to the invention has the Invention ¬ circuit arrangement according to adjust the brightness of signaling devices of a light signal system. The erfindungsge ¬ Permitted circuit arrangement comprises a signal generation means, having a plurality of signal generators, each signal generator includes a demodulation unit, which is adapted to receive a modulated signal from the circuit ¬ arrangement and demodulating into a modulation signal and a carrier signal. The switches are so designed as so-called intelligent signal generator, which he ¬ possible, via modulation of the supply voltage digital telegrams or states from the controller, ie the inventive circuitry to send the signal transmitter. Depending on the information content of the digital tele- legramms intelligent control regulates the light output in the siren. Part of the intelligent signal generator is also a demodulator, which analyzes the signal received by the control signal modulated in such a way that the information given by the brightness of the signal transmitter can be detected by the signal transmitters and processed further on.

Furthermore, the light system according to the invention also includes a signal transmitter switching unit which is connected between the scarf ¬ processing arrangement and the signal generation means and is adapted to switch between different signal ¬ donors. For example, it is in the individual auto switches warning lights with different meanings. The sensor control unit is now einge- to directed to switch between the different warning lights to output various warning information or instructions. In the inventive method for adjusting the brightness of a traffic signal, a control signal are received, ¬ gene, wherein the control signal comprises an adjusted brightness of the light signal system. Furthermore, a Trägersig ¬ nal is generated by converting a supply voltage to an elec- generic voltage of a carrier signal. In addition, a modulation signal in response to the received control signal is generated ¬ and modulates the carrier signal with the modulation signal to a modulated control signal for controlling the brightness of the signal transmitter.

The essential components of the circuit arrangement according to the invention for adjusting the brightness of signaling devices of a light signal system can be formed for the most part in the form of software components. This concerns in particular the modulation signal generation unit and the Mo ¬ dulator unit. In principle, however, these components may also partly, particularly when it comes to very fast loading ¬ bills, in the form of software-supported hardware such as FPGAs or the like to be realized. Likewise as the required interfaces, for example, be when it's all about a takeover of data from other Softwarekompo ¬ components, designed as a software interface can. but they can also be configured as hardware built interfaces which are controlled by appropriate software.

A largely software implementation has the advantage that circuits have been used to adjust the brightness of a light signal signal transmitters anläge easily can be upgraded ¬ nachge by a software update to work in the inventive manner. Insofar as the object is also achieved by a computer program product directly loadable into a Speicherein- direction of a light signal system, with Programmab cut ¬ to perform all the steps of the inventive method when the program is executed in the traffic signal.

The dependent claims and the following description each contain particularly advantageous embodiments and developments of the invention. The demands of a particular category of claim can also be analogous to the dependent claims of another category of claim weiterge ¬ forms. In addition, in the invention, the various features of different embodiments and claims may also be combined to new embodiments.

Preferably the circuit arrangement according to the invention comprises egg ¬ NEN additional switch between the Spannungswandlungsein- uniform and the modulator unit. The additional switches can be used for connecting and disconnecting the circuit from the supply voltage or the carrier voltage.

In a preferred embodiment of the circuit arrangement according to the invention, the modulation signal generating unit is adapted to generate a modulation signal a sine wave signal. A sinusoidal signal can be used for example for frequency modulation of a carrier signal. The information to be transmitted is included in the modulated frequency of the carrier signal. For example, the sinusoidal signal for setting a normal brightness can have a frequency of 1 kHz and having a frequency of 2 kHz for a weaker brightness.

The frequencies are in principle freely selectable, are in practice usually in the order of 100 Hz to 10 kHz ma ¬ ximal. Also, the frequency deviation, ie the difference between the two modulation frequencies is arbitrary. However, the correct demodulation in the signal sensor with small nem frequency deviation is more complex, so that a sufficient frequency shift is preferred.

In addition, the modulation is not limited only to sine or legality eckfunktionen. Just as well could be a signal of a triangular shape, a saw or any other arbitrarily selectable waveform be used.

Alternatively, the modulation signal generating unit may be adapted to generate a modulation signal is a square wave signal.

In a particularly preferred embodiment of the circuit arrangement according to the invention the modulator unit is controlled such that for setting a normal Hellig ¬ ness no square-wave signal is modulated and a schwä ¬ chere brightness modulation of the electric voltage of the signal generator with a square wave with a frequency of 1 kHz is carried out. For example, the modulation can be tion device controlled such that it outputs a non-zero signal to the Modulatorein ¬ integrated only during the time periods during which the brightness is dimmed. In a particularly simple to implement variant of the circuit arrangement, the modulator unit is designed as a simple switch. The switch may, for example, as a commercially available high-side switch to be realized (from the smart high-side switch family from Infineon). In this case, the switch is driven with the aid of the modulation signal of the modu ¬ lationseinheit and switched according to the amplitude of the modulation signal. In this way, for example, a square-wave signal with the frequency of the modulation signal and the amplitude of the carrier signal are generated as a control signal for controlling the signal transmitter.

