WO2012022649A1 - Commande d'une source de lumière - Google Patents

Commande d'une source de lumière Download PDF

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Publication number
WO2012022649A1
WO2012022649A1 PCT/EP2011/063624 EP2011063624W WO2012022649A1 WO 2012022649 A1 WO2012022649 A1 WO 2012022649A1 EP 2011063624 W EP2011063624 W EP 2011063624W WO 2012022649 A1 WO2012022649 A1 WO 2012022649A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage divider
divider
light source
ratio
converter
Prior art date
Application number
PCT/EP2011/063624
Other languages
German (de)
English (en)
Inventor
Bastian Dobler
Bernhard Reiter
Original Assignee
Osram Ag
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 Osram Ag filed Critical Osram Ag
Publication of WO2012022649A1 publication Critical patent/WO2012022649A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • 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]
    • H05B45/10—Controlling the intensity of the light

Definitions

  • the invention relates to a circuit and a method for controlling a light source. Furthermore, a
  • Projectors with semiconductor light elements e.g., LEDs
  • a current for operation of the light elements via digital-to-analog converter (also referred to as D / A converter) set or adjusted.
  • D / A converter digital-to-analog converter
  • An analog value generated by means of the D / A converter is applied via a voltage divider as the setpoint for driving a semiconductor light-emitting element (e.g.
  • the resolution or step size of the D / A converter is a measure of the change in current.
  • the D / AWandler can provide analog values in predetermined (equidistant) levels, with the analog value being a current for
  • the resolution (a variable step) of the D / A converter is a measure of how fine the current through the DAC
  • Semiconductor lighting element is adjustable.
  • the object of the invention is to avoid the abovementioned disadvantages and in particular to provide an efficient way of controlling a light source by means of a D / A converter.
  • the output side is connected to the voltage divider
  • the light source via the divider ratio of the voltage divider is controllable.
  • the light source may be a single one
  • Light source to multiple light sources, or to act a module with at least one light source.
  • the light source may e.g. a semiconductor light-emitting element, a light-emitting diode (LED) or another light-emitting element.
  • LED light-emitting diode
  • the divider ratio of the voltage divider is in particular variable, so that e.g. by changing at least one component of the voltage divider a
  • Range change of the signals provided by the D / A converter via the voltage divider (also referred to as setpoints) takes place.
  • Voltage divider is adjustable. For example, the individual digital steps or stages of the D / A converter in a first region in which the light source is driven with a low current, cause a smaller change in the desired value than in a second region in which the light source is driven with a larger current and, accordingly, brighter.
  • a further education is that (at least) one
  • the electronic switch can be an electronic
  • the electronic switch by means of a transistor, a MOSFET, a relay, or similar. be realized.
  • the voltage divider has at least two resistors, wherein in particular the light source via a signal which is applied between two resistors connected in series, can be controlled. It should be noted that the voltage divider may have any components that a division of the
  • Resistors to be inactive or inactive switchable ohmic resistors are inactive or inactive switchable ohmic resistors.
  • the divider ratio of the voltage divider is adjustable by another resistor in series with the at least two
  • Resistors is switchable.
  • the further resistor is arranged in series with the at least two resistors and parallel to the further resistor, a switch is provided which bridges the further resistor as needed.
  • additional resistor is switchable parallel to one of the at least two resistors.
  • the additional resistor in series with a switch can be parallel to at least one of the two
  • Resistors can be arranged. When the switch is closed, thus the additional resistance is in
  • control unit comprising the analog-to-digital converter, wherein the divider ratio of the voltage divider is controllable by means of the control unit.
  • At least one electronic switch is actuated, i. open or closed.
  • the control unit can be a
  • Microcontroller a processor, or similar act.
  • control unit comprises the D / A converter.
  • D / A converter As part of an additional training fits the
  • Control unit with a switching of the divider ratio of the voltage divider to a range of values of the input variables of the analog-to-digital converter.
  • Light source is possible without that occur due to the switching of the divider ratio brightness variations in the light source.
  • Each state of the voltage divider corresponds to one
  • Input variables compared to a target value for the control of the light source represents.
  • the height of the setpoint is dependent on the respective state of the voltage divider. If the voltage divider is changed, the characteristic also changes. For example, the slope of a characteristic changes with which the light source is driven by the A / D converter.
  • the adaptation of the input variables of the A / D converter preferably takes place in such a way that the
  • Control unit with a switching of the divider ratio of the voltage divider raises or lowers a range of values of the input variables of the analog-to-digital converter. It can thereby be achieved that no disturbing effects for a user occur when switching between divider ratios.
  • One embodiment is that the light source
  • Semiconductor lighting element or a module with at least one semiconductor element comprises.
  • a device for driving a light source comprising the circuit as described herein.
  • An embodiment consists in that the device is an operating consultant or a projector, in particular an LED projector.
  • Voltage divider is connected to an output of an analog-to-digital converter
  • An embodiment is that the divider ratio of the voltage divider is adjusted by means of at least one electronic switch, wherein the at least one electronic switch in particular of a
  • Control unit is controlled.
  • a development is that the divider ratio of the voltage divider is adjusted by an additional resistor is connected in parallel with one of at least two resistors.
  • FIG. 1 shows an exemplary circuit arrangement with a
  • a control unit comprising a microcontroller and a D / A converter, wherein at an output of the control unit, a signal or an analog value of the D / A converter for setting a light source is output;
  • FIG. 2 shows another exemplary circuit arrangement with a resistor that can be connected in series (switched on or off);
  • FIG. 3 shows an exemplary alternative circuit arrangement with a control unit comprising a
  • Microcontroller and a D / A converter schematically a diagram showing a normalized output of the D / A converter over n
  • adjustable digital values of the D / A converter (exemplified scaled to 8 bits) represents.
