Proposal of a new soft-switching DC/DC converter using a synchronous rectifier circuit

摘要

Recent highly-integrated/high-speed LSIs need a low-DC voltage/high-current switching power supply. Such a switching power supply needs to use a synchronous rectifier circuit, and so a suitable circuit system for this circuit is needed. The switching power supply in this case is also required to have low-harmonic and low frequency noises, for which a double-DC/DC converter system is suitable. We now propose a new circuit system of a low-voltage/high-current DC/DC converter suitable for the double-converter system. This circuit system uses a simple circuit which ensures driving of FET in the synchronous rectifier circuit, and also soft switching of the loss-less snubber, realizing a high efficiency and low noises.