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WO2011071694A1 - Surveillance de tension pour contrôler la température dans des modules d'éclairage à semi-conducteur - Google Patents

Surveillance de tension pour contrôler la température dans des modules d'éclairage à semi-conducteur Download PDF

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Publication number
WO2011071694A1
WO2011071694A1 PCT/US2010/057880 US2010057880W WO2011071694A1 WO 2011071694 A1 WO2011071694 A1 WO 2011071694A1 US 2010057880 W US2010057880 W US 2010057880W WO 2011071694 A1 WO2011071694 A1 WO 2011071694A1
Authority
WO
WIPO (PCT)
Prior art keywords
lighting module
voltage
monitoring
microcontroller
temperature
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.)
Ceased
Application number
PCT/US2010/057880
Other languages
English (en)
Inventor
Jonathan L. Marson
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.)
Phoseon Technology Inc
Original Assignee
Phoseon Technology Inc
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 Phoseon Technology Inc filed Critical Phoseon Technology Inc
Priority to JP2012543141A priority Critical patent/JP2013513943A/ja
Priority to DE212010000213U priority patent/DE212010000213U1/de
Publication of WO2011071694A1 publication Critical patent/WO2011071694A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs

Definitions

  • UV curing has many applications in printing, coating and
  • UV-sensitive materials generally rely upon a particular amount of energy in the form of U V light to initiate and sustain the curing process (polymerization) within the materials.
  • UV light fixtures commonly known as UV lamps, provide the UV light to the materials for curing.
  • LEDs light emitting diodes
  • UV curing has several advantages over using arc lamps, including lower power consumption, lower cost, cooler operating temperatures, etc.
  • the arrays consist of individual LED elements arranged in an X-Y grid on a substrate.
  • thermal switch of some kind may be mounted on the package of a solid state lighting module. When the operating temperature of the module reaches a certain level, the thermal switch shuts it down to avoid lighting degradation and wear and tear on the module. The thermal switch generally does not react very quickly, so significant degradation in the illumination and wear on the module still occurs prior to the module being shut off.
  • Figure 1 shows an embodiment of a lighting system.
  • Figure 2 shows a graph of lighting module junction temperature and voltage over time.
  • Figure 3 shows a graph of lighting module junction temperature over time??? [Jon, you were going to get me a different graph.]
  • Figure 4 shows a schematic diagram of an embodiment of a voltage monitoring circuit.
  • Figure 1 shows an illumination system 10 including a lighting module 12, a controller 18 electrically connected to the lighting module and a voltage sensor 6 V" 22 electrically connected to the lighting module and the controller.
  • the lighting module may have a cooling channel such as 14 that provides some sort of cooling mechanism to the lighting module. These mechanisms may include air cooling, fluid cooling such as water, a heat sink, etc.
  • the lighting module may also have a thermal switch 16 that operates to shut off the lighting module when the temperature gets too high.
  • the response time for the thermal switch may be too long or too slow to provide good protection of the lighting module from overheating and the degradation of illumination and wear as a result of that overheating.
  • the controller of the system may be any type of programmable device, such as a microcontroller, digital signal processor, general purpose processor, field programmable gate array, application specific integrated circuit, firmware operating in any one of these, etc. as examples.
  • the controller operates the lighting module including control of the power supply, monitors the voltages at the voltage sensor 22, and stores information in the memory 25.
  • the memory may be any type of memory, including dynamic random access memory (DRAM), static random access memory (SRAM), non-volatile memory, and may be organized into look up tables or as a database.
  • a voltage monitor or sensor 22 monitors the voltage provided to the lighting module or sensing the voltage and reports it back to the controller 18. Experiments have shown that the voltage provided to the lighting module at a constant current varies in relation to the temperature of the lighting module. An output graph of one such experiment is shown in Figure 2.
  • a field-effect transistor FET was employed as a voltage sensor, and the voltage of the FET was monitored.
  • the voltages provided to the lighting module and at the junction of the FET were monitored by meters and recorded as the actual voltages.
  • the voltages as reported by the firmware were also recorded as the reported voltages.
  • the water flow being used to cool the lighting module was adjusted and the actual and reported voltages were recorded at the new temperature of the lighting module.
