WO2011086153A2 - Luminous element operating device having a temperature-dependent protective circuit - Google Patents
Luminous element operating device having a temperature-dependent protective circuit Download PDFInfo
- Publication number
- WO2011086153A2 WO2011086153A2 PCT/EP2011/050454 EP2011050454W WO2011086153A2 WO 2011086153 A2 WO2011086153 A2 WO 2011086153A2 EP 2011050454 W EP2011050454 W EP 2011050454W WO 2011086153 A2 WO2011086153 A2 WO 2011086153A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transformer
- primary winding
- switch
- temperature
- winding
- Prior art date
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]
- H05B45/385—Switched mode power supply [SMPS] using flyback topology
-
- 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]
- H05B45/60—Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Definitions
- the present invention relates generally to the determination of the temperature of a transformer or other components, in particular power components, to initiate a safety measure, depending on the detected temperature, if necessary. Furthermore, the invention relates to a safety mechanism in a transformer or to a light source operating device or system and methods by means of which light sources such as light emitting diodes (LEDs), OLEDs, gas discharge lamps, can be operated.
- LEDs light emitting diodes
- OLEDs organic light emitting diodes
- gas discharge lamps can be operated.
- transformers are used to reduce an AC voltage of a network.
- SELV safety extra low voltage
- a circuit 20 is already known from the prior art, in which the temperature of a primary winding 21 of a transformer 23 via an external thermal sensor 24 is detected.
- the secondary winding 22 of the transformer 23 is connected inter alia to a diode 26, a capacitor 27 and a lighting means (not shown).
- the data acquired by the thermal sensor 24 are evaluated by a control unit 25. If the detected temperature of the transformer 23 rises above a certain value, a safety mechanism is triggered in which, for example, the supply voltage for the primary side is reduced.
- Illuminant in which a switch for clocked driving a primary winding of a transformer is provided.
- the method comprises the following steps:
- the method can have the following steps:
- the control unit may trigger a safety mechanism as soon as the temperature of the transformer reaches or exceeds a limit.
- the safety mechanism may be that the control unit reduces the electrical energy transmitted to the secondary winding.
- the electrical energy transferred to the secondary winding can be reduced in such a way that the switching on of the switch for charging the transformer is delayed.
- the electrical energy transferred to the secondary winding may be reduced such that the turn-on time of the transformer charging switch is shortened.
- the electrical energy transferred to the secondary winding can be reduced in such a way that a voltage available for supplying the primary winding is reduced.
- the safety mechanism may alternatively be that the control unit turns off the transformer.
- the transformer can be switched off if the safety mechanism is executed for a defined period of time without the temperature of the transformer falling below the limit again.
- the determined resistance of the material of the primary winding can be compared with a reference value which corresponds to a maximum permissible temperature of the transformer.
- a measuring unit for determining the resistance of the material of the primary winding can be provided.
- an additional switch may be designed such that it is switched on only during the determination of the resistance of the material of the primary winding by the measuring unit.
- an integrated control unit is proposed, in particular ASIC, microcontroller or hybrid thereof, which is designed to carry out a method as described above.
- an LED lamp comprising such a control unit.
- a power supply for consumers in particular light-emitting diodes or light-emitting diodes of an LED module, comprising
- a transformer having a primary winding and a secondary winding for transmitting a power to the consumer
- a switch for clocked driving of the transformer wherein the switch is arranged in series with the primary winding between the two inputs
- a control unit for determining the temperature of the transformer in dependence on the determined resistance of the material of the primary winding.
- the measuring unit can be a measuring resistor.
- the control unit may be designed to trigger a safety mechanism as soon as the specific temperature of the transformer reaches or exceeds a limit value.
- the safety mechanism may consist of the control unit reducing the electrical energy transmitted to the secondary winding or switching off the transformer.
- the power supply may include a memory for storing a reference value corresponding to a maximum permissible temperature of the transformer.
- the power supply may comprise a comparator unit for comparing the determined resistance of the material of the primary winding with the reference value stored in the memory.
- the power supply may comprise a conductive element in series with the primary winding and of a different material than the primary winding. According to another aspect of the invention, an LED lamp is proposed comprising such a power supply.
- a method for operating at least one consumer, in particular a luminous means or a light emitting diode (LED) of an LED module, in which a switch is designed for clocked driving of a primary winding of a transformer.
- the primary winding and / or a secondary winding of the transformer can be electrically insulated with an insulating material.
- a temperature sensor (75) for determining the temperature of the transformer ( ⁇ 1) may be provided within the insulating material (73, 74).
- a power supply for consumers, in particular lamps or light-emitting diodes of an LED module is proposed.
