• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a luminous flux converter with an LLC resonant circuit, wherein starting from its secondary side bulbs (LED), such. an LED path, wherein the LLC resonant circuit comprises a half-bridge circuit (HB) with two switches (S1, S2) connected in series, which are controlled by a control circuit (SE) and one starting from a center point (M1) the two switches (S1, S2) supplied resonant circuit (RK), and fed from an output of the resonant circuit (RK) with AC voltage transformer (T1), on the secondary side of each a current path (SP1, SP2) for each of the two Polarity of the AC voltage is provided, wherein a detection circuit (ES) is provided which detects a signal (V1, V2), the currents (ISP1, ISP2) in the two current paths (SP1, SP2) and / or their relationship reflects, and the control circuit (SE) sets the timing of the two switches (S1, S2) of the half-bridge circuit (HB) depending on the detected by the detection circuit (ES) signal (V1, V2).
    公开号:AT16368U1
    申请号:TGM201/2015U
    申请日:2015-07-07
    公开日:2019-07-15
    发明作者:
    申请人:Tridonic Gmbh & Co Kg；
    IPC主号:
    专利说明:

    description
    LUMINAIRE CONVERTER WITH SYMMETRIZED OUTPUT CURRENTS The invention relates to a lamp converter for operating at least one lamp, preferably at least one LED or LED path. In addition, the invention relates to a method for operating a light center converter. The invention further relates to a lamp converter with an LLC circuit, in which a (series) resonance circuit is supplied starting from an AC voltage, which in turn serves to supply a further converter stage for the direct supply of a lamp. The supply voltage supplied to the illuminant must then typically be converted into a DC voltage. In principle, this can be done, for example, using a full bridge rectifier. With regard to energetic advantages, however, rectification starting from a transformer is possible.
    [0002] A “lamp converter is an electrical circuit that can be supplied with an input voltage and can be connected to the lamps, such as one or more LEDs, in order to be electrically operated in a defined manner.
    Document WO 2014/060899 A2 is known from the prior art, for example, in which a lamp converter is described in FIG. 1, which can serve as the starting point for the invention. A similar illuminant converter is also shown in FIG. 1. A control circuit SE controls an inverter half bridge HB with two switches S1, S2, which are connected in series. As shown in Fig. 1, the half-bridge circuit HB is supplied by an input voltage, which is shown as an example as bus voltage V B us. Instead of a bus voltage, which is normally a DC voltage, i.e. a DC voltage, a rectified AC voltage can also be used to supply the half-bridge.
    Starting from a center point of the half-bridge HB, or the two switches S1, S2, a resonance circuit is now supplied, which is formed in particular from a series connection of a capacitor C1, an inductor L1 and a second inductor L2a. Starting from the inductance L2a, a transformer T1 with an alternating voltage, i. H. an AC voltage. The transformer T1 has the electromagnetic inductances, coils or windings L2a, L2b, L2c. The inductors L2b and L2c are arranged on the secondary side of the transformer T1. The inductors L2b and L2c are shown as separate inductors, since a center tap M1 is provided on the secondary side of the transformer T1.
    Starting from the inductors L2b and L2c, a current path SP1 or SP2 is then supplied in each case. The current paths SP1 and SP2 thus each connect one side of the inductance L2b, L2c to a connection point CP, each current path having a diode for rectification.
    The first current path SP1 has the diode D1, while the second current path SP2 has a second diode D2. An induced current I S pi is transmitted via the first current path SP1, and an induced current I SP2 is transmitted via the current path SP2 . On the other hand, the connection point CP connects an output connection E1 of the lamp converter to which, for example, a load LED, for example a lamp and in particular at least one LED, can be connected.
    Between the connection point CP and the output terminal El, a smoothing capacitor C2 is further connected to its higher potential side, the lower potential side of the second capacitor C2 being able to lie on the secondary ground potential of the transformer.
    The control circuit SE controls the higher potential switch S1 of the half bridge HB via a control signal HS ("high side signal), while it controls the lower potential switch S2 of the half bridge with a signal LS (" low side signal). The / 12
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    Control circuit SE, the switches S1, S2, which are preferably used as transistors, for. B. FET, MOSFET, are formed alternately to provide an alternating voltage for the transformer T1 at the center of the half bridge HB.
