WO2012107791A1 - Pilote de source de lumière, appareil d'éclairage et véhicule - Google Patents

Pilote de source de lumière, appareil d'éclairage et véhicule Download PDF

Info

Publication number
WO2012107791A1
WO2012107791A1 PCT/IB2011/000476 IB2011000476W WO2012107791A1 WO 2012107791 A1 WO2012107791 A1 WO 2012107791A1 IB 2011000476 W IB2011000476 W IB 2011000476W WO 2012107791 A1 WO2012107791 A1 WO 2012107791A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
terminal
source
source driver
lighting apparatus
Prior art date
Application number
PCT/IB2011/000476
Other languages
English (en)
Inventor
Wim Teulings
Antoine Capel
Original Assignee
Freescale Semiconductor, Inc.
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 Freescale Semiconductor, Inc. filed Critical Freescale Semiconductor, Inc.
Priority to PCT/IB2011/000476 priority Critical patent/WO2012107791A1/fr
Publication of WO2012107791A1 publication Critical patent/WO2012107791A1/fr

Links

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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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

  • This invention relates to a light-source driver, a lighting apparatus and a vehicle.
  • Light-sources such as light bulbs or light emitting diodes, may be connected to a source of electrical power for being stimulated to radiate electromagnetic energy in a range of the spectrum visible to the human eye. Adjacent parts of the spectrum, such as infrared or ultraviolet, may also be regarded as light. If the light-source requires provision of electrical current or voltage at a level different to that the available electrical power source, such as a battery, a dynamo, a photovoltaic cell etc., that is any current source or voltage source, is capable of providing, the light source may be used as part of a light-source driver, having a converter circuit coupled between the electrical power source and the light-source.
  • the basic structure of a lighting apparatus 10 contains a light-source 12 and an electrical power source 14, but may contain additional circuitry such as a converter circuit 16, or switches or fuses (not shown).
  • the light-source 12 may for example be a single light emitting diode (LED).
  • the light-source is given by a set of LEDs 18, 20, 22, for example high-brightness LEDs whose anodes are connected together. Due to the spread in forward voltage of the different LEDs, it is difficult to apply the same supply voltage across all the LEDs. For that reason, each LED has a small regulator in series with it, regulating the LED-current to the desired level.
  • this configuration is referred to as a quasi-parallel connection, with the LED anodes, in order to have favourable heat evacuation properties, being thermally and electrically directly connected, and the cathodes being connected through a dissipative current regulator circuit 24 for regulating the probably differing LED forward voltages.
  • the converter circuit 16 may for example be a switched mode power supply. Voltage regulation may for example be provided by varying the ratio of on to off time of a switch inside converter circuit 16. Spectral ripples in the input voltage received by the converter circuit 16, for example caused by electromagnetic interference (EMI), for example when the power source 14 is connected through long, unshielded power lines 26, 28, may be filtered by an input filter, for example consisting of an inductor 30 and a capacitor 32.
  • EMI electromagnetic interference
  • the lighting apparatus 10 may for example be an automotive lighting apparatus, for example containing headlamps and/or rear lamps of a car.
  • the electrical power source 14, shown in FIG. 1 as a voltage source may for example be a battery.
  • Two long supply lines 26, 28 connect the battery to the light-source driver 34.
  • the length of these lines or cables can for example be several meters, and thereby be at risk of emitting and receiving electromagnetic radiation when the spectral contents of the current that is carried by the lines is high.
  • the shown input filter is used to limit the spectral contents. In the shown basic form, this filter may comprise a capacitor 32 and an inductor 30. Size and volume of these components may be considerable, since the inductor 30 should be able to carry high supply currents without saturating the magnetic material of its core.
  • the value of the capacitor 32 is dependent on the shape of the current drawn by the converter circuit. Often, the value of this capacitor 32 is high and a polarized, electrolytic capacitor is used.
  • the light-source driver contains a Buck converter 36, i.e. a step-down DC to DC converter, driving the set of LEDs 18, 20, 22. It alternates between connecting the inductor 38 to the source voltage via switch 40 in order to store energy in the inductor 38 and discharging the inductor 38 into the light-source, i.e. the load, by means of a current through a freewheeling diode 42.
  • a capacitor 44 serves as an output filter for smoothing the current supplied to the light-source 12.
  • the Buck converter requires the input filter 30, 32. As shown in FIG. 3, unfiltered input current 46 at switch 40 is discontinuous over time, with current 48 at inductor 38 giving current 50 through the light-source.
  • a Buck converter LED driver circuit is shown in US 7,750,616.
  • the present invention provides a light-source driver, a lighting apparatus and a vehicle as described in the accompanying claims.
  • FIG. 1 schematically shows an example of a lighting apparatus with a first prior art light- source driver.
  • FIG. 2 schematically shows an example of a lighting apparatus with a second prior art light- source driver.
  • FIG. 3 schematically shows a diagram of an example of converter circuit input and output current over time according to the second prior art light-source driver.
  • FIG. 4 schematically shows an example of a lighting apparatus with a first embodiment of a light-source driver.
  • FIG. 5 schematically shows an example of a lighting apparatus with a second embodiment of a light-source driver.
  • FIG. 6 schematically shows a diagram of an example of converter circuit input and output current over time according to the second embodiment of a light-source driver.
  • FIG. 7 schematically shows an embodiment of a vehicle having a lighting apparatus.
