GB2570452A - Ripple-suppressing operating device for at least one LED - Google Patents
Ripple-suppressing operating device for at least one LED Download PDFInfo
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- GB2570452A GB2570452A GB1801135.3A GB201801135A GB2570452A GB 2570452 A GB2570452 A GB 2570452A GB 201801135 A GB201801135 A GB 201801135A GB 2570452 A GB2570452 A GB 2570452A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/285—Single converters with a plurality of output stages connected in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/385—Switched mode power supply [SMPS] using flyback topology
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0043—Converters switched with a phase shift, i.e. interleaved
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
- H02M3/1586—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
An operating device 10 for at least one LED 27 comprises first and second converters 20, 30, such as flyback converters, for current supply of the at least one LED; and a charge storage means 29 for energizing the second converter 30. The first converter 20 comprises an auxiliary winding or choke 21C for energizing the charge storage means. The second converter may be driven in antiphase with the first converter to accomplish ripple suppression in the current supplied to the at least one LED.
Description
Ripple-suppressing operating device for at least one LED
FIELD OF THE INVENTION
Various embodiments of the invention relate to an operating device for at least one LED, and in particular to an operating device capable of suppressing ripple in a load current of the at least one LED.
BACKGROUND OF THE INVENTION
Single-stage operating devices for LED modules, in particular flyback designs, usually need to cope with requirements as regards power factor, total harmonic distortion, and equally ripple performance. Typically, some compromise between input or output performance and cost is chosen, which in turn requires a high-capacity 15 output filter.
BRIEF SUMMARY OF THE INVENTION
In view of the above, there is a continued need in the art for an operating device 20 for at least one LED which addresses some of the above needs.
These underlying objects of the invention are each solved by an operating device for at least one LED as defined by the independent claim. Preferred embodiments of the invention are set forth in the dependent claims.
An operating device for at least one LED is provided. The operating device comprises first and second converters for current supply of the at least one LED; and a charge storage means for energizing the second converter. The first converter comprises an auxiliary choke for energizing the charge storage means.
Advantageously, designs of operating devices already having a direct low-voltage (DC) supply based on auxiliary choke and charge storage means elements may easily be enhanced by a second converter for ripple suppression. As a result, a ripple-suppression specification close to two-stage converters may be achieved, 35 using only a single-stage design.
Advantageously, such single-stage designs may also be used to overcome shortterm interruptions in mains supply, in particular when additionally dimming the at least one LED during such short-term interruptions.
The term “operating device” as used herein may refer to electronic circuits and assemblies which condition and provide electrical energy for LED modules.
The term “LED” as used herein may refer to light emitting diodes. A plurality of LEDs may be consolidated as an LED module.
The term “converter” as used herein may refer to electronic circuits and assemblies which convert electrical energy between different combinations of voltage and current levels.
The term “energizing” as used herein may refer to supplying an average electrical voltage, an average electrical current, or an average electrical power, i.e. the product of average electrical voltage and current.
The term “choke” as used herein may refer to a passive two-terminal electrical 20 component that stores/retrieves electrical energy in/from a magnetic field. For example, a choke may be realized as a coil having a number N of windings which may be traversed by a magnetic flux.
Output currents of the first and second converters may sum up to a load current of 25 the at least one LED.
The term “load current” as used herein may refer to a total output current of the operating device serving as the load current of the at least one LED.
The output currents of the first and second converters may sum up to a substantially constant load current of the at least one LED.
Advantageously, a substantially constant load current may ensure compliance with a given ripple performance of the operating device.
The term “substantially constant” as used herein may refer to a circumstance in which an instantaneous value of an electrical quantity shows no deviation from an average value of the electrical quantity in excess of a threshold deviation. The threshold deviation may, for example, be defined as an absolute value, or as a relative value. If defined as a relative value, the threshold deviation may, in particular, be defined as a percentage of the average value.
The operating device may further comprise a regulating means for regulating the output current of the second converter in antiphase to the output current of the first converter.
The term “regulating means” as used herein may refer to a microcontroller or an application-specific integrated circuit (ASIC) capable of controlling the first and second converters of the operating device, in particular by providing corresponding control signals to respective switching means of the first and second converters.
