WO2015057774A1 - Appareil d'éclairage à semi-conducteurs utilisé avec des ballasts fluorescents - Google Patents

Appareil d'éclairage à semi-conducteurs utilisé avec des ballasts fluorescents Download PDF

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Publication number
WO2015057774A1
WO2015057774A1 PCT/US2014/060594 US2014060594W WO2015057774A1 WO 2015057774 A1 WO2015057774 A1 WO 2015057774A1 US 2014060594 W US2014060594 W US 2014060594W WO 2015057774 A1 WO2015057774 A1 WO 2015057774A1
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WO
WIPO (PCT)
Prior art keywords
low
coupled
impedance
filament
frequency blocking
Prior art date
Application number
PCT/US2014/060594
Other languages
English (en)
Inventor
Jun Zhang
Original Assignee
Cree, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US14/055,264 external-priority patent/US10104723B2/en
Priority claimed from US14/256,573 external-priority patent/US10045406B2/en
Application filed by Cree, Inc. filed Critical Cree, Inc.
Publication of WO2015057774A1 publication Critical patent/WO2015057774A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present inventive subject matter relates to lighting apparatus and methods and, more particularly, to solid-state lighting apparatus.
  • a solid-state light-emitting device may include, for example, a packaged light emitting device including one or more light emitting diodes (LEDs). These may include inorganic LEDs, which may include semiconductor layers forming p-n junctions, and/or organic LEDs (OLEDs), which may include organic light emission layers.
  • LEDs light emitting diodes
  • OLEDs organic LEDs
  • Solid-state lighting devices are commonly used in lighting fixtures, including task lighting, recessed light fixtures, ceiling mounted troffers and the like. Solid-state lighting panels are also commonly used as backlights for small liquid crystal display (LCD) screens, such as LCD display screens used in portable electronic devices, and for larger displays, such as LCD television displays.
  • LCD liquid crystal display
  • Solid-state lighting devices may be attractive for retrofit/replacement applications, where devices such as LEDs may offer improved energy efficiency, reduced heat generation, extended life and desired performance characteristics, such as certain color and/or color rendering capabilities.
  • LED bulbs are commonly used to replace incandescent bulbs in down lights and other applications to reduce energy consumption and increase time between replacements.
  • LED-based replacements for fluorescent lamps have also been developed, as shown, for example, in U.S. Patent No. 6,936,968, U.S. Patent No. 7,507,001, U.S. Patent No. 8,089,213, U.S. Patent No. 8,358,056 and U.S. Patent Application Publication No. 2008/0266849, which describe various types of LED replacements for use in fluorescent light fixtures.
  • Some embodiments provide a lighting apparatus including a solid-state lighting circuit and first and second ballast connection ports configured to be coupled to a ballast.
  • a first filament-imitating impedance is coupled to the first ballast connection port and a first low-frequency blocking impedance couples the first filament-imitating impedance to a first input terminal of the solid-state lighting circuit.
  • a second filament-imitating impedance is coupled to the second ballast connection port and a second low-frequency blocking impedance couples the second filament-imitating impedance to a second input terminal of the solid-state lighting circuit.
  • a fluorescent replacement lamp may include such an apparatus, wherein the first and second terminals of the first and second ballast connection ports comprise respective pins configured to be connected to a fluorescent lamp connector.
  • the first and second filament-imitating impedances each comprise at least one capacitor.
  • the first and second filament-imitating impedances may be configured to transfer power at a nominal frequency of an output produced by the ballast and to provide impedances at the first and second ballast connection ports that prevent shutdown of the ballast.
  • capacitances provided at the respective first and second ballast connection ports may be in a range from about 0.1 ⁇ to about 4 ⁇ .
  • Each of the first and second filament-imitating impedances may further include at least one resistor coupled in parallel with the at least one capacitor thereof.
  • each of the first and second low-frequency blocking impedances may be configured to block a DC offset.
  • each of the first and second low-frequency blocking impedances may be configured to block a nominally 60Hz frequency component.
  • Each of the first and second low-frequency blocking impedances may include at least one capacitor.
  • the apparatus may further include respective resistors coupled in parallel with the at least one capacitors of the first and second low- frequency blocking impedances.
  • the solid-state lighting circuit may include a rectifier circuit having an input port coupled to the first and second low-frequency blocking impedances and at least one light emitting diode (LED) coupled to an output port of the rectifier circuit.
