WO2014172733A1 - Circuit et procédé permettant de faire fonctionner un moyen d'éclairage - Google Patents

Circuit et procédé permettant de faire fonctionner un moyen d'éclairage Download PDF

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Publication number
WO2014172733A1
WO2014172733A1 PCT/AT2014/000091 AT2014000091W WO2014172733A1 WO 2014172733 A1 WO2014172733 A1 WO 2014172733A1 AT 2014000091 W AT2014000091 W AT 2014000091W WO 2014172733 A1 WO2014172733 A1 WO 2014172733A1
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WO
WIPO (PCT)
Prior art keywords
circuit arrangement
frequency
converter
voltage
regulator
Prior art date
Application number
PCT/AT2014/000091
Other languages
German (de)
English (en)
Inventor
John SCHÖNBERGER
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 ATGM9017/2014U priority Critical patent/AT15822U1/de
Publication of WO2014172733A1 publication Critical patent/WO2014172733A1/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]
    • H05B45/30—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
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
    • 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]
    • 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
    • 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
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the invention relates to a circuit arrangement and a method for operating a luminous means.
  • the invention relates to circuit arrangements including a converter operated to provide power factor correction.
  • a power factor correction is used in control gear for such bulbs to reduce the unwanted generation of harmonic currents in the supply network.
  • the power factor is a measure of harmonic currents generated by the operating circuit.
  • a power factor correction circuit may be provided as an input stage between a rectifier and a transformer Booster converter work.
  • output side voltage ripples that oscillate at twice the line frequency can adversely affect PFC correction.
  • the attempt to correct voltage ripples on the output side in conventional lead to the fact that harmonic currents are not reduced to the desired extent.
  • One approach to solving these problems may be to suppress the voltage ripples on the output side.
  • an output capacitor with a large capacity can be provided on the output side.
  • a controller with a small bandwidth can be used.
  • such approaches can bring various disadvantages.
  • the use of a large capacity capacitor as the output capacitor may be undesirable because of the size of the device and / or potential cost penalties.
  • the invention has for its object to provide devices and methods in which a good power factor correction can be achieved without voltage ripple must be suppressed at the output side of a converter by a high-capacity output capacitor.
  • the invention has for its object to provide such devices and methods that can be used in PFC converters with voltage regulation.
  • a circuit arrangement for operating a luminous means and a method having the features specified in the independent claims are provided.
  • the dependent claims define embodiments of the invention.
  • a circuit arrangement for operating a luminous means uses a regulator which comprises a PI (proportional-integral) element and which is set up to a signal component of an input signal of the regulator which is twice the supply voltage frequency. It has been found that by the phase shift of the signal component which oscillates at twice the supply voltage frequency, good power factor correction can be achieved even if these voltage ripples are not strongly suppressed on the output side. A particularly good power correction can be achieved if the phase shift at the frequency which is equal to twice the supply voltage frequency is within an interval of -90 ° and / or approximately -90 °. This allows the use of a smaller output capacitor and / or a larger bandwidth regulator than conventional control strategies that do not intentionally introduce an additional phase shift.
  • PI proportional-integral
  • the controller may be configured such that a transfer function of the regulator has two poles at frequencies that are in an environment of frequency equal to twice the supply voltage frequency.
  • a circuit arrangement for operating a luminous means comprises an input for receiving an AC voltage having a first frequency.
  • the circuit arrangement comprises a power factor correction converter having an inductance, a controllable switching means connected in series with the inductor, and a regulator.
  • the regulator has a P-element and is arranged to produce a phase shift for a signal component having a second frequency twice the first frequency.
  • the PI element exhibits the behavior of a conventional PI controller, but the controller is supplemented by components for introducing an additional phase shift.
  • the regulator may include the PI member, a first pole, and a second pole.
  • the first pole and the second pole may be at a frequency or at frequencies in an environment of the second frequency, ie, near twice the supply voltage frequency.
  • the first pole and the second pole may be double poles or a second-order pole.
  • the frequencies at which the poles are located may be smaller than a frequency with which the controllable switching means is switched clocked.
  • the controller may include a galvanic isolation.
  • the converter may have an input side with the inductor and one of them galvanically isolated output side.
  • the PI member may be provided on the output side of the converter.
