A kind of fast charging device and method for vehicle-mounted energy storage unit

Abstract

The invention discloses a fast charging device for a vehicle-mounted energy storage unit. The engine shaft of the vehicle engine is connected to one end of the main generator shaft of the main generator, and the other end of the main generator shaft is connected to the auxiliary generator through a gearbox; The voltage output terminal of the generator is connected to the energy storage unit through the rectification circuit; the sensor unit collects the temperature signal of the main generator and the energy storage unit, as well as the voltage and current signal output by the rectification circuit, and outputs the collected signal to the excitation regulator; the excitation The two control signal output terminals of the regulator are respectively connected to the control signal input terminals of the main generator and the auxiliary generator. The invention also discloses a fast charging method for the vehicle-mounted energy storage unit. The invention provides different charging modes under parking and driving conditions, realizes the excitation regulation of the generator system and the monitoring of the motor temperature on the basis of ensuring the charging power and electric energy quality, and contributes to the control of the charging process.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to a fast charging device for a vehicle-mounted energy storage unit and a control method thereof. Background technique [0002] In recent years, with the development of the economy and society, the fast charging device of the vehicle-mounted energy storage unit has been widely used in practical situations such as emergency rescue and disaster relief, mobile communication guarantee and maintenance, field scientific investigation, etc., which can effectively support the national economic construction and people's livelihood security. [0003] Regarding the power source of fast charging devices, at present, there have been a lot of researches on charging piles for electric vehicles and they have begun to be put into commercial application. However, charging piles are not mobile, and will lose their Charging effect. In their patent, Wang Yuchuan and others mentioned ...

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Problems solved by technology

[0004] A large number of scholars have carried out extensive research on the topology of the charging device. In 2014, Fan Yongqiang from North China Electric Power University and others proposed a single-three-phase bridge fully-controlled rectifier plus DC / DC converter charging for the on-board supercapacitor. Compared with uncontrolled rectification, this method can obtain smaller current harmonics and higher power quality, but its control method is relatively complicated, the power level is not high, the charging time is slow, and the economic cost is high. Less reliable in extreme applications

In 2017, Lu Zhengyu of Zhejiang University and others proposed a current-type variable topology multi-pulse rectifier as the power circuit topology of the charging device. It needs to switch between different topology modes, and its charging process is complicated to control and the power level is not high enough.

At present, the charging mode adopted in most literatures is relatively single, and there is no charging mode switching according to different application occasions, which makes the charging process not adaptable to the vehicle running state and the state of the energy storage unit.

[0005] From the analysis of the above documents, it can be seen that there are still many shortcomings in the fast charging device of the vehicle-mounted energy storage unit. The development of a fast charging device with simple control method, fast charging speed and high power level is of great significance to the development of the national economy.

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