WO2018206294A1 - Circuit de convertisseur á récuperation conçu pour faire fonctionner des sources lumineuses avec contrôle de la valeur de courant de crête et détection de la valeur moyenne de courant - Google Patents

Circuit de convertisseur á récuperation conçu pour faire fonctionner des sources lumineuses avec contrôle de la valeur de courant de crête et détection de la valeur moyenne de courant Download PDF

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Publication number
WO2018206294A1
WO2018206294A1 PCT/EP2018/060638 EP2018060638W WO2018206294A1 WO 2018206294 A1 WO2018206294 A1 WO 2018206294A1 EP 2018060638 W EP2018060638 W EP 2018060638W WO 2018206294 A1 WO2018206294 A1 WO 2018206294A1
Authority
WO
WIPO (PCT)
Prior art keywords
switch
flyback converter
converter circuit
transformer
current
Prior art date
Application number
PCT/EP2018/060638
Other languages
German (de)
English (en)
Inventor
Blazej Szyler
Juan MORÍS-GÓMEZ
Original Assignee
Tridonic Gmbh & 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 & Co Kg filed Critical Tridonic Gmbh & Co Kg
Priority to DE112018002417.2T priority Critical patent/DE112018002417A5/de
Publication of WO2018206294A1 publication Critical patent/WO2018206294A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/34—Snubber circuits
    • H02M1/348—Passive dissipative snubbers
    • 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]
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source

