EP2225918B1 - Illumination means operating device, particularly for leds, with electrically isolated pfc - Google Patents
Illumination means operating device, particularly for leds, with electrically isolated pfc Download PDFInfo
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- EP2225918B1 EP2225918B1 EP08853422.7A EP08853422A EP2225918B1 EP 2225918 B1 EP2225918 B1 EP 2225918B1 EP 08853422 A EP08853422 A EP 08853422A EP 2225918 B1 EP2225918 B1 EP 2225918B1
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- Prior art keywords
- voltage
- inductance
- vout
- output voltage
- operating device
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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
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
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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
- 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
-
- 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
Definitions
- the present invention relates to power factor correction ("Power Factor Control” or "PFC”) lamp power supplies, and more particularly to a power factor correction circuit.
- PFC power factor correction
- the power factor reflects the current drain of an electrical appliance from the mains.
- the AC line voltage is known to have a sinusoidal time course and ideally therefore the current drawn from the mains should also have a sinusoidal time characteristic.
- this ideal case which is characterized by a power factor of 1, does not always occur, but the current can even deviate considerably from a sine wave envelope, in which case the power factor drops.
- the extracted current is not sinusoidal, so that harmonics are generated in the mains current.
- These unwanted harmonic currents in the supply network are known to be reduced by means of a power factor correction circuit.
- a smoothing capacitor C21 filters a rectified input AC voltage Vin, which is measured by means of a voltage divider R21, R22.
- the input AC voltage Vin is supplied to an inductor L21, and a secondary winding L22 detects the zero-crossings of the current through the inductor L21.
- a current measuring resistor (shunt) R23 in series with the switch, for example in the source line of a transistor T21, allows the detection of the peak inductance current in order to be able to detect a possibly overcurrent state.
- a second voltage divider R24, R25 is arranged to measure the bus DC voltage Vbus and to detect an overvoltage condition, for example, due to load jumps.
- circuit 20 can not deliver a galvanically isolated voltage.
- the US 2007040516 A1 discloses in this context a circuit with power factor correction for the conversion of alternating voltage in galvanically isolated DC voltage. After a rectifier has converted a mains voltage into a rectified input AC voltage, it is in turn converted by a converter 10 into a DC voltage suitable for operating a lamp.
- converter 10 for generating the DC output voltage Vout is a half-bridge converter, which consists of a push-pull converter 11 and an output stage 12 for energy storage and low-pass filtering.
- the converter 10 is preceded by a power factor correction circuit (not shown), which provides as an active power factor correction for a nearly sinusoidal current consumption from the network.
- This upstream power factor correction circuit provides the converter 10 with a step-up bus DC voltage Vin.
- the push-pull converter or the half bridge 11 consists of two transistors T11, T12, such as two MOSFET transistors, which are connected in parallel with two capacitors C11, C12.
- the center point of the two series-connected transistors T11, T12 is connected to the primary side n1 of a transformer such that one side of this primary transformer coil n1 is alternately connected to a positive and negative voltage.
- the other side of the primary transformer coil n2 becomes held by the capacitive voltage divider C11, C12 to a fixed voltage.
- Vout f (n2 / n1 * Vbus).
- US 6,008,589 A1 discloses an operating device for a discharge lamp, which is coupled as an AC load at the output of the operating device.
- the operating device has an active power factor correction circuit, a potential separation transformer and a buffer element.
- the basic idea of the invention is that a part of the current flow from the switch of the active power factor correction circuit is supplied directly to the transformer and is not first subjected to an intermediate storage.
- a circuit for the potential-separated generation of an output voltage from a mains voltage can thus have a power factor correction circuit with an inductance and an actively controlled switch, wherein the current flow from the inductor or through the switch (when it is closed) always to a part of an intermediate storage in a condenser is used while the other part of the current flow is fed directly to a potential separation transformer.
- the power factor correction circuit of the present invention on the one hand has the normal task of such a circuit, but on the other hand also assumes the function of the half bridge of US 2007040516 A1 ,
- the activation of the power factor correction switch is in particular at the network level. If the feedback now takes place on the secondary side, namely from the output voltage, this feedback must be electrically isolated in order to continue to have complete potential separation between the input side (mains side) and the output side.
- the invention can then be used advantageously if there is a requirement for a potential-separated output voltage.
- the energy cached by the capacitor may preferably be forwarded to the potential separation transformer in the next charge / discharge cycle.
- the power factor correction circuit may be operated in a continuous or discontinuous mode.
- the energy storage performance of the capacitor may be smaller than that of an electrolytic capacitor.
- the output voltage can be filtered by a low-pass filter.
- the cached energy from the capacitor can be forwarded to the potential separation transformer.
- an integrated circuit is proposed, which is designed for carrying out a method described above.
- FIG. 3 An embodiment of a power factor correction circuit 30 according to the present invention is shown.
- an input voltage Vin which supplies a power factor correction circuit 31, which in turn generates a DC bus voltage Vbus, is applied to the power factor correction circuit 30.
- Bus voltage is not to be understood as the voltage of an external bus line, but a DC supply voltage.
- This input AC voltage Vin is preferably rectified by a rectifier (not shown) AC line voltage.
- the input AC voltage Vin is applied to an inductor L31, i.e. a coil, fed.
- the coil L31 is connected in series with a diode D31 between a first input terminal DC_IN / MAINS supplied with the input AC voltage Vin and a second bus voltage terminal 33 at which the bus DC voltage Vbus is provided.
- An output DC capacitor C31 which is preferably designed as an electrolytic capacitor, connects the bus voltage connection 33 to ground and stabilizes the bus voltage as a buffer element. Parallel to this output DC capacitor C31 and two switches T32, T33 are connected in series. The switches or the circuit breakers T31, T32, T33 are preferably the same.
- the output DC capacitor C31 is decoupled from the rectifier (not shown), which rectifies the input AC voltage, via the switching elements diode D31 and switch T32.
- a transistor or a controllable switch T31 is connected to the connection 32 between the coil L31 and the diode D31.
- transformers N1-N2, N1'-N2 ' may be different, they are preferably the same size.
- the switch T31 When the switch T31 is turned on, the coil L31 is shorted to ground and the diode D31 is turned off. The coil L31 charges, so that actually energy can be stored in this coil L31.
- the coil L31 When the switch is open, the coil L31 is known to string a current through the diode D31. That is, the diode D31 is conductive and that the coil L31 then via the diode D31 in the output DC capacitor C31 discharges. The energy is thereby transmitted to the output DC capacitor C31.
- the secondary sides N2 and N2 'of the transformers N1-N2 and N1'-N2' are connected in series and each connected to a diode D32, D33. These two diodes D32, D33 are also connected together at a point 36.
