CN207304373U - A kind of combination EMI filtering and the circuit of soft start - Google Patents
A kind of combination EMI filtering and the circuit of soft start Download PDFInfo
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- CN207304373U CN207304373U CN201721138177.3U CN201721138177U CN207304373U CN 207304373 U CN207304373 U CN 207304373U CN 201721138177 U CN201721138177 U CN 201721138177U CN 207304373 U CN207304373 U CN 207304373U
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- 238000001914 filtration Methods 0.000 title claims abstract description 59
- 239000003990 capacitor Substances 0.000 claims description 31
- 238000004804 winding Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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Abstract
A kind of combination EMI filtering described in the utility model and the circuit of soft start, including EMI filter circuit, filter circuit includes common mode filtering inductance L1, further include at least one soft starting circuit, the drain electrode that the soft starting circuit includes MOSFET pipes V1, MOSFET pipe V1 is connected with the input negative terminal of common mode filtering inductance L1 in EMI filter circuit；The soft starting circuit includes bleeder circuit, and bleeder circuit one end is connected with external input anode and the common mode filtering inductance L1 input positive terminals, and the other end with external input is connected；The soft starting circuit includes start-up capacitance, and grid, source electrode of the start-up capacitance both ends respectively with MOSFET pipes V1 are connected；Grid, the source electrode of MOSFET pipes V1 is connected with the both ends of bleeder circuit respectively at the same time, and wherein source electrode is connected with connecing external input.Soft starting circuit and EMI filter circuit Combination Design not only filter out EMI noise, also inhibits power-on surge current, ensure that the steady operation of circuit, the reliability of circuit is improved by the utility model.
Description
Technical field
The utility model is related to power electronic equipment system regions, and in particular to a kind of circuit of combination EMI filtering and its
Control method.
Background technology
Electric power system is indispensable part in various electronic equipments, development and system collection with military hardware
The raising of Cheng Du, the working environment of electronic equipment become increasingly complex, wherein the EMI noise of internal system and power-on surge current band
The influence come is especially prominent, is related to complete machine working performance and service life.Common solution method is the input terminal in equipment
Increase EMI power-supply filters, can so effectively filter out EMI noise, but the impact of power-on surge current formation can not be eliminated.
The content of the invention
The technical problems to be solved in the utility model is to be combined by EMI filter circuit with soft starting circuit, is designed
It is adapted to the entry circuit of the power electronic equipment part of highly reliable application scenario, the circuit topological structure is simple in structure, and work is steady
Determine reliable, good application effect, improve the global reliability of equipment.
The technical solution of the utility model is：
A kind of combination EMI filtering and the circuit of soft start, including EMI filter circuit, filter circuit include common mode filtering electricity
Feel L1, further include at least one soft starting circuit, the soft starting circuit include MOSFET pipes V1, MOSFET pipe V1 drain electrode and
The input negative terminal of common mode filtering inductance L1 is connected in EMI filter circuit；The soft starting circuit includes bleeder circuit, partial pressure electricity
Road one end is connected with external input anode and the common mode filtering inductance L1 input positive terminals, the other end with external input phase
Even；The soft starting circuit includes start-up capacitance, and grid, source electrode of the start-up capacitance both ends respectively with MOSFET pipes V1 are connected；Together
When MOSFET pipes V1 grid, source electrode be connected respectively with the both ends of bleeder circuit, wherein source electrode is connected with connecing external input.
A kind of combination EMI filtering and the circuit of soft start, the bleeder circuit is by the first divider resistance R1 and the second partial pressure
Resistance R2 is in series, wherein the input positive terminal phase of the first divider resistance R1 and external input anode and common mode filtering inductance L1
Even, the second divider resistance R2 with external input is connected；At the same time the grid of MOSFET pipes V1, source electrode respectively with the second divider resistance
The both ends of R2 are connected.