  • the light-source 64 driver may comprise at least one light- source 52, and a converter circuit 66 comprising a first 68 and a second input terminal 70 connectable to a power source 54, a first 72 and a second output terminal 74 connected to the at least one light-source 52, a first 76 and a second inductive member 78, a capacitive member 80 and a first 82 and a second switching member 84; wherein the first input terminal 68 is connected to a first terminal of the first inductive member 76 having a second terminal connected to a first terminal of the first switching member 82 and to a first terminal of the capacitive member 80; and a second terminal of the first switching member 82 is connected to the first output terminal and to a first terminal of the second switching member 84 having a second terminal connected to a second terminal of the capacitive member 80 and to a first terminal of the second inductive member
  • first and second terminal of a component may comprise that first and second terminal do not refer to the same terminal.
  • connected may refer to an electrically conductive connection.
  • Input filter functionality is integrated in the converter circuit, providing an improved dynamic behaviour, which may allow for example, when being used as part of a light-source driver for an automotive lighting application, a fast, but overshoot-free start up, which may be helpful e.g. for dimming.
  • the lighting apparatus 60 may for example be an automotive lighting apparatus, including a headlamp of a car, connected to a power source 54, which may for example be a car battery, connected to the first and second input terminals 68, 70 of the converter circuit 66 via long supply lines 56, 58.
  • the power source 54 may for example be any voltage supply or current supply.
  • the first and second switching devices 82, 84 may for example be semiconductor switches.
  • the first switching device 82 may for example be an active switch, i.e. a controlled switch, such as a transistor, receiving control signals from a controller (not shown).
  • the second switching device 84 may for example be a passive switch such as a diode, arranged to switch into a conductive state after blocking, i.e. switching to an off- or non-conductive state of switching member 82 to allow flow of a freewheeling current through the light-source 52, which may for example be a set of quasi- parallel LEDs 88, 90, 92 connected to a dissipative current regulator 94, driven by the energy stored by the second inductive member 78. As shown in FIG.
  • the converter circuit 66 may be implemented as a "zero ripple buck converter" and may allow removing or down-sizing a connected input filter to a small capacitor 62, since an input filter is integrated in the converter topology as first inductive member 78 and capacitive member 80. Output filtering may be achieved by a capacitive output member 86 connected between the first and second output terminals 72, 74.
  • FIG. 5 an example of a lighting apparatus 60 with a second embodiment of a light-source driver 64 is schematically shown. Only components differing from the lighting apparatus shown in FIG. 4 will be described in detail.
  • the first 82 and the second switching members 84 may be active switches, such as transistors, e.g. bipolar transistors or MOSFET or any other active semiconductor device, thereby reducing conduction and switching losses, which may occur in a freewheeling diode.
  • active switches such as transistors, e.g. bipolar transistors or MOSFET or any other active semiconductor device, thereby reducing conduction and switching losses, which may occur in a freewheeling diode.
  • no passive diodes may be used for switching.
  • Efficiency of the shown converter circuit using active switches may be for example at least 90%.
  • the active switches may be controlled by a controller module (not shown).
  • the second switching member 84 may be arranged to be switched synchronously to the first switching member 82.
  • the controller may be arranged to switch the first and second active switches synchronously, in an inverse manner, switching off, i.e. switching in a non-conductive state one of the switches while switching on, i.e. switching in a conductive state, the other.
  • synchronous it is meant that the first and second switching members are opened and closed in opposite phase, such that when one switch conducts, the other is blocked, which may reduce switching and conduction, losses, and may allow to avoid a discontinuous conduction operating mode a classical Buck converter might get in at start up or under small load conditions.
  • the first and second inductive members 76, 78 may be provided as one magnetically coupled inductive device, e.g. as strongly coupled power inductors. Ripple of the input current provided to the converter circuit 66 may be low or zero when both inductive members 76, 78 are magnetically strongly coupled or coupled without leakage. Strongly coupled power inductors (continuous input current) may be available at a competitive price, for example in surface mounted technology.
  • the controlled light-source driver may behave very similar to or exactly as a DC load. Output current ripple may be strongly or completely removed.
  • two 22 ⁇ single inductors may be replaced with one coupled inductor of 1 1 ⁇ per winding, potentially allowing for the selection of a smaller inductor, or one the same size that has lower DC-resistance (DCR) and higher current handling.
  • DCR DC-resistance
  • the selection of one coupled inductor over two single parts may also save board space and can also save cost.
  • the shown converter circuit 66 may have the same or a very similar DC transfer function compared to a classical Buck converter.
  • a major advantage of the shown light-source driver 64 may be that it draws a continuous DC input current with strongly reduced spectral contents (low or zero ripple) instead of a pulsed, discontinuous input current (cf. FIG. 3), the filtering of which requires an input filter, such as the LC-filter shown in FIG. 2, where the values of the inductor and the capacitor will typically be high if low values of current- and voltage ripple must be achieved.
  • An input filter for continuous input current may be less voluminous.
  • a ceramic capacitor may be connected to the first 68 and second input terminals 70, i.e.
  • a small and reliable capacitive device may be used instead of a failure sensitive and probably voluminous electrolytic capacitor. Since the ability to withstand a reverse battery connection may be considered a general requirement to any battery-supplied equipment, an electrolytic capacitor may usually be accompanied by an additional protection diode, which may not be required for a ceramic capacitor.
  • the inductor of an input filter must also be able to withstand a high DC current without saturating, and effectively participate to filtering out the AC component of the current drawn. In the shown embodiment, no such inductor for the input filter may be used.
