EP4110020A1 - Ensemble électronique et dispositif d'éclairage automobile - Google Patents

Ensemble électronique et dispositif d'éclairage automobile Download PDF

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Publication number
EP4110020A1
EP4110020A1 EP22180531.0A EP22180531A EP4110020A1 EP 4110020 A1 EP4110020 A1 EP 4110020A1 EP 22180531 A EP22180531 A EP 22180531A EP 4110020 A1 EP4110020 A1 EP 4110020A1
Authority
EP
European Patent Office
Prior art keywords
light
signal
electronic assembly
output signal
lighting device
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.)
Pending
Application number
EP22180531.0A
Other languages
German (de)
English (en)
Inventor
Miguel Angel CANTUDO FRANCO
Juan Jose SANTAELLA HERNANDEZ
Francisco GALVEZ JIMENEZ
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.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
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 Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP4110020A1 publication Critical patent/EP4110020A1/fr
Pending legal-status Critical Current

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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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices

Definitions

  • This invention belongs to the field of lighting devices installed in automotive vehicles, and more specifically to the electronic assemblies used in these automotive lighting devices.
  • driver elements have limitations in terms of the number of channels, the available current and so on.
  • the invention provides an alternative solution for managing the managing the operation of LEDs by an electronic assembly and an automotive lighting device.
  • the invention provides an electronic assembly for an automotive lighting device, the electronic assembly comprising:
  • the signal detector circuit may be installed in the same printed circuit board as the light groups, without affecting the structure of drivers.
  • the parameter of the output signal is the pulse width modulation rate
  • the light driver being configured to provide an output signal with different pulse width modulation rates depending on the first and second signals.
  • the pulse width modulation (PWM) rate is used in some automotive lighting applications to provide a plurality of customized actual current values from a single nominal current value.
  • PWM pulse width modulation
  • the light driver is configured to emit an output signal with a pulse width modulation higher than 60% when the first signal is active and is configured to emit an output signal with a pulse width modulation lower than 40% when the second signal is active.
  • the first light group is configured to provide a daytime running light functionality and the second light group is configured to provide a position light functionality.
  • Some lighting functionalities such as daytime running lights, use direct current (100% PWM) or may use 80% or 90% PWM.
  • other lighting functionalities such as position light, may use the same nominal amplitude value but with 20% PWM
  • the discriminator module comprises:
  • This particular arrangement detects the level of the PWM and discriminates between a "high” level of PWM (that would correspond to the first light group) and a "low” level of PWM (that would correspond to the second light group).
  • the signal detector circuit further comprises a CMOS inverter with a P-MOSFET and a N-MOSFET, arranged to control de current received by each one of the light groups.
  • the MOSFETs act as switches: depending on the signal received by the transistor, the signal will be forwarded to one of the light groups.
  • each light group comprises at least one solid-state light source, such as light emitting diodes (LEDs).
  • LEDs light emitting diodes
  • solid state refers to light emitted by solid-state electroluminescence, which uses semiconductors to convert electricity into light. Compared to incandescent lighting, solid state lighting creates visible light with reduced heat generation and less energy dissipation.
  • the typically small mass of a solid-state electronic lighting device provides for greater resistance to shock and vibration compared to brittle glass tubes/bulbs and long, thin filament wires. They also eliminate filament evaporation, potentially increasing the life span of the illumination device.
  • Some examples of these types of lighting comprise semiconductor light-emitting diodes (LEDs), organic light-emitting diodes (OLED), or polymer light-emitting diodes (PLED) as sources of illumination rather than electrical filaments, plasma or gas.
  • the invention provides an automotive lighting device comprising an electronic assembly according to the first inventive aspect.
  • This lighting device is particularly useful in automotive applications, when many lighting functionalities are required.
  • the lighting device further comprises:
  • This lighting device provides the advantageous functionality of efficiently managing the colour performance of the light sources.
  • An optical element is an element that has some optical properties to receive a light beam and emit it in a certain direction and/or shape, as a person skilled in automotive lighting would construe without any additional burden.
  • the optical element is at least one of a light guide, a lens, a reflector or a collimator.
  • optical elements are useful to manage the light produced by the plurality of light sources and provide uniform output.
  • FIG 1 shows an electronic assembly 1 according to the invention. This electronic assembly is suitable for being used in an automotive lighting device.
  • the electronic assembly 1 comprises the following elements:
  • the body control module 13 sends instructions to activate the position light or the daytime running light. These light functionalities are not active at the same time. There are other pairs of light functionalities which are not active at the same time (turning indicator and daytime running light, for example). The body control may send these instructions to the light driver 4 in the most suitable mode.
  • the light driver 4 receives the instruction to activate the daytime running light or to activate the position light. It deals internally with these instructions and provide an output signal. This output signal has always the same nominal amplitude, but has a different value of pulse width modulation (PWM).
  • PWM pulse width modulation
  • a continuous signal (100% PWM) or a high-modulation signal (80-90% PWM) is output from the driver.
  • a low-modulation signal (10-20% PWM) is sent.
  • a single output channel is therefore needed to create a signal for two different light groups, intended to provide two different functionalities.
  • the signal detector circuit 5 receives the output signal of the light driver 4.
  • This signal detector circuit comprises a discriminator module, which is configured to receive the output signal of the light driver 4 and detect the PWM rate of the output signal. After detecting this PWM rate, the signal detector circuit is configured to provide the electric signal received from the light driver either to the first LED group or to the second LED group, depending on the PWM rate of the output signal detected by the discriminator module.
  • the signal detector circuit 5, together with the LED groups 2, 3 are arranged in the same printed circuit board 14.
  • Figure 2 shows an example of a signal detector circuit 5 installed in an electronic assembly according to the invention.
  • the output signal of the light driver is received by a capacitor 7, which has a different behaviour depending on the PWM rate of the received signal. This behaviour is captured by a comparator element 8, which provides a base signal to a transistor 9, arranged to modulate the output signal from the light driver 4.
  • This modulated output is received by the current derivator, which comprises a CMOS inverter with a P-MOSFET 11 and an N-MOSFET 11, which are configured to switch on or off depending on the received signal.
  • the signal is sent either to the first LED group 2, configured to provide the daytime running light (if the output signal from the driver has a high PWM rate) or to the second LED group 3, configured to provide the position light (if the output signal from the driver has a low PWM rate)
  • FIG. 3 shows an automotive lighting device 10 comprising an electronic assembly according to the invention.
  • This lighting device provides the daytime running light and the position light by two different light groups 2, 3.
  • This lighting device comprises a projecting lens 12 which receives the light of the plurality of LEDs and shape it into a light pattern projected outside the lighting device.

