基于LD7552B的绿色开关电源设计与分析

摘要

In order to reduce energy consumption, simplify the circuit and save cost, a scheme of LD7552B switching power is proposed. The LD7552B is a green power chip,which has a great improvement at the start-up, regulator, protection and energy saving compared with the traditional power. An energy-saving switching power can be constituted matching the LD7552B with switch MOSFET, precision three-terminal regulator and switch transformer components. Experimental results show that the LD7552B switching power has a stable work in 90~240V communication environment, whose circuit efficiency can reach 90 ％ , and can change the work mode automatically according to size of the load (in normal mode and green mode between transform). The switching power based on the LD7552B is a high-performance switching power supply.%为了降低能耗,同时又能简化电路,节省成本,提出了LD7552B开关电源方案,用LD7552B设计了一种绿色开关电源.LD7552B是一种绿色电源芯片,它在启动方面、稳压方面、保护方面及节能方面都较传统电源有很大的改善,采用LD7552B与开关场效应管、精密三端稳压器、开关变压器等元件配合,就能构成节能型开关电源.实验结果表明,LD7552B开关电源能在90～240 V交流环境中稳定工作,电路效率可达90%以上,且能根据负载的大小自动改变工作模式(在正常模式与绿色模式之间变换).基于LD7552B的开关电源有着传统开关电源无法比拟的优势,是一种值得推广的高性能开关电源.