CN215934693U - Electric energy conversion device - Google Patents

Abstract

An electric energy conversion device comprises a case, a power single board, an inversion single board, a radiator and a fan, wherein the power single board, the inversion single board, the radiator and the fan are arranged in the case; a partition board which divides the internal space of the case into an upper layer and a lower layer is arranged in the case, the power single board is arranged in the upper layer space above the partition board, and the inversion single board, the radiator and the fan are arranged in the lower layer space below the partition board; the power veneer comprises a first PCB substrate, wherein the first PCB substrate is provided with: the power supply comprises a first power unit, a second power unit, a third power unit, a main control board mounting position for mounting a main control board, an energy storage capacitor bank and a resonant capacitor. The utility model adopts reasonable layout, has good heat dissipation effect, is beneficial to prolonging the service life of the device and reducing the use and maintenance cost.

Description

Electric energy conversion device

Technical Field

The utility model belongs to the technical field of power electronics, and particularly relates to an electric energy conversion device.

Background

The electric energy conversion device can monitor the load current in real time through an external current sensor, then controls the PWM signal generator to send a control signal to an internal Insulated Gate Bipolar Transistor (IGBT) according to a set value by analyzing the reactive content, the harmonic content and the unbalanced content of the load current, so that the electric energy conversion device generates reactive compensation current, harmonic current and unbalanced current meeting requirements, and finally achieves the purposes of dynamic reactive compensation, harmonic management and unbalanced regulation. The inside electronic device of electric energy conversion device is many, has the different functional module of several, but the internally mounted space is limited, how through the reasonable layout design to the device, guarantees the heat dissipation of each module and the fastness of electronic device installation on the veneer to satisfy the device in the demand in aspects such as vibration, heat dissipation, reach extension device life's purpose, be one of the problem that needs to solve of each firm at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an electric energy conversion device which has a good heat dissipation effect and is beneficial to prolonging the service life of a device.

In order to achieve the purpose, the utility model adopts the following technical solutions:

an electric energy conversion device comprises a case, a power single board, an inversion single board, a radiator and a fan, wherein the power single board, the inversion single board, the radiator and the fan are arranged in the case; a partition board which divides the internal space of the case into an upper layer and a lower layer is arranged in the case, the power single board is arranged in the upper layer space above the partition board, and the inversion single board, the radiator and the fan are arranged in the lower layer space below the partition board; the power veneer comprises a first PCB substrate, wherein the first PCB substrate is provided with: the power supply comprises a first power unit, a second power unit, a third power unit, a main control board mounting position for mounting a main control board, an energy storage capacitor bank and a resonant capacitor.

Further, the first power unit, the second power unit and the third power unit each include: an insulated gate bipolar transistor; the isolation driving board receives the modulation signal of the main control board and outputs the modulation signal to the insulated gate bipolar transistor; a current detection element connected to the current path of the insulated gate bipolar transistor; a relay for protecting the insulated gate bipolar transistor; and the resonant capacitor is used for forming the LCL resonant circuit.

Further, still be provided with on the first PCB base plate: the incoming line terminal is connected with a power grid line and is connected with the first power unit, the second power unit and the third power unit through fuses; the external current transformer converts the sensed external current signal into a voltage signal and outputs the voltage signal to the main control board.

Further, the isolation drive board, the current detection element, the relay and the resonant capacitor are mounted on a first surface of the first PCB substrate, the insulated gate bipolar transistor is mounted on a second surface of the first PCB substrate, and the heat sink is mounted on the second surface of the first PCB substrate and used for dissipating heat of the insulated gate bipolar transistor.

Furthermore, the fans are arranged in the lower layer space and the upper layer space of the case, and a fan power supply and fault detection interface is arranged on the first PCB substrate.

Furthermore, the number of the insulated gate bipolar transistor, the isolation driving board, the current detection element, the relay and the resonant capacitor is more than one.

Further, the energy storage capacitor bank is composed of a plurality of direct current capacitors.

Furthermore, an intelligent display module is further arranged on the first PCB substrate.

Furthermore, the intelligent display module is a touch display module with a wireless communication function.

Further, the first power unit, the second power unit and the third power unit further include absorption capacitors disposed on the first PCB substrate.

Further, the inverter board includes a second PCB substrate and an inductor disposed on the second PCB substrate, and the inductor and the resonant capacitor form an LCL resonant circuit.

