EP3726936A1 - Appareil pour alimenter des lampes avec un convertisseur résonant - Google Patents

Appareil pour alimenter des lampes avec un convertisseur résonant Download PDF

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Publication number
EP3726936A1
EP3726936A1 EP20166560.1A EP20166560A EP3726936A1 EP 3726936 A1 EP3726936 A1 EP 3726936A1 EP 20166560 A EP20166560 A EP 20166560A EP 3726936 A1 EP3726936 A1 EP 3726936A1
Authority
EP
European Patent Office
Prior art keywords
transformer
circuit
rectifier
bridge
switches
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.)
Pending
Application number
EP20166560.1A
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German (de)
English (en)
Inventor
Jakob Maldoner
Harald Netzer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tridonic GmbH and Co KG
Original Assignee
Tridonic GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tridonic GmbH and Co KG filed Critical Tridonic GmbH and Co KG
Publication of EP3726936A1 publication Critical patent/EP3726936A1/fr
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/39—Circuits containing inverter bridges
    • 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
    • H05B45/345—Current stabilisation; Maintaining constant current
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output

Definitions

  • the present invention relates to an operating device for lighting means, in which the operating voltage or operating current required for the lighting means is generated by means of a resonance converter and in which the current delivered to the lighting means is detected for controlling the resonance converter, as well as a corresponding method for controlling the Control gear.
  • Resonance converters with a series or parallel resonance circuit are often used in control gear to enable energy-efficient operation with low switching losses.
  • the current emitted by the resonance converter can be recorded for the control or regulation of the operating device.
  • the DE 10 2015 223 738 A1 discloses an LLC resonance converter with a transmitter / transformer that generates a direct current for the operation of a light emitting device consisting of light-emitting diodes and in which the current delivered to the light-emitting device is detected indirectly by means of an auxiliary winding of the transformer in order to provide galvanic isolation between the mains voltage side and the Maintain bulbs.
  • the alternating current output by the auxiliary winding is rectified by a rectifier and measured by the control device with a measuring resistor / voltage divider.
  • the determination of the current delivered to the lamp by means of an auxiliary winding magnetically coupled to the primary winding of the transformer is, however, imprecise.
  • the invention is based on the object of specifying devices and methods which reduce the problems described.
  • the object is, in particular, to provide an operating device for lighting means with a resonance converter and a method for controlling an operating device having a resonance converter, which allow precise detection of the current delivered to the lighting means or the voltage supplied to the lighting means with a simple and inexpensive structure.
  • an operating device for operating lighting means comprises a resonance converter for providing a voltage and a current for operating the lighting means, a measuring circuit for detecting the current delivered by the resonance converter to the lighting means and a control device for controlling the resonance converter on the basis of the detected current.
  • the resonance converter consists of at least a half-bridge circuit, a resonance circuit coupled to the half-bridge circuit, and a transformer coupled to the resonance circuit.
  • the measuring circuit has a transformer and a rectifier with at least one controllable switch, with at least one primary winding of the transformer detecting the current output by the secondary winding of the transformer, the rectifier rectifying the current output by the secondary winding of the transformer and the controllable switch based on a is controlled between the two switches of the half-bridge circuit detected signal.
  • the transformer is used for signal transmission to the control device arranged on the primary side for the control of the half-bridge circuit, while maintaining the electrical isolation, whereby the acquisition of the current delivered by the secondary winding of the transformer enables an exact determination of the current delivered to the illuminant.
  • the control of the rectifier on the basis of the signal detected between the two switches of the half-bridge circuit enables, in contrast to control on the basis of the control signals of the switches of the half-bridge circuit, a complete rectification of the current, since no components of the current are caused by the dead time between the control signals conditional delayed switching on are cut off.
  • the secondary winding of the transformer can be connected to a full-wave rectifier, in particular a bridge rectifier, the transformer being connected to the full-wave rectifier or the bridge rectifier and a primary winding for detecting the positive current flowing into the rectifier and a primary winding for detecting the positive current flowing into the rectifier having negative current.
  • the rectifier of the measuring circuit can be a bridge rectifier with four controllable switches.
