WO2013042673A1 - Circuit d'éclairage à del - Google Patents

Circuit d'éclairage à del Download PDF

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Publication number
WO2013042673A1
WO2013042673A1 PCT/JP2012/073879 JP2012073879W WO2013042673A1 WO 2013042673 A1 WO2013042673 A1 WO 2013042673A1 JP 2012073879 W JP2012073879 W JP 2012073879W WO 2013042673 A1 WO2013042673 A1 WO 2013042673A1
Authority
WO
WIPO (PCT)
Prior art keywords
input voltage
led
led lighting
winding
output
Prior art date
Application number
PCT/JP2012/073879
Other languages
English (en)
Japanese (ja)
Inventor
研吾 木村
Original Assignee
サンケン電気株式会社
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 サンケン電気株式会社 filed Critical サンケン電気株式会社
Publication of WO2013042673A1 publication Critical patent/WO2013042673A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • 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
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • 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]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/26—Circuit arrangements for protecting against earth faults
    • 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
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to an insulated LED lighting circuit that lights an LED (Light Emitting Diode) as a light source.
  • LED Light Emitting Diode
  • LEDs have come to be used as light sources for general lighting devices for home use and the like, not only in the form corresponding to fluorescent lamps such as straight tube type and ring type, but also in the light bulb type corresponding to incandescent bulbs. Lighting devices have been manufactured. Further, in general, lighting devices that can be touched relatively easily by humans are required to have safety such as prevention of electric shock. Therefore, the LED lighting circuit includes a commercial power source and a load (LED ) And a transformer that is electrically insulated from each other.
  • Patent Document 1 discloses an insulated LED lighting circuit including a transformer as described above.
  • the conventional LED lighting device 300 described in Patent Document 1 includes an LED driving device 201 and an LED 202.
  • the LED driving device 201 includes an input capacitor 211, a transformer 212, a MOSFET 213, a controller 219, and an output capacitor 220. Further, the LED driving device 201 includes an error amplifier 215, a diode 216, and a photocoupler 217.
  • the error amplifier 215 of the conventional LED lighting device 300 performs a calculation based on the voltage generated in the current detection resistor 218 and the voltage value of the reference voltage source, and feeds back the calculation result to the controller 219 via the photocoupler 217.
  • the LED driving device 201 controls the current flowing through the LED 202 to be constant.
  • the present invention provides an LED lighting circuit that can be handled safely by quickly reducing the output voltage when the input voltage from a commercial power source or the like is lost.
  • an LED lighting circuit that converts an input voltage into a desired DC voltage and supplies the LED to an LED, the transformer having at least a primary winding and a secondary winding, a switching element, and a control A transformer, an output capacitor, an input voltage detector, and a discharger, wherein the transformer receives the input voltage at one end of the primary winding, and the direct current is applied to the LED through the secondary winding.
  • a voltage is supplied, and the switching element is connected to the other end of the primary winding and performs a switching operation according to a control signal output from the controller, and the output capacitor is connected to both ends of the secondary winding.
  • the input voltage detector detects the input voltage and outputs a discharge signal corresponding to the detected height of the input voltage to the discharger, and the discharger is connected to both ends of the output capacitor. Connected To discharge the charge stored in the output capacitor in response to the discharge signal output from the input voltage detector.
  • FIG. 1 is a circuit diagram showing a configuration of an LED lighting circuit according to an embodiment of the present invention.
  • the LED lighting circuit 1 according to the present embodiment includes a transformer 11 having at least a primary winding W1 and a secondary winding W2, a switching element 12, a controller 13, an output capacitor 14, an input voltage detector 15, And a discharger 16.
  • the LED lighting circuit 1 includes an insulated power conversion circuit that converts an input voltage into a desired DC voltage and outputs the converted voltage.
  • the LED 2 includes at least one LED element, and includes a series connection package and a parallel connection package including a plurality of LED elements, or a combination thereof.
  • the input power source 3 is composed of a power source that outputs a DC input voltage, and may be composed of a DC power source such as a battery, or may be composed of a combination of an AC power source such as a commercial power source and a rectifying and smoothing circuit.
  • the LED lighting circuit 1, LED 2, and input power source 3 are connected to each other, and the LED lighting circuit 1 and LED 2 constitute the LED lighting device 100 according to this embodiment.
  • black dots added to the primary winding W1 and the secondary winding W2 of the transformer 11 indicate the polarity of the transformer.
