CN106712458A - Frequency converter structure with built-in EMI circuit - Google Patents
Frequency converter structure with built-in EMI circuit Download PDFInfo
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- CN106712458A CN106712458A CN201510458545.1A CN201510458545A CN106712458A CN 106712458 A CN106712458 A CN 106712458A CN 201510458545 A CN201510458545 A CN 201510458545A CN 106712458 A CN106712458 A CN 106712458A
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- emi
- frequency changer
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Abstract
The embodiment of the invention relates to a frequency converter structure with a built-in EMI circuit. The frequency converter structure comprises a box body, a fan, a power supply circuit board, and an EMI circuit board. The box body has a top plate and a bottom plate opposite to the top plate. A partition plate is arranged between the top plate and the bottom plate. The box body is divided into an upper chamber and a lower chamber by the partition plate. The bottom plate is made of a conductive material. The partition plate is connected to a heat radiation fin group arranged in the lower chamber. The fan is configured and is corresponding to the lower chamber. The power supply circuit board is fixedly connected to the partition plate and is arranged in the upper chamber. The EMI circuit board is attached to the bottom plate and is arranged in the lower chamber. The power supply circuit board is electrically connected to the EMI circuit board. Therefore, the heat radiation efficiency of the frequency converter structure is improved, a ground contact area is increased, and the common mode suppression ability of middle and high frequency bands is effectively improved.
Description
Technical field
The present invention is related to a kind of frequency changer, the frequency converter knot of espespecially a kind of built-in EMI circuits
Structure.
Background technology
Background technology content.Motor circuit often is controlled using frequency changer on industrial sector, because of power supply
It is also interference source that circuit switches in itself, in order to not influence civil power, then power circuit and mains electricity input end
Between add EMI (Electro Magnetic Interference, electromagnetic interference) wave filter, in order to avoid by itself
Interference reaches shared power network.The annexation of electromagnetic interface filter will between civil power and power circuit,
Electromagnetic interface filter is set to filter two-way next interference.
Traditional frequency conversion device structure mainly includes a plastic casing, a power supply circuit board, an EMI circuits
Plate, a radiating fin group and a fan, power supply circuit board are contained in enclosure interior with EMI circuit boards
Top, EMI circuit boards install a common mode inductance, multiple electric capacity, multiple piezo-resistances and multiple
Resistance, and radiating fin group is installed in power supply circuit board lower section, fan correspondence radiating fin is assembled to be put to help
The element radiating helped on power supply circuit board.Wherein, frequency changer utilizes common mode inductance, electric capacity, pressure
Quick resistance and resistance filter the interference of frequency range to reach.
However, above-mentioned frequency changer has the disadvantages that, one, it is difficult to common mode inductance because of fan
Radiating, causes its temperature too high；Secondly, EMI elements only by input terminal be grounded, cause circuit board
Earthing effect it is not good, will cause medium-high frequency section common mode inhibition capacity reduction.
In view of this, the present inventor is directed to above-mentioned prior art then, and spy concentrates on studies and coordinates scientific principle
With, above-mentioned problem points are solved as possible, become the target of the present inventor's exploitation.
The content of the invention
ㄧ purposes of the invention, are to provide a kind of frequency changer of built-in EMI circuits, its profit
Amplexiformed in base plate and be contained in lower chamber with EMI circuit boards, fan correspondence lower chamber configuration makes
Fan directly radiates to EMI circuit boards, and then improves the radiating efficiency of frequency changer, and
EMI circuit boards can be electrically connected with by base plate and external environment condition, to increase contact area, more effectively
Lifting medium-high frequency section common mode inhibition capacity.
In order to reach above-mentioned purpose, the present invention provides a kind of frequency changer of built-in EMI circuits,
Including：One casing, with relative a top board and a base plate, sets between the top board and the base plate
A separation plate is equipped with, the casing is separated out a upper chamber and a lower chamber by the separation plate,
The base plate is made up of conductive material, and the separation plate is connected with and is contained in the lower chamber
One radiating fin group；One fan, the correspondence lower chamber configuration；One power supply circuit board, is fixed in institute
State separation plate and be contained in the upper chamber；And EMI circuit boards, amplexiform in the bottom
Plate is simultaneously contained in the lower chamber, and the power supply circuit board is electrically connected with the EMI circuit boards.
