Motor driving-charging integrated device with 220 volt alternating current (VAC)/380VAC charging function

Abstract

The invention relates to the electromobile motor driving-charging integrating technology, aims at solving the problems that in the existing electromobile technology, a motor driving device and a vehicle-mounted high-voltage battery pack charger are independently arranged and are large in vehicle-mounted space occupation and vehicle-mounted electrical device weight and a ground large-power fast charging device is needed to be configured, and provides a motor driving-charging integrated device with a 220 volt alternating current (VAC) / 380VAC charging function. The motor driving-charging integrated device with the 220VAC / 380VAC charging function comprises a boosting / depressurizing direct current (DC) / DC conversion device, a support capacitor, a motor driving inverter bridge, a 380VAC charging conversion switch circuit and a 220VAC charging conversion switch circuit. The motor driving-charging integrated device can improve efficiency of the inverter bridge of a motor during low speed and improve efficiency of the motor during high speed; enables the inverter bridge capacity to be greatly reduced under the condition of driving an electromobile to use the motor with the same power; and can achieve fast charging of a high-voltage battery pack without using the ground large-power charging device.

Description

technical field [0001] The invention relates to the field of motor drive and battery charging, in particular to the electric vehicle motor drive-charging integration technology. Background technique [0002] At present, electric vehicle technology is developing rapidly, and the electric vehicle market is growing day by day, but the motor driver and vehicle high-voltage battery charger of electric vehicles are almost two separate devices, which wastes limited vehicle space and increases the electrical equipment of electric vehicles. acquisition cost. Moreover, the driver only works when the vehicle is running, and is idle when the vehicle is charging, and the on-board high-voltage battery charger is idle when the vehicle is running, and only works when the vehicle is charging, so the utilization rate of the two sets of devices is not high. In addition, in order to realize high-power fast charging under the condition of 380VAC, a high-power charger is necessary, but the high-...

AI Technical Summary

Problems solved by technology

[0002] At present, electric vehicle technology is developing rapidly, and the electric vehicle market is growing day by day, but the motor driver and vehicle high-voltage battery charger of electric vehicles are almost two separate devices, which wastes limited vehicle space and increases the electrical equipment of electric vehicles. acquisition cost

Moreover, the driver only works when the vehicle is running, and is idle when the vehicle is charging, and the on-board high-voltage battery charger is idle when the vehicle is running, and only works when the vehicle is charging, so the utilization rate of the two sets of devices is not high

In addition, in order to realize high-power fast charging under the condition of 380VAC, a high-power charger is necessary, but the high-power charger is large in size and heavy, and cannot be installed on the car, resulting in great restrictions on the charging places of electric vehicles. To overcome this problem, it is necessary to deploy a large number of ground chargers everywhere, which requires an extremely huge investment from the country and takes up a large amount of land area. At the same time, it still cannot meet the demand for electric vehicles in remote areas.

The above problems seriously restrict the development of electric vehicles

Images