CN106533182A - Isolation circuit and switching power supply - Google Patents
Isolation circuit and switching power supply Download PDFInfo
- Publication number
- CN106533182A CN106533182A CN201611092917.4A CN201611092917A CN106533182A CN 106533182 A CN106533182 A CN 106533182A CN 201611092917 A CN201611092917 A CN 201611092917A CN 106533182 A CN106533182 A CN 106533182A
- Authority
- CN
- China
- Prior art keywords
- common mode
- isolation circuit
- mode inductance
- output end
- inductance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
Abstract
The invention relates to an isolation circuit and a switching power supply. The isolation circuit is connected to the output end of a direct current power supply; the isolation circuit comprises a direct current power supply conversion module and a common-mode inductor module; by setting a voltage reduction unit and a first inductor of the direct current power supply conversion module, a first direct current signal after voltage reduction can be output; by connecting the first inductor with a common-mode inductor and a rectifying unit which is connected with the first output end of the common-mode inductor in parallel, a second direct current signal isolated from the first direct current signal can be output by electromagnetic conversion between two paths of the common-mode inductor, so as to realize isolation and insulation of two paths of power supplies; by connecting the output end of the direct current power supply with the isolation circuit in series, the number of windings on a high-frequency transformer can be reduced, and passing rate of electromagnetic radiation interference resistance also can be improved, thereby enabling product design to be more convenient, flexible and reliable.
Description
Technical field
The present invention relates to power circuit technical field, more particularly to isolation circuit and Switching Power Supply.
Background technology
Jing is widely used in electronic product Switching Power Supply, and it is with efficiency high, small volume, lightweight, 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
Insulating power supply powering to internal circuit, carry out electricity typically by the mode of the high frequency transformer winding in Switching Power Supply
The management distribution in source.
But realize that insulating power supply can be subject to the shadow of the factor such as product structure, volume, PCB layouts by high frequency transformer
Ring.As high frequency transformer pin number is by limited time, which to be reached the quantity of insulating power supply, generally requires in high frequency transformer
On carry out fly line, the design of its fly line can to the Electro Magnetic Compatibility of product (Electro Magnetic Compatibility,
EMC) design and produce certain impact with electromagnetic interference (Electromagnetic Interference, EMI), it is such as too long of
Fly line can make the electromagnetic interference (EMI) emissions of product harass increase, or even can exceed electronic product EMI regulations scope, affect to produce
The performance of product.
The content of the invention
Based on this, it is necessary to for the problems referred to above, there is provided one kind can reduce high frequency transformer winding quantity, 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 source, including：
Dc source modular converter, including voltage drop unit and the first inductance, it is the Switching Power Supply, voltage drop unit, first electric
Sense is sequentially connected electrically, for being depressured the d. c. voltage signal that the dc source is exported and exporting the first direct current signal；
Common mode inductance module, for exporting the second direct current signal isolated with first direct current signal；The common mode electricity
Sense module includes the common mode inductance and rectification unit, the first input end of the common mode inductance and first inductance for isolation
First end connection, the second input of the common mode inductance is connected with the second end of first inductance；The common mode inductance
The first output end Jing described in rectification unit with load be connected, the second output head grounding of the common mode inductance.
Above-mentioned isolation circuit, is connected to the output end of dc source, by the pressure drop list for arranging dc source modular converter
Unit and the first inductance, the first direct current signal after exportable step-down.By the 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, so as to reach the purpose of two-way isolated from power insulation.By the output end string of dc source
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, so that product design is more convenient and flexible, reliable.
Wherein in one embodiment, the voltage drop unit is DC-DC pressure drop chips.
Wherein in one embodiment, the dc source modular converter also includes the first diode, the one or two pole
The negative electrode of pipe is connected with the first end of the voltage drop unit, the first inductance respectively, the plus earth of first diode.
Wherein in one embodiment, first diode is fly-wheel diode.
Wherein in one embodiment, the rectification unit is commutation diode, the anode of the commutation diode and institute
The first output end connection of common mode inductance is stated, the negative electrode of the commutation diode is connected with load.
Wherein in one embodiment, the common mode inductance module also includes electrochemical capacitor, the positive pole of the electrochemical capacitor
It is connected with the negative electrode of the commutation diode；The negative pole of the electrochemical capacitor is connected with the second output end of the common mode inductance.