    In Fig. 1, the primary winding L2a of the transformer T1 is connected on its lower-potential side to the primary-side ground, as is the lower-potential side of the half-bridge switch S2. The current or the voltage through the inductor L2a on the primary side is transmitted through the transformer T1 to the secondary side, as a result of which the current I S pi is induced in the first current path SP1 and the current I S p 2 is induced in the second current path SP2.
    The center tap between the secondary inductors L2b and L2c, however, serve to provide currents or voltages at the connection point CP which are essentially symmetrical about a zero point.
    Via the diodes D1 and D2, a direct current or a direct voltage is provided at the connection point CP in order to operate the load LED. The secondary mass can either be connected to the primary mass or can be provided in isolation from it.
    Overall, the voltage at the output terminal E1 or the current l S pi or l S p 2 depends on the voltage applied to the primary-side inductance of the transformer T1 or the waveform of the voltage. These can be set by changing a clocking or switching frequency of the switches S1, S2 or a duty cycle of the half-bridge circuit HB, ie in particular a change in the switch-on time of the switches S1, S2.
    Starting from the circuit shown in Fig. 1, the problem now arises that the inductors L2b, L2c on the secondary side of the transformer T1 (which in particular represent two halves of a single secondary-side inductor) are not exactly symmetrical and are not the same have electrical or symmetrical parameters. This leads to an asymmetrical loading of the components following on the secondary side of the transformer T1 and in particular of the diodes D1 and D2. It can even happen that only one current path of the current paths SP1, SP2 and thus a diode D1 / D2 is loaded.
    The invention now provides a solution that allows, even with unequal or asymmetrical inductors L2b, L2c on the secondary side of the transformer T1, an exact form of symmetry of the currents output on the secondary side, i. H. to achieve the current at the connection point CP or at the output terminal E1. For this purpose, the invention provides a lamp converter and a method for operating a lamp converter according to the independent claims. Further developments of the invention are the subject of the dependent claims.
    In a first aspect, a lamp converter with an LLC resonance circuit is provided, starting from the secondary side of lamps, such as an LED line, can be supplied, the LLC resonance circuit having: a half-bridge circuit with two switches connected in series, which are controlled by a control circuit, a resonance circuit supplied from a center point of the two switches, and one from an output of the resonance circuit with AC Voltage-fed transformer, on the secondary side of which a current path is provided for each of the two polarities of the AC voltage. A detection circuit is provided that detects a signal that reflects currents in the two current paths and / or their ratio, and the control circuit adjusts the timing of the two switches of the half-bridge circuit depending on the signal detected by the detection circuit.
    [0016] The detection circuit can have at least one detection branch which detects the signal representing the current through at least one signal path.
    [0017] The at least one detection branch can evaluate a rectified mixed signal.
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    Patent Office [0018] The at least one detection branch can have a sample and hold circuit.
    [0019] The detection circuit can have a detection branch for each current path.
    The at least one detection branch can have a switch which is clocked synchronously with one of the two switches of the half-bridge circuit.
    At the at least one detection branch, a voltage and / or a voltage value can be detected, which is proportional to the current through one of the current paths.
    The control circuit can, depending on the signal supplied to the control circuit, change a duty cycle of the half-bridge circuit and, in particular, shorten or lengthen an on-period of at least one of the two switches of the half-bridge circuit.
    [0023] The secondary side of the transformer can have a winding with center tap coupled to a primary-side winding of the transformer, from which the current paths are supplied.
    [0024] Each current path can have a detection inductance which is electromagnetically coupled to at least a third detection inductance of the detection circuit. The at least one detection branch of the detection circuit can be arranged between a rectifier and filter circuit.
    The control circuit can change the control of the two switches of the half-bridge circuit by changing the timing until the signal supplied to the control circuit corresponds to a desired value and / or signals supplied to the control circuit are in particular essentially the same, e.g. have the same signal values.
    The control circuit can change the control of the two switches of the half-bridge circuit by changing the timing until a desired value for a signal supplied to the control circuit is reached, which in particular represents a ratio of two voltage values.
    The detection circuit can have two detection branches, the switches of which are each clocked synchronously with one of the two switches of the half-bridge circuit.
    The detection circuit can supply the control circuit with two signals, each of which indicates an electrical parameter reflecting the current through a current path, and / or can relate the two signals and transmit information about the relationship to the control unit.
