DE10215472B4 - Method for operating a lighting device for vehicles with a lamp arrangement having at least one light-emitting diode and illumination device for vehicles - Google Patents

Method for operating a lighting device for vehicles with a lamp arrangement having at least one light-emitting diode and illumination device for vehicles

Info

Publication number
DE10215472B4
DE10215472B4 DE2002115472 DE10215472A DE10215472B4 DE 10215472 B4 DE10215472 B4 DE 10215472B4 DE 2002115472 DE2002115472 DE 2002115472 DE 10215472 A DE10215472 A DE 10215472A DE 10215472 B4 DE10215472 B4 DE 10215472B4
Authority
DE
Germany
Prior art keywords
current
time
pulse width
control
control unit
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.)
Active
Application number
DE2002115472
Other languages
German (de)
Other versions
DE10215472A1 (en
Inventor
Michael Groß-Bölting
Michael Scholz
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGAA Huek and Co
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.)
Filing date
Publication date
Application filed by Hella KGAA Huek and Co filed Critical Hella KGAA Huek and Co
Priority to DE2002115472 priority Critical patent/DE10215472B4/en
Publication of DE10215472A1 publication Critical patent/DE10215472A1/en
Application granted granted Critical
Publication of DE10215472B4 publication Critical patent/DE10215472B4/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B33/00Electroluminescent light sources
    • H05B33/02Details
    • H05B33/08Circuit arrangements not adapted to a particular application
    • H05B33/0803Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials
    • H05B33/0806Structural details of the circuit
    • H05B33/0821Structural details of the circuit in the load stage
    • H05B33/0824Structural details of the circuit in the load stage with an active control inside the LED load configuration
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B33/00Electroluminescent light sources
    • H05B33/02Details
    • H05B33/08Circuit arrangements not adapted to a particular application
    • H05B33/0803Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials
    • H05B33/0884Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials with monitoring or protection
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B33/00Electroluminescent light sources
    • H05B33/02Details
    • H05B33/08Circuit arrangements not adapted to a particular application
    • H05B33/0803Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials
    • H05B33/0884Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials with monitoring or protection
    • H05B33/089Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials with monitoring or protection of the load stage
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B37/00Circuit arrangements for electric light sources in general
    • H05B37/03Detecting lamp failure
    • H05B37/032Detecting lamp failure of a plurality of lamps connected in parallel
    • H05B37/034Detecting lamp failure of a plurality of lamps connected in parallel with communication between the lamps and a central unit
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
    • Y02B20/38Constructional details
    • Y02B20/383Adaptation to Edison sockets

Abstract

method for operating a lighting device for vehicles with at least one a light-emitting diode having lamp assembly, which via a Connecting cable connected to a control unit for power is, being from the control unit flowing to the lamp assembly Power from a power monitoring circuit for incandescent lamps in the control unit is measured to check the function of the lamp assembly, characterized characterized in that Current flow on the power line directly or indirectly by the control of a electrical load (current sink) is set, the pulse width (duty cycle: ratio from high-level-time to low-level-time) of a periodic signal in time according to the current characteristic to be simulated light bulb is modulated.

