EP2911477A1 - Dispositif et son utilisation destiné à surveiller des éclairages à DEL - Google Patents

Dispositif et son utilisation destiné à surveiller des éclairages à DEL Download PDF

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Publication number
EP2911477A1
EP2911477A1 EP15153512.7A EP15153512A EP2911477A1 EP 2911477 A1 EP2911477 A1 EP 2911477A1 EP 15153512 A EP15153512 A EP 15153512A EP 2911477 A1 EP2911477 A1 EP 2911477A1
Authority
EP
European Patent Office
Prior art keywords
voltage
signals
monitoring
signal
comparator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15153512.7A
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German (de)
English (en)
Inventor
Dr. Martin Gollbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaltbau Refurbishment GmbH
Original Assignee
Pintsch Bamag AG
Pintsch Bamag Antriebs und Verkehrstechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Pintsch Bamag AG, Pintsch Bamag Antriebs und Verkehrstechnik GmbH filed Critical Pintsch Bamag AG
Publication of EP2911477A1 publication Critical patent/EP2911477A1/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]

Definitions

  • the invention relates to the technical field of monitoring LED lights by means of voltage monitoring.
  • the invention relates to a device for monitoring a voltage, a combination of the device with a circuit for normalizing a voltage and the use of the combination for monitoring LED lights.
  • the strands are two filaments, which are used in a so-called.
  • Two-filament incandescent lamps and are usually referred to as the main and secondary thread (also called replacement thread).
  • the secondary thread is used to ensure functioning of the light bulb in case of failure of the main thread and thus virtually to form an internal "replacement lamp”.
  • the switching is detected as a fault at the same time, so that the required lamp replacement can be displayed to the maintenance personnel.
  • LED luminaires replace traditional light sources in innumerable, in part also safety-relevant areas. With the increasing use of LED luminaires, safety-relevant applications also occur where the failure of one or more LEDs requires a quick diagnosis message. This concerns in particular LED lights for signaling devices or for vehicles, in particular rail vehicles.
  • a LED array for light-emitting devices with a set of LED strings wherein for each LED string of the set of LED strings there is provided a current-source ballast unit having a voltage input for a voltage and a power output for outputting a power a current and the voltage to the respective LED string comprises.
  • a warning signal device generates a warning signal when a current or voltage is outside certain desired ranges, wherein the voltage applied to each strand and the current flowing through the respective strand current are detected at certain measuring points.
  • analog quantities such as the LED current and / or the LED voltage may be monitored.
  • a known device for monitoring such analog variables shows Fig. 1 with A / D converter 10, which can receive a quantity to be monitored, such as current or voltage, and convert it into a digital quantity and forwards this digital quantity to a microcontroller 12 for evaluation by means of software.
  • the microcontroller 12 can then output as a result of the evaluation, a signal that is used for diagnostic message.
  • the software that can be used requires a considerable amount of extra work during development, especially for safety-relevant systems.
  • Comparator 14 thus serves to output a first signal at a voltage difference between the first and the second voltage input in a first region and a second signal at a voltage difference between the first and second voltage input in a second region, which is delimited and adjacent to the first region ,
  • a first signal at a voltage difference between the first and the second voltage input in a first region
  • a second signal at a voltage difference between the first and second voltage input in a second region, which is delimited and adjacent to the first region
  • the CN 10 347 8815 A shows a signal generator based on a so-called.
  • FPGA field programmable gate array
  • the DE 10 2008 064 766 B3 and the DE 35 41 343 A1 each show a device according to the preamble of claim 1.
  • the US 2013/0 082 615 A1 shows an integrated LED driver circuit with pulse width modulation.
  • the invention has for its object to provide a monitoring of analog sizes, in particular analog sizes of LEDs or LED strands of an LED light, cost-effective with high reliability.
  • the invention is further based on the object of being able to realize a device for monitoring such analog variables, which can be checked and / or adapted with little effort.
  • the device should be cost-effectively combined with diagnostic and / or control functions for power consumers, in particular for LEDs or LED strands of an LED lamp whose analog sizes are monitored.
