EP2425679A1 - Circuit d'excitation pour une led - Google Patents

Circuit d'excitation pour une led

Info

Publication number
EP2425679A1
EP2425679A1 EP10721271A EP10721271A EP2425679A1 EP 2425679 A1 EP2425679 A1 EP 2425679A1 EP 10721271 A EP10721271 A EP 10721271A EP 10721271 A EP10721271 A EP 10721271A EP 2425679 A1 EP2425679 A1 EP 2425679A1
Authority
EP
European Patent Office
Prior art keywords
led
transformer
driver circuit
capacitor
circuit
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
EP10721271A
Other languages
German (de)
English (en)
Other versions
EP2425679B1 (fr
Inventor
Alexander Barth
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.)
Tridonic GmbH and Co KG
Original Assignee
Tridonic GmbH and Co KG
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 Tridonic GmbH and Co KG filed Critical Tridonic GmbH and Co KG
Publication of EP2425679A1 publication Critical patent/EP2425679A1/fr
Application granted granted Critical
Publication of EP2425679B1 publication Critical patent/EP2425679B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • 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]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
    • 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]
    • H05B45/39—Circuits containing inverter bridges

Definitions

  • the invention relates to a driver circuit for an LED according to the preamble of patent claim 1.
  • Such driver circuits are used in lighting systems to achieve a colored or flat lighting of rooms, paths or escape routes.
  • the bulbs are driven by operating devices and activated as needed.
  • organic or inorganic light emitting diodes LED are used as the light source.
  • light-emitting diodes are also increasingly being used as the light source.
  • the efficiency and luminous efficacy of light-emitting diodes is being increased more and more so that they are already being used in various general lighting applications.
  • light emitting diodes are point sources of light and emit highly concentrated light.
  • phase control dimming or phase section dimming classic bulbs such as incandescent lamps can be dimmed, so controlled in the brightness.
  • the solution according to the invention for a device for operating LEDs is based on the idea that a driver circuit for an LED has a connection for a mains voltage, a filter circuit and a rectifier, an inductance and at least one switch.
  • the inductance is magnetized when the switch is closed, and the inductance is demagnetized when the switch is open, and at least during the phase of the
  • Demagnetization feeds the current through the inductance of the LED.
  • a capacitor is coupled to a first terminal at the node between the rectifier and the unidirectional decoupler, coupled to its second terminal to the LED current or transformer.
  • Fig. 1 shows the prior art
  • Fig. 2 shows an embodiment of a device according to the invention The invention will be explained with reference to an embodiment of FIG. 2 with a driver circuit for an LED.
  • a driver circuit for an LED comprising a connection for a mains voltage, a filter circuit Ll, a rectifier GR, and a latching element Cl, a potential-separated switching regulator circuit with at least one switch Sl and a transformer L2, at whose output at least one LED is connected, wherein a unidirectional Entkoppelglied Dl between the rectifier and the latching element Cl is included.
  • the driver circuit has a monitoring circuit Ul, which activates the switch Sl. About the control and timing of the at least one switch Sl, which is connected to the primary side L2p, the transformer L2 is alternately up and demagnetized.
  • a capacitor C3 is coupled with a first terminal to the node between rectifier GR and the unidirectional decoupler Dl, and this capacitor C3 is connected to its second terminal to the LED current ILED or the
  • Coupled transformer L2 via the capacitor C3, a direct or indirect feedback of the LED current ILED, whereby a uniform and defined charge of the latch element Cl is made possible by this feedback.
  • a uniform current consumption is made possible via the connection for the mains voltage, since the capacitor C3 is recharged high frequency by means of the feedback.
  • the capacitance of the capacitor C3 and the frequency with which the transhipment occurs determine the amount of transmitted energy.
  • the driver circuit according to the invention by the uniform current consumption form a load for the dimmer, which allow trouble-free operation, for example, without flicker, even when dimming.
  • the capacitor C3 When the voltage at the second terminal of the capacitor C3 has a low potential, then the capacitor C3 is charged via the rectifier GR, while the unidirectional decoupling member Dl blocks a direct current flow from the rectifier GR into the latching element Cl. When the voltage at the second terminal of the capacitor C3 has a high potential, the capacitor C3 discharges via the decoupling element Dl in the latch element Cl, while now the rectifier GR blocks a direct current flow from the rectifier GR in the latch element Cl.
  • the permanent charge of the capacitor C3 may be due to the high-frequency clocking of the switch Sl and the associated high-frequencyderslust. Current change in the output circuit, in particular at the transformer L2 and possibly also at the LED result.
  • the coupling of the capacitor C3 to the LED current ILED can take place via a second transformer whose primary winding L3a is traversed by the LED current ILED and whose secondary winding L3b is coupled to the capacitor C3.
  • the coupling of the capacitor C3 to the transformer L2 can be done by an additional secondary winding on the transformer L2.
  • This additional secondary winding is magnetically coupled to the other windings of the transformer L2.
