EP3376829B1 - Led lamp arrangement for replacing a fluorescent lamp - Google Patents

Led lamp arrangement for replacing a fluorescent lamp Download PDF

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Publication number
EP3376829B1
EP3376829B1 EP18152634.4A EP18152634A EP3376829B1 EP 3376829 B1 EP3376829 B1 EP 3376829B1 EP 18152634 A EP18152634 A EP 18152634A EP 3376829 B1 EP3376829 B1 EP 3376829B1
Authority
EP
European Patent Office
Prior art keywords
ballast
led lamp
circuit
lamp arrangement
leds
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP18152634.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3376829A1 (en
Inventor
Shounak ROY
Gaetano Navaro NAHAR
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Silicon Hill BV
Original Assignee
Silicon Hill BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Silicon Hill BV filed Critical Silicon Hill BV
Priority to PL18152634T priority Critical patent/PL3376829T3/pl
Priority to SI201830188T priority patent/SI3376829T1/sl
Priority to CN201880025225.9A priority patent/CN110547046B/zh
Priority to PCT/EP2018/056236 priority patent/WO2018167058A1/en
Publication of EP3376829A1 publication Critical patent/EP3376829A1/en
Application granted granted Critical
Publication of EP3376829B1 publication Critical patent/EP3376829B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix

Definitions

  • the invention relates to an LED lamp arrangement (e.g. a retrofit LED lamp) for replacing a fluorescent lamp suitable to be energized by a ballast, which can be either a magnet ballast or an electronic ballast.
  • a ballast which can be either a magnet ballast or an electronic ballast.
  • Fluorescent lighting has been around for many years now. This form of lighting started out as a highly efficient alternative for incandescent light bulbs, but has recently been surpassed by LED lighting in terms of efficiency and power consumption, and also in other aspects as set out below.
  • Fluorescent lamps generally comprise a tube filled with an inert gas and a small amount of mercury, capped at both ends with double pinned end caps.
  • the end caps contain a glow wire to preheat the gasses inside the tube and to vaporize the mercury in order to assist with ignition of the fluorescent lamp.
  • a main switch e.g. a wall switch or a cord switch on the ceiling
  • the fluorescent lamp is ignited, and heat generated by the conducted current keeps the fluorescent lamp in operational condition.
  • a ballast is connected between the mains power supply and the fluorescent lamp and power is supplied to the lamp via the ballast.
  • ballasts When first introduced, the only available ballasts were simple inductive or reactive elements placed in series with the power supply to the fluorescent lamp, which limit consumed power by limiting the AC current as a result of the frequency dependent impedance of the inductor. An undesirable result is a relatively low power factor and relatively high reactive power. These types of ballasts are usually referred to as magnetic ballasts.
  • ballasts More recently other types have been introduced, such as electronic ballasts. These ballasts usually first convert AC mains power into DC power, and subsequently convert the DC power into high frequency AC power to drive the fluorescent lamp.
  • LED lamps are more efficient than fluorescent lamps. Besides, they have many other advantages. For example, no mercury is required for LED lamps, LED lamps are more directional, LEDs require less effort to control or regulate power consumed, and the lifetime is increased over fluorescent lamps. Thus, replacing fluorescent lamps with LED lamps in an existing luminaire is often desirable.
  • US Patent No. 9,441,795 discloses a retrofit LED-lamp using LED circuitry connected between the outputs of a rectifier circuit.
  • the LED circuitry comprises strings of LEDs.
  • the ballast is a magnet ballast
  • the LED circuitry is switched in a configuration in which the strings of LEDs are connected in series.
  • the ballast is an electronic ballast
  • the LED circuitry is switched in a configuration in which the strings of LEDs are connected in parallel.
  • the type of ballast is detected by sensing frequency of the AC current supplied by de ballast. A lower frequency indicates that the ballast is a magnet ballast, and a higher frequency indicates that the ballast is an electronic ballast.
  • the retrofit lamp On some commercial available electronic ballasts the retrofit lamp the output voltage of the ballast peaks in a type of burst mode during a few seconds after the lamp is switched off, resulting in the lamp generating visible light flashes. These light flashes are disturbing to the users.
  • the invention relates to an LED lamp arrangement according to claim 1.
  • the LED lamp arrangement is suitable for replacing a fluorescent lamp suitable to be energized by a ballast, e.g. the LED lamp arrangement is suitable for replacing a fluorescent lamp in a luminaire having such a ballast.
  • the ballast can be a magnet ballast operating at a first frequency or an electronic ballast operating at a second frequency, higher than the first frequency.
  • a typical operating frequency of a magnet ballast (first frequency) may be for example 50 Hz
  • a typical operating frequency of an electronic ballast (second frequency) may be for example 40 kHz.
  • the LED lamp arrangement according to the invention may also be suitable for replacing a fluorescent lamp when the electronic ballast has an operation mode in which the electronic ballast generates a series of bursts and outputs the series of bursts to the LED lamp arrangement.
  • This operation mode may relate to an operation after the lamp is switched off.
  • the luminaire may be controlled by a main switch (e.g. a switch on the wall).
  • the operation mode of the electronic ballast may be a turn-off operation within less than 10 seconds after the main switch is turned off (e.g. by a user).
  • the user can feel free to install the LED lamp arrangement to a luminaire to replace a fluorescent lamp, without having to worry whether the ballast is a magnet ballast or an electronic ballast, and furthermore in the latter case whether the electronic ballast has the (turn-off) operation mode which generates the series of bursts.
  • the LED lamp arrangement comprises a rectifier circuit for rectifying a current drawn from the ballast to generate a rectified current, and an LED circuit connected to receive the rectified current.
  • the LED circuit comprises a plurality of groups of LEDs switchable between at least a first circuit configuration and a second circuit configuration.
  • the first circuit configuration comprises a greater number of groups of LEDs connected in series than the second circuit configuration.
  • Different circuit configurations may have different circuit arrangement of the groups of LEDs in which at least a portion of the groups of LEDs are connected into the circuit differently.
  • the plurality of circuit configurations may differ in the number of groups of LEDs connected in series versus the number of groups of LEDs connected in parallel. This allows the LED circuit to change its circuit configuration suitable for a corresponding ballast.
  • the LED lamp arrangement may be arranged to switch to the first circuit configuration when the ballast is a magnetic ballast, and switch to the second circuit configuration when the ballast is an electronic ballast.
  • the LED lamp arrangement comprises an auxiliary circuit, which defines a conductive path connected in parallel with the plurality of groups of LEDs in the second circuit configuration. This can be achieved by connecting a wiring (e.g. a wire, a metal layer, etc.) across at least one group of the LEDs and other components (such as a capacitor) along the wiring. In this way, when this group of LEDs is connected into a parallel connection with other groups of LEDs in the second circuit configuration, the conductive path will also be connected into a parallel connection with the other groups of the LEDs.
  • a wiring e.g. a wire, a metal layer, etc.
  • the auxiliary circuit comprises a capacitor in the conductive path, wherein the LED lamp arrangement is arranged to bypass the groups of LEDs and charges the capacitor when the LED lamp arrangement receives the series of bursts from the electronic ballast, and to discharge the capacitor during a time interval between the series of bursts.
  • the LEDs are bypassed and the capacitor is charged when a burst arrive, during that period the current is primarily conducted via the parallel conductive path rather than the LEDs.
  • the LEDs do not produce light or barely produces any light so that the user can barely see; as the capacitor is sufficiently discharged (doesn't need to be 100% discharged) during the interval between the bursts, the conductive path will be able to perform the above-mentioned function again when the next burst arrive. In this way, the problem of the light flashes can be avoided.
  • the capacitance of the capacitor should be high enough to avoid quickly approaching a maximum charged state when the burst is received, and should be low enough to be sufficiently discharged during the time intervals.
  • the capacitor has a capacitance in a range of 10 ⁇ F - 50 ⁇ F.
  • the series of bursts may represent a voltage source.
  • the voltage during the time interval between the series of bursts may be less than 1 V RMS .
  • the time interval between the series of bursts may be in a range from 1 millisecond to 300 milliseconds.
  • the time interval between the series of bursts may be substantially a constant.
  • the conduction path (which is connected in parallel with the groups of LEDs) should have a lower impedance than the LEDs.
