JP2017016919A - LED lighting circuit and LED lighting device - Google Patents

LED lighting circuit and LED lighting device Download PDF

Info

Publication number
JP2017016919A
JP2017016919A JP2015133547A JP2015133547A JP2017016919A JP 2017016919 A JP2017016919 A JP 2017016919A JP 2015133547 A JP2015133547 A JP 2015133547A JP 2015133547 A JP2015133547 A JP 2015133547A JP 2017016919 A JP2017016919 A JP 2017016919A
Authority
JP
Japan
Prior art keywords
circuit
voltage
control signal
led lighting
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.)
Granted
Application number
JP2015133547A
Other languages
Japanese (ja)
Other versions
JP6550977B2 (en
Inventor
鈴木　信一
Shinichi Suzuki
信一 鈴木
将武 山下
Masatake Yamashita
将武 山下
良明 山口
Yoshiaki Yamaguchi
良明 山口
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.)
Iwasaki Denki KK
Original Assignee
Iwasaki Denki KK
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 Iwasaki Denki KK filed Critical Iwasaki Denki KK
Priority to JP2015133547A priority Critical patent/JP6550977B2/en
Publication of JP2017016919A publication Critical patent/JP2017016919A/en
Application granted granted Critical
Publication of JP6550977B2 publication Critical patent/JP6550977B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To provide a high-efficiency and simple circuit configuration for performing an appropriate protection operation without generating an unwanted circuit current in the case of a load short-circuit failure in an LED lighting circuit.SOLUTION: An LED lighting circuit (100) comprises: a DC power supply circuit (300) that supplies a DC current to an LED (70); a detection circuit (400) that detects at least an output voltage of the DC power supply circuit; and a control circuit (600) including a control signal generation part (610) that generates a control signal within a predetermined voltage range, a drive control part (620) which controls drive of the DC power supply circuit in such a manner that an output current is reduced in response to reduction of a voltage of the control signal, and a protective switching part (630) that switches the control signal to a minimum voltage equal to or lower than a lower limit value of the predetermined voltage range in the case where the output voltage detected by the detection circuit is lower than a predetermined value.SELECTED DRAWING: Figure 1

Description

本発明はＬＥＤ点灯回路及びそれを用いたＬＥＤ点灯装置に関する。   The present invention relates to an LED lighting circuit and an LED lighting device using the same.

特許文献１はＬＥＤに対して定電流制御又は定電圧制御を行うＬＥＤ点灯装置を開示する。同文献のＬＥＤ点灯装置はＬＥＤ（２）及び点灯ユニット（５）を備える。点灯ユニットは、ＬＥＤの接続数が所定値未満の場合には電流検出抵抗（４０）に流れる出力電流が設定値で一定となるように定電流制御を行う。また、点灯ユニットは、ＬＥＤの接続数が所定値以上の場合には電圧検出抵抗（３０、３１）に発生する電圧が設定値以上とならないように定電圧制御を行う。これにより、直列接続されたＬＥＤの個数に応じて定電流制御又は定電圧制御が行われ、特に、複数のＬＥＤのうちの一部が短絡故障しても残りのＬＥＤが定電流制御される。   Patent Document 1 discloses an LED lighting device that performs constant current control or constant voltage control on an LED. The LED lighting device of the same document includes an LED (2) and a lighting unit (5). When the number of connected LEDs is less than a predetermined value, the lighting unit performs constant current control so that the output current flowing through the current detection resistor (40) is constant at the set value. The lighting unit performs constant voltage control so that the voltage generated in the voltage detection resistors (30, 31) does not exceed a set value when the number of connected LEDs is equal to or greater than a predetermined value. Thereby, constant current control or constant voltage control is performed according to the number of LEDs connected in series. In particular, even if a part of the plurality of LEDs is short-circuited, the remaining LEDs are constant current controlled.

特許文献２はＬＥＤの短絡故障時に、ＤＣ／ＤＣコンバータ（２）からＬＥＤ（４）に流れる電流を制限する点灯装置を開示する。点灯装置は、ＬＥＤの電圧を検出する電圧検出手段（Ｒ２、Ｒ３）と、ＬＥＤに直列接続されたスイッチング素子（ＳＷ１）と、スイッチング素子を制御する出力電圧判別部（３）とを備える。具体的には、検出電圧がＬＥＤの短絡判別用の所定値以下となった場合に出力電圧判定部によってスイッチング素子がオフ状態とされ、ＬＥＤ電流の経路が遮断される。また、スイッチング素子に並列接続された限流抵抗（Ｒｓ）により、一部のＬＥＤに短絡故障が生じてスイッチング素子が開放された場合であっても他の正常なＬＥＤに電流が流れ、減光点灯が行われる。   Patent Document 2 discloses a lighting device that limits the current flowing from the DC / DC converter (2) to the LED (4) when a short circuit failure occurs in the LED. The lighting device includes voltage detection means (R2, R3) for detecting the voltage of the LED, a switching element (SW1) connected in series with the LED, and an output voltage determination unit (3) for controlling the switching element. Specifically, when the detected voltage is equal to or lower than a predetermined value for determining the short circuit of the LED, the output voltage determining unit turns off the switching element, and the LED current path is blocked. In addition, due to a current limiting resistor (Rs) connected in parallel to the switching element, even if a short circuit failure occurs in some LEDs and the switching elements are opened, current flows to other normal LEDs, resulting in dimming Lighting is performed.

特開２００８−２８３２０６号公報JP 2008-283206 A 特開２０１０−１２９６１２号公報JP 2010-129612 A

しかし、特許文献１の構成によると、接続されたＬＥＤ全体が短絡故障した場合の動作が検討されていない。また近年では、ＬＥＤの定電流制御用のドライバＩＣが普及しているが、上記のような負荷短絡に対する保護機能を有するドライバＩＣは存在しない。したがって、ＬＥＤ全体が短絡故障した場合にＬＥＤ正常時と同様の定電流制御を行うと、不要な出力電流が回路に流れ続けることになり、この不要な出力電流によって回路部品の発熱及びそれに伴う故障が発生し得るため、回路の信頼性確保の観点から好ましくない。   However, according to the configuration of Patent Document 1, the operation in the case where the entire connected LED is short-circuited has not been studied. In recent years, driver ICs for constant current control of LEDs have become widespread, but there is no driver IC having a protection function against the load short circuit as described above. Therefore, if constant current control is performed in the same way as when the LED is normal when the entire LED is short-circuited, unnecessary output current will continue to flow through the circuit. Is not preferable from the viewpoint of ensuring the reliability of the circuit.

また、特許文献２の構成によると、ＬＥＤ電流を遮断するためのスイッチング素子がＬＥＤ電流の経路上に配置される。この構成においては、ＬＥＤの全部又は一部短絡時の過電流がスイッチング素子の開放動作により抑制されるものの、正常点灯時において導通状態が維持されるスイッチング素子での電力損失によって回路効率が低下してしまう。またさらに、スイッチング素子に限流抵抗が並列接続される構成においては、スイッチング素子開放時に限流抵抗による電力損失が発生してしまう。言い換えると、限流抵抗に定格電力の大きな抵抗を用いる必要があり、これにより回路が高コスト化及び大型化してしまう。   Further, according to the configuration of Patent Document 2, a switching element for cutting off the LED current is arranged on the LED current path. In this configuration, although the overcurrent at the time when all or part of the LED is short-circuited is suppressed by the opening operation of the switching element, the circuit efficiency is reduced due to the power loss in the switching element that maintains the conduction state during normal lighting. End up. Furthermore, in the configuration in which the current limiting resistor is connected in parallel to the switching element, power loss due to the current limiting resistance occurs when the switching element is opened. In other words, it is necessary to use a resistor having a large rated power as the current limiting resistor, which increases the cost and size of the circuit.

そこで、本発明は、ＬＥＤ点灯回路において、負荷短絡故障時に不要な回路電流を発生させずに適切な保護動作を行うことを可能とする構成を、高効率かつ簡素な回路構成で提供することを課題とする。   Therefore, the present invention provides a configuration that enables an appropriate protection operation to be performed without generating an unnecessary circuit current in the case of a load short-circuit failure in an LED lighting circuit with a highly efficient and simple circuit configuration. Let it be an issue.

本発明のＬＥＤ点灯回路は、ＬＥＤに直流電流を供給する直流電源回路と、直流電源回路の少なくとも出力電圧を検出する検出回路と、所定電圧範囲の制御信号を生成する制御信号生成部、制御信号の電圧の低下に対して出力電流が低減されるように直流電源回路を駆動制御する駆動制御部、及び検出回路によって検出される出力電圧が所定値未満となる場合に制御信号を所定電圧範囲の下限値以下の最小電圧に切り換える保護切換部を有する制御回路とを備える。   The LED lighting circuit of the present invention includes a DC power supply circuit that supplies a direct current to the LED, a detection circuit that detects at least an output voltage of the DC power supply circuit, a control signal generation unit that generates a control signal in a predetermined voltage range, and a control signal A drive control unit that drives and controls the DC power supply circuit so that the output current is reduced in response to a decrease in the voltage of the output, and when the output voltage detected by the detection circuit is less than a predetermined value, the control signal is set within a predetermined voltage range. And a control circuit having a protection switching unit that switches to a minimum voltage equal to or lower than the lower limit value.