- the power supply may have
- a transformer having a primary winding and a secondary winding for transmitting a power to the load, wherein the primary winding and / or a secondary winding of the transformer is electrically insulated with an insulating material
- a switch for clocked driving of the transformer wherein the switch is arranged in series with the primary winding between the two inputs, and
- an LED lamp having such a power supply.
- the invention is advantageous because the better determination of the temperature of the transformer can improve the safety mechanism in the transformer.
- the safety mechanism of a transformer in a light bulb operating device or system and method can be improved.
- the invention is advantageous because the use of temperature characteristic of the coil winding material (in particular copper)
- the invention is advantageous because the use of a temperature sensor within the isolation of Spulential. Winding material improves the temperature determination.
- the invention is particularly advantageous in a SELV supply, since in such applications, the transformer or transmitter represents the central security element.
- the improved temperature determination of the transformer can ensure that the materials used in the transformer, such as insulators, wires, etc., are operated within a safe temperature range. It can thus ensuring that a maximum temperature of the transformer is not exceeded.
- the invention is advantageous, as it allows imperceptibly or in a flyback converter to determine the temperature of the transformer via copper resistance changes. Thus, a safe operation is ensured without that the operation of the switching regulator is significantly affected.
- FIG. 2 shows a schematic illustration of an illumination system according to the invention having an operating circuit and a light-emitting diode (LED) module.
- FIG. 3 shows a schematic illustration of a further embodiment of the operating circuit according to the invention .
- 4 shows a schematic representation of a further embodiment of the operating circuit according to the invention
- 5 shows a representation of the time profile of the switching on and off of the transformer, and the amplitude of the primary-side or secondary-side current
- Fig. 6 shows a schematic representation of another embodiment of the operating circuit according to the invention.
- Fig. 7 is a schematic representation of another embodiment according to the invention with an insulated transformer.
- FIG. 2 shows a schematic illustration of a lighting system 1 according to the invention comprising an operating circuit 10 and a light-emitting diode (LED) module 7.
- LED light-emitting diode
- the operating circuit 10 is connected to the AC voltage network 2 and supplies the LED module 7 with a constant direct current.
- the operating circuit 10 consists of a DC voltage source 9 supplied by the AC mains with alternating voltage, which provides a constant direct current voltage of approximately 12 to 24 V at its output.
- the output voltage of the DC voltage source 9 is preferably a Niedervoltt. Low voltage, which is particularly suitable for operating light sources such as LEDs.
- a light source converter 6 is supplied, which in turn forms a constant current source for operating the LED module 7.
- the generated by the light bulb converter 6 DC power is used to power the LED module 7.
- the LED module 7 preferably consists of a plurality of light-emitting diode LEDs 8, which are combined by parallel and / or series connection.
- the LED module 7 directly from the reduced voltage, which is generated at the output of a switching converter or voltage converter 5, are supplied. In this case, it is possible to dispense with the additional lamp converter 6.
- the operating circuit 10 according to FIG. 1 can drive an LED module via a corresponding channel 11.
- an operating circuit according to the invention can also control a plurality of channels independently of one another.
- Each channel can control an LED module. These may be, for example, LED modules with blue LEDs that emit white light using a color conversion agent. It is also possible that each channel drives a different LED color.
- the method according to the invention or the operating circuit 10 according to the invention can incorporate several channels. For three channels it is e.g. It is conceivable that one channel controls red LEDs, one channel green LEDs and one channel blue LEDs.
- the DC voltage source 9 preferably contains an input filter circuit 3 for filtering the mains voltage and a rectifier 4, for example a bridge rectifier, which rectifies the mains voltage. The rectified mains voltage is then lowered in the voltage converter or switching converter 5 in its voltage value to about 12 to 24 volts.
- a switching regulator such as a flyback converter or a buck converter.
- FIG. 3 shows a detailed schematic representation of a circuit 30 according to the invention for an operating device.
- the circuit 30 includes a switching converter or voltage converter in the form of a flyback converter 33, also called flyback converter. Instead of a flyback converter, the circuit 30 may also have another switching converter or switching power supply, such as, for example, a forward converter.
- the flyback converter 33 is preferably connected after the series connection of input filter circuit 3 and rectifier 4 shown in FIG.
- the voltage provided by the rectifier 4 serves as the input voltage VIN of the flyback converter 33.
- the network-side elements such as input filter circuit 3 and rectifier 4 are optional.
- the input voltage is smoothed by a capacitor 38.
- flyback converter 33 it is provided to supply the converter 33 with a DC voltage starting from a battery (not shown).
- the flyback converter 33 has two inputs 42, 43 for power consumption, the input voltage VIN being applied between these two inputs.
- the flyback converter also has a transformer T1.
