WO2010143944A1 - Dispositif de correction de facteur de puissance pour circuit de gradation - Google Patents

Dispositif de correction de facteur de puissance pour circuit de gradation Download PDF

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Publication number
WO2010143944A1
WO2010143944A1 PCT/NL2010/050054 NL2010050054W WO2010143944A1 WO 2010143944 A1 WO2010143944 A1 WO 2010143944A1 NL 2010050054 W NL2010050054 W NL 2010050054W WO 2010143944 A1 WO2010143944 A1 WO 2010143944A1
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Prior art keywords
power factor
factor corrector
circuit
coupled
parallel
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Ceased
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PCT/NL2010/050054
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English (en)
Inventor
Riccardo Arthur De Wet
Franciscus Adrianus Steur
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ONLINE SERVICES BV
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ONLINE SERVICES BV
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Priority claimed from NL2003011A external-priority patent/NL2003011C2/en
Priority claimed from NL2003677A external-priority patent/NL2003677C2/en
Priority claimed from NL1037553A external-priority patent/NL1037553C2/en
Application filed by ONLINE SERVICES BV filed Critical ONLINE SERVICES BV
Publication of WO2010143944A1 publication Critical patent/WO2010143944A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • 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
    • 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
    • H05B41/295—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 with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps

Definitions

  • TITLE Power factor corrector device for a dimming circuit.
  • the invention relates to a power factor corrector device for a dimming circuit.
  • ballast has evolved from the already mentioned electromagnetic to the sophisticated electronic types of today. Specifically, for the operational low- voltage halogen-incandescent luminaries they have even adopted the general commercial term of electronic transformers, with its implied meaning of simple voltage-down-converters (nominally 230 Volts AC household mains potential being in this case a relative high-voltage source.).
  • LED lamps controllers Thanks mainly to the amalgamation of the active components into integrated-circuits (ICs) and SMD (Surface-Mounted Devices) passive components generally available today, these LED lamps controllers have become very compact and attractive for being implemented within the tight enclosures of household-type incandescent and Compact Fluorescent Lamps (CFLs) of similar geometry and volume; thereby increasing its desirability.
  • ICs integrated-circuits
  • SMD Surface-Mounted Devices
  • SMPS Switching-Mode Power-Supplies
  • the present invention aims to offer a price -and performance- competitive power factor corrector device for a dimming circuit that does not rely on source-scarce and relative expensive ICs: as their core, their source- power interface, as well as all their enhanced features.
  • a power factor corrector device into a ballast device standard topology from end to end design that can be applied and easily extrapolated to a complete range and type of lamps of diverse power and applications.
  • a capacitive, two- terminal passive power factor corrector device is provided according to the features of claim 1.
  • a power factor corrector circuit comprising at least one capacitor, to be coupled to a low frequency DC bridge rectifier output; the power factor corrector circuit including a flyback diode coupled in parallel over said at least one capacitor; and a clamping capacitor coupled in parallel to the power factor corrector circuit adapted to clamp a high frequency ripple of a high-frequency switching-mode ballast device.
  • a high-frequency switching-mode ballast device for a dimming circuit
  • the ballast device comprising: a bridge rectifier section having an AC input and a DC bridge rectifier output; a high frequency oscillator circuit including a main ballast coil assembly, coupled to the DC bridge rectifier output; and a power factor corrector device comprising a power factor corrector circuit and a clamping capacitor.
  • a dimmable CFL high-frequency switching-mode ballast device for a dimming circuit
  • the ballast device comprising: a power factor corrector circuit and a clamping capacitor coupled in parallel with the power factor corrector circuit.
  • a dimmable energy saving lamp comprising a light-transducer low-pressure gas tube including filaments arranged for starting the tube light transducing process; a high-frequency switching-mode ballast device for driving the gas tube, the ballast device comprising a bridge rectifier section having an AC input and a DC bridge rectifier output; a high frequency oscillator circuit coupled to the bridge rectifier output; and a main ballast coil assembly coupled to the oscillator circuit and arranged in series with the gas tube filaments; and further comprising a power factor corrector device comprising a power factor corrector circuit and a clamping capacitor coupled in parallel with the power factor corrector circuit.
