Patent ID: 7078867
Filing Date: 2006-07-18
Classification: H02M,H05B,Y02B

Abstract:
1. A DC-DC converter of the voltage reduction-buck type comprising: a direct current source (Vin); an ON-OFF-controllable main switching device (Qx); a main coil (Lx) in series connection to the main switching device (Qx); a fly-wheel diode (Dx) operatively arranged so that the induction current of the main coil (Lx) flows when the main switching device (Qx) is shifted into the OFF state; a smoothing capacitor (Cx) for smoothing the output of the main coil (Lx); an auxiliary coil (Lw); a resonant capacitor (Cw); and an ON-OFF-controllable auxiliary switching device (Qw), wherein the auxiliary coil (Lw) and the resonant capacitor (Cw) are series-connected to form a LC series connection, wherein the LC series connection, the main switching device (Qx) and the fly-wheel diode (Dx) are series connected, wherein the auxiliary switching device (Qw) is connected in parallel to the LC series connection, and wherein the main switching device (Qx) and the auxiliary switching device (Qw) are controlled such that they are alternatively shifted into the ON state, and the main switching device (Qx) is shifted into the ON state within a given time after the auxiliary switching device (Qw) has been shifted into the OFF state.