Definitions

  • the present invention relates to a clocked flyback converter circuit and a method for controlling a clocked flyback converter circuit.
  • the invention relates to a clocked flyback converter for direct operation of one or more light-emitting diodes.
  • a flyback converter also called a flyback converter, is a DC-DC converter that galvanically decouples electrical energy between an input and an output side by means of a transformer be converted into a DC voltage with a different voltage level.
  • a clocked flyback converter circuit in which a control device selectively switches a the primary coil of the transformer coupling to ground switch for clocking the flyback converter with a specific frequency and duty cycle and off again.
  • the US 2014/0153292 Al proposes to use such a clocked flyback converter circuit for direct supply of light emitting diodes (LEDs), wherein the current flowing through the controllable switch detected by means of a measuring resistor and the switch is turned off when the detected current is a predetermined threshold for reached the maximum switch current (peak current value).
  • LEDs light emitting diodes
  • the threshold value is adapted to the determined deviation between the current delivered to the light-emitting diodes and a predetermined nominal output current for regulating the output power.
  • the current delivered to the light-emitting diodes is determined by means of the voltage delivered by a primary-side auxiliary winding of the transformer, the time of the falling edge being determined in the course of the voltage in order to determine the duration of the current flow through the secondary winding in the blocking phase.
  • Another disadvantage is that current peaks occurring at low thresholds for switching off the switch (small dimming levels) when switching on the switch can trigger an unwanted switch-off of the switch.
  • a minimum threshold may be set above expected current spikes, but this limits the control of the dimming level by varying the threshold in the lower dimming range.
  • the invention has for its object to provide devices and methods that reduce the problems described. It is in particular an object to provide a flyback converter circuit, in particular for the direct operation of one or more light sources, in particular LEDs, an operating device and a method for controlling a flyback converter circuit, which permit precise control over a large load range with a simple and inexpensive construction.
  • a flyback converter circuit comprises a controllable switch, a first transformer having a primary winding connected to the controllable switch, and a secondary winding to which the lighting means is connectable, a second transformer having a first primary winding for detecting the current through the switch flowing current, a second primary winding for detecting the current flowing through the lighting means and a secondary winding for generating a signal representing the switch current and the luminous flux, and a control device for driving the switch on the basis of this signal.
  • the second transformer allows an isolated / isolated current detection of both the switch current on the primary side of the flyback converter circuit and the LED current on the secondary side, wherein the first primary winding is flowed through by the current flowing through the primary winding of the first transformer and the switch current and the second Primary winding of the flowing through the secondary winding of the first transformer Current is flowed through.
  • the secondary winding of the second transformer is coupled to the control device and outputs a signal from which the switch current and the secondary side, the lighting means and possibly the charging capacitor feeding current can be determined.
  • the control of the switch on the basis of the signal can be permanent or only in certain operating conditions.
  • the triggering of the switch can be based exclusively on the basis of the signal and a specification of the output power or on the basis of further acquired measured variables.
  • the controller may be configured to determine the time average of the lamp current based on the signal and to determine the off and / or reconnection of the switch based on a determined deviation of the time average from a predetermined value.
  • the control device can be supplied with a dimming signal, wherein the control device is designed to set the predetermined value on the basis of the dimming signal.
  • the controller may be configured to turn off the switch when the switch current detected by the signal reaches a threshold.
  • control device can be designed to change the threshold value in order to counteract the determined deviation.
  • the flyback converter circuit can, depending on the application in the limit mode, in which the switch is switched back on when the current of the secondary coil of the first transformer has dropped to zero or the zero line then reached for the first time with a positive edge, or be operated in the discontinuous operating mode, in which the switch is not immediately switched back on when the secondary-side current has dropped to zero or reaches the zero line with a positive edge.
  • the operating modes can also be changed depending on the connected bulbs or the power output of the flyback converter circuit.
  • control device can be designed to change the operating mode of the flyback converter circuit from the limit mode to the discontinuous mode when the threshold value drops to a minimum value.
  • the minimum value may be predetermined by the manufacturer or user or determined or changed based on operating parameters determined by the controller.
  • the control device can be designed to determine the time at which the current flow through the secondary winding of the first transformer has dropped to zero during the switch-off phase by means of the signal.
  • the control device may be designed to determine the voltage profile across the switch in the discontinuous operating mode of the flyback converter circuit on the basis of the signal and to turn on the switch at a time at which the voltage profile has a voltage minimum.
  • a control device for light emitting diodes comprises at least one of the flyback converter circuits described.
  • a method of controlling the flyback converter circuit comprising the first transformer and the second transformer comprises the steps of: - driving the switch,
  • the time mean value of the luminous flux can be determined on the basis of the signal and the switching off and / or on again of the switch can be determined on the basis of a determined deviation of the time average from a predetermined value.
  • the procedure may include the steps:
  • the switch may be turned off when the switch current detected by the signal reaches a threshold.
  • the method may include the step of changing the threshold to counteract the determined deviation.
  • FIG. 1 shows a clocked flyback converter circuit according to a first embodiment according to the present invention
  • Fig. 2 is a clocked flyback converter circuit according to a second embodiment of the present invention
  • Fig. 3 is a simplified flow diagram for illustrating the method according to the present invention.
  • Fig. 1 shows a simplified circuit of a flyback converter 1 for direct operation of one or more light sources 2 according to a first embodiment of the present invention.
  • the light-emitting means 2 may comprise a light-emitting diode (LED) or a plurality of LEDs.
  • the LEDs may be inorganic or organic LEDs.
  • the multiple LEDs can be connected in series or in parallel.
  • the plurality of LEDs can also be interconnected in more complex arrangements, for example in a plurality of series circuits connected in parallel with one another. While two LEDs are shown by way of example, the light source may also have only one LED or more than two LEDs.
  • a supply voltage is supplied, which may be a DC voltage or a rectified AC voltage and is galvanically decoupled by means of the first transformer Tl converted into a DC voltage with a light source 2 corresponding voltage level.
  • the second transformer T2 serves to detect the primary-side current Ip and the secondary-side current I s for the control circuit 5 while maintaining the galvanic decoupling.
  • the switch S controllable by the control circuit 5 the primary winding LI of the transformer Tl and the first primary winding L3 of the transformer T2 are connected in series between the first input terminal 1 and the second input terminal 2.
  • the second input terminal 2 can be connected to ground and be the reference potential of all primary signal and operating voltages.
  • the flyback converter circuit 1 shown in Fig. 1 which is formed from a series connection of two LEDs formed in the example of light source 2 is connected.
  • the secondary winding L2 of the transformer Tl, the second primary winding L4 of the transformer T2, and a diode D are connected in series between the first output terminal 6 and the second output terminal 7.
  • a capacitor C (charging capacitor) is on the output terminals 6, 7 coupled in parallel.
  • Primary and secondary winding LI, L2 of the transformer Tl have a different polarity / winding direction.
  • the controllable switch S may be a power switch, a field effect transistor or a bipolar transistor.
  • the controllable switch S may be an insulated gate transistor.
  • the control circuit 5 may be a semiconductor integrated circuit or comprise a semiconductor integrated circuit.
  • the control unit 14 may be configured as a processor, a microprocessor, a controller, a microcontroller or an application specific integrated circuit (ASIC) or a combination of said units.
  • ASIC application specific integrated circuit
  • the control circuit 5 is supplied with a dimming signal received via the input terminal 8 for controlling the brightness of the luminous means 2 (varying the output power) and the signal generated by the secondary winding L5 of the second transformer T2, indicating the primary and secondary current I p , I s .
  • the control circuit 5 switches the switch S repeatedly on and off again, wherein after switching on, the primary winding LI of the transformer Tl and the primary winding L3 of the transformer T2 are traversed by current.
  • the diode D suppresses a current flow on the secondary side of the transformer Tl, whereas the secondary winding L5 of the second transformer T2 emits a the rising primary current I p corresponding current and a proportional voltage value to the control circuit. 5
  • the energy stored in the primary winding LI of the transformer T1 is output via the secondary winding L2 of the transformer T1 or forces a current flow on the secondary side through the diode D.
  • the capacitor C is charged at the output terminals 6, 7 of the flyback converter circuit 1 connected light source 2 lights.
  • the current flow on the secondary side decreases linearly and finally becomes zero in discontinuous operation and in limit operation before the control circuit 5 switches the switch S on again.
  • the output current determining secondary side current I s is detected by means of the transformer T2, wherein the secondary winding L5 of the second transformer T2 outputs a current corresponding to the falling secondary side current I s or a proportional voltage value to the control circuit 5, which is a deviation of the time average of the secondary-side current I s from a value predetermined by the dimming signal is determined by the flyback converter circuit 1.
  • Varying the output power occurs at least in a first range of the power output, in which the flyback converter circuit 1 is operated in the limit mode / mode, by varying a predetermined threshold to which after switching on the switch S, the current Ip by the switch 7 increases linearly , When the threshold value is reached, the switch S is switched off.
  • the height of the threshold value determines the output power or the brightness of the light emitted by the luminous means 2 in this mode.
  • the rise of the primary-side current I p is also detected with the transformer T2, and when the threshold value is reached, the switches are turned off.
  • the switch-off threshold decreases. However, it is often not possible to lower the switch-off threshold, since small threshold values can lead to problems in detecting and processing the low current value.
  • a limit operation of the flyback converter circuit 1 occurs at a threshold value above the minimum value and a discontinuous operation when the threshold value is smaller than or equal to the minimum value.
  • the threshold value is varied according to the power to be output or the deviation determined, the primary-side current I p detected by the output from the transformer T2 signal and the switch off when the primary-side current I p reaches the threshold.
  • the flyback converter circuit 1 changes from the limit mode to the discontinuous mode in which the switch S is not immediately switched on again after the detected secondary side current I s has dropped to zero at a time t nu ii or zero reaches a positive edge, and in which the time period from the time t nu ii to the restart of the switch S is varied according to the output power or the determined deviation at a constant threshold.
  • both the voltage edges and the current profile in the signal generated by the secondary winding L5 of the second transformer T2 can be determined and evaluated, wherein the winding ratio of the primary windings L3 and L4 to each other respective proportion of the primary and secondary side currents I p , I s in the signal is scalable and with the choice of the number of windings of the secondary winding L5, the signal is a total of scalable.
  • the winding ratio of the primary windings L3 and L4 corresponds to the winding ratio of the windings LI and L2 to each other.
  • the reclosing time is chosen so that at the reconnection time, the voltage swing across the switch S shows a minimum voltage, the control circuit detects or predicts 5 voltage minima across the switch S on the basis of the output from the secondary winding L5 signal of the transformer Tl.
  • the detection of the voltage waveform across the switch S by means of an auxiliary winding L6 of the first transformer Tl take place, wherein the control circuit 5 receives the output from the auxiliary winding L6 signal at its input terminal 9, which controls the switch S.
  • the flyback converter circuit 1 shown in FIG. 2 instead of the second transformer T2, only its primary windings L3, L4 and the secondary winding L5 are shown, which are magnetically coupled to one another.
  • An operating device may comprise one of the flyback converter circuits 1 shown in FIGS. 1 and 2 and a power factor correction rectifier which generates from a grid alternating voltage the DC voltage applied to the input terminals 3, 4, the control of the rectifier can also be done by the control circuit 5.
  • Fig. 3 is a highly simplified flow chart showing the individual steps in carrying out the method described in detail above.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

