US 9,814,108 B2
Switched mode power supply driver integrated with a power transmission antenna
Gang Wang, Eindhoven (NL); Liang Shi, Eindhoven (NL); Ping Kian Bee, Eindhoven (NL); Jie Fu, Eindhoven (NL); and Xiao Sun, Eindhoven (NL)
Assigned to PHILIPS LIGHTING HOLDING B.V., Eindhoven (NL)
Appl. No. 15/306,089
Filed by PHILIPS LIGHTING HOLDING B.V., Eindhoven (NL)
PCT Filed Apr. 20, 2015, PCT No. PCT/EP2015/058489
§ 371(c)(1), (2) Date Oct. 22, 2016,
PCT Pub. No. WO2015/162081, PCT Pub. Date Oct. 29, 2015.
Claims priority of application No. PCT/CN2014/000445 (WO), filed on Apr. 25, 2014; and application No. 14172294 (EP), filed on Jun. 13, 2014.
Prior Publication US 2017/0048937 A1, Feb. 16, 2017
Int. Cl. H05B 33/08 (2006.01); H01F 38/14 (2006.01); H02J 50/10 (2016.01); H02M 3/335 (2006.01); H05B 37/02 (2006.01)
CPC H05B 33/0815 (2013.01) [H01F 38/14 (2013.01); H02J 50/10 (2016.02); H02M 3/33507 (2013.01); H05B 37/0227 (2013.01); H05B 37/0272 (2013.01); Y02B 20/346 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A driver comprising:
a switched mode power supply adapted to be electrically coupled to a load (Rload) and provide power supply to the load (Rload), wherein said switched mode power supply comprises an existing coil, wherein said existing coil is a power inductor of the switched mode power supply which power inductor has an active powering duration and a passive freewheeling duration so as to provide power supply to the load (Rload),
the driver circuit further comprises:
a first power transmission antenna formed as a first coil which is either the existing coil of the switched mode power supply or coupled to the existing coil of the switched mode power supply,
said first power transmission antenna is adapted for being magnetically coupled to a second power receiving antenna external to said driver and different from the load (Rload), thereby forming a wireless power transmitter,
wherein the switched mode power supply comprises a flyback converter including a transformer which has a primary side winding and a secondary side winding, wherein said secondary side winding is electrically connected to the load (Rload), and wherein the first coil of the first power transmission antenna coupled to an output terminal of the secondary side winding and adapted to receive power provided by the secondary side winding,
at least one additional coil in series with said first coil;
at least one short circuiting switch, each of which in parallel with a respective one of said least one additional coil; and
a control circuit coupled to said short circuiting switch, for controlling said switch to short circuit the respective additional coil, according to the power output by the secondary side winding and the power required to be transmitted to the second power receiving antenna.