CN201608627U - A general frequency converter - Google Patents

Abstract

The utility model discloses a general-purpose frequency converter, which comprises a casing, the casing is provided with a radiator, a drive board and a control board, and a cooling hole and a wiring hole are opened on the casing, and the characteristic lies in that the drive board is The split structure is composed of upper and lower sub-drive boards stacked, and a plurality of terminals are arranged between the upper sub-drive board and the lower sub-drive board, and the terminals are conductive copper posts. The utility model constitutes the driving board by laminating the upper and lower sub-driving boards, and the composed circuit is placed on the two sub-driving boards, and connected by the connecting post between the two, so as to disperse the distribution of the circuit, reduce the concentration of heat, and effectively improve the frequency conversion. The heat dissipation capacity of the controller is improved to prolong the service life, and at the same time, a modular interface is formed on each sub-drive board to facilitate the assembly and disassembly of the power cord.

Description

A general frequency converter

technical field

The utility model relates to an electronic device, in particular to a general-purpose frequency converter, which is mainly used for speed regulation of an AC asynchronous motor.

Background technique

Inverter is a device that converts power frequency power (50Hz or 60Hz) into AC power of various frequencies to realize variable speed operation of the motor. The control circuit completes the control of the main circuit, and the rectifier circuit converts AC into DC. The circuit smoothes and filters the output of the rectifier circuit, and the inverter circuit inverts the direct current into alternating current. For inverters that require a lot of calculations, such as vector control inverters, sometimes a CPU for torque calculation and some corresponding circuits are needed. The frequency converter is an AC power supply that can be used for frequency modulation and voltage regulation. One frequency converter can drive multiple motors at the same time, thereby saving equipment investment. The power factor of the power supply of the motor is high, and it is not affected by the power factor of the motor. According to the classification of usage, frequency converters can be divided into general-purpose frequency converters, high-performance special-purpose frequency converters, high-frequency frequency converters, single-phase frequency converters, and three-phase frequency converters.

At present, the general-purpose inverter is mainly composed of a housing, a radiator installed in the housing, a drive board, and a control board. There is a wiring hole. When in use, the power supply is connected to the power supply terminal in the frequency converter through the wiring hole. However, since each electronic component is concentrated on one drive board, especially since there are many DC bus filter capacitors with large heat generation distributed on the board, the components are relatively concentrated, resulting in poor heat dissipation effect, which directly affects the performance and performance of the inverter. The service life of components and parts; In addition, the power terminals are all encapsulated inside the shell, and the integrated shell must be removed to complete the connection of the power line when in use, which brings inconvenience to the operation.

Contents of the invention

The purpose of the utility model is to provide a general-purpose frequency converter, which can effectively improve the overall heat dissipation performance and prolong the service life of components through the improvement of the structure.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a general-purpose frequency converter, including a housing, a radiator, a drive board and a control board are arranged in the housing, and a cooling hole and a wiring hole are opened on the housing. The drive board is a split structure, consisting of an upper sub-drive board and a lower sub-drive board stacked. A plurality of terminals are arranged between the upper sub-drive board and the lower sub-drive board, and the terminals are conductive copper posts.

In the above technical solution, the upper and lower drive boards are respectively provided with a wiring socket interface corresponding to the wiring holes, and extend to the outside of the housing, and the upper sub-drive board is distributed with DC bus filter capacitors and absorption circuits part, corresponding to the wiring strip interface on the upper sub-drive board is a three-phase input interface module, and the corresponding wiring strip interface on the lower sub-drive board is a three-phase output interface module.

In the above, the inverter usually includes a control board and a drive board. The control board is mainly equipped with control circuits such as digital signal processors and display input panel circuits, which are weak current components, and the drive board is equipped with rectification circuits, filter circuits, and inverters. Circuit, power supply output, switching power supply circuit and current sensor, etc., in the above technical solution, the drive board is composed of two circuit boards, the upper and lower drive boards, and the strong electric part with large heat generation is divided into two parts, which are respectively arranged in The upper and lower boards are used to reduce the concentration of the circuit and facilitate the dissipation of heat. The two are electrically connected through a terminal. In particular, the DC bus filter capacitor and absorbing circuit part (filter circuit part) can be arranged on the upper sub-drive board, and other parts can be arranged on the lower sub-drive board, and the DC bus filter capacitor and the absorbing circuit part can be arranged separately from other circuits. Because the wiring of this part of the circuit is relatively simple, it can ensure that the DC bus capacitors that generate a lot of heat are fully dissipated. At the same time, there is a gap between the two sub-drive boards, which can provide heat dissipation space for the sub-drive board and solve the problem of difficult heat dissipation of the inverter. Effectively extend the service life. In addition, since the drive board is divided into two parts, the upper and lower sub-drive boards, the corresponding boards are provided with input and output wiring socket interfaces to connect with external devices in the form of module interfaces, and extend the wiring sockets to the wiring holes of the housing The outer side can greatly facilitate the assembly and disassembly of the external and power cords.

