EP2335459A2 - Schaltung und verfahren zum dimmen eines leuchtmittels - Google Patents
Schaltung und verfahren zum dimmen eines leuchtmittelsInfo
- Publication number
- EP2335459A2 EP2335459A2 EP08875143A EP08875143A EP2335459A2 EP 2335459 A2 EP2335459 A2 EP 2335459A2 EP 08875143 A EP08875143 A EP 08875143A EP 08875143 A EP08875143 A EP 08875143A EP 2335459 A2 EP2335459 A2 EP 2335459A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- terminal
- voltage
- switching
- circuit
- dimming
- 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
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000001419 dependent effect Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 description 19
- 238000004804 winding Methods 0.000 description 9
- 238000011161 development Methods 0.000 description 7
- 230000018109 developmental process Effects 0.000 description 7
- 238000013459 approach Methods 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000873 masking effect Effects 0.000 description 2
- 238000012549 training Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000011045 prefiltration Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
-
- 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
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/40—Controlling the intensity of light discontinuously
-
- 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
-
- 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
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/40—Controlling the intensity of light discontinuously
- H05B41/42—Controlling the intensity of light discontinuously in two steps only
Definitions
- the invention relates to a circuit and a method for dimming a lamp.
- Another dimming method is the so-called three-step dimming, which has found widespread use especially in the NAFTA area.
- Two operating devices are used in one luminaire. Usually operates the first operating device a light source, the second operating device operates two bulbs. The bulbs all have a comparable performance.
- the luminaire is controlled with two phases. Depending on which phase is switched on, three dimming levels can be realized, the operating devices are either controlled individually or together. If only the first operating device is operated, a light illuminates. If only the second operating device is operated, two lamps light up and both operating devices are activated, all three lamps light up. With lamps of the same power, these dimming levels allow brightness levels of approx. 33%, 66% and 100%. With two operating devices, this variant is very expensive and requires considerable installation effort.
- the object of the invention is to avoid the disadvantages mentioned above and in particular to provide an efficient and cost-effective way of dimming a light source. This object is achieved according to the features of the independent claims. Further developments of the invention will become apparent from the dependent claims.
- a circuit for dimming at least one light source
- the at least one lighting means is dimmable
- the at least one lamp is dimmable.
- the voltage waveform of the N terminal allows it to mask the dimming functionality, i. the dimming is possible in particular when the voltage curve to the N-terminal meets a predetermined condition.
- a phase angle between the signals at the switching inputs can be efficiently taken into account and thus the different switching combinations or switching states can be identified.
- the N-terminal is a pole of an AC voltage, while the other pole of the AC voltage is connectable to the switching inputs. It should be noted that the N-terminal may be any pole of an AC voltage.
- dimming may include a change in the direction of increasing or decreasing brightness.
- the at least one lamp is dimmable provided the voltage at the N- Terminal is substantially zero or substantially negative to a ground of the circuit (or a ground potential of the circuit, also referred to as "Ground" GND).
- the present approach enables efficient masking of the switching inputs. This advantageously avoids interference and influences of X capacitors and external loads on the L terminals.
- Each switching input can be connected to a terminal or a pole of the mains voltage (in particular a so-called L connection of the mains voltage) via a switch.
- a mains voltage is provided with an L-terminal and with an N-terminal, wherein the L-terminal of the mains voltage is connected to the at least two switching inputs.
- a desired value can be determined for setting a lamp control.
- a microcontroller is provided for determining the desired value and for setting the lamp control.
- Microcontroller determines whether the voltage at the N-terminal is substantially zero or substantially negative with respect to an internal ground of the circuit.
- the masking functionality described above can be implemented using the microcontroller.
- the switching inputs can be executed decoupled from the setpoint.
- One embodiment is that a change in the switching combination is largely free of overshoot.
- An alternative embodiment is that a threshold value comparison can be carried out for each switching input.
- a next embodiment is that a filter is provided for the reduction of power-frequency modulations.
- Switching combinations of the switching inputs are associated with predetermined brightness of the at least one light source.
- a connection can be, for example, that predetermined values (eg as a value table) are stored or that a circuit (eg by means of voltage divider) is parameterized such that predetermined values or signals to a
- Lamp control for adjusting the brightness of the at least one light source can be generated.
- a development consists in that the circuit comprises or is a circuit of an electronic ballast or an extension of a circuit of an electronic ballast.
- the above object is also achieved by a method for dimming at least one light source,
- the at least one lighting means is dimmed
- the at least one light source is dimmed.
- An embodiment is that, depending on the voltage profile at the N terminal, the at least one lighting means is dimmed when the voltage at the N terminal is dimmed.
- Terminal is substantially zero or substantially negative to an internal ground of the circuit.