The term “in antiphase” as used herein may refer to a circumstance in which the first converter supplies an output current of substantially constant level which is disrupted by negative excursions in excess of the threshold deviation, and the second converter joins in with an output current having positive excursions corresponding to the negative excursions in order to cancel the negative excursions.
The auxiliary choke may be arranged at an input side of the operating device.
The term “input side as used herein may refer to a supply side or primary side of the operating device.
The auxiliary choke may be arranged at an output side of the operating device.
The term “output side” as used herein may refer to a load side or secondary side of the operating device.
Advantageously, arranging the auxiliary choke at a side of the operating device where a direct low-voltage supply is already disposed avoids a signal transfer from one side to the other, which may result in a simpler electrical circuit.
The second converter may be adapted to supply a fraction of a total power supplied to the at least one LED.
The second converter may be adapted to supply 10% or less of the total power supplied to the at least one LED.
Advantageously, a small power rating of the second converter with respect to the 5 first converter may result in a small form factor of the second converter with respect to the first converter.
The second converter may be a non-isolating converter.
Advantageously, a non-isolating converter design of the second converter may result in a small form factor of the second converter with respect to the first (isolating) converter, as no transformer is deployed, Additionally, heat waste may be reduced, which may result in a high operating efficiency of the second converter.
The term “non-isolating” as used herein may refer to a converter not providing any galvanic isolation between its input and output sides.
The second converter may be an isolating converter.
The term “isolating” as used herein may refer to a converter providing a galvanic isolation between its input and output sides. For example, galvanic isolation between input and output sides of a converter may be achieved using magnetic coupling.
The second converter may be a flyback converter,
The term flyback converter” as used herein may refer to a particular converter design providing galvanic isolation between its input and output sides by means of a transformer, which implements the magnetic coupling.
The first converter may be a single-stage converter.
The term “single-stage converter as used herein may refer to a particular converter design involving only a single conversion step between different combinations of 35 voltage and current levels at its input and output, respectively, without using any intermediate voltage and current levels.
The first converter may be a flyback converter.
The charge storage means may be a capacitor.
The term “capacitor as used herein may refer to a passive two-terminal electrical component that stores/retrieves electrical energy in/from an electric field.
An output filter capacitor of the operating device may have a capacity of 1mF or less.
Advantageously, ripple suppression based on the proposed operation device improves smoothness of the load current of the operating device and thus reduces the required capacity of the deployed output filter capacitor. As a result, a form factor of the output filter capacitor may be reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention will be described with reference to the accompanying drawings, in which the same or similar reference numerals designate the same 20 or similar elements.
Fig. 1 is a schematic diagram of an operating device according to an embodiment.
Fig. 2 is another schematic diagram illustrating first and second output currents 15, 25 16 of the operating device being provided in antiphase to each other.
DETAILED DESCRIPTION OF EMBODIMENTS
Exemplary embodiments of the invention will now be described with reference to 30 the drawings. While some embodiments will be described in the context of specific fields of application, the embodiments are not limited to this field of application. Further, the features of the various embodiments may be combined with each other unless specifically stated otherwise.
The drawings are to be regarded as being schematic representations and elements illustrated in the drawings are not necessarily shown to scale. Rather, the various elements are represented such that their function and general purpose become apparent to a person skilled in the art.
Fig. 1 is a schematic diagram of an operating device 10 according to an embodi5 ment.
The operating device 10 for the at least one LED 27 comprises first and second converters 20, 30 for current supply of the at least one LED 27.
The first converter 20 is a single-stage converter, in particular a flyback converter as shown in Fig. 1.
An input side of the first converter 20 comprises first input choke 21 A, first switching means 22 being realized as a transistor, rectifying means 25, and a first shunt re15 sistor facilitating measurement of a first input choke current 12 at the input side of the first converter 20.
A mains voltage 24 supplied at the input of the first converter 20 is rectified by the rectifying means 25, induces a first magnetic flux through the first input choke 21A according to a given duty cycle of the first switching means 22 imparted by a first control signal 11, and gives rise to the afore-mentioned first input choke current 12 at the input side of the first converter 20. The first control signal 11 may be provided by a regulating means (not shown) as described above.
