Vehicle-mounted charging system of electric vehicle

A technology for on-board charging and electric vehicles, which is applied in electric vehicle charging technology, electric vehicles, charging stations, etc., can solve the problems of complex charger structure, high production cost, complex structure, etc., and achieve excellent output performance, low production cost, Small size effect

CN112440754APending Publication Date: 2021-03-05CITY UNIVERSITY OF HONG KONG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-03-05

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Abstract

The invention discloses a vehicle-mounted charging system of an electric vehicle. The system comprises a three-phase power supply, a first three-phase motor, a first three-phase inverter, a second three-phase inverter, a second three-phase motor, a battery pack, a first contactor, a second contactor, a third contactor and a fourth contactor which are sequentially connected in series. The three-phase power supply comprises an upper power supply, a middle power supply and a lower power supply, and the first three-phase motor comprises an upper winding, a middle winding and a lower winding. One end of the first contactor is connected with the upper winding, and the other end is connected with an upper power supply or the middle winding. One end of the second contactor is connected with the middle winding, and the other end is connected with a middle power supply or the lower winding. One end of the third contactor is connected with the lower power supply, and the other end is connected with the lower winding. And one end of the fourth contactor is connected with the battery pack, and the other end is connected with the second three-phase motor or the second three-phase inverter. Charging operation can be completed without additionally arranging an inductor, the structure is simple, the size is small, and the production cost is low.
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Description

technical field

[0001] The invention relates to the field of electric vehicles, in particular to a vehicle-mounted charging system for electric vehicles. Background technique

[0002] With the reduction of fossil fuels and the intensification of environmental problems, the global demand for clean and efficient energy is increasing. Compared with traditional fuel vehicles, electric vehicles have the characteristics of low emission and high energy conversion rate, and have become an important direction for the development of the automotive industry. At present, electric vehicles generally use an inverter to drive the motor, that is, the high-voltage direct current output by the battery pack is converted into three-phase AC by the inverter and output to the motor.

[0003] The chargers in the prior art generally include: a bidirectional DC converter, a control circuit, an inductor, etc. During operation, some components of the inverter are used to form a rectifier, and an addi...

Examples

Embodiment Construction

[0055] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0056] An embodiment of the present invention provides an electric vehicle on-board charging system, such as the attached figure 1 As shown, the system includes: a three-phase power supply 1 connected in series, a first three-phase motor 2, a first three-phase inverter 3, a second three-phase inverter 4, a second three-phase motor 5, and a battery pack 6. The first contactor 7 , the second contactor 8 , the third contactor 9 , and the fourth contactor 10 . Wherein, the three-phase power supply 1 includes an upper power supply 101 , a middle power supply 102 and a low...