CN202455074U

CN202455074U - High-power emi filter

Info

Publication number: CN202455074U
Application number: CN201220029531XU
Authority: CN
Inventors: 邵瑞; 赵浩
Original assignee: SUZHOU TOPRUN ELECTRIC EQUIPMENT CO Ltd
Current assignee: SUZHOU TOPRUN ELECTRIC EQUIPMENT CO Ltd
Priority date: 2012-01-30
Filing date: 2012-01-30
Publication date: 2012-09-26
Anticipated expiration: 2022-01-30

Abstract

The utility model discloses a high-power EMI (Electro-Magnetic Interference) filter, which comprises a three-phase current output load end and a three-phases current input load end, wherein a difference-mode inductor L1, a common-mode inductor L2 and a common-mode inductor L3 are sequentially connected in series between each phase of current output load end and each phase of current input load in series; the difference-mode inductor L1 is connected with a difference-mode capacitor C1X and a common-mode capacitor C1Y to form a first-order filter; the common-mode inductor L2 is connected with a difference-mode capacitor C2X and a common-mode capacitor C2Y to form a second-order filter; the common-mode inductor L3 is connected with a difference-mode capacitor C3X and a common-mode capacitor C3Y to form a third-order filter; the difference-mode capacitors C1X, C2X and C3X are bridged between a phase wire and a center wire; and the common-mode capacitor C1Y, C2X and C3Y are bridged between the center wire and a ground wire. According to the high-power EMI filter provided by the utility model, the performance and the safety of the filter under large current can be ensured, and EMC (Electro Magnetic Compatibility) filtering in a large-current high-power system can be met.

Description

High-power electromagnetic interface filter

Technical field

The utility model relates to a kind of filter, relates in particular to a kind of high-power electromagnetic interface filter.

Background technology

Along with the non-linear equipment that is the basis with the modern power electronic device uses in a large number, Switching Power Supply for example, frequency converters etc. inject a large amount of radio-frequency components to electrical network, pollute electrical network, disturb the neighbouring device operate as normal.Especially for solar energy in the present new forms of energy, the current transformer that wind energy is used, and network process in, if do not handle the EMI problem, then have a large amount of radio-frequency components and cause equipment fault, the damage problem.

Frequency signal access arrangement when the low-pass filter circuit that electromagnetic interface filter is made up of series reactor and shunt capacitor usually, its effect are permission equipment operate as normal, and the interference signal of high frequency is had bigger inhibition.Had a large amount of filters using in the market, but be mainly single-phase, little electric current (tens peaces) filter.Since wind energy, inverter output currents such as solar energy, and voltage contains radio-frequency component; Inverter power is constantly being done greatly simultaneously, and therefore, existing filter can not satisfy photovoltaic well; Wind power generation, track traffic, charging pile; And the filtering demand in high-power industrial drives field, therefore, be necessary to provide high-power electromagnetic interface filter.

The utility model content

The utility model technical problem to be solved provides a kind of high-power electromagnetic interface filter; Electromagnetic interference noise when not only effectively reducing inverter and being incorporated into the power networks; Avoid power grid environment is polluted; And can guarantee the performance and the safety of filter under the big electric current, satisfy big electric current, the EMC filtering in the high-power system.

The utility model is to solve the problems of the technologies described above the technical scheme that adopts to provide a kind of high-power electromagnetic interface filter; Comprise three-phase current output loading end and three-phase current input; Wherein, be in series with differential mode inductance L1, common mode inductance L2 and common mode inductance L3 between every phase current output loading end and the input successively; Said differential mode inductance L1 links to each other with differential mode capacitor C1X, common mode capacitance C1Y and forms the first rank filter; Said common mode inductance L2 links to each other with differential mode capacitor C2X, common mode capacitance C2Y and forms the second rank filter; Said common mode inductance L3 links to each other with differential mode capacitor C3X, common mode capacitance C3Y and forms the 3rd rank filter; Said differential mode capacitor C1X, C2X and C3X are connected across between phase line and the center line, and said common mode capacitance C1Y, C2Y and C3Y are connected across between center line and the ground wire.

Above-mentioned high-power electromagnetic interface filter, wherein, the common mode inductance L3 front end of every circuitry phase links to each other with differential mode capacitor C4X and forms filter circuit, and said differential mode capacitor C4X is connected across between phase line and the center line.

Above-mentioned high-power electromagnetic interface filter, wherein, differential mode capacitor C1X, C2X, C3X and C4X in the three-phase circuit are Y-connection.

The utility model contrast prior art has following beneficial effect: the high-power electromagnetic interface filter that the utility model provides; Through three rank filter circuits being set, progressively weaken to get into the electric network electromagnet noise, the electromagnetic interference noise when effectively reducing inverter and being incorporated into the power networks at three-phase current output loading end and three-phase current input; Avoid power grid environment is polluted; The filtering of every rank effectively avoids the magnetic material heating saturated to the characteristics filtering of inverter, thereby guarantees the performance and the safety of filter under the big electric current.