In a particularly practical embodiment of the circuit arrangement according to the invention the voltage conversion unit is adapted to transform the supply voltage into a DC electric power of a carrier signal. To be modulated carrier signal is in this case as

DC voltage signal is formed.

In addition, the inventive circuit arrangement can have a setting amplitude swing, which is to be ¬ directed to adjust an amplitude of the modulated control signal. By setting the amplitude of the modulated control signal Herten the efficiency and Störfes ¬ ACTION the signal transmission can be adjusted. In this way, the arrangement of specific environmental conditions and requirements can be customized. The amplitude swing setting unit may, for example, a Dio ¬ dens treks or have a longitudinal regulator, which bridges the modulator unit. In other words, the components of the amplitude swing setting the modulator ¬ unit which forms excluded in particular as a simple switch to be is connected in parallel, so that even in the phase in which the switch closes, a signal at the output of the circuit arrangement according to the invention is applied, wherein the amplitude of which depends on the impedance of the components of the amplitude swing setting.

The circuit arrangement according to the invention may also have a clock control unit in a particularly energy-saving variant which is adapted to determine a pulse duty ratio ¬ with which the carrier signal with the modulation signal is modulated tion. In this case, preferably, the circuit arrangement also includes a signal multiplication unit or a mixer unit which is adapted to mix a signal generated from the clock control unit clock signal with the Modulati ¬ onssignal to multiply in particular. The duty cycle of the clock signal determines the time period for which the carrier signal is modulated. For example, it may be sufficient, the carrier signal lose to modulated on a sub-interval of each time slot or a system time interval, as for example, the signal transmitter to sample the control signal only in certain time intervals, and in between, no information is detected by the signal transmitters. This time interval can be, for example, a system time interval or a time slot. Here, a particular time slot is a fixed time interval that is repeated within the Perio de system time.

The invention will be explained with reference to the enclosed ¬ accompanying figures with reference to embodiments again closer. Show it:

1 shows a conventional light signal system with a

Dimming ransformer,

2 shows a conventional traffic signal with two un ¬ terschiedlichen switchable voltage transformers,

3 shows a light signal system with a circuit arrangement according to an embodiment of OF INVENTION ¬ dung,

4 shows a circuit arrangement according to an embodiment of the invention for generating a frequency modulated signal,

5 shows a circuit arrangement according to an embodiment of the invention for generating a square-modulated signal,

6 shows a circuit arrangement according to an embodiment of the invention with a simple switch as a modulator, Figure 7 shows the circuit arrangement of Figure 6 with an additional bridging member for adjusting an amplitude swing of the modulated signal 8 shows a circuit arrangement according to an embodiment of the invention which with respect to power loss and noise emission is optimized,

9 shows the time course of a drive signal which has been generated by the circuit arrangement of Figure 8,

FIG 10 is a flow diagram illustrating a method for adjusting the brightness of a light system according to an embodiment of the invention.

FIG 1 shows a conventional dimmable light system 20 with a dimming transformer 6. The light system 20 to 'holds a voltage supply circuit 1, which serves to provide a supp for a given brightness of a Sig- nalgebers suitable supply voltage V. In addition, the light system 20 comprises a lamp switching device 2, which serves to switch between different signal generators to a signal generator unit. 3 For example, environmentally summarizes the switch unit 3 a signal transmitter 3a for red light, a transducer 3b for yellow light and a Sig ¬ nalgeber 3c for green light.

The power supply circuit 1 includes a voltage supply interface 15, which serves as a connection to a power supply line 4, for example with a supply voltage of 230V. In the voltage supply circuit 1 branches off from the voltage supply line ¬ 4 a conduit 5 to a transformer 6 from dimming. The dimming transformer 6 transforms applied to its input voltage V supp 6a, for example, 230V into a dim signal voltage V s i g. The present at the output 6b signal voltage V s i g is switched as needed from a first signal voltage changing switch 8 to a signal line 7 between the power supply circuit 1 and the lamp switching device. 2 That is, the first Signalspannungswech- operated switch 8 is switched to passage, when a signal of the encoder ¬ signal generator unit 3 is to illuminate with a reduced Hellig ¬ ness. In addition, between the supply line has Versor- is 4 and the signal line 7, a second signal voltage changing switch switched 9, which in the event that no dimming is desired, is switched to passage. The two signal voltage changing switch 8, 9 are switched alternately. For example, if the first signal voltage changing switch 8 turned on, the second signal voltage changing switch 9 is closed and vice versa. In this way, two different Sig ¬ nalspannungen V S i g and fro can be switched between.

The lamp switching device 2 has according to the number of the signal transmitters 3a, 3b, 3b of a signal generator unit 3, three Lam ¬ penschalter 10, 11, 12, with which a signal voltage V s i g on one of the signal transmitters 3a, 3b, 3b can be switched. It is also possible a switching of the signal voltage V s i g to multiple signal transmitter when multiple switches are to be lit simultaneously. This is, for example, in the preparation phase to a release of a passage through the traffic signal 20 of the case, that is, for example, at the transition from the red light phase to the green phase. As already he imagines ¬, the conventional dimmable light system 20 requires an additional dimming transformer 6, which has an increased footprint and brings relatively high costs. Furthermore, in Figure 1, a neutral conductor N between the signal generating unit 3 and the voltage supply interface 15 is shown.

