CN106533182B - Isolation circuit and Switching Power Supply - Google Patents
Isolation circuit and Switching Power Supply Download PDFInfo
- Publication number
- CN106533182B CN106533182B CN201611092917.4A CN201611092917A CN106533182B CN 106533182 B CN106533182 B CN 106533182B CN 201611092917 A CN201611092917 A CN 201611092917A CN 106533182 B CN106533182 B CN 106533182B
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- China
- Prior art keywords
- common mode
- mode inductance
- power supply
- inductance
- isolation circuit
- Prior art date
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- 238000002955 isolation Methods 0.000 title claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims description 22
- 230000000087 stabilizing effect Effects 0.000 claims 2
- 238000004804 winding Methods 0.000 abstract description 6
- 230000005670 electromagnetic radiation Effects 0.000 abstract description 4
- 230000006837 decompression Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to a kind of isolation circuit and Switching Power Supplies.Isolation circuit is connected to the output end of DC power supply, including DC power supply conversion module and common mode inductance module.The first direct current signal by the way that the voltage drop unit and the first inductance of DC power supply conversion module is arranged, after exportable decompression.Pass through common mode inductance in parallel on the first inductance and the rectification unit connecting with the first output end of common mode inductance, using exportable the second direct current signal being isolated with the first direct current signal of the electromagnetic conversion between common mode inductance two-way, to achieve the purpose that two-way isolated from power insulate.Above-mentioned isolation circuit is concatenated by the output end of DC power supply, it is possible to reduce the winding quantity on high frequency transformer can also improve the jamproof percent of pass of electromagnetic radiation, to keep product design more convenient and flexible, reliable.
Description
Technical field
The present invention relates to power circuit technical fields, more particularly to isolation circuit and Switching Power Supply.
Background technique
Switching Power Supply is through being widely used in electronic product, it is with high-efficient, small in size, light-weight, low in energy consumption
The features such as be widely used in electronic product power source.But due to the differentiation of various product, generally require two groups or more
Isolated power supply come give internal circuit power supply, carry out electricity usually by way of the high frequency transformer winding in Switching Power Supply
The management in source distributes.
But it will receive the shadow of the factors such as product structure, volume, PCB layout by the realization isolated power supply of high frequency transformer
It rings.Since high frequency transformer pin number is by limited time, to reach the quantity of isolated power supply, generally require in high frequency transformer
Upper carry out fly line, fly line design can to product Electro Magnetic Compatibility (Electro Magnetic Compatibility,
EMC) and electromagnetic interference (Electromagnetic Interference, EMI) design generates certain influence, such as too long of
Fly line can make the electromagnetic interference (EMI) emissions of product harass increase, or even can be more than electronic product EMI regulations range, influence to produce
The performance of product.
Summary of the invention
Based on this, it is necessary in view of the above-mentioned problems, high frequency transformer winding quantity can be reduced by providing one kind, and improve electricity
The isolation circuit and Switching Power Supply of magnetic radiation anti-interference.
A kind of isolation circuit is connected to the output end of DC power supply, including：
DC power supply conversion module, including voltage drop unit and the first inductance, the Switching Power Supply, voltage drop unit, the first electricity
Sense is sequentially connected electrically, and the d. c. voltage signal for exporting the DC power supply is depressured and exports the first direct current signal；
Common mode inductance module, for exporting the second direct current signal being isolated with first direct current signal；The common mode electricity
Sense module includes the common mode inductance and rectification unit for isolation, the first input end of the common mode inductance and first inductance
First end connection, the second input terminal of the common mode inductance connect with the second end of first inductance；The common mode inductance
The first output end connected through the rectification unit and load, the second output terminal of common mode inductance ground connection.
Above-mentioned isolation circuit is connected to the output end of DC power supply, by the pressure drop list that DC power supply conversion module is arranged
Member and the first inductance, the first direct current signal after exportable decompression.By common mode inductance in parallel on the first inductance and together
The rectification unit of the first output end of mould inductance connection, it is exportable with the first direct current using the electromagnetic conversion between common mode inductance two-way
Second direct current signal of signal isolation, to achieve the purpose that two-way isolated from power insulate.Pass through the output end string of DC power supply
Connect above-mentioned isolation circuit, it is possible to reduce the winding quantity on high frequency transformer can also improve that electromagnetic radiation is jamproof to be passed through
Rate, to keep product design more convenient and flexible, reliable.
