Electric vehicle driving and charging integrated circuit and torque elimination control method thereof

Abstract

The invention discloses an electric vehicle driving and charging integrated circuit and a torque elimination control method thereof. The electric vehicle driving and charging integrated circuit comprises a power battery, a bidirectional DC / DC converter, a four-bridge arm DC / AC converter, a three-phase motor, an auxiliary inductor, a first conversion contact switch, a second conversion contact switch, a first single-contact switch, a second single-contact switch, an alternating current interface and a control unit. The circuit only adds one auxiliary inductor to realize three-phase input charging, and has the advantages of simple motor driving control, no need of redesign of the motor and high power density. The invention further provides a torque elimination control method of the circuit. Motor torque elimination during charging is achieved through bridge arm parallel control, the inductance value of an auxiliary inductor does not need to be designed to be consistent with the equivalent inductance of a motor stator winding, and the method has the advantage of being high in robustness.

Description

technical field [0001] The invention relates to the technical field of new energy vehicle charging, in particular to an electric vehicle driving and charging integrated circuit and a torque elimination control method thereof. Background technique [0002] It is known in the industry that due to the limited battery life, the development of electric vehicles cannot do without the battery charging system. However, at present, the high-power charging piles outside the car depend on the site, and the construction cost is high, while the charger inside the car is limited by space and weight, and the power is low. On the other hand, electric vehicle drive systems are currently becoming more and more powerful. Some scholars propose to reuse the inverter of the motor drive system as the rectifier of the battery charging system, and reuse the motor winding as the charging filter inductor to construct an integrated drive and charging circuit, which can greatly reduce the volume, weigh...

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Problems solved by technology

[0003] In order to maintain static charging of electric vehicles, the torque elimination problem of the motor windings needs to be solved when the motor windings are reused as charging filter inductors. There are three main existing solutions: (1) Multi-phase motors are used. The control is complicated; (2) split winding is used, and the solution needs to lead out from the middle of the winding, and the motor structure needs to be redesigned, which will affect the performance of the motor drive; The impact is small, but the integration level is not high, and the power density needs to be improved

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