CN220629182U - Power conversion device, motor controller and vehicle - Google Patents

Abstract

The utility model provides power conversion equipment, a motor controller and a vehicle, and relates to the technical field of power conversion equipment, wherein the power conversion equipment comprises: a power capacitor and at least two circuit boards; the power capacitor is arranged between the two circuit boards; the circuit boards are connected through signal wires; at most one of the circuit boards is connected with the metal shell through a conductor structure, and any one of the other circuit boards is connected with the metal shell through an RC circuit or is not electrically connected with the metal shell. The utility model can avoid that the energy radiated outwards by the power capacitor influences the normal operation of the power conversion equipment in the working process of the power conversion equipment.

Description

Power conversion device, motor controller and vehicle

Technical Field

The present utility model relates to the field of power conversion devices, and more particularly, to a power conversion device, a motor controller, and a vehicle.

Background

Currently, in some power conversion devices, a power capacitor, such as a film capacitor for realizing a supporting capacitor, is often placed between different circuit boards due to space, cost and the like, and the circuit boards are further connected through signal lines and are further connected to a metal shell through conductor structures respectively, so that a closed loop DGND signal loop including a control board Digital Ground (DGND), a driving board DGND and the metal shell is formed.

In the working process of the power conversion equipment, the power capacitor needs to be repeatedly charged and discharged, so that the power capacitor is equivalent to a changed electric field, and energy radiated outwards by the changed electric field is converted into an interference signal in the closed-loop DGND signal loop after passing through the closed-loop DGND signal loop, and the interference signal can influence the normal operation of the power conversion equipment.

Therefore, how to avoid that the energy radiated outwards by the power capacitor affects the normal operation of the power conversion device during the working process of the power conversion device becomes a technical problem to be solved urgently.

Disclosure of Invention

In order to solve the technical problem that in the prior art, in the working process of power conversion equipment, energy radiated outwards by a power capacitor affects the normal operation of the power conversion equipment, the utility model provides the power conversion equipment, a motor controller and a vehicle.

The utility model provides the following technical scheme:

the present utility model provides a power conversion apparatus comprising: a power capacitor and at least two circuit boards;

the power capacitor is arranged between the two circuit boards;

the circuit boards are connected through signal wires;

at most one of the circuit boards is connected with the metal shell through a conductor structure, and any one of the other circuit boards is connected with the metal shell through an RC (Resistance-Capacitance Circuits) circuit or is not electrically connected with the metal shell.

Optionally, the at least two circuit boards include a control board and at least one drive board.

Optionally, the control board is connected with the metal shell through a conductor structure;

all the driving boards are not electrically connected with the metal shell.

Optionally, none of the control board and all of the drive boards are electrically connected to the metal shell.

Optionally, the control board is connected with the metal shell through a conductor structure;

all the driving plates are connected with the metal shell through the RC circuit.

Optionally, the control board and all the driving boards are connected with the metal shell through the RC circuit.

Optionally, the number of the driving boards is 2.

Optionally, the RC circuit comprises a capacitor and a resistor;

the capacitor and the resistor are electrically connected.

Optionally, the signal line is a deformable signal line.

The utility model also provides a motor controller, comprising: a motor controller body and a power conversion apparatus as described above;

the power conversion device is arranged on the motor controller body.

The utility model also provides a vehicle comprising: a vehicle body and a motor controller as described above;

the motor controller is disposed on the vehicle body.

According to the technical scheme, at most one circuit board in each circuit board is connected with the metal shell through the conductor structure, and any circuit board in other circuit boards is connected with the metal shell through the RC circuit or is not electrically connected with the metal shell. When any circuit board is connected with the metal shell through the RC circuit, the RC circuit can absorb energy in the corresponding closed-loop DGND signal ring, so that the energy radiated outwards by the power capacitor is prevented from being converted into an interference signal in the closed-loop DGND signal ring; and when any circuit board is not electrically connected with the metal shell, the corresponding DGND signal ring is opened, so that the energy radiated outwards by the power capacitor is prevented from being converted into an interference signal in the closed-loop DGND signal ring through the closed-loop DGND signal ring. Therefore, the two parallel technical schemes provided by the application can avoid that the energy radiated outwards by the power capacitor affects the normal operation of the power conversion equipment in the working process of the power conversion equipment.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a signal interference principle provided by the present utility model;

