CN103151908A - Filtering unit and frequency converter - Google Patents
Filtering unit and frequency converter Download PDFInfo
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- CN103151908A CN103151908A CN2013100058309A CN201310005830A CN103151908A CN 103151908 A CN103151908 A CN 103151908A CN 2013100058309 A CN2013100058309 A CN 2013100058309A CN 201310005830 A CN201310005830 A CN 201310005830A CN 103151908 A CN103151908 A CN 103151908A
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Abstract
The invention discloses a filtering unit and a frequency converter. The filtering unit is used for filtering a reification element and comprises three groups of capacitors and resistors which are connected in parallel, and three ways of phase lines at a line inlet side of the frequency converter are respectively in parallel connection with one group of the capacitor and the resistor which are connected in parallel, and are in series connection with one group of the capacitor and the resistor which are connected in parallel. The frequency converter utilizes the filtering unit. The filtering unit inhibits harmonic waves by simply connecting the capacitors and resistors which are connected in parallel, so that a complex structure and increase of the cost caused by the addition of a filter are avoided.
Description
Technical field
The present invention relates to a kind of filter unit and frequency converter.
Background technology
Along with developing rapidly of power electronic technology, computer technology, automatic control technology, AC Drive and control technology become one of technology at present with the fastest developing speed.Ac variable speed technology is current economize on electricity, improve technological process to improve the quality of products and to improve a kind of Main Means of environment, Promote Technology.Frequency converter is improving automation degree of equipment and labor productivity; Very large effect has all been brought into play in energy savings, the aspect such as reduce production costs.
Yet, can use simultaneously the rectifier cell such as thyristor etc. due to some application scenarios, can produce harmonic current, this harmonic current produces voltage drop in the impedance of electric power system, cause the voltage waveforms distortion.The voltage of this distortion forms for many electronic equipments and disturbs, in electronic equipment, voltage waveform surpasses the standard that the commercial Application requirement limits thereby make, as shown in Figure 1, although the limit in mean AV that this moment, actual test obtained surpasses the EMC(Electro Magnetic Compatibility) the limit in mean A_AV of testing standard EN55011A class standard; But peak limit QP can surpass the EMC(Electro Magnetic Compatibility in frequency range S) the peak limit A_QP of testing standard EN55011A class standard.Like this, can cause system to produce problems, for example, reduce electric power system stability and reliability, cause equipment to work, reduce product quality or affect communication apparatus normal operation etc.
Summary of the invention
The technical problem to be solved in the present invention is in order to overcome the harmonic wave defective that in prior art, rectifier cell causes, a kind of filter unit and frequency converter to be provided, suppressing harmonic wave by accessing simply electric capacity and resistance in parallel.
The present invention solves above-mentioned technical problem by following technical proposals:
The invention provides a kind of filter unit, be used for the filtering of the rectifying devices such as thyristor, be characterized in, described filter unit comprises 3 groups of electric capacity that are connected in parallel and resistance, and 3 tunnel phase lines of the inlet wire side of frequency converter are 1 group of described electric capacity that is connected in parallel of access in parallel and resistance respectively.
Frequency converter need to access alternating current in electrical network at present, so comprise zero line, ground wire and three phase lines of alternating current transmission in the inlet wire side of frequency converter.Harmonic restraint in realizing every phase line by be connected in parallel on every phase line in three phase lines of inlet wire side one group of electric capacity that is connected in parallel and resistance in the present invention.
Parallel connection described in the present invention refers to that the described electric capacity that is connected in parallel and resistance integral body are connected between the phase line of described frequency converter with respect to frequency converter.
Described filter unit also comprises 1 group of described electric capacity that is connected in parallel and resistance, with before three groups of electric capacity that is connected in parallel and resistance annexation for connecting.
Wherein, described series connection refers to electric capacity that described three groups of electric capacity that are connected in parallel and resistance integral body are connected in parallel with respect to another group and the annexation of resistance integral body.
1 group of electric capacity that is connected in parallel of described filter unit and the other end of resistance are connected together with the ground wire of frequency converter, form altogether.