Description

  • The The invention relates to methods of operating a lighting device for vehicles with a lamp arrangement having at least one light-emitting diode to simulate the current characteristic, i. the temporal current course, in particular the cold inrush current of an incandescent lamp, wherein on a power line one of the current characteristic of the incandescent lamp at least more similar Current waveform is generated, which is measured by a current measuring circuit.
  • The Problem of the light bulb simulation emerges in particular in connection with flashing circuits, in which a conventional flasher used for driving and control from light bulbs is designed for the control and control of a lamp assembly can be used should, which has light-emitting diodes instead of incandescent lamps, since the current consumption of LEDs is much lower than that of incandescent lamps. This is the stream, from the flasher over the power line to the lamp assembly flows through an integrated current measuring circuit measured, with a current value below a certain threshold is rated as lamp failure.
  • The operation of LED lamp assemblies in conjunction with control circuits, which are actually designed for the operation of incandescent lamps, as well as the replica of the incandescent lamp current is also from the documents DE 43 14 127 C2 . US 6,150,771 A and CA 2 316 632 known.
  • In addition, it is from the post-published DE 101 07 578 A1 It is known to switch on an electrical load for a short time during the blinking pulse within a control time window parallel to the LED lamp arrangement, so that a current value which corresponds to the current value of the complex current characteristic of an incandescent lamp after switching on the incandescent lamp is simulated in pulses only for a specific time , However, this procedure requires that the current measuring circuit in the flasher unit has a control time window synchronized with the simulation time. However, the times at which the flashers in use control the flow during the flashing pulse vary so that adjustment to the flashers in use can not occur with a single simulation time or range.
  • task The invention therefore provides a method for operating a lighting device for vehicles with a lamp arrangement having at least one light-emitting diode specify with the in a simple and reliable way the entire current characteristic a light bulb at least approximately is reproduced.
  • These The object is achieved according to the invention by the current flow on the power line directly or indirectly by the control of a electrical load (current sink) is set, the pulse width (duty cycle: ratio from high-level-time to low-level-time) of a periodic signal in time according to the current characteristic to be simulated light bulb is modulated.
  • In a first preferred embodiment the periodic, pulse width modulated signal is the input of a Fed low-pass, being the smoothed Output voltage signal of the low pass then serves one over a Voltage level adjustable current sink to control, in turn ultimately a current flow the power line causes the course of a light bulb current characteristic equivalent.
  • In an alternative embodiment Switches the periodic, pulse width modulated signal directly on electrical load periodically to and from. This is about the Duration of the flash pulse is a temporally changing according to a light bulb current characteristic Rms value for generates the current, the frequency of the periodic control signal is higher as the highest Frequency, which is lethargic current sensing circuit in the flasher can.
  • Based the attached Drawings, the invention will be explained in more detail below. It shows:
  • 1 a block diagram of a lighting device in which the method according to the invention is applied,
  • 2 an LED lamp with failure control circuit and a fault pulse generator,
  • 3 the current profile on the power line between a ballast of the lighting device and an LED light to illustrate the fault current pulse,
  • 4 a current characteristic of an incandescent lamp traced by means of pulse width modulation according to the invention,
  • 5 a block diagram for the pulse width modulated control of an adjustable current sink with the interposition of a low-pass filter,
  • 6 the time course of the pulse width modulated control signal and the output signal of the low-pass filter.
  • 1 shows a lighting device for the method according to the invention is used. The illumination device consists of a lamp arrangement which has at least one light-emitting diode, preferably an LED matrix. Such a lamp arrangement may, for example, be a lamp or a headlight. This lamp arrangement is now connected via a single connection line (power line) to a control unit (eg a flasher unit), the current flowing from the control unit to the lamp arrangement being measured by a current monitoring circuit in the control unit for function control of the lamp arrangement. The lamp arrangement is connected upstream of a ballast, which is connected in the connecting line between the control unit, not shown, and the lamp arrangement. The lamp arrangement has a failure control circuit for the at least one LED and a pulse generator. In the event of a failure of at least one LED, the pulse generator generates a current or voltage pulse on the connecting line in order to indicate the fault to the ballast. In the ballast is the electrical load (current sink) with the help of the light bulb, more precisely, the current characteristic of an incandescent lamp, is simulated. In the in 1 In the illustrated embodiment, the simulation of the incandescent lamp characteristic is effected in that the "simulation load" is periodically and pulse-width modulated via a switch, preferably a semiconductor switch, controlled by a control and monitoring circuit arranged in the ballast, the current monitoring circuit in the control unit being only capable of RMS measures now not directly the current flowing into the lamp assembly, but the inventively set RMS current flowing into the ballast.This is additive from the LED current of the lamp assembly and the current through the ballast connected in parallel load, In addition, a circuit for detecting the error pulse generated by the pulse generator is provided in the ballast circuit, for example, a current measuring circuit which simulates the current through an incandescent lamp determines the residual current pulse via a shunt resistor and sends a corresponding signal to the control and monitoring circuit in the ballast. The control and monitoring circuit then prevents in the event of an error, the periodic, pulse width modulated switching of the load. As a result, no more incandescent lamp current is simulated and the current monitoring circuit in the controller correctly detects a fault in the lamp assembly. It must be generated by the switchable load only a current flow at a height corresponding to the difference between the incandescent lamp current to be simulated and the current in the lamp assembly, since the current is present in the LED lamp assembly as an offset anyway. In this connection, the current measuring circuit in the ballast measures not only the residual current pulse but also the current in the LED lamp assembly.
  • Of the Current pulse generated in case of failure of at least one LED, is generated in a certain time window during the blinking pulse, wherein the detection circuit in the ballast has a control time window, that with the time window for the generation of the residual current pulse is synchronized. If the Detection circuit within the control window a fault current detected, the "simulation load" is no longer activated it is in one embodiment for example, provided in the event of a failure error 100 milliseconds after the start of the flashing pulse an error impulse of 10 to 20 Milliseconds duration to generate. After the first blink after In the event of a failure, the "simulation load" will be switched on detected error pulse is however from the control and monitoring circuit stored so that the Connecting the "simulation load" already at the next blinking pulse is omitted and so the error is detected by the controller / flasher. To the error information also during the Blink break, in which even the ballast does not use electrical energy is supplied in the control and monitoring circuit (e.g. a microcontroller) to store, is in the ballast an electrolytic capacitor (not shown) provided as a supply buffer.
  • For failure check (see 2 ), for example, the currents through the parallel strings of the LED matrix are compared. Only if the currents do not match within a certain tolerance range, because one LED has failed in one strand, an error signal is forwarded to the pulse generator.
  • 4 illustrates the relationship according to the invention between the course of an incandescent lamp current characteristic to be simulated and the pulse width modulation. In this case, the pulse width (duty cycle) after switching on the flash pulse (switching on the connecting line / power line) to replicate the Kaltteinschaltstromspitze decreases with increasing time. Thus, a plurality of successive periods of time are provided, wherein each time section is assigned a specific pulse width and decreases the pulse width in the temporally successive time intervals. However, it is also envisaged that the pulse width decreases almost continuously. To simulate the Kalteinschaltstromspitze it has been found that it is advantageous if the pulse width at the beginning of the flash pulse is almost 100% and towards the end of the flash pulse only about 10%.
  • In 5 a particularly advantageous embodiment of the invention is shown. According to this embodiment, the periodic, pulse width modulated control signal is supplied to the input of a low-pass filter, wherein the output signal of the low-pass filter with its voltage level (see. 6 ) drives an adjustable current sink. Such adjustable current sinks are known in the art.

