EP3207767B1 - Circuit servant à faire fonctionner sans scintillements des diodes électroluminescentes ainsi que moyen d'éclairage et appareil d'éclairage - Google Patents

Circuit servant à faire fonctionner sans scintillements des diodes électroluminescentes ainsi que moyen d'éclairage et appareil d'éclairage Download PDF

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Publication number
EP3207767B1
EP3207767B1 EP15781860.0A EP15781860A EP3207767B1 EP 3207767 B1 EP3207767 B1 EP 3207767B1 EP 15781860 A EP15781860 A EP 15781860A EP 3207767 B1 EP3207767 B1 EP 3207767B1
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EP
European Patent Office
Prior art keywords
circuit
voltage
led
source
supply voltage
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EP15781860.0A
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German (de)
English (en)
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EP3207767A1 (fr
Inventor
Uwe Wiesner
Norbert Wittschief
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Atlas Elektronik GmbH
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Atlas Elektronik GmbH
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    • 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
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices

Definitions

  • the invention relates to a circuit for low-fl ash operation of light-emitting diodes, wherein the circuit n LED chains with a respective atomic number N, wherein the n is integer and greater than 1 and the N is integer and greater than 0, a total supply voltage terminal to which a time-dependent supply voltage, in particular rectified AC voltage, can be applied, and has an LED chain circuit and the LED chain circuit is set up such that the individual LED chains connected with increasing supply voltage with increasing atomic number N and switched off with decreasing supply voltage with decreasing atomic number, and a Bulbs and a light.
  • LED light emitting diode
  • the mains-side AC voltage is rectified in general and individual LED chains are controlled.
  • the LED chains are not connected over approx. 50 °. Only over the phase angle of about 130 °, at least one or more LED chains are connected, so that during this Time the switched LEDs emit a light signal. This means that for about 28% of the time the light emitting diodes do not emit light.
  • the object of the invention is to improve the prior art.
  • the object is achieved by a circuit for low-fl ash operation of light-emitting diodes, wherein the circuit n LED chains with a respective atomic number N, where the n is integer and greater than 1 and the N is integer and greater than 0, a total supply voltage terminal at which a time-dependent supply voltage , in particular rectified AC voltage, can be applied, and has an LED chain circuit and the LED chain circuit is set up such that the individual LED chains connected with increasing supply voltage with increasing atomic number N and switched off with decreasing supply voltage with decreasing atomic number, wherein the total supply voltage terminal is associated with a power storage source which is arranged such that at a supply start voltage, the power storage source is charged and at a supply application voltage at least one of the LED chains, in particular the entire LED chain with the O 1, and thus with most LEDs, the power storage source imposes a supply current, so that this LED chain is connected.
  • the circuit n LED chains with a respective atomic number N where the n is integer and greater than 1 and the N is integer and greater than
  • At least one LED chain or a part of an LED chain can be switched over the dark phases so that it emits a light signal through the individual LEDs during this time.
  • the vision is not linear but rather logarithmic
  • a viewer perceives the perhaps still resulting differences in brightness as extremely low and can not visually or at least barely perceive it with his or her eye.
  • the lighting that is implemented with the present circuit is perceived by people to be very pleasant and also makes it possible to work over a whole working day.
  • it can be at least ruled out that due to the lighting it comes to an excessive fatigue of the eyes.
  • the "circuit” is in particular an electronic circuit which is designed on a corresponding board with corresponding components. But also freely wired lines and components can implement the circuit.
  • a "low-flicker operation” is understood in particular to mean that complete darkness of all LEDs is excluded or reduced for a corresponding time.