  • the primary winding W1 and the secondary winding W2 are wound in opposite polarities so that the secondary winding W2 becomes a flyback output winding.
  • the primary winding W1 of the transformer 11 is connected to the input power supply 3, and the secondary winding W2 of the transformer 11 is connected to the LED2.
  • the transformer 11 receives an input voltage from the input power source 3 at one end (positive side) of the primary winding W1, and supplies a DC voltage to the LED 2 connected to both ends of the secondary winding W2.
  • the switching element 12 is composed of a MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor).
  • MOSFET Metal-Oxide-Semiconductor Field Effect Transistor
  • the drain of the switching element 12 is connected to the other end (negative electrode side) of the primary winding W1 of the transformer 11, the source of the switching element 12 is connected to the primary side ground, and the gate of the switching element 12 is connected to the controller 13.
  • the switching element 12 performs a switching operation (on / off operation) in accordance with a high-level or low-level control signal output from the controller 13, and conducts or cuts off a current flowing from the input power source 3 to the primary winding W1.
  • An AC voltage is generated in the secondary winding W2 by the switching operation of the switching element 12.
  • the output capacitor 14 is composed of an electrolytic capacitor or a ceramic capacitor, is connected to both ends of the secondary winding W2, and is equivalently connected in parallel to the LED2. One end of the output capacitor 14 is connected to one end (negative electrode side) of the secondary winding W2 via the diode 17, and the other end of the output capacitor 14 is connected to the other end (positive electrode side) of the secondary winding W2 and the secondary side ground. Connected to.
  • the output capacitor 14 and the diode 17 constitute a rectifying / smoothing circuit, and convert an AC voltage generated in the secondary winding W2 to be supplied to the LED 2 into a DC voltage.
  • the input voltage detector 15 is connected to the discharger 16, detects the input voltage output from the input power supply 3, and outputs a discharge signal corresponding to the level of the input voltage to the discharger 16.
  • the input voltage detector 15 is configured to detect that at least the LED lighting circuit 1 is disconnected from the input power supply 3 and the input voltage is lost, and to allow the discharger 16 to perform a discharging operation when the input voltage is lost. .
  • the discharger 16 is a well-known switch that can connect and disconnect between two terminals, and is connected to both ends of the output capacitor 14.
  • the discharger 16 operates in response to the discharge signal output from the input voltage detector 15, and discharges the charge stored in the output capacitor 14 when the LED lighting circuit 1 is disconnected from the input power supply 3 and the input voltage is lost. To do.
  • FIG. 2 is a circuit diagram showing a detailed configuration of the LED lighting circuit according to the embodiment of the present invention.
  • the LED lighting circuit 1 according to the present embodiment further includes a feedback circuit 18 and an auxiliary power source 19.
  • the LED 2 includes an LED string in which a plurality of LED elements are connected in series, and the input power source 3 includes a rectifying and smoothing circuit including a diode bridge 32 and a capacitor 33 and a commercial power source 31.
  • the transformer 11 further includes a tertiary winding W3 and an auxiliary winding Wa, and one end (positive side) of the primary winding W1 is connected to one end of a capacitor 33 that is an output end of the rectifying and smoothing circuit.
  • the tertiary winding W3 is a forward output winding different from the secondary winding W2, and the auxiliary winding is a flyback output winding.
  • One end (negative electrode side) of the tertiary winding W3 is connected to the secondary side ground, and the other end (positive electrode side) is connected to the anode of the diode 151 of the input voltage detector 15.
  • auxiliary winding Wa One end (negative electrode side) of the auxiliary winding Wa is connected to the controller 13 via a rectifying and smoothing circuit composed of a diode and a capacitor, and the other end (positive electrode side) is connected to the primary side ground.
  • the auxiliary winding Wa and the rectifying / smoothing circuit constitute an auxiliary power source 19 that supplies driving power to the controller 13.
  • the controller 13 is a PWM (Pulse Width Modulation) control system control circuit, and includes a PWM comparator 131, a triangular wave generator 132, voltage dividing resistors 133 and 134, a driver 135, a start circuit 136, and a regulator 137.
  • the PWM comparator 131 compares a feedback signal described later and a triangular wave signal, and outputs a PWM signal for controlling the switching element 12 from the output terminal via the driver 135.
  • the triangular wave generator 132 is connected to the inverting input terminal of the PWM comparator 131 and outputs a triangular wave signal.
  • One end of the voltage dividing resistor 133 is connected to the regulator 137, the other end of the voltage dividing resistor 133 and one end of the voltage dividing resistor 134 are connected to each other, and the other end of the voltage dividing resistor 134 is connected to the primary side ground.