    In a further aspect, a method for symmetrizing the current flows at the output of an LLC resonance circuit based on the secondary side of illuminants, such as e.g. an LED path can be supplied, the LLC resonance circuit, a control circuit controlling two series-connected switches of a half-bridge circuit, and the half-bridge circuit supplying a resonance circuit starting from a center point of the two switches and starting from an output of the resonance circuit a transformer is supplied with AC voltage, on the secondary side of which a current path is provided for each of the two polarities of the AC voltage. A detection circuit detects a signal that reflects currents in the two current paths and / or their ratio, and the control circuit adjusts the timing of the two switches of the half-bridge circuit depending on the signal detected by the detection circuit.
    The invention will now be described with reference to the figures. Show:
    Fig. [0033] Fig. [0034] Fig. [0035] Fig. A circuit arrangement according to the prior art;
    schematically a circuit arrangement according to the invention;
    an example of a circuit arrangement according to the invention;
    exemplary acquisition values.
    shows schematically a circuit according to the invention. Starting from one
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    Supply V, in particular a DC voltage or a rectified AC voltage, e.g. a rectified mains voltage, a half-bridge circuit HB is supplied, which supplies a resonance circuit RK with an alternating voltage.
    The half-bridge, as described for FIG. 1, preferably has at least two switches S1 and S2 connected in series, which are controlled by a control unit SE. The potential higher switch can be controlled via the control signal HS and the potential lower switch via the control signal LS.
    The resonant circuit RK is connected to the primary winding of the transformer T1. Starting from the secondary winding of the transformer T, which has a center tap that quasi divides the secondary inductance into two inductors, at least one current path is supplied. A detection circuit ES is now integrated into this current path, which detects at least one signal that represents the current in the at least one current path, preferably the currents in two current paths or their ratio. Information representing the signal or the signals or the ratio is then fed to the control circuit SE, which, depending on this, changes a duty cycle or a clocking of the switches of the inverter HB by changing the control signals HS and / or LS.
    2 shows the signals V1 and V2 which are supplied from the detection circuit ES to the control circuit SE. It should be understood that if only a signal representing the ratio of the current values or only a signal is transmitted to the control unit SE, only this signal has to be supplied from the detection circuit ES to the control circuit SE. Starting from the transformer T, the load LED can be supplied with electricity.
    Details of the circuit according to the invention will now be seen with reference to Figs. 3a and 3b.
    In Fig. 3A, essentially a circuit corresponding to Fig. 1 is shown. Correspondingly, the same reference numerals from FIG. 1 also designate essentially identical parts of the circuit in FIG. 3a. The electrical supply V is again shown in FIG. 3a as voltage V BU s. The main difference here is that a first detection inductance L3a is connected in the first current path SP1 between the diode D1 and the connection point CP. Furthermore, a second detection inductance L3b is provided in the second current path SP2 between the diode D2 and the connection point CP. Electromagnetically coupled to the first and second detection inductors L3a and L3b is a third detection inductance L3c, which is preferably on the primary side with respect to the resonance circuit RK or the LLC resonance circuit or the transformer T1.
    The first detection inductance L3a and the second detection inductance L3b form with the third detection inductance L3c the converter W1 and in particular a further transformer. At the third detection winding L3c, therefore, a current dependent on the current through the first detection winding L3a is detected when a current I S pi flows through the first current path SP1, while a current depending on the current I S p 2 through the second current path SP2 is detected when the current I S P2 flows through the second current path SP2. A current path for the induced currents is consequently provided for each polarity of the primary-side AC voltage on the secondary side.
    The current detected at the third detection winding L3c is then fed to a rectifier GR, which then outputs a rectified current I sense . According to the invention, the current signal I sense is now evaluated with regard to asymmetry of the current component by the current paths SP1, SP2 or by the diodes D1, D2.
    As shown in Fig. 3b, the current signal I sense is fed from the rectifier to a known filter circuit FS, consisting of a filter resistor RF, a filter capacitance CF and a touch resistor Rsens, and evaluated with regard to averaging, so that ultimately the mean l sense avg of the current flowing on the secondary side of the transformer T1 as a signal representative of the regulation of the LED current
    AT16 368U1 2019-07-15 Austrian
    Patent office can be tet. The mean value signal l sense avg is then used for current regulation, it being used as an actual signal and as a manipulated variable for clocking the switches S1, S2 of the inverter HB. Correspondingly, the mean value signal l sense avg is fed to the control circuit SE as a signal (3).