  • the solid-state lighting circuit may further include a matching circuit.
  • the matching circuit may include at least one capacitor coupled in parallel with the output port of the rectifier circuit and at least one inductor coupled between the at least one capacitor and the at least one LED.
  • the at least one LED may include at least one LED string.
  • a lighting apparatus including a solid-state lighting circuit, at least one ballast connection port and at least one low-frequency blocking impedance coupling the at least one ballast connection port to the solid-state lighting circuit.
  • the at least one low-frequency blocking impedance may be configured to block a DC offset.
  • the at least one low-frequency blocking impedance may be configured to block a nominally 60 Hz frequency component.
  • the at least one low-frequency blocking impedance may include at least one capacitor.
  • the apparatus may further include at least one resistor coupled in parallel with the at least one capacitor.
  • the apparatus may further include a filament-imitating impedance coupling the at least one ballast connection port to the at least one low-frequency blocking circuit.
  • the solid-state lighting circuit may include a rectifier circuit having an input port coupled to the at least one low-frequency blocking impedance and at least one LED coupled to an output port of the rectifier circuit.
  • the solid-state lighting circuit may further include a matching circuit.
  • the matching circuit may include at least one capacitor coupled in parallel with the output port of the rectifier circuit and at least one inductor coupled between the at least one capacitor and the at least one LED.
  • the at least one ballast connection port may include a first ballast connection port and a second ballast connection port and the at least one low- frequency blocking impedance may include a first low-frequency blocking impedance coupling the first ballast connection port to a first terminal of the solid-state lighting circuit and a second low-frequency blocking impedance coupling the second ballast connection port to a second input terminal of the solid-state lighting circuit.
  • Each of the first and second low- frequency blocking impedances may be configured to block a DC offset.
  • each of the first and second low-frequency blocking impedances may be configured to block a nominally 60Hz frequency component.
  • Each of the first and second low-frequency blocking impedances may include at least one capacitor.
  • the apparatus may further include respective resistors coupled in parallel with the at least one capacitors of the first and second low-frequency blocking impedances.
  • Figure 1 is a schematic diagram illustrating lighting apparatus with a filament- imitating impedance according to some embodiments
  • Figure 2 is a schematic diagram illustrating lighting apparatus using a capacitor as a filament-imitating impedance according to some embodiments
  • Figures 3-6 are schematic diagrams illustrating lighting apparatus with various filament-imitating impedance configurations according to some embodiments
  • Figure 7 is a schematic diagram illustrating lighting apparatus with a filament- imitating impedance including a parallel combination of a capacitor and resistance according to some embodiments;
  • Figures 8-10 are schematic diagrams illustrating lighting apparatus with a filament-imitating impedance and blocking impedance according to various embodiments
  • Figure 11 is a schematic diagram illustrating lighting apparatus with a rectifier circuit and matching circuit according to some embodiments.
  • Figure 12 is a schematic diagram illustrating lighting apparatus with a CL resonant matching circuit according to some embodiments.
  • Figure 13 is a schematic diagram illustrating lighting apparatus with a CL resonant matching circuit according to further embodiments.
  • Figure 14 is a schematic diagram illustrating a temperature-varying filament- imitating impedance according to some embodiments.
  • Figure 15 and 16 are schematic diagrams illustrating lighting apparatus using temperature-varying filament-imitating impedances according to some embodiments;
  • Figure 17 illustrates a fluorescent tube replacement lamp according to further embodiments;
  • Figures 18 A-B are schematic diagrams illustrating a lighting apparatus according to further embodiments.
  • FIG. 1 illustrates a lighting apparatus 100 according to some embodiments.
  • the apparatus includes at least one ballast connection port 101 including first and second terminals 101a, 101b.
  • the terminals 101a, 101b may comprise, for example, pins that are configured to be connected to a fluorescent lamp connector (e.g., a tombstone connector) that provides electrical coupling to a fluorescent lighting ballast.
  • the apparatus 100 may also include a second port 102 with similar terminals 102a, 102b for use in, for example, bi-pin fluorescent tube replacement applications.
  • a filament-imitating impedance 120 is coupled between the first and second terminals 101a, 101b.