According to the technical scheme, the partition plate is arranged in the case of the electric energy conversion device, the internal space of the case is divided into an upper layer and a lower layer through the partition plate, the upper layer is the low-heat part, the power single plate is arranged in the upper layer space, so that the electronic devices with the service lives sensitive to temperature, such as the main control plate, the drive plate and the capacitor, can work in a low-temperature environment to prolong the service life of the devices, the lower layer is the high-heat part, a good heat dissipation channel can be formed, and the problems of poor heat dissipation, high later-stage use cost and high maintenance cost of the electric energy conversion device are solved through reasonable device layout. In the preferred technical scheme, power unit devices such as an external current transformer, a fuse, an energy storage capacitor group, a relay and an IGBT are integrated on a power single board, the integration level is high, and one single board realizes the functions of several single boards in the prior art, so that the problems that the connection between different single boards is high in flatness requirement on the positions of the single boards and not firm in connection can be avoided, the design difficulty and the manufacturing process precision requirement of a product are reduced, and the service life of an electronic device is prolonged.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.

Fig. 1 is a schematic structural view of an electric energy conversion device according to embodiment 1 of the present invention;

fig. 2 is a side view of a power board according to embodiment 1 of the present invention;

fig. 3 is a schematic plan layout diagram of a power board in embodiment 1 of the present invention;

FIG. 4 is a side view of an inversion baffle of example 1 of the present invention;

fig. 5 is a schematic plan layout view of an upper space in a chassis according to embodiment 2 of the present invention;

fig. 6 is a schematic structural diagram of an electric energy conversion device according to embodiment 2 of the present invention.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Detailed Description

The utility model will be described in detail below with reference to the accompanying drawings, wherein for the purpose of illustrating embodiments of the utility model, the drawings showing the structure of the device are not to scale but are partly enlarged, and the schematic drawings are only examples, and should not be construed as limiting the scope of the utility model. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is provided solely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

Example 1

As shown in fig. 1, the electric energy conversion device of the present embodiment includes a case 1, and a partition plate 2, a power board 3, an inverter board 4, a radiator 5, and a fan 6 disposed in the case 1. The partition board 2 divides the space in the case 1 into two mutually independent spaces of an upper low-temperature area and a lower high-temperature area. The power single board 3 is arranged in the upper layer space in the case 1, and the inversion single board 4, the radiator 5 and the fan 6 are arranged in the lower layer space in the case 1. The fan 6 is arranged at an air inlet on the side wall of the case 1, and sucks external air into the case 1 to exchange heat for the electronic device.

As shown in fig. 2 and fig. 3, the power single board 3 of the present embodiment includes a first PCB substrate 3-1, and a first power unit a, a second power unit B, and a third power unit C are disposed on the first PCB substrate 3-1, where each power unit includes an Insulated Gate Bipolar Transistor (IGBT)3-2, an isolation driving board 3-3, a current detection element 3-4, a relay 3-5, and a resonant capacitor 3-6. The number of each electronic device in the power unit can be set according to the power to be achieved, for example, when the power is P, the number of the electronic devices can be set to 2, and the power unit comprises 2 insulated gate bipolar transistors 3-2, 2 isolation driving boards 3-3, 2 current detection elements 3-4, 2 relays 3-5 and 2 resonant capacitors 3-6; if the power is P/2, the number of the aforementioned electronic devices can be set to 1. Therefore, the consistency of the size of the product, components and the like can be kept under the condition of meeting the power requirements of different customers, the batch generation and the test of the product are facilitated, and the cost in the aspects of production, material purchase and the like is saved.

The current detecting elements 3-4 of the present embodiment employ current transformers. The insulated gate bipolar transistor 3-2 and other electronic devices in the power unit are respectively mounted on different surfaces in the first PCB substrate 3-1, such as the isolation driving board 3-3, the current detection element 3-4, the relay 3-5 and the resonant capacitor 3-6 are mounted on the upper surface (first surface) of the first PCB substrate 3-1, and the insulated gate bipolar transistor 3-2 is mounted on the lower surface (second surface) of the first PCB substrate 3-1, so as to conveniently arrange the heat sink 5. The heat sink 5 is disposed at a position of the insulated gate bipolar transistor 3-2 on the lower surface of the first PCB substrate 3-1, and is configured to dissipate heat of the insulated gate bipolar transistor 3-2.

The relay 3-5 in the power unit is used for protecting the insulated gate bipolar transistor 3-2 from being impacted by large current during power-on and operation. The isolation driving board 3-3 is used for receiving the pulse modulation signal PWM provided by the main control board, amplifying and isolating the signal through a circuit and outputting the signal to the insulated gate bipolar transistor 3-2, and controlling the switching action of the insulated gate bipolar transistor 3-2. The resonance capacitors 3-6 are used for forming an LCL resonance circuit with the inductor on the inversion single board 4 and filtering high-frequency ripples output by the electric energy conversion device. The current detection element 3-4 is connected to the current path of the insulated gate bipolar transistor 3-2. As a preferred embodiment of the utility model, the power unit can further comprise a absorption capacitor 3-7, and the absorption capacitor 3-7 is used for absorbing the peak voltage generated by the insulated gate bipolar transistor 3-2 in the switching process and avoiding the damage of the insulated gate bipolar transistor 3-2. The number of absorption capacitors 3-7 can also be set to 1 or 2, respectively, depending on the power.