  • the first and second input terminals 68, 70 may be directly connected to supply lines 56, 58 from the power source 54. In other words, no external input filter may be used.
  • the shown converter circuit may be able to operate without any input filter connected even in the case of electromagnetic interferences encountered on long unshielded supply lines. This may allow to further reduce the size of the light-source driver.
  • the shown converter may be able to operate with small or even without an output capacitor, contrarily to a classical Buck converter.
  • no output capacitive device may be connected between the first 72 and second output terminal 74.
  • a continuous output current may be available.
  • No output filter may be used.
  • the DC behaviour may be similar or identical to bulb lamps.
  • the controller circuit may be retrofitted to a body controller designed to only drive bulb-lamps, which may allow to easily replace bulb lamps by LEDS on a vehicle.
  • FIG. 6 a diagram of an example of converter circuit input and output current over time according to the second embodiment of a light-source driver is shown.
  • the converter circuit output current through the light-source 100 as well as the input current through the first inductive member 76 and the second inductive member 78 are continuous over time, each of the three sets of current curves shown refers to a current measured for different coupling factors between first and second inductive members.
  • the factor varies from 0.1 to 0.97, with the smallest current ripple for a factor of 0.97.
  • the converter circuit may be arranged to receive a first voltage at the first and second input terminals 68, 70 and to provide a second voltage lower than the first voltage, having the same polarity, at the first and second output terminals 72, 74.
  • the presented converter circuit may be regarded as a DC-DC downconversion circuit, without providing an inverted voltage, which may help avoid circuitry for inverting the converted input voltage.
  • HB high-brightness
  • a lighting apparatus may comprise a lamp module 1 12, and a light-source driver as described before.
  • the lighting apparatus or lighting application may comprise, besides a power source, such as a battery 1 14 at least one lamp module 1 12 or lamp body and for example a body control module or front body module 1 16 connected via power lines.
  • the front body module 1 16 may for example comprise fuses for protecting the lighting apparatus.
  • a vehicle comprising a lighting apparatus or a light-source driver as described above may be a car. Or it may be any other automotive apparatus comprising a light-source, for example a motorcycle, a train, a ship, a helicopter, a plane etc.
  • At least one light source 52 may be located inside the lamp module.
  • the converter circuit may for example be located in the front body module. In an embodiment, the converter circuit may be located inside the lamp module 1 12 since the LED temperature can then be monitored and controlled, to avoid preliminary LED damage caused by overtemperature.
  • the light-source driver may be as small as possible, having capacitor and inductor values chosen minimal, while using as few capacitors and inductors as possible.
  • the lamp module may for example be a headlamp of a vehicle, or a rear lamp module 1 18.
  • connections as discussed herein may be any type of connection suitable to transfer signals from or to the respective nodes, units or devices, for example via intermediate devices. Accordingly, unless implied or stated otherwise, the connections may for example be direct connections or indirect connections.
  • the connections may be illustrated or described in reference to being a single connection, a plurality of connections, unidirectional connections, or bidirectional connections. However, different embodiments may vary the implementation of the connections. For example, separate unidirectional connections may be used rather than bidirectional connections and vice versa.
  • plurality of connections may be replaced with a single connections that transfers multiple signals serially or in a time multiplexed manner. Likewise, single connections carrying multiple signals may be separated out into various different connections carrying subsets of these signals. Therefore, many options exist for transferring signals.
  • any arrangement of components to achieve the same functionality is effectively “associated” such that the desired functionality is achieved.
  • any two components herein combined to achieve a particular functionality can be seen as “associated with” each other such that the desired functionality is achieved, irrespective of architectures or intermedial components.
  • any two components so associated can also be viewed as being “operably connected,” or “operably coupled,” to each other to achieve the desired functionality.
  • the illustrated examples may be implemented as circuitry located on a single integrated circuit or within a same device.
  • the converter circuit 66 and light-source may be located within the same device.
  • the example may be implemented as any number of separate integrated circuits or separate devices interconnected with each other in a suitable manner.
  • the converter circuit 66 may be located in a different module than but connected to the light-source 52.
  • the examples, or portions thereof may implemented as soft or code representations of physical circuitry or of logical representations convertible into physical circuitry, such as in a hardware description language of any appropriate type.
  • the invention is not limited to physical devices or units implemented in nonprogrammable hardware but can also be applied in programmable devices or units able to perform the desired device functions by operating in accordance with suitable program code, such as mainframes, minicomputers, servers, workstations, personal computers, notepads, personal digital assistants, electronic games, automotive and other embedded systems, cell phones and various other wireless devices, commonly denoted in this application as 'computer systems'.
  • suitable program code such as mainframes, minicomputers, servers, workstations, personal computers, notepads, personal digital assistants, electronic games, automotive and other embedded systems, cell phones and various other wireless devices, commonly denoted in this application as 'computer systems'.
  • any reference signs placed between parentheses shall not be construed as limiting the claim.
  • the word 'comprising' does not exclude the presence of other elements or steps then those listed in a claim.
  • the terms "a” or "an,” as used herein, are defined as one or more than one.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

