WO2013120893A1 - Circuit de pilote de charge à capteur de courant comprenant diode de protection - Google Patents

Circuit de pilote de charge à capteur de courant comprenant diode de protection Download PDF

Info

Publication number
WO2013120893A1
WO2013120893A1 PCT/EP2013/052863 EP2013052863W WO2013120893A1 WO 2013120893 A1 WO2013120893 A1 WO 2013120893A1 EP 2013052863 W EP2013052863 W EP 2013052863W WO 2013120893 A1 WO2013120893 A1 WO 2013120893A1
Authority
WO
WIPO (PCT)
Prior art keywords
load
driving circuit
current sensor
load driving
output
Prior art date
Application number
PCT/EP2013/052863
Other languages
English (en)
Inventor
Yuping Zhang
Zeke WEI
Dan LIN
Ningbo KANG
Original Assignee
Osram Gmbh
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 Osram Gmbh filed Critical Osram Gmbh
Publication of WO2013120893A1 publication Critical patent/WO2013120893A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs
    • 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 a load driving circuit, and more particularly, to a load driving circuit capable of achieving protection for a load current sensor with a simple and low cost circuit and an illumination device including the same.
  • an object of the invention is to provide a load driving circuit capable of realizing protection for a load current sensor using a simple and low-cost circuit.
  • the load driving circuit implements protections for the load current sensor by paral ⁇ lelizing a cheap diode with the load current sensor, while significantly simplifying structure of the circuit, reducing cost of the circuit and downsizing the circuit.
  • a load driving circuit including: a load driving module configured to drive the load; a capacitor connected between an output terminal of the load driving mod ⁇ ule and the ground for storing energy; a load current sensor connected with the load in series for sensing a current flow- ing through the load; and a diode connected with the load current sensor in parallel for protecting the load current sensor when an output of the load driving module is short circuit .
  • the load may be one or more light emitting diodes.
  • the capacitor may be an electrolytic capacitor.
  • the load current sensor may be a resistor.
  • an illumination device which includes the load driving circuit as described above.
  • FIG. 1 is a block diagram illustrating an example of a load driving circuit in the prior art
  • FIG. 2 is a block diagram illustrating an example of a load driving circuit according to an embodiment of the inven ⁇ tion;
  • Fig. 3 is a circuit diagram illustrating a protect circuit for the output current sensing resistor used in an prod ⁇ uct in the prior art
  • Fig. 4 is a circuit diagram illustrating a protect cir- cuit for the output current sensing resistor to which the invention is applied;
  • Fig. 5A is a schematic waveform graph illustrating current in the load driving circuit when the output of the load driving circuit is short circuit in the prior art.
  • Fig. 5B is a schematic waveform graph illustrating current in the load driving circuit when the output of the load driving circuit is short circuit according to the invention.
  • LED driving circuit 1-5B by taking a LED driving circuit as an example below. It is to be understood that the LED driving circuit herein is merely an example without limitation, those skilled in the art may readily conceive of applying the invention to other load driving circuits so as to protect the load current sen- sor when the output of the load driving circuit is short cir ⁇ cuit .
  • the exemplary LED driving circuit 200 may include a LED driving module 201, an energy storing capacitor C, one or more LEDs connected in series, an output current sensing resistor R and a diode D.
  • the operating principle of the exemplary LED driving circuit as shown in Fig. 2 will be described in detail.
  • the LED driving module 201 may be any LED driving module known to those skilled in the art for driving one or more LED loads, and no more detailed description will be made herein.
  • the energy storing capacitor C is connected between an output terminal of the LED driving module 201 and the ground, which may be an electrolytic capacitor and configured to store energy when the LED driving circuit 200 operates nor ⁇ mally.
  • the output current sensing resistor R is connected with the one or more LEDs in series to sense the output current flowing through the one or more LED loads. Most of resistors R may only pass a current no more than 10A while the current pulse when the output of the LED driving module 201 is short circuit is generally between 30-150A, thus such a large cur ⁇ rent may damage the resistor R. Further, the sensing resistor is typically very expensive.
  • the diode D is connected with the output current sensing resistor R in parallel for protecting the output current sensing resistor R when the output of the LED module 201 is short circuit.
  • the di ⁇ ode has characteristics as follows: its forward voltage is typically above 0.7V and may pass a large current of about 100A for 8ms. The diode D will not operate in normal cases since the voltage across the output current sensing resistor R is generally below 0.5V when the LED driving circuit 200 operates normally, so that normal operation of the whole cir ⁇ cuit will not be affected.
  • the energy stored in the capaci ⁇ tor C releases via one or more LED loads, the sensing resis ⁇ tor R and the diode D in a large current pulse form, then the diode D becomes conducting due to a resulting large voltage so that most of the current pulse passes the diode D to avoid broken of the sensing resistor R caused by the large current pulse .
  • the diode D is well suitable to protect the output current sensing resistor R because of its operating charac- teristics and advantages of low price, while simplifying structure of the protect circuit and reducing the cost of the circuit .
  • FIGs. 3 and 4 respectively illustrate circuit diagrams of an example of the LED driving circuit in the prior art and an example of the LED driving circuit to which the invention is applied, both of which are used in the products of model Nos. OTe9, OTel5 and OTe20 from OSRAM. Particularly, the portion indicated by the bold solid line is the protect circuit for the output current sensing resistor.
  • Figs. 5A and 5B respectively illustrate waveform graphs of the current pulses in the protect circuits for the output current sensing resistor in the prior art and according to the invention, in the case that the output of the LED driving circuit used in the product of the model No. OTe9/220- 240/700PC from OSRAM is short circuit.
  • the peak value of the short circuit current pulse is about 23.8A when the output of the LED driving circuit is short circuit.
  • At least three resistors are required for shunting in order to prevent the short circuit current pulse from damaging the output current sensing resistor.
  • the short circuit current pulse passes the three output current sensing resistors in the LED driving circuit.
  • the peak value of the short circuit current pulse is about 51.6A when the output of the LED driv ⁇ ing circuit is short circuit, in which a current of about 43.4A passes the diode while the residual current of about 8.2A passes the output current sensing resistor.
  • a current of about 43.4A passes the diode while the residual current of about 8.2A passes the output current sensing resistor.

