WO2014075117A2 - Appareil destiné à faire fonctionner un moyen d'éclairage et procédé permettant de faire varier ledit moyen d'éclairage - Google Patents

Appareil destiné à faire fonctionner un moyen d'éclairage et procédé permettant de faire varier ledit moyen d'éclairage Download PDF

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Publication number
WO2014075117A2
WO2014075117A2 PCT/AT2013/000190 AT2013000190W WO2014075117A2 WO 2014075117 A2 WO2014075117 A2 WO 2014075117A2 AT 2013000190 W AT2013000190 W AT 2013000190W WO 2014075117 A2 WO2014075117 A2 WO 2014075117A2
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WO
WIPO (PCT)
Prior art keywords
operating device
signal
terminal
supply voltage
control device
Prior art date
Application number
PCT/AT2013/000190
Other languages
German (de)
English (en)
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WO2014075117A3 (fr
Inventor
Philip JERMYN
Original Assignee
Tridonic Gmbh & Co. Kg
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Filing date
Publication date
Application filed by Tridonic Gmbh & Co. Kg filed Critical Tridonic Gmbh & Co. Kg
Publication of WO2014075117A2 publication Critical patent/WO2014075117A2/fr
Publication of WO2014075117A3 publication Critical patent/WO2014075117A3/fr

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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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the 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
    • 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

Definitions

  • the invention relates to operating devices for lighting and method for controlling a control gear for a Leuchtmittei.
  • the invention relates to operating devices and methods which permit dimming of the luminous means.
  • Dimmers can be used to control the brightness of lamps.
  • a dimming level can be preset by a dimmer via a phase angle or phase section of the supply voltage.
  • the power is reduced by a short-term interruption of the supply voltage is effected after or before the zero crossing of the supply voltage, so that the power of the lamp is reduced.
  • the extent of the reduction can be controlled by the length of the phase angle or phase section.
  • such a procedure may be subject to restrictions that have a detrimental effect on the dimming behavior.
  • the object of the invention is to provide an operating device for a luminous means and a method which facilitates the achievement of low levels of brightness.
  • an operating device for a lighting device which has a control device for controlling the operating device as a function of a Dimming level includes.
  • Circuitry is coupled to the controller and configured to alter a signal at a terminal of the controller when the dimming level meets a predetermined criterion.
  • the dimming behavior can be selectively influenced, for example at low dimming levels.
  • a control behavior of the operating device can be influenced so that lower brightnesses are achieved. It is not necessary to modify the control logic of the controller itself, as the circuitry acts on signal supplied to the controller.
  • the control device can be set up to regulate a controlled variable to a desired value.
  • the circuit arrangement may be configured to influence a deviation between the controlled variable and the setpoint detected by the control device when the dimming level meets the predetermined criterion. In particular, the deviation detected by the control device can then be selectively increased by the circuit arrangement beyond its actual value if the dimming level is less than a threshold value. The control behavior of the control device then leads to a further reduction of the brightness.
  • the controller may include a first terminal for receiving a first signal and a second terminal for receiving a second signal. The controller may be configured to control the operating device in response to a comparison of the second signal with the first signal.
  • the circuit arrangement can be set up to change the first signal and / or the second signal if the dimming level is less than a threshold value.
  • the deviation between the controlled variable and the setpoint detected by the control device can be selectively increased by the circuit arrangement selectively beyond its actual value if the dimming level is less than a threshold value. If the control device controls a converter, in particular the time-dependent switching of a controllable switch can be influenced via the circuit arrangement, so that a lower output current results.
  • the first signal may depend on an average rectified supply voltage of the operating device. This is a suitable measure of a dimming level for phase segment dimming or phase dimming.
  • the circuitry may be arranged to reduce the first signal when the average rectified supply voltage is less than a threshold is worth.
  • the circuitry may be configured not to affect the first signal when the average rectified supply voltage is greater than the threshold.
  • the circuitry may be arranged to increase the second signal when the average rectified supply voltage is less than a threshold.
  • the operating device may be configured to inject an alternating current at the first connection and thus to generate a time-varying potential at the first connection with the supply voltage.
  • the injected alternating current can vary with a supply voltage. This allows a better power factor correction to be achieved.
  • the total Harmonic Distortion (THD) of the input current can be reduced.
  • the first signal may represent a set point of peak current on a primary side of a transformer.
  • the second signal may represent an actual value of the current at the primary side of the transformer.
