Isolated and hybrid modulated three-path output DC/DC converter based on three-phase LLC resonance circuit and phase-shifted full-bridge circuit

Abstract

The invention discloses an isolated and hybrid modulated three-path output DC / DC converter based on a three-phase LLC resonance circuit and a phase-shifted full-bridge circuit. The isolated and hybridmodulated three-path output DC / DC converter comprises an input power source, the three-phase LLC resonance circuit and the phase-shifted full-bridge circuit. A frequency modulation mode is adopted totransform direct-current input voltage into high-direct-current output voltage, and a full-wave rectification circuit structure is arranged at the auxiliary side; the phase-shifted full-bridge circuit comprises a first branch circuit and a second branch circuit, the first branch circuit is connected between a first bridge arm and a second bridge arm of a parallel-connection full-bridge LLC resonance circuit, and the phase mode of adjusting the two bridge arms is adopted to transform the direct current input voltage into first low-direct-current output voltage; the second branch circuit is connected between the second bridge arm and a third bridge arm of the parallel-connection full-bridge LLC resonance circuit, and the phase mode of adjusting the two bridge arms is adopted to transform the direct current input voltage into second low-direct-current output voltage; a full-wave rectification circuit structure is arranged at the auxiliary side. The isolated and hybrid modulated three-path output DC / DC converter has the advantages of having electrical isolation, low cost and high efficiency and the like.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to an isolated mixed modulation three-way output DC-DC converter based on a three-phase LLC resonant circuit and a phase-shifted full-bridge circuit. Background technique [0002] With the development of modern technology, many new types of electrical equipment have higher and higher requirements for power supply. Many electrical equipment require multiple DC voltages for power supply during operation. To ensure the reliability and independence of power supply, each DC voltage is required. Voltages are isolated from each other. For example, in an electric vehicle, while charging the power battery, it is necessary to simultaneously supply power to other devices on the vehicle. In traditional converters, multiple converters are used to supply power to electrical equipment, which will increase the cost and volume of the system, and is not conducive to the integration of eq...

AI Technical Summary

Problems solved by technology

This technical content can easily realize soft switching and improve efficiency, but it does not realize mutual independence and isolation between outputs.

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