  • a solid-state lighting circuit here shown as LED lighting circuit 110 (which may include one or more LEDs and associated circuitry for driving the same), is coupled to the filament-imitating impedance 120 and the second terminal 101b.
  • the LED lighting circuit 110 may also be coupled to the terminals 102a, 102b of the second ballast connection port 102, either directly or via intervening circuitry.
  • the filament-imitating impedance 120 is configured to provide an impedance that mimics behavior of the filament of a fluorescent lamp.
  • the filament-imitating impedance may be configured to present an impedance between the first and second terminals of a ballast connection port that mimics the impedance provided by a filament of a fluorescent lamp, while at the same time allowing power transfer between the ballast connection port 101 and the LED lighting circuit 110 so that the one or more LEDs of the LED lighting circuit 110 may be driven by the ballast.
  • some fluorescent lighting ballasts may be configured to detect the state of an attached lamp by monitoring the AC and/or DC impedance between terminals of pins connected to the ends of the filament, and may shut down the ballast if the impedance indicates a failed/failing lamp.
  • the filament-imitating impedance may mimic the impedance of a healthy filament under such monitoring and, therefore, may prevent unwanted shutdown.
  • the LED lighting circuit 110 may be configured to provide a matching impedance between the first and second ballast connection ports 101, 102 that facilitates power transfer between the ballast and the LED lighting circuit 110.
  • a filament-imitating impedance may take the form of a capacitor CI coupled to the first and second terminals 101a, 101b of the first ballast port 101 and to a LED lighting circuit 110.
  • the capacitor CI may be sized such that it presents a relatively low impedance above a certain frequency corresponding to the nominal output frequency of the ballast while still providing an impedance sufficient to imitate the filament impedance of a fluorescent lamp and, thus, prevent shutdown due to failure of a filament test by the ballast.
  • the LED lighting circuit 110 may present an impedance that approximately matches an output impedance of the ballast at the ballast's nominal frequency such that power transfer to the LED lighting circuit 110 may be optimized.
  • the capacitor CI may provide a capacitance between the first and second terminals 101a, 101b of the ballast connection port 101 that is in a range from about 0.1 ⁇ to about 4 ⁇ .
  • FIG. 3 illustrates a lighting apparatus 300 including a first filament-imitating impedance 320a coupled between a first and second terminals 101a, 101b of a first ballast connection port 101 and a second filament-imitating impedance coupled between first and second terminals 102a, 102b of a second ballast connection port 102.
  • a lighting apparatus 400 may use such an arrangement implemented using first and second capacitors CI, C2.
  • a lighting apparatus 500 may include respective filament-imitating impedances 520a, 520b, 520c, 520d coupled to respective terminals 101a, 101b, 102a, 102b of first and second ballast connection ports 101, 102.
  • such an arrangement may be implemented using respective capacitors CI, C2, C3, C4.
  • these arrangements may provide capacitances between the first and second terminals 101a, 101b of the first ballast connection port 101 and between the first and second terminals 102a, 102b of the second ballast connection port 102 that are in a range from about 0.1 ⁇ to about 4 ⁇ .
  • the LED lighting circuit 110 may provide a matching impedance between the first and second ballast connection ports 101, 102 as described above.
  • a lighting apparatus 700 may include a filament-imitating impedance 720 that includes a capacitor CI and a resistor Rl connected in parallel with the capacitor CI .
  • Some fluorescent lamp ballasts are configured to detect a DC resistance between pins connected to ends of a filament, and may prevent operation of the lamp if the DC resistance is too great.
  • the resistor Rl may provide sufficient continuity between the terminals 101a, 101b to prevent such a shutdown.
  • the resistor Rl may have a resistance operative to limit current through an attached starter circuit (not shown) to inhibit starter operation, i.e., the resistor Rl may provide a resistance sufficient to reduce or prevent glow discharge in the starter such that a bimetallic switch in the starter remains open.
  • Appropriate resistor values for T8 replacement applications may be in a range from about lk ohms to about 50k ohms.
  • FIG. 8 illustrates a lighting apparatus 800 according to some embodiments of the inventive subject matter.
  • a filament-imitating impedance 820 is coupled to a first terminal 101a of a first ballast connection port 101.
  • a low-frequency blocking impedance 830 is coupled between the second terminal 101b of the first port 101 and an LED lighting circuit 110.
