阅读说明：本技术 一种逆变组件及控制方法 (Inversion assembly and control method ) 是由 刘志强 文彦东 王斯博 钟华 赵慧超 于 2019-10-24 设计创作，主要内容包括：本发明提出一种逆变组件及控制方法。逆变组件用于驱动三相电机，三相电机包括第一电感、第二电感和第三电感。逆变组件包括第一三相全桥逆变电路和第二三相全桥逆变电路，第一三相全桥逆变电路包括第一半桥、第二半桥和第三半桥，第二三相全桥逆变电路包括第四半桥、第五半桥和第六半桥。第一三相全桥逆变电路、第二三相全桥逆变电路的输入端与直流电源电连接。第一半桥的输出端与第一电感的第一端电连接，第一电感的第二端与第四半桥的输出端电连接。第二半桥的输出端与第二电感的第一端电连接，第二电感的第二端与第五半桥的输出端电连接。第三半桥的输出端与第三电感的第一端电连接，第三电感的第二端与第六半桥的输出端电连接。(The invention provides an inversion assembly and a control method. The inversion component is used for driving a three-phase motor, and the three-phase motor comprises a first inductor, a second inductor and a third inductor. The contravariant subassembly includes first three-phase full-bridge inverter circuit and second three-phase full-bridge inverter circuit, and first three-phase full-bridge inverter circuit includes first half-bridge, second half-bridge and third half-bridge, and second three-phase full-bridge inverter circuit includes fourth half-bridge, fifth half-bridge and sixth half-bridge. The input ends of the first three-phase full-bridge inverter circuit and the second three-phase full-bridge inverter circuit are electrically connected with a direct current power supply. The output end of the first half-bridge is electrically connected with the first end of the first inductor, and the second end of the first inductor is electrically connected with the output end of the fourth half-bridge. The output end of the second half-bridge is electrically connected with the first end of the second inductor, and the second end of the second inductor is electrically connected with the output end of the fifth half-bridge. The output end of the third half-bridge is electrically connected with the first end of the third inductor, and the second end of the third inductor is electrically connected with the output end of the sixth half-bridge.)

1. An inverter component is used for driving a three-phase motor, the three-phase motor comprises a first inductor, a second inductor and a third inductor and is characterized by comprising a first three-phase full-bridge inverter circuit and a second three-phase full-bridge inverter circuit, the first three-phase full-bridge inverter circuit comprises a first half bridge, a second half bridge and a third half bridge, the second three-phase full-bridge inverter circuit comprises a fourth half bridge, a fifth half bridge and a sixth half bridge,

the input ends of the first three-phase full-bridge inverter circuit and the second three-phase full-bridge inverter circuit are electrically connected with a direct current power supply,

the output end of the first half bridge is electrically connected with the first end of the first inductor, and the second end of the first inductor is electrically connected with the output end of the fourth half bridge;

the output end of the second half-bridge is electrically connected with the first end of the second inductor, and the second end of the second inductor is electrically connected with the output end of the fifth half-bridge;

the output end of the third half-bridge is electrically connected with the first end of the third inductor, and the second end of the third inductor is electrically connected with the output end of the sixth half-bridge.

2. The inverter assembly of claim 1, further comprising a control unit and a drive unit,

the control unit with the three-phase motor and the drive unit electricity is connected, the drive unit with first three-phase full-bridge inverter circuit and second three-phase full-bridge inverter circuit electricity is connected.

3. The inverter assembly of claim 2, further comprising a first switch and a second switch,

a second end of the first inductor is electrically connected with an output end of the sixth half-bridge and an output end of the fourth half-bridge through the first switch; a second end of the third inductor is electrically connected with the output end of the sixth half-bridge and the output end of the fourth half-bridge through the second switch;

and the control ends of the first switch and the second switch are electrically connected with the control unit.

4. The inverting assembly of claim 2, further comprising a third switch, a fourth switch, a fifth switch, and a sixth switch,

the third switch is electrically connected with the first end of the first inductor and the first end of the second inductor; the fourth switch is electrically connected with the first end of the second inductor and the first end of the third inductor; the fifth switch is electrically connected with the second end of the first inductor and the second end of the second inductor; the sixth switch is electrically connected with the second end of the second inductor and the second end of the third inductor,

and the control ends of the third switch, the fourth switch, the fifth switch and the sixth switch are electrically connected with the control unit.

5. The inverter assembly of claim 1, wherein the types of transistors used in the first three-phase full-bridge inverter circuit and the second three-phase full-bridge inverter circuit are the same.

6. A control method of an inverter module, which is used for controlling the inverter module in embodiment 1, the method comprising:

reading the rotating speed of the three-phase motor;

and when the rotating speed is greater than or equal to the preset rotating speed, controlling the first three-phase full-bridge inverter circuit or the second three-phase full-bridge inverter circuit to invert.

7. The control method according to claim 6, wherein the inverting component comprises a first switch and a second switch, and a second end of the first inductor is electrically connected to the output end of the sixth half-bridge and then electrically connected to the output end of the fourth half-bridge through the first switch; the second end of the third inductor is electrically connected with the output end of the sixth half-bridge and then electrically connected with the output end of the fourth half-bridge through the second switch,

when the rotating speed is smaller than the preset rotating speed, the first switch is controlled to be switched off, the second switch is controlled to be switched on, and the first three-phase full-bridge inverter circuit and the second three-phase full-bridge inverter circuit are controlled to invert.