  • an inductor has a high impedance because its impedance is proportional to the signal frequency.
  • the conduction path via the capacitor (which has a low impedance at the operation frequency of electronic ballasts) should have a low inductance and preferably has no inductance.
  • the conductive path does not comprise an inductive element (e.g. an inductor) connected in series with the capacitor.
  • the auxiliary circuit further comprises a control circuit for controlling an operation of the LED lamp arrangement.
  • a first end of the capacitor may be electrically connected to a voltage supply terminal (e.g. a Vcc terminal) of the control circuit and a second end of the capacitor is connected to a common (e.g. a return connection line connected to the rectifier circuit).
  • the capacitor not only can function to deal with the bursts, but also can function to stabilize the voltage supplied to the control circuit of the LED lamp arrangement.
  • Fig. 1 shows an embodiment of the LED lamp arrangement 1 according to the invention.
  • the LED lamp arrangement 1 is arranged to replace a fluorescent lamp, such as a fluorescent tube.
  • the LED lamp arrangement 1 comprises an LED circuit 8 which comprises a plurality of groups of LEDs 9, 10, 11, 12, 13 which emit light when a current flows through the LEDs.
  • the LED circuit 8 comprises five groups of LEDs 9, 10, 11, 12, 13 via connection diodes.
  • the number of groups may be other than five, e.g. the LED lamp arrangement 1 may comprise two, three, or other number of groups of LEDs, as described in WO 2016/151125 A1 .
  • Each group of LEDs may comprise a plurality of LEDs connected in series or parallel or a combination of both, and it is also possible to have one or more groups comprising a single LED.
  • the LED string comprises plural (e.g.10 - 20) LEDs connected in series.
  • the LED lamp arrangement 1 comprises a rectifier circuit 4, 5.
  • the rectifier circuit may comprise multiple parts. In the embodiment shown, the rectifier circuit comprises two bridge rectifiers. Other types of rectifiers may also be used.
  • the rectifier circuit 4, 5 may be electrically connected to a first connection line 6 and a second connection line 7 which is connected to a common.
  • the current drawn from the ballast received via pin pairs 2-2' and 3-3' of the LED lamp arrangement 1 is rectified by the rectifier circuit 4, 5, and a rectified current is supplied the LED circuit 8 via the first connection line 6 and the second connection line 7.
  • the connection between the groups of LEDs 9, 10, 11, 12, 13 may be switched in a plurality of circuit configurations, including a first circuit configuration and a second configuration, by controlling switches 26 and 27, as described in US 9,441,795 .
  • the first circuit configuration corresponds to a state in which both switches 26 and 27 are open.
  • the groups of LEDs 9, 10, 11, 12, 13 may be connected in series between the first and second connection lines 6, 7.
  • both switches 26 and 27 may be closed.
  • the groups of LEDs 9, 10, 11, 12, 13 may be connected in parallel between the first and second connection lines 6 and 7.
  • the voltage across the LED circuit 8 is represented by the sum of the forward voltages of a greater number of groups of LEDs.
  • the voltage across the LED circuit 8 is represented by the forward voltage across a smaller number of groups of LEDs, e.g. roughly 1/5 of the voltage in the first circuit configuration.
  • the lower voltage is suitable when the LED lamp arrangement 1 is energized by an electronic ballast, whilst the higher voltage is suitable when the LED lamp arrangement is energized by a magnetic ballast.
  • the switches 26 and 27 may be controlled by a signal which indicates whether the ballast is a magnet ballast or an electronic ballast, such that the LED circuit 8 is switch to an appropriate circuit configuration (e.g. the first or second circuit configuration as described above).
  • the signal which controls the switches 26 and 27 are described in US 9,441,795 .
  • the LED lamp arrangement 1 further comprises an auxiliary circuit 31.
  • the auxiliary circuit may comprise a conduction path connected in parallel with at least one group of LEDs 13.
  • the conduction path comprises a capacitor 39.
  • Fig. 2 shows a typical switch-off behavior with bursts occurring in electronic ballasts.
  • the LED lamp arrangement 1 In the time interval t 0 -t 1 , the LED lamp arrangement 1 is in its normal operation, and receives a current from the electronic ballast at a frequency of substantially 40 kHz.
  • the ballast During a few seconds after the lamp is switched off at t 1 , the ballast generates a series of burst voltages and supplies those burst voltages to the LED lamp arrangement.
  • the burst voltage may have the frequency as the operation frequency of the ballast (e.g. substantially 40k), and the interval between burst voltages may be a few milliseconds to a few hundreds of milliseconds.
  • the auxiliary circuit 31 is arranged to discharge the capacitor 39 during the time interval between t 1 and the first burst voltage, and during the time intervals between the burst voltages.
  • the sufficiently discharged capacitor 39 conducts the current and bypasses the LEDs. In this way, as the LEDs do not conduct a current or barely conducts any current, those LEDs do not emit light or merely emit little amount of light that the user can barely see, the flashes caused by the bursts can therefore be avoided.
  • the capacitance of the capacitor 39 is high enough to absorb the burst current, and is low enough to be sufficiently discharged during the relevant time intervals, so that it can absorb the current from the next burst.
  • the capacitor 39 has a capacitance in a range of 10 ⁇ F - 50 ⁇ F.
  • the auxiliary circuit 31 may further comprise a control circuit 36 for controlling at least a part of the operation of the LED lamp arrangement 1.
  • the auxiliary circuitry 31 comprises a control circuit 36, which may be an integrated circuit, for controlling one or both of the switches 26, 27.
  • the voltage supply terminal of the control circuit 36 is connected to the capacitor 39. In this way, as the capacitor 39 is connected in parallel with at least one group of LEDs 13, the forward voltage of LEDs can be used as a voltage source. In this embodiment, the capacitor 39 also function to stabilize the voltage supplied to the control circuit 36.
  • the LED lamp arrangement 1 may comprise an elongated cylindrical housing to form a tube.
  • the pairs of connector pins 2- 2 and 3-3' may be arranged at both ends of the elongated cylindrical housing to connect the LED lamp arrangement 1 to the ballast.
  • the LED lamp arrangement 1 may further comprise an inductive element 28 and a switch 29 connected across the inductive element 28, for controlling the current when a special type of electronic ballasts is detected.
  • This type of electronic ballast is known as constant power ballasts.
  • the operation of the inductive element 28 and switch 29, as well as the detection of a constant power ballast, are described in detail in WO 2016/151125 .
  • the LED lamp arrangement 1 may be arranged to detect whether the current drawn from the ballast exceeds a reference vale, and if so, to open the switch 29. This results in that the current flows through the LED circuit 8 and the inductive element 28 which has a high impedance at the operating frequency of the electronic ballast, thereby limiting the current.
  • the current drawn from the ballast may be estimated using a sensor circuit.
  • the sensor circuit may comprises a resistor 30 as shown in Fig. 1 .
  • the current drawn from the ballast can be estimated by measuring the voltage across the resistor 30.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP18152634.4A 2017-03-13 2018-01-19 Led lamp arrangement for replacing a fluorescent lamp Active EP3376829B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PL18152634T PL3376829T3 (pl) 2017-03-13 2018-01-19 Układ lampy led do zastąpienia lampy fluorescencyjnej
SI201830188T SI3376829T1 (sl) 2017-03-13 2018-01-19 Ureditev led sijalke za nadomestitev fluorescenčne sijalke
CN201880025225.9A CN110547046B (zh) 2017-03-13 2018-03-13 用于替换荧光灯的led灯装置
PCT/EP2018/056236 WO2018167058A1 (en) 2017-03-13 2018-03-13 Led lamp arrangement for replacing a fluorescent lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17160657 2017-03-13

