JP2013101987A - Led lighting device and lighting fixture using the same - Google Patents

Led lighting device and lighting fixture using the same Download PDF

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JP2013101987A
JP2013101987A JP2013047103A JP2013047103A JP2013101987A JP 2013101987 A JP2013101987 A JP 2013101987A JP 2013047103 A JP2013047103 A JP 2013047103A JP 2013047103 A JP2013047103 A JP 2013047103A JP 2013101987 A JP2013101987 A JP 2013101987A
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voltage
led lamp
lamp
led
power conversion
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JP5379921B2 (en
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Katsunobu Hamamoto
勝信 濱本
Masashi Yamamoto
真史 山本
Keisuke Ueda
桂介 植田
Hisaya Takikita
久也 滝北
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Panasonic Corp
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • 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

Abstract

PROBLEM TO BE SOLVED: To prevent failure of an LED lamp by suppressing the current that flows when the LED lamp is attached to a lamp socket.SOLUTION: When a voltage exceeding the rated voltage of an LED lamp 110 is output from a power conversion section 2 in unloaded state, an excessive current exceeding the rated value may possibly flow immediately after the LED lamp 110 is connected with a lamp socket 120. In the inventive LED lighting device, a control section 5 stops operation of the power conversion section 2 until a connection determination section 6 determines whether or not the LED lamp 110 is connected. After the connection determination section 6 determines that the LED lamp 110 is connected (loaded condition), the control section 5 starts operation of the power conversion section 2. Since a voltage exceeding the rated voltage is not applied to the LED lamp 110, and the current that flows when the LED lamp 110 is attached to the lamp socket 120 is suppressed, failure of the LED lamp 110 can be prevented.

Description

本発明は、ＬＥＤ(発光ダイオード)を点灯するＬＥＤ点灯装置、及びそれを用いた照明器具に関する。   The present invention relates to an LED lighting device for lighting an LED (light emitting diode), and a lighting fixture using the same.

近年、照明用の光源として蛍光ランプの代わりにＬＥＤが用いられるようになってきている。例えば、特許文献１には従来の直管形の蛍光ランプに近い形状を有するＬＥＤランプが開示されている。このＬＥＤランプは、帯板状の実装基板に多数のＬＥＤが実装されてなる光源ブロックと、光源ブロックを内部に収納する直管形のガラス管と、ガラス管の両端を閉塞する口金と、口金の側面より突出して光源ブロックに給電するための端子ピンとを備えている。このようなＬＥＤランプは、専用の照明器具に設けられているランプソケットに着脱自在に装着され、当該照明器具に搭載されているＬＥＤ点灯装置からランプソケットを介して電力(直流電力)が供給されることで点灯する。   In recent years, LEDs have been used instead of fluorescent lamps as illumination light sources. For example, Patent Document 1 discloses an LED lamp having a shape close to a conventional straight tube fluorescent lamp. This LED lamp includes a light source block in which a large number of LEDs are mounted on a strip-shaped mounting board, a straight glass tube that houses the light source block, a base that closes both ends of the glass tube, and a base And a terminal pin for supplying power to the light source block. Such an LED lamp is detachably attached to a lamp socket provided in a dedicated lighting fixture, and electric power (DC power) is supplied from the LED lighting device mounted on the lighting fixture via the lamp socket. Lights up.

また、ＬＥＤ点灯装置の従来例として、特許文献２に記載されているものがある。特許文献２記載の従来例では、ＬＥＤランプ(ランプソケット)に印加される電圧(出力電圧)と、ＬＥＤランプに流れる電流(出力電流)とを検出し、出力電流が目標値(例えば、ＬＥＤランプの定格電流)に一致するように出力電圧を調整する制御(定電流制御)が行われている。   Moreover, there exists a thing described in patent document 2 as a prior art example of an LED lighting device. In the conventional example described in Patent Document 2, a voltage (output voltage) applied to an LED lamp (lamp socket) and a current (output current) flowing through the LED lamp are detected, and the output current is a target value (for example, an LED lamp). Control (constant current control) is performed to adjust the output voltage so as to coincide with the rated current.

特開２００９−４３４４７号公報JP 2009-43447 A 特開２００６−２１０２７１号公報JP 2006-210271 A

ところで、ＬＥＤランプが交換される場合等においては、ＬＥＤ点灯装置が動作している状態のままでランプソケットからＬＥＤランプが外された後、再度、ＬＥＤランプがランプソケットに装着されることがある。この場合、ランプソケットにＬＥＤランプが装着された直後においては、ＬＥＤランプに定格値を越える過大な電流が流れてしまう虞がある。そして、このような過大な電流が流れてしまうと、ＬＥＤランプの発光ダイオードが故障する可能性があった。   By the way, when the LED lamp is replaced, the LED lamp may be mounted in the lamp socket again after the LED lamp is removed from the lamp socket while the LED lighting device is operating. . In this case, immediately after the LED lamp is mounted in the lamp socket, an excessive current exceeding the rated value may flow through the LED lamp. If such an excessive current flows, there is a possibility that the light emitting diode of the LED lamp may break down.