  • the filament-imitating impedance 820 is configured to present an impedance to the ballast that has characteristics similar to those provided by a filament of a fluorescent lamp and may take the form, for example, of the filament-imitating impedances described above with reference to Figures 1-7.
  • the blocking impedance 830 is configured to blocks a lower frequency component that may be provided by the ballast, such as a DC offset produced by the ballast.
  • the apparatus 800 may be configured for operation only with high-frequency electronic ballasts, and the blocking impedance 830 may be configured to block a 60Hz component so that, if the apparatus 800 is incorrectly connected to a magnetic ballast, transfer of power to the LED lighting circuit 110 may be reduced or prevented, thus preventing damage and/or improper operation.
  • the arrangement of the filament-imitating impedance 820 and the blocking impedance 830 may facilitate installation without concern about the orientation of the lamp with respect to the lamp connectors.
  • a typical fluorescent tube is symmetrical, i.e., the two pins on the end of the tube are interchangeable in function.
  • one of the pins will be connected to the ballast, while the other of the pins will be connected to a starter circuit. Installation of a replacement lamp along the lines of Figure 8 in such a fixture may result in the first terminal 101a being connected to the ballast and the second terminal 101b being connected to the starter, such that the filament-imitating impedance 820 may also provide a low-frequency blocking function.
  • FIG. 9 illustrates an exemplary lighting apparatus 900, in which filament- imitating and blocking impedances are provided by respective capacitors CI, C2.
  • a lighting apparatus 1000 may include a filament-imitating impedance 1020 including a capacitor CI and a low-frequency blocking impedance 1030 including a capacitor C2 as described above.
  • the filament-imitating impedance 1020 may also include a resistor Rl coupled in parallel with the capacitor C 1.
  • Some fluorescent lamp ballasts are configured to detect a DC resistance between pins connected to ends of a filament, and may prevent operation of the lamp if the DC resistance is too great.
  • the resistor Rl may provide sufficient continuity between the terminals 101a, 101b to prevent such a shutdown.
  • the resistor Rl may be sized to limit current through an attached starter circuit (not shown in Figure 2) to inhibit starter operation as described above.
  • an additional resistor R2 may be connected in parallel with the blocking capacitor C2.
  • the resistor R2 may be configured to discharge a DC voltage that may develop across the blocking capacitor C2 when the apparatus is used with certain types of electronic ballasts.
  • Figure 11 illustrates a lighting apparatus 1100 according to further
  • the apparatus 1100 includes a first filament-imitating impedance 1120a that includes a resistor Rl and a capacitor CI as described above coupled to a first ballast connection port 101, and a similar second filament-imitating impedance 1120b including a resistor R3 and capacitor C3 coupled to a second ballast connection port 102.
  • a blocking capacitor C2 and associated resistor R2 couples the first filament-imitating impedance 1120a to an input port of a rectifier circuit 1112.
  • a resonant matching circuit 1114 may couple an output port of the rectifier circuit 1112 to one or more LED(s) 1116.
  • the resonant matching circuit 1114 may be configured to provide an impedance between the connection ports 101, 102 that enables an optimal or near optimal power transfer to the one or more LED(s) 1116.
  • the rectifier circuit may comprise a diode bridge circuit 1212
  • the matching circuit may comprise a CL resonant circuit 1214 including a capacitor Cf and inductor Lf
  • the one or more LED(s) may comprise one or more LED strings 1216.
  • a lighting apparatus may include filament-imitating impedances 1320a, 1320b, 1320c, 1320d in the form of parallel combinations of capacitors CI, C2, C3, C4 and resistors Rl, R2, R3, R4 coupled between respective ones of the terminals 101a, 101b, 102a, 102b of first and second connection ports 101, 102 and a rectifier circuit 1212. This arrangement may eliminate the need for a separate blocking impedance.
  • a filament-imitating impedance may be a temperature-varying impedance.
  • Some ballasts perform filament tests in which a filament is tested by measuring a "cold" impedance of the filament before energizing, and then testing the filament impedance after the filament has been energized and heated up. If the change in impedance between the two temperatures fails to meet a predetermined criteria, the ballast may prevent operation.
  • Figure 14 illustrates a filament-imitating impedance 1400 including a capacitor CI and resistor Rl along the lines described above, along with a parallel combination of an additional resistor R2 and a positive temperature coefficient (PTC) resistor Ul coupled in series with the capacitor CI.