Landscapes

  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP22180531.0A 2021-06-23 2022-06-22 Ensemble électronique et dispositif d'éclairage automobile Pending EP4110020A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2106726A FR3124684A1 (fr) 2021-06-23 2021-06-23 Assemblage électronique et dispositif d'éclairage automobile

Publications (1)

Publication Number Publication Date
EP4110020A1 true EP4110020A1 (fr) 2022-12-28

Family

ID=77519274

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22180531.0A Pending EP4110020A1 (fr) 2021-06-23 2022-06-22 Ensemble électronique et dispositif d'éclairage automobile

Country Status (2)

Country Link
EP (1) EP4110020A1 (fr)
FR (1) FR3124684A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190061607A1 (en) * 2015-12-23 2019-02-28 SMR Patents S.à.r.l. Control and monitoring circuit for controlling lighting system
US20190364648A1 (en) * 2018-05-22 2019-11-28 Stanley Electric Co., Ltd. Lighting tool for vehicle, illumination system and lamp control method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190061607A1 (en) * 2015-12-23 2019-02-28 SMR Patents S.à.r.l. Control and monitoring circuit for controlling lighting system
US20190364648A1 (en) * 2018-05-22 2019-11-28 Stanley Electric Co., Ltd. Lighting tool for vehicle, illumination system and lamp control method

Also Published As

Publication number Publication date
FR3124684A1 (fr) 2022-12-30

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