  • the circuitry may include controllable switching means coupled to the first terminal or the second terminal.
  • the controllable switching means may comprise a transistor.
  • the controllable switching means can be switched depending on a dimming level.
  • the controllable switching means can be switched depending on a time average of a rectified supply voltage of the operating device.
  • the circuitry may include an inductor coupled to the transformer to produce a negative potential.
  • the controllable switching means may be coupled to the negative potential. In this way, dimming can be achieved up to very low levels of brightness.
  • the operating device may include a DC-DC converter.
  • the controller may be configured to control the DC-DC converter in response to a deviation between the controlled variable and the setpoint.
  • the DC-DC converter can be designed as a flyback converter.
  • the operating device can be designed as a constant current source. Accordingly, the controller can realize a constant current control loop.
  • the operating device can be designed as an LED converter.
  • a lighting system is specified.
  • the lighting system comprises at least one operating device for a lighting means according to an embodiment and a dimmer.
  • the dimmer may be configured to generate phase cuts and / or phase portions of a supply voltage supplied to the operating device.
  • the lighting system may include at least one light source connected to the operating device.
  • the lighting means may comprise at least one light-emitting diode.
  • a method for dimming a light source includes controlling a controlled variable of a lighting device to a setpoint that depends on a dimming level.
  • a first signal, which depends on the desired value, and / or a second signal, which depends on an actual value of the controlled variable, is selectively influenced when the dimming level meets a predetermined criterion.
  • the dimming behavior can be influenced.
  • a deviation between the controlled variable and the setpoint detected by a control device can then be selectively increased by the circuit arrangement beyond its actual value if the dimming level is less than a threshold value.
  • the control behavior of the operating device leads to a reduction of the output current. At low dimming levels, smaller illuminances of the illuminant can be achieved.
  • a power factor correction is provided for an operating device of a lighting device.
  • the features of this aspect in particular provide an improvement in power factor correction.
  • An operating device for a luminous means comprises a control device which has a first terminal for receiving a first signal and a second terminal for receiving a second signal.
  • the controller is configured to control the operating device in response to a deviation between the second signal and the first signal.
  • the operating device includes an auxiliary circuit for time-dependent, in particular periodically changing a potential at the first terminal.
  • An alternating current can be injected at the first connection.
  • the injected alternating current can vary with a supply voltage. This allows a better power factor correction to be achieved.
  • the total Harmonic Distortion (THD) of the input current can be reduced.
  • the auxiliary circuit may comprise a capacitor connected to the first terminal.
  • FIG. 1 shows a lighting system with a control device for a lighting means according to an embodiment of the invention.
  • FIG. 2 is a block diagram of an operating device according to an embodiment.
  • FIG. 3 is a circuit diagram of an operating device according to an embodiment.
  • FIG. 4 is a flowchart of a method according to an embodiment.
  • FIG. 5 shows a supply voltage of the operating device in the case of phase section dimensions.
  • FIG. 6 is a circuit diagram of an operating device according to an embodiment.
  • Fig. 7 is a circuit diagram of an operating device according to an embodiment.
  • Fig. 8 shows an input current of operating devices according to embodiments in comparison with an input current in conventional operating devices.
  • 9 is a circuit diagram of an operating device according to an embodiment.
  • Fig. 1 illustrates a lighting system with a lighting device for a lighting device according to an embodiment of the invention.
  • the lighting system comprises a supply source 10, for example a mains voltage source, a dimmer 50 and a luminaire 90 or a plurality of luminaires 90.
  • the luminaire 90 has an operating device 100 according to an exemplary embodiment and a luminous means 92.
  • the light source 92 may include one or more light emitting diodes (LEDs). Accordingly, the operating device 100 may be designed as an LED converter.
  • the light-emitting means 92 can be implemented in various ways, for example by one or more inorganic LEDs, organic LEDs, gas discharge lamps, other lamps or a combination of the aforementioned types of lamps.
  • the operating device 100 may, for example, comprise a power supply which generates a suitable voltage and / or a suitable current from a supply voltage supplied to the luminaire for operating the luminous means 92.
  • the operating device 100 is dimmable to adjust a brightness of the luminous means 92 according to a predetermined dimming level.
  • the dimming level can be specified via the dimmer 50.
  • the dimmer 50 may be configured to generate phase cuts or phase portions of the supply voltage. In this way, phase gating dimming or phase dimming may be performed.
