开关电源因其具有体积小、高效节能等优点而逐渐取代线性电源。成为稳压电源的发展方向。文中介绍了现有的直流开关电源的工作原理，分析了其不足之处，提出了新型的电压可调的开关电源的软硬件实现方式。在不改变电源转换电路反馈的动态性能的前提下，实现了对输出电压的可调。该电源还具有对输出的过流保护、较低的因电源温漂、时漂、元器件参数容差而造成的输出误差、较低成本、较高的输出分辨力等优点。%Because of the advantages of small size, high efficiency and energy saving, switching power supply gradually replaces linear power and becomes the development direction of the power supply. The working principle and deficiencies of the existing DC switching power supply is analyzed. And hardware and software implementation of a new switching power supply with tunable voltages are put forward. In the premise of no change of the output voltage circuit feedback dynamic performance, output voltage can be adjustable. The power has the characteristics of over-current protection for output and lower error caused by temperature drift, time drift, component parameter tolerance and lower cost, higher output resolution, etc.
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