  • the passive elements employed in the power factor corrector device provide the device with an impedance of a primarily capacitive character seen between the two terminals.
  • the overall effect of the power factor corrector circuit is to extend as much as possible the -otherwise severely restricted- angle of conducted current drawn from the supply line.
  • This power factor corrector device The overall effect of this power factor corrector device is to counter act a source for EMC induced by the power factor corrector circuit before it enters the ballast device.
  • the power factor corrector device is suited to be implemented in a dimming circuit as well as in a ballast device.
  • Fig 1 Block diagram of a dimming circuit for a LED lamp
  • Fig 2 Detailed circuit diagram of a 3W dimmable LED lamp according to the block diagram of Figure 1.
  • Fig. 3 Layout scheme of Power Factor Corrector circuit.
  • Fig. 4 Block diagram of Fig. 1 including the LED lamp.
  • Fig 5 Block diagram of the CFL
  • Fig 6 Detailed circuit diagram of Figure 5.
  • Fig. 7 Standard circuit diagram of a conventional HW CFL.
  • Fig. 8 Circuit diagram of a modified power factor corrector device
  • FIG. 9 Mechanical construction diagram of the power factor corrector device of fig. 9 Fig. 10: Detailed circuit diagram of another CFL Fig. 11 Pair of E-cores with primary and secondary coils In the figures, similar or corresponding elements will be addressed using the same reference numerals. Fig. 12. EMC frequency sweep of a CFL;
  • Fig. 13 EMC frequency sweep of a CFL with a Power Factor Corrector device
  • the Power factor (PF) is defined as the cosine of the phase-angle between the load's voltage and current waves, which is a unit-less number between 1 and 0.
  • the voltages and current waves are out-of-step, and only part of the energy supplied is consumed by the load, the rest being cyclically absorbed and then reflected back, at the frequency of the AC supply (in standard reticulation distribution, meaning 50 or 60 Hz).
  • Purely inductive or pure capacitive loads consume no power on average, but merely cyclically absorb and reflect the input power totally. Importantly then, the closer the PF is to
  • AC mains is divided into four areas:
  • dimmers are of the phase-cut topology and have at their core a high- voltage AC bipolar gating-controller device, an industry- standard electronic component known as a TRIAC.
  • TRIAC high- voltage AC bipolar gating-controller device
  • These dimmers being low-cost due to their small component count, have historically been -and they still are- the most popular brightness controller for incandescent luminaries, hence their wide use in the average household, worldwide.
  • their electronic design principle is fairly standard, their actual manufacture implementation still differs quite a lot from brand to brand.
  • TRIAC device all have a specific - and perhaps diverse- maximum power-handling capability.
  • a fixed resistor of relative medium K-ohms value helps to equalize the performance of many disparate dimmer devices, especially at low brightness levels, as it presents a constant and fixed minimum working load to the wide-spread brands and types of light- controlling TRIAC-core products commercially available in the marketplace: their average response become smoother, less prone to flickering, less noisy, a more reliable operational life-span can be expected, and their general performance becomes more predictable.
  • Some contributions may include:
  • the dimmer's gating device (the TRIAC core) with a minimum load current to keep it conducting for a longer angle span, especially at the critical low-brightness dimming settings, when the avoidance of flickering is highly desirable, not only just for aesthetics but also due to sound electronic design principles.
  • a Power-Factor Corrector is an electronic sub-circuit 400 needed to help reduce as much as possible the phase- shift between the input Voltage and Current wave fronts due to the presence of a complex/non-linear load.
  • a passive power factor corrector has been chosen for its simplicity, robustness, low-cost and, - as the provided comparative tests will confirm - it's very promising results.