- the transformer Tl comprises a primary winding or main winding 31 and a secondary winding 32.
- the current ip through the primary winding 31 can be controlled by a switch S1.
- the switch Sl is preferably a transistor and in particular a bipolar transistor or
- the switch S1 is controlled by a control unit 37 such that a desired output voltage VOUT or a desired output current IOUT for operating, for example, the LEDs 8 is generated on the secondary side.
- the control of the switch Sl to control the flyback converter 33 can be performed by a known method, such as. By means of pulse width modulation (PWM) control.
- PWM pulse width modulation
- the switch Sl is turned off by the control unit 37.
- the primary current ip drops immediately to the value zero.
- the stored by magnetic coupling between primary 31 and secondary winding 32 Energy discharges on the secondary side via a capacitor 35, which is connected in parallel to the secondary winding. As a result, a secondary current is generated.
- a measuring resistor 36 is provided in the flyback converter 33.
- This measuring resistor 36 which is designed, for example, as a high-impedance shunt, is connected in parallel to the switch S1 according to the embodiment shown in FIG.
- This measuring resistor 36 is used according to the invention to determine the resistance of the material of the primary winding, for example copper, in the flyback converter 33. Since the temperature characteristic of the winding material and in particular the function of its temperature in dependence on its resistance are known, this resistance measurement is used to determine the temperature of the transformer Tl.
- the ohmic resistance measurement in particular the primary-side winding 31 of the Transformer Tl then take place when the primary current switch S1 is open, the current through the windings has dropped to zero.
- VIN input voltage
- a current flows through the measuring resistor 36.
- This current causes a proportional to him voltage drop, which is measured by the control unit 37. From this, the control unit 37 determines or calculates the current ohmic resistance value Rm of the primary-side winding 31.
- the resistance measurement can also be carried out on the secondary side, so that the current ohmic resistance of the secondary winding 32 is determined.
- a memory 39 and a comparator 40 are also provided.
- the memory 39 and the comparator 40 are preferably parts of the control unit 37.
- the memory 39 stores a reference value Rref, which is compared by the comparator 40 with the determined resistance Rm. It is thus compared whether the measured resistance Rm of the winding 31 changes beyond the predetermined reference value Rref, in particular has risen.
- the resistivity increases with increasing temperature.
- the reference value Rref which is stored in the memory 39, thus preferably corresponds to the maximum permissible temperature Tmax of the transformer Tl.
- an absolute shutdown threshold for the used ohmic resistance ie, for example, during production is programmed into the device, which ohmic resistance value corresponds to the Temperaturabschaltschwelle.
- the invention provides, in particular, that the control unit 37 utilizes this measurement signal, which reflects the resistance Rm of the primary winding 31, and can trigger the safety mechanism in dependence thereon.
- the transmitted power of the transformer T1 can be reduced, for example, by delayed switching on of the primary-side switch S1, or by a shorter turn-on of the primary-side switch S1. Switching on the switch S1 for a shorter time reduces the switch-on time duration ton.
- the input or supply voltage Vin for the primary side can be reduced.
- the complete shutdown of the transformer Tl is also provided. This shutdown can be done via the switch Sl or another switch.
- the reduced power can be used in the defined period of time, if this mechanism does not lead to the solution of the temperature problem, then the complete shutdown of the transformer Tl can be done.
- signals perceivable by a user can also be output as a security measure.
- optical and / or acoustic signals can be output by means of at least one optical and / or acoustic signal unit 41.
- FIG. 4 shows a schematic representation of a further embodiment of a circuit 30 .lamda . According to the invention for an operating device. The structure and operation of the circuit 30 ⁇ is similar to the circuit 30 shown in FIG. 3.
- the circuit 30 differs from the embodiment described above in that the
- an additional switch S2 is provided, with which a voltage, be it the supply voltage Vin or a separate voltage, is temporarily switched via the primary-side winding 31, in order to measure the ohmic resistance value Rm at this time ,
- the additional switch S2 which is preferably connected in series with the measuring resistor, preferably only switched on when the resistance of the primary winding 31 are determined should.
- the additional switch S2 is in particular only switched on when the transformer Tl is demagnetized or when the currents through the primary winding 31 and through the secondary winding 32 are equal to zero.
- Fig. 6 shows an alternative embodiment of the present invention. Since the temperature response of the copper material typically used is not very large in the case of the usual temperature changes, the circuits shown in FIG. 3 or 4 can be supplemented with an additional conductive element 60.
- this additional conductive element 60 preferably has a higher temperature response than the material used for the transformer windings.
- the conductive element 60 is preferably made of a different material than the windings, and may in particular be connected in series with the primary 31 and secondary winding 32, respectively.
