EP2837261A1 - Betriebsgerät für ein leuchtmittel und verfahren zum betreiben eines betriebsgeräts - Google Patents
Betriebsgerät für ein leuchtmittel und verfahren zum betreiben eines betriebsgerätsInfo
- Publication number
- EP2837261A1 EP2837261A1 EP13725049.4A EP13725049A EP2837261A1 EP 2837261 A1 EP2837261 A1 EP 2837261A1 EP 13725049 A EP13725049 A EP 13725049A EP 2837261 A1 EP2837261 A1 EP 2837261A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- converter
- operating device
- correction circuit
- factor correction
- 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
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]
- H05B45/10—Controlling the intensity of the light
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
-
- 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
- H05B45/59—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits for reducing or suppressing flicker or glow effects
Definitions
- 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.
- PFC active power factor correction circuit
- the object is to provide devices and methods which offer improvements with regard to the aforementioned problems.
- Task is, devices and Specify a method in which a load at the output and / or an output of the operating device can be detected.
- the object is to specify devices and methods in which, in the case of an operating device with a potential barrier, detection of a measured variable on the secondary side is not necessarily required for a load detection.
- an operating device includes a power factor correction circuit that provides a voltage to a converter.
- the transducer may be an isolated or non-isolated 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 arranged to apply a load and / or voltage associated with the output of the converter based on the evaluation of voltage ripples, in particular the peak-to-peak voltage in the voltage that the power factor correction circuit provides to the converter determines an output power of the converter.
- the methods and devices of embodiments allow the detection of a load and / or output power of the converter based on the evaluation of voltage ripples, in particular the peak-to-peak voltage 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.
- the controller may be configured to detect a number of LEDs energized by the output of the converter. These or other vice Identifications are possible based on the amplitude of voltage ripples in the voltage provided by the power factor correction circuit, without having to feed back a measure across the SELV barrier.
- the controller may determine the load using a map, such as a table query.
- the controller may use the load thus determined to determine parameters for the operation of the converter to be used for the detected load based on another characteristic, for example, another table query.
- the control device can control the operation of the operating device depending on the detected load and / or output power in different ways.
- 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 controller may set the wait time or minimum wait time before turning on the power factor switch of the power factor correction circuit. Set correction circuit in DCM mode depending on the detected load.
- the operating device can 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 may be in the form of an integrated circuit, in particular an application-specific special circuit (ASIC, "application-specific integrated circuit”).
- ASIC application-specific integrated circuit
- FIG. 1 shows a lighting system having a power factor correction circuit 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 in order to receive attenuation commands and / or to output status messages.
- 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 be connected to an AC voltage, in particular to a mains voltage, possibly via a high-frequency filter.
- 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 generates a DC voltage Vbus provided to the converter 12.
- 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, ie, has a ripple.
- the control device 14 can control the power factor correction circuit 11 and / or the converter 12 as a function of a load 3 at the output of the converter 12 and / or depending on the output power of the operating device.
- the control device 14 is set up to detect the load 3 as a function of an evaluation, in particular the peak-to-peak voltage of voltage pulses of the voltage Vbus which 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 other automatic detection of properties of the light source 3.
- the rectified AC voltage Vin is supplied to an inductance or coil 21.
- the inductance 21 is connected in series with a diode 22 between the input terminal and an output of the power factor correction circuit 20.
- the output of the power factor correction circuit 20 is connected to an input of the converter 30 and provides the voltage Vbus generated by the power factor correction circuit 20 as the supply voltage to the converter 30.
- the power factor correction circuit 20 has a charging capacitor 23 at the output of the power factor correction circuit 20.
- a controllable electronic Schafter 24 which is a circuit breaker and, for example, as a field effect transistor (FET), in particular as OSFET, may be formed connected.
- FET field effect transistor
- the switch 24 may be connected to ground via a shunt resistor (not shown).
- the switch 24 is switched by the control device 14 of the operating device 2 in the on state and the off state.
- the control device 14 has a corresponding output 52 for controlling a PFC control signal, with which, for example, the gate voltage of the switch 24 can be controlled.
- the inductance 21 When the switch 24 is switched on, the inductance 21 is connected to ground via the switch 24, the diode 22 blocking, so that the inductance 21 is charged and energy is stored in the inductance 21.
- the switch 24 is turned off, i. open, the diode 22 is conductive, so that the inductor 21 can discharge via the diode 22 in the charging capacitor 23 and the energy stored in the inductor 21 is transferred to the charging capacitor 23 capacitor.
- the switch 24 is driven by the control device 14, which may be configured in the form of an integrated circuit, in particular as an ASIC. Power factor correction is performed by repeatedly turning the power on and off Switch 24 achieved, wherein the switching frequency for the switch 24 is much larger than the frequency of the rectified AC voltage Vin.