- the voltage which results between the midpoint 35 of the transformers N1-N2, N1'-N2 'and the connection point 36 of the diodes D32, D33 is then fed to a low-pass filter and accordingly filtered or averaged.
- This low-pass filter consists for example of a choke L32 and an output capacitor C32, wherein the output voltage Vout results at the output capacitor C32.
- the two switches or MOSFET transistors T32, T33 can be controlled by the control circuit 50 synchronized with the switch T31.
- the Switch T32 is turned on synchronously to the switch T31 and possibly also switched off.
- the switch T33 can be switched on when the switch T31 and optionally also the switch T32 is opened by the control circuit 50.
- the switch-on and / or switch-off time of the switches T32, T33 can also be selected by the control loop or due to the applied load. To avoid half-bridge shorting, a dead time may be inserted before turning on the switch T32 or the switch T33. This synchronous operation can be used above all during operation with high load, for example maximum brightness of the connected lighting means.
- an operating mode deviating from operation with a high load for example maximum brightness of the connected lighting means
- Such an operating mode may be present, for example, when no load, only a small load is applied or an error such as an idle case or a load short circuit is present.
- the clock frequency of the two switches can be increased, it being possible for the control unit to switch one of the two switches T32, T33 in synchronism with the switch T31, but the two switches T32, T33 can then be clocked at a higher frequency. If necessary, there may also be periods in which either both or only one switch is not clocked. In this way, a so-called burst operation is possible.
- the diode D31 can also be replaced by a further switch T34, which is then also actively clocked and controlled by the control unit.
- the switches T31-T34 can be operated synchronously or asynchronously, in burst mode or in another operating mode
- Fig. 4 shows a further embodiment of the invention.
- the power factor correction circuit 40 shown there essentially comprises the components of the in Fig. 3 shown circuit 30th
- the power factor correction circuit has faced Fig. 3 in that the output DC capacitor C31 has been replaced by two capacitors C41, C42 connected in series. These capacitors C41, C42 are preferably electrolytic capacitors.
- the switches T32, T33 are no longer provided in this embodiment.
- a diode D41, D42 is connected in parallel with each capacitor C41, C42, the center point 34 'of the capacitors C41, C42 and thus also of the diodes D41, D42 being connected to the series arrangement of the two transformers N1-N2, N1'-N2' ,
- circuit 40 The operation of the circuit 40 is similar to that of FIG Fig. 3 shown circuit 30th
- the proportion converted directly by the transformers N1-N2, N1'-N2 ', which thus does not serve to hold the bus voltage Vbus via the electrolytic capacitors C41, C42, is converted directly and without loss.
- the capacitors C41, C42 according to FIG Fig. 4 be made simpler than in a conventional power factor correction circuit.
- the direct conversion of part of the current flow can significantly reduce the capacitance of the electrolytic capacitors C41, C42.
- the circuit embodiment 30 has Fig. 3 most control margin, since it comprises the two switches or MOSFETs transistors T32, T33.
- this control has the following disadvantage that these switches T32, T33 must also be synchronized.
- Fig. 5 shows how the inventive active power factor correction based on the in Fig. 4 shown circuit 40 can be performed.
- circuit topology of in Fig. 3 shown embodiment can be selected.
- the switch T31 is driven by a control circuit 50.
- the control circuit 50 has an output 51, via which the switch T31, a control signal is supplied.
- the frequency of the control signal typically at least 10 kHz
- the turning on and off of the switch 306 is substantially higher than the frequency of the mains voltage (typically 50 Hz) and the rectified input AC voltage (typically 100 Hz).
- the control circuit 50 In order to determine the switch-on time t on or the switch-off time toff of the switch T31, the control circuit 50 requires information about the bus voltage Vbus (or the output voltage Vout) or about the zero crossing of the current through the coil L31.
- the information about the zero crossing of the current through the coil L31 is actually only in the discontinuous Operation is required in which the coil current actually drops to zero in each period. In continuous operation, however, the coil current does not go back to zero when the switch T31 is turned off, so that this zero-crossing information is also not necessary.
- information about the input voltage Vin or the peak current through the coil L31 may be needed, in the latter case in particular to prevent overcurrent conditions.
- control circuit 50 must know the bus DC voltage Vbus or the output voltage Vout and possibly also the input voltage Vin, the zero crossing of the coil current or the coil peak current.
- the zero crossing of the coil current and the coil peak current can each be determined by means of a secondary winding L22 and a current measuring resistor R23.
- control circuit 25 monitors the bus voltage Vbus and the course of the mains input voltage Vin via two voltage dividers R21, R22 and R24, R25, the control of the switch T31, the course of the mains voltage and the output voltage to the filter Capture C32, L32.
- the intermediate bus voltage Vbus is no longer detected.
- bus voltage Vbus is "hard” coupled to the output voltage Vout via the transformers N1-N2, N1'-N2 ', so that any impermissible states at the bus voltage Vbus could be detected directly in the output voltage Vout.
- Fig. 5 also shows how a load 60, in particular a light source such as a light emitting diode, can be connected directly to the output of the power factor correction circuit 30, 40.
- a load 60 in particular a light source such as a light emitting diode
- the lighting means by means of a subsequent converter can be controlled.
- This subsequent converter can be a simple constant current source.
- the light source can also be controlled by one or more converters with its own control, in which case these converters preferably have mutually independent brightness settings (or controls) or controls.
- the control circuit 50 has an additional input 61 which measures or detects a load dependent quantity (such as voltage, current or power).
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Description
Die vorliegende Erfindung bezieht sich auf Leuchtmittel-Betriebsgeräte mit aktiver Leistungsfaktorkorrektur ("Power Factor Control" oder "PFC") und insbesondere auf eine Schaltung mit galvanisch getrennter Leistungsfaktorkorrektur. Das technische Anwendungsgebiet der Erfindung ist insbesondere das der Versorgung und Steuerung einer Lichtquelle mittels einer solchen Schaltung.The present invention relates to power factor correction ("Power Factor Control" or "PFC") lamp power supplies, and more particularly to a power factor correction circuit. The technical field of application of the invention is in particular the supply and control of a light source by means of such a circuit.