本発明は、上記課題に鑑みて為されたものであり、ランプソケットにＬＥＤランプが装着されたときに流れる電流を抑制してＬＥＤランプの故障を防止することを目的とする。   The present invention has been made in view of the above problems, and an object thereof is to prevent a failure of an LED lamp by suppressing a current flowing when the LED lamp is mounted in a lamp socket.

本発明のＬＥＤ点灯装置は、出力電圧が可変である電力変換部と、当該電力変換部からランプソケットを介してＬＥＤランプに供給される出力電流を検出する電流検出部と、前記ランプソケットを介して前記ＬＥＤランプに印加される前記出力電圧を検出する電圧検出部と、前記電流検出部で検出される出力電流を目標値に一致させるように前記電力変換部を制御して前記出力電圧を増減する制御部と、前記ランプソケットと前記ＬＥＤランプとの接続の有無を判定する接続判定部と、前記接続判定部に一定電圧を印加する定電圧源とを備え、前記接続判定部は、前記ランプソケットと前記ＬＥＤランプとの接続の有無による電圧変化を検出する検出抵抗を有し、前記検出抵抗の電圧変化に基づいて前記ＬＥＤランプの接続の有無を判定するよう動作し、前記制御部は、前記接続判定部の判定結果が接続無しの場合は前記電力変換部を制御して前記出力電圧を所定の下限値以下に制限し、前記接続判定部の判定結果が接続有りの場合は前記出力電圧を前記下限値以下に制限しないよう制御することを特徴とする。   The LED lighting device of the present invention includes a power conversion unit having a variable output voltage, a current detection unit that detects an output current supplied from the power conversion unit to the LED lamp through the lamp socket, and the lamp socket. The voltage detector that detects the output voltage applied to the LED lamp, and the power converter is controlled to increase or decrease the output voltage so that the output current detected by the current detector matches a target value. And a connection determination unit that determines whether or not the lamp socket and the LED lamp are connected to each other, and a constant voltage source that applies a constant voltage to the connection determination unit, wherein the connection determination unit includes the lamp A detection resistor for detecting a voltage change caused by the presence / absence of a connection between the socket and the LED lamp; When the determination result of the connection determination unit is not connected, the control unit controls the power conversion unit to limit the output voltage to a predetermined lower limit value or less, and the determination result of the connection determination unit When is connected, the output voltage is controlled not to be lower than the lower limit value.

このＬＥＤ点灯装置において、前記定電圧源は、前記ＬＥＤランプに接続され、前記ＬＥＤランプの定格電圧よりも低い一定電圧を前記ＬＥＤランプに印加することが好ましい。   In this LED lighting device, it is preferable that the constant voltage source is connected to the LED lamp and applies a constant voltage lower than a rated voltage of the LED lamp to the LED lamp.

本発明の照明器具は、前記ＬＥＤ点灯装置と、前記ランプソケットと、前記ＬＥＤ点灯装置並びに前記ランプソケットを保持する器具本体とを備えたことを特徴とする。   The lighting fixture of the present invention includes the LED lighting device, the lamp socket, and the fixture lighting main body that holds the LED lighting device and the lamp socket.

本発明のＬＥＤ点灯装置及び照明器具は、ランプソケットにＬＥＤランプが装着されたときに流れる電流を抑制してＬＥＤランプの故障を防止することができるという効果がある。   INDUSTRIAL APPLICABILITY The LED lighting device and the lighting fixture of the present invention have an effect that it is possible to prevent a failure of the LED lamp by suppressing the current that flows when the LED lamp is mounted in the lamp socket.

本発明に係るＬＥＤ点灯装置の実施形態を示す回路ブロック図である。It is a circuit block diagram which shows embodiment of the LED lighting device which concerns on this invention. 別の実施形態を示す回路ブロック図である。It is a circuit block diagram which shows another embodiment. 本発明に係る照明器具の実施形態を示す斜視図である。It is a perspective view which shows embodiment of the lighting fixture which concerns on this invention.

以下、図面を参照して本発明の実施形態を詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は本発明に係るＬＥＤ点灯装置の実施形態を示す回路ブロック図である。   FIG. 1 is a circuit block diagram showing an embodiment of an LED lighting device according to the present invention.