  • the connection point of the voltage dividing resistors 133 and 134 is connected to the non-inverting input terminal of the PWM comparator 131 and the phototransistor 185 connected to the outside of the controller 13, and outputs a feedback signal corresponding to the current flowing through the LED 2.
  • the start circuit 136 is connected to one end of the capacitor 33, the auxiliary power supply 19, and the regulator 137 through a resistor, and the regulator 137 supplies driving power to each part of the controller 13.
  • the input voltage detector 15 in the LED lighting circuit 1 includes a diode 151, a capacitor 152, voltage dividing resistors 153 and 154, and a transistor 155.
  • the anode of the diode 151 is connected to the other end of the tertiary winding W3, and the cathode is connected to one end of the capacitor 152 and the base of the transistor 155.
  • the other end of the capacitor 152 is connected to the secondary side ground.
  • the transistor 155 is an npn transistor.
  • the collector of the transistor 155 is connected to one end of the output capacitor 14 via a resistor, and the emitter of the transistor 155 is connected to the secondary side ground.
  • the charging voltage of the capacitor 152 is divided by the voltage dividing resistors 153 and 154 and applied to the base of the transistor 155.
  • the tertiary winding W3 of the transformer 11 may be regarded as a part of the input voltage detector 15.
  • the discharger 16 in the LED lighting circuit 1 is composed of an npn transistor, the collector of the discharger 16 is connected to one end of the output capacitor 14, and the emitter of the discharger 16 is connected to the secondary side ground.
  • the base of electrical device 16 is connected to the collector of transistor 155. That is, the discharge signal of the input voltage detector 15 is output from the collector of the transistor 155 to the discharger 16.
  • the feedback circuit 18 includes an error amplifier 181, a detection resistor 182, a Zener diode 183, a photodiode 184, and a phototransistor 185.
  • the error amplifier 181 calculates an error between the current flowing through the LED 2 and the reference value and outputs the error to the photodiode 184.
  • One end of the detection resistor 182 is connected in series with the LED 2 and connected to the inverting input terminal of the error amplifier 181, and the other end is connected to the secondary side ground.
  • the detection resistor 182 outputs a voltage signal (detection signal) based on the current flowing through the LED 2.
  • the anode of the Zener diode 183 is connected to the secondary side ground, and the cathode is connected to one end of the output capacitor 14 and the non-inverting input terminal of the error amplifier 181 through a resistor.
  • the Zener diode 183 functions as a reference voltage source that outputs a reference value by clamping the voltage of the output capacitor 14.
  • the anode of the photodiode 184 is connected to one end of the output capacitor 14, and the cathode is connected to the output terminal of the error amplifier 181.
  • the collector of the phototransistor 185 is connected to the controller 13, and the emitter of the phototransistor 185 is connected to the primary side ground.
  • the photodiode 184 and the phototransistor 185 constitute a photocoupler.
  • the feedback circuit 18 outputs a feedback signal based on an error between the current flowing through the LED 2 and the reference value to the controller 13 via the photocoupler.
  • a forward voltage based on the input voltage is generated in the tertiary winding W3 that is a forward output winding.
  • the forward voltage is rectified and smoothed by the diode 151 and the capacitor 152 and converted to a DC signal corresponding to the level of the input voltage.
  • a DC signal based on the input voltage is divided by voltage dividing resistors 153 and 154 and supplied to the base of the transistor 155. Therefore, a current flows between the collector and emitter of the transistor 155, and the discharger 16 is turned off.
  • the level of the DC signal based on the forward voltage is lowered and the collector potential of the transistor 155 is increased. Turn on. Since the electric charge stored in the output capacitor 14 is rapidly discharged by the conduction of the discharger 16, the output voltage of the LED lighting circuit 1 immediately drops to near the base-emitter voltage (about 0.6V).
  • the output capacitor 14 starts to be discharged under the following conditions.
  • the voltage drop due to the diode bridge 32 is VF1
  • the voltage drop due to the diode 151 is VF2
  • the base emitter voltage drop due to the transistor 155 is VBE
  • the resistance values of the voltage dividing resistors 153 and 154 are R1, R2, respectively.
  • the number of turns of the primary winding W1 is nW1
  • the number of turns of the tertiary winding W3 is nW3.
  • the condition is that the effective value of the AC input voltage is (VF1 + (VF2 + VBE ⁇ (R1 + R2) / R2) ⁇ nW1 / nW3 or less).
  • the instantaneous value of the AC input voltage is VF1 + VBE ⁇ (R1 + R2) / R2 ⁇ nW1 / nW3 or less.
  • the LED lighting circuit it is possible to detect that the input voltage has become equal to or lower than a predetermined value and to rapidly discharge the charge stored in the output capacitor. Thereby, when the input voltage supplied from the input power source to the LED lighting device is lost in the operation of removing the LED lighting device or the like, it is possible to reduce the possibility of discharge to surrounding people or objects.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Dc-Dc Converters (AREA)
  • Led Devices (AREA)