Im Allgemeinen widerspiegelt der Leistungsfaktor die Stromentnahme eines elektrischen Geräts aus dem Stromnetz. Die Netzwechselspannung weist bekanntlich einen sinusförmigen Zeitverlauf auf und idealerweise sollte daher der vom Netz entnommene Strom ebenfalls einen sinusförmigen Zeitverlauf aufweisen. Dieser durch einen Leistungsfaktor von 1 gekennzeichnete Idealfall kommt aber nicht immer vor, vielmehr kann der Strom sogar erheblich von einer Sinus-Hüllkurve abweichen, wobei dann der Leistungsfaktor sinkt.In general, the power factor reflects the current drain of an electrical appliance from the mains. The AC line voltage is known to have a sinusoidal time course and ideally therefore the current drawn from the mains should also have a sinusoidal time characteristic. However, this ideal case, which is characterized by a power factor of 1, does not always occur, but the current can even deviate considerably from a sine wave envelope, in which case the power factor drops.
Bei einem Leistungsfaktor unter 1 ist also der entnommene Strom nicht sinusförmig, so dass Oberwellen im Netzstrom erzeugt werden. Diese unerwünschten Oberwellenströme im Versorgungsnetz werden bekanntermaßen mit Hilfe einer Leistungsfaktorkorrektur-Schaltung verringert werden.At a power factor below 1, therefore, the extracted current is not sinusoidal, so that harmonics are generated in the mains current. These unwanted harmonic currents in the supply network are known to be reduced by means of a power factor correction circuit.
Um einen sinusförmigen und sich in Phase zur Netzwechselspannung befindenden Eingangsstrom zu erreichen, ist aus dem Stand der Technik beispielsweise die Benutzung einer in
Dabei filtert ein Glättungskondensator C21 eine gleichgerichtete Eingangs-Wechselspannung Vin, die mittels eines Spannungsteilers R21, R22 gemessen wird. Die Eingangs-Wechselspannung Vin wird einer Induktivität L21 zugeführt, wobei eine Sekundärwicklung L22 die Nulldurchgänge des Stroms durch die Induktivität L21 feststellt.In this case, a smoothing capacitor C21 filters a rectified input AC voltage Vin, which is measured by means of a voltage divider R21, R22. The input AC voltage Vin is supplied to an inductor L21, and a secondary winding L22 detects the zero-crossings of the current through the inductor L21.
Weiterhin ermöglicht ein Strommesswiderstand (Shunt) R23 in Serie zu dem Schalter, bspw. in der Source-Leitung eines Transistors T21, die Erfassung des Induktivitäts-Spitzenstroms, um einen evtl. Überstromzustand feststellen zu können. Parallel zu einem Ausgangskondensator C22 ist ein zweiter Spannungsteiler R24, R25 angeordnet, um die Bus-Gleichspannung Vbus zu messen und einen Überspannungszustand bspw. aufgrund von Lastsprüngen festzustellen.Furthermore, a current measuring resistor (shunt) R23 in series with the switch, for example in the source line of a transistor T21, allows the detection of the peak inductance current in order to be able to detect a possibly overcurrent state. Parallel to an output capacitor C22, a second voltage divider R24, R25 is arranged to measure the bus DC voltage Vbus and to detect an overvoltage condition, for example, due to load jumps.
Diese vier Messungen werden mittels vier Messeingänge 21, 22, 23, 24 von einer Steuerschaltung 25 durchgeführt, wobei diese Steuerschaltung 25 abhängig von diesen Messungen den Transistor bzw. Schalter T21 derart steuert, dass die Bus-Spannung konstant bleibt und der Leistungsfaktor erhöht wird.These four measurements are carried out by means of four
Nachteilig ist es bei diesem Stand der Technik, dass die Schaltung 20 keine galvanisch getrennte Spannung liefern kann.It is disadvantageous in this prior art that the
Die
Der in
Dem Konverter 10 ist eine Leistungsfaktorkorrektur-Schaltung (nicht gezeigt) vorgeschaltet, welche als aktive Leistungsfaktorkorrektur für eine nahezu sinusförmige Stromaufnahme aus dem Netz sorgt. Diese vorgeschaltete Leistungsfaktorkorrektur-Schaltung liefert dem Konverter 10 eine hochtransformierte Bus-Gleichspannung Vin.The
Der Gegentaktwandler bzw. die Halbbrücke 11 besteht aus zwei Transistoren T11, T12, wie beispielsweise zwei MOSFET Transistoren, die parallel zu zwei Kapazitäten C11, C12 geschaltet sind. Der Mittenpunkt der zwei in Serie geschalteten Transistoren T11, T12 ist derart mit der Primärseite n1 eines Transformators verbunden, dass eine Seite dieser primären Transformatorspule n1 abwechselnd gegen eine positive und negative Spannung geschaltet ist. Die andere Seite der primären Transformatorspule n2 wird durch den kapazitiven Spannungsteiler C11, C12 auf eine feste Spannung gehalten.The push-pull converter or the
Auf der Sekundärseite n2 des Transformators wird die durch den Gegentaktwandler 11 erzeugte zerhackte Wechselspannung von der Ausgangsstufe 12 gleichgerichtet und geglättet. Die resultierende Ausgangs-Spannung Vout beträgt dann im kontinuierlichen Betrieb: Vout = f (n2/n1 * Vbus).On the secondary side n2 of the transformer, the chopped AC voltage generated by the push-
Es ist Aufgabe der vorliegenden Erfindung, eine verbesserte Schaltung zur potentialgetrennten Erzeugung einer Ausgangsspannung ausgehend von einer Netzspannung vorzuschlagen.It is an object of the present invention to propose an improved circuit for the potential-separated generation of an output voltage starting from a mains voltage.
Grundsätzliche Idee der Erfindung ist es, dass ein Teil des Stromflusses von dem Schalter der aktiven Leistungsfaktorkorrektur-Schaltung unmittelbar dem Transformator zugeführt wird und nicht erst einer Zwischenspeicherung unterzogen wird.The basic idea of the invention is that a part of the current flow from the switch of the active power factor correction circuit is supplied directly to the transformer and is not first subjected to an intermediate storage.
Eine Schaltung zur potentialgetrennten Erzeugung einer Ausgangsspannung ausgehend von einer Netzspannung kann somit eine Leistungsfaktorkorrektur-Schaltung mit einer Induktivität und einem aktiv angesteuerten Schalter aufweisen, wobei der Stromfluss von der Induktivität bzw. durch den Schalter (wenn dieser geschlossen ist) stets zu einem Teil einer Zwischenspeicherung in einem Kondensator verwendet wird, während der andere Teil des Stromflusses direkt einem Potentialtrennungs-Transformator zugeführt wird.A circuit for the potential-separated generation of an output voltage from a mains voltage can thus have a power factor correction circuit with an inductance and an actively controlled switch, wherein the current flow from the inductor or through the switch (when it is closed) always to a part of an intermediate storage in a condenser is used while the other part of the current flow is fed directly to a potential separation transformer.
