EP2499882A1 - Schaltungsanordnung für eine led-lichtquelle - Google Patents
Schaltungsanordnung für eine led-lichtquelleInfo
- Publication number
- EP2499882A1 EP2499882A1 EP10788000A EP10788000A EP2499882A1 EP 2499882 A1 EP2499882 A1 EP 2499882A1 EP 10788000 A EP10788000 A EP 10788000A EP 10788000 A EP10788000 A EP 10788000A EP 2499882 A1 EP2499882 A1 EP 2499882A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- emitting diode
- circuit
- diode module
- voltage
- 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.)
- Granted
Links
- 230000005669 field effect Effects 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000005670 electromagnetic radiation Effects 0.000 claims description 2
- 230000002441 reversible effect Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 18
- 238000005259 measurement Methods 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 244000261422 Lysimachia clethroides Species 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
Definitions
- the present invention relates to a light emitting diode module with a circuit arrangement for driving an LED light source, which is particularly suitable for use in
- LED light sources are becoming increasingly important in the lighting sector.
- the relative to conventional halogen lamps relatively high efficiency and associated relatively low heat radiation and the mechanical robustness and longevity of the individual light-emitting diodes are particularly suitable for use in transportation, for example, as lighting means in a passenger cabin in airplanes, ships, railway cars, etc ..
- spot illumination with a brightness of usually 150-250 lx at a distance of 40-50 cm the LED light sources are particularly well suited as reading lights (in English reading lights) in passenger aircraft.
- the light-emitting diode allows comparatively diverse possibilities with regard to a functional design and the installation location of a respective luminaire.
- the conventional halogen reading lights in the overhead area are replaced by LED reading lights, which are preferably attached with a gooseneck directly to a passenger seat and have an LED module in a bulb head.
- LED reading lights Such a reading light is characterized in particular by the
- the light emitting diodes of a respective LED module usually require a driver circuit for setting a suitable operating point, with which a. , voltage supplied from a vehicle electrical system is adapted to the forward voltage of an LED and the constant regulates the diode current.
- LED modules In aviation (English aviation), high demands are generally placed on electrical and electronic equipment with regard to EMC (Electromagnetic Compatibility). Conducted disturbances, as well as space disturbances, must meet the requirements of the aviation standards of, for example, the RTCA-DO160 or customer specifications such as Boeing's D6-36440 or Airbus ABD0100.
- Known LED modules therefore typically include linear voltage regulators, which provide a voltage difference between the diode forward voltage and the supplied vehicle electrical system voltage
- Heat radiation of the LED module are also required by the mentioned standards to comply with limit values.
- the touch temperature of an aluminum enclosure of an LED module may exceed the ambient temperature by a maximum of 7 ° C.
- ISPS in-seat power supplies
- USB Universal Serial Bus
- a currently used in aviation LED module with a linear voltage regulation is, taking into account a maximum tolerable power loss in each case only for a certain nominal voltage used.
- LED lamps are preferably equipped with a multi-LED module. which includes several series connected LEDs. The series connection of several LEDs allows a larger voltage drop, so that the linear voltage regulator has to absorb less power loss.
- 1-LED modules can only be used in the aviation sector for small supply voltages. Compared to the multi-LED modules, they are characterized by a more homogeneous distribution of brightness in their cone of light, so that their use also on larger
- a major disadvantage of the known LED lights is that for each of the different vehicle electrical systems, ie for the different voltage ranges, a separate LED module with an adapted LED configuration and an adapted voltage regulator can be developed got to. This is particularly disadvantageous in view of the time and technically complicated acceptances or tests for aviation approval. In addition, it is important for a direct operation on a vehicle electrical system special
- US Pat. No. 7,148,632 B2 describes a light-emitting diode module which activates three groups of LEDs, each of which emits a different light color and whose intensity is adjustable. With provided procedures color and power can be calibrated.
- This device has a voltage module for a voltage range of 23 V to 33 V, which noticeably limits its range of application.
- Charge pump assembly to compensate for the voltage drop of a DC battery and thereby the
- FIG. 2 of this publication shows that this arrangement compensates for a voltage range of approximately 3.4 to 2.4 V, which is completely unsuitable for the purposes of the aviation industry, for example.
- US 2008/0054862 A1 describes an electronic device with a DC voltage supply, in which the Spännung a feeding battery is controlled by suitable converter for a load to be supplied.
- the present invention proposes a light-emitting diode module having a housing and at least one.
- Circuit board comprises, wherein the housing is preferably made of aluminum or a flame retardant plastic.
- the printed circuit board has at least one light-emitting diode, an LED driver and a drive module, as well as a circuit arrangement.