    According to the invention, it is now provided that the combined current signal I sense is split into values which are representative of the current through the current paths SP1 and SP2, or the currents occurring at the diodes D1 and D2, before the averaging. For this purpose, a first detection branch EZ1 is provided, consisting of a series circuit comprising a third switch S3, which is connected with its potential higher side to the rectifier GR and the filter resistor RF, and a first resistor RH1 and a first capacitor CH1 are formed. Between the first resistor RH1 and the first capacitor CH1, a voltage signal V1 is detected, which represents the voltage drop across the first capacitor CH1.
    A second detection branch EZ2 from a series circuit of a fourth switch S4, a second resistor RH2 and a second capacitor CH2 is also connected between the rectifier GR and the filter circuit. The higher potential connection of the fourth switch S4 is connected to the rectifier GR and the filter resistor R F , while its lower potential side is connected to one side of the second resistor RH2. On the other side of the second resistor RH2, the second capacitance CH2 is connected, which on the other hand is at a ground potential. Between the second resistor RH2 and the second capacitance CH2, the measurement signal V2 is recorded, which represents a voltage drop across the second capacitance CH2.
    In the first detection branch EZ1 the current I2 flows when the third switch S3 is activated, in the second detection branch EZ2 the current I2 flows when the fourth switch S4 is activated.
    It is now crucial that the third switch S3 and the fourth switch S4 are controlled synchronously with the switches S1, S2 of the half-bridge HB. For example, the third switch S3 is controlled synchronously with the potentially higher switch of the half bridge S1, while the fourth switch S4 is controlled synchronously with the potential lower switch S2 of the half bridge HB. Correspondingly, the third switch S3 is controlled by the control circuit SE with the control signal HS, while the fourth switch S4 is controlled by the control signal LS, or vice versa.
    The basic idea of the invention is that the currents through the diodes D1 and D2 can be evaluated separately. In the present case, the current signal I sense is subsequently split, since the combination of the two currents I S P2 and I S pi is already provided for averaging.
    Alternatively, a separate coupled third or fourth detection inductor could also be provided for evaluation for the first detection inductance L3a and for the second detection inductance L3b. A corresponding voltage or current signal could then also be conveyed to the control circuit SE. It can further be provided that the detection circuit ES determines a ratio from the detection signals V1 and V2 and transmits this as a single signal to the control circuit SE. For this purpose, a corresponding circuit for forming the ratio value can be provided in the detection circuit ES.
    Knowing the at least one signal which is supplied from the detection circuit ES to the control circuit SE and which reproduces the currents through the diodes D1 and D2, an asymmetry of the secondary-side inductances L2b, L2c of the transformer T1 in cannot now mechanically, but in a control-technical manner, by using the supplied value for changing the timing of the half-bridge switches S1, S2 and in particular for changing the duty cycle (or duty cycle) of the half-bridge HB by means of a feedback control for this asymmetry.
    In the exemplary embodiment shown in FIG. 3b, the detection signals V1 and V2,
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    Patent office are the corresponding voltage signals that represent the currents through the diodes D1 and D2, evaluated by the control circuit SE (in particular IC, ASIC, microcontroller), which then controls the switches S1, S2 of the half-bridge HB accordingly. In addition, it can be provided that the detection circuit ES has its own microcontroller, ASIC or IC, which feeds the feedback signal to a further control unit, whereupon this control unit then changes the control of the inverter switches S1, S2.
    The resonance circuit or the LLC resonance circuit is used with the transformer T1 with center tap to achieve a somewhat higher efficiency. The problem solved by the invention thus addresses that, depending on the operating point, the current through the secondary windings L2b, L2c can be different. In particular, the invention prevents the entire output current of the transformer T1 via only one of the current paths SP1, SP2, i.e. H. flows through one of the secondary inductors L2b, L2c, which also represents a considerable electrical and thermal load on the transformer T1. While typically the half bridge HB operates with a duty cycle of 50%, i. H. that the switches S1, S2 of the half-bridge are essentially equally active, taking into account a dead time, the solution according to the invention compensates for any asymmetry by correcting the duty cycle of the half-bridge HB and in particular one Switch-on time and / or switch-off time of the half-bridge switches S1, S2 is changed.