  • the invention relates to an apparatus for monitoring at least one voltage comprising at least one comparator, at least one comparator in each of the comparators, a voltage output unit, and one connection between the voltage output unit and each of the second voltage inputs, the comparator having first and second voltage inputs and for outputting a first signal at a voltage difference between the first and the second voltage input in a first region and a second signal at a voltage difference between the first and second voltage input in a second region, which is delimited and adjacent to the first region wherein each of the first voltage inputs is connected to a monitor voltage input of the comparator.
  • the device has a signal generator in the voltage output unit and for generating a pulse-width modulated signal for each of the compounds and for setting a pulse-pause ratio for each of the pulse width modulated signals, wherein on each of the compounds, a first filter, in particular a low-pass filter for the pulse width modulated signal is provided.
  • voltages applied to the monitoring voltage inputs of the comparison device and / or variables represented by these voltages, in particular current values, can be provided, which are supplied by suitable converters.
  • reference voltages can be set with the voltage output unit in a simple and reliable manner.
  • the voltage output unit is an FPGA.
  • FPGAs are well-known, freely programmable, cost-effective, fast and reliable logic hardware devices.
  • the setting of the pulse-pause ratios will be done simply by configuring and interconnecting the logic blocks of the FPGA. This sets the pulse-pause ratio for each of the pulse-width-modulated signals, and thus for each of the comparators, a threshold at which the comparator switches and thus signals that it falls below or exceeds the limit value.
  • monitoring by a digital circuit namely a cost-effective customizable FPGA, is possible without requiring execution of software during runtime, which in particular brings advantages in the assessment of security-relevant systems.
  • a monitoring by a digital circuit in particular a low-cost customizable FPGA is possible without requiring execution of software during runtime, which in particular brings advantages in the assessment of security-related systems.
  • At least one of the comparison means comprises a set of two of the comparators with a parallel connection of the first voltage inputs of the two of the comparators to the comparator
  • Monitoring voltage input of this comparator comprises, wherein the voltage applied to the second voltage inputs of the two of the comparators pulse width modulated signals for establishing an upper and a lower limit for a voltage applied to the monitoring voltage input of the comparator voltage are set.
  • the device according to the invention comprises an evaluation unit, which is connected to each of the evaluation units for receiving the first and / or second signals and has a function for outputting diagnostic messages as a function of the first and / or second signals, in particular the evaluation unit having a first area of the freely programmable logic module is formed.
  • Such device variants further advantageously comprise a control unit, preferably designed as a second region of the freely programmable logic module, which has a function for receiving setting signals and a function for outputting desired value signals for current sources on the basis of the setting signals, wherein the evaluation unit also has a function for receiving the Setting signals comprises and the function for outputting diagnostic messages is a function for outputting diagnostic messages in response to the first and / or second signals and the setting signals.
  • the control unit may have pulse width modulation units for generating the setpoint values and thus allow the use of a common clock generator for the control unit, the evaluation unit and / or the signal generator.
  • a second filter in particular a low-pass filter, can be used at its monitoring voltage input for smoothing a voltage to be monitored in order to eliminate superimposed interference and thus a smoothed voltage to the first input of the comparator / comparators to give the comparator.
  • the device according to the invention can be combined with a circuit comprising at least one of the monitoring voltage inputs of the device a normalizing converter by converting a current or voltage in the circuit into a voltage to be monitored, to current and / or voltage values of LEDs or to monitor the LED strings of an LED luminaire and, if necessary, also control it.
  • the current values are in particular current values of the current sources of the LEDs or the LED strings.
  • FIG. 3 A device for monitoring a voltage shown a comparator 20 with comparator 14.
  • the comparator 14 is as in the Fig. 2 apparatus shown a comparator, which switches depending on a voltage difference between its first and second voltage input, thereby signaling an exceeding of the limit value with an output voltage.
  • This is generally a comparator 14 having first and second voltage inputs and for outputting a first signal at a voltage difference between the first and second voltage inputs in a first range and a second signal at a voltage difference between the first and second voltage inputs in a second Area delimited and adjacent to the first area.