  • the dimmer 50 may be provided in a so-called "one-wire" wiring, in which the dimmer 50 is connected to a mains voltage conductor 30 and a load conductor 40, but does not have to be connected to the further mains voltage conductor 20.
  • the mains voltage conductor 30 may be a phase conductor, for example.
  • the dimmer 50 may be connected to both a phase conductor and a neutral of the supply source.
  • the dimmer 50 includes a control circuit 51 for generating phase cuts or phase portions of the supply voltage.
  • the control circuit 51 controls the provision of the supply voltage to the lamp 90 so that a supply voltage to the lamp 90 is provided only over a certain phase angle during a half period of the supply voltage. By adjusting this phase angle, where voltage is provided to fixture 90, the average power provided, and thus the dimming level, can be controlled.
  • the phase angle can, for example, depend on an actuation of a manually operable input.
  • a control for example, in automatic brightness or color control, are set.
  • the operating device 100 may include a controller.
  • the controller may be configured as a microcontroller, controller, processor or other integrated circuit.
  • the controller controls the operating device 100 according to a control loop to control a controlled variable to a desired value.
  • the control device can realize a constant-current control loop.
  • the setpoint may depend on the dimming level.
  • the control device has a circuit arrangement which influences the deviation between the control variable and the setpoint detected by the control device so as to influence the control loop.
  • the circuit arrangement can selectively influence a signal evaluated by the control device at small dimming levels such that an output current of the operating device and thus the brightness of the lighting device are further reduced.
  • the circuit arrangement selectively influences a potential at an input of the control device at small dimming levels such that the control circuit of the control device further reduces an output current of the operating device.
  • An intervention in the control logic of the control device itself is not necessarily required.
  • FIG. 2 is a block diagram representation of an operating device 100 according to one embodiment.
  • the operating device 100 can operate as a constant current source.
  • the operating device 100 may be configured as an LED converter.
  • the operating device 100 has a rectifier 101 on the input side.
  • the rectified supply voltage at the input of the operating device may be smoothed by a smoothing circuit 102 (also referred to as a power factor correction circuit or PFC circuit).
  • the smoothing circuit 102 may perform power factor correction to reduce the overall harmonic distortion (THD) and increase the power factor.
  • a DC-DC converter 103 can be controlled by a control device 10.
  • the DC-DC converter 103 may include a transformer.
  • the control device 110 can implement a control loop in order to influence a manipulated variable as a function of a deviation between a controlled variable and a nominal value of the controlled variable.
  • the manipulated variable may be, for example, a manipulated variable of the DC-DC converter 103, for example, a time in which a switching means of the DC-DC converter 103 is switched to an on state.
  • the controlled variable may be a current intensity, in particular a peak current intensity, on a primary side of the DC-DC converter 103.
  • the setpoint of the controlled variable may depend on the desired dimming level.
  • An output current can be output via an output driver 104 to the light source.
  • the control device 10 can influence the brightness of the luminous means according to a desired dimming level by regulating a controlled variable to a desired value.
  • the control device 110 can determine a deviation between a second signal s2, which represents the controlled variable, and a first signal s1, which represents the desired value.
  • the control device 110 can control the operating device 100 as a function of the detected deviation, for example, to regulate a peak current at a primary side of a transformer to a desired value.
  • a circuit arrangement 120 can influence the deviation between the controlled variable and the nominal value detected by the control device 120.
  • the circuit arrangement 120 can increase the deviation between the controlled variable and the setpoint value detected by the control device 110 above its actual value in order to further reduce the brightness of the luminous means. This can be done selectively at small dimming levels.
  • the circuitry 120 may selectively affect a potential at a terminal of the circuitry at small dimming levels to vary the deviation between the controlled variable and the set point detected by the control device 110.
  • the circuit arrangement 120 can leave the potential at the corresponding terminal of the control device 110 unchanged.
  • the circuit arrangement 120 can accordingly generate an auxiliary signal s aux selectively only when the dimming level is less than a threshold value.
  • the control device can have a first connection 11 1 for a first signal s1, which depends on the desired value of the controlled variable.
  • the control device may have a second terminal 12 1 for a second signal s 2, which depends on the controlled variable.
  • a control signal ctrl for example for controlling a switching means of the converter 103, can be generated as a function of the deviation between the second signal s2 and the first signal s1.
  • the control signal can be controlled via a connection 13.
  • the corresponding switching means of the converter 103 which is switched by the control device 110, may also be integrated in the control device 110.