Abstract

La présente invention concerne un circuit d'éclairage à DEL capable d'être manipulé en toute sécurité en abaissant immédiatement la tension de sortie quand la tension d'entrée depuis, par exemple, une alimentation électrique commerciale a disparu. Le circuit d'éclairage à DEL convertit une tension d'entrée en une tension continue désirée et fournit la tension continue à une DEL. Le circuit d'éclairage à DEL comprend : un transformateur ayant au moins un enroulement primaire et un enroulement secondaire ; un élément de commutation ; un contrôleur ; un condensateur de sortie ; un détecteur de tension d'entrée ; et un déchargeur. Le détecteur de tension d'entrée détecte la tension d'entrée et transmet un signal de décharge dépendant du niveau de la tension d'entrée détectée au déchargeur. Le déchargeur est connecté aux deux extrémités du condensateur de sortie et décharge la charge accumulée dans le condensateur de sortie en réponse au signal de décharge transmis par le détecteur de tension d'entrée.
PCT/JP2012/073879 2011-09-20 2012-09-19 Circuit d'éclairage à del WO2013042673A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-205201 2011-09-20
JP2011205201A JP2013069426A (ja) 2011-09-20 2011-09-20 Ｌｅｄ点灯回路

Publications (1)

Publication Number Publication Date
WO2013042673A1 true WO2013042673A1 (fr) 2013-03-28

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PCT/JP2012/073879 WO2013042673A1 (fr) 2011-09-20 2012-09-19 Circuit d'éclairage à del

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JP (1) JP2013069426A (fr)
WO (1) WO2013042673A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112986787A (zh) * 2021-05-20 2021-06-18 江西省兆驰光电有限公司 一种发光二极管测试装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005019266A (ja) * 2003-06-27 2005-01-20 Tabuchi Electric Co Ltd 高調波電流抑制回路を備えた放電ランプ用電源回路
JP2009296790A (ja) * 2008-06-05 2009-12-17 Sharp Corp スイッチング電源装置
JP2010055824A (ja) * 2008-08-26 2010-03-11 Panasonic Electric Works Co Ltd Ｌｅｄ駆動装置、照明装置及び照明器具
JP2010153599A (ja) * 2008-12-25 2010-07-08 Funai Electric Co Ltd 電源回路およびそれを備えた電子機器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005019266A (ja) * 2003-06-27 2005-01-20 Tabuchi Electric Co Ltd 高調波電流抑制回路を備えた放電ランプ用電源回路
JP2009296790A (ja) * 2008-06-05 2009-12-17 Sharp Corp スイッチング電源装置
JP2010055824A (ja) * 2008-08-26 2010-03-11 Panasonic Electric Works Co Ltd Ｌｅｄ駆動装置、照明装置及び照明器具
JP2010153599A (ja) * 2008-12-25 2010-07-08 Funai Electric Co Ltd 電源回路およびそれを備えた電子機器

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112986787A (zh) * 2021-05-20 2021-06-18 江西省兆驰光电有限公司 一种发光二极管测试装置
CN112986787B (zh) * 2021-05-20 2021-07-30 江西省兆驰光电有限公司 一种发光二极管测试装置

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