上記ＬＥＤ点灯回路によると、制御信号電圧の低下に対して出力電流が低減される構成において、負荷短絡が発生して出力電圧が所定値未満となる場合に制御信号を所定電圧範囲の下限値以下の最小電圧に切り換えるように構成される。これにより、制御回路が直流電源回路の出力を停止又は最小化させることが可能となる。したがって、負荷短絡故障時に不要な回路電流を発生させずに適切な保護動作を行うことが可能となる。また、ＬＥＤ電流の経路に追加のスイッチング素子又は限流素子を必要としないため、通常点灯時及び保護動作時の回路効率が不要に損なわれることはなく、高効率かつ簡素な回路構成となる。   According to the LED lighting circuit, in the configuration in which the output current is reduced with respect to the decrease in the control signal voltage, when the load short circuit occurs and the output voltage becomes less than the predetermined value, the control signal is less than the lower limit value of the predetermined voltage range. Is configured to switch to the minimum voltage. As a result, the control circuit can stop or minimize the output of the DC power supply circuit. Therefore, an appropriate protection operation can be performed without generating an unnecessary circuit current at the time of a load short-circuit failure. Further, since no additional switching element or current limiting element is required in the LED current path, the circuit efficiency during normal lighting and protection operation is not unnecessarily impaired, and the circuit configuration is highly efficient and simple.

また、検出回路が直流電源回路の出力電流を検出するように構成され、制御信号生成部が、検出回路によって検出された出力電流と目標値との誤差を増幅することによって所定電圧範囲の制御信号を生成する誤差増幅回路を形成していることが好ましい。これにより、通常点灯時においては出力電流の定電流制御が行われるので、安定した出力電流制御が実行されるとともに出力電圧が安定し、負荷短絡発生の検出精度が向上する。   Further, the detection circuit is configured to detect the output current of the DC power supply circuit, and the control signal generation unit amplifies an error between the output current detected by the detection circuit and the target value, thereby controlling the control signal within a predetermined voltage range. It is preferable to form an error amplifier circuit that generates As a result, constant current control of the output current is performed during normal lighting, so that stable output current control is performed, the output voltage is stabilized, and the detection accuracy of load short-circuit occurrence is improved.

ここで、上記最小電圧が所定電圧範囲の下限値未満の電圧であることが好ましい。これにより、所定電圧範囲内の制御信号による通常動作の構成と、最小電圧の制御信号による保護動作の構成とを独立して設定することができ、制御回路の設計の自由度が増す。   Here, the minimum voltage is preferably a voltage less than the lower limit value of the predetermined voltage range. Thereby, the configuration of the normal operation by the control signal within the predetermined voltage range and the configuration of the protection operation by the control signal of the minimum voltage can be set independently, and the degree of freedom in designing the control circuit is increased.

またさらに、制御回路は、制御信号が最小電圧に切り換えられた状態において通電されて発光するように接続された発光素子を備えていてもよい。このように、保護動作時に発光素子が発光することにより、負荷短絡故障をユーザに報知することができる。   Still further, the control circuit may include a light emitting element connected to be energized and emit light in a state where the control signal is switched to the minimum voltage. In this way, the light emitting element emits light during the protection operation, so that a load short circuit failure can be notified to the user.

より詳細には、直流電源回路は、スイッチング素子を有する入力側の一次側回路及び一次側回路から絶縁されてＬＥＤが接続される二次側回路を有するフライバックコンバータからなり、駆動制御部が一次側回路と同じ基準電位に対して動作し、検出回路、制御信号生成部及び保護切換部が二次側回路と同じ基準電位に対して動作し、制御信号がフォトカプラを介して一次側回路から二次側回路に入力され、制御信号の電圧の低下に応じてフォトカプラのフォトダイオード電流及びフォトトランジスタ電流が増加するように構成され、駆動制御部がフォトトランジスタ電流の増加に応じてスイッチング素子のＰＷＭ駆動におけるオン幅を減少させ、又はＰＷＭ駆動を停止させるように構成されることが好ましい。このように、絶縁型のフライバックコンバータを用いた構成において、より簡素な構成のＬＥＤ点灯回路が実現される。   More specifically, the DC power supply circuit includes a primary circuit on the input side having a switching element and a flyback converter having a secondary circuit that is insulated from the primary circuit and connected to the LED, and the drive control unit is the primary. Operates on the same reference potential as the side circuit, the detection circuit, the control signal generator and the protection switching unit operate on the same reference potential as the secondary circuit, and the control signal is transmitted from the primary circuit via the photocoupler. The photodiode current and the phototransistor current of the photocoupler are input in accordance with a decrease in the voltage of the control signal input to the secondary circuit, and the drive control unit is configured to switch the switching element according to the increase in the phototransistor current. It is preferable that the ON width in the PWM drive is reduced or the PWM drive is stopped. In this way, an LED lighting circuit having a simpler configuration is realized in the configuration using the insulating flyback converter.

本発明のＬＥＤ照明装置は、筐体に収容された上記ＬＥＤ点灯回路と、ＬＥＤが実装され、ＬＥＤ点灯回路に配線接続されたＬＥＤユニットとを備える。これにより、負荷短絡故障後も、負荷を修理又は交換すればＬＥＤ照明装置の使用を継続することができ、保守コストが低減される。   The LED lighting device of the present invention includes the LED lighting circuit housed in a housing, and an LED unit on which the LED is mounted and connected to the LED lighting circuit by wiring. Thereby, even after a load short-circuit failure, if the load is repaired or replaced, the use of the LED lighting device can be continued, and the maintenance cost is reduced.

本発明の第１の実施形態のＬＥＤ点灯回路及びＬＥＤ照明装置を示す図である。It is a figure which shows the LED lighting circuit and LED lighting apparatus of the 1st Embodiment of this invention. 第１の実施形態の制御回路を説明する図である。It is a figure explaining the control circuit of 1st Embodiment. 本発明の第２の実施形態のＬＥＤ点灯回路及びＬＥＤ照明装置を示す図である。It is a figure which shows the LED lighting circuit and LED lighting apparatus of the 2nd Embodiment of this invention. 本発明の変形例による制御回路を示す図である。It is a figure which shows the control circuit by the modification of this invention.

＜第１の実施形態＞
図１に、本発明の第１の実施形態によるＬＥＤ点灯回路１００及びそれを用いたＬＥＤ照明装置１５０を示す。ＬＥＤ照明装置１５０はＬＥＤ点灯回路１００及びＬＥＤユニット７００からなる。ＬＥＤ点灯回路１００は交流電源ＡＣ（例えば、商用電源）からの交流入力を直流出力に変換し、配線Ｗ１及びＷ２を介して直流出力をＬＥＤユニット７００に供給する。ＬＥＤ点灯回路１００は不図示の筐体に内包される。 <First Embodiment>
FIG. 1 shows an LED lighting circuit 100 according to a first embodiment of the present invention and an LED lighting device 150 using the same. The LED lighting device 150 includes an LED lighting circuit 100 and an LED unit 700. The LED lighting circuit 100 converts an AC input from an AC power source AC (for example, a commercial power source) into a DC output, and supplies the DC output to the LED unit 700 via the wirings W1 and W2. The LED lighting circuit 100 is included in a housing (not shown).

ＬＥＤ点灯回路１００は、入力端子Ｔ１及びＴ２と出力端子Ｔ３及びＴ４の間に、入力回路２００、直流電源回路３００、検出回路４００、補助電源回路５００及び制御回路６００を備える。出力端子Ｔ３及びＴ４にはそれぞれ配線Ｗ１及びＷ２が接続される。なお、本明細書における説明において、各回路素子が上記のどの回路に属するかは便宜的なものであり、本発明を拘束するものではない。   The LED lighting circuit 100 includes an input circuit 200, a DC power supply circuit 300, a detection circuit 400, an auxiliary power supply circuit 500, and a control circuit 600 between input terminals T1 and T2 and output terminals T3 and T4. Wirings W1 and W2 are connected to the output terminals T3 and T4, respectively. In the description in this specification, it is convenient for each circuit element to belong to which circuit, and the present invention is not bound thereto.

ＬＥＤユニット７００は、入力端子Ｔ５及びＴ６を有し、入力端子Ｔ５−Ｔ６間にはＬＥＤ７０が実装される。ＬＥＤ７０のアノード端は、入力端子Ｔ５及び配線Ｗ１を介してＬＥＤ点灯回路１００の出力端子Ｔ３に接続され、ＬＥＤ７０のカソード端は、入力端子Ｔ６及び配線Ｗ２を介して出力端子Ｔ４に接続される。ＬＥＤ７０はＬＥＤアレイを構成し、その素子数は任意である。   The LED unit 700 has input terminals T5 and T6, and the LED 70 is mounted between the input terminals T5 and T6. The anode end of the LED 70 is connected to the output terminal T3 of the LED lighting circuit 100 via the input terminal T5 and the wiring W1, and the cathode end of the LED 70 is connected to the output terminal T4 via the input terminal T6 and the wiring W2. The LED 70 forms an LED array, and the number of elements is arbitrary.