  • the circuit arrangement 120 may influence a signal at one of the terminals 1 1 1, 1 12 of the control device.
  • the first signal s1 can be selectively reduced when a dimming level DL is smaller than a threshold value.
  • the second signal s2 can be selectively increased if the dimming level DL is smaller than the threshold value.
  • an average value of the rectified supply voltage can serve as a measure of the desired dimming level.
  • the circuitry 120 may be configured to affect a signal processed by the controller 110 to further reduce the brightness of the illuminant when an average of the rectified supply voltage is less than a threshold.
  • the first signal s1 representing the desired value can likewise be generated as a function of an average value of the rectified supply voltage.
  • FIG. 3 is a circuit diagram of an operating device 100 according to an exemplary embodiment. Elements or devices that correspond in their design or function to elements or devices described with reference to FIG. 1 or FIG. 2 are designated by the same reference numerals.
  • the operating device 100 has a converter with the topology of a flyback converter. Other converter types can be used.
  • the flyback converter is supplied with a rectified supply voltage at input terminals 154, 155.
  • the flyback converter comprises a primary-side first inductor 121, e.g. a primary coil of a transformer, and a secondary-side second inductance 131, e.g. a secondary coil of the transformer.
  • a diode 132 may be connected to the second inductance 131 and connected between the second inductance 131 and an output of the operating device.
  • a capacitor 133 may be connected to output terminals 134, 135 of the secondary side:
  • a reference voltage for a control loop may be provided by a capacitor 123.
  • the capacitor 123 may be coupled to at least one of the input terminals 54 so that the charge on the capacitor 23 provides a measure of a time average of the rectified supply voltage.
  • the controller 110 may itself charge the capacitor 123 depending on a dimming level. The charge of the capacitor 23 may be dependent on a time average of the rectified supply voltage.
  • a first terminal 1 1 1 of the control device 1 10 is connected to the capacitor 123.
  • At the first terminal 11 1 is a reference potential for a control, which is executed by the control device 1 10.
  • a potential detected at a second terminal 12 may match the reference potential at the first Connection 1 1 1 are compared.
  • a controllable switching means 122 can be controlled.
  • a constant current control can be realized in this way by the control device 110.
  • the charge of the capacitor 123 can be automatically adjusted so that the average output current is kept constant.
  • a voltage or current on the primary side of the transformer can be detected.
  • a current intensity on the primary side of the transformer can be detected via a measuring resistor 125, to which the voltage drop across the measuring resistor 125 is proportional.
  • the operation of the flyback converter can be controlled depending on a deviation between the setpoint, which is detected at the first terminal 1 1 1, and the controlled variable, which is detected at the second terminal 1 12.
  • an actuation of a switching means 122 of the flyback converter can take place depending on the detected deviation.
  • the switching means 122 may be switched depending on a comparison between the signals applied to the first terminal 1 1 1 and the second terminal 1 12.
  • control device 10 can generate, for example, a corresponding control signal.
  • the control signal can be output via a connection 113.
  • the switching means 122 may be integrated into the control device 110.
  • the switching means may comprise a MOSFET formed as part of an integrated circuit forming the control means 110.
  • a circuit arrangement 120 is provided in order to influence the deviation between controlled variable and desired value detected by the control device 10.
  • the circuit arrangement 120 influences the potential at the first terminal 1 1 1.
  • the circuit arrangement 120 can pull the potential at the first terminal 11 1 in the direction of ground potential PO.
  • the circuit arrangement 120 can selectively pull the potential at the first terminal 1 1 1 to the ground potential PO only when an average value of the rectified supply voltage of the converter becomes smaller than a threshold value.
  • the circuit arrangement 120 may increase a potential at the second terminal 12 when an average value of the rectified supply voltage of the converter becomes smaller than the threshold value. In both cases, the control behavior of the operating device at low dimming levels is influenced in such a way that the output current is further reduced.
  • the control device 1 10 may be coupled to the transformer.
  • Another inductance 141 for example a another coil, may be inductively coupled to the first inductor 121.
  • the further inductance can be coupled to the ground potential PO via a diode 142, a resistor 143 and a capacitor 144.
  • a supply voltage for the control device 1 10 can be tapped.
  • a demagnetization of the transformer can be detected. For this purpose, for example, voltage at the resistor 143 can be detected.
  • the further inductor 141 may also be used to generate a negative potential to which the circuitry 120 is coupled.
