CN202135065U

CN202135065U - Frequency conversion apparatus

Info

Publication number: CN202135065U
Application number: CN201120194297U
Authority: CN
Inventors: 张磊
Original assignee: BEIJING CONTROL TECHNOLOGY Co Ltd
Current assignee: BEIJING CONTROL TECHNOLOGY Co Ltd
Priority date: 2011-06-10
Filing date: 2011-06-10
Publication date: 2012-02-01
Anticipated expiration: 2021-06-10

Abstract

The utility model discloses a frequency conversion apparatus, belonging to the measurement and control field. The frequency conversion apparatus comprises a control part composed of an inversion CPU control module, a power supply module, a detection module, a switching interface rear-guard module and an inversion interface rear-guard module; and a major loop part composed of an inversion IGBT power module, a switching IGBT module, a rectification module and a capacitor. The capacitor is used for storing direct current rectified by the rectification module; and three-phase AC close to a sine wave switched by the inversion IGBT power module is output. The inversion CPU control module of the control part sends a control signal to the inversion interface rear-guard module and the switching interface rear-guard module, so that switching and turn-off of the inversion IGBT power module and the switching IGBT module are controlled; and too high voltage generated by the capacitor is consumed by the switching IGBT module. According to the utility model, the advantages are that: operation is simple; function is simple; volume is small; work time of total load is long; and 1140 V voltage can be directly accessed without a transformer.

Description

A kind of converter plant

Technical field

The utility model belongs to measurement and control area, specifically, is a kind of converter plant that does not need can directly insert with transformer 1140V voltage.

Background technology

The know-why of frequency converter is to utilize the on-off action of power semiconductor device power frequency supply to be transformed to the electric energy control device of another frequency.The frequency converter that we use now mainly adopts a friendship friendship mode (VVVF frequency conversion or Vector Control Frequency Conversion) always; Earlier convert power frequency AC to DC power supply through rectifier, and then convert DC power supply to frequency, voltage all controllable AC power to supply with motor.

The motor that frequency control can be applied in the overwhelming majority drags occasion, because it can provide accurate speed control, therefore can control mechanically operated rising, decline and variable-speed operation easily.The high efficiency (speed change does not rely on mechanical part) that can improve technology is widely used in frequency conversion, simultaneously can be more energy-conservation than original constant speed operation motor.

Use the double advantage that variable-frequency control technique has economize on electricity and improves the technology controlling and process level; Both can alleviate energy shortage, reduce greenhouse gas emission; Meet the fundamental state policy that China builds a conservation-minded society, also help to improve the quality of products, promote the industrial technology progress.Frequency converter more helps to improve the competitiveness of enterprise product up to the power savings of 20%-60%.Be widely used in fields such as printing, lathe, plastics, pharmacy, papermaking, weaving, printing and dyeing, food, rubber, oil field, mine, metallurgy, iron and steel, chemical industry, water treatment, blower fan water pump.

Advocate under the excellent situation of building a conservation-minded society in country, the paces that colliery industry frequency converter is transformed will be more and more faster.Frequency converter will be carried out in the application of coal mine belt conveyor, mine winder, emulsion power pack, main fan, fully-mechanized mining equipment, central gas suction pump comprehensively; What but the colliery electrical network of China adopted is the 1140V power supply; The down-hole special converter that does not also have this 1140V power supply at present both at home and abroad; All formed by the 380V of company electric pressure universal frequency converter transformations such as ABB, Mitsubishis, promptly common way is additional transformer, uses after 1140V voltage is reduced to 380V.Owing to receive condition restriction such as technology barriers, redevelopment ability; Though these reputable brand frequency converters of domestic transformation have good characteristics; But these universal frequency converters problems such as life-span weak point, failure rate height all occur in when design and reckon without the characteristics of down-hole when reality is used after all.Additional simultaneously transformer has also strengthened the size of coal-winning machine, has taken the precious tunnel space in down-hole, has increased the tunnel piercing cost.

Summary of the invention

The utility model proposes a kind of adaptation coal mine operation for solving the problems of the technologies described above, and satisfies the 1140V converter plant to the requirement of dwindling the coal-winning machine size.

A kind of converter plant; Comprise the control section that driving module and inversion interface rear-guard module are formed behind inversion CPU control module, power module, detection module, the switching interface, and the major loop part of forming by inversion IGBT power model, switching IGBT module, rectification module and capacitor.