In FIG 2, a conventional light system 30 is shown with an alternative power supply circuit. 1 The light system 30 shown in FIG 2 as well as the light system 20 shown in FIG 1 has a Lampenschalt- device 2 and a signal generator unit 3. The clamping ¬ voltage supply circuit 1 of the alternative light signal system 30 comprises, instead of the shown in Figure 1 dimming transformer's 6 two parallel-connected voltage transformers 13, 14, which may for example be formed as a so-called switching power supplies from ¬. A first voltage converter 13 converts a supply voltage V supp of 230 V into a DC voltage of 18 volts and to the first voltage converter 13 parallel-connected second voltage converter 14 converts the supply voltage V supp of 230 V into a DC voltage of 24 volts. Between the two voltage converters 13, 14 and the signal line 7 which connects the power supply circuit 1 having the lamp switching device 2, respectively a signal voltage changing switch 8 is switched 9, which in each case can switch one of the two DC voltages to the signal voltage line. 7 Is located on the signal transmitters 3a, 3b, 3c, the lower signal voltage V S i g of 18V, so the brightness of the respective signal transmitter 3a, 3b, 3c re- duced. Is located on the signal transmitters 3a, 3b, 3c, a signal voltage V ¬ S ig of 24V, so the respective ¬ be controlled signal generator is lit with full brightness. In addition, in Figure 2, a neutral conductor N between the signal generating unit 3 and the power supply interface 15 is shown.

In FIG 3, a light signal system 40 is shown with a circuit ¬ assembly 41 according to an embodiment of the invention. The light signal system 40 in FIG 3 comprises similarly to the light signal systems shown in Figures 2 and 3, 20, 30 a power supply circuit 41 which a Sig ¬ serves to provide for a specific brightness of a nalgebers suitable supply voltage or Signalspannnug V S ig. In addition, the light system 40 includes a LAM penschalteinrichtung 42, which serves to switch between different signal generators to a signal generator unit 43rd Furthermore, the light signal 40 has ¬ system shown in FIG 3 has a signal transmitter unit 43rd For example, in order ¬ 43 summarizes the switch unit a signal generator 43a for ro- tes light, a signal generator 43b for yellow light, and a signal generator 43c for green light. Shown in FIG 3 Lam ¬ penschalteinrichtung 42 has a similar structure as the corresponding units shown in Figures 1 and 2, and in particular includes the lamp switching device shown in FIG 3 42 three lamp switch 10, 11, 12, with which a signal MOD can be switched to one of the signal transmitters 3a, 3b, 3b. Externally, the signal transmitters shown in Figure 3 was prepared standardized 43 is also a in the Figures 1 and 2 gezeig ¬ th signal transmitter units of similar construction. However, it is in the processes shown in FIG 3 auto switches are so-called intelligent signal transmitter. These intelligent signal generators make it possible via modulation of the supply voltage or signal voltage digital telegrams or states from the controller, ie the inventive circuitry to send the signal transmitter. Depending on the information content of the digital telegram regulated intelligent control in the siren light output. Part of an Intel gent signal generator is also a demodulator (not ge ¬ shows), which analyzes the signal received from the power supply circuit modulated signal such that the ent ¬ retaining information, the brightness of the signal ge ¬ over can be detected by the signal transmitters and processed further on.

Furthermore, the structure of the gezeig ¬ th in FIG 3 Power supply circuit 41 according to an embodiment of the invention differs significantly from the conventional in Figures 1 and 2 shown power supply circuits. 1

The power supply circuit 41 shown in FIG 3 comprises a modulation signal generating unit 44, which is there to ¬ arranged to generate a modulation signal MD. The modulation signal MD includes control information, which is evaluated by the signal generator unit 43 and interpreted as a control command. The modulation signal generating unit 44 is connected elekt ¬ driven with a modulator unit 45th The modulator unit 45 is connected via a

Switch 8 connected to a voltage converting unit 14 that converts a supply voltage of 230V into a carrier signal voltage V i S g of 24 volts DC. If the modulator unit 45 and activated, the switch let transit to 8, is modulated onto the carrier signal V s i g a signal generated by the modulation signal generating unit 44 modulation ¬ signal MD. Be in modulating various ¬ dene method, such as frequency modulation or amplitude modulation or a rectangular modulation, can be used (as already written above, all waveforms are possible). 41 In addition, the circuit arrangement to a control data receiving unit 46 for receiving a Steuersig ¬ Nals. In this embodiment, the control data receiving unit 46 is part of the modulator unit 45. The control signal S comprising information relating to a discontinuing brightness of the illuminated signal unit 40, that is, the Mo ¬ dulationssignal MD is generated in response to a Steuersig ¬ nal S.