Die Leistungsfaktorkorrektur-Schaltung der vorliegenden Erfindung hat einerseits die normale Aufgabe einer derartigen Schaltung, übernimmt aber andererseits auch die Funktion der Halbbrücke der
Die Ansteuerung des Leistungsfaktorkorrektur-Schalters liegt insbesondere auf Netzniveau. Wenn nunmehr die Rückführung sekundärseitig, nämlich von der Ausgangsspannung her erfolgt, muss diese Rückführung potentialgetrennt sein, um auch weiterhin eine vollständige Potentialtrennung zwischen der Eingangsseite (Netzseite) und der Ausgangsseite zu haben.The activation of the power factor correction switch is in particular at the network level. If the feedback now takes place on the secondary side, namely from the output voltage, this feedback must be electrically isolated in order to continue to have complete potential separation between the input side (mains side) and the output side.
Grundsätzlich lässt sich also die Erfindung dann vorteilhaft anwenden, wenn Anforderung an einer potentialgetrennten Ausgangsspannung besteht.In principle, the invention can then be used advantageously if there is a requirement for a potential-separated output voltage.
Die gestellte Aufgabe wird erfindungsgemäß durch die Merkmale der unabhängigen Ansprüche gelöst. Die abhängigen Ansprüche bilden den zentralen Gedanken der Erfindung in besonders vorteilhafter Weise weiter.The stated object is achieved by the features of the independent claims. The dependent claims further form the central idea of the invention in a particularly advantageous manner.
Gemäß einem ersten Aspekt der Erfindung wird ein Betriebsgerät für Leuchtmittel vorgeschlagen aufweisend eine Schaltung zur potentialgetrennten Erzeugung einer gleichgerichteten Ausgangsspannung ausgehend von einer Eingangsspannung, aufweisend:
- einen Gleichrichter zum Erzeugen der Eingangsspannung durch Gleichrichten einer Netz-Wechselspannung,
- eine aktive Leistungsfaktorkorrektur-Schaltung mit einer von der Eingangsspannung versorgten Induktivität und einem steuerbaren Schalter zur Steuerung des Ladens und Entladens der Induktivität, und
- mindestens einen Potentialtrennungs-Transformator zur galvanischen Trennung der gleichgerichteten Ausgangsspannung von der Eingangsspannung,
wobei beim Entladen der Induktivität dem Potentialtrennungs-Transformator ein erster Teil der von der Induktivität während des Ladens gespeicherten Energie direkt zugeführt wird, weiterhin aufweisend - mindestens ein Zwischenspeicherelement, insbesondere einen Kondensator zur Zwischenspeicherung eines zweiten Teils der von der Induktivität während des Ladens gespeicherten Energie und
- eine Steuerschaltung zur Erfassung der gleichgerichteten Ausgangsspannung und zur Steuerung des steuerbaren Schalters basierend auf der erfassten gleichgerichteten Ausgangsspannung.
- a rectifier for generating the input voltage by rectifying a mains AC voltage,
- an active power factor correction circuit having an inductance supplied by the input voltage and a controllable switch for controlling the charging and discharging of the inductance, and
- at least one potential separation transformer for the galvanic separation of the rectified output voltage from the input voltage,
wherein upon discharging the inductor, the potential separation transformer is directly supplied with a first portion of the energy stored by the inductor during charging, further comprising - at least one intermediate storage element, in particular a capacitor for temporarily storing a second part of the energy stored by the inductance during charging and
- a control circuit for detecting the rectified output voltage and controlling the controllable switch based on the detected rectified output voltage.
Die vom Kondensator zwischengespeicherte Energie kann dem Potentialtrennungs-Transformator vorzugsweise im nächsten Laden/Entladen Zyklus weitergeleitet werden.The energy cached by the capacitor may preferably be forwarded to the potential separation transformer in the next charge / discharge cycle.
Die Leistungsfaktorkorrektur-Schaltung kann in einem kontinuierlichen oder diskontinuierlichen Modus betrieben werden.The power factor correction circuit may be operated in a continuous or discontinuous mode.
Die Energiespeicherungs-Leistung des Kondensators kann kleiner sein als die eines Elektrolytkondensators.The energy storage performance of the capacitor may be smaller than that of an electrolytic capacitor.
Die Ausgangsspannung kann von einem Tiefpass gefiltert werden.The output voltage can be filtered by a low-pass filter.
Gemäß einem weiteren Aspekt der Erfindung wird ein Verfahren vorgeschlagen zur potentialgetrennten Erzeugung einer gleichgerichteten Ausgangsspannung in einem Betriebsgerät für Leuchtmittel, ausgehend von einer Eingangsspannung, wobei
- die Eingangsspannung von einem Gleichrichter durch Gleichrichten einer Netzspannung erzeugt wird und eine Induktivität einer Leistungsfaktorkorrektur-Schaltung versorgt,
- ein steuerbarer Schalter der Leistungsfaktorkorrektur-Schaltung das Laden und Entladen der Induktivität steuert, und
- ein Potentialtrennungs-Transformator zur galvanischen Trennung der gleichgerichteten Ausgangsspannung zur Eingangsspannung dient,
wobei ein zweiter Teil der von der Induktivität während des Ladens gespeicherten Energie von einem Zwischenspeicherelement, insbesondere von mindestens einem Kondensator zwischengespeichert wird,
wobei eine Steuerschaltung die gleichgerichtete Ausgangsspannung erfasst und den steuerbaren Schalter basierend auf der erfassten gleichgerichteten Ausgangsspannung steuert.According to a further aspect of the invention, a method is proposed for the potential-separated generation of a rectified output voltage in a lighting device, starting from an input voltage
- the input voltage is generated by a rectifier by rectifying a mains voltage and supplies an inductance of a power factor correction circuit,
- a controllable switch of the power factor correction circuit controls the charging and discharging of the inductance, and
- a potential separation transformer for the galvanic separation of the rectified output voltage to the input voltage,
wherein a second part of the energy stored by the inductance during charging is temporarily stored by a buffer element, in particular by at least one capacitor,
wherein a control circuit detects the rectified output voltage and controls the controllable switch based on the detected rectified output voltage.
Die vom Kondensator zwischengespeicherte Energie kann dem Potentialtrennungs-Transformator weitergeleitet werden.The cached energy from the capacitor can be forwarded to the potential separation transformer.
Gemäß einem weiteren ersten Aspekt der Erfindung wird eine integrierte Schaltung vorgeschlagen, die zur Durchführung eines oben beschriebenen Verfahrens ausgelegt ist.According to a further first aspect of the invention, an integrated circuit is proposed, which is designed for carrying out a method described above.