Le pilote de source de lumière (64) selon l'invention comprend au moins une source de lumière (52), et un circuit convertisseur (66) comprenant une première (68) et une seconde borne d'entrée (70) connectables à une source d'énergie (54), une première (72) et une seconde borne de sortie (74) connectées à la ou aux sources de lumière, un premier (76) et un second élément inductifs (78), un élément capacitif (80) et un premier (82) et un second élément de commutation (84). La première borne d'entrée est connectée à une première borne du premier élément inductif ayant une seconde borne connectée à une première borne du premier élément de commutation et à une première borne de l'élément capacitif ; et une seconde borne du premier élément de commutation est connectée à la première borne de sortie et à une première borne du second élément de commutation ayant une seconde borne connectée à une seconde borne de l'élément capacitif et à une première borne du second élément inductif ayant une seconde borne connectée à la seconde borne d'entrée et à la seconde borne de sortie.
PCT/IB2011/000476 2011-02-07 2011-02-07 Pilote de source de lumière, appareil d'éclairage et véhicule WO2012107791A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2011/000476 WO2012107791A1 (fr) 2011-02-07 2011-02-07 Pilote de source de lumière, appareil d'éclairage et véhicule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2011/000476 WO2012107791A1 (fr) 2011-02-07 2011-02-07 Pilote de source de lumière, appareil d'éclairage et véhicule