Publications (2)

Publication Number Publication Date
EP3376829A1 EP3376829A1 (en) 2018-09-19
EP3376829B1 true EP3376829B1 (en) 2020-10-21

Family

ID=58267040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18152634.4A Active EP3376829B1 (en) 2017-03-13 2018-01-19 Led lamp arrangement for replacing a fluorescent lamp

Country Status (7)

Country Link
EP (1) EP3376829B1 (pl)
CN (1) CN110547046B (pl)
DK (1) DK3376829T3 (pl)
HU (1) HUE053043T2 (pl)
PL (1) PL3376829T3 (pl)
SI (1) SI3376829T1 (pl)
WO (1) WO2018167058A1 (pl)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9480109B2 (en) * 2014-10-14 2016-10-25 Jiaxing Super Lighting Electric Appliance Co., Lti Power source module for LED lamp
AU2014326915B2 (en) * 2013-09-25 2019-06-13 Silicon Hill B.V. LED lighting system
CN205961494U (zh) * 2014-09-28 2017-02-15 嘉兴山蒲照明电器有限公司 Led直管灯
FI3275289T3 (fi) 2015-03-26 2024-04-02 Silicon Hill Bv LED-valaisujärjestelmä
NL2014525B1 (en) * 2015-03-26 2017-01-06 Silicon Hill Bv Led lighting system.
EP3240367A1 (en) * 2016-04-29 2017-11-01 Silicon Hill B.V. Ballast independent retrofit led lamp with flicker reduction circuitry

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN110547046A (zh) 2019-12-06
HUE053043T2 (hu) 2021-06-28
EP3376829A1 (en) 2018-09-19
CN110547046B (zh) 2022-06-28
DK3376829T3 (da) 2021-01-25
SI3376829T1 (sl) 2021-03-31
WO2018167058A1 (en) 2018-09-20
PL3376829T3 (pl) 2021-04-19

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