  • a filter whose transfer function has the first pole and / or the second pole can be provided on the input side of the converter.
  • the controller can be set up so that the phase shift for the signal component, which oscillates at twice the frequency of the supply voltage, lies within an interval by a phase shift of -90 °.
  • the controller may be arranged so that the phase shift for the signal component which oscillates at twice the frequency of the supply voltage deviates by less than a predetermined threshold value of -90 °.
  • the controller can be set up so that the phase shift for the signal component is -90 °.
  • the circuit arrangement may comprise an integrated circuit for driving the controllable switching means.
  • the integrated circuit may have an input to receive a signal containing the signal component phase shifted by the controller.
  • the integrated circuit may be configured to control the controllable switching means such that an on-time and / or an off-time of the controllable switching means depends on the respective phase of the phase-shifted signal component.
  • the integrated circuit may be configured to control the controllable switching means to provide a voltage at an output of the circuit board. Order is regulated to a desired value.
  • the controlled variable may be a variable detected on the output side of the regulator, for example the output voltage itself.
  • the controlled variable may also be an auxiliary variable detected on the input side, ie a primary side of the converter.
  • the auxiliary size can be regulated to set the output voltage to a desired value.
  • the auxiliary size can be detected, for example, with a Hilfswindung on the input side.
  • the converter may be a flyback converter connected to the input via a rectifier.
  • the converters may be a PFC flyback converter.
  • the circuit arrangement may be an operating circuit for at least one light-emitting diode.
  • the circuit arrangement may form an LED converter or be comprised by an LED converter.
  • a system which comprises the circuit arrangement according to an embodiment and at least one light-emitting diode which is connected to an output of the converter.
  • the at least one light-emitting diode may comprise at least one inorganic light-emitting diode and / or at least one organic light-emitting diode.
  • the at least one light-emitting diode can be connected to the output of the converter via a converter circuit, which is connected between the output of the converter and the at least one light-emitting diode.
  • a method for operating a luminous means with a circuit arrangement is specified, to which an alternating voltage with a first frequency is supplied and which comprises a converter.
  • a controllable switching means which is connected in series with an inductance of the converter, switched clocked.
  • the method includes voltage regulation with a regulator having a PIL member. In voltage regulation, the controller generates a phase shift for a signal component which is a second fre- quency signal. frequency that is twice as large as the first frequency.
  • the method can be carried out with the circuit arrangement according to an embodiment.
  • the circuit arrangement and the method according to embodiments use a control strategy in which the controller selectively causes a certain phase shift at least for those signals and signal components whose frequency is twice the supply voltage frequency.
  • the regulator may include, in addition to the PI, at least one filter which causes the corresponding phase shift for those signals and signal components which oscillate at twice the supply voltage frequency.
  • the at least one filter may have two poles. The poles may be approximately twice the supply voltage frequency.
  • Such a controller may also be referred to as a "PI + PP” or “ ⁇ ” controller since it has two poles in addition to the PI.
  • This control strategy allows for a good performance without sacrificing the voltage ripples, which oscillate at twice the supply voltage frequency, on the output side by a high capacity output capacitor and / or in voltage regulation by a regulator must be removed with a small bandwidth.
  • the control strategy can be used in particular for PFC flyback converter.
  • FIG. 1 shows a system according to an exemplary embodiment.
  • Figure 2 shows a circuit diagram of a circuit arrangement according to an embodiment.
  • FIG. 3 is a block diagram representation of a regulator according to an embodiment.
  • FIG. 4 is a block diagram representation of a regulator according to an embodiment.
  • Figure 5 shows voltage ripples of a signal generated by the controller according to an embodiment.
  • Figure 6 shows a signal generated by the controller according to an embodiment together with an input signal of the controller.
  • FIG. 7 shows a Bode diagram for a regulator of a circuit arrangement according to an exemplary embodiment and for a conventional regulator.
  • FIG. 8 shows an input current of a circuit arrangement according to an exemplary embodiment.
  • FIG. 9 shows an input current of a conventional circuit arrangement in which an output capacitor with a larger capacity than in FIG. 8 is used.
  • FIG. 10 shows a circuit diagram of an implementation of a regulator according to an exemplary embodiment.