ここで、以降の説明において、「負荷」とは、ＬＥＤ点灯回路１００の出力端子Ｔ３及びＴ４よりもＬＥＤユニット７００側の構成要素を総称したものと定義する。すなわち、負荷は、ＬＥＤユニット７００、ＬＥＤ７０並びに配線Ｗ１及びＷ２の１以上を含むものとする。したがって、「負荷短絡」とは、ＬＥＤユニット７００内部でのＬＥＤ７０の全部又は一部の短絡、ＬＥＤユニット７００の端子Ｔ５−Ｔ６間又は配線Ｗ１−Ｗ２間の偶発的な短絡等を含むものとする。   Here, in the following description, “load” is defined as a general term for components on the LED unit 700 side of the output terminals T3 and T4 of the LED lighting circuit 100. That is, the load includes one or more of the LED unit 700, the LED 70, and the wirings W1 and W2. Therefore, the “load short circuit” includes a short circuit of all or a part of the LEDs 70 in the LED unit 700, an accidental short circuit between the terminals T5 to T6 of the LED unit 700 or the wirings W1 to W2.

整流回路２００は、電流ヒューズ１及び２、ダイオードブリッジ３、コンデンサ４、及び必要に応じてノイズフィルタを備える。入力回路２００には交流電源ＡＣからの交流電圧が入力され、ダイオードブリッジ３による全波整流出力が出力される。なお、直流電源からの直流電圧がＬＥＤ点灯回路１００に入力される場合には整流回路２００は不要である。   The rectifier circuit 200 includes current fuses 1 and 2, a diode bridge 3, a capacitor 4, and a noise filter as necessary. An AC voltage from the AC power supply AC is input to the input circuit 200, and a full-wave rectified output by the diode bridge 3 is output. Note that the rectifier circuit 200 is not required when a DC voltage from a DC power source is input to the LED lighting circuit 100.

直流電源回路３００は、本実施形態では絶縁型フライバックコンバータからなり、力率改善機能を持つ所謂ワンコンバータ方式のフライバック回路を構成する。直流電源回路３００は、スイッチング素子５、トランス６、抵抗７、ダイオード８及び平滑コンデンサ９を備える。スイッチング素子５のオン期間にトランス６の一次巻線によって全波整流出力からのエネルギーが蓄積され、スイッチング素子５のオフ期間にそのエネルギーが二次巻線側からダイオード８を介して平滑コンデンサ９に充電される。トランス６における一次電圧から二次電圧への出力比は一次巻線に対する二次巻線の巻数比によって決まり、出力電流値はスイッチング素子５のオンデューティ（オン幅）によって決まる。スイッチング素子５は、後述する制御回路６００の制御ＩＣ２５によってＰＷＭ駆動される。抵抗７は電流検出用の抵抗であり、抵抗７に発生する電圧が制御ＩＣ２５に入力され、スイッチング素子５のＰＷＭ制御において参照される。   In the present embodiment, the DC power supply circuit 300 is composed of an insulating flyback converter, and constitutes a so-called one-converter type flyback circuit having a power factor correction function. The DC power supply circuit 300 includes a switching element 5, a transformer 6, a resistor 7, a diode 8, and a smoothing capacitor 9. The energy from the full-wave rectified output is accumulated by the primary winding of the transformer 6 during the ON period of the switching element 5, and the energy is transferred from the secondary winding side to the smoothing capacitor 9 via the diode 8 during the OFF period of the switching element 5. Charged. The output ratio from the primary voltage to the secondary voltage in the transformer 6 is determined by the turn ratio of the secondary winding to the primary winding, and the output current value is determined by the ON duty (ON width) of the switching element 5. The switching element 5 is PWM driven by a control IC 25 of a control circuit 600 described later. The resistor 7 is a resistor for current detection. A voltage generated in the resistor 7 is input to the control IC 25 and is referred to in PWM control of the switching element 5.

なお、以降の説明において、トランス６の一次巻線側（入力側）の回路を一次側回路といい、その基準電位（コンデンサ４の低電位側電極の電位）を一次側グランドＧ１というものとする。また、トランス６の二次巻線側（ＬＥＤユニット７００側）の回路を二次側回路といい、その基準電位（平滑コンデンサ９の低電位側電極の電位）を二次側グランドＧ２というものとする。また、以降の説明において、直流電源回路３００の出力電圧を単に「出力電圧」といい、直流電源回路３００の出力電流を単に「出力電流」という。   In the following description, a circuit on the primary winding side (input side) of the transformer 6 is referred to as a primary side circuit, and a reference potential thereof (potential of the low potential side electrode of the capacitor 4) is referred to as a primary side ground G1. . The circuit on the secondary winding side (LED unit 700 side) of the transformer 6 is called a secondary side circuit, and its reference potential (the potential of the low potential side electrode of the smoothing capacitor 9) is called the secondary side ground G2. To do. In the following description, the output voltage of the DC power supply circuit 300 is simply referred to as “output voltage”, and the output current of the DC power supply circuit 300 is simply referred to as “output current”.

検出回路４００は、分圧抵抗１０、１１及び１２からなる電圧検出回路、並びに電流検出抵抗１３からなる電流検出回路を含む。電圧検出抵抗１０、１１及び１２は直流電源回路３００のコンデンサ９に並列接続された分圧抵抗回路からなる。出力電圧に比例した電圧が分圧抵抗１２に発生し、この電圧が電圧検出値として制御回路６００に入力される。電流検出抵抗１３は二次側グランドＧ２と端子Ｔ４の間に挿入された低抵抗素子からなる。出力電流に比例した電圧が電流検出抵抗１３に発生し、この電圧が電流検出値として制御回路６００に入力される。   The detection circuit 400 includes a voltage detection circuit including voltage dividing resistors 10, 11 and 12 and a current detection circuit including a current detection resistor 13. The voltage detection resistors 10, 11, and 12 are voltage dividing resistor circuits connected in parallel to the capacitor 9 of the DC power supply circuit 300. A voltage proportional to the output voltage is generated in the voltage dividing resistor 12, and this voltage is input to the control circuit 600 as a voltage detection value. The current detection resistor 13 includes a low resistance element inserted between the secondary side ground G2 and the terminal T4. A voltage proportional to the output current is generated in the current detection resistor 13, and this voltage is input to the control circuit 600 as a current detection value.

補助電源回路５００は、トランス６の一次側補助巻線、ダイオード１４及びコンデンサ１５を有して一次側グランドＧ１を基準電位とする一次側回路、並びにトランス６の二次側補助巻線、ダイオード１６、コンデンサ１７及び定電圧回路１８を有して二次側グランドＧ２を基準電位とする二次側回路を備える。補助電源回路５００は、スイッチング素子５のスイッチング動作に基づいて制御回路６００の制御電源を生成する。一次側補助巻線に発生する電圧がダイオード１４及びコンデンサ１５によって整流及び平滑され、この平滑された電圧が制御回路６００の一次側回路に制御電源Ｖｓとして供給される。二次側補助巻線に発生する電圧はダイオード１６及びコンデンサ１７によって整流及び平滑される。コンデンサ１７の電圧は、定電圧回路１８によって定電圧化され、制御回路６００の二次側回路に制御電源Ｖｃｃとして供給される。定電圧回路１８は、三端子レギュレータ、シリーズレギュレータ等である。なお、制御電源Ｖｃｃは、トランス６の補助巻線から得られる電圧に加えて、又はそれに代えてはコンデンサ９の電圧をもとに供給されるようにしてもよい。   The auxiliary power supply circuit 500 includes a primary side auxiliary winding of the transformer 6, a diode 14 and a capacitor 15 and a primary side circuit having the primary side ground G1 as a reference potential, and a secondary side auxiliary winding of the transformer 6 and a diode 16. And a secondary side circuit having a capacitor 17 and a constant voltage circuit 18 and having the secondary side ground G2 as a reference potential. The auxiliary power circuit 500 generates a control power source for the control circuit 600 based on the switching operation of the switching element 5. The voltage generated in the primary side auxiliary winding is rectified and smoothed by the diode 14 and the capacitor 15, and the smoothed voltage is supplied to the primary side circuit of the control circuit 600 as the control power source Vs. The voltage generated in the secondary side auxiliary winding is rectified and smoothed by the diode 16 and the capacitor 17. The voltage of the capacitor 17 is made constant by the constant voltage circuit 18 and supplied to the secondary circuit of the control circuit 600 as the control power supply Vcc. The constant voltage circuit 18 is a three-terminal regulator, a series regulator, or the like. The control power supply Vcc may be supplied based on the voltage of the capacitor 9 in addition to or instead of the voltage obtained from the auxiliary winding of the transformer 6.

