Abstract
The electricity consumption by is continuously increasing with the development of internet technologies. Improving the power supplies efficiency of datacenter is critical for energy saving. Synchronous buck converter is widely used in datacenter as well as other applications. A method of increasing the efficiency for synchronous buck converter is add an extra auxiliary circuit to make the switches in synchronous buck converter be soft switching (i.e. ZCS, ZVS). This paper presents a simple auxiliary circuit composed of one inductor, one active switch, and two Schottky diodes for synchronous buck converter to achieve the high-side and the low-side switches be ZVS turning on and ZCS turning off. Besides, the switches in the auxiliary circuit are also soft switched. The auxiliary circuit could recycle the energy stored in the output capacitor of the high-side and low-side switches. A 48 V/12 V 100 kHz synchronous buck converter with the proposed auxiliary circuit is simulated. The simulation results show that the switches in the synchronous buck converter is soft switched. The auxiliary circuit improve the synchronous buck converter’s efficiency in the whole load range, especially for the light load range, the efficiency improvement as high as 3%.
Published Version
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