  • the first voltage input of the comparator 14 is the first voltage input of the comparator 20 and the second voltage input of the comparator 3 is a monitoring voltage input of the comparator 20, which is connected via a connection with a voltage output unit 22.
  • the first and second signal is thus at the output of the comparator 14 as a diagnostic signal when monitoring the first voltage input available.
  • the device shown has the in Fig. 3
  • the device shown has a voltage output unit 22 with a signal generator 24 for generating a respective pulse-width-modulated signal 26 and setting its pulse-pause ratio.
  • a first low-pass filter 28 for the pulse width modulated signal 26.
  • the comparator 14 forms a comparison device 20 with a second low-pass filter 30 connected to its first voltage input for smoothing a voltage to be monitored. The first or second signal is thus available at the output of the comparator 14 as a diagnostic signal when monitoring a filtered voltage which has been freed from interference available.
  • the invention provides, as in Fig. 3 . 5 and 6 an apparatus for monitoring at least one voltage, comprising at least one comparator 20, at least one comparator 14, 34, 36 in each of the comparators 20, a voltage output unit 22, one connection between the voltage output unit 22 and each of the second voltage inputs, a signal generator 24 in the voltage output unit 22 for generating one pulse width modulated signal 26 for each of the connections and setting a pulse-pause ratio for each of the pulse width modulated signals 26 and on each of the connections a first filter 28 for the pulse width modulated signal 26, the comparator 14, 34, 36 has a first and a second voltage input and for outputting a first signal at a voltage difference between the first and the second voltage input in a first region and a second signal at a voltage difference between the first and secondactsse is formed in a second region, which is delimited and adjacent to the first region, wherein each of the first voltage inputs is connected to a monitoring voltage input of the comparison device 20.
  • the apparatus of the invention may advantageously comprise a plurality of comparators 14, 34, 36, each receiving a filtered pulse width modulated signal at its second voltage input, and in particular, as in FIG Fig. 6 shown, a plurality of comparison means 20 with such comparators 14, 34, 36.
  • One to suitable signal generator based on an FPGA for a set of pulse width modulated signals 26 shows CN 10 347 8815 A , to which reference is made here for revelation.
  • a corresponding signal generator is in Fig. 4 shown.
  • the in Fig. 4 The signal generator shown in FIG. 1 is implemented as area 38 of an FPGA and has a bit counter 40 which receives a clock signal and, in response, outputs a bit value between 0 and N to each of eight equalizers 42, of which only a few have been referenced for clarity ,
  • a respective constant value transmitter 44 which supplies a constant value by memory input with a converter table of the FPGA, is connected to one of the matching devices 42.
  • the matching devices 42 may be designed as comparators and have a function for detecting whether the bit value corresponds to the supplied constant value.
  • the signal generator further comprises seven RS flip-flop circuits 46, of which only a few have been provided with reference numerals for reasons of clarity. Each of these RS flip-flop circuits 46 is supplied at its respective R input with the output signal, and thus the result of the detection performed by one of the first through seventh of the eight equalizers 42, for resetting the respective RS flip-flop circuit 46.
  • An eighth of the eight equalizers 42 receives 0 as a constant value and outputs its output signal, and thus the result of the detection performed by it, to the S inputs for setting the seven RS flip-flop circuits.
  • Each of the RS flip-flop circuits 46 outputs a pulse-width modulated signal 26 based on the clock signal and whose duty cycle is set by the constant value supplied to the matching means 42 connected to its S input.
  • a pulse width modulation unit or a signal generator is obtained in an FPGA, which can generate multiple channels with different pulse-pause ratios, with only a single bit counter 40 is applied.
  • Fig. 5 shows one of the comparison means 20 of in Fig. 6 shown device.
  • the comparator has a set of two comparators 34, 36 with a parallel connection of the first voltage inputs of the two of the comparators 34, 36
  • the second voltage input of the comparators 34, 36 each receive a pulse width modulated signal 26 and is connected to a parallel to the input of this pulse width modulated signal 26 connected capacitor 48 for smoothing this signal.
  • a maximum value comparator 34 detects the exceeding of an upper limit of an allowable value band set by the signal applied at its second voltage input.
  • a minimum value comparator 36 detects the exceeding of an upper limit of an allowable value band set by the signal applied at its second voltage input. Alternatively, underruns of limits set by the signal applied to its second voltage input can also be evaluated.
