AT13438U1 - Operating device for a light source - Google Patents

Operating device for a light source Download PDF

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Publication number
AT13438U1
AT13438U1 ATGM148/2012U AT1482012U AT13438U1 AT 13438 U1 AT13438 U1 AT 13438U1 AT 1482012 U AT1482012 U AT 1482012U AT 13438 U1 AT13438 U1 AT 13438U1
Authority
AT
Austria
Prior art keywords
converter
operating device
output
factor correction
correction circuit
Prior art date
Application number
ATGM148/2012U
Other languages
German (de)
Original Assignee
Tridonic Gmbh & 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 & Co Kg filed Critical Tridonic Gmbh & Co Kg
Priority to ATGM148/2012U priority Critical patent/AT13438U1/en
Publication of AT13438U1 publication Critical patent/AT13438U1/en

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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies
    • Y02B20/16Gas discharge lamps, e.g. fluorescent lamps, high intensity discharge lamps [HID] or molecular radiators
    • Y02B20/18Low pressure and fluorescent lamps
    • Y02B20/183Specially adapted circuits
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion
    • Y02B70/12Power factor correction technologies for power supplies
    • Y02B70/126Active technologies

Abstract

An operating device for a lighting device, comprising: a power factor correction circuit, a converter connected to the power factor correction circuit and having an output for supplying power to the lighting device, and a control device having an input for detecting a voltage provided to the converter by the power factor correction circuit, wherein the controller is arranged to determine an amplitude of voltage ripples of the voltage and to determine, based on the amplitude, a load connected to the output of the converter and / or an output power of the converter.

Description

Austrian Patent Office AT 13 438 Ul 2013-12-15

description

OPERATING DEVICE FOR A LAMP

The invention relates to a control gear for a light source. In particular, the invention relates to such operating devices having a power factor correction circuit.

Power Factor Correction (PFC) is used to eliminate or at least reduce harmonic currents in an input current. Harmonic currents can occur, in particular in the case of non-linear consumers, such as, for example, rectifiers with subsequent smoothing in power supplies, since in such consumers the input current is shifted in phase and distorted in a non-sinusoidal manner despite the sinusoidal input voltage. The occurring higher-frequency harmonics can be counteracted by an active or clocked power factor correction circuit upstream of the respective device. Power factor correction circuits are also used in operating devices for lamps, for example in electronic ballasts for discharge lamps or LED converters. The use of such circuits in devices for operating lamps is useful, since standards restrict the permissible return of harmonics in the supply network.

It is generally desirable to be able to use operating devices for different light sources, for example for LED modules with different numbers of LEDs. It is desirable to provide operating devices that can automatically detect a load connected to the output of the converter. This allows to adapt the control of the operating equipment to the load, if necessary. For this purpose, the operating device information can automatically determine a measured value based on a measurement and adjust an operating parameter depending on the measured value.

EP 1 881 745 A1 describes that a lamp type detection is carried out on the basis of a helical resistance measurement. Ignition parameters are set according to this lamp type detection and the lamp is started. From the ignition voltage is closed to the power and in turn from this power to the present at the correct lamp type detection for this power parameters for a power factor correction circuit.

WO 2009/146934 A2 describes methods and devices in which, based on a parameter of an active power factor correction circuit ("PFC"), in particular the measured on-time of a PFC switch, at least one operating parameter of the operating device is set.

The detection of a load at the output of the operating device can be particularly challenging if the operating device is a so-called SELV ("Separated Extra-Low Voltage" or "Safety Extra-Low Voltage") device. In such a device, there is a potential separation between a SELV side with low voltages and a non-SELV side, which is galvanically isolated from the SELV side for safety reasons. Such a galvanic isolation or electrical isolation is required for safety reasons in operating devices for lighting to separate an ELV ("Extra-Low Voltage") - area by a so-called potential barrier or SELV barrier of areas with higher supply voltage, especially mains voltage.

Conventional approaches to the detection of characteristics of a load at the output of the transducer, i. at the output of the SELV side, involve the acquisition of a measurand on the SELV side. However, a corresponding evaluation and control then requires the use of a corresponding logic on the SELV side or the feedback of the measured variable via the SELV barrier. Both approaches are associated with additional circuit complexity.

The object is to provide devices and methods that offer improvements in terms of the problems mentioned. The task is to specify devices and procedures that can be used to detect a load at the output and / or an output power of the operating device. The object is to provide devices and methods in which in a control gear with a potential barrier load detection must not be performed based on a detection of a measured variable on the secondary side.

According to the invention control gear for a lamp and a method with the features specified in the independent claims are given. The dependent claims define advantageous and preferred embodiments of the invention.

In methods and apparatus of embodiments, an operating device includes a power factor correction circuit that provides a voltage to a converter. The transducer may be a resonant converter, such as an LLC resonant converter. An output of the converter, which can also serve as the output of the operating device, supplies a lighting means with energy during operation. A power factor correction circuit controller may be configured and configured to determine, based on an amplitude of voltage ripple in the voltage that the power factor correction circuit provides to the converter, a load connected to the output of the converter and / or an output power of the converter.