fig. 2 is a schematic structural diagram of a power conversion device according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a method for avoiding interference by switching off a closed-loop DGND signal loop according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of an embodiment of the present utility model for adding an RC circuit to a closed-loop DGND signal loop to avoid interference;

fig. 5 is a schematic structural diagram of a motor controller according to an embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a vehicle according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Currently, in some power conversion devices, a power capacitor, such as a film capacitor for realizing a supporting capacitor, is often placed between different circuit boards due to space, cost and the like, and the circuit boards are further connected through signal lines and are further connected to a metal shell through conductor structures respectively, so that a closed loop DGND signal loop including a control board DGND, a driving board DGND and the metal shell is formed. For example, in a dual motor controller including a film capacitor, a control board and two driving boards, the film capacitor is placed between the control board and the one driving board, the control board is connected to the two driving boards through signal lines, respectively, and the control board and the two driving boards are also connected to a metal case through conductor structures, so as to realize Digital Ground (DGND) connection of the control board and the two driving boards to the metal case. Thus, a closed loop DGND signal loop is formed which is formed from "control panel dgnd→first signal line dgnd→first drive panel dgnd→metal shell→second drive panel dgnd→second signal line dgnd→control panel DGND".

Fig. 1 is a schematic diagram of a signal interference principle provided by the present utility model. The structure of the closed-loop DGND signal coil is shown in fig. 1 (b), and the power capacitor 11 is surrounded by the closed-loop DGND signal coil 12 as shown in fig. 1 (a). In the working process of the power conversion equipment, the power capacitor needs to be repeatedly charged and discharged, so that the power capacitor is equivalent to a changed electric field, energy radiated outwards by the changed electric field is converted into an interference signal in the closed-loop DGND signal loop 12 after passing through the closed-loop DGND signal loop 12, and the interference signal easily causes the power conversion equipment to trigger protection or control imbalance, and finally, the power conversion equipment is stopped or damaged, so that the normal operation of the power conversion equipment is affected. Especially when the operating power of the power conversion device increases, the strength of the interference signal increases.

In order to avoid that energy radiated outwards by a power capacitor influences normal operation of the power conversion equipment in the working process of the power conversion equipment, the application provides the power conversion equipment, a motor controller and a vehicle. The technical scheme of the present application is described in detail below with reference to the accompanying drawings.

Fig. 2 is a schematic structural diagram of a power conversion device according to an embodiment of the present utility model. Referring to fig. 2, the present power conversion apparatus includes: a power capacitor 11 and at least two circuit boards 21.

Wherein the power capacitor 11 is arranged between two circuit boards 21.

The circuit boards 21 are connected to each other by signal lines.

At most one circuit board 21 of the respective circuit boards 21 is connected to the metal shell 22 through a conductor structure, and any one circuit board 21 of the other circuit boards 21 is connected to the metal shell 22 through an RC circuit, or is not electrically connected to the metal shell 22.

In the embodiment of the present disclosure, the power capacitor 11 may be disposed between any two circuit boards 21, or may be disposed between two circuit boards 21 specified by a circuit designer, so long as the spatial positional relationship that causes the energy radiated by the power capacitor to pass through the corresponding closed-loop DGND signal ring is within the protection scope of the present disclosure. And, the conductor structure may be a metal screw or the like, and the signal line may be a deformable, soft-textured signal line, such as a flat cable.

In the embodiment of the present disclosure, by changing the connection manner between each circuit board 21 and the metal shell 22, the energy radiated outward by the power capacitor is prevented from affecting the normal operation of the power conversion device when the power conversion device is in operation.