  • FIG. 1 shows a circuit diagram of a circuit arrangement according to a further exemplary embodiment.
  • FIG. 1 shows an illustration of a system 1 which has an operating device with a Circuit arrangement 2 for operating a luminous means 3 comprises.
  • the luminous means 3 may comprise at least one light-emitting diode (LED).
  • the luminous means 3 can comprise a plurality of LEDs.
  • the LEDs may be inorganic or organic LEDs.
  • the circuit arrangement 2 has an input 10 to which a supply voltage is supplied.
  • the supply voltage is an AC voltage, for example a mains voltage.
  • a frequency of the supply voltage at the input 10 is also referred to here asnningstapsfre- frequency or as the first frequency. Double the supply voltage frequency is called the second frequency. This second frequency plays a role in the control strategy of the circuit arrangement 2.
  • the circuit arrangement 2 comprises a rectifier 1 1, which provides a rectified AC voltage to a transducer 12.
  • the converter 12 may be configured as a power factor correction (PFC) converter, which is operated to reduce the return of harmonic currents into the network.
  • the converter 12 may be, for example, a flyback converter. Other converter types can be used.
  • An output of the converter may be connected to the lighting means 3.
  • the luminous means 3 can be connected to an output terminal 14 of the circuit arrangement 2.
  • the luminous means 3 can be connected directly to an output terminal 14 of the circuit arrangement 2.
  • a converter circuit can be connected between the output terminal 14 and the luminous means 3, which preferably regulates the current or the power of the luminous means 3.
  • This converter circuit can be formed, for example, by a buck converter (buck converter), boost converter (boost converter) or an inverter circuit (buck-boost converter).
  • the converter 12 has a regulator 13.
  • the regulator 13 may be a voltage regulator.
  • the controlled variable of the regulator 13 can be, for example, the output voltage of the converter 12 or an auxiliary variable, which is related to the output voltage of the converter 12.
  • the controller 13 includes a PI (proportional-integral) member. The controller is designed to cause a certain phase shift for an input signal whose frequency is twice the supply voltage frequency.
  • the output signal generated by the input signal from the controller may, for example, have a phase shift of -90 ° with respect to the input signal, which oscillates at the second frequency, ie twice the supply voltage frequency.
  • the phase shift caused by the sinusoidal signal controller 13 in response to the frequency of the signal may be defined by the phase response of a transfer function of the regulator 13.
  • the transfer function can be defined as a quotient of the output variable of the controller 13 transformed into the frequency range to the input variable of the controller 13 transformed into the frequency range.
  • the complex argument of the transfer function, ie the phase shift, as a function of the frequency defines the phase response.
  • the controller 13 may be designed such that the phase response of the regulator 13 at the second frequency, which is twice the supply voltage frequency, has a value of -90 ° or is approximately equal to -90 °.
  • FIG. 2 shows a circuit diagram of a circuit arrangement 2 according to an embodiment in which the converter is designed as a flyback converter.
  • Such converters are also referred to as flyback converters or boost / buck converters.
  • the converter has a transformer, which may comprise a primary-side inductance 22 and a secondary-side inductance 25.
  • a primary side of the converter has a main inductance 21 in which energy can be stored.
  • the primary-side inductance 22 and the main inductance 21 are shown schematically separately in FIG. 2, but need not be separate components. For example, only a single coil can be provided, which performs the function of the main inductance 21 and the primary-side inductance 22 of the transformer.
  • the primary-side inductance 22 of the transformer can be a leakage inductance.
  • the converter has a controllable switching means 23, which is connected in series with the main inductor 21.
  • the controllable switching means 23 is switched in operation of the converter to transfer energy from the primary side of the transformer, which is the input side of the converter, to the secondary side, which is the output side.
  • energy is stored in the main inductance 21.
  • This state is also referred to as a conduction phase or charge phase in which the main inductance 21 is charged with energy.
  • the cached energy is transmitted to the secondary side. This phase is also referred to as a blocking phase.
  • the secondary side has a rectifier, which may comprise a diode 26 or several diodes.
  • An output capacitor 27 on the secondary side can be charged when energy is transferred from the primary side to the secondary side.
  • the capacitor 27 is also referred to as a charging capacitor.