  • the power factor corrector according to an aspect of the invention is practically realized by the integration within a single component sub- assembly (resembling an ordinary polarized 2-terminal electrolytic capacitor) of an electrical network of 2 capacitors and 3 rectifier diodes, placed just after the bridge rectifier 200, superseding a single reservoir capacitor characteristic of standard Low-PF lamps and at the same classical position.
  • the overall effect of this network is to extend as much as possible the - otherwise severely restricted - angle of conducted Current drawn from the Supply line within the reference of the positive and the negative excursions of the input Voltage mains cycle/period.
  • the power factor corrector circuit 400 comprises a two-terminal network of three serially switched diodes; wherein first and second diodes are coupled in parallel with a first polarized capacitor and wherein second and third diodes are coupled in parallel with a second polarized capacitor; the two-terminal network coupled in parallel to the bridge converter.
  • the flyback diodes D4, D5, D6 or steering diodes make the capacitors' distributed overall charging and discharging process (from the supply and to the load respectively) smoother, predictable, balanced, self-adjusting and more independent of the load's demands.
  • the present invention accordingly provides a front- end, highly efficient passive high power factor correction.
  • the power factor corrector circuit 400 is preferably designed as a two pin connectable device.
  • the input impedance of the CFL now becomes less reactive, therefore with a marked and more defined resistive behaviour than was originally predicted if no power factor corrector were to be implemented. Much less energy bounces-back towards the supply-lines: the tiny harmonics are greatly restricted and the harmonic distortion is brought within acceptable specification's margins.
  • FIG. 2 refers to a detailed block diagram showing practical implementation of the device.
  • a high-frequency switching-mode ballast device 100 for a dimming circuit the ballast device 100 comprising a bridge rectifier section 200 having an AC input 201; 202 and a DC bridge rectifier output 203; 204; a high frequency oscillator circuit 300 including a main ballast coil assembly 350, coupled to the DC bridge rectifier output 203; 204; and further comprising a power factor corrector circuit 400 comprising at least one capacitor C6, C7, coupled in parallel to the DC bridge rectifier output 203; 204; the power factor corrector circuit 400 including a flyback diode D4, D5, D6 coupled in parallel over said at least one capacitor C6, C7.
  • a resistive network (210) may be coupled to the DC bridge rectifier input to further enhance the power factor.
  • Figure 3 shows a detailed layout scheme for the power factor corrector functional circuit which may be applied in other electrical layouts for improving a power factor.
  • Figure 4 shows an embodiment, wherein the dimming circuit is arranged for driving a (H-B) LED 60.
  • a LED is a current- driven energy-transducer device and can be driven electrically only by a direct (unipolar or single polarity -generally labelled as DC-) energy-source. Its maximum normalized current has a tight specification and can not otherwise be exceeded without a predictable sure failure: in electronic terms it has a very low dynamic impedance. Therefore the control of its current is the most important requirement for the associated electronic driver.
  • H-B LED devices are basically designed for constant current operation to attaint their maximum specified efficiency, therefore there is a general perception that they can not be directly dimmable by voltage drivers means.
  • the present invention provides a voltage driven and dimming control design for a LED device.
  • the LED-device according to the invention comprises a ballast device providing a voltage driven dimming control design.
  • block element 50 for driving the HB-LED 60, block element 50 references a high- frequency AC to DC rectifier and ripple-compensation network. Since the LED devices are essentially unipolar in their normal operational drive requirements, a high frequency and efficient AC to DC conversion is implemented in the present invention. The use of an inverse fast-recovery full-wave rectifier diode-bridge configuration aids to this purpose in a simple, compact and robust way, which rating can as well be scaled to each particular LED lamp nominal power output.
  • the driver is of a fixed frequency, and no frequency control is required.
  • an optional and proportionally rated relative low voltage electrolytic capacitor could be added in parallel with the output DC polarized terminals of the high-frequency rectifier diode-bridge to aid to minimize any onset of flickering behaviour that could appear on the LED devices at very low brightness levels, if so required. It could, as well, help to the generally smoother transitional operation of the dimmer controller itself, as it is exercised throughout its full range.