  • the term low-flaring also includes the term flicker-free, although brightness differences may still be present, but essentially continuous lighting is provided.
  • Light-emitting diodes in the following also abbreviated to LED (light-emitting diode), are in particular semiconductor components to be understood, which emit light at an applied voltage or in a flowing current light, in particular in the optical spectrum of 400-800nm.
  • the "LED chains” generally comprise a plurality of light-emitting diodes. If previously LED chains are used with multiple LEDs, even single diodes, which are controlled accordingly, referred to as LED chain.
  • one of the LED strings can be formed by one or more Zener diodes (zener diodes).
  • the "n” indicates the number of LED strings. Usually between 2 and 10 LED chains and more preferably between 4 and 6 LED chains are used.
  • the ordinal number “N” numbers the individual chains. Thus, each individual LED chain with indication of the ordinal number N can be uniquely determined.
  • the “total supply voltage connection” is formed in particular by a connecting line, which both the single LED chain and the power storage source (direct or indirect) supplied.
  • a rectified AC voltage with 230V rms can be impressed in this total voltage supply connection.
  • time-dependent supply voltage is understood in particular to mean voltages in which the voltage value changes as a function of time or according to a phase angle. Due to the fact that it is rectified in particular in the case of an alternating voltage, a time-dependent direct voltage is then present in particular.
  • one or more LED strings can be connected in particular depending on the voltage applied to the overall supply terminal.
  • the LED chain wiring realizes the wiring of the individual LED chains by means of switchable current sources. These switchable current sources are in particular arranged such that an LED chain current and thus also an LED chain voltage (voltage drop across the LED chain or to the LED chains) during operation, the LED chain or the LED chains substantially constant remains. This increases the life of the individual LEDs.
  • the "current storage source” is a circuit or a circuit part which is charged in particular at a “supply start voltage” and which impresses a current of at least one of the LED chains as of a “supply application voltage”.
  • a power storage source includes both a charge storage and a charge dispenser, which are respectively activated or deactivated accordingly.
  • This power storage source is arranged in particular "in front" of the LED chains, so that - depending on the wiring of the LED chains - also several or all LEDs can be supplied by the power storage source.
  • the LED chain with the atomic number N more LEDs than the LED chain with the atomic number N + 1.
  • the LED chain with atomic number N 1 44 LEDs
  • the LED chain with atomic number N 2 24 LEDs
  • the LED chain with atomic number N 3 12 LEDs
  • the LED chain with atomic number N 4 8 LEDs respectively.
  • the total supply voltage connection can have a rectifier circuit, in particular a Graetz bridge circuit, which converts an AC voltage into a DC voltage.
  • a voltage which does not change its polarity is understood to mean, in particular, a DC voltage.
  • an alternating voltage is in particular a voltage at which the polarity changes. Both AC voltage and DC voltage have different voltage values, in particular at different times (phase angles).
  • the power storage source includes an input branch having an input diode and an input power source and an output branch having an output diode and an output power source.
  • the diodes are arranged oppositely, so that substantially either the input power source to a memory device impose a current or the output current source of one of the LED chains can impose a current.
  • Both the input power source and the output power source may have an ohmic resistance to which a voltage is applied so that a corresponding current flow results when the voltage is applied.
  • the input power source or the output power source or the input power source and the output power source may be a constant current (time and / or phase angle dependent) controllable power source.
  • Controllable in this context means in particular that the time at which the input current source or the output current source assumes its function as a current source is determined by the applied supply voltage and its phase angle.
  • a “constant current source” is to be understood in particular as meaning a component which, at least over a certain period of time, provides a substantially non-changing current.