  • the temperature of interest is the temperature of the lighting module, which may be referred to as the lighting module junction temperature. This is not to be confused with the junction voltage of the FET.
  • the lighting module shows a clear response in voltage corresponding to changes in the junction temperature.
  • the firmware reported a change in voltage from 4 to 4.9 volts as the junction temperature changed from 37 to 95 degrees Celsius.
  • the results are shown in Figure 2.
  • the junction temperature is on the left axis, the voltage is on the right axis and the bottom axis is time.
  • the darker curve is the lighting module junction temperature and the lighter curve is voltage. This relationship may be better expressed by an equation:
  • the variable 'm' is a constant that is reached during checkout of the lighting module, and Tj is the temperature at checkout.
  • T 2 (V n - V f ,)/m + T,.
  • This relationship uses the voltage of the sensor to determine the temperature of the lighting module during operation.
  • Figure 3 shows a graph of sensor voltage, in this case an FET, against an intensity control setting, in this case a global potentiometer. This data would be gathered and stored, referenced by the intensity control setting, for later access by the controller during operation.
  • FIG. 3 An embodiment of a monitoring circuit is shown in Figure 3.
  • the power supply 20 provides power to the lighting module 12.
  • the lighting module 12 may consist of at least one array of lighting elements arranged in an X-Y grid.
  • the lighting module shown in Figure 3 has several arrays set in one fixture to act as one lighting source.
  • Each array 12 A, 12B, 12C, etc. may have their own intensity control.
  • the lighting module will have an intensity control 24 that controls the power to all of the arrays in the lighting module and is referred to here as the global intensity control.
  • the global intensity control may be the intensity control for that one array.
  • the intensity control took the form of a global potentiometer that regulates the power to the arrays, thereby regulating the resulting intensity of the light emitted by the elements.
  • Other options are of course possible and no limitation to any particular form of intensity control is intended nor should any be implied.
  • the look up table or database may be organized around the intensity control settings, as that will affect the voltages used in the system.
  • the controller 18 monitors the voltage at the voltage sensor 22, in this embodiment an FET.
  • the controller may access a look up table or other data structure to determine the corresponding temperature to the detected voltage. When or if the detected voltage reaches a level corresponding to a temperature level that is too high, the controller would shut down the lighting module. This prevents both degradation of illumination coming from the lighting module and also wear and tear on the lighting module and the elements.
  • implementation of the embodiments of the invention results in a voltage sensor or detector being used to allow the controller to monitor the voltage being provided to a lighting module.
  • a relationship between the voltage and the junction temperature of the lighting module is determined and data corresponding to this relationship is stored.
  • the controller can then monitor the voltage level and determine whether or not it has exceeded a particular level, indicating that the lighting module has overheated and needs to be shut down. This signal is stronger and has a faster response time than the heat monitoring done by most thermal switches.

Landscapes

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

Abstract

La présente invention concerne un système d'éclairage qui comporte un module d'éclairage, un microcontrôleur connecté électriquement au module d'éclairage et agencé pour commander le module d'éclairage, et un transistor, connecté électriquement au module d'éclairage et au microcontrôleur, agencé pour permettre au microcontrôleur de surveiller une tension du transistor ou du module d'éclairage. Un procédé de commande d'un module d'éclairage consiste à allumer le module d'éclairage, à fournir un courant au module d'éclairage, le courant étant déterminé par un réglage d'intensité global pour le module d'éclairage, à surveiller une tension fournie au module d'éclairage, et à éteindre le module d'éclairage si la tension atteint un niveau prédéterminé.
PCT/US2010/057880 2009-12-10 2010-11-23 Surveillance de tension pour contrôler la température dans des modules d'éclairage à semi-conducteur Ceased WO2011071694A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2012543141A JP2013513943A (ja) 2009-12-10 2010-11-23 発光素子の制御回路
DE212010000213U DE212010000213U1 (de) 2009-12-10 2010-11-23 Überwachen von elektrischer Spannung zum Verfolgen von Temperatur in Festkörperleuchtmodulen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/635,646 2009-12-10
US12/635,646 US8330377B2 (en) 2009-12-10 2009-12-10 Monitoring voltage to track temperature in solid state light modules

