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开关电源具有效率高、体积小及稳压范围宽等优点。但由于部分电路设计以及元器件参数变化等原因,会造成稳压输出值偏离设计值过大,从而超出调整范围,笔者视这种情况为电源带负载能力过强或过弱。开关电源输出电压由U_0=U_iTc/T式确定,其稳压的实质是对脉冲占空比Tc/T进行不断调整。而对每一开关电源都有一基础占空比,即脉冲调宽电路不
Switching power supply with high efficiency, small size and wide range of voltage regulator. However, due to some circuit design and component parameters change and other reasons, will cause the regulator output deviation from the design value is too large, which is beyond the scope of adjustment, I think this situation for the power with a load capacity is too strong or too weak. Switching power supply output voltage by U_0 = U_iTc / T type to determine the essence of the regulator is the pulse duty cycle Tc / T continuously adjusted. And for each switching power supply has a basic duty cycle, the pulse width modulation circuit is not