EP2774460A2 - Getaktete schaltung für betriebsgeräte für leuchtmittel - Google Patents
Getaktete schaltung für betriebsgeräte für leuchtmittelInfo
- Publication number
- EP2774460A2 EP2774460A2 EP12846161.3A EP12846161A EP2774460A2 EP 2774460 A2 EP2774460 A2 EP 2774460A2 EP 12846161 A EP12846161 A EP 12846161A EP 2774460 A2 EP2774460 A2 EP 2774460A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- circuit
- monitoring circuit
- operating device
- coupling element
- 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
- 238000005286 illumination Methods 0.000 title abstract 3
- 239000004065 semiconductor Substances 0.000 claims abstract description 65
- 238000012544 monitoring process Methods 0.000 claims abstract description 60
- 230000008878 coupling Effects 0.000 claims abstract description 44
- 238000010168 coupling process Methods 0.000 claims abstract description 44
- 238000005859 coupling reaction Methods 0.000 claims abstract description 44
- 230000008859 change Effects 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims description 75
- 238000004804 winding Methods 0.000 claims description 9
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- 238000000034 method Methods 0.000 claims description 5
- 238000011156 evaluation Methods 0.000 claims description 2
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- 230000004907 flux Effects 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
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- 230000003247 decreasing effect Effects 0.000 description 2
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- 241000282326 Felis catus Species 0.000 description 1
- 102000005591 NIMA-Interacting Peptidylprolyl Isomerase Human genes 0.000 description 1
- 108010059419 NIMA-Interacting Peptidylprolyl Isomerase Proteins 0.000 description 1
- 101150087393 PIN3 gene Proteins 0.000 description 1
- 102000007315 Telomeric Repeat Binding Protein 1 Human genes 0.000 description 1
- 108010033711 Telomeric Repeat Binding Protein 1 Proteins 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
Definitions
- the invention relates generally to the field of control devices for lighting means, e.g. Gas discharge lamps having a primary side clocked and galvanically isolated transmitter as a coupling element for the main light output of the lamps and / or for a secondary power, such as, heating, low-voltage supply, interface supply, etc.
- lighting means e.g. Gas discharge lamps having a primary side clocked and galvanically isolated transmitter as a coupling element for the main light output of the lamps and / or for a secondary power, such as, heating, low-voltage supply, interface supply, etc.
- the present invention relates in particular to a circuit for heating bulbs, such as gas discharge lamps and in particular fluorescent lamps, as used by operating devices for these bulbs, z. B. in electronic ballasts (ECGs), operated.
- bulbs such as gas discharge lamps and in particular fluorescent lamps
- ECGs electronic ballasts
- ECGs Electronic ballasts for fluorescent lamps are known from the prior art, which use Wendel carvingscrien. These are connected by means of a coupling element with a primary side.
- the primary side is supplied with a voltage.
- the heating energy transformer, capacitive, etc. are coupled to the secondary circuit, which in turn is connected to the coils.
- Some of the transformer-type helical heating systems use a switch-clocked Flyback Power Converter, hereafter referred to as a flyback converter.
- WO 00/72640 AI shows a coil heater with a heating transformer having a connected to an output of an inverter of an electronic ballast primary winding.
- the heating transformer of a arranged in a heating circuit with a coil secondary winding for heating each of the two coils of a gas discharge lamp.
- a series circuit is provided which includes the primary winding of the heating transformer and an electronic switch device.
- WO 00/72642 shows a heater that is powered starting from the midpoint of an inverter. This type of supply of a heater can in principle also be applied to the invention, however, represents only one example of the supply of heating.
- WO 2009/000475 A2 describes a system for operating a light-emitting diode arrangement.
- the system includes a sense means for a current through the LED array and a voltage drop across the light emitting diode array. It also has means for determining the number and color of the LEDs of the light-emitting diode array based on information from the detection means.
- US 2011/068715 Al describes a composite light source that compensates for changes in electrical efficiency with increasing operating temperature.
- the composite light source generates light depending on an operating current through the composite light source and a temperature.