    [0053] Figs. 4a-c show schematically how, in the case of an asymmetry with essentially the same control of the half-bridge switches S1, S2 by the control signals LS and HS, different currents can result in the current paths SP1, SP2.
    While the detection circuit ES on the first detection branch EZ1 determines the detection signal V1 when, as shown in Figs. 4a and 4b, the switch S1 and the third switch S3 are activated by actuation by means of the signal HS, the second detection branch EZ2 determines the detection signal V2 when, as shown in FIGS. 4a and 4c, the switch S2 and the fourth switch S4 are activated by control by means of the signal LS.
    Correspondingly, as shown in FIG. 4d, a deviation AV results from the detection signals V1 and V2, which reflects the asymmetry. Correspondingly, by changing the control of the half-bridge switches S1, S2 by changing the control signals LS, HS, a change in the currents I S pi, I SP 2 in the current paths SP1, SP2 can be generated.
    In particular, the variable AV can be used as the actual variable for the asymmetry, which can then serve the control circuit SE, which is responsible for the control of the half-bridge switches S1, S2.
    The current of the secondary inductors L2b, L2c of the transformer T1 is thus detected via the detection inductors L3a to L3c. As shown in FIG. 3b, this AC signal is rectified by means of a rectifier GR, in particular a bridge rectifier. By clocking the switches of the detection branches EZ1, EZ2 you then get the signals V1, V2, as shown in Figs. 4b and 4c are shown. The current in the inductors L3a to L3c behaves synchronously with the switching of the half-bridge switches S1, S2, which are controlled via the control signals LS and HS.
    It should be noted that the first resistor RH1 and the first capacitor CH1 are a sample-and-hold circuit. The same is the case for the second resistor RH2 and the second capacitance CH2. Thus, the measurement signal detected via the third or fourth switch S3, S4 is supplied to a sample and hold stage. This creates the detection signal V1, that is the voltage V1 at the detection point (1), while the detection signal V2 or the voltage signal at the detection point (2) arises, the signal at point (1) being proportional to the current through the first detection inductance L3a, while the detection signal V2 is proportional to the current through the second detection inductor L3b.
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    The detection signals can then be evaluated, for example, with the analog digital converter of a microcontroller, which then changes the duty cycle of the inverter HB until the detection signal V1 at point (1) corresponds to the detection signal V2 at point (2).
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    权利要求:
    Claims (12)
    [1]
    Expectations
    1.Luminant converter with an LLC resonance circuit, starting from the secondary side of the illuminant (LED), e.g. an LED path, can be supplied, the LLC resonance circuit having:
    - a half-bridge circuit (HB) with two switches (S1, S2) connected in series, which are controlled by a control circuit (SE),
    - a resonance circuit (RK) supplied from a center point (M1) of the two switches (S1, S2), and
    - Starting from an output of the resonance circuit (RK) fed with AC voltage transformer (T1), on the secondary side of which a current path (SP1, SP2) is provided for each of the two polarities of the AC voltage, characterized in that a detection circuit (ES) is provided, which detects a signal (V1, V2), the currents (I S pi, Isp2) in the two current paths (SP1, SP2) and / or their ratio, and that the control circuit (SE) the clocking of the two switches (S1, S2) of the half-bridge circuit (HB) depending on the signal (V1, V2) detected by the detection circuit (ES).
    [2]
    2. Illuminant converter according to claim 1, characterized in that the detection circuit (ES) has at least one detection branch (EZ1) which detects the signal representing the current through a signal path (SP1).
    [3]
    3. Illuminant converter according to claim 2, characterized in that the at least one detection branch (EZ1) evaluates a rectified signal (I sense ); and / or that the at least one detection branch (EZ1) has a sample and hold circuit (S3, RH1, CH1).
    [4]
    4. Illuminant converter according to one of claims 2 or 3, characterized in that the detection circuit (ES) for each current path (SP1, SP2) has a detection branch (EZ1, EZ2).
    [5]
    5. Illuminant converter according to one of claims 2 or 3, characterized in that the at least one detection branch (EZ1) has a switch (S3, S4) which is synchronously clocked with one of the switches (S1, S2) of the half-bridge circuit (HB) is; and / or that the at least one detection branch (EZ1) detects a voltage and / or a voltage value that is proportional to the current through the current path (SP1).
