4th China International Youth Conference on Electrical Engineering (CIYCEE 2023)

168 / 2023-10-20 10:19:08

Design and Simulation of Frequency Diversion Phase Shift Hybrid Control LLC Circuit

Clean energy; LLC resonant converter; hybrid control.

2.Power electronic technology and application > (1)、Power converter topologies and design

In recent years, with the gradual development of power electronics technology, its application in the energy side has become more and more extensive. Due to the increasing attention to environmental problems, the field of clean energy such as electric energy has ushered in a good period of its development. The LLC resonant converter that can achieve a primary-side zero voltage switch and secondary-side zero current switch in the full load range can meet the current situation of a wide output range of clean energy. This paper first introduces the principle of the converter, including the definition of soft switching, the function of the resonant network, etc. Then, the two commonly used control methods of the LLC converter, namely, frequency conversion and phase shift control, are introduced. In addition, this paper analyzes the converter through the first harmonic approximation, derives its mathematical model, and uses it to design the converter parameters in the following introduction. Finally, the simulation is carried out, and the two control modes are combined at the output voltage equal to the power supply voltage to realize the hybrid control function of frequency conversion step-up and phase shift step-down.