本実施形態のＬＥＤ点灯装置によって点灯されるＬＥＤランプ110は、特許文献１記載のＬＥＤランプと類似の構成を有している。すなわち、このＬＥＤランプ110は、多数の発光ダイオード111の直列回路と、当該直列回路に並列接続された抵抗Rxと、直管形のガラス管(図３参照)と、ガラス管の両端を閉塞する口金(図示せず)とを備えている。なお、口金には、ランプソケット120を介してＬＥＤ点灯装置の出力端に接続される一対の端子ピン(図示せず)が突設されている。そして、ランプソケット120から端子ピンを介して発光ダイオード111に直流電流(出力電流Io)が供給される。   The LED lamp 110 that is turned on by the LED lighting device of the present embodiment has a configuration similar to the LED lamp described in Patent Document 1. That is, the LED lamp 110 closes both ends of a series circuit of a large number of light emitting diodes 111, a resistor Rx connected in parallel to the series circuit, a straight glass tube (see FIG. 3), and the glass tube. And a base (not shown). In addition, a pair of terminal pins (not shown) connected to the output end of the LED lighting device via the lamp socket 120 are projected from the base. Then, a direct current (output current Io) is supplied from the lamp socket 120 to the light emitting diode 111 via the terminal pin.

本実施形態のＬＥＤ点灯装置は、AC/DCコンバータ１、電力変換部２、電流検出部３、電圧検出部４、制御部５、接続判定部６、定電圧源７などを備えている。AC/DCコンバータ１は、商用交流電源100から供給される交流電圧を所望の直流電圧に変換するものであって、例えば、従来周知の昇圧チョッパ回路(力率改善回路)で構成される。   The LED lighting device of this embodiment includes an AC / DC converter 1, a power conversion unit 2, a current detection unit 3, a voltage detection unit 4, a control unit 5, a connection determination unit 6, a constant voltage source 7, and the like. The AC / DC converter 1 converts an AC voltage supplied from the commercial AC power supply 100 into a desired DC voltage, and is configured by, for example, a conventionally known step-up chopper circuit (power factor correction circuit).

電力変換部２は、バイポーラトランジスタや電界効果トランジスタなどの半導体スイッチング素子(以下、スイッチング素子と略す。)20、インダクタＬ、ダイオードＤ、コンデンサC2を具備した従来周知の降圧チョッパ回路からなる。   The power conversion unit 2 includes a conventionally known step-down chopper circuit including a semiconductor switching element (hereinafter abbreviated as a switching element) 20, such as a bipolar transistor or a field effect transistor, an inductor L, a diode D, and a capacitor C2.

電圧検出部４は、電力変換部２の出力端間(コンデンサC2の両端間)に接続された分圧抵抗R1，R2の直列回路からなる。そして、分圧抵抗R1，R2で分圧された検出電圧(出力電圧Voに比例した電圧)が電圧検出部４から制御部５に出力される。また電流検出部３は、電力変換部２の負電位側の出力端とランプソケット120の負極側との間に挿入された検出抵抗R3からなる。そして、出力電流Ioによる検出抵抗R3の電圧降下が検出電圧として電流検出部３から制御部５に出力される。   The voltage detection unit 4 includes a series circuit of voltage dividing resistors R1 and R2 connected between output terminals of the power conversion unit 2 (between both ends of the capacitor C2). The detection voltage (voltage proportional to the output voltage Vo) divided by the voltage dividing resistors R 1 and R 2 is output from the voltage detection unit 4 to the control unit 5. The current detection unit 3 includes a detection resistor R3 inserted between the output terminal on the negative potential side of the power conversion unit 2 and the negative side of the lamp socket 120. A voltage drop of the detection resistor R3 due to the output current Io is output from the current detection unit 3 to the control unit 5 as a detection voltage.

制御部５は、制御用集積回路、またはマイクロコントローラとメモリなどで構成され、電流検出部３で検出される出力電流Ioを目標値に一致させるように電力変換部２を制御して出力電圧Voを増減する。制御部５をマイクロコントローラとメモリで構成する場合は、ＬＥＤランプ110の定格電流値のデータを予めメモリに記憶している。そして、マイクロコントローラ(制御部５)は電流検出部３から受け取る検出電圧を出力電流Ioの大きさ(電流値)に換算し、この電流値がメモリに記憶されている定格電流値(目標値)と一致するようにスイッチング素子20のオンデューティ比を調整して出力電圧Voを増減する。つまり、制御部５はＬＥＤランプ110に一定の電流(定格電流)を流す定電流制御を行っている。   The control unit 5 includes a control integrated circuit or a microcontroller and a memory. The control unit 5 controls the power conversion unit 2 so that the output current Io detected by the current detection unit 3 coincides with the target value, thereby outputting the output voltage Vo. Increase or decrease. When the control unit 5 is configured by a microcontroller and a memory, the rated current value data of the LED lamp 110 is stored in the memory in advance. Then, the microcontroller (control unit 5) converts the detection voltage received from the current detection unit 3 into the magnitude (current value) of the output current Io, and this current value is stored in the rated current value (target value) stored in the memory. The output voltage Vo is increased / decreased by adjusting the on-duty ratio of the switching element 20 so as to match. That is, the control unit 5 performs constant current control in which a constant current (rated current) is supplied to the LED lamp 110.