制御回路６００は、制御信号生成部６１０、駆動制御部６２０及び保護切換部６３０を含む。駆動制御部６２０は制御電源Ｖｓを受けて一次側グランドＧ１を基準電位として動作し、制御信号生成部６１０及び保護切換部６３０は制御電源Ｖｃｃを受けて二次側グランドＧ２を基準電位として動作する。   The control circuit 600 includes a control signal generation unit 610, a drive control unit 620, and a protection switching unit 630. The drive control unit 620 receives the control power source Vs and operates using the primary side ground G1 as the reference potential, and the control signal generation unit 610 and the protection switching unit 630 receive the control power source Vcc and operates using the secondary side ground G2 as the reference potential. .

誤差増幅部６１０は、オペアンプ１９、抵抗２０及び２１、ダイオード２２、抵抗２３及び２４、並びにフォトカプラ２６の入力フォトダイオード２６ｄを含み、全体として誤差増幅回路を形成する。オペアンプ１９の負入力端子（−）には、検出回路４００からの電流検出値が入力され、オペアンプ１９の正入力端子（＋）には基準電圧が入力される。この基準電圧は、出力電流の目標値に対応し、制御電源Ｖｃｃの抵抗２０及び２１による分圧値によって決定される。オペアンプ１９の負入力端子と出力端子間には不図示の帰還素子（抵抗、コンデンサ、又はこれらの直列回路若しくは並列回路）が接続され、負入力端子電圧と正入力端子電圧の誤差が出力端子において出力される。オペアンプ１９の出力はダイオード２２を介してフォトダイオード２６ｄのカソードに接続され、フォトダイオード２６ｄのアノードは抵抗２３を介して制御電源Ｖｃｃに接続される。フォトカプラ２６では、フォトダイオード２６ｄに流れる電流に応じて出力フォトトランジスタ２６ｔの出力状態が決定され、フォトトランジスタ２６ｔの出力が入力信号として制御ＩＣ２５に入力される。通常点灯時においては、オペアンプ１９は、出力電流（電流検出値）が目標値（基準電圧）に一致するようにスイッチング素子５のＰＷＭ制御におけるオン幅を決定することになる。なお、ダイオード２２の代わりに抵抗が接続されていてもよい。   The error amplification unit 610 includes an operational amplifier 19, resistors 20 and 21, diodes 22, resistors 23 and 24, and an input photodiode 26d of the photocoupler 26, and forms an error amplification circuit as a whole. The current detection value from the detection circuit 400 is input to the negative input terminal (−) of the operational amplifier 19, and the reference voltage is input to the positive input terminal (+) of the operational amplifier 19. This reference voltage corresponds to the target value of the output current and is determined by the divided value by the resistors 20 and 21 of the control power supply Vcc. A feedback element (not shown) (a resistor, a capacitor, or a series circuit or a parallel circuit thereof) is connected between the negative input terminal and the output terminal of the operational amplifier 19, and an error between the negative input terminal voltage and the positive input terminal voltage is detected at the output terminal. Is output. The output of the operational amplifier 19 is connected to the cathode of the photodiode 26d through the diode 22, and the anode of the photodiode 26d is connected to the control power supply Vcc through the resistor 23. In the photocoupler 26, the output state of the output phototransistor 26t is determined according to the current flowing through the photodiode 26d, and the output of the phototransistor 26t is input to the control IC 25 as an input signal. During normal lighting, the operational amplifier 19 determines the ON width in the PWM control of the switching element 5 so that the output current (current detection value) matches the target value (reference voltage). A resistor may be connected instead of the diode 22.

駆動制御部６２０は、制御ＩＣ２５及びその周辺回路（不図示）、フォトカプラ２６のフォトトランジスタ２６ｔ、及び起動抵抗２７を含む。制御ＩＣ２５は、一般的なＬＥＤドライバＩＣからなり、フォトトランジスタ２６ｔの出力状態に応じたパルス幅のＰＷＭ駆動信号を生成し、それをスイッチング素子５のゲート電圧として出力する。また、制御ＩＣ２５は、補助電源回路５００から制御電源が給電される前に起動抵抗２７を介して一次側回路の高電位側配線（ダイオードブリッジ３の共通カソード端）から給電され、動作を開始又は維持することができる。本実施形態では、制御ＩＣ２５及びその周辺回路は、フォトカプラ２６のフォトダイオード電流及びフォトトランジスタ電流の増加に対してＰＷＭ制御のオン幅が減少するように構成されるものとする。すなわち、制御信号の電圧の低下に応じて出力電流が低減される。なお、制御信号と制御ＩＣ２５への入力信号との論理は、制御ＩＣ２５の仕様に応じて適宜設定可能である。   The drive control unit 620 includes a control IC 25 and its peripheral circuits (not shown), a phototransistor 26 t of the photocoupler 26, and a starting resistor 27. The control IC 25 includes a general LED driver IC, generates a PWM drive signal having a pulse width corresponding to the output state of the phototransistor 26 t, and outputs it as the gate voltage of the switching element 5. Further, the control IC 25 is supplied with power from the high potential side wiring (common cathode end of the diode bridge 3) of the primary side circuit via the starting resistor 27 before the control power is supplied from the auxiliary power supply circuit 500, and starts the operation or Can be maintained. In the present embodiment, it is assumed that the control IC 25 and its peripheral circuits are configured such that the ON width of the PWM control decreases as the photodiode current and phototransistor current of the photocoupler 26 increase. That is, the output current is reduced as the voltage of the control signal decreases. The logic of the control signal and the input signal to the control IC 25 can be set as appropriate according to the specifications of the control IC 25.

例えば、図２に示すように、制御電源Ｖｓと一次側グランドＧ１の間に、抵抗２５ａ、フォトトランジスタ２６ｔ及び抵抗２５ｂが直列接続される構成が採用され得る。抵抗２５ａ及び２５ｂは、図１において不図示であった制御ＩＣ２５の周辺回路の一部である。図２に示す構成において、フォトトランジスタ２６ｔのコレクタ端子のレベルは、制御信号のレベルに対して実質的に単調増加し、フォトトランジスタ２６ｔのエミッタ端子のレベルは、制御信号のレベルに対して実質的に単調減少する。したがって、制御ＩＣ２５の仕様が、入力信号の低下に応じてＰＷＭオン幅を減少させるとともに下限閾値以下の入力信号に応じてゲート電圧の出力を停止させるものである場合には、フォトトランジスタ２６ｔのコレクタ端子の電圧が入力信号となる。一方、制御ＩＣ２５の仕様が、入力信号の上昇に応じてＰＷＭオン幅を減少させるとともに上限閾値以上の入力信号に応じてゲート電圧出力を停止させるものである場合には、フォトトランジスタ２６ｔのエミッタ端子の電圧が入力信号となる。なお、フォトトランジスタ２６ｔのコレクタ端子の電圧が制御ＩＣ２５の入力信号となる場合には、抵抗２５ｂを省略してフォトトランジスタ２６ｔのエミッタ端子を一次側グランドＧ１に直接接続してもよい。また、フォトトランジスタ２６ｔのエミッタ端子の電圧が制御ＩＣ２５の入力信号となる場合には、抵抗２５ａを省略してフォトトランジスタ２６ｔのコレクタ端子を制御電源Ｖｓに直接接続してもよい。   For example, as shown in FIG. 2, a configuration in which a resistor 25a, a phototransistor 26t, and a resistor 25b are connected in series between the control power supply Vs and the primary side ground G1 may be employed. The resistors 25a and 25b are part of a peripheral circuit of the control IC 25 (not shown in FIG. 1). In the configuration shown in FIG. 2, the collector terminal level of the phototransistor 26t substantially monotonically increases with respect to the control signal level, and the emitter terminal level of the phototransistor 26t substantially exceeds the control signal level. It decreases monotonously. Therefore, when the specification of the control IC 25 is such that the PWM ON width is decreased in response to a decrease in the input signal and the output of the gate voltage is stopped in response to the input signal below the lower limit threshold, the collector of the phototransistor 26t. The terminal voltage becomes the input signal. On the other hand, when the specification of the control IC 25 is such that the PWM ON width is decreased according to the rise of the input signal and the gate voltage output is stopped according to the input signal equal to or higher than the upper limit threshold, the emitter terminal of the phototransistor 26t. Is the input signal. When the voltage at the collector terminal of the phototransistor 26t becomes an input signal to the control IC 25, the resistor 25b may be omitted and the emitter terminal of the phototransistor 26t may be directly connected to the primary side ground G1. When the voltage at the emitter terminal of the phototransistor 26t becomes an input signal to the control IC 25, the resistor 25a may be omitted and the collector terminal of the phototransistor 26t may be directly connected to the control power supply Vs.