    [6]
    6. Lamp converter according to one of the preceding claims, characterized in that the control circuit (SE) changes a pulse duty factor of the half-bridge circuit (HB) depending on the signal (V1, V2) supplied to the control circuit (SE) and in particular a switch-on period of at least one of the shortened or lengthened both switches (S1, S2) of the half-bridge (HB); and / or that the control circuit (SE) changes the control of the two switches (S1, S2) of the half-bridge circuit (HB) by changing the timing until the signal (V1, V2) supplied to the control circuit (SE) corresponds to a desired value and / or signals (V1, V2) fed to the control circuit are in particular essentially the same, for example have the same signal values; and / or that the control circuit (SE) changes the control of the two switches (S1, S2) of the half-bridge circuit by changing the timing until a desired value for the signal (V1, V2) supplied to the control circuit (SE) is reached, that reproduces in particular a ratio of two voltage values.
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    [7]
    7. Lamp converter according to one of the preceding claims, characterized in that each current path (SP1, SP2) has a detection inductance (L3a, L3b) which are electromagnetically coupled to at least a third detection inductance (L3c) of the detection circuit (ES).
    [8]
    8. Lamp converter according to one of claims 2 to 7, characterized in that the at least one detection branch (EZ1) of the detection circuit (ES) is arranged between a rectifier (GR) and filter circuit (FS).
    [9]
    9. Lamp converter according to one of the preceding claims, characterized in that the detection circuit (ES) has two detection branches (EZ2, EZ2), the switches (S3, S4) synchronously with one of the two switches (S1, S2) of the half-bridge circuit (HB) are clocked; and / or that the detection circuit (ES) supplies the control circuit (SE) with two signals (V1, V2), each of which indicates an electrical parameter reflecting the current (I SP i, I SP 2) through a current path (SP1, SP2), and / or sets the two signals (V1, V2) in a relationship and transmits information about the relationship to the control unit (SE).
    [10]
    10. A method for symmetrizing the current flows at the output of an LLC resonance circuit, starting from its secondary side, illuminants, such as an LED section, can be supplied, the LLC resonance circuit, a control circuit (SE) having two switches (S1, S2) connected in series ) drives a half-bridge circuit (HB), and the half-bridge circuit (HB) supplies a resonance circuit (RK) starting from a center point (M1) of the two switches (S1, S2), and a transformer (starting from an output of the resonance circuit (RK)) T1) is fed with AC voltage, on the secondary side of which a current path (SP1, SP2) is provided for each of the two polarities of the AC voltage, characterized in that a detection circuit (ES) detects a signal (V1, V2) that detects currents (I S pi, Isp2) in the two current paths (SP1, SP2) and / or their ratio, and the control circuit (SE) depends on the timing of the two switches (S1, S2) of the half-bridge circuit (HB) gig from the signal (V1, V2) detected by the detection circuit (ES).
    With 3 sheets of drawings
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    1.3
    Fig. 1
    Fig. 2
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    2/3 sns
    Fig. 3
    [11]
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    3.3
    Δ Βί Δ
    Fig. 4
    [12]
    12/12
    11¾¾. Austrian patent office
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    DE102012224200A1|2012-12-21|2014-06-26|Tridonic Gmbh & Co. Kg|Importer registration for lighting equipment|
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    DE102013224749A1|2013-12-03|2015-06-03|Tridonic Gmbh & Co Kg|Driver circuit for lamps, in particular LEDs|EP3754829A1|2019-06-18|2020-12-23|Tridonic GmbH & Co. KG|Llc circuit|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102015206982.6A|DE102015206982A1|2015-04-17|2015-04-17|Bulb converter with balanced output currents|US15/537,930| US10064249B2|2015-04-17|2016-04-13|Converter for light sources|
    CN201680006311.6A| CN107211496B|2015-04-17|2016-04-13|Light emitting device converter and method of balancing current flow at output of resonant circuit|
    PCT/AT2016/050093| WO2016164949A1|2015-04-17|2016-04-13|Converter for light sources|
    EP16722771.9A| EP3284319B1|2015-04-17|2016-04-13|Converter for light sources|
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