The modulated signal MOD is subsequently switch unit via the lamp 42 of the signal transmitter 43a, 43b to a, 43c forwarded to the signal generator unit 43rd Each of the signal generators 43a, 43b, 43c preferably includes a signal processor with egg nem demodulator (not shown) which the received signal MOD modu ¬ profiled divides again in the modulation signal MD with the control information and the carrier signal SIG. The signal processor of the respective signal transmitter 43a, 43b, 43c then sets on the basis of in the control signal S or modulation-onssignal MD contained control commands to a current through was ¬ ne light unit or to the light-emitting unit of the signal ge ¬ bers 43a, 43b, 43c voltage applied the commanding proper value. In this way, a multi-step or even con ¬ tinuous dimming the brightness of the signal generators 43a, 43b, 43c done. In addition, in Figure 3, a neutral conductor N between the signal generating unit 43 and the voltage supply interface 15 is shown.

In FIG 4 shows a circuit arrangement 41, according to an execution example of the invention, approximately with the main elements shown that the modulation signal generating unit 44, the Modula ¬ gate unit 45 and the switch 8 is increased. In the example shown in FIG 4 embodiment is used for modulation 1b

tion uses the principle of frequency modulation. The modulation signal generating unit 44 generates a sine ¬ signal depending on whether the switches are to light up (not ge ¬ shows) with full brightness or to glow with verrin- Gerter brightness, comprises a different Fre acid sequence. In the example shown in FIG 4 concrete example, the frequency of the modulation signal MD is set for normal Hel ¬ ligkeit to 1kHz and Festge for dimming to 2 kHz shall ¬. The ER- witnessed by the modulated signal generating unit 44 MD modulation signal is sent to the modulator unit 45 and there modulated onto a carrier signal SIG, so that a modulated signal MOD is generated.

The carrier signal SIG is shown in Figure 4 the top left in a diagram as a voltage signal to the DC voltage V s i g, which is constant over time t, is illustrated. The top right in Figure 4, the modulated signal MOD is also shown as a voltage signal in dependence on time. In a first time interval from t = 0, the frequency of the modulated signal MOD is 1 kHz. That is, it is submitted that the switches are to shine at full brightness NH a control command. At t = ti, the frequency of the modulated signal MOD is changed to 2 kHz. Now, a control command is transmitted, that the signal transmitters are light with reduced brightness Dim, therefore, are to be dimmed with the modulated signal MOD.

In Figure 5, a circuit arrangement 41 according to an alternative embodiment of the invention with the key elements, shown that a modulation signal generating unit 44, a modulator unit 45 increases and a switch. 8 In the example shown in FIG 5 embodiment, the principle of the square wave modulation is used for modulation. The modulation signal generating unit 44 generates a square wave signal having a fixed frequency and pulse ¬ wide. In the event that the switches are to shine at full brightness when ¬ ness is output from the modulation signal Erzeu ¬ supply unit 44 a signal. In the event that the signal transmitters are light with reduced brightness, is from the modulation signal generating unit 44, a

generated square-wave signal as a modulation signal MD. In the example shown in FIG 5 the specific example, the frequency of the rectangular modulation signal MD is placed firmly ¬ for dimming to 1 kHz. In the case of reduced brightness the rectangular modulation signal generated by the modulation signal generating unit 44 MD is sent to the modulator unit 45 and modulated onto a carrier signal SIG there, so that a modulated modulated signal MOD is generated. The carrier signal SIG is in the Figure 5 top left in a diagram as a voltage signal to the voltage V S G i as a function of time t ¬ veran illustrated. It is formed as a constant DC voltage signal from ¬.

The top right in FIG 5, the modulated signal MOD is flat ¬ case shows, as a voltage signal in dependence on time ge ¬. In a first time interval from t = 0, the Fre acid sequence of the modulated signal MOD is 1 kHz, and the signal has a rectangular modulation of the amplitude. That is, it is submitted that the switches are to light with reduced brightness Dim a control command. At t = ti, the modulated signal MOD is changed so that now only the constant carrier signal SIG is transmitted. Now, a control command is received that the switches are to shine at full brightness NH with the modulated signal MOD. The square wave modulation by the modulator 45 in the embodiment in FIG 5 corresponds to an addition of the modulation signal MD to the carrier signal SIG. That is, it is added to a constant a carrier signal SIG between a positive and a negative value alternating rectangular signal MD.