In an embodiment, be provided with the EMI circuit boards common mode inductance, multiple electric capacity,
Multiple piezo-resistances and multiple resistance.
In an embodiment, the base plate is made up of metal material.
In an embodiment, also including multiple conduits, the multiple conduit is fastened in described respectively
Separate on plate, each conduit has relative one first openend and one second openend,
The power supply circuit board is provided with multiple transmission holes, and each each transmission hole of first openend correspondence is matched somebody with somebody
Put, each second openend correspondence lower chamber is set.
In an embodiment, the end of each second openend is opened towards the described first opening extreme direction
It is provided with a breach.
In an embodiment, the power supply circuit board is in configured in parallel with the EMI circuit boards, often
Conduit described in one defines a center line, and each center line is with the EMI circuit boards in vertical
Straight configuration.
In an embodiment, it also includes a cover plate, and the cover plate is arranged on the base plate with described point
Between spacer member and cover and be placed on the EMI circuit boards, the fan arrangement the separation plate with
Between the cover plate.
In an embodiment, the cover plate encloses and sets out an accommodation space jointly with the base plate, the appearance
It is interconnected with the lower chamber between being empty.
In an embodiment, the cover plate is provided with multiple through holes, each through hole respectively with each institute
The second openend is stated in relative configuration.
In an embodiment, each conduit is a hollow circuit cylinder.
In an embodiment, it also includes a terminal board and an iron core ring, and the terminal board is fixed on institute
State on power supply circuit board, the terminal board is electrically connected with the power supply circuit board, the terminal board sets
There are multiple Plug Divisions, the iron core ring is arranged on inside the terminal board, the iron core ring has one to wear
It is described to wear the Plug Division configuration of mouth correspondence if mouth.
In an embodiment, the spacing distance between the top board and the separation plate is less than the bottom
Spacing distance between plate and the separation plate.
In an embodiment, a switching circuit, multiple inverting elements are installed on the power supply circuit board
And multiple rectifier cells.
The technical scheme of the embodiment of the present invention also has the advantages that：
Firstth, the spatial volume of lower chamber more than upper chamber spatial volume, so by EMI circuits
Plate is placed on when in lower chamber, and adjustable LC value is also larger, enables the filtering of frequency changer
Power is stronger.
Secondth, frequency changer also includes cover plate, and cover plate can reach the work(for covering EMI circuit boards
Effect, to avoid excessive dust deposit in EMI circuit boards.
3rd, common mode inductance, electric capacity, piezo-resistance and resistance are installed on EMI circuit boards, make
EMI circuit boards specially provide the function of filtering power supply noise, and common mode inductance, electric capacity, piezo-resistance
And resistance is concentrated and helped radiate by fan, to avoid EMI element over-temperatures.
4th, frequency changer of the present invention also includes conduit, makes wire rod spacing to avoid by conduit
Wire rod offsets, while conduit is provided with breach, makes operator clearly recognizable in assembling and by wire rod
Import correct position.
5th, frequency changer also includes iron core ring, and iron core ring is arranged on inside terminal board, because of iron core
Ring had a function of noise filtering, more strengthened the filtering noise immune of frequency changer, and allowed client
Voluntarily extra iron core need not be assembled, to lift the ease of use of frequency changer.
Brief description of the drawings
Fig. 1 is the three-dimensional combination figure of frequency changer of the present invention.
Fig. 2 is another three-dimensional combination figure of frequency changer of the present invention.
Fig. 3 is the sectional schematic diagram of frequency changer of the present invention.
Fig. 4 is the another three-dimensional combination figure of frequency changer of the present invention.
Fig. 5 is the sectional perspective enlarged drawing of frequency changer of the present invention.
Fig. 6 is another sectional perspective enlarged drawing of frequency changer of the present invention.
Fig. 7 is the another sectional perspective enlarged drawing of frequency changer of the present invention.
Fig. 8 is another sectional perspective enlarged drawing of frequency changer of the present invention.
