Novel PSPWM control method and system for LLC resonant converter with fixed-frequency variable structure
A resonant converter and control method technology, applied in the control/regulation system, DC power input conversion to DC power output, AC power input conversion to DC power output and other directions, can solve problems such as output voltage limitation and reduce cycle The effect of current, improving transmission efficiency, and simple control method
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[0056] Three ways of embodiment are realized as follows:
[0057] When the inverter circuit works in the fixed-frequency PWM control mode (FBLLC mode) of the half-bridge LLC structure. The switch tubes Q3 and Q4 are continuously turned off, the auxiliary switch tubes Q5 and Q6 are continuously turned on, and the input split capacitor C in1 、C in2 And switch tubes Q1, Q2, Q5, Q6 form a half-bridge LLC resonant converter. At this time, the switching frequency of the switching tube Q1 and the switching tube Q2 is always equal to the series resonance frequency, and the duty cycle of the switching tubes Q1 and Q2 can be set when working in the half-bridge mode (the set value is between 0 and 0.5), However, in order to ensure the continuity between the output voltage level and the multi-working mode switching, the embodiment of the present invention further selects reasonable parameter design to ensure the optimal effect, including setting the duty cycle of the switching tube Q1 a...
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