EP1330143A2 - Dispositif de contrôle pour les diodes électroluminescentes - Google Patents

Dispositif de contrôle pour les diodes électroluminescentes Download PDF

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Publication number
EP1330143A2
EP1330143A2 EP03000960A EP03000960A EP1330143A2 EP 1330143 A2 EP1330143 A2 EP 1330143A2 EP 03000960 A EP03000960 A EP 03000960A EP 03000960 A EP03000960 A EP 03000960A EP 1330143 A2 EP1330143 A2 EP 1330143A2
Authority
EP
European Patent Office
Prior art keywords
electronic switch
leds
emitting diodes
circuit arrangement
pull
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
Application number
EP03000960A
Other languages
German (de)
English (en)
Other versions
EP1330143B1 (fr
EP1330143A3 (fr
Inventor
Ugo Francescutti
Giovanni Scilla
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1330143A2 publication Critical patent/EP1330143A2/fr
Publication of EP1330143A3 publication Critical patent/EP1330143A3/fr
Application granted granted Critical
Publication of EP1330143B1 publication Critical patent/EP1330143B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]

Definitions

  • the invention relates to a circuit arrangement according to the preamble of Claim 1. It is in particular an electronic control gear a device for setting the effective value for the operation of light-emitting diodes contains the operating current of the LEDs, this device pulsed mode of operation.
  • the following circuit arrangement is for operating light-emitting diodes, further abbreviated as LED common: an energy source, e.g. a public supply network or a battery that feeds an electronic converter that has a supply voltage provides.
  • the LEDs are usually connected to two connecting cables connected to the supply voltage. There can be one or more LEDs on one Supply voltage can be operated. Several LEDs are usually in series switched and form a so-called strand. Several lines can be connected in parallel cross connections are also possible between the strands. Become most LEDs are connected to one supply voltage, so they are combined into so-called LED modules that also include current limiting resistors can contain. Together with voltage regulation in the electronic converter a desired operating current for connected LEDs is realized.
  • the circuit arrangements in question are not only for the operation of LEDs suitable. It is also possible to use organic light emitting devices (OLED). to operate.
  • OLED organic light emitting devices
  • the electronic switch and an associated control circuit can be put together combined with the electronic converter into one unit in one housing his. But it is also possible to use the electronic switch and the control circuit to be designed as a separate dimming unit in a separate housing. This dimming unit can then be used for setting the effective value of the operating current of the LEDs is desired between the electronic converters and the LEDs are switched.
  • the pulse rate at which the electronic switch is opened and closed is usually above a frequency at which the human eye is isolated It is able to distinguish between light pulses. In practice, frequencies come from 100Hz to several kilohertz for use.
  • the connecting line into which no electronic switch is inserted forms a pole of an output voltage.
  • the other pole of the output voltage is the one facing away from the supply voltage Pole of the electronic switch.
  • the output voltage is the LEDs or LED modules supplied. It has a rectangular shape Fundamental frequency equal to the above Pulse rate is. Especially with long connection lines this can lead to electromagnetic incompatibility or radio interference to lead. To prevent this and to comply with relevant regulations (e.g. CISPR 15) adhering to them often requires a lot of effort in the form of filters and shields.
  • the output voltage is made up of a DC component and an AC component together.
  • the amplitude of the alternating component the output voltage is briefly below with the amplitude of the output voltage designated.
  • the maximum value of the output voltage is set when the is closed electronic switch and is by the value of the supply voltage specified. By definition, the amplitude of the output voltage is half the difference between the maximum value and minimum value of the output voltage. Given The maximum value thus determines the minimum value the amplitude of the output voltage and thus the strength of the electromagnetic interference. The smaller the The minimum value of the output voltage is, the stronger the electromagnetic Disorders.
  • the minimum value of the output voltage is essentially determined by two variables: a load impedance when the electronic is switched off Switch and an off-impedance of the electronic switch.
  • the load impedance at switched off electronic switch is composed of the impedance of the Connection cables and the impedance of the LEDs with a very low operating current.
  • Below the off-impedance of the electronic switch is the impedance of the electronic one Understand switch in the open state.
  • Lead impedances to electronic switches can be considered in the off-impedance, play but generally doesn't matter. Both sizes, the load impedance when switched off electronic switches and the off-impedance are subject to strong variations conditionally e.g.
  • the value of the minimum value is not exactly determined.
  • the amount of off-impedance is orders of magnitude the amount of load impedance surpasses. It can also be assumed that the real part of the concerned Impedances essentially determine the properties of these impedances. Approximately the output voltage thus drops when the electronic switch is open to the value 0. It follows that the amplitude of the Output voltage is substantially equal to half the supply voltage.
  • a pulldown device is used in parallel with the electronic switch connected.
  • the value of the pulldown device's resistance should be be selected so that in the parallel connection of pulldown device and off-impedance The off-impedance can be neglected, so variations in the off-impedance have no influence on the output voltage.
  • Pulldown device can set the minimum value of the output voltage become. According to the invention, the minimum value will deviate significantly from 0 and thus be significantly larger than in the prior art. This is compared to the Prior art reduced the amplitude of the output voltage, resulting in an inventive Reduction of electromagnetic interference leads.