ここで、ＬＥＤランプ110の定格電圧は、使用されている発光ダイオード111の順方向電圧Vfに当該発光ダイオード111の個数ｎを乗じた値(=Vf×ｎ)となる。例えば、順方向電圧Vfを3.5ボルトとし、発光ダイオード111の個数ｎを20とすれば、3.5×20=70ボルトが定格電圧となり、発光ダイオード111の個数ｎを10とすれば、3.5×10=35ボルトが定格電圧となる。また定格電圧が異なる複数のＬＥＤランプが使用できるように、制御部５が、例えば少なくとも35Ｖから70Ｖまでの範囲で定電流制御を行うようにしてもよい。   Here, the rated voltage of the LED lamp 110 is a value (= Vf × n) obtained by multiplying the forward voltage Vf of the used light emitting diode 111 by the number n of the light emitting diodes 111. For example, if the forward voltage Vf is 3.5 volts, the number n of light emitting diodes 111 is 20, 3.5 × 20 = 70 volts is the rated voltage, and if the number n of light emitting diodes 111 is 10, 3.5 × 10 = 35 volts is the rated voltage. Further, the control unit 5 may perform constant current control in a range of at least 35 V to 70 V, for example, so that a plurality of LED lamps having different rated voltages can be used.

定電圧源７は、AC/DCコンバータ１の高電位側の出力端に一端が接続された抵抗R4と、抵抗R4の他端にカソードが接続されるとともにアノードがランプソケット120の低電位側に接続されたツェナーダイオード70とで構成されている。そして、ツェナーダイオード70の両端(カソード−アノード間)に生じる一定電圧(ツェナー電圧Vz)が抵抗Ｒ５を介してランプソケット120と接続判定部６にそれぞれ印加される。なお、定電圧源７から印加される一定電圧(ツェナー電圧)は、ＬＥＤランプ110の定格電圧よりも低い電圧とする必要がある。定格電圧が異なる複数のＬＥＤランプが使用できるよう構成する場合においては、定格電圧が低いＬＥＤランプを基準として、この定格電圧を下回るように一定電圧(ツェナー電圧)を設定すればよい。さらにＬＥＤランプの定格電圧が危険電圧を上回り、且つ抵抗R5，R6，R7で分圧された電圧が危険電圧を上回る場合においては、定電圧源７から印加される一定電圧(ツェナー電圧)は危険電圧より低い電圧としなければならない。危険電圧の電圧値は、規格によって若干異なるが、一般的には直流では５０Ｖを超える電圧とされている。   The constant voltage source 7 has a resistor R4 having one end connected to the output terminal on the high potential side of the AC / DC converter 1, a cathode connected to the other end of the resistor R4, and an anode on the low potential side of the lamp socket 120. It is composed of a Zener diode 70 connected thereto. Then, a constant voltage (zener voltage Vz) generated at both ends (between the cathode and the anode) of the Zener diode 70 is applied to the lamp socket 120 and the connection determination unit 6 via the resistor R5. The constant voltage (zener voltage) applied from the constant voltage source 7 needs to be lower than the rated voltage of the LED lamp 110. In a case where a plurality of LED lamps having different rated voltages can be used, a constant voltage (zener voltage) may be set to be lower than the rated voltage with reference to an LED lamp having a low rated voltage. Furthermore, when the rated voltage of the LED lamp exceeds the dangerous voltage and the voltage divided by the resistors R5, R6, and R7 exceeds the dangerous voltage, the constant voltage (zener voltage) applied from the constant voltage source 7 is dangerous. Must be lower than the voltage. The voltage value of the dangerous voltage is slightly different depending on the standard, but is generally a voltage exceeding 50 V for direct current.