Landscapes

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

Abstract

La présente invention concerne un circuit de pilote de charge comprenant : un module de pilote de charge (201) configuré pour piloter la charge (led1, led2); un condensateur (C) connecté entre une borne de sortie du module de pilote de charge (201) et la masse pour stocker de l'énergie; un capteur de courant de charge (R) monté en série avec la charge pour détecter un courant traversant la charge; et une diode (D) connectée en parallèle avec le capteur de courant de charge afin de protéger le capteur de courant de charge (R) d'une surintensité due à la décharge du condensateur (C) lorsque la sortie du module de pilote de charge (201) est court-circuitée. Grâce à l'invention, il est possible d'assurer la protection du capteur de courant de charge (R) avec une structure de circuit simplifiée et à un faible coût.
PCT/EP2013/052863 2012-02-15 2013-02-13 Circuit de pilote de charge à capteur de courant comprenant diode de protection WO2013120893A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2012100339806A CN103260287A (zh) 2012-02-15 2012-02-15 负载驱动电路
CN201210033980.6 2012-02-15

Publications (1)

Publication Number Publication Date
WO2013120893A1 true WO2013120893A1 (fr) 2013-08-22

Family

ID=47748595

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/052863 WO2013120893A1 (fr) 2012-02-15 2013-02-13 Circuit de pilote de charge à capteur de courant comprenant diode de protection

Country Status (2)