  • a D / A converter is proposed for driving a light source, in particular at least one semiconductor light-emitting element or at least one light-emitting diode (LED).
  • the control of the light source takes place by an analog Output signal of the D / A converter via a voltage divider a signal (eg a setpoint) to control the
  • the voltage divider is designed to be variable, so that by changing at least one component of the voltage divider a
  • the voltage divider can be realized for example by means of at least three resistors, wherein
  • one of the resistors can be connected in series with the other resistors and / or
  • At least one of the other resistors can be switched.
  • the switching function may e.g. by means of an electronic switch, e.g. a transistor, a mosfet, etc.
  • the switch may be of a control unit, such as a microcontroller, a processor, or similar. be controlled.
  • the control unit includes the D / A converter ⁇ or controls or the control unit monitors the D / A converter.
  • the light source can be used in a Leuchtpro ector.
  • the projector can be designed, for example, as an LED projector.
  • the LED projector has at least three separate light emitting diodes (red, green and blue), which are separately controllable.
  • a D / A converter can be provided for each of the separately controllable LEDs.
  • Fig.l shows an exemplary circuit arrangement with a control unit 101 comprising a microcontroller and a D / A converter.
  • a control unit 101 comprising a microcontroller and a D / A converter.
  • Control unit 101 is outputted with a signal or an analog value of the D / A converter for adjusting a light source (e.g., a semiconductor light emitting element).
  • a light source e.g., a semiconductor light emitting element
  • the output 107 is connected via a voltage divider comprising a series circuit of a resistor 104 to a resistor 105 to ground potential.
  • Mittenablik 108 of the voltage divider is a set value 102 for adjusting the current for the
  • a resistor 106 is in series with an electronic
  • Switch 109 is arranged.
  • the electronic switch 109 may be activated or deactivated via a control signal 103, the control signal being e.g. provided by the control unit 101.
  • the voltage divider comprising the resistors 104 and 105 can be changed by
  • FIG. 2 shows another exemplary circuit arrangement with a resistor 206 which can be switched on or off serially.
  • a control unit 201 includes a microcontroller and a D / A converter. At an output 207 of the control unit 201, a signal or an analog value of the D / A converter for adjusting a light source (e.g.
  • the output 207 is connected via a voltage divider comprising a series connection of a resistor 204 with a resistor 205 depending on a switching state of
  • Switch 209 either directly connected to ground potential or via the resistor 206 to ground potential.
  • the switch 209 is arranged parallel to the resistor 206 and can be activated via a control signal 203 or
  • a control signal being e.g. is provided by the control unit 201.
  • a set point 202 is provided for adjusting the current for the semiconductor light element. It should be noted that this setpoint 202 is e.g. over a
  • Switch 209 the divider ratio of the voltage divider and thus the value range of the setpoint 202 to
  • FIG. 3 shows an exemplary circuit arrangement with a control unit 301 comprising a microcontroller and a D / A converter.
  • a control unit 301 comprising a microcontroller and a D / A converter.
  • Control unit 301 a signal or an analog value of the D / A converter for adjusting a light source (eg, a semiconductor light emitting element) is output.
  • the output 307 is connected via a voltage divider comprising a series circuit of a resistor 304 to a resistor 305 to ground potential.
  • Center tap 308 of the voltage divider is a setpoint 302 for adjusting the current for the
  • this setpoint 302 is e.g. over a
  • a resistor 306 is arranged in series with an electronic switch 309.
  • the electronic switch 309 may be activated or deactivated via a control signal 303, the control signal 303 being e.g. provided by the control unit 301.
  • Switch 309 the divider ratio of the voltage divider and thus the range of the reference value 302 to
  • the voltage divider comprising the resistors 304 and 305 can be changed by
  • the voltage divider may comprise a plurality of devices, e.g. Resistors, e.g. parallel or in series with each of the components e.g. can be influenced by a additionally connectable or disconnectable component, the divider ratio of the voltage divider. Also, multiple devices may be singly or grouped (e.g., with multiple ones)
  • Fig. 1 is a diagram schematically showing a normalized output of the D / A converter versus n settable digital values of the D / A converter (scaled to 8 bits by way of example).
  • the switch 109 is closed in Fig.l, so that the D / A converter in conjunction with the
  • Output voltage can be adjusted linearly using the 256 values of the D / A converter (see curve 401).
  • the switch 109 in Fig.l is opened.
  • the D / A converter can now use its digital values to set other analog values, with a greater change in the setpoint between two digitally selectable values n and n + 1 than when switch 109 is closed.
  • curve 401 is suitable for fine tuning at low currents for operation of the semiconductor light-emitting element
  • curve 402 is suitably adapted for adjustment in a region in which the semiconductor light-emitting element is operated with a high current and, accordingly, between two
  • Adjustment of the digital value of the D / A converter takes place in such a way that strong or perceptible changes in the setpoint value for controlling the semiconductor light-emitting element are avoided. For example, a decrease or an increase of the value n can take place with or shortly before switching between different states of the
  • Voltage divider for example, to a quarter, can thus be achieved for this area instead of an 8-bit resolution, a resolution of 10-bit. Even higher resolution can be achieved by (further) changes of the voltage divider, in particular by cascaded switchable voltage dividers.
  • the present approach has the advantage that at low cost, an output of a D / A converter are connected in this way may be that a resolution or a range of values at the output of the D / A converter is changeable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un circuit de commande d'une source de lumière avec un diviseur de tension (104, 105), comportant un convertisseur analogique-numérique (101), qui est connecté du côté de la sortie au diviseur de tension (104, 105), le rapport diviseur du diviseur de tension (104, 105) étant réglable, la source de lumière pouvant être commandée par le rapport diviseur du diviseur de tension (104, 105). L'invention concerne en outre un procédé correspondant ainsi qu'un dispositif comprenant un tel circuit.
PCT/EP2011/063624 2010-08-20 2011-08-08 Commande d'une source de lumière WO2012022649A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010039613.3 2010-08-20
DE102010039613A DE102010039613A1 (de) 2010-08-20 2010-08-20 Ansteuerung einer Lichtquelle