A kind of combination EMI filtering and the circuit of soft start, the soft starting circuit is by the first soft start capacitor C1 and second
Soft start capacitor C2 is in series, the first soft start capacitor C1 and the second soft start capacitor C2 series connection after both ends respectively with MOSFET
Grid, the source electrode of pipe V1 is connected；
A kind of combination EMI filtering and the circuit of soft start, the EMI filter circuit include common mode filtering inductance L1, first
Common mode filtering capacitance C4, the second common mode filtering capacitance C5, differential mode filter inductance L2, differential mode filter capacitor C3；The common mode filtering
Drain electrode of the positive and negative end of input of inductance L1 respectively with MOSFET pipes V1 in external input anode and soft starting circuit is connected, common mode
The positive and negative end of output of filter inductance L1 is connected with differential mode filter inductance L2 one end, output respectively；Differential mode filter inductance L2 windings
Both ends be connected respectively with common mode filter inductance L1 and output plus terminal；The both ends of differential mode filter capacitor C3 respectively with output plus terminal,
Output ground is connected；A termination output plus terminal of first common mode filtering capacitance C4, a termination enclosure, the second common mode filtering capacitance C5's
One termination output ground, a termination enclosure.
The utility model is in soft starting circuit, the first divider resistance R1 and external input anode and common mode filtering inductance
The input positive terminal of L1 is connected, and the second divider resistance R2 with external input is connected.When by the first divider resistance R1 and the second partial pressure
When the both ends for the bleeder circuit that resistance R2 is formed connect with input voltage, the partial pressure and MOSFET that are formed in the junction of R1 and R2
The grid of pipe V1 is connected, the cut-in voltage as MOSFET pipes V1；By the first soft start capacitor C1 and the second soft start capacitor C2
Mutual redundancy is formed after series connection and grid, source electrode of the both ends respectively with MOSFET pipes V1 are connected as soft start capacitor, wherein
Source electrode is connected with connecing external input, and the grid voltage for making MOSFET pipes V1 using the charge effects of capacitance slowly rises, and causes
MOSFET pipes V1 is slowly turned on by cut-off state, so that play the role of suppression power-on surge current, after the completion of soft start-up process,
The voltage of resistance R3 terminations reaches stable state, and MOSFET pipes V1 is in fully on state.The drain electrode of MOSFET pipes V1 and EMI filtering
The input negative terminal of common mode filtering inductance L1 is connected in circuit, and after MOSFET pipes V1 is turned on, then front stage circuit forms path.
The positive and negative end of input of common mode filtering inductance L1 is electric with external input anode and soft start respectively in EMI filter circuit
The drain electrode of MOSFET pipes V1 is connected in road, and a termination output plus terminal of the first common mode filtering capacitance C4, a termination enclosure, second is common
A termination output ground of mould filter capacitor C5, a termination enclosure, two are formed with two windings of common mode filter inductance L1 respectively
LC low-pass filters, to mainly being filtered out in power cord with the common mode EMI noise conducted on shell；And differential mode filter inductance L2 with
The differential mode filter capacitor C3 of bridging on the power line forms LC low-pass filters, to the differential mode EMI mainly conducted on the power line
Noise is filtered out.
In conclusion the utility model beneficial effect：
（1）A kind of combination EMI filtering of the utility model and the circuit of soft start, positioned at the front end of circuitry, its advantage
It is to filter out the EMI noise conducted by power cord from system power supply source, and effectively reduces power-on surge current, most
Big degree reduces the impact to front stage circuit, improves the Performance And Reliability of equipment power supply.
（2）Soft starting circuit in the utility model is realized to start wave using the combination of resistance, capacitance, MOSFET pipes V1
Gush the suppression i.e. soft start function of electric current, the of simple structure and strong practicability of this circuit, reliability height.
Brief description of the drawings
Attached drawing 1 is the electrical block diagram of the utility model specific embodiment.
Embodiment
Below in conjunction with the accompanying drawings the utility model is further illustrated with specific embodiment.
As shown in drawings, the circuit of a kind of combination EMI filtering and soft start, including soft starting circuit and EMI filter circuit；
The soft starting circuit include MOSFET pipes V1, the first divider resistance R1, the second divider resistance R2, the first soft start capacitor C1,
Second soft start capacitor C2 is formed.
The input negative terminal of common mode filtering inductance L1 in the drain electrode of MOSFET pipes V1 in soft starting circuit and EMI filter circuit
It is connected；The bleeder circuit being made of the first divider resistance R1 and the second divider resistance R2, wherein the first divider resistance R1 with it is outer
Portion's input positive terminal and the input positive terminal of common mode filtering inductance L1 are connected, and the second divider resistance R2 with external input is connected；The
Grid, source electrode of the both ends respectively with MOSFET pipes V1 are connected after one soft start capacitor C1 and the second soft start capacitor C2 series connection；Together
When MOSFET pipes V1 both ends respectively with the second divider resistance R2 of grid, source electrode be connected, wherein source electrode with connecing external input phase
Even.Soft starting circuit mainly realizes the suppression to power-on surge current.