Country Link
CN (1) CN103260287A (fr)
WO (1) WO2013120893A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9999108B2 (en) 2014-05-14 2018-06-12 Philips Lighting Holding B.V. Emergency lighting driver with programmable output power
WO2021078562A1 (fr) * 2019-10-22 2021-04-29 Signify Holding B.V. Conducteur de led et système d'éclairage l'utilisant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005006377A2 (fr) * 2003-07-07 2005-01-20 Idea Inc Dispositif de protection et de mesure pour lampes fluorescentes a cathode froide multiples
EP2282608A2 (fr) * 2009-08-06 2011-02-09 Insta Elektro GmbH Circuit supplémentaire électronique
WO2011073865A1 (fr) * 2009-12-15 2011-06-23 Koninklijke Philips Electronics N.V. Circuit d'attaque pour lampe à diode électroluminescente

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005006377A2 (fr) * 2003-07-07 2005-01-20 Idea Inc Dispositif de protection et de mesure pour lampes fluorescentes a cathode froide multiples
EP2282608A2 (fr) * 2009-08-06 2011-02-09 Insta Elektro GmbH Circuit supplémentaire électronique
WO2011073865A1 (fr) * 2009-12-15 2011-06-23 Koninklijke Philips Electronics N.V. Circuit d'attaque pour lampe à diode électroluminescente

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9999108B2 (en) 2014-05-14 2018-06-12 Philips Lighting Holding B.V. Emergency lighting driver with programmable output power
US10404096B2 (en) 2014-05-14 2019-09-03 Signify Holding B.V. Emergency lighting system
WO2021078562A1 (fr) * 2019-10-22 2021-04-29 Signify Holding B.V. Conducteur de led et système d'éclairage l'utilisant

Also Published As

Publication number Publication date
CN103260287A (zh) 2013-08-21

Similar Documents

Publication Publication Date Title
US8482218B2 (en) Dimming input suitable for multiple dimming signal types
WO2021031753A1 (fr) Circuit de charge sécurisé pour module électroluminescent, procédé de protection et système d'émission de radar laser
JP4926784B2 (ja) 発光装置
RU2017130756A (ru) Схема возбуждения, способная контролировать использование устройства защиты от перенапряжения
EP2487993B1 (fr) Dispositif à DEL avec unité de limitation de tension partagée et résistance d'égalisation de tension individuelle
US20180231591A1 (en) Alternating Current Load Detection Circuit
US20170288396A1 (en) Varistor failure detector and method
RU2015104900A (ru) Индикатор перегорания предохранителя
JP2012169625A5 (fr)
WO2013120893A1 (fr) Circuit de pilote de charge à capteur de courant comprenant diode de protection
US20150022120A1 (en) Light emitting diode apparatus with over current protection function and system having the same
RO201200043U3 (ro) Dispozitiv cu diode emiţătoare de lumină
US8674623B2 (en) LED device with voltage-limiting unit and shunt current-limiting resistance
US20170111964A1 (en) Step-up/step-down converter with a protective circuit
US10426013B2 (en) Ground fault detection circuit, abnormality detection circuit, light emitting device, vehicle
JP2015506104A5 (fr)
CN105993204B (zh) 包括保护电路的照明系统、及保护光源免于静电放电的相应方法
EP3275286A1 (fr) Unité lumineuse et procédé de commande d'unité lumineuse
US20170040991A1 (en) Circuit state sensing
US20120206042A1 (en) Led device with voltage-limiting unit and voltage-equalizing and current-limiting resistances
US20160073461A1 (en) Light emitting device driver circuit
EP3001778B1 (fr) Dispositif accessoire connectable à un dispositif de commande
RU2668946C2 (ru) Электролюминесцентное устройство со схемой обнаружения короткого замыкания
US8624508B2 (en) LED device with voltage-limiting unit and voltage-equalizing resistance
EP2487994A2 (fr) Dispositif DEL avec unité de limitation de tension et résistance de limitation de courant de dérivation

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13705753

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13705753

Country of ref document: EP

Kind code of ref document: A1