接続判定部６は、ツェナーダイオード70のカソードとランプソケット120の低電位側との間に接続された３つの抵抗R5，R6，R7の直列回路と、抵抗(検出抵抗)R7における電圧降下をしきい値電圧Vrefと比較する比較器60とを具備している。なお、２つの抵抗R5，R6の接続点がランプソケット120の高電位側に接続されている。ランプソケット120にＬＥＤランプ110が接続されていない状態(無負荷状態)のとき、比較器60の正端子にはツェナー電圧Vzが３つの抵抗R5，R6，R7で分圧された電圧(抵抗R7における電圧降下)が入力される。一方、ランプソケット120にＬＥＤランプ110が接続されている状態(有負荷状態)のとき、ＬＥＤランプ110の抵抗Rxが２つの抵抗R6，R7と並列に接続されることになる。よって、有負荷状態のときの抵抗R7における電圧降下が無負荷状態のときよりも低くなる。ここで、比較器60の負端子に入力されるしきい値電圧Vrefが、有負荷状態のときの抵抗R7における電圧降下と無負荷状態のときの抵抗R7における電圧降下の間に設定されている。従って、比較器60の出力は、無負荷状態のときにＨレベルとなり、有負荷状態のときにＬレベルとなる。なお、比較器60の出力(接続判定部６の判定結果)は制御部５に入力され、比較器60の出力に応じて、制御部５が電力変換部２を動作、または不動作とする。   The connection determination unit 6 performs a voltage drop in the series circuit of three resistors R5, R6, and R7 connected between the cathode of the Zener diode 70 and the low potential side of the lamp socket 120, and the resistor (detection resistor) R7. A comparator 60 for comparing with the threshold voltage Vref is provided. The connection point between the two resistors R5 and R6 is connected to the high potential side of the lamp socket 120. When the LED lamp 110 is not connected to the lamp socket 120 (no load state), a voltage obtained by dividing the Zener voltage Vz by the three resistors R5, R6, and R7 (resistor R7) at the positive terminal of the comparator 60. Voltage drop) is input. On the other hand, when the LED lamp 110 is connected to the lamp socket 120 (loaded state), the resistor Rx of the LED lamp 110 is connected in parallel with the two resistors R6 and R7. Therefore, the voltage drop across the resistor R7 in the loaded state is lower than in the no-load state. Here, the threshold voltage Vref input to the negative terminal of the comparator 60 is set between the voltage drop at the resistor R7 in the loaded state and the voltage drop at the resistor R7 in the unloaded state. . Therefore, the output of the comparator 60 is H level when there is no load, and L level when there is a load. Note that the output of the comparator 60 (the determination result of the connection determination unit 6) is input to the control unit 5, and the control unit 5 activates or deactivates the power conversion unit 2 according to the output of the comparator 60.

次に、本実施形態のＬＥＤ点灯装置の動作を説明する。まず、図示しない電源スイッチが投入されて商用交流電源100からの電源供給が開始されると、AC/DCコンバータ１が動作して直流電圧を出力する。AC/DCコンバータ１から直流電圧が出力されると、定電圧源７から接続判定部６及びランプソケット120に一定電圧(ツェナー電圧Vz)が印加される。そして、接続判定部６が有負荷状態と無負荷状態の判定を行う。制御部５は、接続判定部６の判定結果が有負荷状態であれば、電力変換部２を動作させて定電流制御を開始する。一方、接続判定部６の判定結果が無負荷状態の場合、制御部５は、電力変換部２を動作させない。   Next, operation | movement of the LED lighting device of this embodiment is demonstrated. First, when a power switch (not shown) is turned on and power supply from the commercial AC power supply 100 is started, the AC / DC converter 1 operates to output a DC voltage. When a DC voltage is output from the AC / DC converter 1, a constant voltage (Zener voltage Vz) is applied from the constant voltage source 7 to the connection determination unit 6 and the lamp socket 120. Then, the connection determination unit 6 determines a loaded state and an unloaded state. If the determination result of the connection determination unit 6 is in a loaded state, the control unit 5 operates the power conversion unit 2 and starts constant current control. On the other hand, when the determination result of the connection determination unit 6 is a no-load state, the control unit 5 does not operate the power conversion unit 2.

ここで、無負荷状態のときに電力変換部２からＬＥＤランプ110の定格電圧以上の電圧が出力されていた場合、ランプソケット120にＬＥＤランプ110が接続された直後に定格値を超える過大な電流が流れてしまう虞がある。しかしながら、本実施形態のＬＥＤ点灯装置では、接続判定部６がＬＥＤランプ110の接続の有無を判定するまで制御部５が電力変換部２の動作を停止している。そして、接続判定部６が接続有り(有負荷状態)と判定した後に、制御部５が電力変換部２の動作を開始するので、ＬＥＤランプ110に定格電圧以上の電圧が印加されることがない。その結果、ランプソケット120にＬＥＤランプ110が装着されたときに流れる電流が抑制されるので、ＬＥＤランプ110の故障が防止できる。   Here, when a voltage higher than the rated voltage of the LED lamp 110 is output from the power conversion unit 2 in the no-load state, an excessive current exceeding the rated value immediately after the LED lamp 110 is connected to the lamp socket 120. May flow. However, in the LED lighting device of the present embodiment, the control unit 5 stops the operation of the power conversion unit 2 until the connection determination unit 6 determines whether the LED lamp 110 is connected. And since the control part 5 starts the operation | movement of the power converter 2, after the connection determination part 6 determines with connection (loading state), the voltage more than a rated voltage is not applied to the LED lamp 110. . As a result, since the current that flows when the LED lamp 110 is mounted in the lamp socket 120 is suppressed, a failure of the LED lamp 110 can be prevented.