- the Wandier 30 receives the supply voltage Vbus, which is provided by the power factor correction circuit 20 at the output of the power factor correction circuit 20.
- the transducer 30 may include an electrolyte to achieve electrical isolation between a non-SELV side of the driver 2 and a SELV side of the driver 2.
- a corresponding potential barrier 49 or SELV barrier 49 separates the non-SELV side of the operating device 2 from the SELV side of the operating device 2.
- the converter 30 has a transformer with a primary coil 34 and a secondary coil 36.
- the wander 30 may be configured as a half-bridge drive LLC resonant converter that includes an LLC resonant circuit.
- the primary winding 34 of the transformer may also act as one of the inductors of the LLC resonant circuit.
- the LLC resonant circuit includes another inductor 33 and a capacitor 35.
- the LLC resonant circuit with the inductors 33, 34 and the capacitor 35 may be configured as a series resonant circuit.
- the smaller inductance 33 of the LLC resonant circuit may also be integrated into the transformer and may be, for example, a leakage inductance of the primary coil 34.
- the converter 30 is controlled on the primary side by clocked switching of switches 31, 32 of a half-bridge.
- the switches 31, 32 can be designed as field-effect transistors (FETs), in particular as MOSFETs.
- the control device 14 can effect a mutually clocked switching of the switches 31, 32.
- the control of the switch is such that in each case a maximum of one of the switches 31, 32 is turned on.
- the control device 14 can control the half bridge with the switches 31, 32 in different operating modes. In a first mode of operation, a switching frequency of the switches 31, 32 may be changed relative to a resonant frequency of the LLC resonant circuit to achieve amplitude dimming. In a second mode of operation, the half-bridge may be controlled to result in pulsed operation of the converter 30.
- both switches 3, 32 can be connected via a period of time switched to the off state.
- the corresponding selection of the operating mode and / or of operating parameters can be carried out automatically by the control device 14 based on a detected load 3 at the output 41 and / or based on a recognized output power at the output 41 of the operating device 2.
- the detection is based on a peak-to-peak voltage of voltage ripples, as described in more detail below.
- the control device 14 is set up to generate control signals which can be controlled via a first output 53 coupled to the first switch 31 and a twelfth output 54 coupled to the second switch 32.
- the converter 30 has a secondary side with a secondary coil 36 of the transformer.
- the secondary side may comprise a rectifier with diodes 37, 38 and a capacitor 39 at the output of the rectifier.
- an inductance 40 can be connected in front of the output 41 of the converter 30. The inductance 40 may also be omitted, for example when the converter 30 is operated as a constant voltage source.
- a load 3 may be coupled to the output 41 of the converter and, in particular, may be conductively connected.
- the load 3 may comprise a plurality of light-emitting diodes (LEDs).
- the load 3, which is a luminous means, may comprise inorganic and / or organic LEDs.
- the LEDs may be connected in parallel, as shown schematically in FIG. 2 shown.
- the LEDs can also be connected in series, or a combination of series and parallel connections can be used.
- the controller 14 is configured to automatically detect the load 3 or an output power output via the output 41.
- the time-dependent voltage Vbus which provides the power factor correction circuit 20 to the converter 30 as the supply voltage, is evaluated, as described with reference to FIG. 3-6 is described in more detail.
- the controller 14 may automatically adjust the operation of the power factor correction circuit 20 and / or the converter 30 to different operating modes and / or operating parameters depending on the detected load.
- the control device 14 is supplied with a measured variable with which the control device 14 can detect the voltage Vbus.
- the control device 14 can detect the voltage Vbus in a time-resolved manner via a voltage divider with resistors 26, 27, which voltage is supplied as a supply voltage to the converter 30 by the power factor correction circuit 20.
- An A / D conversion can take place before the corresponding measured variable is fed to an input 51 of the control device 14.
- the ripple in the voltage Vbus provided by the power factor correction circuit 20 can be expressed as
- i (t) is a time-oscillating charging current of the charging capacitor and C is the capacity of the charging capacitor.
- the voltage ripples which are caused by the first term on the right side of equation (1), have a peak-to-peak voltage which depends on the load 3 at the output 41 of the converter 30, even if the output 41 is galvanically grounded Measuring point is separated, at which the voltage Vbus for the control device 14 is detected.
- the output power at the output 41 is dependent on the load R. Accordingly, for example, a reduction in the output current may result in a reduction in the peak-to-peak voltage of the voltage ripple.
- FIG. Figure 3 illustrates for the in FIG. 2 shows the dependence of the peak-to-peak voltage of the voltage ripple on the load.
- the load changes by more than a factor of ten.
