Digital switching power source with high light-load efficiency

Abstract

The invention discloses a digital switching power source with high light-load efficiency. The digital switching power source comprises an alternating current input power source, an EMI filter, a rectifier bridge, a pre PFC correcting circuit, a transformer, a post DC / DC conversion circuit, a sampling circuit, a first drive circuit, a second drive circuit, a first DSC and a second DSC. The light-load efficiency is improved by reducing the switching loss of a MOS pipe in the pre PFC correcting circuit, the switching loss of a MOS pipe in the post DC / DC conversion circuit and the magnetic core loss of an inductor on the condition of light loads. Compared with other methods for improving light-load efficiency, no additional circuit is needed, and the purpose of improving the high-load efficiency of the power source can be achieved only by using an original control circuit and simply changing relates control strategies; therefore, the digital switching power source is high in light-load efficiency, simple in structure, low in cost and good in reliability.

Description

technical field [0001] The invention belongs to the technical field of digital switching power supplies, in particular to a digital switching power supply with high light-load efficiency. Background technique [0002] With the rapid development of power electronics technology, the requirements of electronic equipment for power supply are also increasing day by day. Especially for systems that require high stability, such as servers in data centers, the requirements for power supplies are more stringent. In order to ensure the reliability of the system, these server power supplies often operate under light load conditions. Therefore, light load efficiency is an important indicator for server power supplies. [0003] The topology of the server power supply consists of two parts: the front-end PFC topology and the back-end DC / DC converter. The input of this power supply is generally 176VAC-264VAC, alternating current with a frequency of 45-55Hz, and the output is direct curre...

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problems of low light-load efficiency, poor reliability, and high cost existing in the existing server power supply, and provide a digital switching power supply with high light-load efficiency. Boost topology, the post-stage DC / DC conversion circuit adopts a phase-shifted full-bridge synchronous current doubler rectifier circuit, and two high-performance digital signal controllers DSC are used to control the power supply, so that the power supply has high light-load efficiency and high Reliable and low cost

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