EP2312912A2 - Circuit for a temperature control of a LED diode - Google Patents

Circuit for a temperature control of a LED diode Download PDF

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Publication number
EP2312912A2
EP2312912A2 EP10468002A EP10468002A EP2312912A2 EP 2312912 A2 EP2312912 A2 EP 2312912A2 EP 10468002 A EP10468002 A EP 10468002A EP 10468002 A EP10468002 A EP 10468002A EP 2312912 A2 EP2312912 A2 EP 2312912A2
Authority
EP
European Patent Office
Prior art keywords
circuit
signal
generated
led diode
regulator
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Withdrawn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
EP10468002A
Other languages
German (de)
French (fr)
Inventor
Dragotin Kuster
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.)
Technoplast d o o
Original Assignee
Technoplast d o o
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 Technoplast d o o filed Critical Technoplast d o o
Publication of EP2312912A2 publication Critical patent/EP2312912A2/en
Withdrawn legal-status Critical Current

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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]
    • H05B45/40—Details of LED load circuits
    • 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
    • H05B45/18—Controlling the intensity of the light using temperature feedback

Definitions

  • the subject of the invention is a circuit for a temperature control of a LED diode providing a possibility of changing luminous intensity of the LED diode as a function of ambient temperature.
  • the described circuit can be used for controlling illumination as well, e.g. of car lamps and car fog lamps.
  • the invention belongs to class F21V29/00 of the international patent classification.
  • the technical problem successfully solved by the circuit of the invention is high sensitivity of the luminous intensity of a LED diode to ambient temperature and consequently increase/decrease of the luminous intensity of LED diodes.
  • a solution to set technical problem relates to a problem of heating of luminous elements comprising LED diodes.
  • a problem of excess heating of luminous elements comprising one or several LED diodes needs to be solved by means of adequate mechanical cooling systems or a structure of a housing of luminous elements that are effective in deflecting heat.
  • the circuit of the invention detects the temperature of a chip of the LED diode and controls the increase/decrease of the current running through the LED diode.
  • a circuit for a temperature control of a LED diode generating an analogue voltage signal as a function of detected temperature on a sensor circuit 1 consisting of an NTC and a PTC resistor.
  • This signal is compared to a ramp frequency, which is internally set on a regulator 3.
  • a ramp frequency which is internally set on a regulator 3.
  • an adequate signal of the regulator 3 is generated at the output terminal of the regulator 3, said signal opening a FET transistor and a diode port in an adequate width, through which current flows, the size of the current depending on the width of the signal of the regulator 3 generated as a function of detected temperature on the sensor circuit 1.
  • Figure 2 shows curves representing the situation on NTC and PTC resistors and the curve of voltage and current through the LED diode and herewith sensitivity of the luminous intensity of the LED diode to temperature.
  • the circuit of the invention operates in the entire temperature range between -40° and 105°. Proper operation of the circuit of the invention is subject to adequate cooling by means of a cooler that can be arranged on the bottom side under the LED diode.

Landscapes

  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The subject of the invention is a circuit for a temperature control of a LED diode providing a possibility of changing luminous intensity of the LED diode as a function of ambient temperature, wherein an analogue voltage signal is generated as a function of detected temperature on a sensor circuit (1), wherein this signal is compared to a ramp frequency, which is internally set on a regulator (3) by means of a resistor (2) and the signal of the regulator (3) generated based on the intersection point between the ramp frequency and the generated analogue voltage signal determines the current, the size of which depends on the width of the signal of the regulator (3) generated as a function of detected temperature on the sensor circuit (1). Figure 3 should appear in publication.