Wherein, the rectification module industrial frequency AC electric rectification that is used for that external electrical network is provided is a direct current.Capacitor is used for direct current after storage and the level and smooth rectification module rectification.Inversion IGBT power model is used for direct current with capacitor stores and is transformed near sinusoidal wave three-phase alternating current and exports.Switching IGBT module is used for the voltage of capacitor is consumed via brake resistance.Power module is used to driving module and inversion interface rear-guard module for power supply behind inversion CPU control module, power module, detection module, the switching interface.Said power module is exported No. 8 DC power supplys, and wherein No. 6 DC power supplys are used for supplying with inversion CPU control module, driving module behind driving module and the switching interface behind 1 road direct-current power supply inversion interface, and No. 1 DC power supply is used for supplying with detection module.Inversion CPU control module is used for that driving module transmits control signal behind driving module behind the inversion interface and switching interface.Driving module is used for to be triggering signal, to trigger inversion IGBT power model and open and turn-off the three level pulse widths modulation signal transitions that receive behind the inversion interface.Driving module is used to control the open and close of switching IGBT module behind the switching interface.Detection module is used for the three-phase alternating current of exporting in the voltage at major loop part capacitor two ends and the inversion IGBT power model is detected in real time, and detected voltage signal and current signal are sent to inversion CPU control module.

The advantage of the utility model is:

1, the utility model need not use transformer can directly insert 1140V voltage;

2, the utility model is simple to operate, function is simple, volume is little, and the full load operating time is long;

3, the utility model is safer at work, stable, reliable.

Description of drawings

Fig. 1 is the utility model structured flowchart;

Fig. 2 is the utility model integral installation structured flowchart.

Among the figure:

Driving module behind the 1-inversion CPU control 2-power module 3-detection module 4-switching interface

Module

5-inversion interface rear-guard 6-inversion IGBT merit 7-switching IGBT module 8-rectification module

Module rate module

The 9-capacitor 10-cooled plate 11-first supporting plate 12-second supporting plate

13-the 3rd supporting plate 14-support column 15-stack bus bar

Embodiment

To combine accompanying drawing that the utility model is done further to specify below.

A kind of frequency converter of the utility model; Comprise the control section of forming by driving module 5 behind driving module behind inversion CPU control module 1, power module 2, detection module 3, the switching interface 4 and the inversion interface; And the major loop part of forming by inversion IGBT power model 6, switching IGBT module 7, rectification module 8 and capacitor 9, as shown in Figure 1.

In the major loop part, rectification module 8 is the uncontrollable rectifier of three-phase bridge, and the industrial-frequency alternating current that is used for that external electrical network is provided carries out rectification and obtains direct current, stores and smoothly through the direct current of capacitor 9 after with rectification module 8 rectifications.

Inversion IGBT power model 6 is used for the direct current of capacitor 9 storages is transformed near sinusoidal wave three-phase alternating current output.

When capacitor 9 voltages are increased to dangerous values, consume via brake resistance through the voltage of switching IGBT module 7 capacitor 9, reduce the too high voltage of capacitor 9, each module is not by over-voltage breakdown in the protection major loop part.

In the control module; Control power supply 2 is used for for control section the alternating current 220V input being provided; Exportable No. 8 DC power supplys; Wherein there are No. 6 DC power supplys to be used for supplying with inversion CPU control module 1, No. 1 DC power supply and are used for supplying with behind the inversion interface that driving module 4, No. 1 DC power supply is used for supplying with detection module 3 behind the driving module 5 and switching interface;

Inversion CPU control module 1 is a central controller; Being used for behind the inversion interface driving module 5 sends three-level pwm (pulse width modulation) signals; Driving module 5 will receive the triggering signal of three-level pwm (pulse width modulation) signal transition for can drive inverse IGBT power model 6 opening and turn-off behind the inversion interface, thereby realize the output control of inversion IGBT power model 6.Inversion CPU control module 1 also behind the switching interface driving module 4 transmit control signal, through the open and close of driving module behind the switching interface 4 control switching IGBT modules 7.

The three-phase alternating current of exporting in the voltage at capacitor 9 two ends and the inversion IGBT power model 6 in 3 pairs of major loop parts of detection module detects in real time; And detected voltage signal and current signal sent to inversion CPU control module 1, inversion CPU control module 1 judges according to the voltage signal and the current signal that receive whether capacitor 9 two ends and inversion IGBT power model 6 exist short circuit, overvoltage or under-voltage situation.If detect short circuit, overvoltage or under-voltage situation, then control the inversion interface immediately after driving module 5 turn-off the output of inversion IGBT power models 6, thereby realize protection to the major loop part.