Weitere Merkmale und Vorteile der Erfindung werden deutlich beim Lesen der folgenden Beschreibung bevorzugter Ausführungsformen, die auf die Zeichnung Bezug nimmt.
- Fig. 1
- zeigt einen bekannten DC-DC Wandler zur Umwandlung einer Gleichspannung in einer galvanisch getrennten Gleichspannung"
- Fig. 2
- zeigt eine bekannte Leistungsfaktorkorrektur-Schaltung,
- Fig. 3
- zeigt eine Schaltung gemäß einem ersten Ausführungsbeispiel der Erfindung,
- Fig. 4
- zeigt eine Schaltung gemäß einem zweiten Ausführungsbeispiel der Erfindung, und
- Fig. 5
- zeigt eine Schaltung gemäß einem dritten Ausführungsbeispiel der Erfindung.
- Fig. 1
- shows a known DC-DC converter for converting a DC voltage in a galvanically isolated DC voltage "
- Fig. 2
- shows a known power factor correction circuit,
- Fig. 3
- shows a circuit according to a first embodiment of the invention,
- Fig. 4
- shows a circuit according to a second embodiment of the invention, and
- Fig. 5
- shows a circuit according to a third embodiment of the invention.
In
Eingangsseitig liegt an der Leistungsfaktorkorrektur-Schaltung 30 eine Eingangs-Spannung Vin an, die eine Leistungsfaktorkorrektur-Schaltung 31 versorgt, die wiederum eine DC-Busspannung Vbus erzeugt.On the input side, an input voltage Vin, which supplies a power
Unter "Busspannung" ist nicht etwa die Spannung einer externen Busleitung zu verstehen, sondern eine DC-Versorgungsspannung."Bus voltage" is not to be understood as the voltage of an external bus line, but a DC supply voltage.
Diese Eingangs-Wechselspannung Vin ist vorzugsweise eine von einem Gleichrichter (nicht gezeigt) gleichgerichtete Netz-Wechselspannung.This input AC voltage Vin is preferably rectified by a rectifier (not shown) AC line voltage.
Die Eingangs-Wechselspannung Vin wird einer Induktivität L31, i.e. einer Spule, zugeführt. Die Spule L31 ist mit einer Diode D31 in Serie geschaltet und zwar zwischen einem ersten mit der Eingangs-Wechselspannung Vin beaufschlagten Eingangsanschluss DC_IN/MAINS und einem zweiten Busspannungsanschluss 33, an dem die Bus-Gleichspannung Vbus bereitgestellt wird.The input AC voltage Vin is applied to an inductor L31, i.e. a coil, fed. The coil L31 is connected in series with a diode D31 between a first input terminal DC_IN / MAINS supplied with the input AC voltage Vin and a second
Ein Ausgangs-Gleichspannungskondensator C31, der vorzugsweise als Elektrolytkondensator ausgebildet ist, verbindet den Busspannungsanschluss 33 mit Masse und stabilisiert als Zwischenspeicherelement die Busspannung. Parallel zu diesem Ausgangs-Gleichspannungskondensator C31 sind auch zwei Schalter T32, T33 in Serie geschaltet. Die Schalter bzw. die Leistungsschalter T31, T32, T33 sind vorzugsweise gleich.An output DC capacitor C31, which is preferably designed as an electrolytic capacitor, connects the
Der Ausgangs-Gleichspannungskondensator C31 ist von dem Gleichrichter (nicht gezeigt), der die Eingangs-Wechselspannung gleichrichtet, über die Schaltelemente Diode D31 und Schalter T32 entkoppelt.The output DC capacitor C31 is decoupled from the rectifier (not shown), which rectifies the input AC voltage, via the switching elements diode D31 and switch T32.
An die Verbindung 32 zwischen der Spule L31 und der Diode D31 ist ein Transistor bzw. ein steuerbarer Schalter T31 angeschlossen.To the
Zwischen der Drain-Leitung 32 des Schalters T31 und dem Mittenpunkt 34 der Schalter T32, T33 sind die Primärseite N1 eines ersten Transformators N1-N2 und die Primärseite N1' eines zweiten Transformators N1'-N2' in Serie angeschlossen. Auch wenn beide Transformatoren N1-N2, N1'-N2' unterschiedlich sein können, sind sie vorzugsweise gleich dimensioniert.Between the
Wenn der Schalter T31 eingeschaltet ist, ist die Spule L31 gegen Masse kurzgeschlossen und die Diode D31 gesperrt. Die Spule L31 lädt sich auf, so dass eigentlich Energie in dieser Spule L31 gespeichert werden kann.When the switch T31 is turned on, the coil L31 is shorted to ground and the diode D31 is turned off. The coil L31 charges, so that actually energy can be stored in this coil L31.
Bei eingeschaltetem Schalter T31 fließt also vom Netz Vin über die Spule L31 ein Strom durch den Schalter T31.Thus, when the switch T31 is switched on, a current flows through the switch T31 from the mains Vin via the coil L31.
Eine weitere Stromkomponente kommt indessen von dem Mittenpunkt der Schalter T32, T33 über die Primärseite des Transformators N1, N2 durch den Schalter T31.However, another current component comes from the midpoint of the switches T32, T33 across the primary side of the transformer N1, N2 through the switch T31.
Bei geöffnetem Schalter reiht die Spule L31 bekannterweise einen Strom über die Diode D31. Das heißt, dass die Diode D31 leitend ist und, dass die Spule L31 sich dann über die Diode D31 in den Ausgangs-Gleichspannungskondensator C31 entlädt. Die Energie wird dadurch an den Ausgangs-Gleichspannungskondensator C31 übertragen.When the switch is open, the coil L31 is known to string a current through the diode D31. That is, the diode D31 is conductive and that the coil L31 then via the diode D31 in the output DC capacitor C31 discharges. The energy is thereby transmitted to the output DC capacitor C31.