Claims (6)

  1. Method for operating a lighting device for vehicles with a lamp arrangement having at least one light-emitting diode, which is connected via a connecting line to a control unit for power supply, wherein the current flowing from the control unit to the lamp assembly current is measured by a current monitoring circuit for incandescent lamps in the control unit for functional control of the lamp assembly, characterized characterized in that the current flow on the power line is set directly or indirectly by the control of an electrical load (current sink), wherein the pulse width (duty cycle: ratio of high-level-time to low-level-time) of a periodic signal corresponding in time is simulated to be simulated current characteristic of an incandescent lamp.
  2. Method according to claim 1, characterized in that after the Switching on the power line to simulate the cold inrush current a light bulb the pulse width modulation of the control signal is such that the pulse width decreases as time progresses.
  3. Method according to claim 2, characterized in that after the Turn on the power line two or more consecutive Time intervals are provided, each time period a specific Pulse width is assigned, and wherein the pulse width in the temporal decreases in successive time periods.
  4. Method according to one of the preceding claims, characterized that this periodic, pulse width modulated signal to the input of a low pass supplied is, wherein the output signal of the low pass an adjustable Current sink activates.
  5. Method according to one of the preceding claims 1 to 3, characterized that the periodic, pulse width modulated control signal periodically an electrical load switches on and off and thus effectively a current curve accordingly the current characteristic of a light bulb generated, wherein the frequency of the periodic control signal is higher than the highest Frequency, which is the current measuring circuit dissolve can.
  6. Lighting device for Vehicles with a lamp arrangement having at least one light-emitting diode, which over a connecting line connected to a control unit for power supply is, being from the control unit flowing to the lamp assembly Power from a power monitoring circuit for incandescent lamps in the control unit for Functional control of the lamp assembly is measured, characterized that the current flow on the Power line directly or indirectly by the control of an electrical Load (current sink) is set, the pulse width (duty cycle: relationship from high-level-time to low-level-time) of a periodic signal modulated in time according to the current characteristic of an incandescent lamp to be simulated becomes.
DE2002115472 2002-04-09 2002-04-09 Method for operating a lighting device for vehicles with a lamp arrangement having at least one light-emitting diode and illumination device for vehicles Active DE10215472B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2002115472 DE10215472B4 (en) 2002-04-09 2002-04-09 Method for operating a lighting device for vehicles with a lamp arrangement having at least one light-emitting diode and illumination device for vehicles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2002115472 DE10215472B4 (en) 2002-04-09 2002-04-09 Method for operating a lighting device for vehicles with a lamp arrangement having at least one light-emitting diode and illumination device for vehicles

Publications (2)

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DE10215472A1 DE10215472A1 (en) 2003-11-06
DE10215472B4 true DE10215472B4 (en) 2007-08-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007052434A1 (en) 2007-11-02 2009-05-07 Hella Kgaa Hueck & Co. Method for dimming a light-emitting diode arrangement of a motor vehicle