- the LED driver provides a constant working point for one through the
- the circuit arrangement comprises an input for switching on a first voltage and a DC / DC converter as well as a bypass connected in parallel with the DC / DC converter, which by means of a
- the drive module on the one hand be designed as a PWM module.
- the drive module on the other hand as a mechanical switch or button
- the switch or pushbutton can be used either as a mechanical switch or pushbutton or as a semiconductor switch
- the comparator circuit is preferably between the
- Input and the down converter module arranged, and adapted to the height of an input voltage of the
- Detect circuitry and compare with a first and second threshold.
- Comparator circuit is further. trained to attend
- the present invention thus provides over the prior art, a universal light-emitting diode module, which can be used as a light source in various lighting devices in aviation technology.
- the very complex approval procedure for such electronic components is therefore only once again, which is in view of the low numbers typical for aviation technology
- the wide voltage range of the light-emitting diode module additionally offers the decisive advantage that fluctuations in the supply voltage provided on the electrical system side without Brightness fluctuations are processed by the light source. If, for example, in the case of a generator failure, the vehicle electrical system voltage drops from 28 V to 24 V in battery mode, the light-emitting diode module according to the invention also provides its full lighting intensity in emergency mode, as a result of which it is also preferred as an entrance light . suitable.
- An advantageous embodiment provides to use a DC / DC converter in the form of an integrated buck converter module.
- the invention provides to expand the circuit board of the light emitting diode module as a multipart circuit board, wherein the
- Leiteplattenabitese can thus be folded in the housing of a light emitting diode module to be installed and take only a maximum volume of 12 cm 3 .
- Surge protection circuit includes a
- Field effect transistor includes, which limits the supply voltage in the event of overvoltage.
- Light emitting diode module is between the input and the first filter circuit at least one suppressor diode, at least one varistor or a combination of suppressor diode and Varistor arranged.
- suppressor diodes react very quickly to overvoltages, but can absorb relatively little energy, although varistors react somewhat more slowly, but can absorb more energy for this purpose.
- Light emitting diode module are a plurality of suppressor diodes and / or varistors on the light emitting diode and other components of the LED board on the output side and / or input side between the input and the first filter circuit
- Fig. 1 a block diagram of a
- Wide-range voltage module for a
- Fig. 3 a detailed circuit diagram of an alternative
- 4 shows a circuit diagram of an LED board
- 5 shows a 3D sectional view of a light-emitting diode module with an axial light exit opening
- FIG. 6 shows a 3D sectional view of a light-emitting diode module with a radial light exit opening
- Fig. 7 a measurement diagram for the space-bound
- Fig. 8 a measurement diagram for the conducted
- FIG. 1 is the block diagram of a
- the illustrated range voltage module which is comprised of a light emitting diode module according to the invention with a 1-LED light source.
- the light-emitting diode module fulfills the requirements of the RTCA-DO160E and is thus suitable
- the illustrated wide-range voltage module includes an input terminal pair XI .3 and XI.2, at which a 4.5 V to 32.5 V DC voltage is provided from a vehicle electrical system.
- the module includes a single one
- High-performance LED Dil operated with a U4 LED driver and a driver, dimmable.
- the brightness is controlled by a button or switch 12 or by an external connection to the XI .1 connector
- Control unit adjustable.
- a DC / DC converter U1 with a parallel-connected bypass 11 provides a DC voltage in the range between 4 V and 8 V for supplying the drive module and the LED driver.
- a filter and protective zeschlaltung is provided, with which overvoltages and high-frequency disturbances are filtered.
- FIG. 2 shows a detailed circuit diagram of a wide-range voltage module.
- the illustrated circuit can essentially be divided into two parts, wherein the upper area shows a voltage supply circuit S1, at whose output a voltage UA between 4 V and 8 V DC is available, and the universal one at a
- Any input voltage in a voltage range of 4.5 V to 32.5 V DC can be operated. At the bottom
- Section of Figure 2 is an LED driver circuit
- Brightness regulation of the high-power light-emitting diode Dil includes.
- the power supply circuit Sl has input side via a three-pin connector XI, wherein at two of the electrical contacts XI .3 and XI .2 an input voltage is provided.
- This input voltage may be a 5V DC voltage from an in-seat power supply (ISPS), for example, locally powered in an in-seat passenger-mounted infotainment system, or a 28V DC voltage, typically from an on-board electrical system in a cabin a commercial aircraft is provided and serves to supply a variety of electrical consumers.
- Terminal XI.2 provides the ground potential (GND) for the circuit, the positive one Input voltage potential is applied to terminal XI .3, whereby this live input line is protected against overcurrents by a fuse Sil.
- the voltage supply circuit S1 has overvoltage protection in its input region, which is suitable for filtering transient voltage peaks, which are generated, for example, by switching operations within the
- Breaking voltage is designed for the maximum input voltage of the power supply circuit.