The methods and apparatus of embodiments allow the detection of a load and / or output power of the converter based on the amplitude of voltage ripples in the voltage provided by the power factor correction circuit. The measured variable, which is evaluated for load detection, is recorded on the primary side. The detection of a measured variable on the SELV side of the operating device is not absolutely necessary for load detection.

Illustrative of the detection of different loads, the controller may be configured to detect a number of LEDs, which are powered by the output of the converter with energy. This is possible based on the amplitude of voltage ripple in the voltage provided by the power factor correction circuit, without having to return a measurand across the SELV barrier.

The controller may determine the load using a map, for example, by table query. The controller may use the load thus determined to determine based on another map, for example, by another table query, parameters for the operation of the converter to be used for the detected load. The control device can control the operation of the operating device depending on the detected load and / or output power in different ways.

In one embodiment, the control device may be configured to set a light intensity of the light source depending on the detected load to a target value. Alternatively or additionally, the control device can be set up to suppress a color shift depending on the detected load. Alternatively or additionally, the control device can be set up to suppress flickering depending on the detected load.

The control device can act in different ways on the operation of the operating device to control this depending on the detected load. The controller may select an operation mode for the power factor correction circuit depending on the detected load. The controller may select, depending on the detected load, whether the power factor correction circuit is operating in a DCM ("Discontinuous Conduction Mode") mode or at the boundary between continuous and continuous current through the inductance, i. in BCM (Borderline Conduction Mode or Boundary Conduction Mode) operation. The controller may also select operating parameters for the power factor correction circuit depending on the detected load. For example, the controller may set the on-time (" tone " time) of the power factor correction circuit breaker in BCM operation depending on the detected load. Alternatively or additionally, the control device can set the waiting time or minimum waiting time prior to switching on in accordance with the recognized load in the circuit breaker of the power factor correction circuit in the DCM mode 2/10 Austrian Patent Office AT 13 438 Ul 2013-12-15.

The controller may also select an operating mode for the converter depending on the detected load. The controller may select, depending on the detected load, whether the converter is to be operated in a pulsed mode in which a half-bridge or full-bridge of the converter is turned off for a certain time interval, or whether the converter is to be operated in a continuous mode, for example Amplitudendimmen. Depending on the detected load, the control device can automatically set operating parameters for the converter, for example a switching frequency of switches of the half bridge or full bridge of the converter.

The operating device may be configured as a constant current source. The operating device can also be designed as a constant voltage source. The operating device can be designed so that a control takes place on the output voltage of the operating device.

The control device can in the form of an integrated circuit, in particular an application-specific special circuit (ASIC, "Application Specific Integrated Circuit"), configured, its method according to the various embodiments and the effects thus achieved correspond to the embodiments of the operating device according to embodiments.

The invention will be explained below with reference to the drawings based on preferred embodiments.

FIG. 1 shows a lighting system having a power factor correction circuit according to an embodiment.

FIG. 2 shows a circuit diagram of an operating device according to an exemplary embodiment.

FIG. FIG. 3 illustrates a load detection based on an amplitude of a voltage dip of a bus voltage employed by the controller of an operating device according to an embodiment. FIG.

FIG. 4 illustrates the determination of an amplitude of stress ribs employed by the controller of an operating device according to an embodiment.

FIG. 5 schematically illustrates functional units of the control device of an operating device according to an exemplary embodiment.

FIG. 6 is a block diagram representation of a controller of an operating device according to an embodiment.

FIG. 1 shows a block diagram representation of a lighting system 1, which comprises an operating device 2 for a luminous means 3, for example for LEDs. The operating device 2 may be connected to a bus 4 or a wireless communication system to receive dimming commands and / or to output status messages.

The operating device 2 may be configured, for example, as an electronic ballast (ECG) for a gas discharge lamp, fluorescent lamp or other fluorescent illuminant or as an LED converter. The operating device 2 has a rectifier 10 for rectifying a supply voltage, for example the mains voltage. The operating device 2 has a power factor correction circuit 11. The operating device 2 has a control device 14. The power factor correction circuit provides a voltage Vbus, also referred to as a bus voltage, to downstream components of the operating device 2. Another voltage conversion and / or dimming functions can be achieved, for example, via a converter 12, which can be designed as a resonant converter. The converter 12 may include a transformer or other converter to achieve galvanic isolation between a SELV side and a non-SELV side of the operating device. The rectifier 10 can, possibly via a high-frequency filter, be connected to an alternating voltage, in particular to a mains voltage. The power factor correction circuit 11 may receive a rectified AC voltage from the rectifier 10 as an input voltage. The power factor correction circuit 11 performs smoothing functions and basically generates a DC voltage Vbus provided to the converter 12. However, the voltage generated by the power factor correction circuit 11, which is used as the supply voltage for the converter 12, still has voltage ripples, i. has a ripple.