Wherein in one embodiment, the common mode inductance module also includes Zener diode, the Zener diode
Negative electrode negative electrode respectively with the commutation diode, the positive pole of electrochemical capacitor are connected, the anode of the Zener diode with it is described
The second output end connection of common mode inductance.
Wherein in one embodiment, the common mode inductance module also includes filter capacitor, and the filter capacitor is serially connected in
Between first output end and the second output end of the common mode inductance.
Additionally, also provide a kind of Switching Power Supply, including dc source, high frequency transformer, the DC power supply with it is described
High frequency transformer connects, and also including above-mentioned isolation circuit, the isolation circuit is at least defeated all the way with the high frequency transformer
Go out end connection.
Description of the drawings
Fig. 1 is the circuit frame figure of isolation circuit in an embodiment；
Fig. 2 is the circuit theory diagrams of isolation circuit in an embodiment；
Fig. 3 is the frame diagram of an embodiment breaker in middle power supply.
Specific embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give presently preferred embodiments of the present invention.But, the present invention can be realized in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, the purpose for providing these embodiments is to make the understanding to the disclosure more thorough
Comprehensively.
Unless otherwise defined, all of technology used herein and scientific terminology and the technical field for belonging to the present invention
The implication that technical staff is generally understood that is identical.The term for being used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that limit the present invention.Term as used herein "and/or" includes that one or more are related
Listed Items arbitrary and all of combination.
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 source, including dc source modular converter 110 and common mode inductance module
120.Wherein, dc source modular converter 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 is straight with first for exporting
Second direct current signal of stream 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 connected with the first end of the first inductance L1, the second input (2) and first inductance of common mode inductance L2
The second end connection of L1；The rectified unit of first output end of common mode inductance L2 121 be connected with load, you can export the second direct current
Signal.
By the 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 with first output end of common mode inductance L2 connection rectification unit 121 be it is exportable isolate with the first direct current signal second
Direct current signal, so as to reach the purpose of two-way direct current signal isolated insulation.By above-mentioned isolation circuit is serially connected in dc source
Output end, it is possible to reduce the winding quantity on high frequency transformer, the jamproof percent of pass of electromagnetic radiation can also be improved, from
And make 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 inputs
Pin) it is connected with the output end of dc source, receive and carry out 12V d. c. voltage signals, the conversion of Jing DC-DC pressure drop chip U1 passes through
One output end (CB pins) exports 5.7V d. c. voltage signals.
First inductance L1 is connected with the output end (CB pins) of DC-DC pressure drop chip U1, when the certain frequency of conversion chip output
When rate and discontinuous electric current, the electric current of input, output end according to inductance will not produce mutation, even if, when conversion chip is dashed forward
So disconnect, the electric current in its inductance still then proceedes to output, you can persistently export 5.7V d. c. voltage signals, namely the first direct current
Signal.
In one embodiment, dc source modular converter 110 also includes the first diode D1, the negative electrode of the first diode D1
It is connected with the first end of voltage drop unit 111 (SW pins), the first inductance L1 respectively, the plus earth of the first diode D1.First
Diode D1 is fly-wheel diode, can select Schottky diode or fast recovery diode.When the electric current of load occurs
During mutation, fly-wheel diode can play a part of smooth electric current.Fly-wheel diode is arranged near SW pins, to reduce switch point
Peak.What is be connected with the first diode D1 also includes that the functional design of series connection has the first resistor and the 4th electric capacity of anti-noise, its
First diode D1, first resistor, the 4th electric capacity constitute freewheeling circuit.
Rectification unit 121 in common mode inductance L2 be commutation diode D2, the anode and common mode inductance of commutation diode D2
The first output end connection of L2, the negative electrode of commutation diode D2 are connected with load.Entered using the one-way conduction characteristic of diode
Row rectification, makes the alternating current of common mode inductance L2 outputs be converted to direct current.
Common mode inductance L2 modules 120 also include electrochemical capacitor C1, the positive pole of electrochemical capacitor C1 and the moon of commutation diode D2
Pole connects；The minus earth of electrochemical capacitor C1.
First input end (1), the second input (2) and first on the left of common mode inductance L2 in common mode inductance L2 modules 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, after the rectified diode D2 rectifications of inductance on right side, you can produce the second direct current signal and exported by the first output end.Its
In, the sense of current is consistent with Same Name of Ends, and the energy stores in inductance realize the converted of a cycle in electrochemical capacitor C1
Journey.Using the isolation characteristic of common mode inductance L2, a kind of exportable the second direct current signal isolated with the first direct current signal is realized
The purpose of the dc source of output isolation.