  • the value of the resistance of the pulldown device must not be so be small that it is on the order of the resistance of the electronic switch is in the closed state. In this case the effect would be electronic Switch and thus the effect of the pulsed operation limited.
  • the electronic switch is opened, the operating current of the LEDs is reduced.
  • a reduction factor becomes the operating current when the electronic switch is open described.
  • a limitation of the pulsed operation is then according to the invention not given if the value of the lowering factor is at least 10.
  • the lowering factor is greater than 1000 so there is no effective reduction of the invention given electromagnetic incompatibilities.
  • the cheapest implementation of the pulldown device according to the invention is a Pull-down resistor.
  • an adjustable Pulldown resistor can be realized.
  • This can take the form of one or more Semiconductors, e.g. FETs happen that operate as voltage controlled resistors become. Also a resistance that cannot be changed continuously, e.g. B. in the form of a switchable resistor cascade is conceivable.
  • the adjustable pulldown resistor is controlled by a control device. This records a current lowering factor and sets the adjustable pulldown resistance so that a given one Lowering factor is observed.
  • the Control device To record the current reduction factor, the Control device the operating current of the LED or the current through the electronic Switch and the adjustable pulldown resistor fed. Because the lowering factor is defined by the operating current, the sole detection of the Operating current to determine the reduction factor. Because the operating current is essentially the sum of the current through the electronic switch and the current due to the adjustable pulldown resistor, it is sufficient for these two currents to determine the lowering factor. Approximately, when closed electronic switch the current through the electronic switch be set equal to the operating current. A statement about the lowering factor the amplitude of the output voltage can also be evaluated. In the event that the supply voltage is constant, the voltage is sufficient evaluate over the electronic switch.
  • the pull-up device is inexpensive due to a pull-up resistor realized.
  • the value of the pullup resistor must be between the values lie, which are for the amount of load impedance when open and when closed result in electronic switch.
  • the electronic switch When the electronic switch is closed the operating current through the LEDs is high and thus the load impedance is low.
  • the value of the pull-up resistance is chosen to be greater than this low load impedance, thus the electronic converter essentially supplies energy to the LEDs delivers and not to the pullup resistor.
  • the electronic switch open With the electronic switch open the operating current through the LEDs is low and therefore due to the non-linear ones Properties of the LEDs, the load impedance high.
  • the value of the pullup resistance must be lower than this high load impedance, so that according to the invention the variations in high load impedance do not affect the amplitude of the Affect output voltage.
  • Both pullup and pulldown resistance do not necessarily have to be through one individual resistance can be realized.
  • the realization is also possible by connecting several resistors in parallel or in series. Parallel to the resistors z. B. to reduce the slope of the output voltage reactances must also be switched.
  • resistances are indicated by the letter R, switches by the Letter S, tensions through the letter V, and connection points through the letter J followed by a number.
  • FIG. 1 is a block diagram of a circuit arrangement according to the invention shown for the operation of LEDs.
  • An electronic converter 1 delivers to J1, J2 a supply voltage V1 to a dimming module 2.
  • Das Dimming module 2 supplies an output voltage V2 at the connection points J3, J4 to the LEDs 3.
  • a piece of a first connection line from the electronic converter 1 to the LEDs 3 is made by a connection from the connection point J1 to Junction J2 formed in the dimming module 2.
  • a piece of a second connection line from the electronic converter 1 to the LEDs 3 leads from the connection point J2 2 via an electronic switch S 1 in the dimming module to the connection point J4.
  • a control circuit 4 controls the electronic switch S1 in such a way that that the LEDs 3 are operated in a pulsed mode of operation.
  • a pulldown resistor R2 is connected in parallel with the electronic switch S1.
  • the function and sizing rules for R2 are shown in the section the invention. This applies equally to an invention Pullup resistor, which is connected between J3 and J4 in dimming module 2.
  • FIG. 2 shows the course of the output voltage V2 over the time t of a circuit arrangement for operating LEDs according to the prior art (without R1 and R2).
  • the course is essentially rectangular.
  • the maximum value of V2 is always assumed when the electronic switch S1 is closed, the minimum value of V2 is always assumed when S1 is open.
  • the maximum value of V2 essentially corresponds to the supply voltage V1 that the electronic converter 1 supplies.
  • the minimum value of V2 is approximately 0. This essentially results in the value for the amplitude of V2 according to the prior art V 1 2
  • FIG. 3 shows the course of the output voltage V2 over the time t of a circuit arrangement according to the invention for operating LEDs (with R1 and R2).
  • the course is essentially rectangular.
  • the maximum value of V2 is always assumed when the electronic switch S1 is closed, the minimum value of V2 is always assumed when S1 is open.
  • the maximum value of V2 essentially corresponds to the supply voltage V1 that the electronic converter 1 supplies.
  • FIG. 4 is a block diagram of a circuit arrangement according to the invention shown for the operation of LEDs with adjustable regulated pulldown resistor.
  • the pulldown resistor R2 is adjustable in FIG Resistance executed, which is controlled by a control device 5.
  • the control device 5 sets the pulldown resistor R2 so that one in the control device stored specified reduction value is observed.
  • the control device 5 receives a measured value for the operating current of the LEDs supplied.
  • the amplitude of the alternating component of the operating current of the LEDs is a measure of the current reduction value.
  • the current reduction value can thus be in the Control device 5 can be determined.

