阅读说明：本技术 一种集成电动车辆电力转换系统 (Integrated electric vehicle power conversion system ) 是由 廖启新 王健 解超 于 2019-03-15 设计创作，主要内容包括：一种集成电动车辆电力转换系统,其特征在于,该系统具有一套驱动电机运转的多相全桥,该多相全桥至少有一相的输出点既与电机相线连接也与交流充电输入滤波器的输出点连接,有额外的桥臂与驱动电机运转的多相全桥中的若干桥臂共同构成交流充电输入全桥,用于充电时的能量转换,该额外的桥臂与驱动电机运转的多相全桥连接于同一直流母线。(The integrated electric vehicle power conversion system is characterized by comprising a set of multi-phase full bridges for driving a motor to run, wherein at least one phase output point of the multi-phase full bridge is connected with a phase line of the motor and an output point of an alternating current charging input filter, an additional bridge arm and a plurality of bridge arms in the multi-phase full bridges for driving the motor to run jointly form the alternating current charging input full bridge for energy conversion during charging, and the additional bridge arm and the multi-phase full bridges for driving the motor to run are connected to the same direct current bus.)

1. An integrated electric vehicle power conversion system having a multiphase full bridge for driving operation of a motor, the multiphase full bridge having at least one phase output connected to both the motor phase and an ac charging input filter.

2. The integrated electric vehicle power conversion system of claim 1, wherein an additional bridge arm is connected to the same dc bus as the multiphase full bridge with which the driving motor operates, and wherein the additional bridge arm and the plurality of bridge arms in the multiphase full bridge with which the driving motor operates together form an ac charging input full bridge for energy conversion during charging.

3. An integrated electric vehicle power conversion system according to claim 1, wherein the motor winding is also part of the ac charging input filter.

4. The integrated electric vehicle power conversion system of claim 1, wherein a contactor is provided between the dc bus and the battery for making or breaking a path between the dc bus and the battery.

5. An integrated electric vehicle power conversion system according to claim 1, wherein a voltage reduction circuit is provided between the dc bus and the battery to reduce the higher bus voltage to the lower battery voltage.

6. An integrated electric vehicle power conversion system according to claim 5, wherein there is a contactor between the output of the voltage reduction circuit and the battery.

7. An integrated electric vehicle power conversion system according to claim 5, wherein the voltage step-down circuit has an isolated secondary winding for charging the low voltage small battery.

Technical Field

The invention relates to an integrated electric vehicle power conversion system.

Background

In recent years, along with the development of electric automobiles, the requirements on the cost of a motor, a motor controller, a charger and a DCDC converter are higher and higher, and the aim of further reducing the cost is fulfilled by integrating and multiplexing parts of devices.

Disclosure of Invention

1) Solves the technical problem

In order to further reduce the cost of the electric automobile, the invention achieves the purpose of reducing the cost by multiplexing partial power devices of the motor, the motor controller, the charger and the DCDC converter.

2) Technical scheme

An integrated electric vehicle power conversion system having a set of multiphase full bridges that drive motor operation such as: the multi-phase full bridge has at least one phase output point connected to the phase line of the motor and the output point of the AC charging input filter.

The additional one or more bridge arms and the multi-phase full bridge operated by the driving motor jointly form an alternating current charging input full bridge for energy conversion during charging, the additional bridge arms and the multi-phase full bridge operated by the driving motor are connected to the same direct current bus, the upper and lower tubes of the bridge arms can be switching tubes or diodes, and the multi-phase full bridge operated by the driving motor can only use one of the bridge arms or can use all the bridge arms as one bridge arm.

The motor winding is also a part of the alternating current charging input filter, a connection point is led out from the central point of the motor, and a certain phase winding or all windings of the motor are used as inductors.

The motor winding can be omitted as a part of the alternating current charging input filter, an independent filter is arranged, and no matter which scheme is used, the motor does not need to be cut off when charging is carried out, so that the condition that the motor is cut off from the output end of a three-phase full bridge by using a breaker is avoided.

And a contactor is arranged between the direct current bus and the battery and used for connecting or disconnecting a passage between the direct current bus and the battery, and the passage is connected when the vehicle runs in a driving mode.

Because the circuit topology on the alternating current input side is a booster circuit, the voltage of the direct current bus is high, and when the voltage of the battery is low due to over-discharge, the battery cannot be charged, therefore, a voltage reduction circuit is arranged between the direct current bus and the battery, the high voltage of the bus is reduced to be low voltage of the storage battery, the battery is charged by the circuit with low power, and the battery is slowly brought out of an over-discharge state.

There is the contactor between this step-down circuit's output and the battery, when battery voltage was higher than the topological work requirement of circuit on the interchange input side, can break off, can charge for the battery through direct generating line this moment, and charging power is great.

The voltage reduction circuit is provided with an isolated secondary winding, and when the voltage of the battery is higher or in a driving state and the voltage reduction circuit is not required to work, the winding is used for charging a low-voltage small storage battery.

3) Advantageous effects

By adopting the scheme, more power devices can be multiplexed as much as possible, and an expensive motor is not required to be introduced to cut off the contactor, so that the cost is better.

Drawings

Fig. 1 shows an integration scheme of a multiplex motor winding as an ac input filter, and fig. 2 shows an integration scheme of a separate ac input filter.

Detailed Description

An integrated electric vehicle power conversion system having a set of multiphase full bridges that drive motor operation such as: the multi-phase full bridge has at least one phase output point connected to the phase line of the motor and the output point of the AC charging input filter.

The additional one or more bridge arms and the multi-phase full bridge operated by the driving motor jointly form an alternating current charging input full bridge for energy conversion during charging, the additional bridge arms and the multi-phase full bridge operated by the driving motor are connected to the same direct current bus, the upper and lower tubes of the bridge arms can be switching tubes or diodes, and the multi-phase full bridge operated by the driving motor can only use one of the bridge arms or can use all the bridge arms as one bridge arm.

The motor winding is also a part of the alternating current charging input filter, a connection point is led out from the central point of the motor, and a certain phase winding or all windings of the motor are used as inductors.

The motor winding can be omitted as a part of the alternating current charging input filter, an independent filter is arranged, and no matter which scheme is used, the motor does not need to be cut off when charging is carried out, so that the condition that the motor is cut off from the output end of a three-phase full bridge by using a breaker is avoided.

A contactor (S1) is arranged between the direct current bus and the battery and is used for connecting or disconnecting a path between the direct current bus and the battery and connecting the path when the vehicle runs in a driving mode.

Because the circuit topology on the alternating current input side is a booster circuit, the voltage of the direct current bus is high, and when the voltage of the battery is low due to over-discharge, the battery cannot be charged, therefore, a voltage reduction circuit is arranged between the direct current bus and the battery, the high voltage of the bus is reduced to be low voltage of the storage battery, the battery is charged by the circuit with low power, and the battery is slowly brought out of an over-discharge state.

A contactor (S2) is arranged between the output of the voltage reduction circuit and the battery, when the voltage of the battery is higher than the circuit topology working requirement of the alternating current input side, the battery can be disconnected, the battery can be charged through a direct bus at the moment, and the charging power is larger.

The voltage reduction circuit is provided with an isolated secondary winding, and when the voltage of the battery is higher or in a driving state and the voltage reduction circuit is not required to work, the winding is used for charging a low-voltage small storage battery.