US 9,812,977 B2
Resonant converters with an improved voltage regulation range
Liming Ye, Frisco, TX (US); Heping Dai, Plano, TX (US); Dianbo Fu, 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 Apr. 1, 2015, as Appl. No. 14/676,515.
Prior Publication US 2016/0294294 A1, Oct. 6, 2016
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/33592 (2013.01) [H02M 2001/0058 (2013.01); Y02B 70/1433 (2013.01); Y02B 70/1475 (2013.01); Y02B 70/1491 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method comprising:
determining an operating mode based upon an input voltage and an output voltage of a resonant converter comprising:
a switch network coupled to an input dc power source and a resonant tank, wherein a transformer is coupled between the resonant tank and a full-bridge secondary rectifier;
configuring the switch network to operate at a buck converter mode by controlling on and off of switches of the switch network;
configuring the full-bridge secondary rectifier to operate at a boost converter mode by shorting a secondary side winding of the transformer;
configuring the switch network to operate at the buck converter mode in response to a first input voltage from the input dc power source; and
configuring the full-bridge secondary rectifier to operate at the boost converter mode in response to a second input voltage from the input dc power source, wherein:
the first input voltage is higher than the output voltage of the resonant converter; and
the second input voltage is lower than the output voltage of the resonant converter.