An electric vehicle charging system controlled by intelligent frequency conversion

Abstract

The invention discloses an electric vehicle charging system controlled by intelligent frequency conversion, comprising an AC-DC rectification and filtering module, a power factor correction module, a DC-AC inverter module, an isolation transformer, a charging module, and a voltage input of the AC-DC rectification and filtering module The voltage output terminal is connected to the voltage input terminal of the DC-AC inverter module through the power factor correction module, and the voltage output terminal of the DC-AC inverter module is connected to the voltage input terminal of the charging module through an isolation transformer. The voltage output terminal is connected to the positive and negative electrodes of the electric vehicle battery; it also includes a slow start module, the input terminal of the slow start module is connected to the half-bridge output terminal of the DC-AC inverter module, and the power output terminal is connected to the half-bridge output terminal of the DC-AC inverter module. The power supply terminal of the bridge drive circuit and the slow start output terminal are connected to the slow start input terminal of the DC-AC inverter module. The invention can safely and stably charge the battery of the electric vehicle, prevent the battery from being overcharged or insufficiently charged, and prolong the service life of the battery of the electric vehicle. The invention is suitable for charging the electric vehicle in the middle.

Description

technical field [0001] The invention belongs to the field of electric vehicles, and relates to a charging system for electric vehicles, in particular to a charging system for electric vehicles controlled by intelligent frequency conversion. Background technique [0002] With the continuous increase of the number of vehicles and the increasingly serious problems of energy depletion and environmental pollution, the manufacture of vehicles that use new energy as the driving energy has become a competitive part of major vehicle manufacturers. At present, new types of electric vehicles have appeared in the vehicle sales market, including hybrid (oil-electric hybrid) and purely electric vehicles, and whether it is a hybrid vehicle or a purely electric vehicle, it depends on the electric vehicle carried by the vehicle. The car battery is the driving energy, and the use principle of the electric car battery is to convert the 220V alternating current into its own energy to provide po...

AI Technical Summary

Problems solved by technology

The charging process of electric vehicle batteries requires the use of a charging system. The charging method of the existing charging system takes a long time, and the protection of the charging process is lacking, which may easily cause overcharging or insufficient charging. Once overcharging or Insufficient charging can easily lead to failures such as shortened battery life of electric vehicles, which is a big problem for vehicles

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