CN217159557U

CN217159557U - Rectifying and filtering circuit suitable for three-phase power supply system

Info

Publication number: CN217159557U
Application number: CN202123373914.7U
Authority: CN
Inventors: 王赔赔; 郑金陵
Original assignee: Suzhou Qineng Electronic Technology Co ltd
Current assignee: Suzhou Qineng Electronic Technology Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-08-09
Anticipated expiration: 2031-12-29

Abstract

The utility model relates to a rectification filter circuit suitable for three-phase power supply system, including the three-phase input power, the output of three-phase input power links to each other in bridge rectifier module's input, bridge rectifier module's output links to each other with switch module's input, switch module's output links to each other with filter module's input, filter module's output links to each other with the load. The utility model discloses can improve power factor.

Description

Rectifying and filtering circuit suitable for three-phase power supply system

Technical Field

The utility model relates to a rectification filter circuit suitable for three-phase power supply system.

Background

In the modern society, with the development and progress of science and technology, frequency converters have penetrated into various industries as driving parts of motors. From a fan, a water pump and a speed reducer, the soft start and speed regulation industries all need a frequency converter to realize.

The frequency converter is used as an energy supply unit driven by a motor, and the driving efficiency and the power factor of the frequency converter directly determine the consumption of electric energy and the influence on a power grid.

Most of the power factors of the current 3-phase 380V power supply frequency converter are 65% -75%, and the loss of reactive power is extremely high. This is particularly heavy in load and reactive energy consumption of the grid.

One of the traditional methods for improving the power factor is passive power factor correction, in which a bus reactance is connected in series in the front stage of a rectifier bridge and a bus capacitor, as shown in fig. 1, inductance values of the bus reactance L1 and L1 are added, and the inductance values are adjusted according to the size of the bus capacitor and the power, but as shown in fig. 2, the current waveform distortion is serious, the harmonic content is extremely high, and the scheme can improve the power factor by 10%, and the power factor is about 75% -85%, and is still not high. And the volume of the low-frequency reactance is large, and the cost is high. In the case of a 2.2KW frequency converter, a 10mH reactance is used, so that the hardware cost increases.

Another conventional approach, as shown in fig. 3, employs active power factor correction. The active power factor circuit with 380V three-phase input is complex and expensive, and is not suitable for a low-cost frequency converter.

In view of the above-mentioned drawbacks, the present designer is actively making research and innovation to create a new type of rectifying and filtering circuit suitable for three-phase power supply system, so that the rectifying and filtering circuit has more industrial utility value.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the present invention provides a rectifying and filtering circuit for a three-phase power supply system.

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

the utility model provides a rectification filter circuit suitable for three-phase power supply system, includes three-phase input power, three-phase input power's output links to each other in bridge rectifier module's input, bridge rectifier module's output links to each other with switch module's input, switch module's output links to each other with filter module's input, filter module's output links to each other with the load.

Preferably, the rectifying and filtering circuit is suitable for a three-phase power supply system, and the filtering module is a thin film capacitor.

Borrow by above-mentioned scheme, the utility model discloses at least, have following advantage:

the circuit of the utility model adopts the film capacitor, the voltage of the capacitor is high, voltage-sharing resistors (R1, R2) in the traditional circuit are not needed, and the loss is reduced; the capacitor has lower internal resistance and small heat emission; the capacitor has higher Dv/Dt, can bear higher impact and is more stable, and after the scheme is adopted, under the rated power, the power factor is 92 percent, and compared with the traditional frequency converter, the power factor is improved by about 25 percent, and the reactive loss is obviously weakened.

The above description is only an outline of the technical solution of the present invention, and in order to make the technical means of the present invention more clearly understood and to be implemented in accordance with the content of the specification, the following detailed description will be given of preferred embodiments of the present invention in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a conventional three-phase circuit diagram of the present invention;

fig. 2 is a waveform diagram of fig. 1 of the present invention;

fig. 3 is another conventional three-phase circuit diagram of the present invention;

fig. 4 is a circuit diagram of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "vertical", "horizontal", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and for simplification of description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or vertical, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Examples

As shown in fig. 4, a rectification filter circuit suitable for a three-phase power supply system includes a three-phase input power supply 1, an output end of the three-phase input power supply 1 is connected to an input of a bridge rectifier module 2, an output end of the bridge rectifier module 2 is connected to an input end of a switch module 3, an output end of the switch module 3 is connected to an input end of a filter module 4, and an output end of the filter module 4 is connected to a load.

The utility model discloses in filtering module 4 is film capacitor.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a rectification filter circuit suitable for three-phase power supply system which characterized in that: including three-phase input power supply (1), the output of three-phase input power supply (1) links to each other in the input of bridge rectifier module (2), the output of bridge rectifier module (2) links to each other with the input of switch module (3), the output of switch module (3) links to each other with the input of filter module (4), the output of filter module (4) links to each other with the load.

2. A rectifying and filtering circuit suitable for a three-phase power supply system according to claim 1, characterized in that: the filtering module (4) is a film capacitor.