  • the controllable switching means 23 may be a transistor.
  • the controllable switching means 23 may be a power transistor.
  • the controllable switching means 23 may be, for example, a bipolar transistor, an insulated gate transistor, a field effect transistor or another controllable switch.
  • the circuit arrangement 2 has a voltage regulation loop 30.
  • the voltage regulation loop 30 may use a voltage Vo of the output side as a controlled variable.
  • the voltage Vo of the output side can be tapped at a point 28, for example via an ohmic voltage divider.
  • a reference source 31 may specify a desired value Vo ref.
  • a difference amplifier 32 or subtractor can determine the deviation between the voltage Vo of the output side and the desired value.
  • the controller 13 may switch the controllable switching means 23. Depending on the deviation, which is supplied to the controller 13, for example, an on-time of the controllable switching means and / or an off-time of the controllable switching means be changed to regulate the voltage Vo of the output side in the direction of the setpoint. For example, the ratio of on-time (t on ) to off-time (t 0 ff) can be set depending on which control signal the controller 13 generates from the input signal supplied to it.
  • the output side voltage Vo may include voltage ripple at the second frequency which is twice the supply voltage frequency. Such voltage ripples are caused by the rectification, which provides a rectified AC voltage to the transducer 12.
  • FIG. 3 is a block diagram of components of a regulator according to an embodiment.
  • the controller has a P-member 41.
  • the controller has at least one component 42 for inducing an additional phase shift.
  • the at least one component 42 may comprise one or more filters.
  • the at least one component 42 causes a signal which oscillates at twice the supply voltage frequency to be provided with an additional phase shift.
  • An output signal Vc of the combination of the PI element 41 and the at least one component 42 for causing the additional phase shift has a certain phase shift relative to the corresponding input signal. This phase shift is chosen for the second frequency, ie the frequency of the voltage ripple, so that the phase-shifted voltage ripple in the output signal Vc reduces the total harmonic distortion (THD) of the input current and / or the input voltage becomes.
  • TDD total harmonic distortion
  • the at least one component 42 for causing the additional phase shift may have a transfer function having two poles.
  • the two poles may be in a second frequency environment that is twice the supply voltage frequency.
  • the output signal Vc of the combination of the PI member 41 and the at least one component 42 for causing the phase shift may influence a switch controller 43.
  • the switch controller 43 may switch the controllable switching means 13 clocked.
  • the switching on and off of the controllable switching means can vary with the phase-shifted voltage ripples of the output side time-dependent. These out-of-phase spanning nipples are included in the output signal Vc, which provides the combination of the PI member 41 and the at least one additional phase shifting component 42.
  • the switch controller 43 may be an integrated circuit.
  • the switch controller 43 may be configured as a processor, a microprocessor, a controller, a microcontroller, or an application specific integrated circuit (ASIC).
  • ASIC application specific integrated circuit
  • FIG. 4 shows an implementation of the controller for a control device according to an exemplary embodiment.
  • the regulator has the Pl member and components 45, 46.
  • the components 45, 46 may each be an analog filter or a digital filter.
  • the components 45, 46 each define one pole of the transfer function.
  • the filter 45 may have a transfer function having a first pole.
  • the filter 46 may have a transfer function having a second pole.
  • the first pole and the second pole may be in an environment of the second frequency equal to twice the supply voltage frequency.
  • the first pole and the second pole may be at twice the supply voltage frequency.
  • a variety of other embodiments of the controller may be used in embodiments.
  • two poles of the transfer function can also be provided by only one filter having double poles. While functional blocks are shown in FIG. 3 and FIG. 4, the different components need not be separate elements.
  • a digital processor can take over both the function of the PI controller and the generation of the additional phase shift.
  • the use of the filters or other components providing the first pole and the second pole causes a phase shift of approximately -90 ° for signals whose frequency is equal to twice the supply voltage frequency. For the closed control loop results in a total shift of -180 °.
  • the PI element and the additional phase-shifting component of the regulator may be implemented by analog circuit elements or in digital technology. The order of the various components can be reversed. For example, the additional phase shift may be introduced before a signal is applied to the PI.
  • One or both of the filters that provide the two poles of the transfer function may be located in front of the PI.