Wherein, description of reference numerals is as follows：
10 frequency changers
1 casing
11 top boards
12 base plates
13 separate plate
131 radiating fin groups
14 upper chamber
15 lower chambers
2 fans
3 power supply circuit boards
31 transmission holes
4 EMI circuit boards
41 common mode inductances
42 electric capacity
43 piezo-resistances
44 resistance
5 conduits
51 first openends
52 second openends
53 breach
6 cover plates
61 through holes
7 terminal boards
71 Plug Divisions
8 iron core rings
81 wear mouth
L center lines
S accommodation spaces
100 wire rods
Specific embodiment
Detailed description for the present invention and technology contents, by coordinating, brief description of the drawings is as follows, but appended
Accompanying drawing is not intended to the limitation present invention only as illustrative purposes.
Refer to shown in Fig. 1 to Fig. 8, the present invention provides a kind of frequency converter knot of built-in EMI circuits
Structure, this frequency changer 10 mainly includes a casing 1, a fan 2, a power supply circuit board 3 and
EMI circuit boards 4.
As shown in Figure 1 to Figure 3, casing 1 has relative a top board 11 and a base plate 12, top board
A separation plate 13 is provided between 11 and base plate 12, is separated plate 13 and casing 1 is separated out one
The lower chamber 15 of upper chamber 14 and, base plate 12 is made up of conductive material, is separated plate 13 and is connected
There is a radiating fin group 131, radiating fin group 131 is contained in the inside of lower chamber 15.Wherein,
Base plate 12 is made up of the conducting metal material such as copper, iron.
In addition, top board 11 and the spacing distance a separated between plate 13 are less than base plate 12 and separate
Spacing distance b between plate 13, and the spatial volume of lower chamber 15 is made more than upper chamber 14
Spatial volume.
As shown in Figures 1 to 4, the correspondence of fan 2 lower chamber 15 is configured, and power supply circuit board 3 is affixed
In separating plate 13 and being contained in inside upper chamber 14, power supply circuit board 3 is provided with multiple transmission holes
31, EMI circuit boards 4 are amplexiformed in base plate 12 and are contained in inside lower chamber 15, power supply circuit board 3
It is electrically connected with EMI circuit boards 4.Wherein, be provided with power supply circuit board 3 switching circuit,
Multiple inverting elements and multiple rectifier cells (figure is not indicated), for Switching power；EMI circuits
One common mode inductance 41, multiple electric capacity 42, multiple piezo-resistances 43 and multiple resistance are installed on plate 4
44, for filtering band interference.
As shown in Figure 5 to Figure 6, frequency changer of the present invention 10 also includes multiple conduits 5, respectively
Conduit 5 is fastened in separating on plate 13 respectively, and each conduit 5 has relative 1 first to open
The mouth openend 52 of end 51 and 1 second, each each transmission hole 31 of the correspondence of first openend 51 configures, respectively
The correspondence lower chamber 15 of second openend 52 is set, and the end of every 1 second openend 52 is opened towards first
The mouth direction of end 51 offers a breach 53.
It is further described below, power supply circuit board 3 is in configured in parallel with EMI circuit boards 4, each
Conduit 5 is a hollow circuit cylinder, and each conduit 5 defines center line a L, each center line L
With the perpendicular configuration of EMI circuit boards 4.
Originally as shown in Figures 1 to 4, frequency changer 10 also includes a cover plate 6, and cover plate 6 is set
In base plate 12 and between separating plate 13 and cover and be placed on EMI circuit boards 4, fan 2 is configured in separation
Between plate 13 and cover plate 6.Wherein, cover plate 6 be a ㄇ shape plate bodys, but cover plate 6 or
Other geometry plate bodys, are not limitation with the present embodiment.
In addition, cover plate 6 and base plate 12 enclose and set out an accommodation space s jointly, accommodation space s and lower appearance
Room 15 is interconnected, and cover plate 6 has multiple through holes 61, and each through hole 61 is respectively with each second
Openend 52 is in relative configuration.
As shown in Fig. 7 to Fig. 8, frequency changer of the present invention 10 also includes a terminal board 7 and for this
Iron core ring 8, terminal board 7 is fixed on power supply circuit board 3, and terminal board 7 is electric with power supply circuit board 3
Property connection, terminal board 7 is provided with multiple Plug Divisions 71, and iron core ring 8 is arranged on inside terminal board 7,
Iron core ring 8 has one to wear mouth 81, wears the lower section configuration of the several Plug Divisions 71 of the correspondence of mouth 81.