8. The control method according to claim 6,

when the rotational speed is greater than or equal to predetermine the rotational speed, control first three-phase full-bridge inverter circuit or second three-phase full-bridge inverter circuit and carry out the contravariant and include:

controlling the conduction of the first triode, the second triode and the third triode and controlling the inversion of the first three-phase full-bridge inverter circuit;

the fourth half-bridge comprises the first triode, and the first end of the first triode is electrically connected with the positive electrode of the direct-current power supply; the fifth half-bridge comprises the second triode, and the first end of the second triode is electrically connected with the positive electrode of the direct-current power supply; the sixth half-bridge comprises the third triode, and the first end of the third triode is electrically connected with the positive electrode of the direct current power supply.

9. The control method of claim 6, the inverting component comprising a third switch, a fourth switch, a fifth switch, and a sixth switch,

when the rotational speed is greater than or equal to predetermine the rotational speed, control first three-phase full-bridge inverter circuit or second three-phase full-bridge inverter circuit and carry out the contravariant and include:

the third switch and the fourth switch are controlled to be closed, the second three-phase full-bridge inverter circuit is controlled to invert,

or the fifth switch and the sixth switch are controlled to be closed, and the first three-phase full-bridge inverter circuit is controlled to invert.

10. The control method according to claim 9,

detecting whether the first three-phase full-bridge inverter circuit and the second three-phase full-bridge inverter circuit have open-circuit faults or not;

if the first three-phase full-bridge inverter circuit has an open-circuit fault, controlling the third switch and the fourth switch to be closed;

and if the second three-phase full-bridge inverter circuit has an open-circuit fault, controlling the fifth switch and the sixth switch to be switched on and off.

Technical Field

The embodiment of the invention relates to a motor driving technology, in particular to an inverter assembly and a control method.

Background

New energy vehicles such as electric vehicles have the characteristics of energy conservation, low emission and even zero emission, so the new energy vehicles are popularized to the utmost extent by the nation and can be developed rapidly. The motor and the driving system are used as a core assembly of the electric vehicle, and the key attributes of the whole vehicle such as dynamic property, safety, economy and the like are influenced by the characteristics of the motor and the driving system. At present, the requirements of electric vehicles on compactness and low cost are increased year by year, the high speed and high voltage of a motor gradually become a trend, but the performance of high-voltage components of the whole vehicle is also improved while the voltage of a battery platform is improved.

Because vehicle high-voltage components, such as a DC/DC module, a charger and the like, are mostly conventional high-voltage platforms, such as 350V or 410V, and cannot meet the higher voltage requirements of 700V and the like, in order to meet the high-voltage requirements of the motor, the voltage needs to be increased to the working voltage requirement of the high-voltage motor, and the high voltage is used for driving the motor to run at high voltage. In the prior art, in order to meet the boosting requirement, a cascade boost converter at the front stage of the inverter is mostly adopted, but power devices required in the boost inverter need to select high-voltage-resistant devices, so that the design is complex and the cost is high.

Disclosure of Invention

The invention provides an inverter assembly and a control method, which are used for realizing boosting inversion under the condition of not using a high-voltage-resistant device.

In a first aspect, an embodiment of the present invention provides an inverter assembly, configured to drive a three-phase motor, where the three-phase motor includes a first inductor, a second inductor, and a third inductor, and is characterized by including a first three-phase full-bridge inverter circuit and a second three-phase full-bridge inverter circuit, where the first three-phase full-bridge inverter circuit includes a first half-bridge, a second half-bridge, and a third half-bridge, the second three-phase full-bridge inverter circuit includes a fourth half-bridge, a fifth half-bridge, and a sixth half-bridge, an input end of the first three-phase full-bridge inverter circuit and an input end of the second three-phase full-bridge inverter circuit are electrically connected to a dc power supply, an output end of the first half-bridge is electrically connected to a first end of the first inductor, and a second end of the; the output end of the second half-bridge is electrically connected with the first end of the second inductor, and the second end of the second inductor is electrically connected with the output end of the fifth half-bridge; the output end of the third half-bridge is electrically connected with the first end of the third inductor, and the second end of the third inductor is electrically connected with the output end of the sixth half-bridge.

In a second aspect, an embodiment of the present invention provides an inverter assembly for controlling the inverter assembly according to the embodiment of the present invention, including:

reading the rotating speed of the three-phase motor;

and when the rotating speed is greater than or equal to the preset rotating speed, controlling the first three-phase full-bridge inverter circuit or the second three-phase full-bridge inverter circuit to invert.

Compared with the prior art, the invention has the beneficial effects that: the two sets of three-phase full-bridge inverter circuits can work independently, and in an independent working mode, the inverter component can still realize inversion unless the two sets of three-phase full-bridge inverter circuits are completely damaged, so that the motor driving system with the component has higher reliability. Meanwhile, the inversion component provided by the invention also has a mode that two sets of three-phase full-bridge inversion circuits work simultaneously so as to improve the output voltage, and in the mode, the power device in each set of three-phase full-bridge inversion circuit only bears the voltage of the high-voltage battery connected with the direct-current input end of the power device, so that although the output voltage of the inversion component is increased, the voltage borne by the power device in each set of three-phase full-bridge inversion circuit is not changed, and therefore, the power device in the inversion component provided by the invention does not need to select a high-voltage-resistant device. The inversion assembly provided by the invention has high reliability and is easy to realize the platform.

Drawings

Fig. 1 is a schematic structural diagram of an inverter assembly according to a first embodiment;

FIG. 2 is a schematic structural diagram of another inverter assembly according to the first embodiment;

FIG. 3 is a schematic structural diagram of another inverter assembly according to the first embodiment;

fig. 4 is a flowchart of an inversion control method according to a second embodiment.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.