EP2405719B1 - LED lighting device and illumination fixture using the same - Google Patents

LED lighting device and illumination fixture using the same Download PDF

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Publication number
EP2405719B1
EP2405719B1 EP11172730.1A EP11172730A EP2405719B1 EP 2405719 B1 EP2405719 B1 EP 2405719B1 EP 11172730 A EP11172730 A EP 11172730A EP 2405719 B1 EP2405719 B1 EP 2405719B1
Authority
EP
European Patent Office
Prior art keywords
voltage
resistance
led lamp
lamp
led
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.)
Not-in-force
Application number
EP11172730.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2405719A1 (en
Inventor
Katunobu Hamamoto
Masafumi Yamamoto
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.)
Panasonic Corp
Original Assignee
Panasonic Corp
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Filing date
Publication date
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of EP2405719A1 publication Critical patent/EP2405719A1/en
Application granted granted Critical
Publication of EP2405719B1 publication Critical patent/EP2405719B1/en
Not-in-force 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • 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
    • H05B45/357—Driver circuits specially adapted for retrofit LED light sources
    • H05B45/3578—Emulating the electrical or functional characteristics of discharge lamps
    • 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
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology

Definitions

  • the present invention relates to an LED lighting device for lighting an LED (a light-emitting diode) and to an illumination fixture using the same.
  • an LED has been increasingly used as a light source for lighting instead of a fluorescent lamp.
  • a light source block configured by mounting many LEDs on a mounting substrate formed in a band plate shape: a glass tube formed to be a straight tube for internally housing the light source block; a base for closing both ends of the glass tube; and a terminal pin for supplying electric power to the light source block, the terminal pin projecting from a side surface of the base.
  • the above-mentioned LED lamp is detachably attached to a lamp socket provided to a dedicated illumination fixture, and is turned on when the electric power (direct-current power) is supplied via the lamp socket from the LED lighting device mounted on the illumination fixture.
  • JP 2006-210271 A describes the LED lighting device as a conventional example.
  • control constant current control to detect a voltage (an output voltage) applied to the LED lamp (a lamp socket) and a current (an output current) flowing in the LED lamp, and to adjust an output voltage so that the output current can coincide with a target value (for example, a rated current of the LED lamp) is carried out.
  • US 2008/284346 A1 shows an LED array driving apparatus capable of controlling dimming of the LED array.
  • a power conversion part is provided to supply a varying output voltage.
  • a current detection part detects an output current supplied from the power conversion part to the LED array.
  • a voltage detection part detects the output voltage applied to the LED array.
  • a control part increases and decreases the output voltage by controlling the power conversion part so that the output current detected by the current detection part can coincide with a target value.
  • a connection judgment part is used to judge whether or not the LED array is connected to power conversion part. The control part completely blocks the output current to the LED array in the case where a judgment result of the connection judgment part shows a disconnection and does not block the output current otherwise.
  • the present invention is achieved in consideration of the above-mentioned problems, and intends to prevent an LED lamp from breaking down by suppressing an electric current flowing when the LED lamp is attached to a lamp socket.
  • An LED lighting device includes: a power conversion part able to vary an output voltage; a current detection part for detecting an output current supplied via a lamp socket from the power conversion part to the LED lamp; a voltage detection part for detecting the output voltage applied via the lamp socket to the LED lamp; a control part for increasing and decreasing the output voltage by controlling the power conversion part so that the output current detected by the current detection part can coincide with a target value; and a connection judgment part for judging whether or not the lamp socket is connected to the LED lamp, wherein the control part limits the output voltage to a predetermined minimum value or less by controlling the power conversion part in the case where a judgment result of the connection judgment part shows no connection and does not limit the output voltage to the predetermined minimum value or less in the case where the judgment result of the connection judgment part shows connection.
  • the LED lighting device further includes: a constant voltage source for applying a constant voltage via the lamp socket; and a detection resistance connected via the lamp socket in parallel to a resistance connected in parallel with a light-emitting diode in the LED lamp, wherein the connection judgment part determines the connection is done when a voltage drop in the detection resistance is less than a predetermined threshold value and determines the connection is not done when the voltage drop is the predetermined threshold value or more.
  • control part limits the output voltage to the minimum value or less by controlling the power conversion part in the case where the output voltage detected by the voltage detection part falls below a predetermined threshold voltage when the judgment result of the connection judgment part shows the connection is done.