As shown in Figure 1 to Figure 2, the combination of frequency changer of the present invention 10, it utilizes casing 1 to have
There is relative top board 11 and base plate 12, separation plate 13 be provided between top board 11 and base plate 12,
Separate plate 13 and casing 1 is separated out upper chamber 14 and lower chamber 15, base plate 12 is by conductive material
Constituted, separate plate 13 and be connected with the radiating fin group 131 being contained in lower chamber 15；Wind
The correspondence lower chamber 15 of fan 2 is configured；Power supply circuit board 3 is fixed in separation plate 13 and is contained in appearance
In room 14；EMI circuit boards 4 are amplexiformed in base plate 12 and are contained in lower chamber 15, power circuit
Plate 3 is electrically connected with EMI circuit boards 4.Thereby, EMI circuit boards 4 are contained in lower chamber 15,
The correspondence lower chamber 15 of fan 2 is configured, and fan 2 is directly radiated to EMI circuit boards 4, is entered
And the radiating efficiency of frequency changer 10 is improved, and EMI circuit boards 4 are amplexiformed in base plate 12 and led to
Cross base plate 12 to be electrically connected with external environment condition, to increase contact area, more effectively lift medium-high frequency
The common mode inhibition capacity of section.
In addition, spatial volume of the spatial volume of lower chamber 15 more than upper chamber 14, so by EMI
Circuit board 4 is placed on when in lower chamber 15, adjustable LC value (common mode inductance and X, Y electricity
Capacitance) it is also larger, make the filter capacity of frequency changer 10 stronger.
Furthermore, frequency changer 10 also includes cover plate 6, and cover plate 6 is arranged on base plate 12 and demarcation strip
Between part 13 and cover and be placed on EMI circuit boards 4, fan 2 configure separate plate 13 and cover plate 6 it
Between, cover plate 6 is reached the effect for covering EMI circuit boards 4, to avoid excessive dust deposit
In EMI circuit boards 4, while setting out accommodation space s because cover plate 6 and base plate 12 enclose jointly, house
Space s is interconnected with lower chamber 15, so the fraction of fan 2 can enter accommodation space s
It is interior, and then take away the heat that the heat or EMI circuit boards 4 of EMI circuit boards 4 are transferred to cover plate 6.
As shown in figure 4, being provided with common mode inductance 41, several electric capacity 42, number on EMI circuit boards 4
Individual piezo-resistance 43 and several resistance 44, make EMI circuit boards 4 specially provide filtering power supply noise
Function, and common mode inductance 41, electric capacity 42, piezo-resistance 43 and resistance 44 easily produce heat,
Therefore hotter electronic component is concentrated and helps radiate by fan 2, have to reach frequency changer 10
Excellent radiating efficiency.
As shown in Figures 4 to 6, power supply circuit board 3 needs wire rod 100 to lead with EMI circuit boards 4
It is logical, and to save configuration space and avoiding bending wire from causing extra electromagnetic interference, wire rod 100 is use up
May be in the way of straight up and down and power supply circuit board 3 and the perpendicular connection of EMI circuit boards 4.Cause
This, frequency changer of the present invention 10 also includes multiple conduits 5, allows wire rod 100 to be arranged in wire
I.e. must be electrical with power supply circuit board 3, EMI circuit boards 4 in the way of straight up and down by limitation in pipe 5
Connection, while wire rod 100 is spacing to avoid wire rod 100 from offseting by conduit 5, enables conduit 5
Guiding wire rod 100 one end wears transmission hole 31 and is electrically connected with power supply circuit board 3, and the other end wears
Through hole 61 is electrically connected with EMI circuit boards 4.
In addition, the second openend 52 of each conduit 5 is provided with breach 53, make operator in assembling
When it is clearly recognizable and wire rod 100 is imported into correct position.
As shown in Fig. 7 to Fig. 8, frequency changer of the present invention 10 also includes iron core ring 8, iron core ring 8
It is arranged on inside terminal board 7, iron core ring 8 wears the several grafting of correspondence of mouth 81 with mouth 81 is worn
The lower section configuration in portion 71, had the function of noise filtering because of iron core ring 8, more strengthened frequency changer
10 filtering noise immune.Also, frequency changer of the present invention 10 is directly under Plug Division 71
Iron core ring 8 is installed by side, so client voluntarily extra need not assemble iron core, to lift frequency changer 10
Ease of use.