保護切換部６３０は、ツェナーダイオード２８、トランジスタ２９（例えばＭＯＳＦＥＴ）、抵抗３０及び３１並びにトランジスタ３２（例えばＭＯＳＦＥＴ）を含む。以下、トランジスタ２９及び３２を、必要に応じてそれぞれＦＥＴ２９及び３２という。ただし、トランジスタ２９及び３２は、バイポーラトランジスタ、抵抗内蔵型トランジスタ等であってもよい。ツェナーダイオード２８のカソードは検出回路４００の分圧抵抗１２の高電位端に接続され、アノードがＦＥＴ２９のゲート端子に接続される。ＦＥＴ２９のドレイン端子は抵抗３０と抵抗３１の接続点に接続され、ソース端子は二次側グランドＧ２に接続される。抵抗３０及び３１は制御電源Ｖｃｃの分圧回路であり、その分圧電圧がＦＥＴ３２のゲート端子に入力される。ＦＥＴ３２のドレイン端子はフォトダイオード２６ｄのカソードに接続され、ソース端子は二次側グランドＧ２に接続される。   The protection switching unit 630 includes a Zener diode 28, a transistor 29 (for example, a MOSFET), resistors 30 and 31, and a transistor 32 (for example, a MOSFET). Hereinafter, the transistors 29 and 32 are referred to as FETs 29 and 32, respectively, as necessary. However, the transistors 29 and 32 may be bipolar transistors, transistors with built-in resistors, or the like. The cathode of the Zener diode 28 is connected to the high potential end of the voltage dividing resistor 12 of the detection circuit 400, and the anode is connected to the gate terminal of the FET 29. The drain terminal of the FET 29 is connected to the connection point between the resistor 30 and the resistor 31, and the source terminal is connected to the secondary side ground G2. The resistors 30 and 31 are voltage dividing circuits for the control power supply Vcc, and the divided voltage is input to the gate terminal of the FET 32. The drain terminal of the FET 32 is connected to the cathode of the photodiode 26d, and the source terminal is connected to the secondary side ground G2.

ここで、ツェナーダイオード２８のツェナー電圧は、出力電圧が所定値以上の場合にツェナーダイオード２８及びＦＥＴ２９がオン状態となり、出力電圧が所定値未満の場合に少なくともＦＥＴ２９がオフ状態となるように、設定される。この所定値は、負荷短絡を検出するための閾値であり、出力電圧が所定値以上であれば通常（正常）点灯状態が検出され、出力電圧が所定値未満であれば負荷短絡状態が検出される。なお、上記所定値の分圧値がＦＥＴ２９のオン閾値に対応するように分圧抵抗１０〜１２の分圧比が設定される場合には、ツェナーダイオード２８は省略可能である。   Here, the Zener voltage of the Zener diode 28 is set so that the Zener diode 28 and the FET 29 are turned on when the output voltage is greater than or equal to a predetermined value, and at least the FET 29 is turned off when the output voltage is less than the predetermined value. Is done. This predetermined value is a threshold for detecting a load short circuit. If the output voltage is equal to or higher than the predetermined value, a normal (normal) lighting state is detected, and if the output voltage is less than the predetermined value, a load short circuit state is detected. The Note that the Zener diode 28 can be omitted when the voltage dividing ratio of the voltage dividing resistors 10 to 12 is set so that the predetermined divided voltage value corresponds to the ON threshold value of the FET 29.

出力電圧が所定値以上の場合には、ＦＥＴ２９がオン状態となり、ＦＥＴ３２のゲート−ソース電圧がゼロとなり、ＦＥＴ３２がオフ状態となる。ＦＥＴ３２がオフ状態となる場合には、制御信号生成部６１０によって決定されたフォトカプラ２６のフォトダイオード電流及びフォトトランジスタ電流に応じたオン幅でスイッチング素子５がＰＷＭ制御される。一方、出力電圧が所定値未満の場合には、ＦＥＴ２９がオフ状態となり、ＦＥＴ３２のゲート−ソース電圧が抵抗３０及び３１の分圧値となり、ＦＥＴ３２がオン状態となる。これにより、フォトダイオード２６ｄのカソード電位はゼロとなり、ダイオード２２はオフ状態となるとともに、フォトカプラ２６のフォトダイオード電流及びフォトトランジスタ電流が最大となる。なお、フォトダイオード電流及びフォトトランジスタ電流の最大値は抵抗２３の抵抗値によって決まる。   When the output voltage is equal to or higher than a predetermined value, the FET 29 is turned on, the gate-source voltage of the FET 32 is zero, and the FET 32 is turned off. When the FET 32 is turned off, the switching element 5 is PWM-controlled with an on width corresponding to the photodiode current and the phototransistor current of the photocoupler 26 determined by the control signal generation unit 610. On the other hand, when the output voltage is less than the predetermined value, the FET 29 is turned off, the gate-source voltage of the FET 32 becomes the divided value of the resistors 30 and 31, and the FET 32 is turned on. As a result, the cathode potential of the photodiode 26d becomes zero, the diode 22 is turned off, and the photodiode current and the phototransistor current of the photocoupler 26 are maximized. Note that the maximum values of the photodiode current and the phototransistor current are determined by the resistance value of the resistor 23.

したがって、通常点灯状態においては、出力電圧が所定値以上であるからＦＥＴ２９がオン状態となり、ＦＥＴ３２がオフ状態となり、制御信号生成部６１０によって生成される電圧範囲Ｖ１〜Ｖ２の制御信号がフォトカプラ２６を介して制御ＩＣ２５に入力される。これにより、オペアンプ１９の動作によって、出力電流（すなわちＬＥＤ電流）の定電流制御が実行される。下限値Ｖ１は、ダイオード２２の電圧降下量に相当し、最大電圧Ｖ２は制御電源Ｖｃｃの電圧に相当する（なお、ダイオード２２が省略される場合には、下限値Ｖ１はゼロとなる）。   Therefore, in the normal lighting state, since the output voltage is equal to or higher than the predetermined value, the FET 29 is turned on, the FET 32 is turned off, and the control signal in the voltage range V1 to V2 generated by the control signal generation unit 610 is the photocoupler 26. To the control IC 25. Thereby, the constant current control of the output current (that is, the LED current) is executed by the operation of the operational amplifier 19. The lower limit value V1 corresponds to the voltage drop amount of the diode 22, and the maximum voltage V2 corresponds to the voltage of the control power source Vcc (note that the lower limit value V1 is zero when the diode 22 is omitted).

一方、負荷短絡状態においては、出力電圧が所定値未満であるからＦＥＴ２９がオフ状態となり、ＦＥＴ３２がオン状態となり、制御信号の電圧は最小電圧Ｖ０＝ゼロに切り換えられる。これにより、オペアンプ１９による定電流制御は実行されなくなるとともに、フォトカプラ２６のフォトダイオード電流及びフォトトランジスタ電流が最大となる。制御ＩＣ２５は、最大のフォトトランジスタ電流に対応する信号が入力されるとスイッチング素子５の駆動を停止して直流電源回路３００の出力を停止するように構成される。直流電源回路３００の出力停止後においては、制御電源Ｖｓは生成されなくなるが、制御ＩＣ２５は起動抵抗２７を介した給電によってゲート電圧の出力停止状態をラッチするものとする。   On the other hand, in the load short-circuit state, since the output voltage is less than a predetermined value, the FET 29 is turned off, the FET 32 is turned on, and the voltage of the control signal is switched to the minimum voltage V0 = zero. Thereby, the constant current control by the operational amplifier 19 is not executed, and the photodiode current and the phototransistor current of the photocoupler 26 are maximized. The control IC 25 is configured to stop driving the switching element 5 and stop the output of the DC power supply circuit 300 when a signal corresponding to the maximum phototransistor current is input. After the output of the DC power supply circuit 300 is stopped, the control power supply Vs is not generated, but the control IC 25 latches the output stop state of the gate voltage by power feeding through the starting resistor 27.

このように、制御回路６００において、通常点灯時には、制御信号生成部６１０及び駆動制御部６２０によって、出力電流が目標値で一定となるように出力電流がフィードバック制御され、すなわち、定電流制御が行われる。この定電流制御は、通常点灯時に安定した出力電流制御を与えるとともに出力電圧を安定させ、負荷短絡発生の検出精度向上にも貢献する。そして、負荷短絡時には、保護切換部６３０及び駆動制御部６２０によって、負荷短絡時に出力電流が停止され、保護動作が実行される。   As described above, in the control circuit 600, during normal lighting, the control signal generation unit 610 and the drive control unit 620 perform feedback control of the output current so that the output current becomes constant at the target value, that is, constant current control is performed. Is called. This constant current control provides stable output current control during normal lighting, stabilizes the output voltage, and contributes to improved detection accuracy of load short-circuit occurrence. When the load is short-circuited, the protection switching unit 630 and the drive control unit 620 stop the output current when the load is short-circuited, and the protection operation is performed.

また、制御信号生成部６１０によって生成される制御信号の電圧範囲の下限値Ｖ１と、保護切換部６３０によって切り換えられる制御信号の最小電圧Ｖ０について、Ｖ０＜Ｖ１となる。これにより、所定電圧範囲Ｖ１〜Ｖ２の制御信号による通常点灯動作の構成と、最小電圧Ｖ０の制御信号による保護動作の構成とを独立して設定することができ、制御回路６００の設計の自由度が増す。   Further, the lower limit value V1 of the voltage range of the control signal generated by the control signal generation unit 610 and the minimum voltage V0 of the control signal switched by the protection switching unit 630 are V0 <V1. Thereby, the configuration of the normal lighting operation by the control signal of the predetermined voltage range V1 to V2 and the configuration of the protection operation by the control signal of the minimum voltage V0 can be set independently, and the degree of freedom in designing the control circuit 600 Increase.