Eine weitere Stromkomponente fließt indessen nunmehr von dem Verbindungspunkt 32 zwischen dem Schalter T31 und der Diode D31 wiederum (diesmal in umgekehrter Richtung) über die Primärseite N1 des Transformators N1, N2 zu dem Mittenpunkt 34 der Schalter T32, T33.Meanwhile, another current component now flows from the
In einem Ein- und Ausschalten Zyklus des Schalter T31 wird erfindungsgemäß nur ein Teil des fließenden Stroms zum Ausgangs-Kondensator C31 und zur Busspannung Vbus zugeführt. Gemäß dem Stand der Technik hingegen fließt der ganze Strom zur Busspannung, siehe
Die Sekundärseiten N2 und N2' der Transformatoren N1-N2 und N1'-N2' sind in Serie geschaltet und jeweils mit einer Diode D32, D33 verbunden. Diese zwei Dioden D32, D33 sind auch an einem Punkt 36 miteinander angeschlossen.The secondary sides N2 and N2 'of the transformers N1-N2 and N1'-N2' are connected in series and each connected to a diode D32, D33. These two diodes D32, D33 are also connected together at a
Die Spannung, die sich zwischen dem Mittenpunkt 35 der Transformatoren N1-N2, N1'-N2' und dem Verbindungspunkt 36 der Dioden D32, D33 ergibt, wird dann einem Tiefpass zugeführt und dementsprechend gefiltert bzw. gemittelt.The voltage which results between the
Dieser Tiefpass besteht beispielsweise aus einer Drossel L32 und einem Ausgangskondensator C32, wobei am Ausgangskondensator C32 sich die Ausgangs-Spannung Vout ergibt.This low-pass filter consists for example of a choke L32 and an output capacitor C32, wherein the output voltage Vout results at the output capacitor C32.
Die beiden Schalter bzw. MOSFET-Transistoren T32, T33 können von der Steuerschaltung 50 synchronisiert mit dem Schalter T31 angesteuert werden. Beispielsweise kann der Schalter T32 synchron zu dem Schalter T31 eingeschaltet und gegebenenfalls auch ausgeschaltet werden. Der Schalter T33 kann dagegen dann eingeschaltet werden, wenn der Schalter T31 und gegebenenfalls auch der Schalter T32 durch die Steuerschaltung 50 geöffnet wird. Der Ein- und oder Ausschaltzeitpunkt der Schalter T32, T33 kann aber auch durch die Regelschleife oder aufgrund der anliegenden Last gewählt werden. Um einen Halbbrückenkurzschluß zu vermeiden, kann eine Totzeit vor dem Einschalten des Schalters T32 oder des Schalters T33 eingefügt werden. Dieser synchrone Betrieb kann vor allem bei einem Betrieb mit hoher Last, beispielsweise maximaler Helligkeit des angeschlossenen Leuchtmittels, angewendet werden.The two switches or MOSFET transistors T32, T33 can be controlled by the
Im Falle eines vom Betrieb mit hoher Last, beispielsweise maximaler Helligkeit des angeschlossenen Leuchtmittels, abweichenden Betriebsmodus kann es erforderlich sein, die Ansteuerung der beiden Schalter T32, T33 zu ändern. Ein solcher Betriebsmodus kann beispielsweise vorliegen, wenn keine Last, nur eine geringe Last anliegt oder ein Fehler wie beispielsweise ein Leerlauffall oder auch ein Lastkurzschluß vorliegt. Beispielsweise kann die Taktfrequenz der beiden Schalter erhöht werden, wobei es möglich sein kann, dass durch die Steuereinheit einer der beiden Schalter T32, T33 synchron zu dem Schalter T31 eingeschaltet wird, die beiden Schalter T32, T33 aber dann mit höherer Frequenz getaktet werden. Es kann gegebenenfalls auch Zeiträume geben, in denen entweder beide oder nur ein Schalter nicht getaktet werden. Auf diese Weise ist ein sogenannter Burst-Betrieb möglich.In the case of an operating mode deviating from operation with a high load, for example maximum brightness of the connected lighting means, it may be necessary to change the control of the two switches T32, T33. Such an operating mode may be present, for example, when no load, only a small load is applied or an error such as an idle case or a load short circuit is present. For example, the clock frequency of the two switches can be increased, it being possible for the control unit to switch one of the two switches T32, T33 in synchronism with the switch T31, but the two switches T32, T33 can then be clocked at a higher frequency. If necessary, there may also be periods in which either both or only one switch is not clocked. In this way, a so-called burst operation is possible.
Es ist aber auch möglich, die Schalter T31, T32 und T33 asynchron zuneinander zu betreiben.But it is also possible to operate the switches T31, T32 and T33 asynchronously to each other.
Die Diode D31 kann auch durch einen weiteren Schalter T34 ersetzt werden, der dann ebenfalls durch die Steuereinheit aktiv getaktet und kontrolliert wird. Die Schalter T31-T34 können synchron oder asynchron, im Burst-Betrieb oder in einer weiteren Betriebsart betrieben werdenThe diode D31 can also be replaced by a further switch T34, which is then also actively clocked and controlled by the control unit. The switches T31-T34 can be operated synchronously or asynchronously, in burst mode or in another operating mode
Die Leistungsfaktorkorrektur-Schaltung hat sich gegenüber
Die Schalter T32, T33 sind in dieser Ausführungsform nicht mehr vorgesehen.The switches T32, T33 are no longer provided in this embodiment.
Parallel zu jedem Kondensator C41, C42 ist eine Diode D41, D42 geschaltet, wobei der Mittenpunkt 34' der Kondensatoren C41, C42 und somit auch der Dioden D41, D42 mit der Serienanordnung der beiden Transformatoren N1-N2, N1'- N2' verbunden ist.A diode D41, D42 is connected in parallel with each capacitor C41, C42, the
Die Funktionsweise der Schaltung 40 ist ähnlich wie die der in
Somit wird in jedem Zyklus ton-toff des Schalters T31 ein Teil des fließenden Stroms zur Busspannung Vbus zugeführt, während der andere Teil unmittelbar in die Primärseiten N1, N1' der Transformatoren N1-N2, N1'-N2' fließt.Thus, in each cycle ton-toff of the switch T31, part of the flowing current is supplied to the bus voltage Vbus, while the other part flows directly into the primary sides N1, N1 'of the transformers N1-N2, N1'-N2'.
Erfindungsgemäß wird dementsprechend der direkt durch die Transformatoren N1-N2, N1'- N2' umgesetzte Anteil, der also nicht zum Halten der Busspannung Vbus über die Elektrolytkondensatoren C41, C42 dient, direkt und verlustfreier umgesetzt.According to the invention, the proportion converted directly by the transformers N1-N2, N1'-N2 ', which thus does not serve to hold the bus voltage Vbus via the electrolytic capacitors C41, C42, is converted directly and without loss.
Infolgedessen können die Kondensatoren C41, C42 gemäß
Es ist ggf. sogar möglich, für die Kondensatoren C41, C42 auf Elektrolytkondensatoren zu verzichten. Dies bringt ggf. Kostenvorteile und Lebensdauervorteile.It may even be possible to dispense with electrolytic capacitors for the capacitors C41, C42. This brings, if necessary, cost advantages and lifetime benefits.