- Exemplary of such a change in load is the change in the number of LEDs energized by the operating equipment. A change in the number of LEDs can also occur during operation, for example due to a failure of LEDs.
- the change in load results in a change in the peak-to-peak voltage of the voltage ripple in the voltage Vbus provided by the power factor correction circuit 20.
- the peak-to-peak voltage 70 illustrated in FIG. 3 may be detected as the difference between the maximum and minimum of the voltage Vbus in a period, that is, as a voltage difference.
- This load dependency of the peak-to-peak voltage 70 of the voltage ripple in voltage Vbus allows the detection of the load and / or output power based on an evaluation of the voltage ripple and in particular based on its voltage difference between minimum and maximum voltage Vbus.
- a characteristic as shown by way of example in FIG. 3, which sets the load in relation to the peak-to-peak voltage of the voltage ripple, may be used by the load sensing controller 14.
- a corresponding map can be used.
- FIG. 4 illustrates the determination of the peak-to-peak voltage 70 of the voltage ripple.
- the rectified AC voltage 61 is supplied to the power factor correction circuit 20.
- One period of the non-rectified AC voltage corresponds to two periods 62 of the rectified AC voltage 61.
- the voltage Vbus provided by the PF correction circuit 20 can be sampled.
- the resulting samples 65, 66, 67, 68 may be evaluated to determine a peak-to-peak voltage 70 of the voltage ripple 64.
- the amplitude of thechrosrippei is determined.
- the determined amplitude can be used to detect the load.
- the load can be determined, for example, by a table query.
- a map may be used to determine the load and / or output power based on the amplitude.
- a computational determination for example, based on an algorithm instead of the table possible.
- a compensation factor that changes over the aging of the operating device 2 can also be taken into account in the calculation.
- the changing capacity of the charging capacitor 23 may play a role, this change can be compensated.
- the control device 14 of the operating device 2 can perform other functions.
- the control device 14 of the operating device 2 may depend on the detected load, i. depending on the determined peak-to-peak voltage of the bus voltage Vbus, automatically determine an operating mode of the power factor correction circuit 20, operating parameters of the power factor correction circuit 20, an operating mode of the converter 30 and / or operating parameters of the converter 30.
- FIG. 5 shows the mode of operation of the control device 14 according to an embodiment. tion example in a function block representation.
- the control device 14 may have a logic 81 for determining the peak-to-peak voltage of the voltage ripple in the voltage Vbus that the power factor correction circuit 20 provides.
- the logic 81 may use a map to determine a load. Various functions can be adjusted based on the load at the output of the converter.
- the controller 14 may include a function 82 for selecting an operating mode of the power factor correction circuit.
- the function 82 may automatically select an operating mode for the power factor correction circuit 20 depending on the detected load.
- the function 82 may select, depending on the detected load, whether the power factor correction circuit is in a DCM ("Discontinuous Conduction Mode") mode or in the border region between continuous and continuous current through the inductance, i. in BCM (Borderline Conduction Mode or Boundary Conduction Mode) operation. If other operating modes are available for the power factor correction circuit 20, the function 82 may accordingly select one of the operating modes, for example, a continuous conduction mode (CCM) mode of operation.
- CCM continuous conduction mode
- the function 82 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 20 of the power factor correction circuit 20 in BC operation depending on the detected load Alternatively or additionally, the controller may set the wait time or minimum wait time before turning on the power switch 24 of the power factor correction circuit 20 in DCM operation depending on the detected load set.
- the controller may set the on time ("tone" time) of the power factor correction circuit 20 of the power factor correction circuit 20 in BC operation depending on the detected load Alternatively or additionally, the controller may set the wait time or minimum wait time before turning on the power switch 24 of the power factor correction circuit 20 in DCM operation depending on the detected load set.
- the control device 14 may have a function 85 for half-bridge control of the converter 30.
- the function 85 may select, depending on the detected load, whether the converter 30 is to be operated in a pulsed mode in which a half bridge or full bridge of the converter for a correct time interval! is turned off, or whether the converter 30 is to be operated in a continuous operation, for example, for amplitude dimming.
- the function 85 can automatically set operating parameters for the converter depending on the detected load, for example a switching frequency of the switches 31, 32 of the half-bridge of the converter 30.
- the control device 14 may have further functions, for example a function 83 for suppressing iast-dependent chromatic aberrations and / or a function 84 for the iast-dependent adaptation of an intensity control or intensity control of the light emitted by the luminous means 3.
- Other functions for the iast-dependent control and / or regulation of the power factor correction circuit 20 and / or the converter 30 can be realized.
- the controller 14 may be configured to map based on the various functions for adapting the operation of the operating device based on the detected load and / or output power. For this purpose, for example, further maps may be provided which indicate operating modes and / or operating parameters for the operation of the operating device 2 as a function of the load.