  • the method 200 may be performed automatically by the operating device 100 according to one embodiment.
  • the method may include controlling a peak current on a primary side of a transformer to a setpoint that depends on a dimming level.
  • the dimming level can be defined by phase sections and / or phase cuts of the supply voltage.
  • Step 201 it is determined whether a dimming level is less than a threshold.
  • Step 201 may include determining an average of a rectified supply voltage of the operating device. The mean value of the rectified supply voltage can be compared to a threshold value.
  • an auxiliary signal may be selectively generated to affect an input signal of a control loop when the dimming level is small.
  • a desired value for the control variable supplied to the control device can be reduced so that the control circuit further reduces the brightness of the lighting means.
  • a control variable supplied to the control variable of the control loop can be increased, so that the control circuit further reduces the brightness of the lighting means.
  • control of the operating device may occur.
  • a current on a primary side of a transformer can be regulated to a setpoint that depends on the dimming level.
  • a switching means of a transducer e.g. a flyback converter, can be switched depending on a comparison of the controlled variable with the setpoint. The method may then return to step 201.
  • Fig. 5 illustrates a supply voltage 210 which is supplied to the operating device according to an embodiment.
  • Phase cuts and / or phase sections 21 1 are generated for example by a dimmer.
  • a time average 212 of the rectified supply voltage influences the dimming level.
  • the circuitry 120 may selectively alter a first signal representing the setpoint of the controlled variable and / or a second signal representing the controlled variable when the average 212 is less than a threshold of 2.3. As a result, the brightness of the luminous means can be further reduced without having to change the control behavior of the control device itself.
  • FIG. 6 is a circuit diagram of an operating device 100 according to an exemplary embodiment. Elements or devices that correspond in their design or function to elements or devices described with reference to FIGS. 1 to 5 are designated by the same reference numerals.
  • the operating device 100 has a rectifier 101 for rectifying a supply voltage received at input terminals 151, 152.
  • a rectifier 101 for rectifying a supply voltage received at input terminals 151, 152.
  • an inductance 105 which is connected between an output of the rectifier and a converter, and a capacitor 106, which is connected to the inductance 105, may be provided.
  • the converter of the operating device 100 may have the topology of a flyback converter.
  • a switching means of the converter is integrated in the embodiment shown in Fig. 6 in the control device 1 10.
  • the switching means may comprise a MOSFET.
  • When charging the first inductor 121 current may flow from the first inductor 121 via the switching means of the controller 110 and the resistor 125. For discharging the first inductance 121, the switching means can be switched to an off state.
  • the first inductance When discharging the first inductance 121, the first inductance can discharge via a diode 126 and a resistor 127.
  • a capacitor 128 may be connected in parallel with resistor 127 to reduce current peaks.
  • the peak current on the primary side of the transformer can be detected, which drops across the resistor 125 when the first inductor 121 is charged.
  • the corresponding second signal which represents the current intensity, is detected at the second terminal 1 12 of the control device 1 10.
  • a signal that is from the time average of the rectified . Supply voltage depends, may be present at the first terminal 1 1 1 of the control device 110.
  • a series circuit of the capacitor 123 and another capacitor 124 may be connected to the first terminal 11 1.
  • the capacitance of the capacitor 123 connected to the first terminal 11 1 can be much larger than the capacitance of the capacitor 124.
  • the potential at the first terminal 1 1 1 serves as a reference potential for a control loop.
  • the control device 110 may, for example, be arranged such that the controllable switching means of the flyback converter is switched as a function of a comparison of the potential at the second terminal 12 and the reference potential at the first terminal 11.
  • the control device 110 can be set up in order to control the converter in such a way that the signal received at the second connection 1 2 approaches the signal present at the first connection 111.
  • the operating device 100 comprise a circuit arrangement which reduces the potential at the first terminal 1 1 1 in order to further reduce the brightness of the luminous means when the dimming level is small, for example smaller than a threshold value.
  • the circuit arrangement comprises a circuit part 160, which reduces the potential at the first terminal 11 1.
  • the circuit arrangement may optionally comprise a further circuit part 170 which generates a negative potential relative to the ground potential PO.
  • a controllable switching means 161 for example a transistor, is connected to at least one of the first terminal 1 1 1 and the second terminal 1 12.
  • the controllable switching means 161 can reduce the potential at the first terminal 11 at low dimming levels.