Specifically, at most one circuit board 21 in each circuit board 21 is connected with the metal shell 22 through a conductor structure, and any one circuit board 21 in other circuit boards 21 is connected with the metal shell 22 through an RC circuit or is not electrically connected with the metal shell 22, so as to avoid that energy radiated outwards by the power capacitor affects the normal operation of the power conversion device when the power conversion device works. When any circuit board is connected with the metal shell through the RC circuit, the RC circuit can absorb energy in the corresponding closed-loop DGND signal ring, so that energy radiated outwards by the power capacitor is attenuated in the closed-loop DGND signal ring, and interference signals are prevented from being generated in the closed-loop DGND signal ring. When any circuit board is not electrically connected with the metal shell, the corresponding DGND signal ring is opened, so that the influence on the working state of the power conversion equipment caused by the fact that energy radiated outwards by the power capacitor is converted into an interference signal in the closed-loop DGND signal ring through the corresponding closed-loop DGND signal ring is avoided.

The RC circuit is a circuit which drives a resistor and a capacitor to operate by using a voltage source and a current source. In an RC circuit, since a capacitor exists, a direct current cannot flow, both the resistor and the capacitor have an impeding effect on the current, the total impedance is determined by the resistance of the resistor and the capacitance of the capacitor, and the total impedance varies with the frequency variation of the current. In this embodiment, the RC circuit may include one capacitor and one resistor; the capacitor and the resistor are electrically connected.

As will be appreciated by those skilled in the art, since the precondition for converting the energy radiated by the power capacitor to the interference signal in the closed-loop DGND signal loop is that there is an included angle between the capacitance direction of the power capacitor and the plane of the closed-loop DGND signal loop, for example, the capacitance direction of the power capacitor is perpendicular to the plane of the closed-loop DGND signal loop, in the embodiment of the present disclosure, the capacitance direction of the power capacitor may be the capacitance direction in the precondition.

In this embodiment of the present disclosure, when the power conversion device is a motor controller, the at least two circuit boards may specifically include a control board and at least one driving board. When the motor controller is a dual motor controller, the number of driving boards is 2 (including a P1 driving board and a P3 driving board).

The connection between the control plate and the at least one drive plate, respectively, and the metal shell is illustrated below. In this connection, at most one of the circuit boards is connected to the metal shell by a conductor structure, and none of the other circuit boards is electrically connected to the metal shell.

In one specific example, the control board is connected to the metal shell by a conductor structure; all of the drive plates are not electrically connected to the metal shell.

In another specific example, the control board and all of the drive boards are not electrically connected to the metal shell.

Fig. 3 is a schematic diagram of a method for avoiding interference by cutting off a closed-loop DGND signal loop according to an embodiment of the present utility model. As shown in fig. 3, when the control board is connected with the metal shell through the conductor structure, and all the driving boards are not electrically connected with the metal shell, or when the control board and all the driving boards are not electrically connected with the metal shell, the DGND signal ring is in an open loop state, and energy radiated outwards by the power capacitor is not converted into an interference signal in the open loop DGND signal ring after passing through the open loop DGND signal ring, so that the normal operation of the power conversion device can be prevented from being influenced by the energy radiated outwards by the power capacitor in the working process of the power conversion device.

The connection between the control plate and the at least one drive plate, respectively, and the metal shell is illustrated below. In this connection, at most one of the circuit boards is connected to the metal shell through a conductor structure, and the other circuit boards are connected to the metal shell through RC circuits.

In a specific example, the control board is connected to the metal shell by a conductor structure and all of the drive boards are connected to the metal shell by an RC circuit.

In another specific example, the control board and all the drive boards are connected to the metal shell by an RC circuit.

Fig. 4 is a schematic diagram of an embodiment of the present utility model for adding an RC circuit to a closed-loop DGND signal loop to avoid interference. As shown in fig. 4, when the control board is connected with the metal shell through the conductor structure, and all the driving boards are connected with the metal shell through the RC circuit, or when the control board and all the driving boards are connected with the metal shell through the RC circuit, the energy in the corresponding closed-loop DGND signal loop can be absorbed by the RC circuit in the closed-loop DGND signal loop, so that the energy radiated outwards by the power capacitor is prevented from being converted into an interference signal in the closed-loop DGND signal loop, and the influence of the energy radiated outwards by the power capacitor on the normal operation of the power conversion device in the working process of the power conversion device can be avoided.