- Bidirectional ESD Protection Diodes can also be used, as these diodes also provide very fast reaction times with low power losses.
- the diode D18 in FIG. 2 is one such
- the output of the voltage supply circuit Sl is preferably operated with a 4 V DC voltage provided by a DC / DC down converter.
- the invention proposes a buck converter
- Mass capacitors C4, C5 must be complemented.
- the output voltage of the buck converter is connected to the Resistor R5. set.
- the resistor R17 provides a base load for the buck converter.
- the necessary inductance is also integrated. Due to the short lines within the interconnect level of an IC, the spurious emission typically caused by a transducer can be minimized so that only the conducted disturbances from the IC need to be reduced to aviation requirements.
- a first filter S2 is provided in the voltage supply circuit S1, the input side next to the suppressor diode D5 is arranged and from the components C2, C17 and L2
- An additional second filter S5 is provided directly at the voltage input of the converter and comprises the capacitances Cl and C3 as well as the inductance LI.
- the presently known integrated down-converter Ul require an input voltage of at least 7 V. Nevertheless, the wide lying between 4.5 V to 32.5 V DC
- Voltage supply circuit Sl a bypass circuit present, with an input voltage up to about 4 V directly through the MOS transistor VI can be switched to the output, provided that it has a voltage below 7V.
- the transistor VI is connected via a
- the transistor V4 is coupled via the voltage divider with the resistors R3 and R8 to the input circuit, wherein the voltage divider is dimensioned such that the transistor in the entire input voltage range of 4.5 V to 32.5 V is conductive and a voltage for the transistor V5 provides.
- the capacitance C16 is provided which, for high-frequency signals which superimpose the input DC voltages, alters the divider ratio of the voltage divider such that the voltage drop across the parallel form of R3 and C16 drops below the threshold voltage of the transistor V4, thus blocking it becomes.
- the detection of the switching threshold for the input voltage of the present voltage supply circuit Sl is provided by the transistor V5, the resistors R2 and R6 and the Zener diode D7.
- an input voltage between 32.5 V and approximately 7.5 V
- a voltage which is sufficiently high for switching on the transistor R2 drops across the resistor R2, which is connected in parallel with the base-emitter diode of the transistor V5.
- the transistor V5 blocks and the gate potential of the transistor VI is pulled to ground (GND).
- the thus applied negative gate-source voltage which is below the threshold voltage of the PMOS transistor VI, lets the transistor through, so that the bypass circuit is activated.
- a resistor Rl is connected to the resistors R2 and R6 of the Switching threshold detection is connected .
- the resistor Rl forms a parallel circuit with the resistor R2, so that the divider ratio is changed in the switching threshold detection such that to re-become conductive of the transistor V5 a
- Input voltage of at least 8 V must be.
- a hysteresis is provided which is about 0.5 V and in the transition region, an uncontrolled back and forth
- LED Drive circuit for a 1-LED light source shown.
- This comprises a LED driving chip U4, which operates the Dil LED pulsed at a constant operating point of its U / I characteristic line and is directly operated with a voltage of 4 V to 8 V DC from the power supply circuit.
- the basic setting of the LED current is carried out by means of the resistors R15 and R16, which have a basic brightness of Specify LED Dil. This basic brightness of
- LED Dil can be changed via a variable P M signal which is provided to the driver module by a P M block.
- This PWM module can, for example, in the form of a ikrokontrollers U5
- a value for a desired ' LED brightness via a button 12 is adjustable.
- the microcontroller U5 is supplied with a 3 V DC voltage from a voltage regulator module U6, from which also the operating voltage for a driver circuit U2 is provided.
- the driver circuit U2 drives a standard LED, which is integrated as lighting means in the button 12.
- the terminal XI .1 of the wide-range voltage module allows setting or changing the brightness of an external second operating unit, which has an identical function to the button 12.
- Field effect Transisotrs V2 connected so that it is controlled high impedance at an overvoltage at the input XI and thereby for the downstream of this modules limits the supply voltage applied thereto, in particular limited to harmless values for the downstream modules.
- Field-effect transistor V2 can safely protect the downstream components from overvoltages during operation on the vehicle electrical system, even with a longer overvoltage
- At least one suppressor diode D5 at least one varistor or a combination of suppressor diodes and varistors is arranged between the input (XI) and the first filter circuit (S2), which are not shown in the drawings except for the diodes D5.
- the input (XI) the input (XI) and the first filter circuit (S2), which are not shown in the drawings except for the diodes D5.