Auf jeden Fall kann durch die Direktumsetzung eines Teiles des Stromflusses Kapazität der Elektrolytkondensatoren C41, C42 deutlich verringert werden.In any case, the direct conversion of part of the current flow can significantly reduce the capacitance of the electrolytic capacitors C41, C42.
Von den zwei beschriebenen Ausführungsformen 30, 40 hat die Schaltungsausführungsform 30 gemäß
Dieser Mehraufwand zum Betreiben bzw. Kontrollieren der Schaltung 30, entfällt hingegen bei der Schaltungsausführungsform 40 gemäß
Alternativ kann erfindungsgemäß auch die Schaltungstopologie der in
Der Schalter T31 wird von einer Steuerschaltung 50 angesteuert. Zu diesem Zweck weist die Steuerschaltung 50 einen Ausgang 51 auf, über den dem Schalter T31 ein Steuersignal zugeführt wird. Die Frequenz des Steuersignals (typischerweise mindestens 10 kHz) und daher des Ein- und Ausschaltens des Schalters 306 ist wesentlich höher als die Frequenz der Netzspannung (typischerweise 50 Hz) und der gleichgerichteten Eingang-Wechselspannung (typischerweise 100 Hz).The switch T31 is driven by a
Zur Bestimmung der Einschalt-Zeitdauer ton bzw. der Ausschalt-Zeitdauer toff des Schalters T31 benötigt die Steuerschaltung 50 Informationen über die Bus-Spannung Vbus (bzw. über die Ausgangsspannung Vout) bzw. über den Nulldurchgang des Stroms durch die Spule L31.In order to determine the switch-on time t on or the switch-off time toff of the switch T31, the
Dies deshalb, da die Einschalt-Zeitdauer ton des Schalters T31 und damit die Ladezeit der Spule L31 auf Grundlage eines Vergleichs der Bus-Gleichspannung Vbus mit einer festen Bezugsspannung gesteuert wird und auf Grundlage der Vorgabe, dass die Steuerschaltung 50 den Schalter T31 solange ausschaltet, bis der Strom durch die Spule 301 auf Null abgesunken ist.This is because the turn-on time t on of the switch T31, and hence the charging time of the coil L31 is controlled based on a comparison of the bus DC voltage Vbus with a fixed reference voltage, and on the assumption that the
Die Information über den Nulldurchgang des Stroms durch die Spule L31 wird eigentlich nur im diskontinuierlichen Betrieb benötigt, in welchem der Spulenstrom tatsächlich in jeder Periode auf Null absinkt. Im kontinuierlichen Betrieb hingegen geht der Spulenstrom bei Ausschalten des Schalters T31 nicht auf Null zurück, so dass diese Nulldurchgang-Information auch nicht notwendig ist.The information about the zero crossing of the current through the coil L31 is actually only in the discontinuous Operation is required in which the coil current actually drops to zero in each period. In continuous operation, however, the coil current does not go back to zero when the switch T31 is turned off, so that this zero-crossing information is also not necessary.
Für die Leistungsfaktorkorrektur können auch Informationen über die Eingangs-Spannung Vin oder den Spitzenstroms durch die Spule L31 benötigt werden, im Letzteren Fall insbesondere um Überstromzustände zu verhindern.For the power factor correction, information about the input voltage Vin or the peak current through the coil L31 may be needed, in the latter case in particular to prevent overcurrent conditions.
Festzuhalten bleibt also, dass die Steuerschaltung 50 die Bus-Gleichspannung Vbus oder die Ausgangsspannung Vout kennen muss und ggf. auch noch die Eingangs-Spannung Vin, den Nulldurchgang des Spulenstroms oder den Spulenspitzenstrom.It should therefore be noted that the
Wie bereits aus
Allerdings im Unterschied zum Stand der Technik, bei der die Steuerschaltung 25 die Busspannung Vbus sowie den Verlauf der Netzeingangsspannung Vin über zwei Spannungsteiler R21, R22 und R24, R25 überwacht, kann die Ansteuerung des Schalters T31 den Verlauf der Netzspannung sowie die Ausgangsspannung an dem Filter C32, L32 erfassen.However, in contrast to the prior art, in which the
Die dazwischenliegende Busspannung Vbus wird dagegen nicht mehr erfasst.The intermediate bus voltage Vbus, however, is no longer detected.
Dies ist möglich, da die Busspannung Vbus über die Transformatoren N1-N2, N1'-N2' mit der Ausgangsspannung Vout "hart" verkoppelt ist, so dass sich etwaige unzulässige Zustände bei der Busspannung Vbus unmittelbar in der Ausgangsspannung Vout erkennen lassen würden.This is possible because the bus voltage Vbus is "hard" coupled to the output voltage Vout via the transformers N1-N2, N1'-N2 ', so that any impermissible states at the bus voltage Vbus could be detected directly in the output voltage Vout.
Alternativ kann bspw. das Leuchtmittel mittels eines nachfolgenden Konverters (nicht gezeigt) angesteuert werden. Dieser nachfolgende Konverter kann eine einfache Konstant-Stromquelle sein. Das Leuchtmittel kann aber auch von einem oder mehreren Konvertern mit eigener Regelung angesteuert werden, wobei dann diese Konverter vorzugsweise voneinander unabhängige Helligkeits-Einstellungen (bzw. -Steuerungen)oder -Regelungen aufweisen.Alternatively, for example, the lighting means by means of a subsequent converter (not shown) can be controlled. This subsequent converter can be a simple constant current source. However, the light source can also be controlled by one or more converters with its own control, in which case these converters preferably have mutually independent brightness settings (or controls) or controls.
Die Steuerschaltung 50 weist einen zusätzlichen Eingang 61 auf, der eine lastabhängige Größe (wie bspw. Spannung, Strom oder Leistung) misst bzw. erfasst.The
Claims (10)
- Operating device for luminous means, having a circuit (30, 40) for producing a rectified output voltage (Vout) in a potential-isolated manner starting from an input voltage (Vin), having- a rectifier for producing the input voltage (Vin) by rectifying a mains AC voltage,- an active power factor correction circuit (31) having an inductance (L31) supplied by the input voltage (Vin) and a controllable switch (T31) for controlling the charging and discharging of the inductance (L31), and- at least one potential-isolation transformer (N1-N2, N1'-N2') for galvanically isolating the rectified output voltage (Vout) from the input voltage (Vin), wherein, during the discharging of the inductance (L31), a first portion of the energy stored by the inductance (L31) during the charging is fed directly to the potential-isolation transformer (N1-N2, N1'-N2'), also having- at least one intermediate storage element, in particular a capacitor (C31) for intermediate storage of a second portion of the energy stored by the inductance (L31) during the charging, and- a control circuit (50) for detecting the rectified output voltage (Vout) and for controlling the controllable switch (T31) on the basis of the detected rectified output voltage (Vout).