Description of drawings

Fig. 1 is the high-power electromagnetic interface filter circuit diagram of the utility model.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is done further to describe.

See also Fig. 1; The high-power electromagnetic interface filter that the utility model provides comprises three-phase current output loading end and three-phase current input; Wherein, be in series with differential mode inductance L1, common mode inductance L2 and common mode inductance L3 between every phase current output loading end and the input successively; Said differential mode inductance L1 links to each other with differential mode capacitor C1X, common mode capacitance C1Y and forms the first rank filter; Said common mode inductance L2 links to each other with differential mode capacitor C2X, common mode capacitance C2Y and forms the second rank filter; Said common mode inductance L3 links to each other with differential mode capacitor C3X, common mode capacitance C3Y and forms the 3rd rank filter; Said differential mode capacitor C1X, C2X and C3X are connected across between phase line and the center line, and said common mode capacitance C1Y, C2Y and C3Y are connected across between center line and the ground wire PE.

The high-power electromagnetic interface filter that the utility model provides, wherein, the common mode inductance L3 front end of every circuitry phase links to each other with differential mode capacitor C4X and forms filter circuit, and said differential mode capacitor C4X is connected across between phase line and the center line.

The high-power electromagnetic interface filter that the utility model provides, signal flow are to as follows: the three-phase current input is In1, In2 and In3, and three-phase current output loading end is Out1, Out2 and Out3; Electromagnetic interference noise gets into filter circuit by load end; C1X electric capacity filtering DM EMI, C1Y filtering common mode disturbances, L1 is a differential mode inductance; Reflection also absorbs the differential mode electromagnetic noise, more than is preliminary filtering.Electromagnetic noise again by C2YI electric capacity, gets into the further filtering common mode disturbances of L2 common mode inductance noise behind the C2X capacitor filtering after preliminary filtering.And then entering C3Y electric capacity, C3X electric capacity, L3 common mode inductance, C4X capacitor filtering.More than constitute filter three rank filtering measure.Differential mode capacitor C1X, C2X, C3X and C4X in the three-phase circuit are Y-connection; Each electric capacity two ends is parallel with resistance, and (capacitor C 4X two ends can parallel resistance; But decide according to capacitance size, mainly be to consider the capacitance discharges time), launch no longer one by one to detail at this; Electric current is up to 2500A, the highest 690VAC of voltage.

Since wind energy, inverter output currents such as solar energy, and voltage contains radio-frequency component; Simultaneously inverter power is constantly being done greatly, and the utility model adopts three rank filtering, the electromagnetic interference noise in the time of not only can effectively reducing inverter and be incorporated into the power networks; Avoid power grid environment is polluted, and the entering of weakening step by step electric network electromagnet noise, the filtering of every rank all is directed against the characteristics filtering of inverter; Effectively avoid the magnetic material heating saturated, thereby guarantee the performance and the safety of filter under the big electric current.Adopt common mode inductance in the whole filter three rank filtering, differential mode inductance is reasonably combined, realizes the optimum filtering effect, practices thrift cost.

The high-power electromagnetic interface filter that the utility model provides all adopts copper bus-bar to come bearing great current as conductor, filter power consumption, and it is very little to generate heat, and overload capacity is strong; Select for use the overhang insulation working of plastics of high insulation also to guarantee enough insulation distances and dielectric strength simultaneously.

Though the utility model discloses as above with preferred embodiment; Right its is not in order to limit the utility model; Any those skilled in the art; In spirit that does not break away from the utility model and scope, when can doing a little modification and perfect, so the protection range of the utility model is when being as the criterion with what claims defined.

Claims

1. a high-power electromagnetic interface filter comprises three-phase current output loading end and three-phase current input, it is characterized in that, is in series with differential mode inductance L1, common mode inductance L2 and common mode inductance L3 between every phase current output loading end and the input successively; Said differential mode inductance L1 links to each other with differential mode capacitor C1X, common mode capacitance C1Y and forms the first rank filter; Said common mode inductance L2 links to each other with differential mode capacitor C2X, common mode capacitance C2Y and forms the second rank filter; Said common mode inductance L3 links to each other with differential mode capacitor C3X, common mode capacitance C3Y and forms the 3rd rank filter; Said differential mode capacitor C1X, C2X and C3X are connected across between phase line and the center line, and said common mode capacitance C1Y, C2Y and C3Y are connected across between center line and the ground wire.

2. high-power electromagnetic interface filter as claimed in claim 1 is characterized in that, the common mode inductance L3 front end of every circuitry phase links to each other with differential mode capacitor C4X and forms filter circuit, and said differential mode capacitor C4X is connected across between phase line and the center line.

3. high-power electromagnetic interface filter as claimed in claim 1 is characterized in that, differential mode capacitor C1X, C2X, C3X and C4X in the three-phase circuit are Y-connection.