CN103595242A - A power supply filter capable of suppressing overvoltage surges - Google Patents
A power supply filter capable of suppressing overvoltage surges Download PDFInfo
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- CN103595242A CN103595242A CN201210286129.4A CN201210286129A CN103595242A CN 103595242 A CN103595242 A CN 103595242A CN 201210286129 A CN201210286129 A CN 201210286129A CN 103595242 A CN103595242 A CN 103595242A
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- power
- overvoltage
- supply filter
- housing
- surged
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Abstract
The invention discloses a power supply filter capable of suppressing overvoltage surges. The power supply filter capable of suppressing the overvoltage surges comprises a housing (1), two input terminals (2) and two output terminals (3). The two input terminals (2) and the two output terminals (3) are arranged on the housing (1) A filtering unit and an overvoltage suppressing unit are arranged inside the housing (1). An input end of the filtering unit is connected with the input terminals (2). An output end of the filtering unit is connected with the output terminals (3). The filtering unit comprises a common-mode circuit and a differential mode circuit. The overvoltage suppressing unit comprises an electronic switch K1 in series connection with an output positive end of the filtering unit. The beneficial effects of the power supply filter capable of suppressing the overvoltage surges of present invention are that: the overvoltage inhibition unit is added; and when the overvoltage surges appear, and the voltage of the surges reaches a threshold voltage of the overvoltage suppressing unit, rapid cutting-off is carried out on a positive end of a power supply, and a load device is protected.
Description
Technical field
The present invention relates to the filter that the various EMI noises in power supply are filtered, particularly relate to the power-supply filter that a kind of energy over-voltage suppression is surged.
Background technology
Along with the develop rapidly of modern science and technology, electronics, power electronics, electric equipment application are more and more extensive, and their be in operation high density producing, the electromagnetic signal of wide spectrum are full of whole space, form complicated electromagnetic environment.Complicated electromagnetic environment requirements electronic equipment and power supply have higher Electro Magnetic Compatibility.So suppressing the technology of electromagnetic interference also more and more comes into one's own.Ground connection, shielding and filtering are the three large measures that suppress electromagnetic interference, below the electromagnetic interface filter that uses in power supply of article and basic principle thereof and correct application process.
The power supply of electronic equipment, as 220V/50Hz AC network or 115V/400Hz alternating current generator, all there is EMI noise miscellaneous, artificial EMI interference source wherein, as the radio transmission signal of the equipment such as various radars, navigation, communication, can on power line and on the stube cable of electronic equipment, induce electromagnetic interference signal, electric rotary machine and ignition system can produce transient process and radiated noise and disturb in perceptual load circuit; Also have natural disturbance source, such as atmospherics noise in thunder discharge phenomenon and universe, the former duration is short but energy is very large, and the latter's frequency range is very wide.When electronic circuit components and parts itself are worked in addition, also can produce thermal noise etc.
These electromagnetic interference noises, the mode by radiation and conduction coupling, can affect the normal operation of the various electronic equipments that move in this environment.
On the other hand, electronic equipment also can produce various electromagnetic interference noises when work.Such as digital circuit is to adopt pulse signal (square wave) to carry out presentation logic relation, its impulse waveform is carried out to fourier analysis known, its harmonic spectrum scope is very wide.In digital circuit, also have in addition the pulse train of multiple repetition rate, the harmonic wave that these pulse trains comprise is abundanter, and frequency spectrum is wider, and the electromagnetic interference noise of generation is also more complicated.
All kinds of stabilized voltage power supplys itself are also a kind of electromagnetic interference sources.In linear stabilized power supply, the unidirectional pulsating current forming because of rectification also can cause electromagnetic interference; It is little that Switching Power Supply has volume, the advantage that efficiency is high, and in modern electronic equipment, application is more and more extensive, but because it when power conversion on off state, itself be exactly very strong EMI noise source, the existing very wide frequency range of EMI noise of its generation, has again very high intensity.These electromagnetic interference noises pollute electromagnetic environment by the mode of radiation and conduction too, thereby affect the normal operation of other electronic equipment.
Concerning electronic equipment, when analog circuit is arrived in EMI noise effect, can make the signal to noise ratio of signal transmission degenerate, when serious, can make the signal that will transmit be flooded by EMI noise, and cannot process.When EMI noise effect is when the digital circuit, can cause that logical relation makes mistakes, the result leading to errors.
