FR2305091A1 - Brightness control cct. for vehicle instrument lighting - has overvoltage protection, low power consumption and no transformer - Google Patents

Brightness control cct. for vehicle instrument lighting - has overvoltage protection, low power consumption and no transformer

Info

Publication number
FR2305091A1
FR2305091A1 FR7508504A FR7508504A FR2305091A1 FR 2305091 A1 FR2305091 A1 FR 2305091A1 FR 7508504 A FR7508504 A FR 7508504A FR 7508504 A FR7508504 A FR 7508504A FR 2305091 A1 FR2305091 A1 FR 2305091A1
Authority
FR
France
Prior art keywords
regulator
transformer
overvoltage protection
brightness control
power consumption
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
FR7508504A
Other languages
French (fr)
Other versions
FR2305091B3 (en
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.)
Safran Electrical and Power SAS
Precision Mecanique Labinal SA
Original Assignee
Labinal SA
Precision Mecanique Labinal SA
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 Labinal SA, Precision Mecanique Labinal SA filed Critical Labinal SA
Priority to FR7508504A priority Critical patent/FR2305091A1/en
Publication of FR2305091A1 publication Critical patent/FR2305091A1/en
Application granted granted Critical
Publication of FR2305091B3 publication Critical patent/FR2305091B3/fr
Granted legal-status Critical Current

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
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/041—Controlling the light-intensity of the source
    • H05B39/044—Controlling the light-intensity of the source continuously
    • H05B39/047—Controlling the light-intensity of the source continuously with pulse width modulation from a DC power source
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/10—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for dashboards
    • B60Q3/16—Circuits; Control arrangements
    • B60Q3/18—Circuits; Control arrangements for varying the light intensity
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/563—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices including two stages of regulation at least one of which is output level responsive, e.g. coarse and fine regulation
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The brightness control circuit, for instrument lighting (5V) in vehicles, has no transformer and used very little power but still gives overvoltage protection. The dc supply is coupled via a fuse and cut-out relay contacts to a pre-regulator stage. the pre-regulator consists of a series of transistor acting as chopper controlled by a comparator and feeding a series ballast inductor. The comparator compares the output of the inductor with the reference. The output of this pre-regulator is fed to a regulator which consists of a similar configuration of series transistor and comparator. The output of the regulator supplies the lamp.
FR7508504A 1975-03-19 1975-03-19 Brightness control cct. for vehicle instrument lighting - has overvoltage protection, low power consumption and no transformer Granted FR2305091A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7508504A FR2305091A1 (en) 1975-03-19 1975-03-19 Brightness control cct. for vehicle instrument lighting - has overvoltage protection, low power consumption and no transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7508504A FR2305091A1 (en) 1975-03-19 1975-03-19 Brightness control cct. for vehicle instrument lighting - has overvoltage protection, low power consumption and no transformer

Publications (2)

Publication Number Publication Date
FR2305091A1 true FR2305091A1 (en) 1976-10-15
FR2305091B3 FR2305091B3 (en) 1977-04-15

Family

ID=9152749

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7508504A Granted FR2305091A1 (en) 1975-03-19 1975-03-19 Brightness control cct. for vehicle instrument lighting - has overvoltage protection, low power consumption and no transformer

Country Status (1)

Country Link
FR (1) FR2305091A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2357142A1 (en) * 1976-06-30 1978-01-27 Borletti Spa CONTROL DEVICE FOR POWERING LIGHTING LAMPS
FR2582897A1 (en) * 1985-05-31 1986-12-05 Vibrachoc Sa METHOD AND DEVICE FOR INCREASING THE TIME OF USE OF A LIGHT SOURCE.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2357142A1 (en) * 1976-06-30 1978-01-27 Borletti Spa CONTROL DEVICE FOR POWERING LIGHTING LAMPS
FR2582897A1 (en) * 1985-05-31 1986-12-05 Vibrachoc Sa METHOD AND DEVICE FOR INCREASING THE TIME OF USE OF A LIGHT SOURCE.
EP0208120A1 (en) * 1985-05-31 1987-01-14 VIBRACHOC, Société Anonyme dite: Device for increasing the life time of an electroluminescent source

Also Published As

Publication number Publication date
FR2305091B3 (en) 1977-04-15

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