Abstract
Two-stage AC-DC-DC converters are widely used in battery charge systems. While in a single-phase two-stage AC-DC-DC converter system, the pulsating power which is twice of the grid's fundamental frequency will affect the DC bus voltage, which will eventually deteriorate the quality of output voltage. This paper analyzed the propagation of low frequency voltage ripple in LLC DC-DC resonant converter based on signal modulation-demodulation theory and quantitative relationship between the amplitude of input and output low frequency ripple voltage was obtained. A PIR controller was designed to reduce the output low frequency voltage ripple. Experimental results with a 1kW prototype verified the accuracy of the obtained quantitative expression and the designed PIR controller can reduce 76.7% 100Hz ripple voltage at output side of LLC resonant converter <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">.</sup>
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