An energy storage capacitor group consisting of a plurality of direct current capacitors 3-8 is further arranged on the first PCB substrate 3-1, and the energy storage capacitor group is used for storing energy, achieving the purpose of stabilizing direct current voltage and providing a path for the alternating flow of four-phase current (A, B, C, N phases). In order to protect the power units, fuses 3-9 are further integrated on the first PCB substrate 3-1, the fuses 3-9 are located between each power unit (relay) and the corresponding incoming line terminals 3-10, and when the current abnormally rises to a certain height and heat (when a large current flows through or is impacted by a large current on the power single board), the fuses 3-9 can cut off the current and disconnect the connection between the electric energy conversion device and the power grid, so that the purpose of protecting rear-end components is achieved, and the device is prevented from being damaged. The incoming line terminals 3-10 are arranged at the connection positions of the three-phase power and are used for being connected with A, B, C, N, PE phase lines of a power grid to achieve a power supply function, and the electric energy conversion device is connected with the power grid through the incoming line terminals 3-10.

In this embodiment, the first PCB substrate 3-1 is further integrated with an external current transformer 3-11 and a current mutual inductance connection terminal 3-12, and the current mutual inductance connection terminal 3-12 is used for accessing an external current signal, so that the external current transformer 3-11 can detect a current signal of an external power grid, convert the current signal into a voltage signal, and output the voltage signal to a main control board (not shown). A main control board mounting position 3-13 for mounting a main control board is arranged on the first PCB substrate 3-1. The first PCB substrate 3-1 is further provided with a connection terminal (not numbered) for electrically connecting with other functional boards. As another preferred embodiment of the present invention, the first PCB substrate 3-1 is further provided with an intelligent display module 3-14, the intelligent display module 3-14 is used for implementing a human-computer interaction function of the power conversion device, and the intelligent display module 3-14 can adopt a touch display module and integrate a wireless communication function, so that the power conversion device can display various data and working states, and can also perform remote communication, implement functions of real-time data transmission, online data detection, online remote control device, fault alarm prompt, and the like, and improve the intelligence level of the power conversion device.

As shown in fig. 4, the inverter board 4 of this embodiment includes a second PCB substrate 4-1 and a plurality of inductors 4-2 disposed on the second PCB substrate 4-1, where the inductors 4-2 are used to form an LCL resonant circuit with the resonant capacitors 3-6 disposed on the first PCB substrate 3-1. The utility model arranges capacitance components such as a resonance capacitor 3-6, an absorption capacitor 3-7 and a direct current capacitor 3-8 in the LCL resonance circuit on a first PCB substrate 3-1 and is arranged in an upper layer space in a case 1, and the reason is that: the capacitor is an electronic device with a service life sensitive to temperature, the case 1 is divided into an upper space and a lower space through the partition board 2, the radiator 5 and the fan 6 are arranged in the lower space, due to the heat exchange effect of air, the air temperature passing through the radiator 5 is high, the working temperature of the lower space is at least higher than 30 ℃ compared with that of the upper space, the electronic device with the service life sensitive to temperature is placed in the high-temperature working environment of the lower space, the service life of the electronic device can be shortened, the thermal breakdown of the capacitor or the bulging phenomenon of the capacitor can be caused, potential safety hazards are brought to the whole device, if the working temperature of the electrolytic capacitor is 10 ℃ every time, and the service life of the capacitor is reduced by one time. Therefore, the capacitor and some components with the service life sensitive to temperature are placed in the upper-layer space (low-temperature region), compared with the components placed in the lower-layer high-temperature region, the working environment temperature of the electronic device (such as the capacitor) sensitive to temperature is guaranteed, the service life of the electronic device is prolonged, and the life cycle of the device is further prolonged. The inverter single board 4 and the power single board 3 of this embodiment are connected through a copper stud 7.

Example 2

As shown in fig. 5 and 6, the present embodiment is different from embodiment 1 in that a fan 6 is also provided in the upper space of the housing 1, and a fan power supply and failure detection interface 3-12 is provided on the first PCB substrate 3-1. The fan 6 is used for promoting the strong flow of the upper air in the case 1, and avoids the problem that the temperature of the upper air rapidly rises in a high-temperature and sultry environment to influence the normal work of electronic devices and bring potential safety hazards to the whole device. In the embodiment, 5 fan power supply and fault detection interfaces 3-12 are arranged on the first PCB substrate 3-1, and the fan power supply and fault detection interfaces 3-12 are used for supplying power to the fans 6 on the lower layer and the upper layer in the chassis 1. The fan power supply and fault detection interfaces 3-12 can supply power and detect fan faults, can give an alarm immediately when the fan is in fault, and can prompt a user through the intelligent display modules 3-14 and the remote background (when the device is connected with the remote background), so that the device can be protected in time, faults can be found and the device can be informed and processed in time, the device is ensured to be on line for a long time, and the function of the device can be fully exerted.