The operation of the operating device 2 and in particular of the control device 14 will be described with reference to FIG. 2-6 described in more detail. In general, the control device 14 may control the power factor correction circuit 11 and / or the converter 12 depending on a load 3 at the output of the converter 12 and / or depending on the output power of the operating device. The controller 14 is configured to detect the load 3 in response to an amplitude of voltage ridge in the voltage Vbus that the power factor correction circuit 11 provides to the converter 12. The controller 14 may control the operation of the operating device depending on the detected load. Exemplary for the detection of the load is the automatic detection of a number of LEDs or the otherwise automatic detection of properties of the luminous means 3.

FIG. 2 is a circuit diagram of the operating device 2 according to one embodiment.

Methods and devices according to embodiments can be used in operating devices for lighting, for example in an electronic ballast or an LED converter. 4.10

Claims (14)

  1. Austrian Patent Office AT 13 438 Ul 2013-12-15 Claims 1. An operating device for a lighting device, comprising: a power factor correction circuit, a converter, which is connected to the power factor correction circuit and having an output for powering the illuminant, and a control device with an input for detecting a voltage provided by the power factor correction circuit to the converter, the controller being configured to determine an amplitude of voltage ripple in the voltage and to determine a load and / or an output power of the converter based on the amplitude of a load connected to the output of the converter.
  2. 2. Operating device according to claim 1, wherein the control device is adapted to determine during a time interval samples of the voltage.
  3. 3. The apparatus of claim 2, comprising a rectifier coupled to the power factor correction circuit and configured to rectify an AC voltage, wherein the time interval comprises at least one period of the AC voltage.
  4. 4. Operating device according to claim 2 or claim 3, wherein the control means is arranged to determine the amplitude based on a difference between a detected during the time interval maximum sample and a detected during the time interval minimum sample.
  5. 5. Operating device according to one of the preceding claims, wherein the control device is adapted to determine by a table query based on the amplitude of the load connected to the output of the converter.
  6. 6. Operating device according to claim 5, wherein the control device is adapted to determine by the table query a number of connected to the output of the converter LEDs.
  7. 7. Operating device according to one of the preceding claims, wherein the output of the converter is galvanically isolated from an input of the converter, which is connected to the power factor correction circuit.
  8. 8. Operating device according to claim 7, wherein the converter is designed as LLC resonant converter.
  9. 9. Operating device according to claim 8, wherein the control means is arranged for a half-bridge drive of the LLC resonant converter, wherein the control means is arranged to adjust the half-bridge drive depending on the load and / or the output power.
  10. 10. Operating device according to one of the preceding claims, wherein the control device is arranged to control the power factor correction circuit and / or the converter depending on the determined load and / or output power to set a light output from the light source to a desired value.
  11. 11. Operating device according to one of the preceding claims, which is designed as an LED converter.
  12. 12. Operating device according to one claims 1 -10, which is designed as a ballast for a discharge lamp. 5/10 Austrian Patent Office AT13 438U1 2013-12-15
  13. 13. A method of operating an operating device for a lighting device, the operating device comprising a power factor correction circuit and a converter connected to the power factor correction circuit and having an output for powering the light source, the method comprising: detecting one of the power factor correction circuit provided to the converter Voltage, determining an amplitude of voltage ripple in the voltage and determining a load connected to the output of the transducer and / or an output power of the transducer based on the determined amplitude of the voltage ripple.
  14. 14. The method of claim 13, which is carried out with the operating device according to one of claims 1-12. 4 sheets of drawings 6/10
ATGM148/2012U 2012-04-13 2012-04-13 Operating device for a light source AT13438U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ATGM148/2012U AT13438U1 (en) 2012-04-13 2012-04-13 Operating device for a light source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATGM148/2012U AT13438U1 (en) 2012-04-13 2012-04-13 Operating device for a light source

Publications (1)

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AT13438U1 true AT13438U1 (en) 2013-12-15

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5568041A (en) * 1995-02-09 1996-10-22 Magnetek, Inc. Low-cost power factor correction circuit and method for electronic ballasts
WO2010143944A1 (en) * 2009-06-12 2010-12-16 Online Services B.V. Power factor corrector device for a dimming circuit
CN201846506U (en) * 2010-10-09 2011-05-25 大连森谷新能源电力技术有限公司 High efficiency light-emitting diode (LED) circuit driven by constant current source
US20110221346A1 (en) * 2010-11-23 2011-09-15 O2Micro, Inc. Circuits and methods for driving light sources

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5568041A (en) * 1995-02-09 1996-10-22 Magnetek, Inc. Low-cost power factor correction circuit and method for electronic ballasts
WO2010143944A1 (en) * 2009-06-12 2010-12-16 Online Services B.V. Power factor corrector device for a dimming circuit
CN201846506U (en) * 2010-10-09 2011-05-25 大连森谷新能源电力技术有限公司 High efficiency light-emitting diode (LED) circuit driven by constant current source
US20110221346A1 (en) * 2010-11-23 2011-09-15 O2Micro, Inc. Circuits and methods for driving light sources

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