DIGITAL CONTROL TYPE DC/DC CONVERTER

摘要

PURPOSE: A digital control type DC/DC converter is provided to improve a transient response and transient response time and minimize power loss and switching noise by using a digital controller and a lossless snubber circuit to control a two switch type forward DC/DC converter. CONSTITUTION: First and second switches(S1,S2) interrupt/output a DC power according to a high speed switching operation. A high frequency transformer(Tr) introduces a first side power applied by the switching operation to second side. First free wheeling diode(D1) is connected in the reverse direction between the first switch(S1) and the DC power. Second free wheeling diode(D2) is connected in the reverse direction between the second switch(S2) and a ground. A smoothing inductor(Lf) and an output capacitor(Co) smooth the output power. A snubber circuit includes a snubber capacitor(Cs) and first snubber diode(Ds1) connected in series at both ends of the transformer(Tr), and second snubber diode(Ds2) connected to the smoothing inductor(Lf) at the read end. Second side diodes(D3,D4) are zero voltage and zero current switched by the snubber circuit to restrict power loss, vibration and switching noise according to the switching operation.