Publications (1)

Publication Number Publication Date
WO2012107791A1 true WO2012107791A1 (fr) 2012-08-16

Family

ID=44625910

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/000476 WO2012107791A1 (fr) 2011-02-07 2011-02-07 Pilote de source de lumière, appareil d'éclairage et véhicule

Country Status (1)

Country Link
WO (1) WO2012107791A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9134444B2 (en) 2012-11-27 2015-09-15 Chevron U.S.A., Inc. System and method for deducing cavern properties
FR3041207A1 (fr) * 2015-09-14 2017-03-17 Valeo Vision Dispositif lumineux comportant un etage de conversion d’alimentation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100128479A1 (en) * 2007-04-03 2010-05-27 Osram Gesellschaft Mit Beschrankter Haftung Semiconductor Light Module
US7750616B2 (en) 2007-06-21 2010-07-06 Green Mark Technology Inc. Buck converter LED driver circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100128479A1 (en) * 2007-04-03 2010-05-27 Osram Gesellschaft Mit Beschrankter Haftung Semiconductor Light Module
US7750616B2 (en) 2007-06-21 2010-07-06 Green Mark Technology Inc. Buck converter LED driver circuit

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CAPEL ET AL.: "A versatile zero ripple topology", POWER ELECTRONICS SPECIALISTS CONFERENCE, 1988
VEERACHARY M: "Two-loop voltage-mode control of coupled inductor step-down buck converter", IEE PROCEEDINGS: ELECTRIC POWER APPLICATIONS, INSTITUTION OF ELECTRICAL ENGINEERS, GB, vol. 152, no. 6, 4 November 2005 (2005-11-04), pages 1516 - 1524, XP006025417, ISSN: 1350-2352, DOI: 10.1049/IP-EPA:20045104 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9134444B2 (en) 2012-11-27 2015-09-15 Chevron U.S.A., Inc. System and method for deducing cavern properties
FR3041207A1 (fr) * 2015-09-14 2017-03-17 Valeo Vision Dispositif lumineux comportant un etage de conversion d’alimentation

Similar Documents

Publication Publication Date Title
US8934275B2 (en) Switching loss reduction in converter modules
US9350243B2 (en) Power converter with separate buck and boost conversion circuits
US10658857B2 (en) Power management circuit and mobile terminal
US20120268008A1 (en) LED Circuits and Assemblies
Baek et al. Single-stage buck-derived LED driver with improved efficiency and power factor using current path control switches
WO2009147563A2 (fr) Circuit et procédé d'attaque de lampe à del
US10264635B2 (en) Ripple suppression circuit and light emitting diode driver
US9674907B1 (en) Input surge protection circuit and method for a non-isolated buck-boost LED driver
Palanidoss et al. Experimental analysis of conventional buck and boost converter with integrated dual output converter
CN104202876A (zh) 一种单电感的led驱动电路及驱动方法
US20130020960A1 (en) Power supply with charge pump and control method thereof
CN104115558B (zh) 用于ac供电电子器件的辅助电源
Barwar et al. Demystifying the devices behind the LED light: LED driver circuits
WO2012107791A1 (fr) Pilote de source de lumière, appareil d'éclairage et véhicule
JP6143779B2 (ja) 発光デバイス及びシステム
US8941318B2 (en) Power supply for illumination and luminaire
US9276492B2 (en) Circuit to keep electronic transformers working while under-loaded
US9900937B2 (en) Constant-current constant-voltage (CCCV) control unit power supply
Dong et al. Single-inductor multiple-output current-source converter with improved cross regulation and simple control strategy
CN104955216B (zh) 一种采用升压恒流驱动单元的led恒流驱动电路及装置
CN108702828B (zh) 固态照明组件
KR20140049841A (ko) Ｌｅｄ 조명등용 전원 공급 장치 및 그 방법과 그를 이용한 ｌｅｄ 조명 장치
CN206596266U (zh) 发光二极体电路
Agrawal et al. Modelling and Simulation of Integrated Topology of DC/DC converter for LED Driver Circuit
WO2023274696A1 (fr) Module de tension d'abaissement pour systèmes d'alimentation d'urgence

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: 11715266

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: 11715266

Country of ref document: EP

Kind code of ref document: A1