- Another embodiment is that based on the switching combination of the switching inputs, a desired value is determined and depending on the determined setpoint brightness of the at least one light source is set.
- a lamp, luminaire or a lighting system comprising a circuit as described herein.
- Fig.l a circuit example of an electronic ballast with a dimming functionality
- a voltage curve of the mains voltage (voltage waveform between the terminals L and N) and a voltage waveform between the terminals L and the ground GND;
- FIG 3 shows the voltage curve of the mains voltage (voltage waveform between the terminals L and N) and a voltage waveform between the terminal N and the ground GND.
- the present approach allows efficient dimming of at least one light source, in particular at least one lamp or a light-emitting diode.
- the at least one light source is supplied with electrical power via at least one lamp control.
- a circuit comprising one input per network connection (L), preferably by means of a pre-filter, a threshold and / or a post-filter suppresses a power frequency modulation of the control signals.
- overshoots are reduced or (largely) avoided when switching between the network inputs.
- Such overshoots are based for example on the fact that a changed signal is already present before the previous signal has subsided.
- the circuit can keep a power setpoint within wide limits regardless of the level of the mains voltage (almost) constant.
- the presented approach evaluates the voltage at an N-terminal of the mains voltage and deactivates the control or dimming control as long as the voltage at the N-terminal is positive with respect to an internal ground potential. This effectively eliminates noise from X capacitors and external loads on the L terminals.
- Luminous flux modulation is not particularly pronounced.
- the power levels or dimming levels can be switched without overshoot. Any loads on the switched L-connections do not affect the function.
- a multi-stage electronic ballast (ECG) is described for dimming at least one light source.
- the lighting means may be bulbs of any type.
- the lamp is powered by a lamp control, the lamp control in turn can be controlled by the dimming control accordingly.
- the dimming control and the lamp control can be implemented in a single device or in different devices.
- an electronic ballast with dimming control for a light source is described here by way of example. Accordingly, the dimming control could be performed separately from the electronic ballast or it could be controlled according to several bulbs.
- the multi-level electronic ballast with dimming control has two L-ports La, Lb and one N-port.
- the desired dimming position (brightness of the illuminant) can be set by setting two switches S1 and S2 according to the following table of values:
- Fig.l shows a circuit example of an ECG with a dimming functionality.
- An AC voltage or mains voltage 135 has an L terminal and an N terminal.
- the L terminal of the mains voltage 135 is connected to a node 133 via a series connection of a switch S1 and a first winding of a filter inductor L1. Furthermore, the L terminal of the mains voltage 135 is connected to an account 132 via a series connection of a switch S2 and a second winding of the filter inductor L1.
- the N-terminal of the mains voltage 135 is connected to a node 131 via a third winding of the filter choke L1.
- the center tap of the series connection of the switch S2 and the second winding of the filter inductor L1 is connected to the N-terminal via an X-capacitor CxI and the center tap of the series connection of the switch S1 and the first winding of the filter inductor L1 is connected to the N-terminal connected.
- a node between the switch Sl and the first winding of the filter inductor Ll is referred to as a terminal La. Accordingly, a node between the switch S2 and the second winding of the filter inductor L1 is referred to as a terminal Lb.
- the node 133 is connected to the anode of a diode D3 and to the cathode of a diode D6.
- the cathode of the diode D3 is connected to a node 136 and the anode of the diode D6 is connected to ground GND.
- the node 132 is connected to the anode of a diode D2 and to the cathode of a diode D5.
- the cathode of diode D2 is connected to node 136 and the anode of diode D5 is connected to ground GND.
- the node 131 is connected to the anode of a diode Dl and to the cathode of a diode D4.
- the cathode of the diode Dl is with the Node 136 and the anode of diode D4 are connected to ground GND.
- an X-capacitor Cx3 is provided between the bank 136 and ground GND.
- a lamp controller 110 is connected on the input side to the node 136 and to ground GND. At the output of the lamp control 110, a lighting means 111 is connected. Furthermore, the lamp controller 110 has a
- Input 134 by means of which a brightness of the lamp 111 is adjustable.
- the value for adjusting the brightness is supplied to the input 134 of the lamp controller 110 by means of a dimming controller 120.
- the dimming controller 120 is connected on the input side to the nodes 131, 132 and 133.
- the dimming control 120 will be described in more detail below:
- the node 131 is connected to the base of an npn transistor Q3 through a resistor RIl. Between the base and the emitter of the transistor Q3, a resistor R12 is provided, wherein the emitter of the transistor Q3 is at ground GND. The collector of transistor Q3 is connected to the
- the anode of the diode D8 is connected to a node 138.