  • the measuring circuit can have a comparator which compares the detected signal with a predetermined voltage and outputs a switch-on signal to the switches in one branch of the bridge rectifier if the detected signal is above the predetermined voltage and outputs a switch-on signal to the switches in the other branch of the bridge rectifier when the detected signal is below the specified voltage.
  • the switches of one branch of the bridge rectifier can be PNP transistors and the switches of the other branch of the bridge rectifier can be NPN transistors.
  • the resonance converter can be an LLC resonance converter.
  • a bridge rectifier can be connected to the secondary winding of the transformer, the positive current flowing through the bridge rectifier being detected by means of a first primary winding of the transformer and the negative current flowing through the bridge rectifier being detected by a second primary winding of the transformer.
  • the rectification of the current delivered by the secondary winding of the transformer can be done by means of a bridge rectifier with four controllable switches.
  • the detected signal can be compared with a predetermined voltage, a switch-on signal being output to the switches in one branch of the bridge rectifier if the detected signal is above the predetermined voltage, and a switch-on signal is output to the switches in the other branch of the bridge rectifier when the detected signal is below the specified voltage.
  • Fig. 1 shows a simplified schematic representation of an operating device 1 according to an embodiment of the present invention.
  • the operating device 1 is used to operate a lighting means 4 connected to its output connections 2, 3, which can comprise a light-emitting diode (LED, OLED) or several LEDs or OLEDs connected in series or in parallel.
  • LED light-emitting diode
  • OLED light-emitting diode
  • a supply voltage which can be an AC mains voltage of 230 volts, is fed to the two input connections L, N of the operating device 1 shown.
  • the operating device 1 has a power factor correction circuit 5 connected to the input connections L, N, a resonance converter 6 connected to the output connections 2, 3, a measuring circuit 7 and a control device 8 which controls at least the resonance converter 6.
  • the power factor correction circuit 5 is used to provide the operating voltage for the resonance converter 6 at the circuit points 9 and 10, which can be a direct voltage of 400 volts, and to correct the power factor (so-called power factor correction), in which the switching times of the with a pulse-width modulated control voltage switched on and off switch of a DC voltage converter are selected so that the input current of the circuit follows a sinusoidal curve that is in phase with the curve of the AC mains voltage, from which the supply of the operating voltage is achieved.
  • Fig. 2 shows a simplified circuit of the resonance converter 6, which comprises a primary-side part 11 and a secondary-side part 12, which are coupled via a potential barrier 15 by means of a transformer having a primary coil 13 and a secondary coil 13.
  • the potential barrier 15 is used for galvanic separation (protective separation) from the mains voltage side with a grounded star point.
  • the primary-side circuit part 11 comprises an LLC resonant circuit which is designed as a series resonant circuit and has a capacitance 16, a first inductance 17 and the primary coil 13 as a second inductance 30 in a series circuit, as well as a half-bridge with a first switch 18 and a second switch 19
  • the operating voltage provided by the power factor correction circuit 7 at the connection points 9 and 10 is applied to the half bridge, the first switch 18 being connected to the connection point 9 and the second switch 19 to the connection point 9.
  • the LLC resonant circuit is connected to node 9 and the center M of the half bridge between the two switches 18 and 19, i.e. the series resonant circuit is connected in parallel with the second switch 19 and in series with the first switch 18.
  • the secondary-side circuit part 12 has a bridge rectifier connected to the secondary coil 14 and formed by four diodes 20..23 and a buffer capacitor 24 connected downstream of the bridge rectifier and connected in parallel to the output connections 2, 3.
  • a full-wave rectifier with two diodes can be used, the center of the secondary coil 14 being connected to the output connection 3 and the ends of the secondary coil 14 being connected to the output connection 2 via the two diodes.
  • the resonance converter 6 converts the operating voltage provided by the power factor correction circuit 5 at the circuit points 9 and 10 into a desired direct voltage or a direct current for the lighting means 4.
  • the control device 8 controls the first switch 18 and the second switch 19 in such a way that only one of the two switches is always switched on.
  • Each of the switches 18, 19 can be switched with the same switching frequency, the switching frequency with which the switches 18, 19 are switched clocked is changed to change the brightness (dimming level) of the lighting means 4 connected to the output connections 2, 3 .
  • a specification for the assignment of a dimming level to a corresponding switching frequency can be specified by the manufacturer or user, if necessary, for different lighting means that represent different loads and e.g. get saved.
  • the measuring circuit 7 shown has a transformer consisting of two primary windings 25, 26 and a secondary winding 27 and a controllable rectifier 28.
  • one of the two primary windings 25, 26 is arranged in a branch of the bridge rectifier formed by the four diodes 20..23 and the current of the respective rectifier branch flows through it, the primary winding 25 being connected between the output of the diode 22 and the output terminal 2 and primary winding 26 is connected between the output of diode 20 and output terminal 2.