In FIG 6 is a circuit 41b according to a weite- ren alternative embodiment of the invention with the key elements, shown that a modulation signal generating unit 44 and a switch 8 is increased. In the example shown in FIG 6 embodiment, the principle of the square wave modulation, same as in the example shown in FIG 5 embodiment for modu lation ¬ used. The arrangement in FIG 6, however, is simplified in that the modulator unit 5 shown in FIG 45 is omitted and is instead adapted only one switch. 8 The switch 8 provides a switchable electrical connection between the voltage converter unit 14 (see FIG 3) and the line 7 to the lamp switch unit 42. The control of the switch 8 takes place in the example shown in FIG 6 embodiment by the modulation signal generating unit 44. The modulation ¬ signal in turn generating unit 44 generates a NAL Rechtecksig ¬ with a fixed frequency and pulse width. In the event that the switches are to shine at full brightness, no Sig- from the modulation signal generating unit 44 is output nal. Thus, the switch remains to 8 ge passage ¬ switches and as a control signal MOD the constant carrier ¬ signal SIG is output. are for the case that the signal transmitter referred having a reduced brightness, as a dimming or dimming state, light is output from the modulation signal generating unit 44 is a square wave signal. The switch 8 is now driven with the square-wave signal, which causes the switch between the on state and the open state changes. If the switch 8 on passage, the modulated signal MOD to an amplitude corresponding to the amplitude of the carrier signal SIG. If the switch is, however, 8 is opened, there is no signal on the line to the voltage converter unit 14 and the amplitude of the modu ¬ profiled signal MOD is 0. In the example shown in FIG 6 concrete example, the frequency of the rectangular modulation is tion signal MD for dimming to 1 kHz fixed. The carrier ¬ signal SIG is illustrated in FIG 6 in the top left in a diagram as a voltage signal to the voltage V as a function of time t. It is designed as a constant DC clamping ¬ voltage signal. Top right of the FIG 6, to modulated signal MOD is also shown as a voltage signal in depen ¬ dependence on the time. In a first time interval from t = 0, the frequency of the modulated signal MOD is 1 kHz, and the signal has a rectangular shape. That is, it is submitted that the switches are to light with reduced brightness Dim a control command. At t = ti, the modulated signal MOD is changed so that now only the constant carrier signal SIG is transmitted, ie, the switch 8 is now permanently turned on. In this state to a ¬ Steuerungsbe ¬ failed is transmitted, that the switches are to shine at full brightness NH with the modulated signal MOD. In FIG 7 is a circuit 41c according to another alternative embodiment of the invention with the key elements, shown that a modulation signal generating unit 44, a switch 8 and a Amplitudenhub- setting unit 47 increases. In the example shown in FIG 7 embodiment, the principle of the square wave modulation, same as in the example shown in FIG 6 embodiment for modulation. The arrangement in FIG 7 is the same as the arrangement shown in FIG 6 to the effect ¬ be considered that the modulation of the carrier signal SIG is realized by turning control of the switch. 8 The switch 8 provides a switchable electrical connection between the voltage converter unit 14 (see FIG 3) and the line 7 to the lamp switch unit 42. The control of the scarf ¬ ters 8 is performed by a supply unit of the modulation signal Erzeu- 44 generated modulation signal MD. Ent extent ¬ speaking, the construction of the circuit arrangement shown in Figure 7 the structure 41c in FIG 6. In addition, the circuit arrangement, however, still 41c an amplitude swing setting unit 47. The amplitude swing setting unit may for example route a diode comprise or be formed as a series regulator. It bridges the switch 8 and is turned on to this parallel ge ¬. The amplitude swing setting unit 47 works in that a corresponding voltage drops AU depending on the set resistance of the Ampli ¬ tudenhub setting unit 47 on the plane formed by the amplitude swing setting unit 47 Brü ¬ blocks via the switch. 8 If the switch 8

switched passage, so there is no voltage drop across the switch 8, because the switch 8 has a minimum resistance in transmitted on state. If the switch is, however, opened 8 that is GE blocks ¬, the carrier signal SIG is not completely ¬ broken, but may on the formed by the amplitude swing setting unit 47 bridge to the voltage dropped across the bridge or the amplitude swing setting unit 47 voltage AU reduced still be present at the output of the circuit arrangement 41c.

As with the embodiment in FIG 6, the modulation generated tion signal generating unit 44 in turn a square wave with a fixed frequency and pulse width. In the event that the switches are to shine at full brightness is output from the modulation signal generating unit 44 a signal. Thus, the switch remains switched through 8 on passage and as the control signal MOD the constant carrier ¬ signal SIG is output. Are for the case that the signal transmitter referred having a reduced brightness, as a dimming or dimming state, light is outputted from the modulation ¬ signal generating unit 44 is a square wave signal. The switch 8 is now driven with the square-wave signal, which causes the switch stand 8 between Durchlasszu ¬ and switches the open state. If the switch 8 on passage, the modulated signal MOD to an amplitude corresponding to the amplitude of the carrier signal SIG. When the switch 8 is opened, however, reduced by the voltage AU signal on line 7 is located on the lamp switch unit 42 and the amplitude of the modulated signal MOD is V S i g -AU. In the example shown in FIG 7 concrete example, the frequency of the square-wave modulation signal MD is set for dimming to 1 kHz. The carrier signal SIG is illustrated in FIG 7 in the top left in a diagram as a voltage signal to the voltage V as a function of time t. It is designed as a constant DC voltage signal. Top right of Figure 7, the modulated signal MOD is also shown as a voltage signal in dependence on time. In a first time interval from t = 0, the frequency of the modulated signal MOD is 1 kHz and the modulated signal MOD has a rectangular shape, the minimum amp litude the electric voltage of the modulated signal MOD V S ig -AU by weight and the maximum amplitude V s i g. That is, it is transmitted to a control command that will light up signal ge ¬ over with reduced brightness Dim. At t = ti, the modulated signal MOD is changed so that now only the constant carrier signal SIG is transmitted, ie, the switch 8 is now permanently turned on. Now, a control command transmitted with the modulated signal MOD and the carrier signal SIG that the switches are to shine at full brightness NH. With the setting of the modulation amplitude of the noise immunity and the efficiency of the circuit arrangement can be influenced. If a large amplitude swing AU is selected, the immunity is increased or there is enough ER- an improved signal / noise ratio. However, the efficiency of the circuit drops in connection with this measure. However, one chooses a lower amplitude swing AU, the efficiency is improving ¬ sert is for a lower immunity is accepted in this case.