La présente invention concerne un circuit de convertisseur à récupération cadencé conçu pour faire fonctionner directement des sources lumineuses (11), comprenant un commutateur contrôlable (S), un premier transformateur (T1) avec un enroulement primaire (L1) qui est relié au commutateur contrôlable (S), et un enroulement secondaire (L2) auquel la source lumineuse (2) peut être reliée, un deuxième transformateur (T2) doté d'un premier enroulement primaire (L3) prévu pour détecter le courant circulant à travers le commutateur (S), un deuxième enroulement primaire (L4) prévu pour détecter le courant circulant à travers la source lumineuse (2) et un enroulement secondaire (L5) prévu pour générer un signal reproduisant le courant du commutateur (Ip) et le courant des sources lumineuses (Is), et un dispositif de commande (5) prévu pour contrôler le commutateur (S) à partir de ce signal.
PCT/EP2018/060638 2017-05-10 2018-04-25 Circuit de convertisseur á récuperation conçu pour faire fonctionner des sources lumineuses avec contrôle de la valeur de courant de crête et détection de la valeur moyenne de courant WO2018206294A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112018002417.2T DE112018002417A5 (de) 2017-05-10 2018-04-25 Sperrwandlerschaltung zum betreiben von leuchtmitteln mit spitzenstromwertsteuerung und mittelstromwerterfassung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017207879.0 2017-05-10
DE102017207879.0A DE102017207879A1 (de) 2017-05-10 2017-05-10 Sperrwandlerschaltung zum Betreiben von Leuchtmitteln mit Spitzenstromwertsteuerung und Mittelstromwerterfassung