The voltage drop unit is DC-DC pressure drop chip in one of the embodiments,.
The DC power supply conversion module further includes first diode in one of the embodiments, the one or two pole
The cathode of pipe is connect with the first end of the voltage drop unit, the first inductance respectively, the plus earth of the first diode.
The first diode is freewheeling diode in one of the embodiments,.
The rectification unit is rectifier diode, the anode of the rectifier diode and institute in one of the embodiments,
The first output end connection of common mode inductance is stated, the cathode of the rectifier diode and load connect.
The common mode inductance module further includes electrolytic capacitor in one of the embodiments, the anode of the electrolytic capacitor
It is connect with the cathode of the rectifier diode；The cathode of the electrolytic capacitor is connect with the second output terminal of the common mode inductance.
The common mode inductance module further includes zener diode in one of the embodiments, the zener diode
Cathode respectively with the cathode of the rectifier diode, electrolytic capacitor anode connect, the anode of the zener diode with it is described
The second output terminal of common mode inductance connects.
The common mode inductance module further includes filter capacitor in one of the embodiments, and the filter capacitor is serially connected in
Between the first output end and second output terminal of the common mode inductance.
In addition, also provide a kind of Switching Power Supply, including DC power supply, high frequency transformer, the DC power supply with it is described
High frequency transformer connection, further includes above-mentioned isolation circuit, the isolation circuit is at least defeated all the way with the high frequency transformer
Outlet connection.
Detailed description of the invention
Fig. 1 is the circuit frame figure of isolation circuit in an embodiment；
Fig. 2 is the circuit diagram of isolation circuit in an embodiment；
Fig. 3 is the frame diagram of Switching Power Supply in an embodiment.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give presently preferred embodiments of the present invention.But the invention can be realized in many different forms, however it is not limited to this paper institute
The embodiment of description.On the contrary, purpose of providing these embodiments is keeps the understanding to the disclosure more thorough
Comprehensively.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that the limitation present invention.Term as used herein "and/or" includes one or more related
Listed item any and all combinations.
Fig. 1 is the circuit frame figure of isolation circuit in an embodiment；Fig. 2 is the circuit theory of isolation circuit in an embodiment
Figure.A kind of isolation circuit is connected to the output end of DC power supply, including DC power supply conversion module 110 and common mode inductance module
120.Wherein, DC power supply conversion module 110 includes being sequentially connected electrically voltage drop unit 111 and the first inductance L1, can be by direct current
The d. c. voltage signal of power supply output is depressured and exports the first direct current signal.Common mode inductance module 120, for exporting with first directly
Flow the second direct current signal of signal isolation；Common mode inductance module 120 includes common mode inductance L2 and rectification unit 121, common mode inductance
The first input end (1) of L2 is connect with the first end of the first inductance L1, the second input terminal (2) and the first inductance of common mode inductance L2
The second end of L1 connects；The rectified unit 121 of the first output end of common mode inductance L2 is connected with load, i.e., exportable second direct current
Signal.
By common mode inductance L2 in parallel on the first inductance L1, using the isolation characteristic of the electromagnetic conversion of common mode inductance L2,
And rectification unit 121 i.e. exportable second be isolated with the first direct current signal connected with the first output end of common mode inductance L2
Direct current signal, to achieve the purpose that two-way direct current signal isolated insulation.By the way that above-mentioned isolation circuit is serially connected in DC power supply
Output end, so that it may reduce the winding quantity on high frequency transformer, the jamproof percent of pass of electromagnetic radiation can also be improved, from
And keep product design more convenient and flexible, reliable.
In one embodiment, voltage drop unit 111 is DC-DC pressure drop chip U1.(VIN draws DC-DC pressure drop chip U1 input terminal
Foot) it is connect with the output end of DC power supply, it receives and carrys out 12V DC voltage signal, the conversion through DC-DC pressure drop chip U1 passes through
One output end (CB pin) exports 5.7V d. c. voltage signal.