  • the current flowing alternately in the two primary windings 25, 26 is detected by the secondary winding 27 across the potential barrier 15 and rectified by the controllable rectifier 28 of the measuring circuit 7.
  • the rectifier 28 is controlled on the basis of the voltage profile across the LLC resonant circuit, which, depending on the winding direction of the transformer, is proportional or inversely proportional to the profile of the current output by the secondary winding 27.
  • the measuring circuit 7 detects the voltage between the center M of the half-bridge and the circuit point 10, which can be ground, and determines from this the switch-on and / or switch-off times of the controllable rectifier 28 to completely and without the current output by the secondary winding 27 that components in the current curve are cut off due to being switched on too late and / or switched off too early and are therefore not measured. If the rectifier 28 is switched on too late, for example, if the rectifier 28 is controlled by means of the switch-on signals S1, S2 sent by the control device 8 to the first switch 18 and the second switch 19, due to the dead time between the switch-on signals S1, S2.
  • Fig. 3 shows the voltage profile of the switch-on signal S1 of the switch 18, the voltage profile of the switch-on signal S2 of the switch 19, the profile of the current i D20 through the diode 20 and the profile of the current i D22 through the diode 22 for the converter operated below the resonance frequency, the Switch 18 is only activated or opened during time period T 1 and switch 19 is only activated during time period T 2 .
  • the rectifier 28 is driven on the basis of the switch-on signal S1 and / or S2 the front part iF D20 of the course of the current i D20 and the front part iF D22 of the course of the current i D22 are cut off and thus not detected by the measuring circuit 7.
  • Fig. 4 additionally shows the profile of the voltage u M between the center M of the half bridge and the circuit point 10. As shown in FIG Fig. 4 As can be seen, the voltage u M rises before the rise in the current i D20 and falls after the current i D20 has fallen to zero. The course of the voltage u M is recorded by the measuring circuit 7 and used to control the rectifier 28 in order to completely record the current output by the secondary winding 27.
  • Fig. 5 shows a simplified schematic representation of a measuring circuit 7 according to an embodiment of the present invention.
  • the measurement circuit 7 shown has a comparator formed from a diode 29 and three resistors R1, R2, R3, a bridge rectifier formed from four switches 30..33 and connected to the secondary winding 27, a switch 34 for inverting the switch control signal and a measuring resistor R4 .
  • the switches 18, 19 and 30..34 can be transistors, in particular metal-oxide-semiconductor field effect transistors (MOSFET).
  • MOSFET metal-oxide-semiconductor field effect transistors
  • the in Fig. 4 shown comparison voltage U s of, for example, 12 volts and the diode 29 is non-conductive when the voltage u M is greater than 12 volts.
  • a switch-on signal of approximately 12 volts is applied to the switches 30, 31 of a branch of the bridge rectifier and the switch 34, so that the switches 30, 31, 34 switch on or remain switched on during the time period T 3 and the switch that is switched on 30 prevents the switches 32, 33 of the other branch of the bridge rectifier from being switched on.
  • the diode 29 becomes conductive when the voltage u M is less than 12 volts, as a result of which the switch-on signal of the switches falls to zero, so that the switches 30, 31, 34 switch off or remain switched off.
  • the resistors R1, R2, R3 are dimensioned such that when the diode 29 is conducting, a switch-on signal is applied to the switches 32, 33 of the other branch of the bridge rectifier and these switch on or remain switched on during the period T 4 .
  • the bridge rectifier is thus clocked or controlled with the rising and falling curve of the voltage u M with respect to the comparison voltage U s . Since the time course of the secondary winding 27 The current output and supplied to the bridge rectifier is proportional to the voltage curve, the two rectifier branches are switched at the correct time.
  • the current output by the secondary winding 27 and rectified by the bridge rectifier of the measuring circuit 7 is detected at the switching point 36 by the control device 8 by means of a measuring resistor R4, which controls or regulates the resonance converter 6 on the basis of the detected current.
  • a deviation between the detected current and a predetermined value can be determined and the resonance converter 6 can be controlled in such a way that the determined deviation is reduced.
  • the control device 8 can be designed as a processor, a microprocessor, a controller, a microcontroller or an application-specific special circuit (ASIC, “Application Specific Integrated Circuit”) or a combination of the named units.
  • ASIC Application Specific Integrated Circuit
  • the branches of the bridge rectifier of the measuring circuit 7 each have transistors with different polarity, such as NPN transistors for the switches 30, 31 and PNP transistors for the switches 32, 33.
  • a midpoint two-way rectifier with two switches can be used.
  • Fig. 6 shows a simplified flow chart of the method according to the present invention, in which the sequence described in detail above is shown again with its essential points.