Landscapes

  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Electronic Switches (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Led Device Packages (AREA)
EP03000960A 2002-01-17 2003-01-16 Dispositif de contrôle pour les diodes électroluminescentes Expired - Lifetime EP1330143B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10201779 2002-01-17
DE10201779A DE10201779A1 (de) 2002-01-17 2002-01-17 Betriebsgerät für Leuchtdioden

Publications (3)

Publication Number Publication Date
EP1330143A2 true EP1330143A2 (fr) 2003-07-23
EP1330143A3 EP1330143A3 (fr) 2004-02-11
EP1330143B1 EP1330143B1 (fr) 2006-11-22

Family

ID=7712466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03000960A Expired - Lifetime EP1330143B1 (fr) 2002-01-17 2003-01-16 Dispositif de contrôle pour les diodes électroluminescentes

Country Status (4)

Country Link
EP (1) EP1330143B1 (fr)
CN (1) CN100474995C (fr)
AT (1) ATE346480T1 (fr)
DE (2) DE10201779A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115541971A (zh) * 2022-11-23 2022-12-30 南京宏泰半导体科技有限公司 一种半导体测试机发送的通讯ttl电平检测系统及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102545650B (zh) * 2010-12-31 2016-12-28 澳大利亚克林普斯有限公司 电源转换电路

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS633477A (ja) * 1986-06-23 1988-01-08 Sharp Corp 発光ダイオ−ドの調光回路
WO1999030537A1 (fr) * 1997-12-11 1999-06-17 Proquip Special Projects Limited Lampes comprenant des diodes electroluminescentes
EP1049360A2 (fr) * 1999-04-30 2000-11-02 Agilent Technologies Inc., A Delaware Corporation Circuit d' attaque programmable pour diodes électroluminescentes
WO2001095673A1 (fr) * 2000-06-06 2001-12-13 911 Emergency Products, Inc. Circuit de compensation pour del

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS633477A (ja) * 1986-06-23 1988-01-08 Sharp Corp 発光ダイオ−ドの調光回路
WO1999030537A1 (fr) * 1997-12-11 1999-06-17 Proquip Special Projects Limited Lampes comprenant des diodes electroluminescentes
EP1049360A2 (fr) * 1999-04-30 2000-11-02 Agilent Technologies Inc., A Delaware Corporation Circuit d' attaque programmable pour diodes électroluminescentes
WO2001095673A1 (fr) * 2000-06-06 2001-12-13 911 Emergency Products, Inc. Circuit de compensation pour del

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 204 (E-620), 11. Juni 1988 (1988-06-11) & JP 63 003477 A (SHARP CORP), 8. Januar 1988 (1988-01-08) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115541971A (zh) * 2022-11-23 2022-12-30 南京宏泰半导体科技有限公司 一种半导体测试机发送的通讯ttl电平检测系统及方法

Also Published As

Publication number Publication date
DE50305720D1 (de) 2007-01-04
DE10201779A1 (de) 2003-07-31
CN1441631A (zh) 2003-09-10
EP1330143B1 (fr) 2006-11-22
EP1330143A3 (fr) 2004-02-11
ATE346480T1 (de) 2006-12-15
CN100474995C (zh) 2009-04-01

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