Vehicle charging system and electric vehicle

Abstract

The invention provides a vehicle charging system. The system is composed of a controller, a DC / DC converter, a fuel cell and a storage battery; when the system is started, the storage battery receivesa control signal of the controller, and the fuel cell is charged through the DC / DC converter; and when the fuel cell operates normally, the fuel cell receives a control signal of the controller, thestorage battery is charged through the DC / DC converter, and the storage battery is charged in a customized mode, wherein the DC / DC converter comprises a preceding-stage circuit and a backward-stage circuit, the preceding-stage circuit is formed by connecting a bidirectional buck-boost three-phase interleaving circuit in parallel, and the backward-stage circuit is formed by a one-way phase shift full-bridge DC / DC circuit. According to the invention, the starting problem of the fuel cell is solved, the charging problem of the storage battery is solved, the generated impact problem is improved, control logic adopted in two different stages is given for a two-stage conversion structure, impact and overshoot are reduced, and the system can operate in a constant-voltage mode and can also operatein a constant-current mode.

Description

technical field [0001] The technical field of vehicle charging of the present invention relates in particular to a DC converter with low voltage and high current under high power, high step-up ratio and multi-mode. Background technique [0002] The transformation of energy production and utilization will be another great progress of human society, and will greatly benefit our future generations. With the gradual reduction of the earth's non-renewable energy sources and the increasing environmental pollution, the development of new energy sources has increasingly attracted people's attention and in-depth research. Compared with the traditional fuel-based vehicle power generation system, the new energy power generation system is not only more environmentally friendly and in line with the road of sustainable development, but also lower in cost in the long run. [0003] With the gradual progress of semiconductor power device manufacturing technology and materials, the continuou...

AI Technical Summary

Problems solved by technology

[0004] Most of the current new energy vehicles use DC charging piles to charge the battery. Due to the limited battery capacity and limited cruising range, it is necessary to provide a vehicle charging system and electric vehicles to overcome the defects of the existing technology.

Images