CN202872654U - High-power explosion-proof frequency converter - Google Patents
High-power explosion-proof frequency converter Download PDFInfo
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- CN202872654U CN202872654U CN 201220569570 CN201220569570U CN202872654U CN 202872654 U CN202872654 U CN 202872654U CN 201220569570 CN201220569570 CN 201220569570 CN 201220569570 U CN201220569570 U CN 201220569570U CN 202872654 U CN202872654 U CN 202872654U
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Abstract
The utility model provides a high-power explosion-proof frequency converter. The high-power explosion-proof frequency converter comprises a filter unit which is used for filtering input alternating current, and at least two power units which are used for converting the input alternating current into preset frequencies and voltages, wherein the at least two power units are connected in parallel, and input ends of the at least two power units are respectively connected to output ends of the filter unit. The high-power explosion-proof frequency converter realizes high power output by connecting the power units in parallel, and prevents large loss during heavy current.
Description
Technical field
The utility model relates to the explosion-proof frequency converter field, more particularly, relates to a kind of high-power explosion-proof frequency converter.
Background technology
Along with the progress of science and technology, the motor frequency conversion control technology has been widely used in the fields such as machinery, metallurgy, light textile and household electrical appliance.In the inflammable and explosive environment such as mine, petrochemical industry, be widely used high-power high-tension large-size machine, the relatively common frequency converter of frequency converter that these occasions are used is harsher.
Traditional explosion-proof frequency converter is because being subjected to the restriction of power device, and complete machine power is difficult to do greatly, for example, during existing explosion-proof frequency converter output 1140V, needs to use the high voltage power device of 3300V.
Continuous progress along with semiconductor technology, although some high power devices occurred, but in application, the high-voltage great-current converter often is accompanied by such as higher switching loss, larger voltage change ratio (dv/dt) and comparatively complicated humorous wave interference (EMI) problem, destroys easily electrical machine insulation and motor damage.Therefore, above-mentioned high-voltage great-current converter need to install output filter additional in most of occasions, thereby causes the whole system volume larger, and cost is higher.
The utility model content
The technical problems to be solved in the utility model is that the problem for above-mentioned explosion-proof frequency converter complete machine power is not easy to do greatly, cost is higher provides a kind of high-power explosion-proof frequency converter.
The technical scheme that the utility model solves the problems of the technologies described above is, a kind of high-power explosion-proof frequency converter is provided, comprise for the alternating current to input carry out the filter unit of filtering and at least two be used for will input alternating current be converted to the power cells of predeterminated frequency and voltage, wherein: described at least two power cells are connected in parallel and the input of these at least two power cells is connected respectively to the output of filter unit.
In high-power explosion-proof frequency converter described in the utility model, described frequency converter comprises that also the output of described at least two power cells is connected respectively to the input of described output current-sharing unit for the output current-sharing unit that the output of power cell is carried out sharing control.
In high-power explosion-proof frequency converter described in the utility model, each described power cell comprises rectification unit, DC filtering unit and inversion unit, and the rectification unit of all power cells, DC filtering unit and inversion unit are connected on the same group of dc bus.
In high-power explosion-proof frequency converter described in the utility model, described filter unit connects three-phase alternating-current supply and described three-phase alternating-current supply is carried out filtering, and the rectification unit of described power cell and inversion unit adopt respectively three level structures.
In high-power explosion-proof frequency converter described in the utility model, described rectification unit and inversion unit are made of high power switch element and clamping diode respectively.
In high-power explosion-proof frequency converter described in the utility model, described DC filtering unit comprises high voltage thin film electric capacity and grading resistor.
In high-power explosion-proof frequency converter described in the utility model, described frequency converter also comprises the open water-cooling radiating structure that is used to described power cell heat radiation.
High-power explosion-proof frequency converter of the present utility model has following beneficial effect: realized high-power output by the power cell parallel connection, the lossy when having avoided large electric current.And the utility model output voltage rate of change is less, and humorous wave interference is little, therefore need not to install additional output filter, can effectively reduce cost.In addition, the utility model has solved the heat dissipation problem of big-power transducer by open current radiator, can reduce equipment volume, improves power density.
Description of drawings
Fig. 1 is the schematic diagram of the utility model high-power explosion-proof frequency converter embodiment.
Fig. 2 is the schematic diagram of power cell among Fig. 2.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
As shown in Figure 1, be the schematic diagram of the utility model high-power explosion-proof frequency converter embodiment.High-power explosion-proof frequency converter in the utility model comprises filter unit 21 and two power cells 22.The input of above-mentioned filter unit 21 connects AC network 10, and the alternating current of input is carried out the filtering processing, is input to power cell 22 behind the harmonic wave with filtering net side.Two power cells 22 adopt the identical module of structure, and are connected in parallel.The input of these two power cells 22 is connected respectively to the output of filter unit 21.Above-mentioned power cell 22 is respectively applied to the alternating current of input is converted to the frequency conversion voltage of predeterminated frequency and voltage, with 30 operations of control load motor.
Balanced in order to guarantee above-mentioned two power cell 22 output currents, above-mentioned frequency converter also can comprise be used to the output current-sharing unit 23 that carries out sharing control.The output of two power cells 22 is connected respectively to the input of output current-sharing unit 23, and output current-sharing unit 23 detects in real time the output current of two power cells 22 and compares.When the output current of power cell 22 exceeded setting range, output current-sharing unit 23 automatically performed corresponding sharing control, guaranteed that two power cell 22 output currents are balanced.