  • a gate of the controllable switching means 161 is connected to a node between resistors 163 and 164 of a voltage divider comprising the resistors 162, 163 and 164.
  • a capacitor 165 may be provided between a node between the resistors 162 and 163 and the ground potential PO.
  • the controllable switching means 161 pulls the potential at the first terminal 11 towards ground potential PO.
  • the controllable switching means 161 is in an off state.
  • the potential at the first terminal 111 is not affected by the controllable switching means 161 when the dimming level is high. At high dimming levels, i. at high output currents of the operating device, the control behavior is not affected. At low dimming levels, the control behavior is influenced via the controllable switching means 161 in such a way that lower output currents are achieved.
  • the further circuit part 170 may be connected via the resistor 164 of the voltage divider to the gate of the controllable switching means 61 in order to provide a negative potential relative to the ground potential. Due to the negative potential at the resistor 164, for example, from -0.6 V, the emitter follower of the transistor 161 can reduce the potential at the first terminal 111 to the ground potential.
  • the negative potential at the resistor 164 may be from the further circuit part 170, which is coupled to the further inductance 141.
  • a capacitor 171 is connected via a diode 172 to the further inductance 141.
  • a further diode 173 may be provided in parallel with the capacitor 172, wherein the cathode of the further diode 173 may be connected to the capacitor 171 via a resistor 174.
  • the capacitor 171 is charged by the further inductance 141 so that a negative potential can be generated at one terminal of the resistor 164 of the voltage divider.
  • a time-varying signal component can be impressed on the potential at the first terminal 11 1 of the control device 10.
  • a time-variable, in particular periodic signal component can be generated via a further voltage divider with resistors 181 and 182, which are connected to the output of the rectifier.
  • This time-varying signal component which can change over time in particular with the supply voltage, can be superimposed on the signal at the first terminal 11.
  • a node between the resistors 181 and 182 may be connected to a node between the capacitors 123 and 124.
  • the capacitor 23 which has a relatively large capacitance, it is ensured that the time average of the signal at the first terminal 1 1 1 remains proportional to the mean value of the rectified supply voltage, as long as the potential is not selectively by the controllable switching means 161 on is reduced. Since the mean value of the signal at the first terminal 1 1 1 is not changed by the impressing of the temporally varying with the supply voltage signal component, the control behavior is not affected.
  • the time-varying signal component with the supply voltage can reduce the overall harmonic distortion of the input current and improve the power factor correction. This will be described in detail with reference to FIGS. 7 and 8.
  • the control device 1 10 may have further connections.
  • the control device may have a ground connection.
  • To detect the demagnetization of the transformer can be detected via a voltage divider with resistors 146 and 147, the voltage across the series circuit of diode 142, resistor 143 and capacitor 144 drops.
  • An output of a transconductance amplifier of the control device 110 may be coupled to ground via a capacitor 148 and a resistor 149.
  • FIG. 7 is a circuit diagram of an operating device 100 according to an exemplary embodiment. Elements or devices that in their design or function elements or Corresponding to devices which have been described with reference to FIGS. 1 to 6 are designated by the same reference numerals.
  • the operating device 00 has a converter and a control device 110 for controlling the converter.
  • the control device 1 10 has a first terminal 1 1 1 and a second terminal 1 12 to receive the signals required for a current control.
  • the first terminal 1 11 is connected to a capacitor 123.
  • a reference potential is received, which may depend on the time average of the rectified supply voltage.
  • the signal at the first terminal 111 has a time-varying signal component.
  • the capacitor 123 ensures that the time-average value of the signal at the terminal remains unchanged over a period of the supply voltage due to the time-varying signal component which is impressed via the voltage divider 181, 182.
  • the control behavior of the operating device is thus not influenced by the impressing of the time with the supply voltage variable signal component at the first terminal 1 1 1.
  • the provision of the temporally variable with the supply voltage signal component does not affect the average output current of the operating device.
  • the control device 110 may be configured such that a comparison of the signals at the first terminal 1111 and the second terminal 112 determines when a switching means of a converter is switched to an on state.
  • the control device 110 may be configured such that the first inductance 121 of a flyback converter is charged at time intervals that depend on a comparison of the signals at the first terminal 1111 and the second terminal 112.
  • the imprinting of a time-varying signal component or the injection of a time-variable current at the first terminal 1 1 1 leads to an improved power factor correction, as shown in FIG. 8.