- the node 138 is connected to the node 132 via a resistor R2.
- the node 138 is connected to a node 139 via a resistor R4.
- a capacitor C2 is provided between the node 139 and the ground GND.
- the node 139 is connected through a resistor R6 to the emitter of a pnp transistor Q2.
- the collector of the transistor Q2 is connected to a node 140 via a resistor R8.
- Transistor Q2 is connected to a terminal for a reference voltage Vref, to the base of a PNP transistor Q1, and through a resistor R9 to node 140.
- the collector of the transistor Ql is connected to the node 140 via a resistor R7.
- Transistor Ql is connected through a resistor to a node 141.
- the node 141 is connected via a capacitor Cl to ground GND. Furthermore, the node 141 is connected to a node 137 via a resistor R3.
- the node 137 is connected to the anode of the diode D7 and to the node 133 via a resistor R1.
- the node 140 is connected to the input 134 of the lamp controller 110.
- each L terminal La and Lb and the N terminal has its own pair of diodes (La: D3, D6, Lb: D2, D5, N: Dl, D4) for rectifying the AC voltage 135.
- the rectified AC voltage 136 is the Lamp control 110 supplied.
- the current-compensated filter choke Ll is provided for sparking and has three windings, one winding for the two L-ports La, Lb and the N-port.
- At least one X-capacitor (CxI, Cx2) is provided before or after the filter inductor Ll (in front of the rectifier).
- a common X capacitor Cx3 can be provided at the input of the lamp control 110.
- the dimming controller 120 generates a set point (at the node 140) corresponding to the desired dimming position for the lamp controller 110 depending on the voltage at the L terminals La, Lb.
- FIG. 2 shows a voltage curve 210 of the mains voltage 135 (voltage profile between the terminals L and N) and a voltage curve 220 between the terminals L and the ground GND.
- the voltage curve 220 corresponds to the voltage profile at the node La, ie the voltage V L _GND at La in relation to the internal ground GND comprises the shown power-frequency sinusoidal half-waves 220.
- These sine half-waves 220 are used to connect the capacitor Cl to a via the resistors R1 and R3
- the low residual modulation due to the finite steep base-emitter characteristic of the transistor Ql is further smoothed by the capacitor C3.
- An upper power level or dimming level can be composed of the sum of the two dimming levels described above (both switches S1 and S2 are closed). Accordingly, the signal supplied to the lamp controller 110 at its input 134 for adjusting the brightness of the illuminant 111.
- this upper power level is different from the sum of the two lower power levels.
- This can be adjusted via the resistor R9, wherein the resistor R9 can also be switched between the reference voltage Vref and the actual value input of the regulator if required.
- three power levels or dimming levels on the resistors R7, R8, R9 can be adjusted.
- V N _ GND voltage curve 230 between the terminal N and the ground GND.
- the voltage curves V L _ GND 220 from FIG. 2 and V N _ GND 230 from FIG. 3 differ in their phase position.
- the phase position of the voltages at the terminals La and Lb must therefore be evaluated. This is done by means of the transistor Q3, which is turned on via the resistor RIl, as long as the voltage V N _ GND 230 is positive. In this case, the two inputs of the dimming controller 120 are short-circuited via the diodes D7 and D8. This ensures that only the evaluation of in-phase signals takes place.
- the two diodes D7 and D8 serve to decouple the two inputs (ie nodes 132 and 133).
- the capacitor C1 and the capacitor C2 are each discharged so fast that not simultaneously the transistor Ql and the transistor Q2 are conductive. Otherwise, the upper dimming level would be temporarily set.
- a fast discharge of the capacitors C 1 and C 2 can be achieved in each case by selecting a relatively small capacitance, assisted by a periodic stronger discharge by means of the transistor Q 3 and the resistors R 3 and R 4, respectively.
- FIG. 4 shows a modified one in comparison to FIG
- Dimming control 400 The wiring of the dimming control 400 can take place in accordance with FIG. This is indicated by the connections of the dimming control 400 to the nodes 131, 132 and 133 as well as to the input 134 of the lamp control 110 according to FIG.
- a block 410 within the dimming controller 400 can also be found in the dimming control 120 according to FIG.
- Block 410 may be identified via nodes 139, 141, and 140, as shown in FIG. Accordingly, reference is made to the description of Fig.l.
- the dimming control 400 according to FIG. 4 will be explained in more detail below:
- the node 131 is connected to a node 431 via a resistor R21. Between the node 431 and the ground GND, a resistor R26 is arranged.
- the node 431 is connected to the base of a pnp transistor Q5 through a resistor R24.
- the emitter of the transistor Q5 is connected to the node via a resistor R23 133 connected.