  • the controller may also include a galvanic isolation. This allows some of the components of the regulator to be located on the secondary side and others of the regulator components on the primary side.
  • FIG. 5 shows a signal 51 at the output of the components 41, 42 of FIG. 3 or at the output of the components 41, 45, 46 in FIG. 4, when an input signal of the regulator has voltage ripples which oscillate at twice the supply voltage frequency.
  • This signal 51 can be used as a control signal, on which the switching of the controllable switching means 23 depends.
  • a dashed line Shown by a dashed line is a signal 52 at the output of a PI element in a conventional controller, if no additional phase shift is introduced.
  • the signal 51 has a phase shift 53 caused by the two poles in the transfer function of the regulator at twice the supply voltage frequency.
  • the phase shift 53 shows the change in the phase angle of a controller used in embodiments compared to a conventional PI controller without additional phase shift.
  • FIG. 6 shows the signal 51 at the output of the components 41, 42 of FIG. 3 or at the output of the components 41, 45, 46 in FIG. 4 together with the corresponding input signal 55 of the regulator.
  • the input signal 55 has voltage ripples corresponding to the voltage ripple on the output side of the converter.
  • the signal 51 has a phase shift 59 of approximately -90 ° with respect to the input signal 55.
  • the phase shift 59 is caused by the two poles in the transfer function of the regulator at twice the supply voltage frequency.
  • FIG. 7 shows a Bode diagram for the regulator according to an embodiment in which an additional phase shift is introduced.
  • the Bode diagram for the controller according to an embodiment is shown in solid lines.
  • the Bode diagram for a conventional PI controller is shown by dashed lines for comparison.
  • a phase path 61 of a regulator according to an embodiment is shown in the lower part of the Bode diagram.
  • the second frequency 60 is twice the supply voltage frequency.
  • the absolute value of this second frequency depends on the supply voltage frequency, may be different for different supply sources and is not important for the following explanations.
  • the phase response 61 corresponds to the complex argument of the transfer function of the regulator according to an embodiment in which an additional phase shift is generated.
  • the phase path 61 has a function value which lies in an interval 63.
  • the interval 63 defines an environment of a phase shift of -90 °.
  • An absolute value of the difference between the interval limits of the interval 63 may be less than 90 °.
  • the interval 63 can extend symmetrically by the value of -90 °.
  • the function value of the phase response 61 at the second frequency 60 indicates the phase shift that undergoes a sinusoidal signal through the combination of the PI with the additional phase shift.
  • phase response 61 of the regulator used in embodiments may be strictly monotonic decreasing at the second frequency 60. This can be achieved by an appropriate choice of the additional poles of the transfer function, which lead to the phase shift.
  • the phase response 61 of the regulator used in embodiments may have a local maximum at a frequency less than the second frequency 60. It can thereby be achieved that the phase shift at the second frequency 60 in the interval 63 is around the value -90 °.
  • phase response 62 of a conventional PI controller without additional phase shift is also shown in the lower part of the Bode diagram for comparison.
  • the phase response 62 differs significantly from the phase path 61.
  • the phase signal 62 has a larger (and smaller magnitude) value than the phase path 61.
  • the upper part of the Bode diagram shows the gain 64 of the regulator used in embodiments and the gain 65 of a conventional PI controller without additional phase shift.
  • FIG. 8 shows an exemplary time characteristic of an input current 71 for a switching arrangement according to an exemplary embodiment.
  • FIG. 9 shows an exemplary time characteristic of an input current 72 for a switching arrangement with a conventional PI controller, in which no additional phase shift is generated.
  • the input current 72 of FIG. 8 shows an exemplary time characteristic of an input current 71 for a switching arrangement according to an exemplary embodiment.
  • FIG. 9 shows an exemplary time characteristic of an input current 72 for a switching arrangement with a conventional PI controller, in which no additional phase shift is generated.
  • FIG. 10 is a circuit diagram illustrating an implementation of a regulator in embodiments.
  • the regulator comprises a PI member 80, a filter 81 for defining a first pole of the transfer function, and another filter 82 for defining a second one. pole of the transfer function.
  • the poles in the transfer function introduced by the filters 81, 82 are in an environment of twice the supply voltage frequency.
  • the P-element may have a capacitance 83 in series with a resistor 84.
