A phase-shifted interleaved series three-level LLC resonant circuit

Abstract

The invention discloses a phase-shifted interleaved series three-level LLC resonant circuit, wherein the total input voltage of the circuit is vin, the circuit comprises an LLC resonant circuit with the same N-phase structure, and the N-phase LLC resonant circuit is connected in series; The working voltage of each phase of the LLC resonant circuit is vin / N, so as to reduce the working voltage range of the whole circuit; A LLC resonant circuit of each phase adopts a three-level mode to reduce the working voltage of the switch device in each LLC resonant circuit; Each phase LLC resonant circuitprovides a drive signal with the same phase difference for supplying energy to the load at the output of the circuit at any time. The LLC resonant circuit provides a phase difference of 360 / N degreesper phase; The working voltage of the LLC resonant circuit of each phase is vin / N; The operating voltage of each LLC resonant circuit switch is vin / 2N; The invention can effectively reduce the workingvoltage in the LLC resonant circuit of each phase and the working voltage of the open transistor in the LLC circuit, reduce the cost and improve the efficiency.

Description

technical field [0001] The invention belongs to the field of circuit design, and in particular relates to a phase-shift, interleaved, series-connected three-level LLC resonant circuit. Background technique [0002] In recent years, due to environmental pollution and the rising price of traditional energy, photovoltaic power generation technology has developed rapidly wide features. The traditional LLC resonant circuit has the advantages of simple structure, high efficiency, soft switching, etc., and has always been widely used in communication power supplies; however, the switching device of the single-phase LLC resonant circuit is directly connected to the power supply input, resulting in each switching device. The voltage stress is equal to the input voltage, so it is necessary to use switching devices with a high withstand voltage value, and switching devices with high voltage stress mean a decrease in performance and an increase in cost, resulting in a decrease in the c...

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a phase-shifted interleaved series three-level LLC resonant circuit, which can effectively reduce the operating voltage of each phase LLC resonant circuit, improve the conversion efficiency of the resonant circuit, reduce costs, and solve the traditional The problems of low performance, high cost and low conversion efficiency in the LLC circuit; the specific technical solutions are as follows:

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