- the compound light source includes a primary light source and a compensation light source.
- the primary light source and the equalizing light source convert electrical current into light, each light source being characterized by an electrical efficiency that decreases with increasing temperature and increasing current.
- the compound light source includes a temperature sensor that measures the temperature of the primary light source and a current divider circuit that splits the operating current between the primary light source and the equalizing light source to allow the primary light source efficiency to decrease at a temperature above the operating temperature by supplying power to the equalization light source compensate.
- EP 2 312 912 A2 describes a circuit for temperature control of an LED, which allows a change in the intensity of the LED depending on the ambient temperature. There will be a
- Temperature information provided by a sensor is provided by a sensor.
- WO 2006/111263 a flyback heater for a circuit for heating at least one filament of a gas discharge lamp is described, as it can in principle also be used in the present circuit.
- the circuit has a coupling element which is clocked on the primary side and transmits heating energy from a primary side supplied with voltage to a secondary side, which in turn is connected to at least one coil to be heated. The transmission of heating energy is thus under galvanic isolation.
- the coupling element is preferably a flyback converter, in particular a flyback converter, which is used for heating a coil, for example a gas discharge lamp.
- This high degree of heating possibly leads to a heating of the components of the heating circuit. This heating is particularly critical when the heating circuit
- Semiconductor components eg., Semiconductor switches such as field effect transistors (FET) and / or diodes
- FET field effect transistors
- diodes Semiconductor switches
- the semiconductor devices may be damaged or destroyed.
- the situation also exacerbates when at the same time there is a high ambient temperature of the circuit or the operating device / ballast for operating the lamp.
- the present invention therefore provides a circuit which accommodates this situation and which counteracts damage or destruction of the semiconductor devices.
- the invention therefore provides apparatus and a method as claimed in the independent claims.
- the dependent claims further form the central idea of the invention in a particularly advantageous manner.
- the invention provides a control device for lighting means, in particular for gas discharge lamps, having a circuit comprising a galvanically isolated and actively pulsed by means of at least one switch coupling element which transmits energy from a powered primary side to a secondary side, wherein the Coupling element on the primary side and / or secondary side has at least one semiconductor device, and a monitoring circuit which is adapted to indirectly detect a temperature at the at least one semiconductor device by means of an electrical parameter and depending on the detected temperature to change the dimming level of the lighting means.
- this circuit is a circuit for heating at least one filament of a dimmable gas discharge lamp.
- the coupling element transmits a heating energy from a voltage-supplied primary side to a secondary side, which is connected to the coil to be heated.
- the coupling element has at least one semiconductor component on the primary side and / or secondary side.
- a monitoring circuit is set up to detect a temperature at the at least one semiconductor component indirectly by means of an electrical parameter and / or optionally directly by means of a temperature sensor and to change the dimming level of the gas discharge lamp depending on the detected temperature and directly or indirectly the transmitted heating power.
- the sensed electrical parameter may be a voltage / current value, a resistance value, a voltage / current value change, a resistance value change, and / or a result of a voltage / current value calculation.
- the at least one semiconductor device may be a semiconductor switch arranged on the primary side, which is set up to clock the coupling element on the primary side.
- the monitoring circuit may be configured to determine the temperature at the semiconductor switch by measuring a switch-on resistance and / or a voltage drop across the semiconductor switch.
- the at least one semiconductor device may be a diode disposed on the secondary side, and the monitoring circuit may be configured to determine a forward voltage at the diode.
- the monitoring circuit may also be configured to determine the forward voltage by measuring an anode voltage and a cathode voltage of the diode.
- the monitoring circuit may be further configured to determine the anode voltage of the diode indirectly via a stored winding ratio of the coupling element and the voltage.
- the monitoring circuit may be configured to increase the dimming level while reducing the heat energy transferred, or vice versa.
- the monitoring circuit may be configured to change the transmitted heating energy by changing the timing of the semiconductor device and / or by changing, eg, lowering or raising, a voltage supplied to the circuit, eg, a bus voltage.
