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1. (WO2008086050) ELECTRONIC CIRCUIT FOR DRIVING A DIODE LOAD
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2008/086050 International Application No.: PCT/US2008/050026
Publication Date: 17.07.2008 International Filing Date: 02.01.2008
IPC:
G05F 1/46 (2006.01) ,H05B 33/08 (2006.01)
G PHYSICS
05
CONTROLLING; REGULATING
F
SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
1
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
10
Regulating voltage or current
46
wherein the variable actually regulated by the final control device is dc
H ELECTRICITY
05
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
B
ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
33
Electroluminescent light sources
02
Details
08
Circuit arrangements not adapted to a particular application
Applicants:
ALLEGRO MICROSYSTEMS, INC. [US/US]; 115 Northeast Cutoff Worcester, Massachusetts 01615-0036, US (AllExceptUS)
SZCZESZYNSKI, Gregory [CA/US]; US (UsOnly)
WEKHANDE, Shashank [IN/US]; US (UsOnly)
MANGTANI, Vijay [US/US]; US (UsOnly)
Inventors:
SZCZESZYNSKI, Gregory; US
WEKHANDE, Shashank; US
MANGTANI, Vijay; US
Agent:
ROBINSON, Kermit ; Daly, Crowley, Mofford & Durkee, LLP Suite 301A 354A Turnpike Street Canton, Massachusetts 02021, US
Priority Data:
11/619,67504.01.2007US
Title (EN) ELECTRONIC CIRCUIT FOR DRIVING A DIODE LOAD
(FR) CIRCUIT ÉLECTRONIQUE PERMETTANT D'ENTRAÎNER UNE CHARGE DE DIODE
Abstract:
(EN) An electronic circuit includes circuit portions for identifying a largest voltage drop through one of a plurality of series connected diode strings and for controlling a boost switching regulator according to the largest voltage drop. The electronic circuit can sense an open circuit series connected diode string, which would otherwise have the largest voltage drop, and can disconnect that open circuit series connected diode string from control of the boost switching regulator. Another electronic circuit includes a current limiting circuit coupled to or within a boost switching regulator and configured to operate with a diode load. Another electronic circuit includes a pulse width modulation circuit configured to dim a series connected string of light emitting diodes.
(FR) L'invention concerne un circuit électronique qui comprend des parties de circuit pour identifier la chute de tension la plus grande par l'une d'une pluralité de chaînes de diodes raccordées en série et pour commander un régulateur de commutation de survoltage selon la chute de tension la plus grande. Le circuit électronique peut détecter une chaîne de diodes raccordées en série à circuit ouvert, qui connaît sinon la chute de tension la plus grande, et peut déconnecter cette chaîne de diodes raccordées en série à circuit ouvert de la régulation du régulateur de commutation de survoltage. Un autre circuit électronique comprend un circuit limiteur de courant couplé à ou dans un régulateur de commutation de survoltage et configuré pour fonctionner avec une charge de diode. Un autre circuit électronique comprend un circuit de modulation de largeur d'impulsion configuré pour réduire une chaîne raccordée en série de diodes électroluminescentes.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, SV, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MT, NL, NO, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)