In the embodiment of the present disclosure, the connection between each circuit board 21 and the metal shell 22 is not limited to the above examples, and other connection between each circuit board 21 and the metal shell 22 may be used. In a specific example, the power conversion device includes a control board and two driving boards, the control board is connected to the metal shell through a conductor structure, one driving board is connected to the metal shell through an RC circuit, and the other driving board is not electrically connected to the metal shell.

In summary, the utility model avoids the influence of the energy radiated outwards at the power capacitor on the normal operation of the power conversion equipment by cutting off the closed-loop DGND signal loop or adding an RC circuit in the closed-loop DGND signal loop. The scheme of the utility model is not only suitable for the field of motor control, but also suitable for other design models with a structure that the power capacitor is arranged between two circuit boards, so that the scheme of the utility model has stronger applicability. The scheme of the utility model has the advantages of simple implementation and high reliability.

Based on the same inventive concept, the utility model also provides a motor controller. Fig. 5 is a schematic structural diagram of a motor controller according to an embodiment of the present utility model. As shown in fig. 5, the present motor controller includes: a motor controller body 51 and a power conversion device 52 as described above.

The power conversion device 52 is provided on the motor controller body 51.

Based on the same inventive concept, the utility model also provides a vehicle. Fig. 6 is a schematic structural diagram of a vehicle according to an embodiment of the present utility model. As shown in fig. 6, the host vehicle includes: a vehicle body 61 and a motor controller as described above.

The motor controller is provided on the vehicle body 61.

It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. The modules and sub-modules in the device and the terminal of the embodiments of the present utility model may be combined, divided, and deleted according to actual needs, and features described in the embodiments may be replaced or combined.

In the embodiments provided in the present utility model, it should be understood that the disclosed terminal and apparatus may be implemented in other manners. For example, the division of a module or sub-module is merely a logical function division, and there may be other manners of division when actually implemented, for example, multiple sub-modules or modules may be combined or integrated into another module, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.

The modules or sub-modules illustrated as separate components may or may not be physically separate, and components that are modules or sub-modules may or may not be physical modules or sub-modules, i.e., may be located in one place, or may be distributed over multiple network modules or sub-modules. Some or all of the modules or sub-modules may be selected according to actual needs to achieve the purpose of the embodiment.

In addition, each functional module or sub-module in the embodiments of the present utility model may be integrated in one processing module, or each module or sub-module may exist alone physically, or two or more modules or sub-modules may be integrated in one module.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in an article or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

1. A power conversion apparatus, comprising: a power capacitor and at least two circuit boards;

the power capacitor is arranged between the two circuit boards;

the circuit boards are connected through signal wires;

at most one of the circuit boards is connected with the metal shell through a conductor structure, and any one of the other circuit boards is connected with the metal shell through an RC circuit or is not electrically connected with the metal shell.

2. The power conversion apparatus of claim 1, wherein the at least two circuit boards include a control board and at least one drive board.

3. The power conversion apparatus according to claim 2, wherein the control board is connected to the metal shell by a conductor structure;

all the driving boards are not electrically connected with the metal shell.

4. The power conversion apparatus according to claim 2, wherein none of the control board and all of the drive boards are electrically connected to the metal shell.

5. The power conversion apparatus according to claim 2, wherein the control board is connected to the metal shell by a conductor structure;

all the driving plates are connected with the metal shell through the RC circuit.

6. The power conversion apparatus according to claim 2, wherein the control board and all the drive boards are connected to the metal case through the RC circuit.

7. The power conversion apparatus according to any one of claims 2 to 6, characterized in that the number of the drive boards is 2.

8. The power conversion device according to any one of claims 1 to 6, characterized in that the RC circuit comprises one capacitor and one resistor;

the capacitor and the resistor are electrically connected.

9. The power conversion apparatus according to any one of claims 1 to 6, wherein the signal line is a deformable signal line.

10. A motor controller, comprising: a motor controller body and the power conversion apparatus as claimed in any one of claims 2 to 9;

the power conversion device is arranged on the motor controller body.

11. A vehicle, characterized by comprising: a vehicle body and the motor controller according to claim 10;

the motor controller is disposed on the vehicle body.