Preferably, the resistance of described resistance is 1.5M Ω, and the capacitance of described electric capacity is 2.5 μ F.In addition, the user can also adopt based on the needs that harmonic wave suppresses the combination of the appearance value of different resistances and electric capacity.
So described filter unit of the present invention is used for the 150-300KHz frequency range filtering to frequency converter.Be to adopt the combination of the appearance value of above-mentioned resistance and electric capacity to be best suited for the harmonic restraint of 150-300KHz frequency range in frequency converter in the present invention.
Preferably, described filter unit also comprises one or more filters, and described filter is in parallel with described frequency converter in the inlet wire side of described frequency converter.
In addition as mentioned above, can only effectively suppress the harmonic wave of above-mentioned 150-300KHz frequency range due to resistance and Capacitance parallel connection, realize suppressing the harmonic wave of higher frequency so further increase filter in the present invention, thereby suppress further harmonic pollution, optimize electrical network.
In sum, the present invention also provides a kind of frequency converter, is characterized in, described frequency converter comprises filter unit as above.And suppress the harmonic wave of the various frequencies of described frequency converter inlet wire side by described filter unit.
On the basis that meets this area general knowledge, above-mentioned each optimum condition, but combination in any namely get the preferred embodiments of the invention.
Positive progressive effect of the present invention is:
Filter unit of the present invention suppresses harmonic wave by in parallel electric capacity and the resistance of access simply, thereby avoids adding complex structure that filter causes and the rising of cost.
And filter unit installation dimension of the present invention is less, is convenient to be arranged in narrow space, saves installing space.Can suppress significantly in the lower-cost while harmonic wave that rectifying device causes, so successful is practical.
Description of drawings
Fig. 1 is the resolution chart of EMC of the frequency converter of prior art.
Fig. 2 is the structural representation of the filter unit of preferred embodiment of the present invention.
Fig. 3 is the resolution chart of EMC of the frequency converter of preferred embodiment of the present invention.
Embodiment
Mode below by embodiment further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments.
Frequency converter of the present invention is adding filter to suppress on the basis of harmonic wave, and the filter unit that consists of by electric capacity and the resistance that adds by parallel connection further suppresses the harmonic wave that rectification unit causes.
Specifically, as shown in Figure 2, the filter unit of the frequency converter of the present embodiment comprises 4 groups of capacitance resistance groups 1, includes the electric capacity 11 and the resistance 12 that are connected in parallel in each capacitance resistance group 1.
3 groups of capacitance resistance groups 1 (not shown) on three phase lines of the inlet wire side by port L1, port L2 and port L3 access in parallel frequency converter respectively wherein.Same also have on the ground wire of 1 group of capacitance resistance group 1 by the inlet wire side of port PE access in parallel frequency converter.
That is to say, an end of 1 group of capacitance resistance group 1 is connected in three phase lines of inlet wire side of frequency converter, the other end and other three groups of capacitance resistance groups 1 common port N of described capacitance resistance group 1 simultaneously by port L1.
In like manner, also have an end of 1 group of capacitance resistance group 1 to be connected to another root in three phase lines of inlet wire side of frequency converter, the other end and other three groups of capacitance resistance groups 1 common port N of described capacitance resistance group 1 simultaneously by port L2.
Separately have an end of 1 group of capacitance resistance group 1 to be connected to by port L3 and be not connected to port L1 or port L2 one in three phase lines of inlet wire side of frequency converter, simultaneously the other end of described capacitance resistance group 1 also with other three groups of capacitance resistance groups 1 common port N.
Separately have an end of 1 group of capacitance resistance group 1 to be connected to by port PE on the ground wire of inlet wire side of frequency converter, simultaneously the other end of described capacitance resistance group 1 also with other three groups of capacitance resistance groups 1 common port N.