Common mode inductance L2 modules 120 also include Zener diode D3, the negative electrode of Zener diode D3 respectively with two pole of rectification
The negative electrode of pipe D2, the positive pole connection of electrochemical capacitor C1, the plus earth of Zener diode D3.Zener diode D3 is called Zener two
Pole pipe, its electric current can change in very large range and voltage is basically unchanged, and play pressure stabilization function.
It is first defeated that common mode inductance L2 modules 120 also include that filter capacitor C2, filter capacitor C2 are serially connected in common mode inductance L2
Go out between end and the second output end.The filtered electric capacity C2 of its second direct current signal is exported to load after filtering spurious frequency signal.
A kind of Switching Power Supply, including dc source 20, high frequency transformer 30, dc source 20 are connected with high frequency transformer 30
Connect, also including above-mentioned isolation circuit 10, isolation circuit 10 and high frequency transformer 30 at least output end is connected all the way.By 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, so that product design is more convenient and flexible, reliable.
Each technical characteristic of embodiment described above arbitrarily can be combined, to make description succinct, not to above-mentioned reality
Apply 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, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more concrete and detailed, but and
Therefore can not be construed as limiting the scope of the patent.It should be pointed out that for one of ordinary skill in the art comes
Say, without departing from the inventive concept of the premise, some deformations and improvement can also be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (9)
1. a kind of isolation circuit, is connected to the output end of dc source, it is characterised in that include：
Dc source modular converter, including voltage drop unit and the first inductance, the Switching Power Supply, voltage drop unit, the first inductance according to
Secondary electrical connection, for being depressured the d. c. voltage signal that the dc source is exported and exporting the first direct current signal；
Common mode inductance module, for exporting the second direct current signal isolated with first direct current signal；The common mode inductance mould
Block includes the common mode inductance and rectification unit for isolation, the of the first input end of the common mode inductance and first inductance
One end connects, and the second input of the common mode inductance is connected with the second end of first inductance；The of the common mode inductance
Rectification unit described in one output end Jing is connected with load, the second output head grounding of the common mode inductance.
2. isolation circuit according to claim 1, it is characterised in that the voltage drop unit is DC-DC pressure drop chips.
3. isolation circuit according to claim 1, it is characterised in that the dc source modular converter also includes the one or two
Pole pipe, the negative electrode of first diode are connected with the first end of the voltage drop unit, the first inductance respectively, the one or two pole
The plus earth of pipe.
4. isolation circuit according to claim 3, it is characterised in that first diode is fly-wheel diode.
5. isolation circuit according to claim 1, it is characterised in that the rectification unit is commutation diode, described whole
The anode of stream diode is connected with the first output end of the common mode inductance, and the negative electrode of the commutation diode is connected with load.
6. isolation circuit according to claim 5, it is characterised in that the common mode inductance module also includes electrochemical capacitor,
The positive pole of the electrochemical capacitor is connected with the negative electrode of the commutation diode；The negative pole of the electrochemical capacitor and the common mode inductance
The second output end connection.
7. isolation circuit according to claim 6, it is characterised in that the common mode inductance module also includes two pole of voltage stabilizing
Pipe, the negative electrode of Zener diode negative electrode respectively with the commutation diode, the positive pole of electrochemical capacitor are connected, the voltage stabilizing
The anode of diode is connected with the second output end of the common mode inductance.
8. isolation circuit according to claim 1, it is characterised in that the common mode inductance module also includes filter capacitor,
The filter capacitor is serially connected between the first output end of the common mode inductance and the second output end.
9. a kind of Switching Power Supply, including dc source, high frequency transformer, the DC power supply are connected with the high frequency transformer
Connect, it is characterised in that also include the isolation circuit as described in any one of claim 1～8, 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106533182A true CN106533182A (en) | 2017-03-22 |
| CN106533182B 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108886339A (en) * | 2018-04-13 | 2018-11-23 | 苏州谐通光伏科技股份有限公司 | Photovoltaic module array cutoff device |
| 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 |
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 |
Cited By (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 |
| CN108886339A (en) * | 2018-04-13 | 2018-11-23 | 苏州谐通光伏科技股份有限公司 | Photovoltaic module array cutoff device |
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| Publication number | Publication date |
|---|---|
| CN106533182B (en) | 2018-11-20 |
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