  • the self-conducting N-channel FETs cause in this embodiment that the voltage at the associated resistor is constant, whereby the resistor essentially causes a constant current flow.
  • Controllable in this context is to be understood in particular as a time-dependent or correspondingly voltage-dependent / phase-dependent control and thus as a switching on and / or off of the constant current source.
  • the current storage source can have a capacitor which can serve both as a storage medium and as a source medium.
  • the capacitor In the event that the input current source causes a current flow, in particular the current storage source and thus the capacitor is charged as a storage medium. In the event that the output current source is to provide a current, the capacitor serves in particular as a source medium and emits charge carriers per time.
  • the power storage source has a modified valley-fill circuit.
  • the (same-sized) capacitors of the modified valley-fill circuit are connected in series. For example, so the capacitors are charged to 320V. As soon as the modified valley-fill circuit takes over the voltage supply of the output current source, the capacitors are connected in parallel. This has the consequence that the voltage is halved accordingly (for capacitors of equal size) and thus for the upper example, a voltage of 160V is applied. In the event that the first LED chain needed to operate 140V, only 20V and not 180V must be converted into heat by the circuit.
  • valley-fill circuits are used as passive power factor correction filters to filter unwanted harmonics in electrical power supplies. For this purpose, they have in particular a rectifier.
  • the present modified valley-fill circuit essentially corresponds to the usual valley-fill circuit without a rectifier.
  • the circuit For the circuit to emit light for illumination, the circuit has an applied voltage supply which impresses the time-dependent supply voltage of the circuit.
  • the object is achieved by a luminous means which has a previously described circuit.
  • the object is achieved by a luminaire, in particular street lighting system, indoor lighting system, parking garage lighting or lighting systems for corridors, hotels, aircraft and ships, which has a previously described light source or a corresponding circuit described above.
  • An LED circuit 101 in FIG. 1 includes a Graetz bridge circuit 103 at the output of a supply line 107 is arranged.
  • the supply line 107 conducts a voltage or sets a potential relative to the ground so that the LED chains 121, 123, 125, 127, 129 are operable.
  • a current storage source which is shown as an equivalent circuit diagram 111, is arranged on the supply line 107.
  • the supply voltage 105 is present as an AC voltage with 230V eff .
  • the current storage source 111 comprises two parallel branches which are connected to the supply line 107 on the one hand and to the other via the capacitor 119 are connected to ground. Each of the branches has a blocking diode 113. In the first branch, a first current source 115 and second branch, a second current source 117 is arranged. The two blocking diodes 113 are switched in opposite directions.
  • the first LED chain 121 is the switchable current source 131, the second LED chain 123, the switchable current source 133, the third LED chain 125, the switchable current source 137, the fourth LED chain 127, the switchable current source 139 and the Zener diode 129th the switchable current source 141 assigned.
  • the individual switchable current sources 131, 133, 137, 139, 141 are switched.
  • the individual switchable current sources 131, 133, 137, 139, 141 are switched depending on the phase angle.
  • This circuit is realized for example with a block CL8800 (Sequential Linear LED Driver) from Supertex® Inc.
  • the LED circuit 101 is explained without the function of the power storage source in its operation. This operation corresponds to the operation of the LEDs according to the prior art.
  • the AC line voltage is applied in the amount of 230V eff .
  • a DC voltage is formed at the output of the Graetz bridge rectifier 103 and thus on the supply line 107.
  • the first (partly sinusoidal) half wave of this DC voltage is in FIG. 2 shown in a diagram and labeled as supply voltage curve 203.
  • all switchable current sources 131, 133, 137, 139, 141 are connected to ground.
  • the switchable current source 131, then the switchable current source 133, then the switchable current source 137 and finally the switchable current source 139 is turned off, so that only the switchable current source 141 is connected to ground by the phase angle of 90 °.