The EMI filter circuit includes common mode filtering inductance L1, the first common mode filtering capacitance C4, the second common mode filtering capacitance
C5, differential mode filter inductance L2, differential mode filter capacitor C3 are formed.
The positive and negative end of input of common mode filtering inductance L1 respectively with MOSFET pipes V1 in external input anode and soft starting circuit
Drain electrode be connected, the positive and negative end of output of common mode filtering inductance L1 is connected with differential mode filter inductance L2 one end, output respectively；Difference
The both ends of mould filter inductance L2 windings are connected with common mode filter inductance L1 and output plus terminal respectively；The both ends of differential mode filter capacitor C3
It is connected respectively with output plus terminal, output；A termination output plus terminal of first common mode filtering capacitance C4, a termination enclosure, second
A termination output ground of common mode filtering capacitance C5, a termination enclosure.EMI filter circuit mainly realizes the filter to EMI noise interference
Remove.
With reference to EMI filtering and the control method of soft starting circuit, comprise the following steps：
（1）When start input when, by the bleeder circuit that the first divider resistance R1, the second divider resistance R2 are formed by component voltage
Send to the grid of MOSFET pipes V1, the first soft start capacitor C1 in parallel with the second divider resistance R2, the second soft start capacitor C2
Due to charge effects so that the component voltage of the second divider resistance R2 upper ends, that is, MOSFET pipe V1 grid voltages slowly rise, MOSFET
Pipe V1 is also slowly turned on by cut-off state；
（2）After soft start capacitor charges, the component voltage of the second divider resistance R2 upper ends reaches stable state, soft start mistake
Journey is completed, and MOSFET pipes V1 is in fully on state, and front stage circuit forms path, and power-on surge current is in soft start mistake
It is inhibited in journey；
（3）When circuit works in stable state, the LC low passes that are made of common mode filtering inductance L1 and common mode filtering capacitance
Wave filter filters out the common-mode noise conducted between power cord and shell；
（4）When circuit works in stable state, the LC being made of differential mode filter inductance L2 and differential mode filter capacitor C3 is low
Bandpass filter filters out the differential mode noise conducted between power cord.
In soft starting circuit, the input of the first divider resistance R1 and external input anode and common mode filtering inductance L1 are just
End is connected, and the second divider resistance R2 with external input is connected.Formed when by the first divider resistance R1 and the second divider resistance R2
The both ends of bleeder circuit when connecting with input voltage, the partial pressure and the grid of MOSFET pipes V1 that are formed in the junction of R1 and R2
It is connected, the cut-in voltage as MOSFET pipes V1；By being formed after the first soft start capacitor C1 and the second soft start capacitor C2 series connection
Mutual redundancy and both ends are connected as soft start capacitor, wherein source electrode with grid, the source electrode of MOSFET pipes V1 respectively connects outside
Input ground be connected, the grid voltage for making MOSFET pipes V1 using the charge effects of capacitance slowly rises, cause MOSFET pipes V1 by
Cut-off state slowly turns on, so that play the role of suppression power-on surge current, after the completion of soft start-up process, resistance R3 terminations
Voltage reaches stable state, and MOSFET pipes V1 is in fully on state.Common mode is filtered in the drain electrode of MOSFET pipes V1 and EMI filter circuit
The input negative terminal of ripple inductance L1 is connected, and after MOSFET pipes V1 is turned on, then front stage circuit forms path.
The positive and negative end of input of common mode filtering inductance L1 is electric with external input anode and soft start respectively in EMI filter circuit
The drain electrode of MOSFET pipes V1 is connected in road, and a termination output plus terminal of the first common mode filtering capacitance C4, a termination enclosure, second is common
A termination output ground of mould filter capacitor C5, a termination enclosure, two are formed with two windings of common mode filter inductance L1 respectively
LC low-pass filters, to mainly being filtered out in power cord with the common mode EMI noise conducted on shell；And differential mode filter inductance L2 with
The differential mode filter capacitor C3 of bridging on the power line forms LC low-pass filters, to the differential mode EMI mainly conducted on the power line
Noise is filtered out.
Embodiment described above is only that the preferred embodiment of the utility model is described, not to this practicality
New scope is defined, and on the premise of the spirit of the design of the utility model is not departed from, those of ordinary skill in the art are to this
The various modifications and improvement that the technical solution of utility model is made, should all fall into the protection that the utility model claims book determines
In the range of.