  • the second terminal of the capacitor C3 is thus preferably connected to an inductor L3b connected in series with the capacitor C3, wherein the inductance L3b flows through either as a further secondary winding on the transformer L2 or as a secondary winding of another transformer whose primary winding L3a is flowed through by the LED current ILED. is trained.
  • the coupling of the capacitor C3 to the LED current ILED can also take place indirectly, for example via a second transformer whose primary winding L3a is connected in parallel with the LED or at least one LED and whose secondary winding L3b is coupled to the capacitor C3.
  • An indirect coupling to the LED current ILED is for example a coupling to the transformer L2, since the transformer L2 feeds the LED via the smoothing circuit (D2, C2).
  • this feedback circuit is connected to a coupling point in the driver circuit, which has an alternating voltage potential due to the timing of the switch Sl (Since it is in the driver circuit to a high-frequency clocked
  • Switching controller is not only the voltage across the switch Sl is a harnessfreuqent changing voltage, but also the potentials on the affected passive components change due to this timing).
  • a coupling point can be, for example, the connection to an inductance L3b connected in series with the capacitor C3, the inductance L3b being passed through, for example, either as a further secondary winding on the transformer L2 or as a secondary winding of a further transformer whose primary winding L3a is flowed through by the LED current ILED. can be trained.
  • the coupling of the capacitor C3 to the LED current ILED can also be effected indirectly in that the capacitor C3 is coupled on the primary side of the transformer L2, for example directly or via an additional inductance to the primary winding L2p of the transformer L2.
  • other coupling points are possible, for example at a different point in the output circuit (in particular on the secondary side of the transformer L2, for example via the LED).
  • the latching element Cl can be formed by a smoothing capacitor.
  • the latching element C1 may alternatively be formed by a passive valley control circuit.
  • the monitoring circuit U1 can be, for example, an integrated circuit (for example an ASIC, microcontroller or DSP). As already mentioned, the monitoring circuit U1 can also activate the switch S1. In this case, the
  • Monitoring circuit Ul for example, on the one hand monitor the current through the switch Sl by means of a current detection Ip (for example, a current shunt) and additionally monitor the current amplitude of the supply voltage Vin.
  • the control of the switch (S1) may depend on further monitoring, for example, by monitoring the demagnetization of the inductance L2, the detected voltage of the LED or the detected amplitude of the current through the LED ILED.
  • all feedbacks or monitors on the secondary side are electrically isolated, i. the feedback of the detected on the output side (secondary side) signals to the monitoring circuit Ul via a potential separation (for example by means of optocoupler or transformer).
  • the switch-off duration of the switch S1 depends on the detected amplitude of the current through the LED ILED.
  • the switch Sl can always be switched on by the monitoring circuit U1 when the demagnetization of the transformer L2 is detected by the monitoring circuit U1. Switching on the switch Sl can also be controlled by the monitoring circuit U1 so that it always takes place only when the transformer L2 is de-magnetized.
  • Demagnetization can be detected by means of the monitoring circuit Ul, for example by means of a voltage monitoring across the transformer L2 (for example by means of an additional secondary winding) or via the switch Sl.
  • the turn-on and / or turn-off of the switch Sl, which is specified by the monitoring circuit Ul can be dependent on the detected amplitude of the current through the LED ILED, with a feedback of the detected on the output side (secondary side) signals, in particular the current through the LED ILED, via a potential separation.
  • the monitoring circuit U1 therefore, the detected signals are preferably supplied via a potential separation.
  • the switch-on and / or switch-off duration of the switch S1 does not decrease to zero or close to zero.
  • a limitation of the current through the LED ILED can be done by limiting the duty cycle.
  • the current detection Ip can also be done directly at the switch Sl (for example, in a so-called. SENSE FET, which contains an integrated monitoring of the current).
  • the switch-off duration of the switch S1 can be dependent on the detected amplitude of the current through the LED ILED.
  • the feedback of the detection of the amplitude of the current by the LED ILED is carried out electrically isolated (i.e., the control loop for the dependence of the switch-off of the switch Sl).
  • the switch-off duration can, however, also be fixed, for example (ie fixed).
  • the turn-off of the switch Sl for example, be directly or indirectly dependent on the demagnetization of the transformer L2.
  • the switch Sl can be turned on whenever a demagnetization of the inductance (L2) is detected. However, a switch-on can always take place only when the inductance (L2) is de-magnetized, and a certain period of time can also be between the time of demagnetization and the restart.
  • the monitoring circuit U1 can detect, for example, the voltage across the buffer element C1 or at the (positive) output of the rectifier GR1 or, if present, the voltage before the decoupling element or the voltage difference across the decoupling element (preferably by one each