  • ballast devices for CFLs.
  • the problem is not the household dimmer or the CFLs themselves.
  • the reason for this poor performance resides mainly in the electronic-properties (characteristic impedance) miss-match between them.
  • An AC complex-impedance-load is therefore one that has some resistance AND some reactance values.
  • the reactive components of the load are the cause of losses and wasted applied energy; therefore, the aim of any good engineering electronics AC design is to keep the resistive/reactive-ratio of the load as high as possible in order to obtain the maximum desirable -but practical(i.e. cost-effective)- energy-transfer (efficiency) effect.
  • One way to express this important ratio is called: the Power- Factor of the load.
  • Another way (mainly concerning known complex loads) might be: the relative index of the load's capability to do real work.
  • Power-Factor can be described as the resultant amount of phase-shift angle between Voltage and Current that can be induced by any load (with some reactive component/s in them) when an AC electrical source-energy is applied to it.
  • the magnitude of the PF is defined as the value of the cosine of said angle, therefore, a unit-less number between 1 and O.
  • a CFL is composed of a few dozen different electronic components, but basically can be thought-of a miniature high-frequency switching-mode power supply (HFSMPS) driving a light-transducer low-pressure gas tube 160.
  • HFSMPS high-frequency switching-mode power supply
  • PS Power Supply
  • a Power-Factor Corrector is an electronic sub-circuit needed to help reduce as much as possible the phase- shift between the input Voltage and Current wave fronts due to the presence of a complex/non-linear load.
  • a passive power factor corrector has been chosen for its simplicity, robustness, low-cost and, —as the provided comparative tests will confirm-, its very promising results.
  • the power factor corrector according to one aspect of the invention is practically realized by the integration within a single component sub- assembly (resembling an ordinary polarized 2-terminal electrolytic capacitor) of an electrical network of 2 capacitors and 3 rectifier diodes, placed just after the bridge rectifier B2, superseding the single reservoir capacitor characteristic of standard Low-PF lamps and at the same classical position.
  • the overall effect of this network is to extend as much as possible the — otherwise severely restricted- angle of conducted Current drawn from the Supply line within the reference of the positive and the negative excursions of the input Voltage mains cycle/period.
  • the power factor corrector circuit Al comprises a two-terminal network of three serially switched diodes, wherein the first and second diodes are coupled in parallel with a first polarized capacitor and wherein the second and third diodes are coupled in parallel with a second polarized capacitor; the two-terminal network is coupled in parallel to the bridge converter.
  • the flyback diodes (D4, D5, D6) or steering diodes make the capacitors' distributed overall charging and discharging process (from the supply and to the load respectively) smoother, predictable, balanced, self- adjusting and more independent of the load's demands.
  • the overall input D4, D5, D6 or steering diodes
  • the power factor corrector circuit Al is preferably designed as a two pin connectable device.
  • the input impedance of the CFL now becomes less reactive, therefore with a marked and more defined resistive behaviour than was originally predicted if no power factor corrector were to be implemented. Much less energy bounces-back towards the supply-lines: the tiny harmonics are greatly restricted and the harmonic distortion is brought within acceptable specification's margins.
  • the A2 block of Figure 5 is a schematic illustration of a low pass filter including an inductor A2 coupled in parallel to the power factor corrector circuit Al to provide a low pass filter. More particularly, an L-R High Frequency Low-Pass Filter (HF-LPF) A2 is configured in series with the total circuit load's current-return-path 130.
  • HF-LPF High Frequency Low-Pass Filter
  • Harmonic distortion can be measured with specialized relative low-frequency response analyzers (up to the 40 th Harmonic of the fundamental Mains frequency, -50 or 60 Hz.-, that means roughly up to 25KHz or so.).