- Operating device for luminous means according to Claim 1,
wherein the energy stored intermediately by the capacitor (C31) is transferred to the potential-isolation transformer (N1-N2, N1'-N2'), preferably in the next charging/discharging cycle. - Operating device for luminous means according to one of the preceding claims,
wherein the power factor correction circuit (31) is operated in a continuous or discontinuous mode. - Operating device for luminous means according to either of the preceding claims,
wherein the intermediate storage element is formed from two capacitors (C41, C42) connected in series. - Operating device for luminous means according to one of the preceding claims,
wherein the rectified output voltage (Vout) is filtered by a low-pass filter (L32, C32). - Operating device for luminous means according to one of the preceding claims,
characterized
in that it is a light-emitting diode converter. - Lighting unit having at least one luminous means and an operating device according to one of the preceding claims.
- Method for producing a rectified output voltage (Vout) in a potential-isolated manner in an operating device for luminous means, starting from an input voltage (Vin), wherein- the input voltage (Vin) is produced by a rectifier by rectifying a mains voltage and supplies an inductance (L31) of a power factor correction circuit (31),- a controllable switch (T31) of the power factor correction circuit (31) controls the charging and discharging of the inductance (L31), and- a potential-isolation transformer (N1-N2, N1'-N2') is used to galvanically isolate the rectified output voltage (Vout) with respect to the input voltage (Vin), wherein, during the discharging of the inductance (L31), a first portion of the energy stored by the inductance (L31) during the charging is fed directly to the potential-isolation transformer (N1-N2, N1'-N2'), wherein a second portion of the energy stored by the inductance (L31) during the charging is intermediately stored by an intermediate storage element, in particular by at least one capacitor (C31),wherein a control circuit (50) detects the rectified output voltage (Vout) and controls the controllable switch (T31) on the basis of the detected rectified output voltage (Vout).
- Method according to Claim 8,
wherein the energy stored intermediately by the capacitor (C31) is transferred to the potential-isolation transformer (N1-N2, N1'-N2'). - Integrated circuit, in particular ASIC, characterized in that it is designed to perform a method according to either of Claims 8 and 9.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007057312A DE102007057312A1 (en) | 2007-11-28 | 2007-11-28 | Active power factor correction, for example in an LED converter |
PCT/EP2008/009821 WO2009068220A2 (en) | 2007-11-28 | 2008-11-20 | Illumination means operating device, particularly for leds, with electrically isolated pfc |
Publications (2)
Publication Number | Publication Date |
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EP2225918A2 EP2225918A2 (en) | 2010-09-08 |
EP2225918B1 true EP2225918B1 (en) | 2013-10-02 |
Family
ID=40524982
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Application Number | Title | Priority Date | Filing Date |
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EP08853422.7A Not-in-force EP2225918B1 (en) | 2007-11-28 | 2008-11-20 | Illumination means operating device, particularly for leds, with electrically isolated pfc |
Country Status (5)
Country | Link |
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EP (1) | EP2225918B1 (en) |
CN (1) | CN101878675B (en) |
AT (1) | AT12747U1 (en) |
DE (1) | DE102007057312A1 (en) |
WO (1) | WO2009068220A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US10158284B2 (en) | 2015-03-27 | 2018-12-18 | Tridonic Gmbh & Co Kg | PFC with stacked half-bridges on DC side of rectifier |
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DE102009044593B4 (en) * | 2009-11-19 | 2018-07-12 | Vossloh-Schwabe Deutschland Gmbh | Operating control device for operating a light source |
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US6034489A (en) * | 1997-12-04 | 2000-03-07 | Matsushita Electric Works R&D Laboratory, Inc. | Electronic ballast circuit |
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DE4025322A1 (en) * | 1990-08-10 | 1992-02-13 | Thomson Brandt Gmbh | MAINS OPERATED PHASE CONTROL CONTROL |
US5510974A (en) * | 1993-12-28 | 1996-04-23 | Philips Electronics North America Corporation | High frequency push-pull converter with input power factor correction |
US5568041A (en) * | 1995-02-09 | 1996-10-22 | Magnetek, Inc. | Low-cost power factor correction circuit and method for electronic ballasts |
US6008589A (en) * | 1996-03-05 | 1999-12-28 | California Institute Of Technology | Single-switch, high power factor, ac-to-ac power converters |
US6181079B1 (en) * | 1999-12-20 | 2001-01-30 | Philips Electronics North America Corporation | High power electronic ballast with an integrated magnetic component |
US6429604B2 (en) * | 2000-01-21 | 2002-08-06 | Koninklijke Philips Electronics N.V. | Power feedback power factor correction scheme for multiple lamp operation |
US7122972B2 (en) * | 2003-11-10 | 2006-10-17 | University Of Hong Kong | Dimmable ballast with resistive input and low electromagnetic interference |
US7659673B2 (en) * | 2004-03-15 | 2010-02-09 | Philips Solid-State Lighting Solutions, Inc. | Methods and apparatus for providing a controllably variable power to a load |
US20070040516A1 (en) | 2005-08-15 | 2007-02-22 | Liang Chen | AC to DC power supply with PFC for lamp |
JP2007097320A (en) * | 2005-09-29 | 2007-04-12 | Fuji Electric Device Technology Co Ltd | Power conversion circuit |
-
2007
- 2007-11-28 DE DE102007057312A patent/DE102007057312A1/en not_active Withdrawn
-
2008
- 2008-11-20 AT ATGM470/2011U patent/AT12747U1/en not_active IP Right Cessation
- 2008-11-20 CN CN200880118337.5A patent/CN101878675B/en not_active Expired - Fee Related
- 2008-11-20 EP EP08853422.7A patent/EP2225918B1/en not_active Not-in-force
- 2008-11-20 WO PCT/EP2008/009821 patent/WO2009068220A2/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US6034489A (en) * | 1997-12-04 | 2000-03-07 | Matsushita Electric Works R&D Laboratory, Inc. | Electronic ballast circuit |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10158284B2 (en) | 2015-03-27 | 2018-12-18 | Tridonic Gmbh & Co Kg | PFC with stacked half-bridges on DC side of rectifier |
Also Published As
Publication number | Publication date |
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CN101878675A (en) | 2010-11-03 |
WO2009068220A2 (en) | 2009-06-04 |
AT12747U1 (en) | 2012-10-15 |
CN101878675B (en) | 2014-04-02 |
DE102007057312A1 (en) | 2009-06-04 |
WO2009068220A3 (en) | 2010-02-25 |
EP2225918A2 (en) | 2010-09-08 |
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