  • the voltage is measured by means of a voltage divider which picks up the voltage across the latch element Cl or at the (positive) output of the rectifier GR1 and reduces to a potential which can be evaluated by the monitoring circuit U1.
  • the monitoring circuit U1 can also be designed (for example in high-voltage technology) so that it can directly detect the voltage across the buffer element C1 or at the (positive) output of the rectifier GR1.
  • the monitoring circuit Ul may be constructed discretely, but it may also be designed as an integrated circuit as mentioned. When using an integrated circuit as a monitoring circuit Ul further functions such as the direct control of the switch Sl can be integrated with.
  • the transformer L2 when demagnetized, can feed a smoothing circuit formed by a rectifier D2 and a capacitor C2.
  • an LED as a smoothing element can also assume the function of the rectifier D2 and other or even completely omitted further smoothing elements.
  • the LED are connected to the secondary side L2s of the transformer L2 directly in antiparallel connection, the transformer L2 can generate, for example, by using a center tap on the secondary side L2s two opposing voltages that feed the secondary side in time sequentially. This results in a secondary-side current with alternating amplitude, which can serve as a supply for a primary winding L3a and thus also for feeding the feedback circuit. This would be an example of the case where the feedback circuit is fed directly by the LED current ILED.
  • This further converter circuit may follow the smoothing circuit D2, C2 and have an additional switch which clocks an additional secondary-side choke (ie, a further inductance).
  • the LED can be powered by the charge and discharge of this additional secondary-side throttle with energy.
  • the coupling point for the feedback circuit may also be linked to the additional secondary-side throttle.
  • the coupling of the capacitor C3 to the LED current ILED can take place via a second transformer in such a way that the additional secondary-side throttle simultaneously acts as a primary winding L3a and is coupled to the secondary winding L3b.
  • the additional secondary-side throttle may also be arranged in series with the additional secondary-side throttle a primary winding L3a, which is coupled to the secondary winding L3b and serves to feed the feedback circuit.
  • the transformer L2 is magnetized when the switch is closed, and the transformer L2 is demagnetized when the switch Sl is opened, and at least during the demagnetization phase, the current through the transformer L2 directly or indirectly feeds the LED.
  • the switch Sl may be, for example, a field effect transistor, such as a MOSFET, or a bipolar transistor.
  • the secondary winding L2s magnetically coupled to the primary winding L2p is preferably connected to a smoothing circuit having a rectifier D2 and a capacitor C2 to which the LED can be connected.
  • the rectifier (D2) on the secondary winding L2s of the transformer can be formed by a diode D2 or by a full-wave rectifier.
  • the inductance L2 can feed a smoothing circuit during its demagnetization, this smoothing circuit can be, for example, a capacitor C2 or an LC (capacitor inductance C2-LG3) or CLC (capacitor-inductance-capacitor C2-LG3-CG3) filter.
  • the secondary side with the smoothing circuit is preferably designed so that a constant current supply of the LED is made possible.
  • the unidirectional decoupling element Dl can be formed by a diode.
  • an additional diode can optionally be interposed, preferably a fast diode, whereby additionally a capacitor can be arranged above the outputs of the rectifier GR. It can also be arranged between the rectifier GR and the junction of unidirectional decoupling Dl and capacitor C3 an inductance as a support throttle.
  • the support choke can buffer energy while a current flows from the rectifier GR into the driver circuit and release it again during a demagnetization phase.
  • the transformer L2 is controlled by more than one switch, there are basically quite different switching control topologies used, such as an isolated flow converter or an isolated half-bridge converter.
  • switching control topologies such as an isolated flow converter or an isolated half-bridge converter.
  • the course of the demagnetization of the transformer L2 and L2 can be dependent on the arrangement of the switch.
  • the switching regulator can also be operated by utilizing a resonance peaking, for example with a series or parallel resonant circuit, in order to minimize the switching losses in the switching elements (eg in the switch S1). It can thus be formed with a socket for use of the light source in a commercially available lamp base, comprising a driver circuit according to the invention for an LED.
  • At least part of the driver circuit may be integrated in the socket.
  • the driver circuit can on. be connected to a commercial dimmer.
  • the driver circuit may be designed such that the voltage which drops across the buffer element Cl can be controlled via the dimmer, and thus the brightness of the LED can be controlled.
  • a uniform charge of the latch element Cl can be carried out, wherein the position of the dimmer, the amount of energy supplied can be specified.
  • the longer the time period in which the dimmer passes a line voltage the higher the voltage across the latching element Cl may become due to the uniform charge through the feedback circuit.
  • about this voltage (over the latch element Cl) can be set by the driver circuit directly or indirectly, the brightness of the LED. For example, in the case of a fixed operation of the switch S1 (that is, with a defined frequency and duty cycle), the current through the LED ILED is directly dependent on the voltage across the intermediate storage element C1.