  • the current pass- specification usually keeps a special watch for the third and the fifth ones, still within the realm of very low frequencies, indeed.
  • the power source is a theoretical constant sinusoidal one, and the load is relatively stable, the upper terms of the harmonic distortion will be greatly reduced. Therefore, with just a properly rated and good performance power factor corrector device added to any CFL's front-end, their overall electronic design will be expected to be within the desired specs.
  • high frequency will be meant to indicate at least in the KHz range, more specifically at least 20 KHz and higher to MHz frequencies relevant for EMC specifications; where low frequency will be meant to indicate lower than this lower limit, especially, in the range of 50/60 Hz and lower harmonic multiples, relevant for THD specifications.
  • a L-R High Frequency Low-Pass Filter (HF-LPF) is configured in series with the total circuit load's current-return-path towards the Mains power source.
  • the inductive element (Ll, Fig. 6) is located in series with the total DC current return circuit, and the resistance element (Rl, Fig. 6), that does double-duty as a safety current-limiter in case of a short-circuit inside the whole CFL assembly, is complementarity located in series with the total AC input current path into the lamp.
  • the inductor is implemented as a HF-choke made of a copper-wire coil wounded around a ferrite core, and the resistor is a low- value, high-power one. All and each element's current-carrying capacity of the L-R filter must be dimensioned according to the rated output (20-1; 20-2) maximum brightness required for each CFL, taking in consideration, as well, the extra dissipation required to deal effectively with the onset of spurious higher power-terms of significant value, specially when dimming.
  • a DC electrolytic capacitor is added in parallel with the high power factor switching arrangement, see figure 10 capacitor C3.
  • the low frequency ripple generated by the high power factor switching topology is introduced to the DC supply rail and hence forth amplified by the two switching transistors at high frequency generating harmonic and electromagnetic interference.
  • This subsequent low frequency interference would on its own not pose substantial difficulty, but is amplified by the high frequency switching transistors, possibly creating EMC incompatibility on to the mains Voltage return line.
  • This effect also manifests itself as heat, generated in inductor Ll acting as a choke and having to deal with the subsequent harmonic distortion now apparent in the circuit, making this design less desirable and more energy hungry. It now has been surprisingly found that in order to counter the effects hereof, an electrolytic capacitor can be added as a clamp to minimise the effect of the ripple being generated by the high power factor topology.
  • This electrolytic capacitor needs to be calibrated as to find a balance between the EMC, THD and overall performance of the device. This configuration is by no means conventional as it seems counterproductive, by making the HPF switch topology less efficient and increasing the THD generated by the device. However, when properly calibrated, the high power factor switching arrangement has been found to properly operate within the desired specs.
  • this capacitor should be of very low value in the order of between 20OnF and 90OnF and appropriate Voltage for its intended application market.
  • a typical value for the power factor in a CFL of power value between 5W and 25W would be between 0,9 and 0,96, after adding the capacitive device correctly calibrated, a typical value would be in the order of 0,85 to 0,9, still qualifying under international standards as a HPF device.
  • the dimming circuit B3 is of a phase-cut off type typically including a TRIAC.
  • these types of dimmers have been (and still are) the de-facto standard for the entry-level household sector, and as good as their advantages are, such as: low-price, ruggedness and compactness, unfortunately those face-value advantages are offset by the poor control of the brightness of any standard, off the shelf (and so rightly labelled) non-dimmable CFLs.
  • a simple resistor (or resistor network) of proper value and rating, placed at the input mains' port of the CFLs can make the performance of any phase- cut dimmer more predictable and repeatable.
  • a practical value and rating is given in Figure 6. Accordingly, preferably, a resistive network A3 is provided coupled in parallel to the DC bridge rectifier input (10-1; 10-2) to interface with a dimming circuit B3.
  • the integrity of the filaments 70 at each end of the florescent tube is a clear indication of the relative life-condition of any CFL.