- the monitoring circuit may be configured to change the transmitted heating energy and / or the dimming level as a function of at least one predetermined threshold value for the detected temperature.
- the monitoring circuit may be adapted to adjust the dimming level and the transmitted heating energy to an adjustment of the detected temperature with a stored table, e.g. a lookup table, and / or to change the evaluation of a stored function.
- a stored table e.g. a lookup table
- the monitoring circuit may be implemented by hardware, e.g. by means of an ASIC.
- the table, the function and / or the winding ratio can be stored in the monitoring circuit.
- the monitoring circuit may be configured to detect the measured on resistance of the semiconductor switch and / or the voltage drop across the semiconductor switch and a further parameter from another semiconductor device via the same access point of the monitoring circuit.
- the measurement of the on-resistance and / or the voltage drop can be done with a closed semiconductor switch and the determination of other parameters can be done with open semiconductor switch.
- the further semiconductor component may be the diode and the further parameter may be the forward voltage at the diode.
- the coupling element may be part of a flyback converter, in particular a flyback converter.
- the primary side of the coupling element can be fed from the midpoint voltage of a half-bridge or full-bridge inverter, or be supplied by a DC voltage supplying the inverter.
- the invention provides a method for heating at least one filament of a dimmable gas discharge lamp, wherein a galvanically isolated and preferably actively cycled by a switch coupling element transmits a heating energy from a voltage-supplied primary side to a secondary side to be heated with the Wendel, wherein the coupling element on the primary side and / or secondary side has at least one semiconductor device, and wherein a monitoring circuit detects a temperature at the at least one semiconductor device indirectly, by means of an electrical parameter, and / or directly by means of a temperature sensor and depending on the detected temperature Dimming level of the gas discharge lamp and indirectly or directly changed the transmitted heating power.
- the invention provides an integrated, preferably digital, control circuit, such as ASIC or microcontroller, for performing of the method as described above.
- the invention provides an operating device for lighting means, e.g. OLED, halogen lamps or LED, ready with a clocked supply circuit, comprising: a galvanically isolated and preferably actively timed by a switch coupling element is provided, which transfers energy from a powered primary side to a secondary side connected to a load to be fed is, wherein the coupling element on the primary side and / or secondary side has at least one semiconductor device as part of the feed circuit, and a monitoring circuit, which is adapted to a temperature at the at least one semiconductor device indirectly, by means of an electrical parameter, and / or optionally directly by means of a temperature sensor to detect and depending on the detected temperature, the dimming level of the lamps and directly or indirectly to change the transmitted power.
- a galvanically isolated and preferably actively timed by a switch coupling element is provided, which transfers energy from a powered primary side to a secondary side connected to a load to be fed is, wherein the coupling element on the primary side and / or secondary side has at least one semiconductor device
- Fig. 1 shows a schematic representation of a
- FIG. 4b show by way of example two embedding of the circuit of FIG. 1 in systems. shows in a diagram an increase of the resistance Rds_ on (drain-Sou ce-channel
- Fig. 1 shows schematically a total operating device (ballast electronic ballast) for a lamp as a starting point for the invention.
- the overall operating device is usually operated with mains voltage or an AC supply voltage U AC .
- operation with a DC voltage can also be provided which, for example, is provided by a battery (eg in an emergency light mode).
- this voltage is usually rectified by a rectifier GL and optionally filtered with a filter.
- the rectified AC supply voltage U AC is then converted by a DC link circuit 30 to a suitable Busspannuhg U bus .
- the DC link circuit 30 may have other functions, such as ensuring a sinusoidal current consumption (power factor correction, active ie switched PFC), a stabilization of the bus voltage U bus by regulation and / or a limitation of the radiated back into the network harmonics, etc.
- the bus voltage U bU s is then converted by an inverter, preferably as a half-bridge inverter 20, formed by a half-bridge with two series-connected circuit breakers, but also as a full-bridge inverter, in a preferred operating voltage for a resonant circuit RKL, to which the lamp is preferably connected in parallel.