First inductance L1 is connect with the output end (CB pin) of DC-DC pressure drop chip U1, when conversion chip exports certain frequency
When rate and discontinuous electric current, mutation will not be generated according to the electric current of the input of inductance, output end, even if, when conversion chip is prominent
It so disconnects, the electric current in inductance still then proceedes to export, i.e., sustainable output 5.7V d. c. voltage signal namely the first direct current
Signal.
In one embodiment, DC power supply conversion module 110 further includes first diode D1, the cathode of first diode D1
It is connect respectively with voltage drop unit 111 (SW pin), the first end of the first inductance L1, the plus earth of first diode D1.First
Diode D1 is freewheeling diode, can choose Schottky diode or fast recovery diode.When the electric current of load occurs
When mutation, freewheeling diode can play the role of smooth electric current.Freewheeling diode is arranged close to SW pin, to reduce switch point
Peak.What is be connected with first diode D1 further includes the first resistor and the 4th capacitor that concatenated functional design has anti-noise,
First diode D1, first resistor, the 4th capacitor constitute freewheeling circuit.
Rectification unit 121 in common mode inductance L2 is rectifier diode D2, the anode and common mode inductance of rectifier diode D2
The first output end of L2 connects, and the cathode of rectifier diode D2 and load connect.Using the one-way conduction characteristic of diode come into
Row rectification, the alternating current for exporting common mode inductance L2 are converted to direct current.
Common mode inductance L2 module 120 further includes electrolytic capacitor C1, the yin of the anode and rectifier diode D2 of electrolytic capacitor C1
Pole connection；The cathode of electrolytic capacitor C1 is grounded.
First input end (1), the second input terminal (2) and first on the left of common mode inductance L2 in common mode inductance L2 module 120
Inductance L1 is in parallel, and according to electromagnetic conversion principle, the energy in common mode inductance L2 can pass to the electricity on right side under the influence of a magnetic field
Sense can produce the second direct current signal and exported by the first output end after the rectified diode D2 rectification of the inductance on right side.Its
In, current direction is consistent with Same Name of Ends, and the energy stores in inductance realize the converted of a cycle in electrolytic capacitor C1
Journey.Using the isolation characteristic of common mode inductance L2, a kind of exportable the second direct current signal being isolated with the first direct current signal is realized
Export the purpose of the DC power supply of isolation.
Common mode inductance L2 module 120 further includes zener diode D3, the cathode of zener diode D3 respectively with rectify two poles
The anode connection of the cathode, electrolytic capacitor C1 of pipe D2, the plus earth of zener diode D3.Zener diode D3 is called Zener two
Pole pipe, electric current can change in very large range and voltage is basically unchanged, and play pressure stabilization function.
Common mode inductance L2 module 120 further includes filter capacitor C2, and it is first defeated to be serially connected in common mode inductance L2 by filter capacitor C2
Between outlet and second output terminal.Its second direct current signal is exported after filter capacitor C2 filters out spurious frequency signal to load.
A kind of Switching Power Supply, including DC power supply 20, high frequency transformer 30, DC power supply 20 and high frequency transformer 30 connect
Connect, further include above-mentioned isolation circuit 10, isolation circuit 10 and high frequency transformer 30 at least output end is connect all the way.Pass through direct current
The output end of power supply 20 concatenates above-mentioned isolation circuit 10, it is possible to reduce the winding quantity on high frequency transformer 30 can also improve
The jamproof percent of pass of electromagnetic radiation, to keep product design more convenient and flexible, reliable.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (8)
1. a kind of isolation circuit is connected to the output end of DC power supply, which is characterized in that including：
DC power supply conversion module, including voltage drop unit and the first inductance, Switching Power Supply, voltage drop unit, the first inductance are successively electric
Connection, the d. c. voltage signal for exporting the DC power supply are depressured and export the first direct current signal；
Common mode inductance module, for exporting the second direct current signal being isolated with first direct current signal；The common mode inductance mould
Block includes the common mode inductance and rectification unit for isolation, and the of the first input end of the common mode inductance and first inductance
One end connection, the second input terminal of the common mode inductance are connect with the second end of first inductance；The of the common mode inductance
One output end is connected through the rectification unit and load, the second output terminal ground connection of the common mode inductance；
The DC power supply conversion module further includes first diode, the cathode of the first diode respectively with the pressure drop list
Member, the connection of the first end of the first inductance, the plus earth of the first diode.