  • FIG. 8 shows the input current 221 of an operating device, in which, as shown in FIG. 6 or FIG. 7, a signal is superimposed on the signal at the first terminal 11 of the control device 110 a time-varying signal component with the supply voltage.
  • the input current 222 likewise shown for comparison results in an operating device which has no temporal variable at the first terminal of the control device. imprinting signal component is impressed.
  • the input stream 222 has a strong overall harmonic distortion. By impressing the time-varying signal component on the signal at the first terminal 111, the total harmonic distortion is significantly reduced, as can be seen for the input current 221.
  • the mean output current of the operating device is not changed by the superimposition of the temporally varying with the supply voltage signal component, so that the control behavior is not affected.
  • the application of a signal component which varies in time with the supply voltage to the signal at the first terminal 1 1 1 of the control device can be combined with the influencing of the potential at the first terminal 1 1 1, which is dependent on the dimming level.
  • the impressing of the temporally varying, in particular periodic, signal component on the first terminal 11 can also be used to improve the power factor correction, without a dimming level-dependent selective influencing of the potential taking place.
  • FIG. 9 is a circuit diagram of an operating device 100 according to an embodiment. Elements or devices that correspond in their design or function to elements or devices described with reference to FIGS. 1 to 8 are designated by the same reference numerals.
  • the circuit arrangement 120 is connected to the second connection 12 of the control device 110.
  • the circuitry 120 may increase the signal on the second terminal 112 at small dimming levels.
  • Circuitry 120 may selectively increase the signal on second terminal 112 when the dimming level is less than a threshold. As a result, the current control of the operating device 100 is also influenced so that the output current is reduced.
  • control device 1 10 may be configured as an integrated circuit.
  • controller 110 may be configured as a controller, microcontroller, processor or other integrated circuit.
  • ballasts While operating devices and methods of embodiments have been described in detail with reference to the figures, modifications may be made in further embodiments. While, for example, embodiments in the context of phase-dimming or phase-gating dimming, the embodiments are not limited thereto. While a time average of a rectified supply voltage may be used as a basis for determining whether an input signal of the controller should be influenced so as to further reduce the brightness of the light source, other quantities may also be evaluated to determine if the control response is affecting shall be. While embodiments have been described in the context of ballasts with flyback converters, the ballasts may also employ other transformer topologies.
  • Embodiments have been described in detail, in which a regulation is based on variables that are detected on the primary side of the operating device. Feedback of signals across a SELV barrier is not required. In further embodiments, however, a controlled variable can also be detected on the secondary side.
  • Operating devices and methods according to exemplary embodiments can be used, in particular, for the operation of dimmable luminaires, which include LEDs, without being limited thereto.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

Appareil (100) destiné à faire fonctionner un moyen d'éclairage, qui comporte un dispositif de commande (110) servant à commander l'appareil (100) destiné à faire fonctionner le moyen d'éclairage en fonction d'un niveau de variation et un ensemble circuit (120) couplé au dispositif de commande (110). L'ensemble circuit (120) est conçu pour modifier un signal au niveau d'une borne (111, 112) du dispositif de commande (110) lorsque le niveau de variation satisfait à un critère prédéfini.
PCT/AT2013/000190 2012-11-15 2013-11-15 Appareil destiné à faire fonctionner un moyen d'éclairage et procédé permettant de faire varier ledit moyen d'éclairage WO2014075117A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012023244.6 2012-11-15
DE102012023244.6A DE102012023244A1 (de) 2012-11-15 2012-11-15 Betriebsgerät für ein Leuchtmittel und Verfahren zum Dimmen eines Leuchtmittels

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WO2014075117A2 true WO2014075117A2 (fr) 2014-05-22
WO2014075117A3 WO2014075117A3 (fr) 2014-09-04

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EP2592904A1 (fr) * 2007-05-07 2013-05-15 Koninklijke Philips Electronics N.V. Appareil d'éclairage à DEL à haut facteur de puissance et procédés associés
JP2009123681A (ja) * 2007-10-25 2009-06-04 Panasonic Electric Works Co Ltd Ｌｅｄ調光装置
JP4600583B2 (ja) * 2008-09-10 2010-12-15 東芝ライテック株式会社 調光機能を有する電源装置及び照明器具
CN101835314B (zh) * 2010-05-19 2013-12-04 成都芯源系统有限公司 一种具有调光功能的led驱动电路及灯具

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WO2014075117A3 (fr) 2014-09-04
DE102012023244A1 (de) 2014-05-15

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