Publications (1)

Publication Number Publication Date
WO2018206294A1 true WO2018206294A1 (fr) 2018-11-15

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PCT/EP2018/060638 WO2018206294A1 (fr) 2017-05-10 2018-04-25 Circuit de convertisseur á récuperation conçu pour faire fonctionner des sources lumineuses avec contrôle de la valeur de courant de crête et détection de la valeur moyenne de courant

Country Status (3)

Country Link
AT (1) AT18055U1 (fr)
DE (2) DE102017207879A1 (fr)
WO (1) WO2018206294A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6297621B1 (en) * 2000-03-13 2001-10-02 City University Of Hong Kong Voltage sensorless control of power converters
US20110037414A1 (en) * 2009-08-14 2011-02-17 Nanjing University Of Aeronautics And Astronautics Driving apparatus for light emitting diodes
US20110175543A1 (en) * 2008-09-25 2011-07-21 Koninklijke Philips Electronics N.V. Driver for providing variable power to a led array
US20130051090A1 (en) * 2011-03-10 2013-02-28 Hangzhou Silan Microelectronics Co., Ltd. Current reference generating circuit and a constant current switch mode power supply control circuit and method thereof
US20140029316A1 (en) * 2012-07-27 2014-01-30 Stmicroelectronics S.R.L. Method and circuit for controlling a switching regulator
US20140153292A1 (en) 2012-12-05 2014-06-05 Iwatt Inc. Primary side sense output current regulation
EP2770623A1 (fr) * 2013-02-20 2014-08-27 Nxp B.V. Convertisseur résonant
DE102015210710A1 (de) * 2015-06-11 2016-12-15 Tridonic Gmbh & Co Kg Getaktete Sperrwandlerschaltung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6297621B1 (en) * 2000-03-13 2001-10-02 City University Of Hong Kong Voltage sensorless control of power converters
US20110175543A1 (en) * 2008-09-25 2011-07-21 Koninklijke Philips Electronics N.V. Driver for providing variable power to a led array
US20110037414A1 (en) * 2009-08-14 2011-02-17 Nanjing University Of Aeronautics And Astronautics Driving apparatus for light emitting diodes
US20130051090A1 (en) * 2011-03-10 2013-02-28 Hangzhou Silan Microelectronics Co., Ltd. Current reference generating circuit and a constant current switch mode power supply control circuit and method thereof
US20140029316A1 (en) * 2012-07-27 2014-01-30 Stmicroelectronics S.R.L. Method and circuit for controlling a switching regulator
US20140153292A1 (en) 2012-12-05 2014-06-05 Iwatt Inc. Primary side sense output current regulation
EP2770623A1 (fr) * 2013-02-20 2014-08-27 Nxp B.V. Convertisseur résonant
DE102015210710A1 (de) * 2015-06-11 2016-12-15 Tridonic Gmbh & Co Kg Getaktete Sperrwandlerschaltung

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Publication number Publication date
DE102017207879A1 (de) 2018-11-15
AT18055U1 (de) 2023-12-15
DE112018002417A5 (de) 2020-01-30

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