  • An illumination fixture comprises: the LED lighting device according to any one of claims 1 to 3; the lamp socket; and a fixture body for holding the LED lighting device and the lamp socket.
  • An LED lighting device and an illumination fixture according to the present invention has an effect of preventing an LED lamp from breaking down by suppressing an electric current flowing when the LED lamp is attached to a lamp socket.
  • Fig. 1 is a circuit block diagram showing the embodiment of an LED lighting device according to the present invention.
  • An LED lamp 110 lighted by the LED lighting device has a similar configuration to the LED lamp described in Patent Document 1.
  • the LED lamp 110 includes a series circuit of many light-emitting diodes 111, a resistance Rx connected in parallel with the series circuit, a glass tube of a straight tube type (refer to Fig. 2 ), and bases (not shown in the drawings) for closing both ends of the glass tube.
  • a pair of terminal pins (not shown in the drawings) connected via a lamp socket 120 to an output terminal of the LED lighting device is provided to the base to be projected.
  • a direct current an output current Io
  • Io an output current
  • the LED lighting device includes an AC/DC converter 1, a power conversion part 2, a current detection part 3, a voltage detection part 4, a control part 5, a connection judgment part 6, and a constant voltage source 7.
  • the AC/DC converter 1 converts an alternating voltage supplied from a commercial alternating power source 100 into a desired direct voltage, and, for example, includes a conventionally-known step-up chopper circuit (a power factor improvement circuit).
  • the power conversion part 2 includes a conventionally-known step-down chopper circuit including: a semiconductor switching element (hereinafter, abbreviated to a switching element) 20 such as a bipolar transistor and a field-effect transistor; an inductor L; a diode D; and a capacitor C2.
  • a semiconductor switching element hereinafter, abbreviated to a switching element 20 such as a bipolar transistor and a field-effect transistor
  • an inductor L such as a bipolar transistor and a field-effect transistor
  • a diode D such as a bipolar transistor and a field-effect transistor
  • C2 capacitor
  • the voltage detection part 4 includes a series circuit of voltage-dividing resistances R1 and R2 connected between the output terminals of the power conversion part 2 (between both ends of the capacitor C2). Then, detected voltages (voltages proportional to an output voltage Vo) divided by the voltage-dividing resistances R1 and R2 are outputted from the voltage detection part 4 to the control part 5.
  • the current detection part 3 includes a detection resistance R3 inserted between the output terminal on a negative voltage side of the power conversion part 2 and a negative electrode side of the lamp socket 120. Then, the voltage stepping-down of the detection resistance R3 due to the output current Io is outputted as the detected voltage from the current detection part 3 to the control part 5.
  • the control part 5 is configured by a controlling integrated circuit or a microcontroller and a memory, and controls the power conversion part 2 so that the output current Io detected by the current detection part 3 can coincide with a target value, thereby increasing and decreasing the output voltage Vo.
  • the control part 5 is configured by the microcontroller and the memory
  • data of a rated current value of the LED lamp 110 is preliminarily stored in the memory.
  • the microcontroller converts the detected voltage received from the current detection part 3 into a magnitude of the output current Io (a current value), and adjusts an on-duty ratio of the switching element 20 so that the current value can coincide with the rated current value (the target value) stored in the memory, thereby increasing and decreasing the output voltage Vo. That is, the control part 5 carries out constant current control to pass a constant current (a rated current) through the LED lamp 110.
  • Vf ⁇ n the forward voltage
  • the control part 5 may carry out the constant current control within at least a range between 35V and 70V so that a plurality of the LED lamps having various rated voltage can be used.
  • the constant voltage source 7 includes: a resistance R4 connected at one end to the output terminal on a higher potential side of the AC/DC converter 1; and a Zener diode 70 connected at the cathode to the other end of the resistance R4 and connected at the anode to a lower potential side of the lamp socket 120. Then, a constant voltage (a Zener voltage Vz) generated between both ends (between the cathode and anode) of the Zener diode 70 is applied via a resistance R5 to the lamp socket 120 and the connection judgment part 6, respectively. Meanwhile, the constant voltage (the Zener voltage) applied from the constant voltage source 7 is required to be lower than the rated voltage of the LED lamp 110.
  • the constant voltage (the Zener voltage) can be set so as to be lower than the rated voltage referring to the LED lamp having a lower rated voltage as a criterion.
  • the constant voltage (the Zener voltage) applied from the constant voltage source 7 has to be a lower voltage than the dangerous voltage.
  • the voltage value of the dangerous voltage slightly varies depending on the specification, but generally is a voltage exceeding 50V in the direct current.