- the preferred operating voltage is tapped on the preferred half-bridge inverter 20 at the midpoint.
- the operation of the ballast may be dictated by one or more electronic control and / or regulating units.
- electronic control and / or regulating units For the sake of simplicity, only a single electronic control and / or regulating unit SE is provided in FIG.
- Various parameters from the range of the AC supply voltage U A c, the region of the intermediate circuit 30, the region of the half-bridge inverter 20 and / or the region of the load or resonant circuit RKL and the lamp can be fed back to this electronic control and / or regulating unit SE ,
- the control and / or regulating unit SE is able to receive, for example via an interface (not shown), external or internal control parameters, eg dimming values for setting dimming levels.
- control parameters can be supplied for example via a connected bus, which may be, for example, a digital bus according to the industry standard DALI.
- the control and / or regulating unit SE in particular dimming values can be fed, which represent a desired value for the lamp power to be set.
- the bus voltage U b us for the half-bridge inverter 20 should also be changed, for example, by the control and control unit SE.
- the control and control unit SE for example, parameters of the control of the DC link circuit 30, in particular the timing of a switch of the active PFC change, such that the bus voltage Ubus is changed.
- the heating circuit shown by way of example is supplied starting from a DC voltage supplying the half-bridge inverter 20, for example from the intermediate circuit voltage provided by the intermediate circuit 30 (switched PFC circuit).
- the heating circuit may also be powered by the mid-point voltage of the half-bridge inverter 20 (or by a full-bridge inverter).
- the circuit with the galvanically isolated and active means. at least one switch clocked coupling element also directly to the transmission for the main light output of the lamp and / or for a secondary power, such as. Low-voltage supply, Interface supply etc. serve.
- the invention can be applied to all primary side clocked and galvanically isolated coupling circuits in operating devices for lighting (eg., OLED, halogen or LED).
- Half-bridge inverter 20 can be selected.
- a feedback variable which represents the actual lamp power, for example, the lamp current I and / or the lamp voltage U can be selected.
- FIG. 2 shows by way of example a circuit 10 according to an exemplary embodiment of the invention.
- Fig. 2 shows the circuit 10 with a coupling element, which is designed as a clocked flyback converter.
- a coupling element which is designed as a clocked flyback converter.
- other transformer or capacitive designs are also possible.
- the primary side of the coupling element has a with a preferably electronic switch Sl, in particular a semiconductor switch (eg, a field effect transistor FET), 'connected in series primary coil Ll'l.
- the voltage supply is a DC voltage supply, so that a DC link voltage or a bus voltage U bus regulated by the smoothing circuit GL and by the DC link circuit (PFC, Power Factor Correction Circuit) 30 can be used in an electronic ballast.
- PFC Power Factor Correction Circuit
- other primary-side DC or AC supply voltages may also be used.
- the electronic switch Sl serves to clock the coupling element and is controlled by a control circuit, optionally with adjustable duty cycle and / or frequency.
- the circuit 10 for example, in particular a flyback converter as a clocked flyback converter, which is operated with a defined on-time T on and a frequency f.
- electrical energy is transmitted from the primary side to a secondary side, or from the primary coil LI ⁇ 1 to a secondary coil LI '2.
- a branch is shown starting from the secondary coil L1 A 2 towards a helix, here represented by an equivalent resistance R fi .
- R fi an equivalent resistance
- the secondary side can therefore supply several coils.
- the heating energy transmitted by the clocked flyback converter essentially depends on the switching frequency f and the switch-on time T on of the semiconductor switch S1.
- the electronic switch S1 can be driven by a heating control circuit 13 (see FIG. 3).
- the heating control circuit 13 may be part of. Be control unit SE or be arranged separately.
- the switch control of the electronic switch also allows independent operation of the heating circuit, which is not the case for example when coupling the heating circuit to an inverter center point without individual clocking a switch of the heating circuit.
- the independent operation of the circuit is advantageous for preheating, ignition, in which it is known that the inverter is not necessarily already operated.