Description

  • The subject of the invention is a circuit for a temperature control of a LED diode providing a possibility of changing luminous intensity of the LED diode as a function of ambient temperature. The described circuit can be used for controlling illumination as well, e.g. of car lamps and car fog lamps. The invention belongs to class F21V29/00 of the international patent classification.
  • The technical problem successfully solved by the circuit of the invention is high sensitivity of the luminous intensity of a LED diode to ambient temperature and consequently increase/decrease of the luminous intensity of LED diodes.
  • A solution to set technical problem relates to a problem of heating of luminous elements comprising LED diodes. A problem of excess heating of luminous elements comprising one or several LED diodes needs to be solved by means of adequate mechanical cooling systems or a structure of a housing of luminous elements that are effective in deflecting heat.
  • The circuit of the invention detects the temperature of a chip of the LED diode and controls the increase/decrease of the current running through the LED diode. By applying an adequate combination of NTC and PTC resistors and belonging elements for a proper functioning of the circuit it is possible to prepare such control voltage curve that will adequately generate current through the LED diode as a function of temperature of the chip of the LED diode.
  • The invention will now be explained in more detail by way of an embodiment and the belonging drawings, representing in:
    • Figure 1 a block diagram of the circuit of the invention;
    • Figure 2 curve of dependence of luminous intensity on the temperature of the LED diode;
    • Figure 3 control circuit structure.
  • According to the invention the problem is solved by a circuit for a temperature control of a LED diode generating an analogue voltage signal as a function of detected temperature on a sensor circuit 1 consisting of an NTC and a PTC resistor. This signal is compared to a ramp frequency, which is internally set on a regulator 3. Based on the intersection point between the ramp frequency and the generated analogue voltage signal an adequate signal of the regulator 3 is generated at the output terminal of the regulator 3, said signal opening a FET transistor and a diode port in an adequate width, through which current flows, the size of the current depending on the width of the signal of the regulator 3 generated as a function of detected temperature on the sensor circuit 1.
  • Figure 2 shows curves representing the situation on NTC and PTC resistors and the curve of voltage and current through the LED diode and herewith sensitivity of the luminous intensity of the LED diode to temperature.
  • The circuit of the invention operates in the entire temperature range between -40° and 105°. Proper operation of the circuit of the invention is subject to adequate cooling by means of a cooler that can be arranged on the bottom side under the LED diode.

Claims (1)

  1. A circuit for a temperature control of a LED diode,
    characterized in that
    an analogue voltage signal is generated as a function of detected temperature on a sensor circuit (1), wherein this signal is compared to a ramp frequency, which is internally set on a regulator (3) by means of a resistor (2) and the signal of the regulator (3) generated based on the intersection point between the ramp frequency and the generated analogue voltage signal determines the current, the size of which depends on the width of the signal of the regulator (3) generated as a function of detected temperature on the sensor circuit (1).
EP10468002A 2009-06-03 2010-05-31 Circuit for a temperature control of a LED diode Withdrawn EP2312912A2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SI200900157A SI23077A (en) 2009-06-03 2009-06-03 Circuit for temperature control of a led diode

Publications (1)

Publication Number Publication Date
EP2312912A2 true EP2312912A2 (en) 2011-04-20

Family

ID=43415407

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10468002A Withdrawn EP2312912A2 (en) 2009-06-03 2010-05-31 Circuit for a temperature control of a LED diode

Country Status (2)

Country Link
EP (1) EP2312912A2 (en)
SI (1) SI23077A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011085659A1 (en) 2011-11-03 2013-05-08 Tridonic Gmbh & Co. Kg Clocked heating circuit for control gear for lamps
DE102015217146A1 (en) 2014-09-11 2016-03-17 Tridonic Gmbh & Co Kg Clocked flyback converter circuit
DE112020002722B4 (en) 2019-05-28 2023-03-02 Murata Manufacturing Co., Ltd. LED DRIVER CIRCUIT

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011085659A1 (en) 2011-11-03 2013-05-08 Tridonic Gmbh & Co. Kg Clocked heating circuit for control gear for lamps
DE102015217146A1 (en) 2014-09-11 2016-03-17 Tridonic Gmbh & Co Kg Clocked flyback converter circuit
DE112020002722B4 (en) 2019-05-28 2023-03-02 Murata Manufacturing Co., Ltd. LED DRIVER CIRCUIT
US11785686B2 (en) 2019-05-28 2023-10-10 Murata Manufacturing Co., Ltd. LED drive circuit

Also Published As

Publication number Publication date
SI23077A (en) 2010-12-31

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