  • An evaluation unit 50 connected to the outputs of the two comparators 34, 36 can thus make a diagnosis as to whether a variable to be monitored is within a permissible value band.
  • comparators 20 can be monitored with two units consisting of comparator, low-pass and PWM generator, whether a signal leaves an acceptable value band.
  • the device shown forms a multi-channel monitoring circuit 52, in the example shown a five-channel monitoring circuit with five of the in Fig. 5 shown comparison means 20, wherein each of the comparison means 20 is connected upstream of its monitoring voltage input, a second low-pass filter 30 for smoothing a voltage to be monitored.
  • Each of the comparators 20 is connected to the second voltage inputs of its set of comparators 34, 36 via a respective first low-pass filter 28 to a voltage output unit 22, from which each first low-pass filter 28 receives a pulse width modulated signal 26.
  • the voltage output unit 22 receives, for each of the five monitored channels, a setting signal for establishing a pair of constant values.
  • the voltage output unit 22 receives a clock signal modified by a prescaler 54, and has a signal generator corresponding to the one shown in FIG Fig. 4 shown signal generator based on the clock signal and the constant values to the low-pass filters 28 guided pulse width modulated signals generated.
  • the inserted FPGA has an area in which the voltage output unit 22 is set up, and an area where an evaluation unit 50 is set up and an area where the prescaler 54 is arranged.
  • Each of the comparison devices 20 is connected to the evaluation unit for outputting the first and / or second signals.
  • the evaluation unit 50 receives the setting signals and has a function and an output for outputting diagnostic messages as a function of the first and / or second signals.
  • the adjustment signals are in Fig. 6 represented by arrows on the voltage output unit 22 and the evaluation unit 50.
  • multi-channel monitoring circuit 52 is used to monitor four currents of four LED strings and one of the four LED strings supplied voltage.
  • converters output voltages to the second low-pass filters 30, which represent the currents.
  • Fig. 7 shows a control and monitoring device 56 with a corresponding to in Fig. 6
  • the multi-channel monitoring circuit 52 is shown here, wherein the multi-channel monitoring circuit 52 is embodied here as a four-channel monitoring circuit.
  • the multi-channel monitor 52 is used to monitor three streams of three LED strings and a voltage applied to the three LED strings.
  • a configured voltage output unit of the multi-channel monitoring circuit 52 has a stored pair of constant values, on the basis of which, based on a clock signal modified by a prescaler 54 on one of the channels, the voltage supplied to the three LED strings is monitored.
  • the clock signal modified by the prescaler 54 is supplied to both the voltage output unit and a control unit 58.
  • the voltage output unit and one corresponding to Fig. 6 described evaluation unit of the multi-channel monitoring circuit 52 and the control unit 58 a set of three adjustment signals is supplied.
  • the three Adjustment signals are used to monitor and control three currents of the three LED strings.
  • the control unit 58 has for this purpose a function for outputting desired value signals for current sources of the LED strings on the basis of the adjustment signals.
  • a corresponding to Fig. 6 designed evaluation unit 50 of the multi-channel monitoring circuit 52 has a function for receiving the setting signals on a function for outputting diagnostic messages.
  • the inserted FPGA has an area in which the voltage output unit 22 is set up, and an area in which an evaluation unit 50 is set up and an area where the prescaler 54 is set up and an area where the control unit 58 is set up , Alternatively, these elements can be set up individually or grouped on separate FPGAs. In this way, the FPGA can also be used to adjust the power sources required for an LED light. For this purpose, further PWM units can generate a setpoint for the current sources or they can be directly PWM-modulated. This gives you an adjustable light with adjustable monitoring when using one or more FPGAs.
  • the invention particularly allows monitoring without one as in Fig. 2 shown analog actuator, an adjustment of limits, a parallel monitoring of multiple channels, a software-independent monitoring especially at runtime of an LED light and allows integration of an adjustable control of power sources.

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EP15153512.7A 2014-02-25 2015-02-02 Dispositif et son utilisation destiné à surveiller des éclairages à DEL Withdrawn EP2911477A1 (fr)

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DE102014102412.5A DE102014102412A1 (de) 2014-02-25 2014-02-25 Vorrichtung und deren Verwendung zur Überwachung von LED-Leuchten

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110234188A (zh) * 2019-05-08 2019-09-13 深圳市富满电子集团股份有限公司 Led驱动芯片的自动换挡调节电路

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Publication number Priority date Publication date Assignee Title
CN110234188A (zh) * 2019-05-08 2019-09-13 深圳市富满电子集团股份有限公司 Led驱动芯片的自动换挡调节电路

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