An output side of the first converter 20 comprises a first output choke 21B, a first output diode 23 and an output filter capacitor 26, which may, for example, have a capacity of 1mF or less. The first output choke 21B taps the first magnetic flux induced by the first input choke 21A, and depending on an instantaneous value of the first magnetic flux, the first output diode 23 selectively permits flux of a first output current 15 to the output filter capacitor 26. The first output current 15 depends on the first input choke current 12 as well as on a winding ratio N21B / N21A of the involved first output and input chokes 21B, 21A.
The input side of the first converter 20 further comprises an auxiliary diode 28, a charge storage means 29, which is realized as a capacitor, for energizing the second converter 30, and an auxiliary choke 21C for energizing the charge storage means 29. Alternatively, the auxiliary choke 21C may also be arranged at an output side of the operating device 10. The auxiliary choke 21C also taps the first magnetic flux induced by input choke 21 A, and depending on the instantaneous value of the first magnetic flux, the auxiliary diode 28 selectively permits flux of a supply current to the charge storage means 29 which may, for example, serve for direct low-volt5 age (DC) supply of the regulating means (not shown).
The second converter 30 depicted in Fig. 1 is an isolating converter realized as a flyback converter. Alternatively, the second converter 30 may also be realized as a non-isolating converter.
An input side of the second converter 30 comprises second input choke 31 A, second switching means 32 being realized as a transistor, and a second shunt resistor facilitating measurement of a second input choke current 14 at the input side of the second converter 30.
The direct low voltage provided by charge storage means 29 is supplied to the input of the second converter 30. This induces a second magnetic flux through second input choke 21A according to a variable duty cycle of second switching means 32 imparted by a control signal 13, and gives rise to the afore-mentioned 20 second input choke current 14 at the input side of the first converter 20. The control signal 13 may also be provided by the regulating means (not shown) and is similar to a control signal of a power factor correction (RFC) circuit in that it enforces a desired shape of the second input choke current 14 overtime.
An output side of the second converter 30 comprises a second output choke 31B, and a second output diode 33. The second output choke 31B taps the second magnetic flux induced by the second input choke 31A, and depending on an instantaneous value of the second magnetic flux, the second output diode 23 selectively permits flux of a second output current 16 to the output filter capacitor 26.
The second output current 16 depends on the second input choke current 14 as well as on a winding ratio Nsib / N31A of the involved second output and input chokes 31B, 31A.
The second converter 30 is adapted to supply a fraction of a total power supplied 35 to the at least one LED 27 by the operating device 10. In particular, the second converter 30 is adapted to supply 10% or less of the total power supplied to the at least one LED 27.
The first and second output currents 15, 16 of the first and second converters 20, 30 sum up to a total load current of the at least one LED 27. In particular, the first and second output currents 15, 16 of the first and second converters 20, 30 sum 5 up to a substantially constant total load current of the at least one LED 27, as will be further illustrated in connection with Fig. 2 below.
Fig. 2 is another schematic diagram illustrating the first and second output currents 15, 16 of the operating device 10 being provided in antiphase to each other.
The curve of the first output current 15 plotted in Fig. 2 comprises portions of substantially constant current disrupted by negative excursions in excess of a threshold excursion. The negative excursions result from gaps, or zero crossings, in the rectified mains voltage 24 supplied at the input of the first converter 20, as is indi15 cated by a train of half-waves framing the curve of the first output current 15.
By contrast, the curve of the second output current 16 comprises portions without any current flux disrupted by positive excursions which complement the negative excursions of the first output current 15.
Given the first and second input choke currents 12, 14 and the above-mentioned constant winding ratios, the regulating means (not shown) which provides the control signals 11, 13 for the first and second switching means 22, 32 is adapted for regulation of the second output current 16 of the second converter 30 in antiphase 25 to the first output current 15 of the first converter 20, so that the first and second output currents 15, 16 of the first and second converters 20, 30 sum up to a substantially constant load current of the at least one LED 27.
While operating devices for at least one LED according to various embodiments 30 have been described, various modifications may be implemented in other embodiments.
Claims (15)
1. Operating device (10) for at ieast one LED (27), comprising:
first and second converters (20, 30) for current supply of the at least one 5 LED (27); and a charge storage means (29) for energizing the second converter (30); wherein the first converter (20) comprises an auxiliary choke (21C) for energizing the charge storage means (29).