  • the filaments 70 are necessary to help start the ionization process of the compound heavy-metal and complex gas structures inside the tube's rarefied low-pressure vacuum that finally starts to break its initial high impedance state (due to the initial presence of a high-voltage differential potential) in order for an arc to develop across it length and thus starts the lamp (strike phase).
  • This situation is normally referred to as a CFL's cold start-up.
  • the hard-metal filament's core-base are themselves coated with a chemical substance that favours the emissions of primary-source electrons as to greatly facilitate the reliable but complex series of processes that finally bring the lamp to its strike phase. Therefore their integrity, or otherwise the lack of it, is the weakest link in the tube, and they constitute mainly the initial load when the driving electronics are started as the mains power is initially applied to the lamp: the filaments 70 take an initial substantial stress each time the lamp is powered up.
  • the special chemical coating on the filaments 70 begin to literally peel off due to the normal wear and tear of the inter-collision of atoms and electrons due primarily to the relative big surge start-up and (although at a much lesser rate) the normal arc AC currents (back and forth) from end to end of the tube.
  • the implementation is again, simple, rugged and reliable enough to always guarantee a soft-start from initial power-up and an automatic filaments 70 protection when attempting to re-start an already extinguished lamp at low brightness dimming levels.
  • the inductance of the choke and the start capacitance values defines the resonant frequency-circuit that builds-up the required high voltage necessary to generate the necessary initial burst of arc-current that will start the lamp.
  • the lamp Until the resonance point is not achieved, the lamp will not have a enough high-voltage to start-up; therefore, if for some brief time (while at the same time some current is allowed to pass through both filaments 70) their naturally low cold resistance will steadily increase, automatically pre-heating them and will start to generate source electrons just prior to the initiation of the ignition phase.
  • heating supply current for both filaments 70 is obtained from a transformer configuration built-in within the main ballast coil assembly: two independent small-turn coils 140 are added electrically independent and in parallel with each filament.
  • the filaments 70 will always be provided with their heating current, even in the case the lamp has apparently extinguished (due to over-extension of its useful dimming range, or maybe due to a sudden or progressive drop in ambient temperature), as their internal oscillator still will be operational. This can substantially improve a dimmed CFL's lifetime.
  • the dimmable energy saving lamp preferably comprising a gas tube 160 filament heating circuit.
  • the heating circuit may be provided by small-turn coils that are added electrically independent and in parallel with each filament; arranged in transformer configuration built-in within the main ballast coil assembly.
  • Fig. 6 refers to a detailed block diagram showing practical implementation of the device.
  • Fig. 7 shows, for reference purposes, a conventional layout of a high- frequency, switching-mode power supply arrangement without the power factor corrector functional circuit.
  • the PFC-device of fig. 8 is, similar to the device of Figure 3, implemented as a 2-pin element.
  • Fig. 9 shows a physical arrangement for this scheme with dielectric 102, 103 and metallic foils 104, 105 allowing a compact housing.
  • a clamping capacitor C301 is shown formed by a segmented outer foil 104 coupled to the + terminal, opposite an inner foil 105 and divided by a dielectric 103 to provide indicative values between 200 and 90OnF.
  • non limiting values are: for a 7W CFL lamp: a 0.27uF/400V clamping capacitor; for a 9W lamp: a 0.3uF/400V clamping capacitor; for a HW lamp a 0.3uF/400V capacitor; for a 15W lamp; a 0.47uF/400V clamping capacitor; for a 2OW lamp, a 0.6uF/400V clamping capacitor; and for a 25W lamp; a 0.47uF/400V clamping capacitor
  • Outer foil 104 is further segmented and electrically coupled via diode D201 opposite segmented inner foil 105 that is electrically coupled via diode DlOl and divided by a dielectric 102 to provide two corresponding capacitors C201 and ClOl with indicative capacitive values between 5 and 25 uF/250V.