As shown in Fig. 4 to Fig. 8, the use state of frequency changer of the present invention 10 filters power supply
The flow of noise is that civil power (not shown) is mutually butted with Plug Division 71, then by wire rod 100
EMI circuit boards 4 are electrically connected with, it is also interference source to switch in itself because of power circuit, in order to not influence city
Electricity, then adds EMI circuit boards 4 between civil power and power supply circuit board 3, in order to avoid itself is disturbed
Shared power network is reached, so on current path, the annexation of EMI circuit boards 4 will be between civil power
Between power supply circuit board 3, electromagnetic interface filter is set to filter two-way next interference.Thereby, EMI
Circuit board 4 reaches the function of filtering power supply noise, and the power supply after filtering leads back on power supply circuit board 3 again,
Frequency changer 10 is set to complete the purpose of filtering power supply noise.
In sum, the frequency changer of built-in EMI circuits of the invention, had not also seen similar
Product and disclosure are used, and with industry applications, novelty and progressive, are complied fully with new special
Profit application important document, hence files an application according to Patent Law, detailed survey and quasi- this case patent please be grant, to ensure hair
The right of a person of good sense.
Claims (13)
1. a kind of frequency changer of built-in EMI circuits, including：One casing, with relative one
Top board and a base plate, are provided with a separation plate, the demarcation strip between the top board and the base plate
The casing is separated out a upper chamber and a lower chamber by part, and the base plate is made up of conductive material,
The separation plate is connected with the radiating fin group being contained in the lower chamber；One fan, correspondence
The lower chamber configuration；One power supply circuit board, is fixed in the separation plate and is contained in the upper appearance
It is indoor；And EMI circuit boards, amplexiform in the base plate and be contained in the lower chamber, institute
Power supply circuit board is stated to be electrically connected with the EMI circuit boards.
2. the frequency changer of built-in EMI circuits as claimed in claim 1, it is characterised in that
One common mode inductance, multiple electric capacity, multiple piezo-resistances and multiple are installed on the EMI circuit boards
Resistance.
3. the frequency changer of built-in EMI circuits as claimed in claim 1, it is characterised in that
The base plate is made up of metal material.
4. the frequency changer of built-in EMI circuits as claimed in claim 1, it is characterised in that
Also include multiple conduits, the multiple conduit fastens separate on plate in described respectively, Mei Yisuo
Stating conduit has relative one first openend and one second openend, and the power supply circuit board is provided with
Multiple transmission holes, each each transmission hole configuration of first openend correspondence, each second opening
The end correspondence lower chamber is set.
5. the frequency changer of built-in EMI circuits as claimed in claim 4, it is characterised in that
The end of each second openend offers a breach towards the described first opening extreme direction.
6. the frequency changer of built-in EMI circuits as claimed in claim 4, it is characterised in that
The power supply circuit board is in configured in parallel with the EMI circuit boards, and each conduit is defined
One center line, each center line and the perpendicular configuration of EMI circuit boards.
7. the frequency changer of built-in EMI circuits as claimed in claim 4, it is characterised in that
It also includes a cover plate, and the cover plate is arranged between the base plate and the separation plate and covers and is placed on
The EMI circuit boards, the fan arrangement is between the separation plate and the cover plate.
8. the frequency changer of built-in EMI circuits as claimed in claim 7, it is characterised in that
The cover plate encloses and sets out an accommodation space jointly with the base plate, the accommodation space and the lower chamber
It is interconnected.
9. the frequency changer of built-in EMI circuits as claimed in claim 7, it is characterised in that
The cover plate is provided with multiple through holes, and each through hole is respectively with each second openend in relative
Configuration.
10. the frequency changer of built-in EMI circuits as claimed in claim 4, it is characterised in that
Each conduit is a hollow circuit cylinder.
The frequency changer of 11. built-in EMI circuits as claimed in claim 1, it is characterised in that
It also includes a terminal board and an iron core ring, and the terminal board is fixed on the power supply circuit board, institute
State terminal board to be electrically connected with the power supply circuit board, the terminal board is provided with multiple Plug Divisions, described
Iron core ring is arranged on inside the terminal board, and the iron core ring has one to wear mouth, and described to wear mouth right
The Plug Division is answered to configure.
