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Low frequency ripple propagation analysis in LLC resonant converter base on signal modulation-demodulation theory

Two stage AC-DC-DC converters are widely used in battery charge systems. While in the two stage AC-DC-DC converter system with a front-end single phase rectifier, the pulsating power which is the twice of the grid fundamental frequency will affect the DC bus voltage, which will eventually deteriorate the output voltage quality of the rear-end DC-DC converter. This paper analyzes the low frequency voltage ripple propagation in LLC DC-DC resonant converter based on signal modulation-demodulation theory. With this analytical method, the quantitative relationship between the amplitude of input and output low frequency voltage ripple is obtained. Quantitative expression obtained with the proposed analysis method is proved by experimental results with a 1kW LLC resonant converter.