EP3777487A1 - Procédé et dispositif de détection d'état de lampe, circuit d'attaque de lampe - Google Patents

Procédé et dispositif de détection d'état de lampe, circuit d'attaque de lampe

Info

Publication number
EP3777487A1
EP3777487A1 EP18918921.0A EP18918921A EP3777487A1 EP 3777487 A1 EP3777487 A1 EP 3777487A1 EP 18918921 A EP18918921 A EP 18918921A EP 3777487 A1 EP3777487 A1 EP 3777487A1
Authority
EP
European Patent Office
Prior art keywords
lamp
driver
status
output voltages
output
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.)
Granted
Application number
EP18918921.0A
Other languages
German (de)
English (en)
Other versions
EP3777487B1 (fr
EP3777487A4 (fr
Inventor
Xinhai Li
Yaofeng LIN
Shuanghong Wang
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.)
Tridonic GmbH and Co KG
Original Assignee
Tridonic GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tridonic GmbH and Co KG filed Critical Tridonic GmbH and Co KG
Publication of EP3777487A1 publication Critical patent/EP3777487A1/fr
Publication of EP3777487A4 publication Critical patent/EP3777487A4/fr
Application granted granted Critical
Publication of EP3777487B1 publication Critical patent/EP3777487B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits

Definitions

  • Embodiments of the present disclosure generally relate to the field of electrical apparatus, and more particularly, to a method and device of detecting a status of a lamp, and a lamp driver.
  • lamp drivers are widely used.
  • a status of the lamp should be detected in some cases.
  • DALI Digital Addressable Lighting Interface
  • film capacitors or electrolytic capacitors may be used at an output side of the lamp driver.
  • the charge time of the film capacitors is short, and the charge time of the electrolytic capacitors is long.
  • low ripple current may be achieved when the electrolytic capacitors are used.
  • the electrolytic capacitors when used at the output side of the lamp driver, the charge time of the electrolytic capacitors is long. Then the status of the lamp may be uncertain. For example, the answer to the query actual level command may be incorrect.
  • embodiments of the present disclosure provide a method and device of detecting a status of a lamp, and a lamp driver.
  • the status of the lamp can be determined according to degrees of variations of output voltages of a driver of the lamp. Therefore, the status of the lamp can be detected accurately no matter what types of capacitors are used at the output side of the driver. Furthermore, no additional hardware or electronic element is needed, thus the cost and space may be saved.
  • a method of detecting a status of a lamp including: determining the status of the lamp according to degrees of variations of output voltages of a driver of the lamp.
  • determining the status of the lamp according to comparative results between the degrees of output voltages of the driver and thresholds corresponding to output currents of the driver.
  • determining the status of the lamp as outputting light when the degree of the output voltages is less than a first threshold and the output current of the driver is greater than or equal to a predetermined current and/or determining the status of the lamp as outputting light when the degree of the output voltages is less than a second threshold and the output current of the driver is less than the predetermined current.
  • the first threshold is greater than the second threshold.
  • the method further includes: determining the status of the lamp as starting up in a first period after the driver is started up.
  • the method further includes: calculating slopes of a curve of the output voltages as the degrees of variations of the output voltage.
  • the output voltages are averaged in each second period.
  • a device of detecting a status of a lamp including: a first determining unit configured to determine the status of the lamp according to degrees of variations of output voltages of a driver of the lamp.
  • the first determining unit determines the status of the lamp according to comparative results between the degrees of output voltages of the driver and thresholds corresponding to output currents of the driver.
  • the first determining unit determines the status of the lamp as outputting light when the degree of the output voltages is less than the threshold corresponding to the output current of the driver.
  • the first determining unit determines the status of the lamp as outputting light when the degree of the output voltages is less than a first threshold and the output current of the driver is greater than or equal to a predetermined current, and/or determines the status of the lamp as outputting light when the degree of the output voltages is less than a second threshold and the output current of the driver is less than the predetermined current.
  • the first threshold is greater than the second threshold.
  • the device further includes: a second determining unit configured to determine the status of the lamp as starting up in a first period after the driver is started up.
  • the device further includes: a calculating unit configured to calculate slopes of a curve of the output voltages as the degrees of variations of the output voltages.
  • the output voltages are averaged in each second period.
  • a lamp driver including: the device according to the second aspect.
  • the status of the lamp can be determined according to degrees of variations of output voltages of a driver of the lamp. Therefore, the status of the lamp can be detected accurately no matter what types of capacitors are used at the output side of the driver. Furthermore, no additional hardware or electronic element is needed, thus the cost and space may be saved.
  • Fig. 1 is a flowchart of a method of detecting a status of a lamp with an embodiment of the present disclosure
  • Fig. 2 is another flowchart of a method of detecting a status of a lamp with an embodiment of the present disclosure
  • Fig. 3 is a diagram of a device of detecting a status of a lamp with an embodiment of the present disclosure
  • Fig. 4 is a schematic diagram of a lamp driver with an embodiment of the present disclosure
  • FIG. 5 is a block diagram of a systematic structure of a lamp driver with an embodiment of the present disclosure.