続いて、電力変換部２が動作している状況でＬＥＤランプ110がランプソケット120から外された場合について説明する。ＬＥＤランプ110がランプソケット120から外されると出力電流Ioが流れなくなるが、制御部５が定電流制御を継続しているために電力変換部２の出力電圧Voが上昇する。そして、電圧検出部４で検出される出力電圧Voが所定の上限値(＞定格電圧)を越えると、制御部５は定電流制御を中止して電力変換部２を停止する。従って、次回、ランプソケット110にＬＥＤランプ110が接続されるとき、上述したように電力変換部２の出力が停止している状態で接続判定部６による接続判定が行われる。さらにＬＥＤランプ110がランプソケット120から外されて電力変換部２を停止した直後は、ランプソケット120に高電圧(＝所定の上限値)が発生している。しかしながら、抵抗Ｒ５の抵抗値を比較的小さく設定することにより、抵抗Ｒ５とツェナーダイオード70を介して電流が流れ、ランプソケット120に印加される電圧を急峻に低下させることができる。   Next, a case where the LED lamp 110 is removed from the lamp socket 120 while the power conversion unit 2 is operating will be described. When the LED lamp 110 is removed from the lamp socket 120, the output current Io does not flow, but the output voltage Vo of the power conversion unit 2 increases because the control unit 5 continues constant current control. When the output voltage Vo detected by the voltage detection unit 4 exceeds a predetermined upper limit value (> rated voltage), the control unit 5 stops the constant current control and stops the power conversion unit 2. Therefore, when the LED lamp 110 is connected to the lamp socket 110 next time, the connection determination by the connection determination unit 6 is performed with the output of the power conversion unit 2 stopped as described above. Further, immediately after the LED lamp 110 is removed from the lamp socket 120 and the power conversion unit 2 is stopped, a high voltage (= predetermined upper limit value) is generated in the lamp socket 120. However, by setting the resistance value of the resistor R5 to be relatively small, a current flows through the resistor R5 and the Zener diode 70, and the voltage applied to the lamp socket 120 can be sharply reduced.

最後に、電力変換部２が動作している状況でＬＥＤランプ110に故障が生じた場合について説明する。但し、ＬＥＤランプ110内の線路が断線(開放)する故障の場合、上述したようにランプソケット110からＬＥＤランプ110が外されたときと実質的に同じ状況であるから、説明は省略する。   Finally, a case where a failure occurs in the LED lamp 110 while the power conversion unit 2 is operating will be described. However, the failure in which the line in the LED lamp 110 is disconnected (opened) is substantially the same as when the LED lamp 110 is removed from the lamp socket 110 as described above, and thus the description thereof is omitted.

ＬＥＤランプ110内の線路が短絡する故障の場合、発光ダイオード111の実質的な個数が減少することになるから、制御部５が定電流制御を行うことで電力変換部２の出力電圧Voが低下する。そして、電圧検出部４で検出される出力電圧が所定値(＜定格電圧)を下回ったとき、制御部５が定電流制御を中止して電力変換部２を停止する。   In the case of a failure in which the line in the LED lamp 110 is short-circuited, the substantial number of the light-emitting diodes 111 is reduced, so that the output voltage Vo of the power conversion unit 2 is reduced by the control unit 5 performing constant current control. To do. When the output voltage detected by the voltage detection unit 4 falls below a predetermined value (<rated voltage), the control unit 5 stops the constant current control and stops the power conversion unit 2.

上述のように、ＬＥＤランプ110に断線や短絡などの故障が生じた場合、制御部５が電力変換部２の動作を停止させるので、故障したＬＥＤランプ110が使用され続けることを防ぐことができる。   As described above, when a failure such as a disconnection or a short circuit occurs in the LED lamp 110, the control unit 5 stops the operation of the power conversion unit 2, so that the failed LED lamp 110 can be prevented from being used continuously. .

なお、本実施形態では無負荷時や故障時に制御部５が電力変換部２を停止させているが、必ずしも停止させる必要は無い。例えば、無負荷時や故障時には、制御部５が電力変換部２を制御し、出力電圧VoをＬＥＤランプ110の定格電圧よりも充分に低い下限値以下に制限しても構わない。また、本実施形態のＬＥＤ点灯装置は１つのＬＥＤランプ110を点灯するものであるが、直列に接続された複数のＬＥＤランプ110を同時に点灯させることも勿論可能である。また、商用交流電源100からの電源供給が開始された後、まず接続判定部６が有負荷状態と無負荷状態の判定を行い、判定結果が有負荷状態であれば、制御部５がAC/DCコンバータ１と電力変換部２とを動作させるようにしてもよい。   In the present embodiment, the control unit 5 stops the power conversion unit 2 at the time of no load or failure, but it is not always necessary to stop it. For example, at the time of no load or failure, the control unit 5 may control the power conversion unit 2 to limit the output voltage Vo to a lower limit value that is sufficiently lower than the rated voltage of the LED lamp 110. Moreover, although the LED lighting device of this embodiment lights one LED lamp 110, it is of course possible to light a plurality of LED lamps 110 connected in series simultaneously. In addition, after the power supply from the commercial AC power supply 100 is started, the connection determination unit 6 first determines the loaded state and the no-load state. If the determination result is the loaded state, the control unit 5 The DC converter 1 and the power converter 2 may be operated.