以上のように、本実施形態のＬＥＤ点灯回路１００は、ＬＥＤ７０に直流電流を供給する直流電源回路３００、少なくとも出力電圧を検出する検出回路４００、及び直流電源回路３００を制御する制御回路６００を備え、制御回路６００は、所定電圧範囲Ｖ１〜Ｖ２の制御信号を生成する制御信号生成部６１０、制御信号電圧の低下に対して出力電流が低減されるように直流電源回路３００を駆動する駆動制御部６２０、及び検出回路４００によって検出される出力電圧が所定値未満となる場合に制御信号を所定電圧範囲Ｖ１〜Ｖ２の下限値Ｖ１以下の最小電圧Ｖ０に切り換える保護切換部６３０を有する。このように、制御信号の低下に対して出力電流が低減される構成において、負荷短絡が発生して出力電圧が所定値未満となる場合に制御信号が最小電圧Ｖ０に切り換えられるように構成される。したがって、負荷短絡故障時に直流電源回路３００の出力が停止され、不要な回路電流を発生させずに適切な保護動作を行うことが可能となる。また、保護動作が、直流電源回路３００の出力動作の制御によって実現されるので、出力電流及び出力電圧の経路に追加のスイッチング素子又は限流素子が不要となり、通常点灯時及び保護動作時の回路効率を損なうことなく、高効率かつ簡素な回路構成で保護動作が実現される。   As described above, the LED lighting circuit 100 according to this embodiment includes the DC power supply circuit 300 that supplies a direct current to the LED 70, the detection circuit 400 that detects at least the output voltage, and the control circuit 600 that controls the DC power supply circuit 300. The control circuit 600 includes a control signal generation unit 610 that generates a control signal in a predetermined voltage range V1 to V2, and a drive control unit that drives the DC power supply circuit 300 so that the output current is reduced in response to a decrease in the control signal voltage. 620, and a protection switching unit 630 that switches the control signal to the minimum voltage V0 that is not more than the lower limit value V1 of the predetermined voltage range V1 to V2 when the output voltage detected by the detection circuit 400 is less than the predetermined value. Thus, in the configuration in which the output current is reduced with respect to the decrease in the control signal, the control signal is switched to the minimum voltage V0 when a load short circuit occurs and the output voltage becomes less than a predetermined value. . Therefore, the output of the DC power supply circuit 300 is stopped at the time of a load short-circuit failure, and an appropriate protection operation can be performed without generating unnecessary circuit current. Further, since the protective operation is realized by controlling the output operation of the DC power supply circuit 300, no additional switching element or current limiting element is required in the path of the output current and the output voltage, and the circuit at the time of normal lighting and the protective operation The protection operation is realized with a highly efficient and simple circuit configuration without impairing the efficiency.

また、ＬＥＤ照明装置１５０は、筐体に収容されたＬＥＤ点灯回路１００と、ＬＥＤ７０が実装され、ＬＥＤ点灯回路１００に配線接続されたＬＥＤユニット７００とを備える。これにより、負荷短絡故障後も、負荷の修理又は交換によってＬＥＤ照明装置１５０の使用を継続することができ、保守コストが低減される。   The LED lighting device 150 includes an LED lighting circuit 100 housed in a casing, and an LED unit 700 on which the LED 70 is mounted and connected to the LED lighting circuit 100 by wiring. Thereby, even after a load short-circuit failure, the use of the LED lighting device 150 can be continued by repairing or replacing the load, and the maintenance cost is reduced.

＜第２の実施形態＞
上記第１の実施形態では、負荷短絡故障時に直流電源回路３００の出力電流が停止される構成を示したが、本実施形態では、負荷短絡故障時に直流電源回路３００の出力電流が最小化されるとともに負荷短絡故障がユーザに報知される構成を示す。 <Second Embodiment>
In the first embodiment, the configuration is shown in which the output current of the DC power supply circuit 300 is stopped when the load short-circuit failure occurs. However, in this embodiment, the output current of the DC power supply circuit 300 is minimized when the load short-circuit failure occurs. In addition, a configuration in which a load short circuit failure is notified to the user is shown.

図３に、本実施形態によるＬＥＤ点灯回路１００及びそれを用いたＬＥＤ照明装置１５０を示す。本実施形態と第１の実施形態とは、制御回路６００の保護切換部６３０の構成が異なり、他の構成は同様である。したがって、本実施形態において、第１の実施形態と同様の構成には同様の符号を付し、重複する説明を省略する。   FIG. 3 shows the LED lighting circuit 100 according to the present embodiment and the LED lighting device 150 using the same. This embodiment is different from the first embodiment in the configuration of the protection switching unit 630 of the control circuit 600, and the other configurations are the same. Therefore, in this embodiment, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and the overlapping description is abbreviate | omitted.

制御回路６００の保護切換部６３０は、ツェナーダイオード２８、ＦＥＴ２９、抵抗３０及び３１、ＦＥＴ３２、並びにＬＥＤ４０を含む。ＬＥＤ４０は、報知用の発光素子であり、ＦＥＴ３２のゲート端子と二次側グランドＧ２の間において抵抗３１と直列接続される。ただし、ＬＥＤ４０は、ＦＥＴ２９のドレイン端子と二次側グランドＧ２の間に接続されていれば、他の箇所に接続されていてもよい。例えば、ＦＥＴ２９のドレイン端子と抵抗３０の接続点と、ＦＥＴ３２のゲート端子と抵抗３１の接続点との間に挿入接続されていてもよい。また、複数のＬＥＤ４０が、その順方向電圧がＦＥＴ３２のオン閾値を超えるようにしてＦＥＴ３２のゲート−ソース間に接続されていてもよい（この場合、抵抗３１は不要である）。いずれの場合であっても、ＬＥＤ４０は、ＦＥＴ２９がオフすることによって制御信号が最小電圧Ｖ０に切り換えられた状態において通電されて発光する。   The protection switching unit 630 of the control circuit 600 includes a Zener diode 28, FET 29, resistors 30 and 31, FET 32, and LED 40. The LED 40 is a light emitting element for notification, and is connected in series with the resistor 31 between the gate terminal of the FET 32 and the secondary side ground G2. However, the LED 40 may be connected to another location as long as it is connected between the drain terminal of the FET 29 and the secondary side ground G2. For example, it may be inserted and connected between the connection point of the drain terminal of the FET 29 and the resistor 30 and the connection point of the gate terminal of the FET 32 and the resistor 31. Further, the plurality of LEDs 40 may be connected between the gate and the source of the FET 32 such that the forward voltage thereof exceeds the ON threshold value of the FET 32 (in this case, the resistor 31 is not necessary). In any case, the LED 40 is energized and emits light when the control signal is switched to the minimum voltage V0 by turning off the FET 29.

通常点灯状態における動作は第１の実施形態と同様である。すなわち、ＦＥＴ２９がオン状態となり、ＦＥＴ３２がオフ状態となり、制御信号生成部６１０によって生成される電圧範囲Ｖ１〜Ｖ２の制御信号が駆動制御部６２０に入力される。これにより、オペアンプ１９の動作によって、出力電流（すなわちＬＥＤ電流）の定電流制御が実行される。通常点灯状態においては、ＦＥＴ２９がオン状態であるので、ＬＥＤ４０は通電されず、発光しない。   The operation in the normal lighting state is the same as that in the first embodiment. That is, the FET 29 is turned on, the FET 32 is turned off, and the control signal in the voltage range V1 to V2 generated by the control signal generation unit 610 is input to the drive control unit 620. Thereby, the constant current control of the output current (that is, the LED current) is executed by the operation of the operational amplifier 19. In the normal lighting state, since the FET 29 is on, the LED 40 is not energized and does not emit light.

一方、負荷短絡状態においては、ＦＥＴ２９がオフ状態となり、ＦＥＴ３２がオン状態となり、制御信号の電圧は最小電圧Ｖ０＝ゼロに切り換えられる。ＦＥＴ２９がオフ状態となることにより、制御電源Ｖｃｃから抵抗３０及び３１を介してＬＥＤ４０が通電され、発光する。   On the other hand, in the load short-circuit state, the FET 29 is turned off, the FET 32 is turned on, and the voltage of the control signal is switched to the minimum voltage V0 = zero. When the FET 29 is turned off, the LED 40 is energized from the control power supply Vcc via the resistors 30 and 31 to emit light.