2. isolation circuit according to claim 1, which is characterized in that the voltage drop unit is DC-DC pressure drop chip.
3. isolation circuit according to claim 1, which is characterized in that the first diode is freewheeling diode.
4. isolation circuit according to claim 1, which is characterized in that the rectification unit is rectifier diode, described whole
The anode of stream diode is connect with the first output end of the common mode inductance, and the cathode of the rectifier diode and load connect.
5. isolation circuit according to claim 4, which is characterized in that the common mode inductance module further includes electrolytic capacitor,
The anode of the electrolytic capacitor is connect with the cathode of the rectifier diode；The cathode of the electrolytic capacitor and the common mode inductance
Second output terminal connection.
6. isolation circuit according to claim 5, which is characterized in that the common mode inductance module further includes two pole of pressure stabilizing
Pipe, the cathode of the zener diode are connect with the anode of the cathode of the rectifier diode, electrolytic capacitor respectively, the pressure stabilizing
The anode of diode is connect with the second output terminal of the common mode inductance.
7. isolation circuit according to claim 1, which is characterized in that the common mode inductance module further includes filter capacitor,
The filter capacitor is serially connected between the first output end of the common mode inductance and second output terminal.
8. a kind of Switching Power Supply, including DC power supply, high frequency transformer, the DC power supply and the high frequency transformer connect
It connects, which is characterized in that further include isolation circuit as described in any one of claims 1 to 7, the isolation circuit and the high frequency
At least output end connection all the way of transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092917.4A CN106533182B (en) | 2016-11-30 | 2016-11-30 | Isolation circuit and Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092917.4A CN106533182B (en) | 2016-11-30 | 2016-11-30 | Isolation circuit and Switching Power Supply |
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| Publication Number | Publication Date |
|---|---|
| CN106533182A CN106533182A (en) | 2017-03-22 |
| CN106533182B true CN106533182B (en) | 2018-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611092917.4A Active CN106533182B (en) | 2016-11-30 | 2016-11-30 | Isolation circuit and Switching Power Supply |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109075738A (en) * | 2018-02-05 | 2018-12-21 | 苏州谐通光伏科技股份有限公司 | Photovoltaic module array turning off system |
| WO2019196096A1 (en) * | 2018-04-13 | 2019-10-17 | 苏州谐通光伏科技股份有限公司 | Photovoltaic assembly array shutdown apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010028506A (en) * | 1999-09-21 | 2001-04-06 | 김종수 | Noise separation apparatus |
| CN101777836A (en) * | 2009-12-31 | 2010-07-14 | 南京博兰得电子科技有限公司 | Electric energy isolation transmission method and isolation transmission device |
| CN101951159A (en) * | 2010-09-20 | 2011-01-19 | 浙江大学 | Capacitor isolated type multipath constant current output resonant mode DC/DC transformer |
| CN202059331U (en) * | 2011-06-01 | 2011-11-30 | 刘德军 | Voltage reduction type switch power supply made of time base circuit |
-
2016
- 2016-11-30 CN CN201611092917.4A patent/CN106533182B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010028506A (en) * | 1999-09-21 | 2001-04-06 | 김종수 | Noise separation apparatus |
| CN101777836A (en) * | 2009-12-31 | 2010-07-14 | 南京博兰得电子科技有限公司 | Electric energy isolation transmission method and isolation transmission device |
| CN101951159A (en) * | 2010-09-20 | 2011-01-19 | 浙江大学 | Capacitor isolated type multipath constant current output resonant mode DC/DC transformer |
| CN202059331U (en) * | 2011-06-01 | 2011-11-30 | 刘德军 | Voltage reduction type switch power supply made of time base circuit |
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| CN106533182A (en) | 2017-03-22 |
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