Due to the use of the above technical solutions, the utility model has the following advantages compared with the prior art:

1. Since the driver board of the present invention is composed of two layers of upper and lower sub-drive boards, the two layers are electrically connected by connecting posts, and the support between the two layers is realized, and the circuit set on the original driver board is divided into two parts , respectively arranged on the upper and lower sub-drive boards to disperse the density of the circuit distribution, reduce the concentration of heat sources, and use the space between the two layers for heat dissipation, solve the problem of inverter heat dissipation, and prolong the service life of components;

2. Arrange the DC bus filter capacitor and absorbing circuit with large heat generation and simple wiring on the upper sub-drive board, and distribute other circuits on the lower sub-drive board to ensure good heat dissipation of the DC bus capacitor;

3. The upper sub-drive board is provided with a three-wire power supply input wiring socket interface, and the lower sub-drive board is provided with a three-phase output wiring socket interface, which is connected to an external device with a modular interface, and the interface is extended to the outside of the wiring hole of the shell, no need Open the one-piece shell, which is convenient for the operator to assemble and disassemble the connection between the equipment, and the operation is simple.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment one;

Fig. 2 is a side view of Fig. 1;

Fig. 3 is a schematic partial cross-sectional view of Fig. 1 after removing the cover, housing and interface.

Among them: 1. Shell; 2. Wiring hole; 3. Wiring socket interface; 4. Cooling hole; 5. Radiator; 6. Lower sub-drive board; 7. Upper sub-drive board; 8. Terminal post; 9. Control plate.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Embodiment 1: Referring to Figures 1 to 3, a general-purpose frequency converter includes a housing 1, and the housing 1 is provided with a radiator 5, a drive board and a control board 9, and the front and rear sides of the housing 1 are A cooling hole 4 is provided, and a wiring hole 2 is provided on the bottom side. The drive board is a split structure, consisting of upper and lower sub-drive boards stacked, and an upper sub-drive board 7 and a lower sub-drive board 6 are provided. 6 terminals 8, the terminals 8 are conductive copper columns.

As shown in Figures 2 and 3, the upper and lower drive boards correspond to the wiring holes 2 on the left side housing 1 and are respectively provided with a wiring socket 3, and extend to the outside of the housing 1, the upper sub-drive board 7 The upper part is distributed with DC bus filter capacitors and absorbing circuit parts, corresponding to the wiring strip interface 3 on the upper sub-drive board 7 is a three-phase input interface module, and the lower sub-drive board 6 is distributed with DC bus filter capacitors and absorbing circuits. Circuits other than some, such as inverter circuits, power output circuits, etc., correspond to the wiring socket interface 3 on the lower sub-drive board 6 as a three-phase output interface module.

The sub-driver boards are stacked, and one of them is designed as a DC bus filter and absorption circuit part. This part of the capacitor occupies a larger area and the circuit wiring is relatively simple; the other parts are arranged on another sub-driver board. The two sub-driver boards They are connected and fixed through the DC busbar and the three-wire power input terminal. This ensures sufficient heat dissipation of the DC bus capacitor. In addition, the three-phase input of the power supply and the three-phase output of the frequency converter are made into the form of a module interface, which is convenient for assembly and disassembly. The one-piece housing 1 is disassembled, and the operation is simple.

Claims (2)

1. universal frequency converter, comprise housing, be provided with radiator, drive plate and control board in the described housing, offer louvre and wiring hole on the housing, it is characterized in that: described drive plate is for dividing body structure, be made of upper and lower two stacked placements of sub-drive plate, go up sub-drive plate and be provided with the complex root binding post between the sub-drive plate down, described binding post is a conduction copper column.

2. universal frequency converter according to claim 1, it is characterized in that: the corresponding described wiring hole of described upper and lower drive plate place is provided with a line bank interface respectively, and extend to the outside of housing, described going up is distributed as the dc bus filter capacitor and absorbs circuit part on the sub-drive plate, the corresponding described line bank interface of on the sub-drive plate is the three-phase input interface module, and corresponding described line bank interface is the three-phase output interface module on the following sub-drive plate.

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