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EP20166560.1A 2019-04-15 2020-03-30 Appareil pour alimenter des lampes avec un convertisseur résonant Pending EP3726936A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019109873.4A DE102019109873A1 (de) 2019-04-15 2019-04-15 Betriebsgerät für Leuchtmittel mit einem Resonanzwandler

Publications (1)

Publication Number Publication Date
EP3726936A1 true EP3726936A1 (fr) 2020-10-21

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Application Number Title Priority Date Filing Date
EP20166560.1A Pending EP3726936A1 (fr) 2019-04-15 2020-03-30 Appareil pour alimenter des lampes avec un convertisseur résonant

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EP (1) EP3726936A1 (fr)
DE (1) DE102019109873A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070273304A1 (en) * 2006-05-26 2007-11-29 Simon Richard Greenwood High intensity discharge lamp ballast
DE102013224749A1 (de) * 2013-12-03 2015-06-03 Tridonic Gmbh & Co Kg Treiberschaltung für Leuchtmittel insbesondere LEDs
DE102014214746A1 (de) * 2014-07-28 2016-01-28 Tridonic Gmbh & Co Kg Aktive Schaltung zur Erfassung eines Leuchtmittel-Stroms
DE102015223738A1 (de) 2015-11-30 2017-06-01 Tridonic Gmbh & Co Kg LLC-Treiberschaltung mit Dämpfungsglied
DE102016114675A1 (de) * 2016-08-08 2018-02-08 Infineon Technologies Ag Modulierte Stromversorgung
DE102017210165A1 (de) * 2017-06-19 2018-12-20 Robert Bosch Gmbh Mehrfach-Transistor-Anordnung, Brückengleichrichter und Verfahren zur Herstellung einer Mehrfach-Transistor-Anordnung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070273304A1 (en) * 2006-05-26 2007-11-29 Simon Richard Greenwood High intensity discharge lamp ballast
DE102013224749A1 (de) * 2013-12-03 2015-06-03 Tridonic Gmbh & Co Kg Treiberschaltung für Leuchtmittel insbesondere LEDs
DE102014214746A1 (de) * 2014-07-28 2016-01-28 Tridonic Gmbh & Co Kg Aktive Schaltung zur Erfassung eines Leuchtmittel-Stroms
DE102015223738A1 (de) 2015-11-30 2017-06-01 Tridonic Gmbh & Co Kg LLC-Treiberschaltung mit Dämpfungsglied
DE102016114675A1 (de) * 2016-08-08 2018-02-08 Infineon Technologies Ag Modulierte Stromversorgung
DE102017210165A1 (de) * 2017-06-19 2018-12-20 Robert Bosch Gmbh Mehrfach-Transistor-Anordnung, Brückengleichrichter und Verfahren zur Herstellung einer Mehrfach-Transistor-Anordnung

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