Landscapes

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

Abstract

L'invention concerne un circuit d'excitation pour une LED, comprenant une borne pour une tension réseau, un circuit filtrant, un redresseur GR et un élément de stockage intermédiaire C1, un circuit de régulation à découpage avec isolement galvanique comportant au moins un commutateur S1 et un transformateur L2 à la sortie duquel au moins une LED est raccordée, un élément de découplage unidirectionnel D1 étant placé entre le redresseur et l'élément de stockage intermédiaire C1, un condensateur C3 étant relié au point nodal situé entre le redresseur GR et l'élément de découplage unidirectionnel D1, et ce condensateur C3 étant relié, par sa seconde borne, au courant traversant la LED (ILED) ou au transformateur L2.
EP10721271.4A 2009-04-30 2010-04-29 Circuit d'excitation pour une led Not-in-force EP2425679B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2812009 2009-04-30
PCT/AT2010/000136 WO2010124311A1 (fr) 2009-04-30 2010-04-29 Circuit d'excitation pour une led

Publications (2)

Publication Number Publication Date
EP2425679A1 true EP2425679A1 (fr) 2012-03-07
EP2425679B1 EP2425679B1 (fr) 2015-01-28

Family

ID=42548844

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10721271.4A Not-in-force EP2425679B1 (fr) 2009-04-30 2010-04-29 Circuit d'excitation pour une led

Country Status (4)

Country Link
EP (1) EP2425679B1 (fr)
CN (1) CN102428753B (fr)
DE (1) DE112010001817A5 (fr)
WO (1) WO2010124311A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013224749B4 (de) * 2013-12-03 2025-01-23 Tridonic Gmbh & Co Kg Treiberschaltung für Leuchtmittel, insbesondere LEDs, LED-Modul und Leuchte, jeweils mit einer solchen Schaltung, sowie entsprechendes Verfahren
CN106230263B (zh) * 2016-07-28 2018-11-09 天宝电子（惠州）有限公司 一种正激式零电压开关电源变换器
WO2022246805A1 (fr) * 2021-05-28 2022-12-01 Tridonic Gmbh & Co Kg Convertisseur à diodes électroluminescentes et dispositif à del

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042830B (en) * 1979-02-12 1983-05-11 Gte Sylvania Inc Ballast circuit for discharge lamp
US6998795B2 (en) * 2004-05-06 2006-02-14 Yih-Fang Chiou Power factor correction circuit for electronic ballast
US7656103B2 (en) * 2006-01-20 2010-02-02 Exclara, Inc. Impedance matching circuit for current regulation of solid state lighting
EP2592904A1 (fr) * 2007-05-07 2013-05-15 Koninklijke Philips Electronics N.V. Appareil d'éclairage à DEL à haut facteur de puissance et procédés associés

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010124311A1 *

Also Published As

Publication number Publication date
CN102428753B (zh) 2014-08-13
DE112010001817A5 (de) 2012-05-31
WO2010124311A1 (fr) 2010-11-04
CN102428753A (zh) 2012-04-25
EP2425679B1 (fr) 2015-01-28

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