According to the utility model, the partition plate 2 is arranged in the case 1, so that the installation space in the case 1 is divided into an upper layer and a lower layer, an electronic device with a service life sensitive to temperature is arranged in the upper layer, a heat radiator, a fan and other heat dissipation devices and an electronic device with a service life insensitive to temperature are arranged in the lower layer, an independent passage is provided for the flow of hot air, and a good air duct is established for heat dissipation. The radiator in the lower layer space can perform thermal diffusion on the insulated gate bipolar transistor, and the fan can perform forced heat dissipation on the electronic devices on the inversion single board, so that a better heat dissipation effect is realized, and the devices are ensured to work below a rated temperature; and the electronic devices on the power single boards such as the capacitor, the driving board and the main control board, the service life of which is sensitive to the temperature, are arranged in the upper low-temperature space, and the heat generated after the radiator radiates the IGBT cannot pass through the electronic devices on the power single boards, so that the electronic devices which are not suitable for the high-temperature environment can be effectively protected, the service life of the devices can be prolonged, and the cost is reduced. In addition, the utility model integrates the fuses, the energy storage capacitor bank, the relays, the IGBT and other power unit devices on a single board, achieves the purposes of uniform distribution, reasonable heat dissipation, convenient installation and simple and convenient maintenance by reasonable layout, reduces the use and maintenance cost, and adopts a single board structure, compared with a plurality of sub-boards which are combined in a splicing way and the like, the utility model has better stability and firm installation, is also beneficial to prolonging the service life of electronic devices and reducing the use and maintenance cost.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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 invention 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 (10)

1. An electric energy conversion device comprises a case, a power single board, an inversion single board, a radiator and a fan, wherein the power single board, the inversion single board, the radiator and the fan are arranged in the case; the method is characterized in that:

a partition board which divides the internal space of the case into an upper layer and a lower layer is arranged in the case, the power single board is arranged in the upper layer space above the partition board, and the inversion single board, the radiator and the fan are arranged in the lower layer space below the partition board;

the power veneer comprises a first PCB substrate, wherein the first PCB substrate is provided with: the power supply comprises a first power unit, a second power unit, a third power unit, a main control board mounting position for mounting a main control board, an energy storage capacitor bank and a resonant capacitor.

2. The electrical energy conversion device of claim 1, wherein: the first power unit, the second power unit and the third power unit each include:

an insulated gate bipolar transistor;

the isolation driving board receives the modulation signal of the main control board and outputs the modulation signal to the insulated gate bipolar transistor;

a current detection element connected to the current path of the insulated gate bipolar transistor;

a relay for protecting the insulated gate bipolar transistor;

and the resonant capacitor is used for forming the LCL resonant circuit.

3. The electrical energy conversion device of claim 1, wherein: still be provided with on the first PCB base plate:

the incoming line terminal is connected with a power grid line and is connected with the first power unit, the second power unit and the third power unit through fuses;

the external current transformer converts the sensed external current signal into a voltage signal and outputs the voltage signal to the main control board.

4. The electrical energy conversion device of claim 2, wherein: the isolation driving board, the current detection element, the relay and the resonant capacitor are arranged on the first surface of the first PCB substrate, the insulated gate bipolar transistor is arranged on the second surface of the first PCB substrate, and the radiator is arranged on the second surface of the first PCB substrate and used for radiating the insulated gate bipolar transistor.

5. The electrical energy conversion device of claim 2, wherein: the fan is arranged in the lower layer space and the upper layer space of the case, and a fan power supply and fault detection interface is arranged on the first PCB substrate.

6. The electrical energy conversion device of claim 1, wherein: the energy storage capacitor bank is composed of a plurality of direct current capacitors.

7. The electrical energy conversion device of claim 1, wherein: and the first PCB substrate is also provided with an intelligent display module.

8. The electrical energy conversion device of claim 7, wherein: the intelligent display module is a touch display module with a wireless communication function.

9. The electrical energy conversion device of claim 1, wherein: the first power unit, the second power unit and the third power unit further comprise absorption capacitors arranged on the first PCB substrate.

10. The electrical energy conversion device of claim 1, wherein: the inverter single board comprises a second PCB substrate and an inductor arranged on the second PCB substrate, and the inductor and the resonant capacitor form an LCL resonant circuit.

Images