  • the terms “first” and “second” refer to different elements.
  • the singular forms “a” and “an” are intended to include the plural forms as well, unless the context clearly indicates otherwise.
  • the term “based on” is to be read as “based at least in part on. ”
  • the term “one embodiment” and “an embodiment” are to be read as “at least one embodiment. ”
  • the term “another embodiment” is to be read as “at least one other embodiment. ”
  • Other definitions, explicit and implicit, may be included below.
  • a method of detecting a status of a lamp is provided in a first embodiment.
  • Fig. 1 is a flowchart of a method of detecting a status of a lamp with an embodiment of the present disclosure. As shown in Fig. 1, the method includes:
  • Step 101 determining the status of the lamp according to degrees of variations of output voltages of a driver of the lamp.
  • the lamp may be any type of lamps. Such as a LED lamp.
  • the driver may be any type of lamp drivers.
  • the driver may include a converter configured to provide constant current.
  • the converter may be a switched converter clocked at high frequency, such as a resonant half-bridge converter.
  • the converter may be an isolated converter, such as a flyback converter.
  • the converter may be a non-isolated converter, such as a boost converter, buck converter or buck-boost converter.
  • the status of the lamp is determined according to degrees of variations of output voltages of a driver of the lamp.
  • the status of the lamp may include various states, such as, “starting up” , “outputting light” . Furthermore, when the status of the lamp is “outputting light” , the brightness level may be reported directly.
  • an answer to the query actual level command may be a value between 0 ⁇ 255, which represents an actual level of brightness.
  • the degrees of variations of output voltages may be measured by various parameters.
  • the degrees of variations of output voltages may be measured by slopes of a curve of the output voltages.
  • the status of the lamp may be determined according to comparative results between the degrees of output voltages of the driver and thresholds corresponding to output currents of the driver.
  • the status of the lamp may be determined as outputting light when the degree of the output voltages is less than the threshold corresponding to the output current of the driver.
  • the thresholds may be set corresponding to output currents of the driver. In other words, when the output currents are different, the thresholds used to be compared with output voltages may be different.
  • the threshold used in this period may be a relative large threshold.
  • the threshold used in this period may be a relative small threshold.
  • the status of the lamp may be determined as outputting light when the degree of the output voltages is less than a first threshold and the output current of the driver is greater than or equal to a predetermined current, and/or the status of the lamp may be determined as outputting light when the degree of the output voltages is less than a second threshold and the output current of the driver is less than the predetermined current.
  • the first threshold is greater than the second threshold.
  • the predetermined current, the first threshold and the second threshold may be set according to actual requirements. Such as types of drivers or lamps.
  • the predetermined current may be 20%of a maximal output current
  • the first threshold may be 4%or 5%
  • the second threshold may be 0.8%.
  • the method may further include:
  • Step 102 determining the status of the lamp as starting up in a first period after the driver is started up.
  • the first period may be set according to actual requirements. Such as types of drivers or lamps.
  • the output voltages may be almost unchanged for dozens of milliseconds after the driver is started up.
  • the first period may be 64ms.
  • the detection result of the status of the lamp can be correct in this first period after the driver is started up. Otherwise, the status of the lamp may be determined as outputting light incorrectly due to the almost unchanged output voltages.
  • the method may further include:
  • Step 103 calculating slopes of a curve of the output voltages as the degrees of variations of the output voltages.
  • the output voltages may be averaged in each second period. That is to say the averaged output voltages are used to be compared with the thresholds and calculate the slopes.
  • the second period may be set according to actual requirements.
  • the second period may be 8ms.
  • the output voltages may be averaged in each second period, and a third averaged output voltage V3 may be compared with a first averaged output voltage V1 and a second averaged output voltage V2 respectively.
  • the first averaged output voltage V1 is the averaged output voltage in period 64 ⁇ 72ms after the driver is started up
  • the second averaged output voltage V2 is the averaged output voltage in period 73 ⁇ 80ms after the driver is started up
  • the third averaged output voltage V3 is the averaged output voltage in period 81 ⁇ 88ms after the driver is started up.
  • V3 ⁇ V1* (1+Slope) and V3 ⁇ V2* (1+Slope) the determination of the status of the lamp may be carried out. Therefore, influences of shocks of output voltages may be suppressed.
  • the output voltages and output currents of the driver may be detected with existing circuits and methods.
  • Fig. 2 is another flowchart of a method of detecting a status of a lamp with an embodiment of the present disclosure. As shown in Fig. 2, the method includes:
  • Step 201 determining the status of the lamp as starting up in a first period after the driver is started up;
  • Step 202 calculating slopes of a curve of the output voltages of the driver
  • Step 203 determining whether the slope is less than the threshold corresponding to the output current of the driver. Get back to step 202 when the determining result is “no” , and execute step 204 when the determining result is “yes” ;
  • Step 204 determining the status of the lamp as outputting light.
  • the status of the lamp can be determined according to degrees of variations of output voltages of a driver of the lamp. Therefore, the status of the lamp can be detected accurately no matter what types of capacitors are used at the output side of the driver. Furthermore, no additional hardware or electronic element is needed, thus the cost and space may be saved.
