Journal
IET POWER ELECTRONICS
Volume 9, Issue 13, Pages 2522-2533Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-pel.2015.0771
Keywords
voltage control; digital control; compensation; digital filters; signal sampling; cables (electric); control engineering computing; power engineering computing; power convertors; output current estimation; digital RC filter; software simulation; voltage drop elimination; output diode; cable voltage drop compensation; accurate sampling method; constant output voltage accuracy improvement; primary-side controlled flyback converter; high precision constant voltage digital control scheme
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Funding
- National Nature Science Foundation of China [61274022]
- Qing Lan Project
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To improve the constant output voltage accuracy of primary-side controlled flyback converter, this study described a digital control scheme based on accurate sampling and cable voltage drop compensation. The voltage drops of output diode and the cable were analysed first, they were two most important factors that influence the accuracy of output voltage. Then, an accurate sampling method that can eliminate the voltage drop of the output diode was proposed. With output current estimating and digital resistance capacitance (RC) filter, the compensation of cable voltage drop was also designed. Finally, the software simulation and prototype test results verified the proposed scheme, and the constant voltage accuracy of the prototype achieved -0.6 approximate to +0.6%.
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