A ZERO VOLTAGE/CURRENT SWITCHING CIRCUIT FOR REDUCED RIPPLE CURRENT OF THE FULL-BRIDGE DC/DC CONVERTER

摘要

According to the present invention, zero voltage / zero current switching is possible even for a switching element composed of a minority carrier element using only a passive element on the secondary side without using a separate saturation reactor or an active element. The present invention relates to a circuit for zero voltage / zero current switching of a full bridge DC / DC converter capable of reducing ripple of output current, which can significantly reduce ripple of the present invention. A transformer (T) for inducing current and voltage on the primary side to the secondary side in accordance with the opening and closing operations of the switches S1, S2, S3, and S4; A full bridge rectifier BD10 for flowing current in one direction on the secondary side; And an output filter (L ₀ , C ₀ ) on the secondary side and as a component according to the invention; A capacitor (C100) connected in series between the output terminal of the rectifier (BD10) and ground; and a discharge diode (D100); A second winding (L _o2 ) of the output smoothing inductor (L _o ) connected in series with the capacitor (C100) in parallel, and each element is connected in series; and a charging diode (D101); And a second capacitive element (C101) connected between the current output point of the charging diode (D101) and a ground, and includes zero voltage / zero current switching and flows through the inductor (L _o ) of the output filter. The ripple cancellation of the current is also achieved, so that the full bridge DC / DC converter in which the circuit according to the present invention is installed does not include lossy components such as saturation reactors or expensive components such as active components, and can be implemented at low cost. In addition, it is a very economical and useful invention that enables high power density and can be easily used in a large capacity high frequency switching DC / DC converter field.