- the provision of an independently timed switch in the heating circuit for a dimming operation or a 'multi-lamp operation advantageous design freedoms.
- Setpoints for the switch-on time T on and the frequency f of the switching operations of the switch Sl can be predetermined by the heating control circuit 13 (eg an ASIC or microcontroller).
- the specifications for the switch-on time T on and / or the switching frequency f of the clocked flyback converter can be determined by the control circuit, for example, depending on the current dimming state of the light source and, if necessary. calculated by (for example via the helical current) detected type of light source and then specified in the heating control circuit.
- the control circuit can receive, for example, via an interface dimming commands, for example, according to the DALI standard.
- the heating control circuit 13 can control or regulate the dimming level of the lighting means by providing at least one parameter influencing the power of the lighting means.
- This parameter can be, for example, the frequency of a half-bridge inverter whose center point feeds a resonant circuit having the luminous means.
- the primary side can also be fed from the midpoint voltage of a half-bridge inverter.
- the present invention is now particularly adapted to a temperature of the semiconductor devices used in the circuit 10, e.g. of the electronic switch Sl, with a monitoring circuit 11 (see FIG. 3), which carries out countermeasures at critical states, for example at high temperatures, in order to protect the semiconductor components against destruction or damage.
- This monitoring circuit can be, for example, part of the control circuit, or be formed separately from it.
- FIG. 2 shows on the secondary side of the circuit 10 a connected in series with the secondary coil Ll 2 diode Dl, which is arranged between the secondary coil L1 ⁇ 2 and the coil / the equivalent resistance R f n in the forward direction. Parallel to the equivalent resistance R f u, a capacitor Cl is arranged.
- the temperature of the semiconductor components on the respective component of the monitoring circuit 11, directly or indirectly, for example, is temperature-reproducing electrical parameter (U F ET / U F, and U Aue and U cat h), which are determined for the semiconductor device is detected.
- a first voltage divider ST1, which is formed through the first resistor Rl and the second resistor R2 may be for example a switch resistance (ON resistance) of the primary switch Sl, and a voltage drop U FE T across the switch Sl is detected at a first tap point PIN1 which is connected to the center point of the first voltage divider ST1.
- the switch resistance of, or the voltage drop U FET at the switch Sl is temperature-dependent and changes with increasing (and of course also at decreasing) temperature. This behavior can therefore be detected by the monitoring circuit.
- Switch resistance of, or the voltage drop U FE T to the switch Sl, which represents the temperature / temperature change at the switch Sl is then supplied as an electrical parameter of the monitoring circuit 11 and evaluated by them.
- a forward voltage U f of the secondary-side diode Dl is also determined. This is done by detecting an anode voltage U ATI on the anode side of the diode Dl and detecting a cathode voltage U Ka th on the cathode side of the diode Dl.
- the anode voltage ⁇ or the cathode voltage U Ka th is detected via a second voltage divider ST2 or a third voltage divider ST3.
- the second voltage divider ST2 is formed by the third resistor R3 and the fourth resistor R4.
- the third voltage divider ST3 is formed by the fifth resistor R5 and the sixth resistor R6.
- the anode voltage UA H can be detected by the monitoring circuit 11 via a second tap point PIN2, which is connected to the midpoint of the second voltage divider ST2. Accordingly, the cathode voltage U Ka th can be detected on the cathode side of the diode Dl via a third tap point PIN3, which is connected to the midpoint of the third voltage divider ST3.
- the anode voltage of the secondary-side diode D may alternatively be determined indirectly, namely, having regard to the supply voltage Ubus and the winding ratio of the primary side coil Ll ⁇ l to the secondary side coil 2 ⁇ Ll of the coupling element.
- the second voltage divider ST2 can then be omitted, while the forward voltage Uf can still be determined, however.
- the winding ratio is preferably stored or ascertainable in the monitoring circuit 11.
- the forward voltage Uf is also temperature-dependent and changes with increasing (and decreasing) temperature.
- the forward voltage U f is therefore evaluated as ei electrical parameters of the monitoring circuit 11, which reflects the temperature / temperature change at the diode Dl.