また、この保護動作によってオペアンプ１９による定電流制御は実行されなくなり、フォトカプラ２６のフォトダイオード電流及びフォトトランジスタ電流は最大となる。本実施形態では、制御ＩＣ２５は、最大のフォトトランジスタ電流に対応する入力信号が入力されるとスイッチング素子５の駆動を最小化し、直流電源回路３００の出力を最小化させるように構成される。この最小出力状態は、スイッチング素子５の最小オン幅による駆動又は間欠駆動によって制御電源Ｖｓ及びＶｃｃが生成される最小限の動作状態である。したがって、保護動作状態において、制御回路６００の動作が継続され、ＬＥＤ４０の点灯が継続される。なお、ＬＥＤ７０の一部短絡状態において最小出力状態が実行される場合には、出力電圧が残存ＬＥＤ７０の順方向電圧以上の場合には残存ＬＥＤ７０が減光点灯され、出力電圧が残存ＬＥＤの順方向電圧未満の場合には残存ＬＥＤ７０は消灯される。   In addition, the constant current control by the operational amplifier 19 is not executed by this protection operation, and the photodiode current and the phototransistor current of the photocoupler 26 are maximized. In the present embodiment, the control IC 25 is configured to minimize the driving of the switching element 5 and the output of the DC power supply circuit 300 when an input signal corresponding to the maximum phototransistor current is input. This minimum output state is a minimum operation state in which the control power sources Vs and Vcc are generated by driving with the minimum ON width of the switching element 5 or intermittent driving. Therefore, in the protection operation state, the operation of the control circuit 600 is continued and the lighting of the LED 40 is continued. When the minimum output state is executed when the LED 70 is partially short-circuited, if the output voltage is equal to or greater than the forward voltage of the remaining LED 70, the remaining LED 70 is dimmed and the output voltage is forward of the remaining LED. When the voltage is less than the voltage, the remaining LED 70 is turned off.

なお、ＬＥＤ４０の発光色はＬＥＤ７０の発光色と異なっていることが好ましい。これにより、ユーザは、ＬＥＤ４０の発光が通常点灯動作によるものではなく、保護動作に起因する報知動作であることを容易に認識することができる。また、ＬＥＤ４０の照射位置（配光）がＬＥＤ７０と異なるものであってもよい。これによっても、ユーザはＬＥＤ４０による報知動作をＬＥＤ７０による通常点灯動作と区別して認識することができる。   In addition, it is preferable that the luminescent color of LED40 differs from the luminescent color of LED70. Thereby, the user can easily recognize that the light emission of the LED 40 is not a normal lighting operation but a notification operation caused by the protection operation. Moreover, the irradiation position (light distribution) of LED40 may differ from LED70. Also by this, the user can recognize the notification operation by the LED 40 separately from the normal lighting operation by the LED 70.

以上のように、本実施形態のＬＥＤ点灯回路１００の制御回路６００は、制御信号が最小電圧Ｖ０に切り換えられた状態において通電されるように接続されたＬＥＤ４０を更に備える。これにより、負荷短絡時に直流電源回路３００の出力が最小化されつつ報知用のＬＥＤ４０が発光する。このように、負荷短絡故障時に、必要以上の不要な回路電流を発生させずに適切な保護動作を行うことが可能となる。また、第１の実施形態と同様に、通常点灯時及び保護動作時の回路効率を損なうことなく、高効率かつ簡素な回路構成で保護動作が実現される。さらに、ＬＥＤ４０の発光により、ユーザは、負荷短絡故障が発生していることを認識することができ、保守の機会を図ることができる。   As described above, the control circuit 600 of the LED lighting circuit 100 according to the present embodiment further includes the LED 40 connected to be energized in a state where the control signal is switched to the minimum voltage V0. Thereby, the LED 40 for notification emits light while the output of the DC power supply circuit 300 is minimized when the load is short-circuited. As described above, it is possible to perform an appropriate protection operation without generating an unnecessary circuit current more than necessary when a load short circuit failure occurs. Further, similarly to the first embodiment, the protection operation is realized with a highly efficient and simple circuit configuration without impairing the circuit efficiency during normal lighting and protection operation. Further, the light emission of the LED 40 allows the user to recognize that a load short-circuit failure has occurred and to provide an opportunity for maintenance.

＜変形例＞
以上に本発明の好適な実施形態を示したが、本発明は、例えば以下に示すように種々の態様に変形可能である。 <Modification>
Although preferred embodiments of the present invention have been described above, the present invention can be modified into various modes as shown below, for example.

例えば、上記各実施形態では、制御信号生成部６１０がオペアンプ１９等を含む誤差増幅回路を形成して定電流制御が行われる構成を示したが、制御信号生成部６１０が定電流制御を行わない構成も可能である。図４に、本変形例の制御回路６００を示す。本変形例において、第１の実施形態と同様の構成には同様の符号を付し、重複する説明を省略する。制御信号生成部６１０は、抵抗２３及び２４並びにフォトダイオード２６ｄを含む。なお、本変形例では、出力電流のフィードバック制御は行われないので、検出回路４００の電流検出抵抗１３は不要となる。   For example, in each of the above embodiments, the control signal generation unit 610 forms an error amplifier circuit including the operational amplifier 19 and the like, and the constant current control is performed. However, the control signal generation unit 610 does not perform the constant current control. Configuration is also possible. FIG. 4 shows a control circuit 600 of this modification. In this modification, the same reference numerals are given to the same components as those in the first embodiment, and the duplicate description will be omitted. The control signal generation unit 610 includes resistors 23 and 24 and a photodiode 26d. In the present modification, the feedback control of the output current is not performed, so that the current detection resistor 13 of the detection circuit 400 is not necessary.

出力電圧が所定値以上の場合（通常点灯時）には、ＦＥＴ２９がオン状態となり、ＦＥＴ３２がオフ状態となり、制御信号は実質的に制御電源Ｖｃｃの電圧となる。すなわち、制御信号の電圧下限値Ｖ１は制御電源Ｖｃｃの電圧となる。これにより、フォトカプラ２６においては、フォトダイオード電流及びフォトトランジスタ電流は発生せず、制御ＩＣ２５は、その周辺回路の抵抗値等で決まる所定のオン幅でスイッチング素子５をＰＷＭ駆動する。   When the output voltage is equal to or higher than a predetermined value (normally on), the FET 29 is turned on, the FET 32 is turned off, and the control signal is substantially the voltage of the control power supply Vcc. That is, the voltage lower limit value V1 of the control signal is the voltage of the control power supply Vcc. As a result, no photo diode current or photo transistor current is generated in the photocoupler 26, and the control IC 25 PWM drives the switching element 5 with a predetermined on-width determined by the resistance value of the peripheral circuit.

出力電圧が所定値未満の場合（負荷短絡が検出された保護動作時）の動作は第１の実施形態と同様である。すなわち、ＦＥＴ２９がオフ状態となり、ＦＥＴ３２がオン状態となり、制御信号の電圧が最小電圧Ｖ０＝ゼロに切り換えられる。これにより、制御ＩＣ２５は、最大のフォトトランジスタ電流に応じてスイッチング素子５の駆動を停止させて直流電源回路３００の出力を停止させる。本変形例においても、直流電源回路３００の出力停止後においては、制御ＩＣ２５は起動抵抗２７からの給電によってゲート電圧の出力停止状態をラッチするものとする。   The operation when the output voltage is less than a predetermined value (during a protective operation in which a load short circuit is detected) is the same as that in the first embodiment. That is, the FET 29 is turned off, the FET 32 is turned on, and the voltage of the control signal is switched to the minimum voltage V0 = zero. As a result, the control IC 25 stops the driving of the switching element 5 according to the maximum phototransistor current and stops the output of the DC power supply circuit 300. Also in this modification, after the output of the DC power supply circuit 300 is stopped, the control IC 25 latches the output stop state of the gate voltage by the power supply from the starting resistor 27.

なお、本変形例は第２の実施形態にも同様に適用可能であり、この場合、ＬＥＤ４０と、ＦＥＴ２９、抵抗３０及び３１並びにＦＥＴ３２との接続関係は第２の実施形態のものと同様である。そして、制御信号の電圧が最小電圧Ｖ０＝ゼロに切り換えられると、制御ＩＣ２５は、最大のフォトトランジスタ電流に応じてスイッチング素子５の駆動を最小化させて直流電源回路３００の最小出力状態を維持する。これにより制御電源Ｖｃｃが確保され、報知用のＬＥＤ４０が発光する。   This modification can be applied to the second embodiment in the same manner. In this case, the connection relationship between the LED 40 and the FET 29, resistors 30 and 31, and FET 32 is the same as that of the second embodiment. . When the voltage of the control signal is switched to the minimum voltage V0 = zero, the control IC 25 minimizes the driving of the switching element 5 according to the maximum phototransistor current and maintains the minimum output state of the DC power supply circuit 300. . As a result, the control power supply Vcc is secured and the notification LED 40 emits light.