In FIG 8 a circuit 41d according to another alternative embodiment of the invention with the key elements, that is, a modulation signal generating unit 44, a clock control unit 48, a micro shaving unit 49, a switch 8 and a Amplitudenhub- setting unit 47, is shown enlarged. In the example shown in FIG 8 embodiment, the principle of the square wave modulation, same as in the example shown in FIG 7 embodiment for modulation. The arrangement in FIG 8 is the same as the arrangement shown in FIG 7 to the effect ¬ be considered that the modulation of the carrier signal SIG by turning control of the switch is implemented. 8 The switch 8 provides a switchable electrical connection between the voltage converter unit 14 (see FIG 3) and the line 7 to the lamp switch unit 42 (see FIG 3). Furthermore, environmentally summarizes the circuit arrangement shown in FIG 8 41d as well as in FIG circuitry shown 7 41c an amplitude swing adjustment unit 47. The amplitude swing setting unit 47 may be formed for example as a diode path or as longitudinal ¬ regulator. It bridges the switch 8 and is connected in parallel to this. The function of the Amplitu ¬ denhub setting unit 47 is already explained in the description of FIG 7, so that reference is made at this point. The actuation of the switch 8 is carried out, as in the embodiment of FIG 7 with the aid of a Modulati ¬ onssignals MD. Is in contrast to that shown in Figure 7 arrangement 41c in the embodiment shown in FIG 8 circuitry, however, the modulation signal MD 41d by mixing, such as Mul ¬ tiplizieren, the signal generated by the modulation signal generating unit 44 signal MD to a clock control signal TKT pro- duces which is generated from the timing control unit 48th The two signals MD, TKT be ge ¬ mixed in a mixer unit 49 that is for example multiplied, to give a mixed modulation signal MMD results, with which the switch is controlled. 8

The clock control unit 48 outputs the duty ratio between the system time t sys and a modulation time t i moc before for the case of a reduction of the brightness of the signal transmitter. The corresponding duty ratio of the clock signal CLK is shown in a graph in FIG 8 lower left. The clock signal CLK is referred to as square-wave signal with the modulation time t i moc in time intervals t ¬ Sy s generated. As with the embodiment in FIG 7, the modulation signal generating unit 44 generates a square wave signal in turn te MD at a fixed frequency and pulse-width. This signal is shown above the porthole ¬ image for the clock signal to the left in FIG. 8 In the event that the Sig ¬ nalgeber are lit with full brightness, no signal from the modulation signal generating unit 44 is ausgege ¬ ben. Thus, the switch 8 is switched to passage, and as a control signal MOD the constant carrier signal SIG is given from ¬. are for the case that the signal transmitters indicated by reduced brightness, as a dimming or dimming state, light is output from the modulation signal generation unit 44, a square-wave signal MD. The Rechtecksig ¬ nal MD is mixed in the mixing unit 49 with the timing control signal CLK from the clock control unit 48, wherein a mixture ¬ tes MMD modulation signal is generated. The switch 8 is now driven with the mixed modulation signal MMD, which causes the switch 8 only during the Modula ¬ tion time Trao d between the on state and switches to open ¬ stand. If the switch 8 on passage, the modulated signal MOD to an amplitude corresponding to the amplitude of the carrier signal SIG. If the switch 8 opens, however ge ¬, reduced by the voltage AU signal is applied to the line to the air switch unit 42 (see FIG 3) and the amplitude of the modulated signal MOD is V s i g -AU. In the example shown in FIG 8 concrete example, the frequency of the square-wave modulation signal MD is set for dimming to 1 kHz. The carrier signal SIG is illustrated in FIG 8 in the top left in a diagram as a voltage signal to the voltage V as a function of time t. It is designed as a con- stantes DC signal. The top right in FIG 8, the modulated signal MOD is also shown as a voltage signal in ¬ a function of time. In a first time interval from t = 0 to t = t m0d the frequency of the mo ¬ dulierten signal MOD is 1 kHz and the modulated signal MOD has a rectangular shape, wherein the minimum amplitude of the modulated signal MOD V s i g -AU is the maximum amplitude V s i g. That is, it is submitted that the switches are to light with reduced brightness Dim a control command. At t = t i moc is the modulated signal MOD now amended due to the established by the clock control unit modulation time t moc i that now only the constant carrier signal SIG is transmitted, ie, the switch 8 is now permanently turned on. Due to the festgeleg ¬ th system time t sys, which is greater than the modulation time t m0d, however, from the driven to the signal transmitter

Moc time t i made no change in brightness, because the processor of the signal generator with the system time t sys is getak ¬ tet and therefore until the time t svs a new command from the lamp switch unit 41d expected. From the time t = t S ys is with the modulated signal MOD that corresponds to this time, the constant carrier signal SIG, a control command transmitted, that the switches are to shine at full brightness NH. Detects the signal transmitter at the beginning of t sys due to modulation a dimming command, the switch will be activated by the end of t sys dimmed. In the next time slot, the analysis repeated. The advantage of the clocked modulation consists DA rin, that the power dissipation is limited and thus the efficiency of the circuit arrangement can be influenced 41d low.

