Isolated full-bridge LLC double-path bidirectional DC-DC conversion circuit and charging pile

Abstract

The invention provides an isolated full-bridge LLC double-circuit bidirectional DC-DC conversion circuit and a charging pile. The circuit comprises a transformer; a first full-bridge LLC circuit, wherein one side of the first full-bridge LLC circuit is connected to the power grid, and the other side of the first full-bridge LLC circuit is connected with one side of the transformer; a second full-bridge LLC circuit, wherein one side of the second full-bridge LLC circuit is connected to the first battery pack, and the other side of the second full-bridge LLC circuit is connected with a first coil on the other side of the transformer; and a third full-bridge LLC circuit, wherein one side of the third full-bridge LLC circuit is connected to the second battery pack, and the other side of the third full-bridge LLC circuit is connected with a second coil on the other side of the transformer; each of the first to third full-bridge LLC circuits comprises an excitation unit. According to the invention, bidirectional charging and discharging between the power grid and the battery pack can be realized to realize reasonable utilization of resources, peak clipping and valley filling of the powergrid can be realized to ensure stable operation of the power grid, and the charging and discharging process of the battery pack can be well controlled to improve the effective utilization rate of thebattery pack.

Description

technical field [0001] The invention relates to the technical field of DC-DC conversion, in particular to an isolated full-bridge LLC dual-channel bidirectional DC-DC conversion circuit and a charging pile. Background technique [0002] Nowadays, the new energy electric vehicle industry is developing rapidly, and the development of the new energy electric vehicle industry is inseparable from the power supply industry. In the electric vehicle charging system, the DC-DC converter is a core component used to realize the electric energy in the grid. It is transmitted to the battery of new energy electric vehicles. However, the connection between the traditional electric vehicle and the grid is one-way, and the electric vehicle is only a load. When a large number of ordinary electric vehicles and other electrical equipment are connected to the power grid, it will inevitably impose a great burden on the power grid, making the power consumption of the power grid in a peak state, r...

AI Technical Summary

Problems solved by technology

However, the connection between the traditional electric vehicle and the grid is one-way, and the electric vehicle is only a load

When a large number of ordinary electric vehicles and other electrical equipment are connected to the power grid, it will inevitably cause a great burden on the power grid, making the power consumption of the power grid in a peak state, resulting in a greatly reduced power supply efficiency and quality

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