Claims (4)
1. a kind of combination EMI filtering and the circuit of soft start, including EMI filter circuit, filter circuit include common mode filtering inductance
L1, it is characterised in that further include at least one soft starting circuit, the soft starting circuit includes MOSFET pipes V1, MOSFET pipe V1
Drain electrode be connected with the input negative terminal of common mode filtering inductance L1 in EMI filter circuit；The soft starting circuit includes partial pressure electricity
Road, bleeder circuit one end are connected with external input anode and the common mode filtering inductance L1 input positive terminals, the other end and outside
Input ground is connected；The soft starting circuit includes start-up capacitance, start-up capacitance both ends grid, the source electrode with MOSFET pipes V1 respectively
It is connected；Grid, the source electrode of MOSFET pipes V1 is connected with the both ends of bleeder circuit respectively at the same time, wherein source electrode with connecing external input phase
Even.
2. a kind of combination EMI filtering according to claim 1 and the circuit of soft start, it is characterised in that：The partial pressure electricity
Route the first divider resistance R1 and the second divider resistance R2 be in series, wherein the first divider resistance R1 and external input anode with
And the input positive terminal of common mode filtering inductance L1 is connected, the second divider resistance R2 with external input is connected；MOSFET pipes V1 at the same time
Both ends respectively with the second divider resistance R2 of grid, source electrode be connected.
3. a kind of combination EMI filtering according to claim 1 and the circuit of soft start, it is characterised in that：Soft starting circuit
In series, the first soft start capacitor C1 and the second soft start capacitor by the first soft start capacitor C1 and the second soft start capacitor C2
Grid, source electrode of the both ends respectively with MOSFET pipes V1 are connected after C2 series connection.
4. a kind of combination EMI filtering according to claim 1 and the circuit of soft start, it is characterised in that：The EMI filtering
Circuit include common mode filtering inductance L1, the first common mode filtering capacitance C4, the second common mode filtering capacitance C5, differential mode filter inductance L2,
Differential mode filter capacitor C3；The positive and negative end of input of the common mode filtering inductance L1 respectively with external input anode and soft starting circuit
The drain electrode of middle MOSFET pipes V1 is connected, the positive and negative end of output of common mode filtering inductance L1 respectively with differential mode filter inductance L2 one end, defeated
It is connected with going out；The both ends of differential mode filter inductance L2 windings are connected with common mode filter inductance L1 and output plus terminal respectively；Differential mode filters
The both ends of capacitance C3 are connected with output plus terminal, output respectively；A termination output plus terminal of first common mode filtering capacitance C4, one end
Connect shell, a termination output ground of the second common mode filtering capacitance C5, a termination enclosure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721138177.3U CN207304373U (en) | 2017-09-06 | 2017-09-06 | A kind of combination EMI filtering and the circuit of soft start |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721138177.3U CN207304373U (en) | 2017-09-06 | 2017-09-06 | A kind of combination EMI filtering and the circuit of soft start |
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| Publication Number | Publication Date |
|---|---|
| CN207304373U true CN207304373U (en) | 2018-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721138177.3U Expired - Fee Related CN207304373U (en) | 2017-09-06 | 2017-09-06 | A kind of combination EMI filtering and the circuit of soft start |
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| Country | Link |
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| CN (1) | CN207304373U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482899A (en) * | 2017-09-06 | 2017-12-15 | 中国电子科技集团公司第四十三研究所 | A kind of combination EMI filtering and the circuit and its control method of soft start |
| CN110808680A (en) * | 2019-11-11 | 2020-02-18 | 南京宏泰半导体科技有限公司 | Direct current EMI filter structure for power adapter |
-
2017
- 2017-09-06 CN CN201721138177.3U patent/CN207304373U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482899A (en) * | 2017-09-06 | 2017-12-15 | 中国电子科技集团公司第四十三研究所 | A kind of combination EMI filtering and the circuit and its control method of soft start |
| CN107482899B (en) * | 2017-09-06 | 2023-10-24 | 中国电子科技集团公司第四十三研究所 | Circuit combining EMI filtering and soft start and control method thereof |
| CN110808680A (en) * | 2019-11-11 | 2020-02-18 | 南京宏泰半导体科技有限公司 | Direct current EMI filter structure for power adapter |
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Granted publication date: 20180501 |