  • the connection judgment part 6 includes: a series circuit of three resistances R5, R6, and R7 connected between the cathode of the Zener diode 70 and the lower potential side of the lamp socket 120; and a comparator 60 for comparing the voltage stepping-down in the resistance (detection resistance) R7 with a threshold voltage Vref. Meanwhile, the connection point of two resistances R5 and R6 is connected to the higher potential side of the lamp socket 120. In a state where the LED lamp 110 is not connected to the lamp socket 120 (an unloaded state), the voltage obtained by dividing the Zener voltage Vz with the resistances R5, R6, and R7 (the voltage stepping-down in the resistance R7) is inputted to a positive terminal of the comparator 60.
  • the resistance Rx of the LED lamp 110 is connected in parallel to two resistances R6 and R7. Accordingly, the voltage stepping-down in the resistance R7 under the loaded state is lower than that under the unloaded state.
  • the threshold voltage Vref inputted to a negative terminal of the comparator 60 is set to be a value between the voltage stepping-down in the resistance R7 under the loaded state and the voltage stepping-down in the resistance R7 under the unloaded state.
  • the output of the comparator 60 becomes an H level under the unloaded state and becomes an L level under the loaded state.
  • the output of the comparator 60 (the judgment result of the connection judgment part 6) is inputted to the control part 5, and in accordance with the output of the comparator 60, the control part 5 makes the power conversion part 2 be operating or non-operating.
  • the AC/DC converter 1 operates to output the direct voltage.
  • the constant voltage the Zener voltage Vz
  • the connection judgment part 6 carries out the judgment, the loaded state or the unloaded state.
  • the control part 5 makes the power conversion part 2 operate to start the constant current control. Meanwhile, in the case where the judgment result of the connection judgment part 6 is the unloaded state, the control part 5 does not make the power conversion part 5 operate.
  • the control part 5 stops the operation of the power conversion part 2 until the connection judgment part 6 judges whether or not the LED lamp 110 is connected. And, since the control part 5 starts the operation of the power conversion part 2 after the connection judgment part 6 judges the connection is done (the loaded state), a voltage equal to or more than the rated voltage is not applied to the LED lamp 110. As the result, the current flowing when the LED lamp 110 is attached to the lamp socket 120 is suppressed, and accordingly the LED lamp 110 can be prevented from breaking down.
  • the LED lamp 110 is detached from the lamp socket 120 under a condition where the power conversion part 2 is operating.
  • the output current Io does not flow; however, the output voltage Vo of the power conversion part 2 is increased because the control part 5 continues the constant current control.
  • the control part 5 cancels the constant current control to stop the power conversion part 2. Accordingly, when the LED lamp 110 is connected to the lamp socket 110 next time, the connection judgment by the connection judgment part 6 is carried out under the state the output of the power conversion part 2 stops as described above.
  • the resistance value of the resistance R5 is set to be relatively small, the current passes the resistance R5 and the Zener diode 70, and thus the voltage applied to the lamp socket 120 can be rapidly decreased.
  • the control part 5 cancels the constant current control to stop the power conversion part 2.
  • the control part 5 stops the operation of the power conversion part 2, and thus the broken LED lamp 110 can be prevented from being continuously used.
  • the control part 5 stops the power conversion part 2 in the unloaded state and in the breaking-down; however, the stopping is not necessarily required.
  • the control part 5 controls the power conversion part 2 to limit the output voltage Vo to be the minimum value sufficiently lower than the rated voltage of the LED lamp 110 or less.
  • the LED lighting device according to the present embodiment lights one LED lamp 10; however, it is needless to say that the plurality of LED lamps 110 connected in series can be lighted at the same time.
  • the connection judgment part 6 judges the loaded state and the unloaded state, and when the judgment result shows the loaded state, the control part 5 may operate the AC/DC converter 1 and the power conversion part 2.
  • the LED lighting device is mounted on the illumination fixture shown in Fig. 2 .
  • the illumination fixture includes: a fixture body 130 directly fixed to a ceiling; and a pair of lamp sockets 120 provided to the fixture body 130.
  • the fixture body 130 is formed in a long angulated cylindrical shape whose side surface shape seen from the longitudinal direction is a trapezoidal shape, and internally houses the LED lighting device. And, the lamp sockets 120 and 120 are arranged on both end parts in the longitudinal direction on a lower surface of the fixture body 130, respectively.
  • the lamp sockets 120 and 120 have the same structure as that of a conventionally-known lamp socket for a straight tube fluorescent lamp.
  • a direct current is supplied from any one of two lamp sockets 120 and 120 to the LED lamp 110, there is a possibility that the direct current is supplied to the filament part when the fluorescent lamp is attached to the lamp sockets 120 and 120 by mistake.
  • an electrode shape of the base of the LED lamp 110 may be formed to be a different shape from that of the fluorescent lamp, and the lamp sockets 120 and 120 may have a structure conforming to the base of the LED lamp 110.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP11172730.1A 2010-07-06 2011-07-05 LED lighting device and illumination fixture using the same Not-in-force EP2405719B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010154130 2010-07-06