Driving module 5 is when triggering inversion IGBT power model 6 is opened and turn-offed behind the said inversion interface; Also inversion IGBT power model 6 is detected; Short circuit, overvoltage or under-voltage situation appear if detect inversion IGBT power model 6; Then turn-off the output of inversion IGBT power model 6 immediately, and send alarm signal to inversion CPU control module 1.Realize protection thus to inversion IGBT power model 6.Realized duplicate protection through driving module 5 behind detection module 3 and the inversion interface, made frequency converter safer at work, stable, reliable frequency converter.

Through the utility model converter plant, realize not needing directly to insert 1140V voltage with transformer.

Above-mentioned inversion IGBT power model 6 is three bridge-type inverters, the minimum BSM75GB170DN2 of volume in the inverter of employing ad eundem, the overall volume of the frequency converter that reduces thus.

Because the galvanic storage of a plurality of connection in series-parallel ability of the relation of electrochemical capacitor appearance value and voltage, electrochemical capacitor needs under Da Rong value and voltage, and the consistency of each electric capacity need be guaranteed, and this has increased difficulty to screening; In order to overcome the problems referred to above, capacitor 9 adopts thin-film capacitors in the utility model thus, and the thin-film capacitor volume can adjust as required, has reduced the overall volume of converter plant thus greatly.

In order further to reduce the overall volume of the utility model converter plant; Therefore adopt range upon range of installation between major loop part and control section, as shown in Figure 2, wherein major loop partly is installed on the cooled plate 10; Above the major loop part, be provided with first supporting plate 11; First supporting plate 11 is connected through support column 14 and cooled plate 10, is equipped with on first supporting plate 11 behind the switching interface that driving module 5, the first supporting plates 11 tops are provided with second supporting plate 12 behind the driving module 4 and inversion interface; Second supporting plate 12 is connected through the iron prop 14 and first supporting plate 11, on second supporting plate 12 power module 2 is installed.Second supporting plate, 11 tops are provided with the 3rd supporting plate 13; The 3rd supporting plate 11 is connected through the support column 14 and second supporting plate 12; Inversion CPU control module 1, detection module 3 are installed on the 3rd supporting plate 13; Between first supporting plate 11 and major loop part, stack bus bar 15 is installed also, realizes being connected of 5 of driving modules behind driving module 4 behind major loops part and the switching interface, the inversion interface through stack bus bar 15.Close installation between stack bus bar 15 and major loop reduces the interference of major loop part self.Be installed on the cooled plate 10 through support column 14, the heat absorption of sending when can major loop partly working through cooled plate 10 guarantees major loop part operate as normal, and each supporting plate is played a supporting role.Support column is selected iron prop for use in the utility model.

Said stack bus bar 15 is connected to form an integral body for a plurality of water conservancy diversion copper bars are range upon range of, adopt three range upon range of stack bus bars 15 that are connected to form of water conservancy diversion copper bar in the present embodiment, can increase the shock resistance of converter plant and the convenience of installation through stack bus bar 15.

Claims

1. a converter plant is characterized in that: comprise

The industrial frequency AC electric rectification that is used for that external electrical network is provided is galvanic rectification module;

Be used for galvanic capacitor after storage and the level and smooth rectification module rectification;

Be used for the direct current of capacitor stores is transformed into the inversion IGBT power model of exporting near sinusoidal wave three-phase alternating current;

Be used for voltage with capacitor via the used up switching IGBT of brake resistance module;

Be used to the power module of driving module and inversion interface rear-guard module for power supply behind inversion CPU control module, detection module, the switching interface;

Be used for the inversion CPU control module that driving module transmits control signal behind driving module behind the inversion interface and switching interface;

The three level pulse widths modulation signal transitions that are used for receiving are triggering signal, driving module behind the inversion interface that triggering inversion IGBT power model is opened and turn-offed;

Be used to control driving module behind the switching interface of open and close of switching IGBT module;

Be used for detection module that the three-phase alternating current of exporting in the voltage at major loop part capacitor two ends and the inversion IGBT power model is detected in real time, detected voltage signal and current signal send to inversion CPU control module.

2. a kind of according to claim 1 converter plant; It is characterized in that: driving module detects inversion IGBT power model behind the said inversion interface; Short circuit, overvoltage or under-voltage situation appear if detect inversion IGBT power model; Then turn-off inversion IGBT power model, and send alarm signal to inversion CPU control module.

3. a kind of according to claim 1 converter plant; It is characterized in that: said power module is exported No. 8 DC power supplys; Wherein No. 6 DC power supplys are used for supplying with inversion CPU control module; Driving module behind driving module and the switching interface behind 1 road direct-current power supply inversion interface, No. 1 DC power supply is used for supplying with detection module.

4. a kind of according to claim 1 converter plant is characterized in that: said inversion CPU control module driving module behind the inversion interface sends three level pulse widths modulation signals.