Part-I - Controller General of Patents Designs and Trademarks

(12) PATENT APPLICATION PUBLICATION (21) Application No.2073/CHENP/2012 A
(19) INDIA
(22) Date of filing of Application :06/03/2012 (43) Publication Date : 21/06/2013
(54) Title of the invention : ELECTRONIC BALLAST WITH DIMMING CIRCUIT
(51) International classification :H05B41/392
(31) Priority Document No :61/243744
(32) Priority Date :18/09/2009
(33) Name of priority country :U.S.A.
(86) International Application No
Filing Date
(87) International Publication No : NA
(61) Patent of Addition to Application
:NA
Number
:NA
Filing Date
(62) Divisional to Application Number
Filing Date
:PCT/IB2010/053977
:03/09/2010
:NA
:NA
(71)Name of Applicant :
1)KONINKLIJKE PHILIPS ELECTRONICS N.V.
Address of Applicant :GROENEWOUDSEWEG 1
EINDHOVEN 5621 BA NETHERLANDS
(72)Name of Inventor :
1)ERHARDT Robert J.
2)KEITH William Lawrence
3)HARISH GOPALA PILLAI Raman Nair
4)JANCZAK Jerzy
5)MI Ningliang
6)BADDELA Srinivasa
(57) Abstract :
An electronic ballast with dimming circuit including an electronic ballast dimming circuit receiving an analog dimming signal the
electronic ballast dimming circuit including an input dimming circuit (210) operable to receive the analog dimming signal (252) at
an analog dimming signal input (212); and an output dimming circuit (220) operably connected to the input dimming circuit (210)
the output dimming circuit (220) being operable to receive a fixed frequency signal (222) having a variable duty cycle and to
generate an analog dimming control signal (224) in response to the analog dimming signal (252). Output voltage at the analog
dimming signal input (212) is a function of the variable duty cycle of the fixed frequency signal (222) when the analog dimming
signal (252) is not present at the analog dimming signal input (212).
No. of Pages : 21 No. of Claims : 23
The Patent Office Journal 21/06/2013 14007