The power loss P v of the circuit arrangement 41d results to be

Figure imgf000026_0001
where I S is the strength of the unmodulated carrier signal SIG corresponding de amperage, AU is the amplitude swing, t sys of the system clock is received, the signal transmitter signals with the, and t i moc the aforementioned modulation time.

The efficiency of n results to be

U p -AU-t sys -t mod

η = τ -, (2) where Uo = V S G i, ie the voltage of the carrier signal SIG. In FIG 9 is a diagram for illustrating the relationship between the modulated control signal MOD, which is located in function of time in the graph in the upper region, and the current flowing through the lighting units of the signal generator current I v is shown. As voltage supply circuit thereby a circuit arrangement to the embodiment shown in FIG 8 is used according to 41d. The time t (on the abscissa) is in time slots TS = 1 to TS = 8 divided. The length of time slots ent ¬ speaks in this case, the system time t sys. In TS = 1, the system is switched on and telt übermit- using a modulated control signal MOD to a signal transmitter, a dimming command. The signal transmitter regulates the current I v by the lighting unit, such as an LED down so that energy can be saved and a dazzling effect of Ver ¬ Kehr is avoided. In the time slots TS = TS = 2 and 3, before a renewed dimming command from the signal transmitter is received at the beginning of the time slot and the dimming of the illumination means with reduced brightness continued. In TS = 4 absolutely no control signal is supplied to the signal generator further ¬ so that the signal transmitters are off. (This ge ¬ schieht in the lamp switch by the switches 10, 11 and 12. In the time slot TS = 6 again carried out a switching on the supply voltage, however, the carrier signal SIG is not modulated in this case, which of the signal transmitter as Be ¬ fail to illuminate is interpreted at full brightness, so that the current I is maximal v by the lighting units.

In FIG 10, a method 100 for adjusting the brightness of a light signal system 40 is illustrated in a flow chart according to an embodiment of the invention. At step 10, a control signal I S is received, which includes In respect ¬ formations of an adjusted brightness of the light signal system 40th The control signal S can, for example from an external device, such as a traffic control center, come. Continuously over time, a carrier signal SIG by converting ei ¬ ner to the power supply interface applied electrical supply voltage V supp is in an electrical carrier signal voltage V s i g generated according to step 11.10. The carrier signal SIG is used to transport the control information to a signal encoder 43 of the light signal system 40. In the step 10, a modulation signal III MD function of the genes are received, ¬ control signal S is generated. At step 10, the carrier signal SIG IV is modulated to the signal generator 43 with the modulation signal MD ¬ to a modulated control signal MOD.

It is finally pointed out once again that this han ¬ punched in the above-described devices and methods only to preferred embodiments of the invention and that the invention can be varied by the skilled person without departing from the scope of the invention in so far as determined by the claims is. Thus, the method and the circuit arrangement primarily been with reference to a

Traffic lights explained. However, the invention is not limited to use in a light signal system nor to an application in the transport sector, but the invention can also in principle be applied to other signals, such as acoustic systems and for other purposes, such as warning systems or the like. It is also pointed completeness ¬ reported executed that the use of the indefinite article does not exclude "a" or "an" means that the features in question can also be present more than once. Likewise, the term "unit" does not exclude that it consists of several Components ¬ th, which may also be spatially distributed if necessary.