Publications (1)

Publication Number Publication Date
WO2012022649A1 true WO2012022649A1 (fr) 2012-02-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/063624 WO2012022649A1 (fr) 2010-08-20 2011-08-08 Commande d'une source de lumière

Country Status (2)

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DE (1) DE102010039613A1 (fr)
WO (1) WO2012022649A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103987151A (zh) * 2013-02-12 2014-08-13 哈勒迈尔两合有限公司 用于灯具的控制***和控制装置及其组装***

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6396217B1 (en) * 2000-12-22 2002-05-28 Visteon Global Technologies, Inc. Brightness offset error reduction system and method for a display device
DE102007003145A1 (de) * 2007-01-22 2008-07-24 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung und Verfahren zum Erfassen elektrischer Größen
WO2009157763A2 (fr) * 2008-06-24 2009-12-30 Eldolab Holding B.V. Unité de commande pour un ensemble de diodes électroluminescentes et système d’éclairage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57125517A (en) * 1981-01-28 1982-08-04 Victor Co Of Japan Ltd Da conversion circuit
FR2560724B1 (fr) * 1984-03-02 1989-04-21 Trt Telecom Radio Electr Dispositif convertisseur numerique-analogique
DE4021131A1 (de) * 1990-07-03 1992-01-09 Zumtobel Ag Schaltungsanordnung und verfahren zum annaehern einer nichtlinearen uebertragungsfunktion
DE10112114C2 (de) * 2001-03-14 2003-02-27 Vossloh Schwabe Elektronik Steuereinrichtung für eine Beleuchtungseinrichtung
DE102008031429A1 (de) * 2008-07-04 2010-01-07 Schott Ag Dimmbares Leuchtdioden-System

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6396217B1 (en) * 2000-12-22 2002-05-28 Visteon Global Technologies, Inc. Brightness offset error reduction system and method for a display device
DE102007003145A1 (de) * 2007-01-22 2008-07-24 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung und Verfahren zum Erfassen elektrischer Größen
WO2009157763A2 (fr) * 2008-06-24 2009-12-30 Eldolab Holding B.V. Unité de commande pour un ensemble de diodes électroluminescentes et système d’éclairage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103987151A (zh) * 2013-02-12 2014-08-13 哈勒迈尔两合有限公司 用于灯具的控制***和控制装置及其组装***

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