Port-reuse bidirectional charger and application method thereof

Abstract

The invention discloses a port-reuse bidirectional charger and an application method thereof. The port-reuse bidirectional charger comprises a plurality of change-over switches, a rectifier, a plurality of isolated bidirectional DC / DC convertors and a charging interface, wherein the rectifier is connected with a power grid through alternating current and used for converting alternating current into direct current; the input sides of the isolated bidirectional DC / DC convertors are connected in parallel and then connected with the rectifier, and the output sides of the isolated bidirectional DC / DC convertors are connected to the charging interface through the change-over switches; a charged / discharged storage battery is connected to the charging interface, and the number and the connection mode of the output isolated bidirectional DC / DC convertors are selected by setting the on-off of the change-over switches so as to meet the charging and discharging power requirements of the storage battery. The change-over switches are arranged on the output side of the charger to realize port reusing, different numbers of chargers can be used in parallel when the power requirements are different,a circuit does not need to be redesigned, and the use is facilitated.

Description

technical field [0001] The invention relates to the fields of power electronics and electrical engineering, in particular to a port multiplexed bidirectional charger and an application method thereof. Background technique [0002] In recent years, with the rapid development of electric vehicles, there are more and more researches on chargers. Electric vehicle charging methods are generally divided into two types: AC charging and DC charging. It takes 4-5 hours to fully charge the battery of an ordinary pure electric car with AC charging, and the speed is relatively slow. The direct current charging method has the ability to charge the battery directly, and the speed is very fast, which has been widely used. However, the safety of DC chargers using non-isolated unidirectional topology cannot be guaranteed, and they can only charge electric vehicles in one direction, which limits the application space of chargers, which requires improvement of the topology of DC chargers; On...

AI Technical Summary

Problems solved by technology

However, the safety of DC chargers using non-isolated unidirectional topology cannot be guaranteed, and they can only charge electric vehicles in one direction, which limits the application space of chargers, which requires improvement of the topology of DC chargers; On the one hand, when the demand for charging power changes greatly, it is necessary to design and install multiple chargers with different power levels, which leads to low equipment utilization and serious investment waste

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