The frequency changer of 12. built-in EMI circuits as claimed in claim 1, it is characterised in that
Spacing distance between the top board and the separation plate is less than the base plate and the separation plate
Between spacing distance.
The frequency changer of 13. built-in EMI circuits as claimed in claim 1, it is characterised in that
One switching circuit, multiple inverting elements and multiple rectifier cells are installed on the power supply circuit board.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811474449.6A CN109936278B (en) | 2015-07-30 | 2015-07-30 | Frequency converter structure with built-in EMI circuit |
| CN201510458545.1A CN106712458B (en) | 2015-07-30 | 2015-07-30 | The frequency changer of built-in EMI circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510458545.1A CN106712458B (en) | 2015-07-30 | 2015-07-30 | The frequency changer of built-in EMI circuit |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811474449.6A Division CN109936278B (en) | 2015-07-30 | 2015-07-30 | Frequency converter structure with built-in EMI circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106712458A true CN106712458A (en) | 2017-05-24 |
| CN106712458B CN106712458B (en) | 2018-12-14 |
Family
ID=58901641
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811474449.6A Active CN109936278B (en) | 2015-07-30 | 2015-07-30 | Frequency converter structure with built-in EMI circuit |
| CN201510458545.1A Active CN106712458B (en) | 2015-07-30 | 2015-07-30 | The frequency changer of built-in EMI circuit |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811474449.6A Active CN109936278B (en) | 2015-07-30 | 2015-07-30 | Frequency converter structure with built-in EMI circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN109936278B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110798054A (en) * | 2019-11-28 | 2020-02-14 | 滁州博格韦尔电气有限公司 | Special mirror image type harmonic filter for rail transit |
| CN112272470A (en) * | 2020-10-22 | 2021-01-26 | 贵州航天电子科技有限公司 | Signal digital processor |
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| CN204013197U (en) * | 2014-09-02 | 2014-12-10 | 深圳市佛斯特科技有限公司 | A kind of frequency converter |
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| JP4423462B2 (en) * | 2003-12-22 | 2010-03-03 | 富士電機システムズ株式会社 | Semiconductor power module |
| CN1790813A (en) * | 2004-12-15 | 2006-06-21 | 上海乐金广电电子有限公司 | Connection structure of printed circuit board and its making method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW560122B (en) * | 2001-12-06 | 2003-11-01 | Delta Electronics Inc | Power converter |
| JP2006025467A (en) * | 2002-02-26 | 2006-01-26 | Keio Gijuku | System employing power converter |
| US7254034B2 (en) * | 2004-12-15 | 2007-08-07 | Lucent Technologies Inc. | Thermal management for shielded circuit packs |
| US20080055861A1 (en) * | 2006-08-31 | 2008-03-06 | Nintendo Co., Ltd. | Electronic appliance |
| CN201341297Y (en) * | 2008-12-12 | 2009-11-04 | 艾默生网络能源有限公司 | Installing structure of EMI filter board |
| CN203149471U (en) * | 2012-12-18 | 2013-08-21 | 南京烽火星空通信发展有限公司 | Optimized heat dissipation case structure |
| CN103368377A (en) * | 2013-07-17 | 2013-10-23 | 华南理工大学 | Preceding-stage EMI filtering protective circuit of driving power source |
| CN204013197U (en) * | 2014-09-02 | 2014-12-10 | 深圳市佛斯特科技有限公司 | A kind of frequency converter |
| CN104795968A (en) * | 2015-04-03 | 2015-07-22 | 南车株洲电力机车研究所有限公司 | Frequency changer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110798054A (en) * | 2019-11-28 | 2020-02-14 | 滁州博格韦尔电气有限公司 | Special mirror image type harmonic filter for rail transit |
| CN112272470A (en) * | 2020-10-22 | 2021-01-26 | 贵州航天电子科技有限公司 | Signal digital processor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109936278A (en) | 2019-06-25 |
| CN109936278B (en) | 2021-10-15 |
| CN106712458B (en) | 2018-12-14 |
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