- these diodes D5 can also be Bidirectional ESD Protection Diodes, like these
- Varistors on the light-emitting diode Dil see Figure 4, and other components of the LED board output side and / or input side between the input XI and the first Filter circuit (S2) and / or be arranged between the input (X2) and the LED driver U4.
- FIG. 3 shows by way of example a circuit U4 '
- FIG. 4 shows by way of example three suppressor diodes D5, which are connected in parallel with the light-emitting diode Dil, parallel to the switch or pushbutton 11 and parallel to the light-emitting diode D16, which serves for the key illumination.
- the low emission of electromagnetic interference required in the aviation sector is ensured by an aluminum housing which is grounded at low impedance and picks up the circuit with the light-emitting diode.
- the housing can be installed with the entire circuit in a preferred embodiment in a 12 cm 3 head of a reading light.
- the housing can also be made of a flame-retardant plastic.
- FIG. 5 shows a light-emitting diode module 30 with an axial light exit opening.
- the module 30 comprises a housing 41 made of aluminum, with a light-emitting diode Dil and a lens 32.
- Wide-range voltage module is constructed of two printed circuit boards 10a and 10b, which are electrically and mechanically related to a flexible portion, not shown, and thus forming a foldable printed circuit board unit.
- FIG. 6 shows an alternative light-emitting diode module 40 which has a light exit opening aligned in the radial direction with a lens 42.
- the power supply circuit Sl additionally includes a prescribed Verpolungsschut circuit S3, which is arranged in front of the comparator circuit S4 in the circuit diagram.
- a reverse polarity protection z is realized by a diode connected in the load circuit.
- the MOS transistor V3 is switched into the load circuit, at which a much lower voltage and power dissipation drops in the passband.
- the voltage drop is controlled by the Zener diode D3.
- FIG. 7a shows the emission of a light-emitting diode module at full light power and a supply voltage of 5 V.
- FIGS. 7b to 7d were each carried out at a voltage of 28V.
- Figures 7b and 7d show the spectra at full luminosity, wherein in the diagram 7d, the wide-range voltage module was measured without housing.
- the measurement of the graph 7c was performed at 60% luminance of the LED.
- Diagrams 7e and 7f show further measurement results of the wide-range voltage module without
- Figures 8a to 8d show the conducted
- Diagram 8a shows the spectrum at a
- the diagrams 8b to 8d show the respective Freguenzspektrum with an input voltage of 28 V DC.
- Light emitting diode module performed.
- the measured values of FIGS. 8c and 8d were performed at 60% of the maximum light output.
- Figure 9 illustrates the stability of the brightness of a
- Light emitting diode module as a function of input voltage from 3.7 V to 35 V, the only surprisingly small
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009052836A DE102009052836A1 (de) | 2009-11-13 | 2009-11-13 | Schaltungsanordnung für eine LED-Lichtquelle |
US26151809P | 2009-11-16 | 2009-11-16 | |
PCT/EP2010/006934 WO2011057813A1 (de) | 2009-11-13 | 2010-11-15 | Schaltungsanordnung für eine led-lichtquelle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2499882A1 true EP2499882A1 (de) | 2012-09-19 |
EP2499882B1 EP2499882B1 (de) | 2015-01-07 |
Family
ID=43877549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10788000.7A Not-in-force EP2499882B1 (de) | 2009-11-13 | 2010-11-15 | Schaltungsanordnung für eine led-lichtquelle |
Country Status (5)
Country | Link |
---|---|
US (1) | US9516711B2 (de) |
EP (1) | EP2499882B1 (de) |
CN (1) | CN102714895B (de) |
DE (1) | DE102009052836A1 (de) |
WO (1) | WO2011057813A1 (de) |
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DE102007018224A1 (de) * | 2007-04-16 | 2008-10-23 | Schott Ag | LED-Leuchte mit stabilisiertem Lichtstrom und stabilisierter Lichtfarbe |
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2009
- 2009-11-13 DE DE102009052836A patent/DE102009052836A1/de not_active Withdrawn
-
2010
- 2010-11-15 EP EP10788000.7A patent/EP2499882B1/de not_active Not-in-force
- 2010-11-15 WO PCT/EP2010/006934 patent/WO2011057813A1/de active Application Filing
- 2010-11-15 US US13/509,475 patent/US9516711B2/en active Active
- 2010-11-15 CN CN201080051533.2A patent/CN102714895B/zh not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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See references of WO2011057813A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102714895A (zh) | 2012-10-03 |
CN102714895B (zh) | 2015-11-25 |
DE102009052836A1 (de) | 2011-05-19 |
US9516711B2 (en) | 2016-12-06 |
EP2499882B1 (de) | 2015-01-07 |
WO2011057813A1 (de) | 2011-05-19 |
US20120319612A1 (en) | 2012-12-20 |
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