  • the individual switchable current sources 131, 133, 137, 139 connected in the reverse order to ground.
  • the LED chains 121, 123, 125, 127, 129 are successively switched off and on.
  • the switchable current source 131 is interrupted and the switchable current source 133 is switched through as the only switchable current source, so that a sufficient voltage is applied both to the first LED chain 121 and to the second LED chain 123 and therefore additionally the second LED chain 123 is illuminated.
  • the switchable current source 133 generates a current such that the voltage across the first LED string 121 and the second LED string 123 is constant. This is continued accordingly with further increasing supply voltage for the further LED chains, so that in each case only one of the switchable current sources 131, 133, 135, 137, 139, 141 is connected to ground in succession and the corresponding LED chains are connected.
  • the switchable current source 141 is interrupted and the fourth switchable current source 139 is switched through and then interrupted again with a further dropping voltage and the third switchable current source 137 is switched through. This takes place until the switchable current source 131 is turned on again at the end.
  • the currents flowing through the LED are also in the diagram of FIG. 2 represented and designated by the reference numeral 205.
  • the step shape of the current profile 205 is achieved in particular by the design of the switchable current sources 131, 133, 135, 137, 139, 141.
  • the first current source 115 associated blocking diode With increasing voltage on the supply line 107, the first current source 115 associated blocking diode is operated in the forward direction.
  • the applied voltage at the first current source 115 causes a current to flow, which charges the capacitor 119.
  • the voltage applied to the capacitor 119 has a higher value than the DC voltage at the supply line 107 (this is the case in particular when the voltage drops again) blocks the diode associated with the first current source 115, so that the first current source 115 is quasi off ,
  • the blocking diode connected to the second current source 117 is now switched in the forward direction, so that the voltage applied to the capacitor 119 at the second current source 117 generates a current (209) which is passed through the diode associated with the second current source 117.
  • This current (209) is impressed, in particular, on the first LED chain 121 and conducted to ground via the switchable current source 131, which is then closed in this case.
  • the light-emitting diodes of the first LED chain 121 are illuminated, although the voltage actually applied to the supply line 107 may not be sufficient for the operation of the first LED chain (see voltage curve 203).
  • the first current source 115 and / or the second current source 117 are formed as an ohmic resistor 301.
  • any other ohmic resistance or each component, which forms an ohmic resistance, such as a bipolar transistor, can take over this function in the present case.
  • the first current source 115 and second current source 117 may be configured as constant current sources.
  • the first current source 115 and the second current source 117 comprise a self-conducting N-channel FET. These FETs conduct in the unconnected state between drain and source. By arranged after the resistance feedback to the gate, a constant voltage can be generated at the associated resistor over a wide voltage range, this in turn leads to a constant current flow. This current flow is firstly used to charge the capacitor 119, or the capacitor supplies the second current source 117 with its voltage.
  • the capacitors 305 connected in parallel with the respective resistor serve, in particular, to suppress or avoid oscillating oscillation due to the feedback.
  • the first current source 115 and the second current source 117 are formed as quasi-constant current sources.
  • a modified valley-fill circuit 311 is assigned to the first current source 115 and the second current source 117.
  • the first current source 115 and the second current source 117 may be configured as described above.
  • the first current source 115 charges the first capacitor 313 and the first capacitor 313 Capacitor 315.
  • the capacitors 313, 315 are connected in series.
  • the first current source 115 is switched off and the second current source 117 is supplied via the capacitors 313, 315, which are now connected in parallel, so that, in turn, it imposes a current on the LED chains.