- the measurement of the switch resistance / voltage drop U FET and the determination of the forward voltage U f . take place at the same tapping point and thus via an input to the monitoring circuit 11, for example an ASIC, are supplied.
- the temperature can be determined in each case at the electronic switch S1, the diode D1, or both.
- the monitoring circuit 11 can detect electrical parameters, such as e.g. a voltage / current value, a resistance value, a voltage / current value change, a resistance value change and / or a result of a voltage / current value calculation.
- At least one threshold value for the determined temperature may be predetermined in the monitoring circuit 11, in the case of which the monitoring circuit 11 exceeds or falls below a measure which counteracts further heating of the circuit 10 or of the semiconductor components.
- at least one threshold value can be predetermined for each semiconductor component. Depending on the threshold reached and also on the semiconductor device for which it is achieved, then the appropriate measure can be selected.
- the monitoring circuit 11 can, for example, change, for example increase, a dimming level of the gas discharge lamp. Basically, the amount of energy transferred from the coupling element is reduced. Thus, it is achieved, inter alia, that a lower heating, ie a reduced transmission of heating energy from the primary side to the secondary side, may be required. By reducing the additional heating, a further heating of the circuit 10 and in particular a further heating of the semiconductor components is counteracted.
- the relationship between dimming level and degree of auxiliary heating for the filament is preferably stored in a table or in a function in the monitoring circuit 11 (eg an ASIC).
- the temperature at the semiconductor devices can also be determined directly from a temperature sensor, which is arranged in the vicinity of the coupling element or the components.
- the temperature detection determines temperature-indicating parameters from the environment of the circuit 10.
- the semiconductor components are admittedly less loaded overall, however, due to excessive heating, the semiconductor components of the circuit 10 are heavily loaded. In contrast to the other areas of the circuit 10 so here is a strong heating occur at low levels of dimming.
- this temperature sensor must be arranged around the region of the coupling element, and the flyback converter, and close to the semiconductor devices to specifically determine the temperature of the semiconductor devices.
- the secondary-side diode D1 which is monitored according to the invention, can also be replaced by a capacitor. This is much less at risk from elevated temperatures.
- a primary-side monitoring of the switch is necessary, the switch must be present at each case for the flyback converter.
- a flyback converter is just one example of a clocked floating heating circuit.
- Other heating circuit topologies can also be used.
- the monitoring circuit 11 may also be a part of the heating control circuit 13 or the control unit SE.
- the temperature-giving electrical parameters are in this case returned to the heating control circuit 13 and the control unit SE.
- Fig. 3 shows an example of a circuit according to another embodiment of the invention.
- the circuit 10 is now connected to a first filament Wl of a lamp LA instead of being connected to the equivalent resistor Rtn 1 .
- the heating control circuit 13 specifies desired values for the on-time T on and the frequency f of the switching operations of the electronic switch Sl. It can communicate bidirectionally with the monitoring circuit 11. Threshold values and setpoint values for temperatures can be specified for the monitoring circuit 11 by the heating control circuit 13 via the bidirectional communication channel 14.
- the heating control circuit 13 may receive, for example, via an interface 15 dimming commands, for example, according to the DALI standard.
- FIG. 3 also shows a calculation unit 12 which calculates the forward voltage U f from one of the anode voltage and cathode voltage U Kath . Alternatively, this calculation can also be performed by the monitoring circuit 11.
- the monitoring circuit 11 can also determine if the initiated countermeasures have no effect, ie the semiconductor components continue to heat despite the change in dimming level and thus also the degree of heating (which is indicated by a corresponding change in the temperature-giving electrical parameters or the temperature-giving electrical parameters will not change as a result of the countermeasures.
- the monitoring circuit 11 can transmit to the heating control circuit 13, for example, overheating information via the communication channel 14 to the heating control circuit 13.
- the heating control circuit 13 can switch the operating device (electronic ballast electronic ballast), for example, into an error mode or switch off via outgoing commands 16.
