Patent ID: 7548442

Claim:
A coupled inductor SR-Buck converter comprising: an input voltage source having a positive terminal and a negative terminal; a smoothing capacitor having a first terminal and a second terminal; a resistive load connected in parallel with said smoothing capacitor; a first inductor winding have having a first terminal and a second terminal, said second terminal of said first inductor winding being connected with said first terminal of said smoothing capacitor; a second inductor winding having a first terminal and a second terminal and being magnetically coupled with said first inductor winding and in the same polarity, said first terminal of said second inductor winding being connected with said second terminal of said smoothing capacitor; a controller; a forward switch connected in series with said input voltage source between said input voltage source and said first terminal of said first inductor winding, and being controlled by said controller to be periodically and alternately turned ON and turned OFF for periodically connecting a positive voltage to said first terminal of said first inductor winding; a fly-wheeling switch drive voltage control network; a fly-wheeling switch connected in series between said second terminal of said second inductor winding and said first terminal of said smoothing capacitor, and controlled via a voltage of said first terminal of said first inductor winding through said fly-wheeling switch drive voltage control network such that (a) said fly-wheeling switch is closed when voltage of said first terminal of said first inductor winding is negative, and (b) said fly-wheeling switch is opened when voltage of said first terminal of said first inductor winding is positive.