  • the PTC resistor Ul has a resistance that increases as current flows through the PTC resistor Ul and heats it up. Such an arrangement can be used to accommodate such a test and prevent shutdown due to failing the test.
  • Figure 15 illustrates use of such a filament-imitating impedance in a lighting apparatus 1500 that includes a rectifier circuit 1211, matching circuit 1214 and LED string(s) 1216 along the lines discussed above with reference to Figure 12.
  • a first filament-imitating impedance 1520a includes a capacitor CI, resistors Rl, R2 and a PTC resistor Ul, and is coupled to a first terminal of an input port of the rectifier circuit 1212 by a blocking circuit 1530 including a capacitor CI and a resistor R5.
  • a second filament-imitating impedance 1520b includes a capacitor C2, resistors R3, R4 and a PTC resistor U2 and is coupled to a second terminal of the input port of the rectifier circuit 1212.
  • Figure 16 illustrates another use of a temperature- varying filament-imitating impedance in a lighting apparatus 1600 that includes a rectifier circuit 1212, matching circuit 1214 and LED string(s) 1216 along the lines discussed above with reference to Figure 13.
  • a first filament-imitating impedance 1620a includes capacitors CI, C3, resistors Rl, R2, R5 and PTC resistor Ul, and a second filament-imitating impedance 1720b includes capacitors C2, C4, resistors R3, R4, R6 and a PTC resistor U2, coupled to respective terminals of an input port of the rectifier circuit 1212.
  • FIG. 17 illustrates a fluorescent tube replacement lamp 1700 according to some embodiments.
  • the lamp 1700 includes a tubular housing 1710 including a translucent portion 1710a and end caps 1720.
  • the lamp 1700 includes first and second ballast connection ports 1701, 1702 at respective ends of the housing 1710.
  • the first ballast connection port 1710 includes pins 1701a, 1701b and the second ballast connection port 1702 includes pins 1702a, 1701b.
  • LEDs 1740 of an LED string may be mounted on a substrate 1730 positioned within the housing 1710.
  • Coupling circuitry 1750 may be supported by the substrate and connect the LEDs 1740 to the port pins 1710a, 1701b, 1702a, 1702b.
  • the coupling circuitry 1750 may include one or more filament- imitating impedances, a low-frequency blocking impedance, a rectifier circuit and a resonant matching circuit as described above.
  • lamps according to some embodiments of the inventive subject matter may take any of a variety of other forms than the tube type lamp shown in Figure 17.
  • some embodiments may be configured to for use in fixtures that utilize circular (e.g., T9) lamps or non-integrated compact fluorescent lamps.
  • FIGS 18A-B illustrate a lighting apparatus 1800 according to further embodiments.
  • the apparatus 1800 includes a rectifier circuit 1812, a matching circuit 1814, first and second filament-imitating impedances 1820a, 1820b, and first and second blocking impedances 1830a, 1830b.
  • the rectifier circuit 1812 is a diode bridge including diodes Dl- D8.
  • the diode bridge is configured to provide redundancy by including respective serially- connected diode pairs D1/D5, D2/D7, D4/D8, D3/D6 in each branch of the diode bridge. Thus, if one of the diodes in a given branch fails in a shorted condition, the bridge may still operate in an acceptable manner.
  • the first filament-imitating impedance 1820a includes capacitors C4, C5 and resistors R3, R4.
  • the second filament-imitating impedance 1820b includes capacitors CI, C2 and resistors Rl, R2. These circuits are also configured to provide component redundancy by using serially-connected components in each of the circuit branches. For example, if the capacitor C4 shorts, the capacitor C5 may still provide a suitable filament-impedance imitating function to maintain acceptable operation of the apparatus 1800.
  • the first filament-imitating impedance 1820a is coupled to a first terminal of an input port of the rectifier circuit 1812 by the first blocking impedance 1830a, which includes a capacitor C7 and a resistor R5.
  • the second filament-imitating impedance 1820b includes capacitors CI, C2 and resistors Rl, R2 and is coupled to a second terminal of the input port of the rectifier circuit 1812 by the second blocking impedance 1830b, which includes a capacitor CI 3 and a resistor R6.