- a reference value Rref x is then stored, which reflects the resistance of the ensemble winding plus conductive element 60 at the highest permissible temperature Tmax.
- Fig. 7 shows another embodiment of the present invention.
- the circuit 70 has no measuring resistor 36 for better determination of the temperature of the transformer.
- the transformer has a primary winding 71 and a secondary winding 72, wherein at least one of the two windings is surrounded by an insulation 73, 74.
- the safety mechanism is improved over the prior art such that a thermal sensor 75, although separate from the actual coil winding 71, 72, but within the insulating material 73, 74 is provided.
- the operation of this circuit 70 is similar to that of the embodiments described above, in particular, the data of the thermal sensor 75 of the control unit 37 are supplied.
- This embodiment represents an improvement in temperature over known circuits in which the thermal sensor is provided outside the transformer T1 and outside the insulation.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
- Led Devices (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112011100245.9T DE112011100245B4 (en) | 2010-01-15 | 2011-01-14 | Lamp operating device with temperature-dependent protection circuit |
EP11701772A EP2548274A2 (en) | 2010-01-15 | 2011-01-14 | Luminous element operating device having a temperature-dependent protective circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010000939A DE102010000939A1 (en) | 2010-01-15 | 2010-01-15 | Lamp operating device with temperature-dependent protection circuit |
DE102010000939.3 | 2010-01-15 |
Publications (3)
Publication Number | Publication Date |
---|---|
WO2011086153A2 true WO2011086153A2 (en) | 2011-07-21 |
WO2011086153A3 WO2011086153A3 (en) | 2012-01-26 |
WO2011086153A9 WO2011086153A9 (en) | 2012-05-03 |
Family
ID=44304724
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2011/050454 WO2011086153A2 (en) | 2010-01-15 | 2011-01-14 | Luminous element operating device having a temperature-dependent protective circuit |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2548274A2 (en) |
DE (2) | DE102010000939A1 (en) |
WO (1) | WO2011086153A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI665853B (en) * | 2014-01-27 | 2019-07-11 | 南韓商Ap系統股份有限公司 | Power conversion apparatus |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011085659A1 (en) * | 2011-11-03 | 2013-05-08 | Tridonic Gmbh & Co. Kg | Clocked heating circuit for control gear for lamps |
CN117999855A (en) * | 2021-08-10 | 2024-05-07 | 赤多尼科两合股份有限公司 | Power supply circuit, driver, and control method |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE933350C (en) * | 1951-10-16 | 1955-11-17 | Deutsche Bundesbahn | Device for continuous measurement of the winding temperatures of transformers, reactors and electrical machines during operation |
DE1008401B (en) * | 1953-10-15 | 1957-05-16 | Licentia Gmbh | Device for measuring and monitoring the aging phenomena on the windings of transformers or machines by means of temperature monitoring |
US4210947A (en) * | 1977-10-06 | 1980-07-01 | Sony Corporation | Protective circuit for a switching regulator |
GB2049315A (en) * | 1979-04-11 | 1980-12-17 | Borrfors E | Electronically controlled electric arc-welding |
DE3023740C2 (en) * | 1980-06-25 | 1982-04-08 | Saba Gmbh, 7730 Villingen-Schwenningen | Device for protecting a network transformer |
JPH0534773A (en) * | 1991-07-30 | 1993-02-12 | Nikon Corp | Heat generation detection device for electronic flashing device |
JPH09285113A (en) * | 1996-04-10 | 1997-10-31 | Tohoku Ricoh Co Ltd | Dc-dc converter |
JP2007330086A (en) * | 2006-06-09 | 2007-12-20 | Oki Power Tech Co Ltd | Magnetic device, and switching power supply circuit using same, and its controlling method |
-
2010
- 2010-01-15 DE DE102010000939A patent/DE102010000939A1/en not_active Withdrawn
-
2011
- 2011-01-14 WO PCT/EP2011/050454 patent/WO2011086153A2/en active Application Filing
- 2011-01-14 DE DE112011100245.9T patent/DE112011100245B4/en not_active Expired - Fee Related
- 2011-01-14 EP EP11701772A patent/EP2548274A2/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
None |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI665853B (en) * | 2014-01-27 | 2019-07-11 | 南韓商Ap系統股份有限公司 | Power conversion apparatus |
Also Published As
Publication number | Publication date |
---|---|
DE112011100245A5 (en) | 2012-10-25 |
EP2548274A2 (en) | 2013-01-23 |
DE112011100245B4 (en) | 2019-01-10 |
WO2011086153A9 (en) | 2012-05-03 |
WO2011086153A3 (en) | 2012-01-26 |
DE102010000939A1 (en) | 2011-07-21 |
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