Some content of this application is unavailable at the moment.
If this situation persist, please contact us atFeedback&Contact
1. (WO2018162359) MITIGATING DISTORTION IN CODED LIGHT
Latest bibliographic data on file with the International Bureau    Submit observation

Pub. No.: WO/2018/162359 International Application No.: PCT/EP2018/055211
Publication Date: 13.09.2018 International Filing Date: 02.03.2018
IPC:
H05B 37/02 (2006.01) ,H04B 10/116 (2013.01)
H ELECTRICITY
05
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
B
ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
37
Circuit arrangements for electric light sources in general
02
Controlling
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
10
Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
11
Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
114
Indoor or close-range type systems
116
Visible light communication
Applicants:
PHILIPS LIGHTING HOLDING B.V. [NL/NL]; High Tech Campus 45 5656 AE Eindhoven, NL
Inventors:
DE WILDE, Erik; NL
WILLAERT, Jurgen, Margriet, Antonius; NL
Agent:
TAKKEN, Robert, Martinus, Hendrikus; NL
VERWEIJ, Petronella, Danielle; NL
Priority Data:
17160358.210.03.2017EP
Title (EN) MITIGATING DISTORTION IN CODED LIGHT
(FR) ATTÉNUATION DE DISTORSION DANS LA LUMIÈRE CODÉE
Abstract:
(EN) Current through an illumination source is controlled by means of a feedback loop whereby the current is measured and fed back to a current controller, which compares this to a set-point and based thereon outputs a current control signal which controls downstream power circuitry driving the current through the illumination source. This keeps the illumination at a steady dim level. Data is also coded into the illumination by modulating the current control signal, i.e. at the output of the current controller, but prior to the input to the power circuitry. The present disclosure provides a compensation filter arranged to apply a compensation to the error signal, to at least partially remove an effect of a distortion of the current measurement caused by the modulation of the data symbols into the illumination source current.
(FR) Selon l'invention, le courant traversant une source d'éclairage est commandé grâce à une boucle de rétroaction, le courant étant mesuré et renvoyé à un dispositif de commande de courant, qui compare celui-ci à un point de consigne et, en fonction de la comparaison, fournit un signal de commande de courant qui commande de la circuiterie de puissance en aval pilotant le courant traversant la source d'éclairage. Ceci maintient l'éclairage à un niveau d'atténuation constant. Des données sont également codées dans l'éclairage en modulant le signal de commande courant, c'est-à-dire à la sortie du dispositif de commande de courant, mais avant l'entrée dans la circuiterie de puissance. La présente invention concerne un filtre de compensation agencé pour appliquer une compensation au signal d'erreur, pour éliminer au moins partiellement un effet d'une distorsion de la mesure de courant provoqué par la modulation des symboles de données dans le courant de source d'éclairage.
front page image
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, 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, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)