  • the first and second blocking impedances 1830a, 1830b also provide redundancy, e.g., if one of the capacitors C7, C13 fails, low-frequency blocking may still be provided by the other capacitor.
  • the first and second blocking impedances 1830a, 1830b may be configured to block a lower frequency component that may be provided by the ballast, such as a DC offset produced by the ballast.
  • the apparatus 1800 may be configured for operation only with high-frequency electronic ballasts, with the blocking impedances 1830a, 1830b configured to block a nominal 60Hz (or other fundamental) component so that, if the apparatus 1800 is incorrectly connected to a magnetic ballast, transfer of power to the rectifier 1812 may be reduced or prevented, thus preventing damage and/or improper operation.
  • the matching circuit 1814 includes capacitors C2, C6, C8, C2 and inductor LI, and is configured to be coupled to at least one LED, here an LED string including first and second serially-connected segments 1816a, 1816b.
  • the capacitors C2, C6, C8, C2 are configured to provide serial redundancy, so the matching circuit 1814 may continue to operate in an acceptable manner if one the capacitors C2, C6, C8, C2 shorts out.
  • a resistor R26 may be coupled in series with the inductor LI .
  • the value of the resistor R26 may be varied (e.g., by using a variable resistor and/or a component slot in which selected resistor or conductive jumper may be installed during manufacture and/or field installation) to adjust performance of the matching circuit, i.e., the resistor R26 may be selected to tailor the driver circuitry to various different ballasts.
  • Capacitors CIO, Cll may be connected across the output of the matching circuit 1814, and may provide additional smoothing of the output provided to the LED segments 1816a, 1816b.
  • Resistors R13, R24 may be coupled in parallel with respective ones of the capacitors CI 0, CI 1 , and may be used to discharge the capacitors CI 0, CI 1 when power to the apparatus 1800 is removed, thus enabling a crisper turnoff of the LED segments 1816a, 1816b.
  • a resistor R25 may be coupled in series with the LED segments 1816a, 1816b.
  • the value of the resistors R25 may be adjusted (e.g., in a manner similar to that described above for the resistor R26) to adjust a load presented to the driver circuitry.
  • the resistor R25 may be varied to allow use of the driver circuitry with different LED loads.
  • each of the LED segments 1816a, 1816b includes three parallel connected strings of LEDs, but it will be appreciated that other string arrangements may be used.
  • Each of the strings of LEDs may include LEDs having substantially the same spectral output or a combination of LEDs having different spectral outputs that may be combined to produce a desired aggregate spectral output.
  • the apparatus 1800 may be included in a fluorescent tube replacement lamp along the lines illustrated in Figure 17.

Abstract

L'invention concerne un appareil d'éclairage comprenant un circuit d'éclairage à semi-conducteurs, au moins un orifice de raccordement de ballast et au moins une impédance de blocage basse fréquence couplant ledit au moins un orifice de raccordement de ballast au circuit d'éclairage à semi-conducteurs. Dans certains modes de réalisation, au moins une impédance de blocage basse fréquence peut être configurée pour bloquer un décalage CC. Dans des modes de réalisation supplémentaires, ladite au moins une impédance de blocage basse fréquence peut être configurée pour bloquer une composante de fréquence théoriquement de 60 Hz. Ledit au moins un orifice de raccordement de ballast peut inclure un premier orifice de raccordement de ballast et un second orifice de raccordement de ballast et ladite au moins une impédance de blocage basse fréquence peut inclure une première impédance de blocage basse fréquence couplant le premier orifice de raccordement de ballast à une première borne du circuit d'éclairage à semi-conducteurs et une seconde impédance de blocage basse fréquence couplant le second orifice de raccordement de ballast à une seconde borne d'entrée du circuit d'éclairage à semi-conducteurs.
PCT/US2014/060594 2013-10-16 2014-10-15 Appareil d'éclairage à semi-conducteurs utilisé avec des ballasts fluorescents WO2015057774A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US14/055,264 US10104723B2 (en) 2013-01-24 2013-10-16 Solid-state lighting apparatus with filament imitation for use with florescent ballasts
US14/055,264 2013-10-16
US14/256,573 US10045406B2 (en) 2013-01-24 2014-04-18 Solid-state lighting apparatus for use with fluorescent ballasts
US14/256,573 2014-04-18

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WO2015057774A1 true WO2015057774A1 (fr) 2015-04-23

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