Wherein in the present embodiment, resistance 12 resistances in every group of capacitance resistance group 1 are 1.5M Ω, and the appearance value of the electric capacity 11 in every group of capacitance resistance group 1 is 2.5 μ F.Setting by above-mentioned resistance and appearance value, as shown in Figure 3, compared to Figure 1 the filter unit of the present embodiment is fit to suppress the harmonic wave of frequency converter medium frequency in the 150-300KHz scope at this moment, namely can more effectively suppress by the filter unit that adds the present embodiment the harmonic problem that rectifier cell causes on the basis of filter.Specifically, as shown in Figure 3, the peak limit QP that this moment, actual test obtained and limit in mean AV can be all lower than the EMC(Electro Magnetic Compatibilities in the 150-300KHz of frequency converter scope) peak limit A_QP and the limit in mean A_AV of testing standard EN55011A class standard.So, effectively suppressed the harmonic wave in the frequency converter.
In addition, the user can also correspondingly suppress harmonic wave to the appearance value of electric capacity 11 and the resistance of resistance 12 in each described capacitance resistance group 1 of concrete harmonic wave range regulation of the harmonic effects of frequency converter according to rectifier cell, and the resistance that is not limited only to adopt in the present embodiment and appearance value and the harmonic wave scope that suppresses.
Although more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is limited by appended claims.Those skilled in the art can make various changes or modifications to these execution modes under the prerequisite that does not deviate from principle of the present invention and essence, but these changes and modification all fall into protection scope of the present invention.
Claims (5)
1. a filter unit, be used for the filtering of rectifying device, it is characterized in that, described filter unit comprises 3 groups of electric capacity that are connected in parallel and resistance, and 3 tunnel phase lines of the inlet wire side of frequency converter are 1 group of described electric capacity that is connected in parallel of access in parallel and resistance respectively.
2. filter unit as claimed in claim 1, it is characterized in that, described filter unit also comprises 1 group of described electric capacity that is connected in parallel and resistance, the described electric capacity that is connected in parallel that is connected in parallel with 3 tunnel phase lines of the inlet wire side of frequency converter respectively and resistance string connect the end into the described electric capacity that is connected in parallel of this group and resistance, the other end ground connection of the electric capacity that this group is connected in parallel and resistance.
3. filter unit as claimed in claim 1, is characterized in that, the resistance of described resistance is 1.5M Ω, and the appearance value of described electric capacity is 2.5 μ F.
4. filter unit as claimed in claim 3, is characterized in that, described filter unit also comprises one or more filters, and described filter is in parallel with described frequency converter in the inlet wire side of described frequency converter.
5. a frequency converter, is characterized in that, described frequency converter comprises filter unit as described in any one in claim 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100058309A CN103151908A (en) | 2013-01-08 | 2013-01-08 | Filtering unit and frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100058309A CN103151908A (en) | 2013-01-08 | 2013-01-08 | Filtering unit and frequency converter |
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| Publication Number | Publication Date |
|---|---|
| CN103151908A true CN103151908A (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013100058309A Pending CN103151908A (en) | 2013-01-08 | 2013-01-08 | Filtering unit and frequency converter |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201985770U (en) * | 2011-02-01 | 2011-09-21 | 深圳新贝科技有限公司 | Electronic servo transformer and servo/frequency conversion system |
| CN202261012U (en) * | 2011-09-15 | 2012-05-30 | 上海中电罗莱数码技术有限公司 | EMI (Electro-Magnetic Interference) filter for industrial frequency converter |
| CN102769394A (en) * | 2012-07-20 | 2012-11-07 | 上海交通大学 | Single-phase controllable rectification circuit |
| CN203086326U (en) * | 2013-01-08 | 2013-07-24 | 科比传动技术（上海）有限公司 | Filtering unit and frequency converter |
-
2013
- 2013-01-08 CN CN2013100058309A patent/CN103151908A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201985770U (en) * | 2011-02-01 | 2011-09-21 | 深圳新贝科技有限公司 | Electronic servo transformer and servo/frequency conversion system |
| CN202261012U (en) * | 2011-09-15 | 2012-05-30 | 上海中电罗莱数码技术有限公司 | EMI (Electro-Magnetic Interference) filter for industrial frequency converter |
| CN102769394A (en) * | 2012-07-20 | 2012-11-07 | 上海交通大学 | Single-phase controllable rectification circuit |
| CN203086326U (en) * | 2013-01-08 | 2013-07-24 | 科比传动技术（上海）有限公司 | Filtering unit and frequency converter |
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Application publication date: 20130612 |