  • a diode D301 divides dielectric 102 and is coupled in flyback configuration to the diodes D201 and DlOl to form a two-terminal network of three serially switched flyback diodes (DlOl, D201, D301); wherein the first and second diodes (D201, D301) are coupled in parallel with a first polarized capacitor (ClOl) and wherein the second and third diodes (D301, DlOl) are coupled in parallel with a second polarized capacitor (C201).
  • Integrated Capacitor C301 can help with the passing margin of EMC regulations, greatly improving the performance (and minimizing the pitfalls) of current passive HPF designs, without adding any other EMC active nor passive components ("counter-measures") into any CFL PCB design.
  • the HPF device module design helps the CFL run cooler; less spent heat means more efficiency power-transfer conversion ratio and better Lumen/Watt product specification.
  • the present design allows ready configuration of an electrolytic capacitor production machine and is impervious to Electrostatic Discharge (no sensitive active components in circuit).
  • Fig. 10 shows another embodiment in addition to the shown power factor corrector circuit (400) of Fig. 2 wherein a clamping capacitor may be coupled in parallel to the power factor corrector circuit (400). In this manner an enhanced power factor corrector device (500) is provided.
  • the dimmable variety performance is greatly enhanced by the constant heating of their filaments while dimming, as it mainly helps to improve the life-time span of the lamp, and aids in its easy re-strike when the dimmer is brought back-up from its minimum settings.
  • Most designs employ discrete/stand-alone single (or several) dedicated "ring- core" ferrite coils/transformers in series with the main ballast coil current path.
  • a pair of E-cores is applied, allowing a compact housing; a first core element 312 including a main coil winding 150, and a second core element 412 coupled to the first core 312 providing for the secondary windings 401 and 402 in transformer configuration.
  • the secondary windings 401 and 402 are provided as small-turn coils that are added electrically independent and in parallel with each filament; arranged in transformer configuration built-in within the main ballast coil assembly 312; 150.
  • a power factor corrector circuit can be applied in dimming circuits for driving LEDs as well as CFLs (or a combination of both).
  • a clamping capacitor is coupled in parallel therewith as shown in fig. 8.
  • Such PFC- device is implemented in another CFL embodiment as shown in figure 10.
  • Figs. 12 and 13 show the result of an EMC frequency sweep of a CFL before (Fig 12) and after (Fig 13) providing the clamping capacitor.
  • the sweep of measured frequencies ranges from 100 kHz. to 2 MHz.
  • the plots show the amount of energy measured in ⁇ V on the vertical axis in dB plotted against the EMC frequencies on the horizontal axis. Comparison of the plots indicates a decrease in the levels of EMC. In particular in the range of 100 - 400 kHz (scale is 200 kHz. / div.) the decrease is at least 10 dB or more (scale is 10 dB / div.).
  • the elements employed for the power factor corrector device and the power factor corrector circuit comprised therein are all passive elements. Passive elements, such as resistors, capacitors and diodes, do not generate energy or provide power gain, but merely store or dissipate energy. Whereas, active elements, such as current sources, voltage sources and transistors, do generate energy or at least can provide power gain.
  • the electrical impedance of a circuit of passive elements can be expressed as a complex quantity in terms of a Real part and an Imaginary part, wherein the Real part relates to the resistance and the Imaginary part relates to the reactance. When no inductors are present the reactance is primarily capacitive, and hence the impedance has a substantially capacitive character. However, this does not exclude some resistive character as well.
  • the electrical behaviour has a primarily capacitive character.
  • the arrangement of the capacitors and the diodes as flyback diodes has the effect of routing the Current in correspondence with the voltage polarity.
  • the present design has various mechanical/electrical advantages: - integrated concept saves parts, wiring, assembly time and PCB foot-print;
  • the clamping capacitor may be dispensed with.
  • the PFC-circuit comprising 2 capacitors and three diodes can also be arranged from a number of N capacitors and N + 1 diodes, while providing a first direct path along all the diodes in one direction and a second path along all the capacitors in the opposite direction.

