Charging device, system and method
A charging device and technology to be charged, applied in charging stations, electric vehicle charging technology, electric vehicles, etc., can solve problems such as low charging efficiency, achieve the effects of reducing energy loss, improving charging efficiency, and reducing the number of times of power conversion
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no. 1 example
[0037] As mentioned in the background art, the existing electric vehicle charging pile generally includes a battery pack to achieve the function of peak-shaving and valley-filling of the power grid.
[0038] Moreover, when the battery pack is used to supply power for electric vehicles at present, the electric energy stored in the battery pack is generally converted from a small voltage to a large voltage through the DC / DC module, and output to the DC bus, and then the DC / AC module is used to convert the DC power To generate alternating current, and output the alternating current to the AC bus, and finally use the AC / DC module to convert the alternating current on the AC bus into direct current, and then charge the electric vehicle. Due to the large number of power conversions in this process, the energy loss is large and the charging efficiency is low.
[0039] In view of this, the present application provides a charging device, which uses fewer power conversion times to achie...
no. 2 example
[0082] see Figure 4 , the present application provides a charging system, the charging system includes at least two charging devices 200 described in the first embodiment, and the charging devices 200 are electrically connected.
[0083] Moreover, the charging system also includes a DC bus 250 and a first AC / DC module 260 (bidirectional AC / DC in the figure), each charging device 200 is electrically connected to the DC bus 250 (750V DC bus in the figure), and the DC bus 250 passes through The first AC / DC module 260 is connected to the power grid (330V AC in the figure).
[0084] When it is in the peak period of power consumption, the control unit 210 is used to control the power storage of the target charging device when the output power of the power storage device group 220 (shown as the ladder battery) of the target charging device is greater than or equal to the required power of the device to be charged The device group supplies power to the devices to be charged.
[008...
no. 3 example
[0092] see Figure 5 , the present application also provides a charging method, the charging method is applied to the control unit of the charging device described in the first embodiment or the second embodiment, the charging device includes a power storage equipment group, a first DC / DC module , power distribution unit, DC bus, bus power distribution unit and first AC / DC module, the first AC / DC module is connected to the grid, and the control unit is connected with the first DC / DC module, power distribution unit, DC bus and bus power respectively The distribution unit is electrically connected to the first AC / DC module, the power storage device group, the first DC / DC module and the power distribution unit module are electrically connected, the DC bus is electrically connected to the bus power distribution unit and the first AC / DC module, and the bus The power distribution unit is also electrically connected to the first DC / DC module.
[0093] The method includes:
[0094]S...
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