４０、７０ ＬＥＤ
１００ ＬＥＤ点灯回路
１５０ ＬＥＤ照明装置
３００ 直流電源回路
４００ 検出回路
６００ 制御回路
６１０ 制御信号生成部
６２０ 駆動制御部
６３０ 保護切換部
７００ ＬＥＤユニット
40, 70 LED
100 LED lighting circuit 150 LED lighting device 300 DC power supply circuit 400 detection circuit 600 control circuit 610 control signal generation unit 620 drive control unit 630 protection switching unit 700 LED unit

Claims (6)

ＬＥＤ点灯回路であって、
ＬＥＤに直流電流を供給する直流電源回路と、
前記直流電源回路の少なくとも出力電圧を検出する検出回路と、
所定電圧範囲の制御信号を生成する制御信号生成部、前記制御信号の電圧の低下に対して前記出力電流が低減されるように前記直流電源回路を駆動制御する駆動制御部、及び前記検出回路によって検出される出力電圧が所定値未満となる場合に前記制御信号を前記所定電圧範囲の下限値以下の最小電圧に切り換える保護切換部を有する制御回路と
を備えたＬＥＤ点灯回路。 An LED lighting circuit,
A DC power supply circuit for supplying a direct current to the LED;
A detection circuit for detecting at least an output voltage of the DC power supply circuit;
A control signal generation unit that generates a control signal in a predetermined voltage range, a drive control unit that drives and controls the DC power supply circuit so that the output current is reduced in response to a decrease in the voltage of the control signal, and the detection circuit An LED lighting circuit comprising: a control circuit having a protection switching unit that switches the control signal to a minimum voltage not more than a lower limit value of the predetermined voltage range when the detected output voltage is less than a predetermined value. 請求項１に記載のＬＥＤ点灯回路において、
前記検出回路が前記直流電源回路の出力電流を更に検出するように構成され、
前記制御信号生成部が、前記検出回路によって検出された出力電流と目標値との誤差を増幅することによって前記所定電圧範囲の制御信号を生成する誤差増幅回路を形成する、ＬＥＤ点灯回路。 In the LED lighting circuit according to claim 1,
The detection circuit is configured to further detect an output current of the DC power supply circuit;
The LED lighting circuit, wherein the control signal generation unit forms an error amplification circuit that generates a control signal in the predetermined voltage range by amplifying an error between an output current detected by the detection circuit and a target value. 請求項１又は２に記載のＬＥＤ点灯回路において、前記最小電圧が前記所定電圧範囲の下限値未満の電圧である、ＬＥＤ点灯回路。   3. The LED lighting circuit according to claim 1, wherein the minimum voltage is a voltage less than a lower limit value of the predetermined voltage range. 請求項１から３のいずれか一項に記載のＬＥＤ点灯回路において、前記制御回路がさらに、前記制御信号が前記最小電圧に切り換えられた状態において通電されて発光するように接続された発光素子を備える、ＬＥＤ点灯回路。   4. The LED lighting circuit according to claim 1, wherein the control circuit further includes a light emitting element connected to emit light when the control signal is switched to the minimum voltage. An LED lighting circuit provided. 請求項１から４のいずれか一項に記載のＬＥＤ点灯回路において、
前記直流電源回路が、スイッチング素子を有する入力側の一次側回路及び該一次側回路から絶縁されて前記ＬＥＤが接続される二次側回路を有するフライバックコンバータからなり、
前記駆動制御部が前記一次側回路と同じ基準電位に対して動作し、前記検出回路、前記制御信号生成部及び前記保護切換部が前記二次側回路と同じ基準電位に対して動作し、前記制御信号がフォトカプラを介して前記一次側回路から前記二次側回路に入力され、前記制御信号の電圧の低下に応じて前記フォトカプラのフォトダイオード電流及びフォトトランジスタ電流が増加するように構成され、前記駆動制御部が前記フォトトランジスタ電流の増加に応じて前記スイッチング素子のＰＷＭ駆動におけるオン幅を減少させ、又は前記ＰＷＭ駆動を停止させるように構成された、ＬＥＤ点灯回路。 In the LED lighting circuit according to any one of claims 1 to 4,
The DC power supply circuit comprises a primary circuit on the input side having a switching element and a flyback converter having a secondary circuit that is insulated from the primary circuit and connected to the LED,
The drive control unit operates with respect to the same reference potential as the primary side circuit, and the detection circuit, the control signal generation unit, and the protection switching unit operate with respect to the same reference potential as the secondary side circuit, A control signal is input from the primary side circuit to the secondary side circuit via a photocoupler, and the photodiode current and the phototransistor current of the photocoupler increase in response to a decrease in the voltage of the control signal. The LED lighting circuit, wherein the drive control unit is configured to decrease an ON width in PWM driving of the switching element or stop the PWM driving in accordance with an increase in the phototransistor current. 筐体に収容された請求項１から５のいずれか一項に記載のＬＥＤ点灯回路と、
前記ＬＥＤが実装され、前記ＬＥＤ点灯回路に対して着脱可能なＬＥＤユニットと
を備えたＬＥＤ照明装置。

The LED lighting circuit according to any one of claims 1 to 5 housed in a housing;
An LED lighting device comprising: an LED unit mounted with the LED and detachable from the LED lighting circuit.

JP2015133547A 2015-07-02 2015-07-02 LED lighting circuit and LED lighting device Active JP6550977B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015133547A JP6550977B2 (en) 2015-07-02 2015-07-02 LED lighting circuit and LED lighting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015133547A JP6550977B2 (en) 2015-07-02 2015-07-02 LED lighting circuit and LED lighting device

Publications (2)

Publication Number Publication Date
JP2017016919A true JP2017016919A (en) 2017-01-19
JP6550977B2 JP6550977B2 (en) 2019-07-31

Family

ID=57831014

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2015133547A Active JP6550977B2 (en) 2015-07-02 2015-07-02 LED lighting circuit and LED lighting device

Country Status (1)

Country Link
JP (1) JP6550977B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107072011A (en) * 2017-05-22 2017-08-18 南京泰杰赛智能科技有限公司 A kind of intelligent illuminating switch controller with loop electric parameter measurement
WO2020183935A1 (en) * 2019-03-13 2020-09-17 ソニーセミコンダクタソリューションズ株式会社 Malfunction detection device, light emission driving device, and light emission device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015002104A (en) * 2013-06-17 2015-01-05 岩崎電気株式会社 Led lighting circuit and led illuminating device
JP2015018916A (en) * 2013-07-10 2015-01-29 パナソニックＩｐマネジメント株式会社 Light-emitting diode driving device, lighting fixture for vehicle and vehicle including the same
JP2015041571A (en) * 2013-08-23 2015-03-02 岩崎電気株式会社 Led power supply and led illuminating device
JP2015053228A (en) * 2013-09-09 2015-03-19 岩崎電気株式会社 Led lighting device and led illuminating device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015002104A (en) * 2013-06-17 2015-01-05 岩崎電気株式会社 Led lighting circuit and led illuminating device
JP2015018916A (en) * 2013-07-10 2015-01-29 パナソニックＩｐマネジメント株式会社 Light-emitting diode driving device, lighting fixture for vehicle and vehicle including the same
JP2015041571A (en) * 2013-08-23 2015-03-02 岩崎電気株式会社 Led power supply and led illuminating device
JP2015053228A (en) * 2013-09-09 2015-03-19 岩崎電気株式会社 Led lighting device and led illuminating device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107072011A (en) * 2017-05-22 2017-08-18 南京泰杰赛智能科技有限公司 A kind of intelligent illuminating switch controller with loop electric parameter measurement
WO2020183935A1 (en) * 2019-03-13 2020-09-17 ソニーセミコンダクタソリューションズ株式会社 Malfunction detection device, light emission driving device, and light emission device
US11564305B2 (en) 2019-03-13 2023-01-24 Sony Semiconductor Solutions Corporation Malfunction detection device, light-emission driving device, and light emitting device

Also Published As

Publication number Publication date
JP6550977B2 (en) 2019-07-31

Similar Documents

Publication Publication Date Title
JP5052590B2 (en) Power supply circuit and lighting device
JP5435912B2 (en) Power supply device and lighting device
JP6421047B2 (en) Switching power supply
JP6171724B2 (en) LED power supply device and LED lighting device
JP4013162B2 (en) Switching power supply
JP6245433B2 (en) LED power supply device and LED lighting device
JP6273894B2 (en) LED lighting device and LED lighting device
KR20120080907A (en) Light emitting diode emitting device
JP6249167B2 (en) LED lighting device and LED lighting device
JP6187024B2 (en) LED power supply device and LED lighting device
JP2010097880A (en) Light-emitting diode lighting device
JP6332629B2 (en) LED power supply and LED lighting device
JP6550977B2 (en) LED lighting circuit and LED lighting device
JP6171754B2 (en) LED lighting device and LED lighting device
JP6186918B2 (en) LED lighting circuit and LED lighting device
US8492993B2 (en) LED driving circuit and power converting circuit
JP6922550B2 (en) LED lighting device and LED lighting device
KR101568855B1 (en) Led convertor lc feedback stabilization circuit
JP5129208B2 (en) Switching power supply
JP6344086B2 (en) Control device
US10897192B1 (en) Scheme to reduce static power consumption in analog controller based power converters requiring an external high voltage startup circuit
JP2018160384A (en) Led lighting device and led illuminating device
JP6282147B2 (en) LED power supply device and LED lighting device
JP2017123261A (en) Power supply device for led and led lighting device
JP6569344B2 (en) LED lighting circuit and LED lighting device

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20180515

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20190319

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20190320

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20190402

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20190604

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20190617

R150 Certificate of patent or registration of utility model

Ref document number: 6550977

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

S531 Written request for registration of change of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313531

R371 Transfer withdrawn

Free format text: JAPANESE INTERMEDIATE CODE: R371

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350