  • the filter 81 may have a capacity 85.
  • the further filter 82 may have a further capacitance 86 and a further resistor 87.
  • the governor has a galvanic isolation.
  • an opto-coupler 90 may be provided between the primary side and the secondary side of the converter.
  • Other elements for galvanic isolation can be used.
  • the PI member 80 and the filter 81 are on the secondary side.
  • the further filter 82 is arranged on the primary side.
  • the optocoupler 90 may be connected via a resistor 92 to a voltage source 91.
  • An output of the combination of the PI element 80 and the filter 81 is connected to an input side of the optocoupler 90.
  • An operational amplifier 93 may define a voltage reference. The operational amplifier 93 can keep a current at the output of the optocoupler 90 constant.
  • a voltage applied to a photodiode of the optocoupler 90 is provided by a voltage source 94 via a voltage divider comprising resistors 95, 96.
  • a current flowing through the photodiode is supplied via a resistor 97 to an input of an operational amplifier 99.
  • a voltage source 98 may provide a reference voltage to another input.
  • the further filter 82 may be connected to the input and the output of the operational amplifier 99.
  • the signal Vc provided at the output of the operational amplifier can be used to control switching operations of the controllable switching means of a converter. For example, the ratio between on-time and off-time may be changed depending on the signal Vc. voltage ripple in the signal Vo representing the voltage on the output side are present with a corresponding phase shift in the signal Vo and affect the switching of the controllable switching means. Numerous other implementations of the various components of the controller may be used in other embodiments. Other configurations of the PI member and the filters 81, 82 may be used. The Pl member 80 and the filter 81 may be disposed on the primary side. The voltage Vo on the output side can be transmitted to the primary side via an optocoupler or other galvanic isolation.
  • another controlled variable can be used to perform a voltage regulation.
  • a voltage which depends on the voltage of the output side can be detected on the primary side.
  • the voltage on the output side can be regulated indirectly.
  • Figure 1 1 is a circuit diagram of a circuit arrangement according to an embodiment.
  • An auxiliary inductor 101 may be inductively coupled to the secondary inductance 25.
  • a voltage at the auxiliary inductance 101 can be detected.
  • the corresponding voltage can be supplied as an auxiliary signal Vaux to the voltage regulation loop 30 via an ohmic voltage divider 102.
  • a reference voltage source 31 provides a signal Vaux_ref representing the target value.
  • the controller 13 may have further inputs in addition to an input 105 at which the auxiliary signal Vaux or the deviation of the auxiliary signal from the desired value is received.
  • the controller 13 may have an input 107 to detect when the main inductance 21 is de-magnetized. Switching operations can be triggered depending on when the main inductance 21 is demagnetized.
  • the controller 13 controls at an output 106, a control signal with which the controllable switching means 23 is controlled. While embodiments have been described with reference to the figures, modifications may be made in other embodiments.
  • the controller in which an additional phase shift for voltage ripple is deliberately introduced, can also be implemented in digital technology. A corresponding regulation, in which an additional phase shift for voltage ripple is deliberately introduced, can be used with different converter types. Methods and devices according to embodiments can be used in operating devices for lighting, for example in an LED converter.

Abstract

L'invention concerne un circuit permettant de faire fonctionner un moyen d'éclairage (3), comprenant une entrée et un convertisseur à correction du facteur de puissance. Le convertisseur comporte une bobine d'inductance (21), un moyen de commutation (23) pouvant être commandé, lequel est monté en série avec la bobine d'inductance (21), et un régulateur (13, 30). Le régulateur (13, 30) comprend une section pi. Le régulateur (13, 30) est mis au point pour produire un déphasage pour une composante d'un signal d'entrée du régulateur (13, 30), dont la fréquence est deux fois plus importante qu'une fréquence d'une tension d'entrée.
PCT/AT2014/000091 2013-04-26 2014-04-25 Circuit et procédé permettant de faire fonctionner un moyen d'éclairage WO2014172733A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ATGM9017/2014U AT15822U1 (de) 2013-04-26 2014-04-25 Schaltungsanordnung und Verfahren zum Betreiben eines Leuchtmittels

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102013007278.6 2013-04-26
DE102013007278 2013-04-26
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