US 9,812,968 B2
Zero voltage switching detection apparatus and method
Jinbo Huang, Shenzhen (CN); Xujun Liu, Shenzhen (CN); Dianbo Fu, Plano, TX (US); Liming Ye, Frisco, TX (US); Heping Dai, Plano, TX (US); and Daoshen Chen, Allen, TX (US)
Assigned to Futurewei Technologies, Inc., Plano, TX (US)
Filed by Futurewei Technologies, Inc., Plano, TX (US)
Filed on Nov. 19, 2014, as Appl. No. 14/548,106.
Prior Publication US 2016/0141960 A1, May 19, 2016
Int. Cl. H02M 3/158 (2006.01); H02M 3/335 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/33507 (2013.01) [H02M 3/158 (2013.01); H02M 3/1582 (2013.01); H02M 2001/0009 (2013.01); H02M 2001/0058 (2013.01); Y02B 70/1433 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A converter comprising:
a switch network coupled to a power source, wherein the switch network comprises a plurality of power switches;
a magnetic device coupled to the switch network;
a detector coupled to the magnetic device through a magnetic coupling, wherein a continuous current flowing through a primary side of the magnetic coupling is proportional to a current flowing through a power inductor of the converter, and wherein the detector comprises a dc blocking capacitor having a first terminal connected to a secondary side of the magnetic coupling, a diode and a resistor connected in series and further coupled to a second terminal of the dc blocking capacitor, and a voltage divider coupled to the second terminal of the dc blocking capacitor; and
a control circuit configured to receive a zero voltage switching signal from the detector and adjust gate drive signals of the power switches based upon the zero voltage switching signal.