For power-supply device, its inside, except power conversion circuit, also has drive circuit, control circuit, protective circuit, output and input level testing circuit etc., circuit very complex.These main circuits will consist of universal or special integrated circuit, while there is misoperation when being subject to electromagnetic interference, can make power supply quit work, and cause electronic equipment to work.Adopt electric network noise filter can effectively prevent that power supply from producing misoperation because of external electromagnetic noise interference.
In addition, the EMI noise entering from power input, its part can appear at the output of power supply, and it can produce induced voltage in the load circuit of power supply, becomes the reason that circuit produces signal transmission in misoperation or interfered circuit.These problems equally also available noise filter are prevented.
The existing power-supply filter for airborne anti-electromagnetic interference, great majority adopt L, C device, the working power of onboard instrument is all generally+28V, the maximum power supply that can bear is+40V, a lot of onboard instruments must still can work under overvoltage surge conditions occurring, like this power-supply filter has just been had to requirement, but existing power-supply filter generally all can not be surged by over-voltage suppression.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, the power-supply filter of can over-voltage suppression surging is provided, solve in prior art the shortcoming of can not over-voltage suppression surging.
Object of the present invention is achieved through the following technical solutions: the power-supply filter that energy over-voltage suppression is surged, comprise housing and be arranged on two input terminals on housing, two lead-out terminals, in housing, be provided with filter unit and Overvoltage suppressing unit, the input of described filter unit connects input terminal, output connects lead-out terminal, it comprises common-mode circuit and differential mode circuit, and the Overvoltage suppressing unit of telling comprises the electronic switch K that is serially connected in filter unit output plus terminal
1.
Described common-mode circuit comprises common mode inductance L
1, L
2and common mode capacitance C
y1, C
y2, described differential mode circuit comprises differential mode capacitor C
x.
Described differential mode capacitor C
xon be parallel with a discharge resistance R.
Described Overvoltage suppressing unit also comprises a storage capacitor C
1, described storage capacitor C
1the positive and negative two ends that connect respectively filter unit output.
On described housing, be provided with mounting ear.
On described housing, be also provided with an earth terminal.
The invention has the beneficial effects as follows: added an Overvoltage suppressing unit, when overvoltage, surged while occurring, when the voltage of surging reaches the threshold voltage of Overvoltage suppressing unit, the anode of power supply has been blocked fast, protected load equipment.
Accompanying drawing explanation
Fig. 1 is external structure schematic diagram of the present invention;
Fig. 2 is internal circuit configuration schematic diagram of the present invention;
In figure, 1-housing, 2-input terminal, 3-lead-out terminal, 4-mounting ear, 5-earth terminal.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but structure of the present invention is not limited only to following examples:
[embodiment]
As shown in Figure 1 and Figure 2, the power-supply filter that energy over-voltage suppression is surged, comprise housing 1 and be arranged on two input terminals on housing 12, two lead-out terminals 3, in housing 1, be provided with filter unit and Overvoltage suppressing unit, the input of described filter unit connects input terminal 2, output connects lead-out terminal 3, and it comprises common-mode circuit and differential mode circuit, and the Overvoltage suppressing unit of telling comprises the electronic switch K that is serially connected in filter unit output plus terminal
1.
Described common-mode circuit comprises common mode inductance L
1, L
2and common mode capacitance C
y1, C
y2, described differential mode circuit comprises differential mode capacitor C
x.
Described differential mode capacitor C
xon be parallel with a discharge resistance R.
Described Overvoltage suppressing unit also comprises a storage capacitor C
1, described storage capacitor C
1the positive and negative two ends that connect respectively filter unit output.
On described housing 1, be provided with mounting ear 4, for fixing of this device.On housing 1, be also provided with an earth terminal 5, for the ground connection of installing, use.
Claims (6)
1. the power-supply filter that energy over-voltage suppression is surged, it is characterized in that, comprise housing (1) and be arranged on two input terminals (2), two lead-out terminals (3) on housing (1), in housing (1), be provided with filter unit and Overvoltage suppressing unit, the input of described filter unit connects input terminal (2), output connects lead-out terminal (3), it comprises common-mode circuit and differential mode circuit, and the Overvoltage suppressing unit of telling comprises the electronic switch K that is serially connected in filter unit output plus terminal
1.
2. the power-supply filter that energy over-voltage suppression according to claim 1 is surged, is characterized in that, described common-mode circuit comprises common mode inductance L
1, L
2and common mode capacitance C
y1, C
y2, described differential mode circuit comprises differential mode capacitor C
x.