- the reaction of the heating control circuit 13 to the overheating information may depend on the current operating state of the operating device. Possible actions initiated by the heating control circuit 13 in the operating device are, for example, switching off the half-bridge inverter 20.
- the circuit 10 is used to heat a first filament Wl of a lamp LA.
- the forward voltage U f2 at a diode D 2 can then be measured analogously to the flux voltage U f at the diode D 1.
- a second calculation unit 12 ⁇ can be provided, which 'from a second anode voltage and a second cathode voltage, the forward voltage U f j. calculated. Alternatively, this calculation can also be done by the Calculation unit 12 or the monitoring circuit 11 done.
- FIGS. 4a and 4b show two alternative supply arrangements of the circuit 10 of FIG. 1.
- the primary side of the coupling element is determined from the midpoint voltage of FIG. 1
- Half-bridge inverter 20 (or a
- the primary side can also be supplied by a DC voltage supplying the half-bridge inverter 20, or by a DC link voltage provided by a PFC circuit 30 with a switch.
- 5 shows a diagram of an increase of the drain-source resistance ds_on of a semiconductor switch as a function of the temperature.
- the source channel resistance Rds_on increases with increasing temperature and the voltage drop U FE T increases when the semiconductor switch Sl is closed.
- the monitoring circuit 11 may raise the dimming level to 100% (no dimming), thereby turning off the heating circuit (the flyback converter).
- the voltage drop U FET at the electronic switch can, as already said, ' measured when the switch Sl is closed.
- Fig. 6 shows, in a U / l diagram for a diode (for example, the diode Dl or D2), the decrease a forward voltage U f a diode at different temperatures T j.
- the forward voltage U f of the diode (UAn-U Ka th) decreases with increasing temperature. For example, if Uf falls below a threshold value, the monitoring circuit 11 may For example, raise the dimming level to 100% (no dimming), turning off the heating circuit (the flyback converter).
- the U f can be as already stated, • determined when the electronic switch is open.
- the invention can be applied to all the primary side clocked and galvanically isolated coupling circuits in operating devices for lamps (eg., OLED, halogen or LED).
- lamps eg., OLED, halogen or LED.
- the invention to a coupling circuit, which transmits the main light output of the bulb ⁇ , the
- Monitoring circuit 11 preferably lower the dimming level to a lower brightness to reduce the amount of energy transmitted from the coupling element.
- the invention provides an operating device for lighting means, e.g. OLED, halogen lamps or LED, ready with a clocked supply circuit, comprising: a galvanically isolated and preferably actively timed by a switch coupling element is provided, which transfers energy from a powered primary side to a secondary side connected to a load to be fed is, wherein the coupling element on the primary side and / or secondary side has at least one semiconductor device as part of the feed circuit, and a monitoring circuit which is adapted to a temperature at the at least one semiconductor device indirectly, by means of an electrical parameter, and / or directly by means of a temperature sensor capture and depending on the detected temperature, the dimming level of the bulbs and directly or indirectly to change the transmitted power.