ところで、電圧検出部４を構成する２つの分圧抵抗R1，R2の直列回路は、ランプソケット120に対して、接続判定部６の２つ抵抗R6，R7の直列回路と並列に接続されている。つまり、電力変換部２の停止中においては、接続判定部６の２つ抵抗R6，R7の直列回路だけでなく、電圧検出部４の２つの分圧抵抗R1，R2の直列回路もAC/DCコンバータ１の出力端間に接続されていることになる。そうすると、AC/DCコンバータ１の出力電圧が起動後に徐々に上昇していく過程において、抵抗R4，R5の接続点の電圧がツェナーダイオード70のツェナー電圧Vzを超えるまでの時間(定電圧源７の出力電圧が安定するまでの時間)が相対的に遅くなってしまう。その結果、接続判定部６が無負荷状態と有負荷状態を判定するまでの時間も長くなり、電源スイッチの投入からＬＥＤランプ110の点灯までのタイムラグが長くなってしまう。   By the way, the series circuit of the two voltage dividing resistors R1 and R2 constituting the voltage detection unit 4 is connected to the lamp socket 120 in parallel with the series circuit of the two resistors R6 and R7 of the connection determination unit 6. . That is, while the power conversion unit 2 is stopped, not only the series circuit of the two resistors R6 and R7 of the connection determination unit 6 but also the series circuit of the two voltage dividing resistors R1 and R2 of the voltage detection unit 4 are AC / DC. It is connected between the output terminals of the converter 1. Then, in the process in which the output voltage of the AC / DC converter 1 gradually increases after startup, the time until the voltage at the connection point of the resistors R4 and R5 exceeds the Zener voltage Vz of the Zener diode 70 (the constant voltage source 7 The time until the output voltage stabilizes becomes relatively slow. As a result, the time until the connection determining unit 6 determines the no-load state and the loaded state also becomes longer, and the time lag from turning on the power switch to turning on the LED lamp 110 becomes longer.

そこで、図２に示すように電圧検出部４と電力変換部２の正電位（高電位）側の出力端との間にツェナーダイオード８が接続されることが好ましい。このツェナーダイオード８は、定電圧源７のツェナーダイオード70よりもツェナー電圧が高いものであって、カソードが電力変換部２の正電位側の出力端に接続され、アノードが電圧検出部４に接続される。つまり、AC/DCコンバータ１の出力電圧が上昇する過程において、抵抗R5，R6の接続点の電圧がツェナーダイオード８のツェナー電圧を超えるまでは、電圧検出部４が接続判定部６及び定電流源７と切り離されていることになる。したがって、ツェナーダイオード８が無い場合(図１)に比較して、定電圧源７の出力電圧が安定するまでの時間を短縮することができる。その結果、接続判定部６が無負荷状態と有負荷状態を判定するまでの時間も短縮され、電源スイッチの投入からＬＥＤランプ110の点灯までのタイムラグも短くなる。   Therefore, as shown in FIG. 2, a Zener diode 8 is preferably connected between the voltage detection unit 4 and the output terminal on the positive potential (high potential) side of the power conversion unit 2. This Zener diode 8 has a higher Zener voltage than the Zener diode 70 of the constant voltage source 7, and has a cathode connected to the output terminal on the positive potential side of the power converter 2 and an anode connected to the voltage detector 4. Is done. That is, in the process in which the output voltage of the AC / DC converter 1 increases, the voltage detection unit 4 and the constant current source are connected until the voltage at the connection point of the resistors R5 and R6 exceeds the Zener voltage of the Zener diode 8. 7 is separated. Therefore, the time until the output voltage of the constant voltage source 7 is stabilized can be shortened as compared with the case where the Zener diode 8 is not provided (FIG. 1). As a result, the time until the connection determining unit 6 determines the no-load state and the loaded state is shortened, and the time lag from turning on the power switch to turning on the LED lamp 110 is shortened.

ところで、本実施形態のＬＥＤ点灯装置は、例えば、図３に示す照明器具に搭載される。この照明器具は、天井に直付けされる器具本体130と、器具本体130に設けられた一対のランプソケット120，120とを備えている。   By the way, the LED lighting device of this embodiment is mounted in the lighting fixture shown in FIG. 3, for example. The lighting fixture includes a fixture main body 130 that is directly attached to the ceiling, and a pair of lamp sockets 120 and 120 provided on the fixture main body 130.