Landscapes

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

Claims (10)

  1. Circuit (101) destiné à faire fonctionner avec un faible scintillement des diodes électroluminescentes, le circuit possédant n chaînes de LED (121, 123, 125, 127, 129) ayant chacune un numéro d'ordre N correspondant, n étant un nombre entier et supérieur à 1 et N étant un nombre entier et supérieur à 0, une borne de tension d'alimentation générale (107) à laquelle peut être appliquée une tension d'alimentation (105) dépendante du temps, notamment une tension alternative redressée, et un câblage de chaînes de LED, et le câblage de chaînes de LED étant conçu de telle sorte que les chaînes de LED individuelles ayant une tension d'alimentation croissante sont mises en circuit avec un numéro d'ordre N croissant et ayant une tension d'alimentation décroissante sont mises hors circuit avec un numéro d'ordre N décroissant, caractérisé en ce qu'une source d'alimentation en courant (111) est associée à la borne de tension d'alimentation générale, laquelle est conçue de telle sorte qu'en présence d'une tension de début d'alimentation, la source d'alimentation en courant (111) est chargée et en présence d'une tension de service d'alimentation de l'une des chaînes de LED (121, 123, 125, 127, 129), la source d'alimentation en courant (111) applique un courant d'alimentation à au moins l'une des chaînes de LED, de sorte que cette chaîne de LED est mise en circuit.
  2. Circuit (101) selon la revendication 1, caractérisé en ce que la chaîne de LED ayant le numéro d'ordre N possède plus de diodes électroluminescentes que la chaîne de LED ayant le numéro d'ordre N+1.
  3. Circuit (101) selon l'une des revendications précédentes, caractérisé en ce que la borne de tension d'alimentation générale (107) possède un circuit redresseur (103), notamment un circuit en pont de Graetz, qui convertir une tension alternative en une tension continue.
  4. Circuit (101) selon l'une des revendications précédentes, caractérisé en ce que la source d'alimentation en courant (111) possède une branche d'entrée comprenant une diode d'entrée et une source de courant d'entrée (115) et une branche de sortie comprenant une diode de sortie et une source de courant de sortie (117).
  5. Circuit (101) selon la revendication 4, caractérisé en ce que la source de courant d'entrée (115) et/ou la source de courant de sortie (117) est ou sont une source de courant constant commandable.
  6. Circuit (101) selon l'une des revendications précédentes, caractérisé en ce que la source d'alimentation en courant (111) possède un condensateur (119) qui sert de support d'accumulation et de support de source.
  7. Circuit (101) selon l'une des revendications précédentes, caractérisé en ce que la source d'alimentation en courant (111) possède un circuit de remplissage de vallée sans redresseur.
  8. Circuit (101) selon l'une des revendications précédentes, caractérisé par une alimentation électrique (105) appliquée qui applique au circuit (101) la tension d'alimentation dépendante du temps.
  9. Source lumineuse qui possède un circuit (101) selon l'une des revendications précédentes.
  10. Lampe, notamment équipement d'éclairage public, équipement d'éclairage intérieur, équipement d'éclairage de parking ou équipements d'éclairage pour couloirs, hôtels, aéronefs et navires, qui possèdent une source lumineuse selon la revendication 9.
EP15781860.0A 2014-10-14 2015-08-28 Circuit servant à faire fonctionner sans scintillements des diodes électroluminescentes ainsi que moyen d'éclairage et appareil d'éclairage Active EP3207767B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014114853.3A DE102014114853A1 (de) 2014-10-14 2014-10-14 Schaltung zum flackerarmen Betreiben von Leuchtdioden, sowie Leuchtmittel und Leuchte
PCT/DE2015/100358 WO2016058585A1 (fr) 2014-10-14 2015-08-28 Circuit servant à faire fonctionner sans scintillements des diodes électroluminescentes ainsi que moyen d'éclairage et appareil d'éclairage

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Publication Number Publication Date
EP3207767A1 EP3207767A1 (fr) 2017-08-23
EP3207767B1 true EP3207767B1 (fr) 2019-03-06

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EP15781860.0A Active EP3207767B1 (fr) 2014-10-14 2015-08-28 Circuit servant à faire fonctionner sans scintillements des diodes électroluminescentes ainsi que moyen d'éclairage et appareil d'éclairage

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EP (1) EP3207767B1 (fr)
DE (1) DE102014114853A1 (fr)
WO (1) WO2016058585A1 (fr)

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CN109979132A (zh) * 2017-12-27 2019-07-05 航天信息股份有限公司 一种单报警灯表示多设备报警状态的方法及***

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DE102006035075A1 (de) * 2006-07-28 2008-01-31 Infineon Technologies Ag Schaltungsanordnung mit einer Umschaltvorrichtung und Verfahren zum Betreiben einer Schaltungsanordnung
US8569956B2 (en) * 2009-06-04 2013-10-29 Point Somee Limited Liability Company Apparatus, method and system for providing AC line power to lighting devices
DE102011003931A1 (de) * 2011-02-10 2012-08-16 Osram Ag Ansteuerung mehrerer in Reihe geschalteter Leuchtmittel
EP2683220A1 (fr) * 2012-07-04 2014-01-08 Zentrum Mikroelektronik Dresden AG Dispositif et procédé destinés à la commande de diodes lumineuses dépendant de l'amplitude de la tension alimentaire, en utilisant commutateurs de dérivation
US9131571B2 (en) * 2012-09-14 2015-09-08 Cree, Inc. Solid-state lighting apparatus and methods using energy storage with segment control
KR102132665B1 (ko) * 2013-03-21 2020-07-21 서울반도체 주식회사 이중 브리지 다이오드를 이용한 led 구동회로, 이를 포함하는 led 조명장치

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WO2016058585A1 (fr) 2016-04-21
DE102014114853A1 (de) 2016-04-14
EP3207767A1 (fr) 2017-08-23

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