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Abstract

L'invention concerne un dispositif de correction de facteur de puissance (500) pour circuit de gradation, comprenant : un circuit de correction de facteur de puissance (400) comprenant au moins un condensateur (C1, C2), à coupler à une sortie de pont redresseur continu basse fréquence (203; 204), le circuit de correction de facteur de puissance (400) comprenant une diode de roue libre (D1, D2, D3) couplée en parallèle au(x) condensateur(s) (C1, C2); et un condensateur d'écrêtage (C3) couplé en parallèle au circuit de correction de facteur de puissance (400) conçu pour écrêter une ondulation haute fréquence d'un dispositif ballast en mode de découpage haute fréquence. L'effet global du réseau est d'étendre autant que possible l'angle autrement strictement limité de courant de conduction prélevé sur la ligne d'alimentation.
PCT/NL2010/050054 2009-06-12 2010-02-05 Dispositif de correction de facteur de puissance pour circuit de gradation Ceased WO2010143944A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
NL2003011 2009-06-12
NL2003011A NL2003011C2 (en) 2009-06-12 2009-06-12 Dimmable energy-saving lamp.
NL2003677A NL2003677C2 (en) 2009-10-20 2009-10-20 Ballast device for a dimming circuit.
NL2003677 2009-10-20
NL1037553 2009-12-14
NL1037553A NL1037553C2 (en) 2009-12-14 2009-12-14 Power factor corrector device for a dimming circuit.

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WO2010143944A1 true WO2010143944A1 (fr) 2010-12-16

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CN103298204A (zh) * 2013-04-22 2013-09-11 厦门通士达照明有限公司 带开路保护的可控硅调光led灯驱动器
AT13438U1 (de) * 2012-04-13 2013-12-15 Tridonic Gmbh & Co Kg Betriebsgerät für ein Leuchtmittel
AT13441U1 (de) * 2011-12-23 2013-12-15 Tridonic Gmbh & Co Kg Betriebsgerät mit leistungsfaktorkorrektur
CN106664770A (zh) * 2014-03-24 2017-05-10 雷迪半导体有限公司 电源转换器电路及其方法
US9673723B2 (en) 2011-04-15 2017-06-06 Milan Mancic Circuit adapted to supply a voltage to an electronic device and uses thereof
WO2018137240A1 (fr) 2017-01-26 2018-08-02 Redisem Ltd. Circuit convertisseur de puissance

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
US9673723B2 (en) 2011-04-15 2017-06-06 Milan Mancic Circuit adapted to supply a voltage to an electronic device and uses thereof
AT13441U1 (de) * 2011-12-23 2013-12-15 Tridonic Gmbh & Co Kg Betriebsgerät mit leistungsfaktorkorrektur
US9247592B2 (en) 2011-12-23 2016-01-26 Tridonic Gmbh & Co Kg Operating device with power factor correction and ripple limitation by change in operation
AT13438U1 (de) * 2012-04-13 2013-12-15 Tridonic Gmbh & Co Kg Betriebsgerät für ein Leuchtmittel
CN103298204A (zh) * 2013-04-22 2013-09-11 厦门通士达照明有限公司 带开路保护的可控硅调光led灯驱动器
CN103298204B (zh) * 2013-04-22 2015-08-12 厦门通士达照明有限公司 带开路保护的可控硅调光led灯驱动器
CN106664770A (zh) * 2014-03-24 2017-05-10 雷迪半导体有限公司 电源转换器电路及其方法
EP3123827A4 (fr) * 2014-03-24 2017-09-27 Redisem Ltd. Circuit convertisseur de courant et son procédé
US10103631B2 (en) 2014-03-24 2018-10-16 Redisem Ltd. Power converter circuit and method thereof
WO2018137240A1 (fr) 2017-01-26 2018-08-02 Redisem Ltd. Circuit convertisseur de puissance
US11309790B2 (en) 2017-01-26 2022-04-19 Redisem Ltd. Power converter circuit

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