器具本体130は、長手方向から見た側面形状が台形である長尺の角筒状に形成され、その内部にＬＥＤ点灯装置が収納されている。そして、器具本体130の下面における長手方向両端部にそれぞれランプソケット120，120が配設されている。このランプソケット120，120は、従来周知である直管形の蛍光ランプ用のランプソケットと同一構造を有している。ここで、２つのランプソケット120，120のいずれか一方からＬＥＤランプ110へ直流電流を供給する場合においては、蛍光ランプがランプソケット120，120に誤装着されたときにフィラメント部に直流電流が供給される虞がある。しかしながら、上述のように電圧検出部４で検出される出力電圧が所定値(＜定格電圧)を下回ったときに電力変換部２を停止しているため、蛍光ランプが誤装着された場合にも不安全な現象や点灯装置の故障などが生じる虞がない。但し、使用者は蛍光ランプを誤装着して安全か不安全かを見分けることができない。そこで、ＬＥＤランプ110の口金の電極形状を蛍光ランプと異なる構造として誤装着を防止し、ランプソケット120，120はＬＥＤランプ110の口金に合致した構造としてもよい。   The instrument main body 130 is formed in a long rectangular tube shape having a trapezoidal side surface as viewed from the longitudinal direction, and an LED lighting device is accommodated therein. Then, lamp sockets 120 and 120 are disposed at both ends in the longitudinal direction on the lower surface of the instrument main 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. Here, when a direct current is supplied from either one of the two lamp sockets 120, 120 to the LED lamp 110, a direct current is supplied to the filament portion when the fluorescent lamp is erroneously attached to the lamp sockets 120, 120. There is a risk of being. However, since the power conversion unit 2 is stopped when the output voltage detected by the voltage detection unit 4 falls below a predetermined value (<rated voltage) as described above, even when the fluorescent lamp is erroneously mounted. There is no risk of unsafe phenomena or failure of the lighting device. However, the user cannot distinguish between safe and unsafe by mistakenly attaching the fluorescent lamp. Accordingly, the electrode shape of the base of the LED lamp 110 may be different from that of the fluorescent lamp to prevent erroneous mounting, and the lamp sockets 120 and 120 may have a structure that matches the base of the LED lamp 110.

２ 電力変換部
３ 電流検出部
４ 電圧検出部
５ 制御部
６ 接続判定部
110 ＬＥＤランプ
120 ランプソケット 2 Power conversion unit 3 Current detection unit 4 Voltage detection unit 5 Control unit 6 Connection determination unit
110 LED lamp
120 Lamp socket

Claims (3)

出力電圧が可変である電力変換部と、当該電力変換部からランプソケットを介してＬＥＤランプに供給される出力電流を検出する電流検出部と、前記ランプソケットを介して前記ＬＥＤランプに印加される前記出力電圧を検出する電圧検出部と、前記電流検出部で検出される出力電流を目標値に一致させるように前記電力変換部を制御して前記出力電圧を増減する制御部と、前記ランプソケットと前記ＬＥＤランプとの接続の有無を判定する接続判定部と、前記接続判定部に一定電圧を印加する定電圧源とを備え、
前記接続判定部は、前記ランプソケットと前記ＬＥＤランプとの接続の有無による電圧変化を検出する検出抵抗を有し、前記検出抵抗の電圧変化に基づいて前記ＬＥＤランプの接続の有無を判定するよう動作し、
前記制御部は、前記接続判定部の判定結果が接続無しの場合は前記電力変換部を制御して前記出力電圧を所定の下限値以下に制限し、前記接続判定部の判定結果が接続有りの場合は前記出力電圧を前記下限値以下に制限しないよう制御することを特徴とするＬＥＤ点灯装置。 A power conversion unit having a variable output voltage, a current detection unit for detecting an output current supplied from the power conversion unit to the LED lamp through the lamp socket, and the LED lamp through the lamp socket. A voltage detection unit for detecting the output voltage; a control unit for controlling the power conversion unit to increase or decrease the output voltage so that the output current detected by the current detection unit matches a target value; and the lamp socket And a connection determination unit that determines whether or not the LED lamp is connected, and a constant voltage source that applies a constant voltage to the connection determination unit,
The connection determination unit includes a detection resistor that detects a voltage change depending on whether or not the lamp socket and the LED lamp are connected, and determines whether or not the LED lamp is connected based on a voltage change of the detection resistor. Work,
When the determination result of the connection determination unit is not connected, the control unit controls the power conversion unit to limit the output voltage to a predetermined lower limit value or less, and the determination result of the connection determination unit is connected In this case, the LED lighting device is controlled so that the output voltage is not limited to the lower limit value or less. 前記定電圧源は、前記ＬＥＤランプに接続され、前記ＬＥＤランプの定格電圧よりも低い一定電圧を前記ＬＥＤランプに印加することを特徴とする請求項１に記載のＬＥＤ点灯装置。   The LED lighting device according to claim 1, wherein the constant voltage source is connected to the LED lamp and applies a constant voltage lower than a rated voltage of the LED lamp to the LED lamp. 請求項１又は２のＬＥＤ点灯装置と、前記ランプソケットと、前記ＬＥＤ点灯装置並びに前記ランプソケットを保持する器具本体とを備えたことを特徴とする照明器具。   3. A lighting fixture comprising: the LED lighting device according to claim 1; the lamp socket; and a fixture main body for holding the LED lighting device and the lamp socket.
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