- the collector of the transistor Q5 is connected on the one hand to the node 141 and on the other hand via a resistor R28 to the ground GND.
- the node 431 is connected through a resistor R25 to the base of a PNP transistor Q4.
- the emitter of the transistor Q4 is connected to the node 132 via a resistor R22.
- the collector of the transistor Q4 is connected on the one hand to the node 139 and on the other hand via a resistor R27 to the ground GND.
- the dimming controller 400 uses the two transistors Q4 and Q5, which are only turned on via the resistor R21 as long as the voltage V N _ GND is sufficiently small.
- the dimming controller 400 Since the dimming controller 400 has no means for periodically discharging the two capacitors Cl and C2, the resistors R28 and R27 are respectively grounded to ensure sufficiently fast discharge when switching between the dimming stages.
- Another alternative for querying the states of the switches Sl and S2 is the use of a microcontroller. So it is possible to query the voltage V N _ GND by means of the microcontroller and, if it is just zero or below a certain limit, to determine a current setpoint from the two voltages V La _ GND and V Lb _ GND according to the above table of values ,
- the approach presented here can be used to dimming any lamps.
- a stepwise dimming can be achieved in an efficient manner.
- Possible applications include emergency lighting or tunnel lighting.
Landscapes
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/062352 WO2010031429A2 (de) | 2008-09-17 | 2008-09-17 | Schaltung und verfahren zum dimmen eines leuchtmittels |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2335459A2 true EP2335459A2 (de) | 2011-06-22 |
EP2335459B1 EP2335459B1 (de) | 2017-01-18 |
Family
ID=41809210
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08875143.3A Not-in-force EP2335459B1 (de) | 2008-09-17 | 2008-09-17 | Schaltung und verfahren zum dimmen eines leuchtmittels |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110156614A1 (de) |
EP (1) | EP2335459B1 (de) |
KR (1) | KR20110060936A (de) |
CN (1) | CN102160468B (de) |
WO (1) | WO2010031429A2 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8319451B2 (en) * | 2011-02-10 | 2012-11-27 | Osram Sylvania Inc. | Two light level control circuit |
US20120249150A1 (en) * | 2011-03-31 | 2012-10-04 | Osram Sylvania Inc. | Switch status detection circuit for multiple light level lighting systems |
US8674617B2 (en) * | 2011-03-31 | 2014-03-18 | Osram Sylvania Inc. | Multiple light level electronic power converter |
WO2020249662A1 (en) * | 2019-06-14 | 2020-12-17 | Signify Holding B.V. | An led driver control circuit |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6069457A (en) * | 1998-01-20 | 2000-05-30 | Lumion University | Method and apparatus for controlling lights and other devices |
CN1144509C (zh) * | 2000-03-08 | 2004-03-31 | 刘南星 | 装饰灯组 |
US6674248B2 (en) * | 2001-06-22 | 2004-01-06 | Lutron Electronics Co., Inc. | Electronic ballast |
US7084579B2 (en) * | 2004-12-13 | 2006-08-01 | Osram Sylvania Inc. | Two light level ballast |
EP1845755A3 (de) * | 2006-04-10 | 2014-04-02 | EMD Technologies, Inc. | Beleuchtungssysteme |
CN101558693A (zh) * | 2007-01-29 | 2009-10-14 | 奥斯兰姆有限公司 | 用于对发光装置分级调光的电子驱动设备和方法 |
US7868561B2 (en) * | 2007-10-31 | 2011-01-11 | Lutron Electronics Co., Inc. | Two-wire dimmer circuit for a screw-in compact fluorescent lamp |
US7843141B1 (en) * | 2007-11-19 | 2010-11-30 | Universal Lighting Technologies, Inc. | Low cost step dimming interface for an electronic ballast |
-
2008
- 2008-09-17 EP EP08875143.3A patent/EP2335459B1/de not_active Not-in-force
- 2008-09-17 WO PCT/EP2008/062352 patent/WO2010031429A2/de active Application Filing
- 2008-09-17 CN CN200880131157.0A patent/CN102160468B/zh not_active Expired - Fee Related
- 2008-09-17 KR KR1020117008783A patent/KR20110060936A/ko not_active Application Discontinuation
- 2008-09-17 US US13/060,706 patent/US20110156614A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2010031429A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010031429A2 (de) | 2010-03-25 |
US20110156614A1 (en) | 2011-06-30 |
KR20110060936A (ko) | 2011-06-08 |
CN102160468A (zh) | 2011-08-17 |
CN102160468B (zh) | 2014-02-19 |
EP2335459B1 (de) | 2017-01-18 |
WO2010031429A3 (de) | 2010-05-14 |
WO2010031429A9 (de) | 2010-06-24 |
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