10
2. The operating device (10) of claim 1, wherein output currents (15, 16) of the first and second converters (20, 30) sum up to a load current of the at ieast one LED (27).
3. The operating device (10) of claim 2, wherein the output currents (15, 16) of 15 the first and second converters (20, 30) sum up to a substantially constant load current of the at least one LED (27).
4. The operating device (10) of claim 3, further comprising a regulating means for regulating the output current (16) of the second converter (30) in antiphase to
20 the output current (15) of the first converter (20).
5. The operating device (10) of any one of claims 1--4, wherein the auxiliary choke (21C) is arranged at an input side of the operating device (10).
25
6. The operating device (10) of any one of claims 1 - 4, wherein the auxiliary choke (21C) is arranged at an output side of the operating device (10)
7. The operating device (10) of any one of the preceding claims, wherein the second converter (30) is adapted to supply a fraction of a total power supplied to
30 the at least one LED (27).
8. The operating device (10) of claim 7, wherein the second converter (30) is adapted to supply 10% or less of the total power supplied to the at ieast one LED (27).
9. The operating device (10) of any one of claims 1-8, wherein the second converter (30) is a non-isolating converter.
10. The operating device (10) of any one of ciaims 1 - 8, wherein the second converter (30) is an isolating converter.
5
11. The operating device (10) of claim 10, wherein the second converter (30) is a flyback converter.
12. The operating device (10) of any one of the preceding ciaims, wherein the first converter (20) is a single-stage converter.
13. The operating device (10) of any one of the preceding claims, wherein the first converter (20) is a flyback converter.
14. The operating device (10) of any one of the preceding claims, wherein the 15 charge storage means (29) is a capacitor.
15. The operating device (10) of any one of the preceding claims, wherein an output filter capacitor (26) of the operating device (10) has a capacity of 1mF or iess.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1801135.3A GB2570452B (en) | 2018-01-24 | 2018-01-24 | Ripple-suppressing operating device for at least one LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1801135.3A GB2570452B (en) | 2018-01-24 | 2018-01-24 | Ripple-suppressing operating device for at least one LED |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201801135D0 GB201801135D0 (en) | 2018-03-07 |
| GB2570452A true GB2570452A (en) | 2019-07-31 |
| GB2570452B GB2570452B (en) | 2022-04-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1801135.3A Active GB2570452B (en) | 2018-01-24 | 2018-01-24 | Ripple-suppressing operating device for at least one LED |
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| Country | Link |
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| GB (1) | GB2570452B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11729883B1 (en) * | 2021-08-30 | 2023-08-15 | Universal Lighting Technologies, Inc. | LED driver with auxiliary output and low standby power |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013056356A1 (en) * | 2011-10-17 | 2013-04-25 | Queen's University At Kingston | Ripple cancellation converter with high power factor |
| WO2015135073A1 (en) * | 2014-03-14 | 2015-09-17 | Queen's University At Kingston | Primary side controlled led driver with ripple cancellation |
| WO2016033681A1 (en) * | 2014-09-05 | 2016-03-10 | Queen's University At Kingston | Energy channelling single stage power converter |
| US20170251535A1 (en) * | 2016-02-26 | 2017-08-31 | Silergy Semiconductor Technology (Hangzhou) Ltd | Dimming circuit, control circuit and dimming method |
-
2018
- 2018-01-24 GB GB1801135.3A patent/GB2570452B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013056356A1 (en) * | 2011-10-17 | 2013-04-25 | Queen's University At Kingston | Ripple cancellation converter with high power factor |
| WO2015135073A1 (en) * | 2014-03-14 | 2015-09-17 | Queen's University At Kingston | Primary side controlled led driver with ripple cancellation |
| WO2016033681A1 (en) * | 2014-09-05 | 2016-03-10 | Queen's University At Kingston | Energy channelling single stage power converter |
| US20170251535A1 (en) * | 2016-02-26 | 2017-08-31 | Silergy Semiconductor Technology (Hangzhou) Ltd | Dimming circuit, control circuit and dimming method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11729883B1 (en) * | 2021-08-30 | 2023-08-15 | Universal Lighting Technologies, Inc. | LED driver with auxiliary output and low standby power |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2570452B (en) | 2022-04-06 |
| GB201801135D0 (en) | 2018-03-07 |
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