- a galvanically isolated and preferably actively timed by a switch coupling element is provided, which transfers energy from a powered primary side to a secondary side connected to a load to be fed is, wherein the coupling element on the primary side and / or secondary side has at least one semiconductor device as part of the
Landscapes
- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011085659A DE102011085659A1 (de) | 2011-11-03 | 2011-11-03 | Getaktete Heizschaltung für Betriebsgeräte für Leuchtmittel |
PCT/AT2012/000282 WO2013063633A2 (de) | 2011-11-03 | 2012-11-05 | Getaktete schaltung für betriebsgeräte für leuchtmittel |
Publications (2)
Publication Number | Publication Date |
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EP2774460A2 true EP2774460A2 (de) | 2014-09-10 |
EP2774460B1 EP2774460B1 (de) | 2019-01-09 |
Family
ID=48128765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12846161.3A Active EP2774460B1 (de) | 2011-11-03 | 2012-11-05 | Getaktete schaltung für betriebsgeräte für leuchtmittel |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2774460B1 (de) |
DE (2) | DE102011085659A1 (de) |
WO (1) | WO2013063633A2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT14557U1 (de) * | 2014-09-11 | 2016-01-15 | Tridonic Gmbh & Co Kg | Getaktete Sperrwandlerschaltung |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0428199A (ja) * | 1990-05-22 | 1992-01-30 | Nec Home Electron Ltd | インバータ照明装置 |
US5703441A (en) * | 1995-11-02 | 1997-12-30 | General Electric Company | Multi-function filament-heater power supply for an electronic ballast for long-life dimmerable lamps |
US5949197A (en) * | 1997-06-30 | 1999-09-07 | Everbrite, Inc. | Apparatus and method for dimming a gas discharge lamp |
US6445141B1 (en) * | 1998-07-01 | 2002-09-03 | Everbrite, Inc. | Power supply for gas discharge lamp |
DE19923945A1 (de) | 1999-05-25 | 2000-12-28 | Tridonic Bauelemente | Elektronisches Vorschaltgerät für mindestens eine Niederdruck-Entladungslampe |
ATE245337T1 (de) | 1999-05-25 | 2003-08-15 | Tridonicatco Gmbh & Co Kg | Elektronisches vorschaltgerät für mindestens eine niederdruck-entladungslampe |
DE10058529A1 (de) * | 2000-11-24 | 2002-05-29 | Bosch Gmbh Robert | Ansteuerungsverfahren für eine Lichtquelle |
AT412693B (de) * | 2002-09-20 | 2005-05-25 | Siemens Ag Oesterreich | Verfahren zum steuern des abschaltens bei überlastzuständen eines schaltnetzteils |
WO2006111163A1 (en) | 2005-04-21 | 2006-10-26 | Novozymes A/S | Plant extraction process |
DE102005018761A1 (de) | 2005-04-22 | 2006-10-26 | Tridonicatco Gmbh & Co. Kg | Intelligente Flyback-Heizung |
JP4929020B2 (ja) * | 2007-04-10 | 2012-05-09 | 矢崎総業株式会社 | 負荷回路の過電流保護装置 |
DE102007029123A1 (de) | 2007-06-25 | 2009-01-02 | Tridonicatco Schweiz Ag | System und Verfahren zur Erfassung der Kennlinien für eine Leuchtdioden-Anordnung |
JP2009055754A (ja) * | 2007-08-29 | 2009-03-12 | Yazaki Corp | 保護回路 |
SI23077A (sl) | 2009-06-03 | 2010-12-31 | Technoplast D.O.O. | Vezje za temperaturno krmiljenje led diode |
DE102009032028A1 (de) * | 2009-07-07 | 2011-01-13 | Tridonicatco Gmbh & Co. Kg | Verfahren zum Betrieb von Gasentladungslampen bei niedrigen Außentemperaturen und dafür ausgelegtes Betriebsgerät |
DE102010000939A1 (de) * | 2010-01-15 | 2011-07-21 | Tridonic Ag | Leuchtmittel-Betriebsgerät mit temperaturabhängiger Schutzschaltung |
US8159153B2 (en) | 2010-10-01 | 2012-04-17 | Bridgelux, Inc. | LED light sources with improved thermal compensation |
-
2011
- 2011-11-03 DE DE102011085659A patent/DE102011085659A1/de not_active Withdrawn
-
2012
- 2012-11-05 EP EP12846161.3A patent/EP2774460B1/de active Active
- 2012-11-05 WO PCT/AT2012/000282 patent/WO2013063633A2/de active Application Filing
- 2012-11-05 DE DE112012004615.3T patent/DE112012004615A5/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2013063633A3 * |
Also Published As
Publication number | Publication date |
---|---|
WO2013063633A3 (de) | 2014-06-05 |
DE112012004615A5 (de) | 2014-09-18 |
DE102011085659A1 (de) | 2013-05-08 |
EP2774460B1 (de) | 2019-01-09 |
WO2013063633A2 (de) | 2013-05-10 |
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