Publications (2)

Publication Number Publication Date
EP2405719A1 EP2405719A1 (en) 2012-01-11
EP2405719B1 true EP2405719B1 (en) 2013-09-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11172730.1A Not-in-force EP2405719B1 (en) 2010-07-06 2011-07-05 LED lighting device and illumination fixture using the same

Country Status (2)

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EP (1) EP2405719B1 (ja)
JP (3) JP5828104B2 (ja)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5955061B2 (ja) * 2012-04-04 2016-07-20 シャープ株式会社 電源装置及び照明装置
JP6025371B2 (ja) * 2012-04-11 2016-11-16 三菱電機株式会社 電源装置及び照明器具
JP6127402B2 (ja) * 2012-07-24 2017-05-17 三菱電機株式会社 点灯装置及びこの点灯装置を備える照明器具
KR20140059652A (ko) * 2012-11-08 2014-05-16 삼성전기주식회사 전원 공급 장치 및 조명용 전원 공급 장치
JP6118431B2 (ja) * 2013-08-27 2017-04-19 フィリップス ライティング ホールディング ビー ヴィ 能動型過電流保護回路を有するｌｅｄレトロフィットランプ
JP2016025076A (ja) * 2014-07-25 2016-02-08 三菱電機株式会社 点灯装置
JP6821440B2 (ja) * 2017-01-06 2021-01-27 東芝ライテック株式会社 電源装置及びこの電源装置を備えた照明装置
JP2018113733A (ja) * 2017-01-06 2018-07-19 東芝ライテック株式会社 電源装置及びこの電源装置を備えた照明装置
JP7153873B2 (ja) * 2018-11-15 2022-10-17 パナソニックＩｐマネジメント株式会社 点灯装置、照明装置、及び非常用照明システム
JP7278171B2 (ja) * 2019-08-08 2023-05-19 シーシーエス株式会社 Ｌｅｄ玉切れ検知機構及びこれを用いたｌｅｄ光照射システム

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JP4169008B2 (ja) * 2005-01-31 2008-10-22 松下電工株式会社 Ｌｅｄ駆動装置、及びそれを用いた照明装置
US7391335B2 (en) * 2005-08-18 2008-06-24 Honeywell International, Inc. Aerospace light-emitting diode (LED)-based lights life and operation monitor compensator
US7911149B2 (en) * 2007-02-19 2011-03-22 Marlex Engineering Inc. Impedance controlled electronic lamp circuit
JP5142620B2 (ja) 2007-08-06 2013-02-13 シャープ株式会社 照明装置
KR100867551B1 (ko) * 2007-05-18 2008-11-10 삼성전기주식회사 Ｌｅｄ 어레이 구동 장치
JP2009224046A (ja) * 2008-03-13 2009-10-01 Koizumi Lighting Technology Corp Ｌｅｄモジュール、点灯装置、および照明装置
JP5237727B2 (ja) * 2008-08-26 2013-07-17 パナソニック株式会社 Ｌｅｄ駆動装置、照明装置及び照明器具
JP5320588B2 (ja) * 2008-11-13 2013-10-23 東芝ライテック株式会社 Ｌｅｄ照明灯点灯装置および照明器具
JP4676526B2 (ja) * 2008-12-24 2011-04-27 パナソニック株式会社 ランプモジュール

Also Published As

Publication number Publication date
EP2405719A1 (en) 2012-01-11
JP5828104B2 (ja) 2015-12-02
JP2013101988A (ja) 2013-05-23
JP5379921B2 (ja) 2013-12-25
JP5379922B2 (ja) 2013-12-25
JP2012033459A (ja) 2012-02-16
JP2013101987A (ja) 2013-05-23

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