  • a device of device of detecting a status of a lamp is provided in a second embodiment.
  • the device is corresponding to the method described in the first embodiment.
  • Fig. 3 is a diagram of a device of detecting a status of a lamp with an embodiment of the present disclosure.
  • a device 300 of detecting a status of a lamp includes:
  • a first determining unit 301 configured to determine the status of the lamp according to degrees of variations of output voltages of a driver of the lamp.
  • the device 300 may further include:
  • a second determining unit 302 configured to determine the status of the lamp as starting up in a first period after the driver is started up.
  • the device 300 may further include:
  • a calculating unit 303 configured to calculate slopes of a curve of the output voltages as the degrees of variations of the output voltages.
  • functions of the first determining unit 301, second determining unit 302 and calculating unit 303 may be corresponding to the steps of the method in the first embodiment, and shall not be described herein any further.
  • the status of the lamp can be determined according to degrees of variations of output voltages of a driver of the lamp. Therefore, the status of the lamp can be detected accurately no matter what types of capacitors are used at the output side of the driver. Furthermore, no additional hardware or electronic element is needed, thus the cost and space may be saved.
  • a lamp driver is provided in a third embodiment.
  • the lamp driver may be any type of lamp drivers. Such as a LED driver, or other drivers.
  • Fig. 4 is a schematic diagram of a lamp driver with an embodiment of the present disclosure. As shown in Fig. 4, a lamp driver 400 includes:
  • a device 401 of detecting a status of a lamp a device 401 of detecting a status of a lamp
  • a converter 402 configured to provide constant current.
  • the device 401 is identical to the device 300 described in the second embodiment, which shall not be described herein any further.
  • the converter 402 may be a switched converter clocked at high frequency, such as a resonant half-bridge converter.
  • the converter may be an isolated converter, such as a flyback converter.
  • the converter may be a non-isolated converter, such as a boost converter, buck converter or buck-boost converter.
  • the central processing unit 501 may be located on the primary side of the isolated converter.
  • the first determining unit 301 may comprise sensing means to sense the output voltage of a driver of the lamp.
  • the first determining unit 301 may comprise sensing means located on the secondary side of the isolated converter to directly determine the output voltage or sensing means located on the primary side of the isolated converter to indirectly determine the output voltage of a driver of the lamp. Such indirect determination of the output voltage of a driver of the lamp may be performed for instance by an additional winding connected to the power transferring transformer which forms a part of the isolated converter.
  • FIG. 5 is a block diagram of a systematic structure of a lamp driver with an embodiment of the present disclosure.
  • a lamp driver 500 may include a central processing unit 501 and a memory 502, the memory 502 being coupled to the central processing unit 501.
  • the functions of the device of of detecting a status of a lamp may be integrated into the central processing unit 501.
  • the central processing unit 501 may be configured to: determine the status of the lamp according to degrees of variations of output voltages of a driver of the lamp.
  • the lamp driver 500 may further include a converter 503.
  • the lamp driver 500 does not necessarily include all the parts shown in FIG. 5. Also, this figure is illustrative only, and other types of structures may also be used, so as to supplement or replace this structure and achieve a telecommunications function or other functions.
  • the central processing unit 501 is sometimes referred to as a controller or control, and may include a microprocessor or other processor devices and/or logic devices.
  • the central processing unit 501 receives input and controls operations of every components of the electronic apparatus 500.
  • the memory 502 may be, for example, one or more of a buffer memory, a flash memory, a hard drive, a mobile medium, a volatile memory, a nonvolatile memory, or other suitable devices.
  • the central processing unit 501 may execute the program stored in the memory 502, to realize information storage or processing, etc. Functions of other parts are similar to those of the prior art, which shall not be described herein any further.
  • the parts of the electronic apparatus 500 may be realized by specific hardware, firmware, software, or any combination thereof, without departing from the scope of the present disclosure.
  • the status of the lamp can be determined according to degrees of variations of output voltages of a driver of the lamp. Therefore, the status of the lamp can be detected accurately no matter what types of capacitors are used at the output side of the driver. Furthermore, no additional hardware or electronic element is needed, thus the cost and space may be saved.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un procédé et un dispositif de détection de l'état d'une lampe et un circuit d'attaque de lampe. L'état de la lampe peut être déterminé en fonction de degrés de variations de tensions de sortie d'un circuit d'attaque de la lampe (101). Par conséquent, l'état de la lampe peut être détecté avec précision quels que soient les types de condensateurs utilisés au niveau du côté de sortie du circuit d'attaque. En outre, aucun matériel ou élément électronique supplémentaire n'est nécessaire, ce qui permet d'économiser le coût et l'espace.
EP18918921.0A 2018-05-15 2018-05-15 Procédé et dispositif de détection d'état de lampe, circuit d'attaque de lampe Active EP3777487B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/086798 WO2019218129A1 (fr) 2018-05-15 2018-05-15 Procédé et dispositif de détection d'état de lampe, circuit d'attaque de lampe