3. the power-supply filter that energy over-voltage suppression according to claim 2 is surged, is characterized in that described differential mode capacitor C
xon be parallel with a discharge resistance R.
4. according to the power-supply filter that in claim 1～3, arbitrary described energy over-voltage suppression is surged, it is characterized in that, described Overvoltage suppressing unit also comprises a storage capacitor C
1, described storage capacitor C
1the positive and negative two ends that connect respectively filter unit output.
5. the power-supply filter that energy over-voltage suppression according to claim 4 is surged, is characterized in that, is provided with mounting ear (4) on described housing (1).
6. the power-supply filter that energy over-voltage suppression according to claim 5 is surged, is characterized in that, is also provided with an earth terminal (5) on described housing (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210286129.4A CN103595242A (en) | 2012-08-13 | 2012-08-13 | A power supply filter capable of suppressing overvoltage surges |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210286129.4A CN103595242A (en) | 2012-08-13 | 2012-08-13 | A power supply filter capable of suppressing overvoltage surges |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103595242A true CN103595242A (en) | 2014-02-19 |
Family
ID=50085262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210286129.4A Pending CN103595242A (en) | 2012-08-13 | 2012-08-13 | A power supply filter capable of suppressing overvoltage surges |
Country Status (1)
| Country | Link |
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| CN (1) | CN103595242A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124743A (en) * | 2014-07-25 | 2014-10-29 | 株洲南车时代电气股份有限公司 | Storage battery charging device |
| CN104333340A (en) * | 2014-09-30 | 2015-02-04 | 成都思迈科技发展有限责任公司 | Electromagnetic interference filter |
| CN108768160A (en) * | 2018-07-19 | 2018-11-06 | 深圳振华富电子有限公司 | EMI power filter |
| CN108808647A (en) * | 2018-07-25 | 2018-11-13 | 安徽硕日光电科技有限公司 | A kind of secondary overvoltage protector |
| CN109560786A (en) * | 2018-12-25 | 2019-04-02 | 西安理工大学 | High-speed rail trailer system has grade regulation rejection band electromagnetic interface filter and design method |
| CN113928403A (en) * | 2020-06-29 | 2022-01-14 | 北京新能源汽车股份有限公司 | Interference filtering circuit of steering wheel and electric automobile |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6040969A (en) * | 1998-08-04 | 2000-03-21 | Electronic Systems Protection, Inc. | Power filter circuit responsive to supply system fault conditions |
| CN201435604Y (en) * | 2009-01-05 | 2010-03-31 | 成都新欣神风电子科技有限公司 | Power supply wave filter |
| CN202696463U (en) * | 2012-08-13 | 2013-01-23 | 成都思迈科技发展有限责任公司 | Power supply filter capable of inhibiting overvoltage surge |
-
2012
- 2012-08-13 CN CN201210286129.4A patent/CN103595242A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6040969A (en) * | 1998-08-04 | 2000-03-21 | Electronic Systems Protection, Inc. | Power filter circuit responsive to supply system fault conditions |
| CN201435604Y (en) * | 2009-01-05 | 2010-03-31 | 成都新欣神风电子科技有限公司 | Power supply wave filter |
| CN202696463U (en) * | 2012-08-13 | 2013-01-23 | 成都思迈科技发展有限责任公司 | Power supply filter capable of inhibiting overvoltage surge |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124743A (en) * | 2014-07-25 | 2014-10-29 | 株洲南车时代电气股份有限公司 | Storage battery charging device |
| CN104124743B (en) * | 2014-07-25 | 2017-01-11 | 株洲南车时代电气股份有限公司 | Storage battery charging device |
| CN104333340A (en) * | 2014-09-30 | 2015-02-04 | 成都思迈科技发展有限责任公司 | Electromagnetic interference filter |
| CN108768160A (en) * | 2018-07-19 | 2018-11-06 | 深圳振华富电子有限公司 | EMI power filter |
| CN108808647A (en) * | 2018-07-25 | 2018-11-13 | 安徽硕日光电科技有限公司 | A kind of secondary overvoltage protector |
| CN109560786A (en) * | 2018-12-25 | 2019-04-02 | 西安理工大学 | High-speed rail trailer system has grade regulation rejection band electromagnetic interface filter and design method |
| CN113928403A (en) * | 2020-06-29 | 2022-01-14 | 北京新能源汽车股份有限公司 | Interference filtering circuit of steering wheel and electric automobile |
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Application publication date: 20140219 |