Claims

claims
1. Light signaling system (40) comprising:
- a circuit arrangement (41, 41a, 41b, 41c, 41d) for switching make the brightness of signal transmitters (43) of a light signal system (40) comprising:
- a power supply interface (15) for receiving an electrical supply voltage (V supp)
- a voltage conversion unit (14) for generating a carrier signal (SIG) by converting the electrical supply voltage (V supp) into a carrier signal voltage
(V sig),
- a control data receiving unit (46) for receiving a control signal (S), wherein the control signal (S) with respect to a informa- tion to be adjusted brightness of the light signal system (40),
- a modulation signal generating unit (44) for Erzeu ¬ gene of a modulation signal (MD) in response to the received control signal (S),
- a modulator unit (45, 8) for modulating the carrier ¬ signal (SIG) with the modulation signal (MD) to a mo ¬ dulierten control signal (MOD) for controlling the brightness of the signal transmitter (43),
- a signal transmitter device (43) comprising:
- a plurality of signal generators (43a, 43b, 43c), wherein each of the signal transmitters ¬ (43a, 43b, 43c) comprises:
- to receive a demodulation unit, which is adapted to a modulated signal (MOD) of the circuit arrangement (41) and a modulation signal (MD) and a carrier signal (SIG) to demodulate, and
- a signal processor which is adapted to using the information contained in the modulation signal control instructions to adjust a current flowing through the signal transmitter current or a voltage applied to the signal transmitter electrical voltage to a proper command value,
- a signal transmitter switching unit (42) disposed between the
Circuitry (41, 41a, 41b, 41c, 41d) and the Sig ¬ nalgebereinrichtung (43) and is connected to eingerich- tet is, between different signal transmitters (43a, 43b, 43c) switch.
2. The light signal system (40) according to claim 1, further comprising an additional switch (8) between the voltage transformers averaging unit and the modulator unit (45).
3. Light signaling system (40) according to claim 1 or 2, wherein the modulation signal generating unit (44) is adapted to generate a modulation signal (MD), a sinusoidal signal.
4. The light signal system (40) according to claim 3, wherein the sinusoidal signal comprises ¬ for setting a normal brightness of a Fre acid sequence of 1 kHz and a weaker brightness has a frequency of 2 kHz.
5. Light signaling system (40) according to any one of claims 1 or 2, wherein the modulation signal generating unit (44) to a ¬ is directed, as a modulation signal (MD) to produce a square wave signal.
6. light signal system (40) according to claim 5, wherein the Modula ¬ gate unit (45) is controlled such that the A ¬ a normal brightness modulated no rectangle signal lines and a weaker brightness modulation of the carrier signal (SIG) with a square wave with a frequency of 1 kHz is performed.
7. Light signaling system (40) according to any one of claims 1 to 6, wherein the modulator unit (45) as a simple switch (8) is performed.
8. light signal system (40) according to any one of claims 1 to 7, wherein the voltage conversion unit (14) is adapted to the supply voltage (V supp) in an electric
DC voltage (V s i g) of a carrier signal (SIG) to convert.
9. light signal system (40) according to any one of claims 1 to 8, comprising an amplitude swing setting unit (47) which is adapted to an amplitude of the modulated control ¬ signal (MOD) to adjust.
10. light signal system (40) according to claim 9, wherein the amplification ¬ tudenhub setting unit (47) has a diode path or a series regulator, wherein the modulator unit (45) ¬ bridged.
11 light signal system (40) according to one of claims 1 to 10, comprising a timing control unit (48) to a ¬ is directed to establish a duty cycle with which the carrier signal (SIG) with the modulation signal (MD) is modulated.
12, light signal system (40) according to one of claims 1 to 11, comprising a signal multiplication unit (49) which is as ¬ to set, generated a from the timing control unit (48) clock signal to multiply (TKT) with the modulation signal (MD).
13. The method (100) for adjusting the brightness of a
Light signal system (40) comprising the steps of:
comprises receiving a control signal (S), wherein the control signal (S) information regarding an adjusted brightness of the light signal system (40), -
- generating a carrier signal (SIG) by converting a supply voltage (V supp) into a carrier signal voltage (V sig),
- generating a modulation signal (MD) in response to the received control signal (S),
- modulating the carrier signal (SIG) to the Modulationssig ¬ nal (MD) to a modulated control signal (MOD) to tax the brightness of the light signal system s (40)
- switching to a selected signaling devices (43a, 43b, 43c), - receiving the modulated control signal (MOD) of the
Circuitry (41),
- demodulating the control signal (MOD) in a Modulationssig ¬ nal (MD) and a carrier signal (SIG),
- determining a control signal based on the Modulationssig ¬ Nals (MD),
- setting a by the selected signal generator (43a, 43b, 43c) flowing current or to the selected signaling devices (43a, 43b, 43c) pending control commands contained electrical voltage to a command proper value based on the in the modulation signal (MD).
14. A computer program product which is directly into a memory of a traffic signal (40) can be loaded, cut with Programmcodeab ¬ to perform all steps of a method according to claim 13 when the program is run in the light signal system (40).
PCT/EP2016/051291 2015-02-20 2016-01-22 Brightness control for a light signal system WO2016131605A1 (en)

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Citations (7)

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EP1323976A2 (en) * 2001-12-23 2003-07-02 Der Kluth: Decke und Licht GmbH Lighting apparatus
WO2011056242A1 (en) * 2009-11-06 2011-05-12 Neofocal Systems, Inc. System and method for lighting power and control system
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CN103533717A (en) * 2013-10-25 2014-01-22 深圳市镭润科技有限公司 Electronic equipment based on direct current supply communication and control method thereof

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Publication number Priority date Publication date Assignee Title
EP1323976A2 (en) * 2001-12-23 2003-07-02 Der Kluth: Decke und Licht GmbH Lighting apparatus
WO2011056242A1 (en) * 2009-11-06 2011-05-12 Neofocal Systems, Inc. System and method for lighting power and control system
US20120280638A1 (en) * 2009-12-08 2012-11-08 Tridonic Ag Controllable Retrofit LED Lamps and Lighting System Having an LED Lamp
EP2466996A2 (en) * 2010-12-16 2012-06-20 CP electronics GmbH Illumination system
US20130270998A1 (en) * 2012-04-17 2013-10-17 Axlen, Inc. Solid-state lighting systems having intelligent controls
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