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Design of switching power supply with high performance based on active and closed-loop control technique |
School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China)
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Abstract On the basis of active control technology in non-linear system, a sync rectifier Flyback DC/DC converter was taken as the main circuit. A series of effective measures of dual closed-loop control to reduce the power consumption and restrain the harmonic components were adopted. A kind of APFC switching power supply was designed. Several circuit experiments were carried out. The experimental results show that the operation of the designed APFC supply is stable, and its power factor reaches 0. 932 - 0. 999 with the supply working within the normal range, quite close to the unity power factor. Moreover, the efficiency of the whole supply reaches 85.8% - 88.7%, the output-ripple voltage of the supply is about 3 V at high-frequency and about 9.8 V at low-frequency 100 Hz. The total harmonic voltage distortion is below 3. 65%, reaching the level of lower harmonic pollution. With these characteristics, the designed APFC switching power supply is especially suitable for the "green power supply" of the middle and small power installations.
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