In actual applications, the quantity of power cell 22 can be adjusted as required, to satisfy different application scenarios.The electric current of required conversion is larger, and the quantity of the power cell 22 of use is more.
As shown in Figure 2, each power cell 22 can comprise rectification unit 221, DC filtering unit 222 and inversion unit 223.The rectification unit 221 of all power cells 22, DC filtering unit 222 and inversion unit 223 are connected to same group of dc bus, thereby realize being connected in parallel of power cell 22.
Can be consisted of by high power switch element 225 and clamping diode 226 respectively in above-mentioned rectification unit 221 and the inversion unit 223.DC filtering unit 222 then comprises high voltage thin film electric capacity and grading resistor.Certainly, when specific implementation, above-mentioned rectification unit 221, DC filtering unit 222 and inversion unit 223 also can be replaced by the element that can realize identical function.
When energy by AC network 10 flow direction motors 30 time, motor 30 is operated in motoring condition.Rectification unit 221 is rectified into DC power supply with three-phase alternating current, after 222 filtering of DC filtering unit, DC power supply is transformed into the AC power of voltage and changeable frequency with the operation of control motor 30 through inversion unit 223 again.
When motor 30 brakings or counter-rotating, motor 30 works in generating state.At this moment, inversion unit 223 is rectified into direct current with the electric energy of motor 30, and after 222 filtering of DC filtering unit, is reverse into the alternating current identical with AC network 10 current potentials by rectification unit 221 and is fed back to AC network 10.
High-power explosion-proof frequency converter of the present utility model can be applicable to three level occasions, be that filter unit 21 connects three-phase alternating-current supply and three-phase alternating-current supply is carried out the filtering processing, the rectification unit 221 of each power cell 22 and inversion unit 223 adopt respectively three level structures.
The radiator portion of above-mentioned high-power explosion-proof frequency converter can adopt open water-cooling radiating structure, can adapt to different water sources and endless form, such as interior water circulation or outer water circulation, and applicable various water quality, such as pure water or light water.By water-cooling radiating structure, can make the volume of frequency converter less, power density is higher.
The above; it only is the better embodiment of the utility model; but protection range of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claim.
Claims (7)
1. high-power explosion-proof frequency converter, it is characterized in that: comprise for the alternating current to input carry out the filter unit of filtering and at least two be used for will input alternating current be converted to the power cells of predeterminated frequency and voltage, wherein: described at least two power cells are connected in parallel and the input of these at least two power cells is connected respectively to the output of filter unit.
2. high-power explosion-proof frequency converter according to claim 1, it is characterized in that: described frequency converter comprises that also the output of described at least two power cells is connected respectively to the input of described output current-sharing unit for the output current-sharing unit that the output of power cell is carried out sharing control.
3. high-power explosion-proof frequency converter according to claim 1 and 2, it is characterized in that: each described power cell comprises rectification unit, DC filtering unit and inversion unit, and the rectification unit of all power cells, DC filtering unit and inversion unit are connected on the same group of dc bus.
4. high-power explosion-proof frequency converter according to claim 3 is characterized in that: described filter unit connects three-phase alternating-current supply and described three-phase alternating-current supply is carried out filtering, and the rectification unit of described power cell and inversion unit adopt respectively three level structures.
5. high-power explosion-proof frequency converter according to claim 3, it is characterized in that: described rectification unit and inversion unit are made of high power switch element and clamping diode respectively.
6. high-power explosion-proof frequency converter according to claim 3, it is characterized in that: described DC filtering unit comprises high voltage thin film electric capacity and grading resistor.
7. high-power explosion-proof frequency converter according to claim 3 is characterized in that: described frequency converter also comprises the open water-cooling radiating structure that is used to described power cell heat radiation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220569570 CN202872654U (en) | 2012-10-31 | 2012-10-31 | High-power explosion-proof frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220569570 CN202872654U (en) | 2012-10-31 | 2012-10-31 | High-power explosion-proof frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202872654U true CN202872654U (en) | 2013-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220569570 Expired - Fee Related CN202872654U (en) | 2012-10-31 | 2012-10-31 | High-power explosion-proof frequency converter |
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| Country | Link |
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| CN (1) | CN202872654U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113192A (en) * | 2014-06-24 | 2014-10-22 | 许继电气股份有限公司 | IGBT three-level power module |
-
2012
- 2012-10-31 CN CN 201220569570 patent/CN202872654U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113192A (en) * | 2014-06-24 | 2014-10-22 | 许继电气股份有限公司 | IGBT three-level power module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160302 Address after: Wuzhong District Wuzhong Economic Development Zone, Suzhou City, Jiangsu province 215000 Wang Xiang Shan Industrial Park Road on the north side of friends Patentee after: Suzhou Huichuan Technology Co.,Ltd. Patentee after: Shenzhen Inovance Technology Co., Ltd. Address before: Wuzhong District Wuzhong Economic Development Zone, Suzhou City, Jiangsu province 215000 Wang Xiang Shan Industrial Park Road on the north side of friends Patentee before: Suzhou Huichuan Technology Co.,Ltd. Patentee before: Suzhou Monarch Control Technology Co., Ltd. Patentee before: Shenzhen Inovance Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20191031 |