- the map that relates the peak-to-peak voltage of the voltage ripple to the load and the maps that relate the load to operating parameters may also be combined.
- Inductances and capacitances of the power factor correction circuit and / or of the converter can be designed as separate inductive or capacitive elements. Especially smaller inductors and capacities of the power factor correction circuit and / or the converter can also be parasitic inductances and capacitances.
- Methods and devices according to embodiments can be used in operating devices for lighting, for example, in an electronic ballast or an LED converter.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012007453 | 2012-04-13 | ||
| DE102012014308A DE102012014308A1 (de) | 2012-04-13 | 2012-07-19 | Betriebsgerät für ein Leuchtmittel und Verfahren zum Betreiben eines Betriebsgeräts |
| PCT/AT2013/000071 WO2013152373A1 (de) | 2012-04-13 | 2013-04-15 | Betriebsgerät für ein leuchtmittel und verfahren zum betreiben eines betriebsgeräts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2837261A1 true EP2837261A1 (de) | 2015-02-18 |
| EP2837261B1 EP2837261B1 (de) | 2018-10-10 |
Family
ID=49232029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13725049.4A Not-in-force EP2837261B1 (de) | 2012-04-13 | 2013-04-15 | Betriebsgerät für ein leuchtmittel und verfahren zum betreiben eines betriebsgeräts |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2837261B1 (de) |
| CN (1) | CN104412707B (de) |
| DE (1) | DE102012014308A1 (de) |
| WO (1) | WO2013152373A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013222892B4 (de) * | 2013-11-11 | 2024-05-16 | Tridonic Gmbh & Co Kg | LED-Konverter und Verfahren zum Steuern einer Wandlerschaltung eines LED-Konverters |
| DE102015207433A1 (de) * | 2015-04-23 | 2016-11-10 | Tridonic Gmbh & Co Kg | Betriebsschaltung, Leuchte und Verfahren zum Erfassen eines Steuersignals |
| EP3854179B1 (de) * | 2018-10-26 | 2023-12-13 | Tridonic GmbH & Co KG | Verfahren und vorrichtung zur parametereinstellung für eine elektrische vorrichtung |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6700335B2 (en) * | 2001-09-28 | 2004-03-02 | Osram Sylavania, Inc. | Method and circuit for regulating power in a high pressure discharge lamp |
| DE602006013616D1 (de) | 2006-07-20 | 2010-05-27 | St Microelectronics Srl | Vorrichtung und Verfahren zum Erkennen der Versorgungsleistung einer Entladungslampe |
| US7759881B1 (en) * | 2008-03-31 | 2010-07-20 | Cirrus Logic, Inc. | LED lighting system with a multiple mode current control dimming strategy |
| DE102008027029A1 (de) * | 2008-06-06 | 2009-12-10 | Tridonicatco Gmbh & Co. Kg | Lampentyperkennung durch Leistungsfaktorkorrekturschaltung |
| CN201557292U (zh) * | 2009-10-01 | 2010-08-18 | 英飞特电子(杭州)有限公司 | 一种高效率恒流led驱动器 |
| CN201533427U (zh) * | 2009-11-24 | 2010-07-21 | 浙江摩根电子科技有限公司 | Llc自激半桥谐振led驱动器 |
| DE102010031247A1 (de) * | 2010-03-19 | 2011-09-22 | Tridonic Ag | Niedervolt-Spannungsversorgung für ein LED-Beleuchtungssystem |
| DE102010031239A1 (de) * | 2010-03-19 | 2011-09-22 | Tridonic Ag | LED-Ansteuerung mit getakteter Konstantstromquelle |
| CN201789664U (zh) * | 2010-08-20 | 2011-04-06 | 深圳市雅玛西电子有限公司 | 一种半桥llc谐振led电源 |
| CN101932175B (zh) * | 2010-08-31 | 2013-03-13 | 电子科技大学 | 一种具有自动调光功能的照明led恒流驱动电路 |
-
2012
- 2012-07-19 DE DE102012014308A patent/DE102012014308A1/de not_active Withdrawn
-
2013
- 2013-04-15 CN CN201380019677.3A patent/CN104412707B/zh not_active Expired - Fee Related
- 2013-04-15 WO PCT/AT2013/000071 patent/WO2013152373A1/de not_active Ceased
- 2013-04-15 EP EP13725049.4A patent/EP2837261B1/de not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013152373A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104412707A (zh) | 2015-03-11 |
| CN104412707B (zh) | 2017-03-08 |
| WO2013152373A1 (de) | 2013-10-17 |
| EP2837261B1 (de) | 2018-10-10 |
| DE102012014308A1 (de) | 2013-10-17 |
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