Publications (3)

Publication Number Publication Date
EP3777487A1 true EP3777487A1 (fr) 2021-02-17
EP3777487A4 EP3777487A4 (fr) 2021-11-17
EP3777487B1 EP3777487B1 (fr) 2024-06-19

Family

ID=68539234

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18918921.0A Active EP3777487B1 (fr) 2018-05-15 2018-05-15 Procédé et dispositif de détection d'état de lampe, circuit d'attaque de lampe

Country Status (3)

Country Link
EP (1) EP3777487B1 (fr)
CN (1) CN112189380B (fr)
WO (1) WO2019218129A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10327586A (ja) * 1997-05-26 1998-12-08 Chichibu Onoda Cement Corp 圧電トランスの制御回路及びその制御方法
DE102005004916B4 (de) * 2005-02-02 2015-06-25 Osram Gmbh Verfahren zum Betreiben einer Hochdruckentladungslampe und Betriebsgerät für eine Hochdruckentladungslampe sowie Beleuchtungseinrichtung
CN1993006A (zh) * 2005-10-24 2007-07-04 国际整流器公司 调光镇流器控制电路
JP4627320B2 (ja) * 2005-11-22 2011-02-09 ローム株式会社 インバータおよびその制御回路、ならびにそれらを用いた発光装置および液晶テレビ
CN201323692Y (zh) * 2008-12-22 2009-10-07 巢湖凯达照明技术有限公司 设有浪涌电流保护装置的大功率电子镇流器
KR20170086687A (ko) * 2012-01-20 2017-07-26 오스람 실바니아 인코포레이티드 Led들 및 전원의 컨디션을 평가하기 위한 기법들
JP5991614B2 (ja) * 2012-07-12 2016-09-14 パナソニックＩｐマネジメント株式会社 発光素子点灯装置およびそれを用いた照明器具
WO2014013452A2 (fr) * 2012-07-19 2014-01-23 Koninklijke Philips N.V. Dispositif d'éclairage à circuit de surveillance
CN103987147B (zh) * 2013-02-08 2016-09-28 东林科技股份有限公司 定功率的发光二极管照明装置及定功率输出的控制方法
EP3130204B1 (fr) * 2014-04-07 2019-12-18 Lumileds Holding B.V. Dispositif d'allumage pour hid lampe

Also Published As

Publication number Publication date
CN112189380B (zh) 2021-09-17
WO2019218129A1 (fr) 2019-11-21
EP3777487B1 (fr) 2024-06-19
CN112189380A (zh) 2021-01-05
EP3777487A4 (fr) 2021-11-17

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