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004027351B3 (en) * 2004-06-01 2006-01-19 Siemens Ag Circuit arrangement for operating an LED signal generator
GB2417788A (en) * 2004-09-06 2006-03-08 Lights And Signals Ltd Emulation circuit for a low energy lamp
DE102004045435B4 (en) * 2004-09-18 2008-07-31 Man Nutzfahrzeuge Ag Monitoring the function of incandescent or LED lights in motor vehicles
GB2429542B (en) * 2005-08-25 2008-02-27 Lights And Signals Ltd Emulation circuit
DE102006042470A1 (en) * 2006-09-09 2008-03-27 Hella Kgaa Hueck & Co. Circuit arrangement for use for simulating load of direction indicator lamp of motor vehicle, has partial loads producing constant current with voltages, and another partial load providing current, which linearly dependent on voltage
EP2000358B1 (en) * 2007-06-01 2016-08-03 ConWys AG Circuit for supplying power to LED in a trailer
DE202007007777U1 (en) 2007-06-01 2007-08-16 Conwys Ag Circuit arrangement for interconnection with towing vehicle and trailer of vehicle train electrical connection, has input connector designed for load by lamp, and potentiometer provided between input connector and output connector
DE102008042595B3 (en) * 2008-10-02 2009-11-26 Carsig GbR (Vertretungsberechtigter Gesellschafter: Herr Thomas Kliem, 78628 Rottweil) Light i.e. rear wall light, monitoring method for e.g. passenger car, involves simulating filament lamp in regulating circuit by load switched parallel to light i.e. LED, where circuit restores part of power consumed during simulation
DE102010064149A1 (en) * 2010-12-24 2012-06-28 Johann & Konen Gmbh & Co. Kg Method for ensuring the correct evaluation of LED lights in combination with vehicle on-board computers
EP2884821A3 (en) * 2013-12-10 2015-07-29 Transport-Teknik A/S Control circuit for light sources in vehicles
DE102017207346A1 (en) * 2017-05-02 2018-11-08 Osram Gmbh Controlling at least one bulb of a vehicle headlamp, depending on an electrical size available on a vehicle headlamp connection of a vehicle

Citations (6)

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DE4232545C2 (en) * 1992-09-29 1995-03-16 Blaupunkt Werke Gmbh Device for illuminating of operating and / or display elements
DE4314127C2 (en) * 1993-04-29 1996-10-17 Loesch Reiner System for simulation of a real electrical load and handset as a system component
US6150771A (en) * 1997-06-11 2000-11-21 Precision Solar Controls Inc. Circuit for interfacing between a conventional traffic signal conflict monitor and light emitting diodes replacing a conventional incandescent bulb in the signal
CA2316632A1 (en) * 2000-08-22 2002-02-22 Harmon Industries, Inc. Signal interface module
US20020033702A1 (en) * 1999-11-19 2002-03-21 Gelcore, Llc Method and device for remote monitoring of LED lamps
DE10107578A1 (en) * 2001-02-17 2002-08-29 Hella Kg Hueck & Co Lighting system for motor vehicles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4232545C2 (en) * 1992-09-29 1995-03-16 Blaupunkt Werke Gmbh Device for illuminating of operating and / or display elements
DE4314127C2 (en) * 1993-04-29 1996-10-17 Loesch Reiner System for simulation of a real electrical load and handset as a system component
US6150771A (en) * 1997-06-11 2000-11-21 Precision Solar Controls Inc. Circuit for interfacing between a conventional traffic signal conflict monitor and light emitting diodes replacing a conventional incandescent bulb in the signal
US20020033702A1 (en) * 1999-11-19 2002-03-21 Gelcore, Llc Method and device for remote monitoring of LED lamps
CA2316632A1 (en) * 2000-08-22 2002-02-22 Harmon Industries, Inc. Signal interface module
DE10107578A1 (en) * 2001-02-17 2002-08-29 Hella Kg Hueck & Co Lighting system for motor vehicles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007052434A1 (en) 2007-11-02 2009-05-07 Hella Kgaa Hueck & Co. Method for dimming a light-emitting diode arrangement of a motor vehicle

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
8127 New person/name/address of the applicant

Owner name: HELLA KGAA HUECK & CO., 59557 LIPPSTADT, DE

8364 No opposition during term of opposition
R081 Change of applicant/patentee

Owner name: HELLA GMBH & CO. KGAA, DE

Free format text: FORMER OWNER: HELLA KGAA HUECK & CO., 59557 LIPPSTADT, DE