Zero-voltage switching quasi-resonance high-gain DC boost converter

The invention relates to a zero-voltage switching quasi-resonance high-gain DC boost converter. An LC resonance circuit is added at the rear ends of main switches S1 and S2 and the front end of an output load of an improved boost DC converter under a hard switching condition, thus, a soft switching condition is formed, the switching environment of circuits in which devices are positioned is improved, and voltage and current change rates during the switching process are slowed via resonance; voltages at both ends of each of the main switches S1 and S2 are reduced to zero before the main switches S1 and S2 are switched on, so that the switching loss and switching noise are reduced; circuit efficiency under the soft switching condition is high when comparing input/output power under the hard switching condition in the prior art and under the soft switching condition provided by the invention; the circuit topological structure is simple; and the zero-voltage switching quasi-resonance high-gain DC boost converter can satisfy requirements of being simple and efficient, light in weight and low in noise when compared with the improved boost DC converter under the hard switching condition in the prior art.