Publications (1)

Publication Number Publication Date
WO2011071694A1 true WO2011071694A1 (fr) 2011-06-16

Family

ID=44142160

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2010/057880 Ceased WO2011071694A1 (fr) 2009-12-10 2010-11-23 Surveillance de tension pour contrôler la température dans des modules d'éclairage à semi-conducteur

Country Status (4)

Country Link
US (1) US8330377B2 (fr)
JP (1) JP2013513943A (fr)
DE (1) DE212010000213U1 (fr)
WO (1) WO2011071694A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8378322B2 (en) * 2010-01-27 2013-02-19 Fusion Uv Systems Micro-channel-cooled high heat load light emitting device
US8836231B2 (en) * 2011-08-26 2014-09-16 Cree, Inc. Modularized LED lamp
US9126432B2 (en) * 2011-09-20 2015-09-08 Phoseon Technology, Inc. Differential Ultraviolet curing using external optical elements
US10895649B2 (en) 2018-09-20 2021-01-19 Phoseon Technology, Inc. Methods and system for thermo-optic power monitoring

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784844A (en) * 1972-12-27 1974-01-08 Rca Corp Constant current circuit
US20050230600A1 (en) * 2004-03-30 2005-10-20 Olson Steven J LED array having array-based LED detectors
US20060012349A1 (en) * 2002-06-27 2006-01-19 Mark Allen FET current regulation of LEDs
US20070040512A1 (en) * 2005-08-17 2007-02-22 Tir Systems Ltd. Digitally controlled luminaire system

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5936353A (en) 1996-04-03 1999-08-10 Pressco Technology Inc. High-density solid-state lighting array for machine vision applications
CA2332190A1 (fr) 2001-01-25 2002-07-25 Efos Inc. Source lumineuse a reseau de semiconducteurs adressable permettant l'irradiation localisee
GB0304761D0 (en) 2003-03-01 2003-04-02 Integration Technology Ltd Ultraviolet curing
US7239773B2 (en) * 2004-06-28 2007-07-03 Fujitsu Limited Optical-switch testing apparatus, optical-signal switching apparatus, optical-switch testing method, and control method for optical-signal switching
WO2006019897A2 (fr) * 2004-08-04 2006-02-23 Ng James K Systeme d'eclairage par del
US20060220571A1 (en) * 2005-03-31 2006-10-05 Super Vision International, Inc. Light emitting diode current control method and system
US7290903B2 (en) * 2005-10-26 2007-11-06 Chunghwa Picture Tubes, Ltd. Projection display
US7710050B2 (en) * 2005-11-17 2010-05-04 Magna International Inc Series connected power supply for semiconductor-based vehicle lighting systems
US7902771B2 (en) * 2006-11-21 2011-03-08 Exclara, Inc. Time division modulation with average current regulation for independent control of arrays of light emitting diodes
JP2009016384A (ja) * 2007-06-29 2009-01-22 Sony Corp 照明装置の制御方法、及び、液晶表示装置組立体の駆動方法
JP5050715B2 (ja) * 2007-08-01 2012-10-17 株式会社デンソー 発光ダイオード駆動回路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784844A (en) * 1972-12-27 1974-01-08 Rca Corp Constant current circuit
US20060012349A1 (en) * 2002-06-27 2006-01-19 Mark Allen FET current regulation of LEDs
US20050230600A1 (en) * 2004-03-30 2005-10-20 Olson Steven J LED array having array-based LED detectors
US20070040512A1 (en) * 2005-08-17 2007-02-22 Tir Systems Ltd. Digitally controlled luminaire system

Also Published As

Publication number Publication date
DE212010000213U1 (de) 2013-02-13
JP2013513943A (ja) 2013-04-22
US8330377B2 (en) 2012-12-11
US20110140608A1 (en) 2011-06-16

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