CN109391153A - A kind of isolated electric power conversion apparatus - Google Patents
A kind of isolated electric power conversion apparatus Download PDFInfo
- Publication number
- CN109391153A CN109391153A CN201710685469.7A CN201710685469A CN109391153A CN 109391153 A CN109391153 A CN 109391153A CN 201710685469 A CN201710685469 A CN 201710685469A CN 109391153 A CN109391153 A CN 109391153A
- Authority
- CN
- China
- Prior art keywords
- circuit
- winding
- flyback
- electric power
- power conversion
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
Abstract
A kind of isolated electric power conversion apparatus, including forward conversion circuit and circuit of reversed excitation, the forward conversion circuit includes primary side switch circuit, isolating transformer and secondary side output circuit, the primary side switch circuit, the series connection of the primary side winding of circuit of reversed excitation and the isolating transformer, the vice-side winding of the pair side output circuit and the isolating transformer is in parallel, it is characterized in that, the circuit of reversed excitation includes a flyback winding and a storage capacitor, the flyback winding and the storage capacitor are in parallel, the flyback winding and primary side winding series connection, and the Same Name of Ends of the flyback winding is opposite with the Same Name of Ends of the primary side winding.
Description
Technical field
The invention relates to isolated power conversion technologies, in particular to forward power converting means.
Background technique
Transformer magnetic reset problem is problem specific to forward converter, transformer needed during switching tube turns off into
Row magnetic reset, to guarantee that magnetic flux returns to initial value when each switch periods start, to avoid due to magnetic flux constantly rises
Magnetic core of transformer is caused to be saturated.For converter magnetic reset problem, a variety of solutions, existing typical case have been proposed at present
Forward converter magnetic reset technique includes: (a) using reset winding mode；(b) RCD reset mode；(c) active-clamp reset side
Formula；(d) resonant reset mode；(e) diode configuration magnetic reset lane-wise is used.
Wherein reset winding mode typically uses reset winding to carry out the forward converter circuit of transformer magnetic reset such as
Shown in Fig. 1, in order to make transformer T magnetic reset, a reset winding N3, Same Name of Ends and primary side winding are added in transformer T
N1 is opposite.When switching tube Q shutdown, transformer T different name end is positive, and primary side diode DZ conducting is stored in encouraging in transformer T
Magnetic energy returns to power supply Vin, realizes that magnetic core resets.The voltage at switching tube Q drain-source both ends reduces switching tube in practical application
Q voltage stress, while duty ratio is improved, generally make N3=N1, at this time.In addition, to make to reset Flux consumption and set Flux consumption
It is equal, guarantee that magnetic core resets successfully, the duty ratio D of switching tube Q cannot be greater than 50%, and when design is generally chosen.Using reset around
The forward converter feature of group: advantage is that transformer configuration is relatively easy, and magnetic energy lossless can be fed back in input source；It lacks
Point is that switch tube voltage stress is higher, generally the 2 of input voltage times.Switching tube can generate biggish electric current when opening, turning off
And due to voltage spikes, cause EMI problem.
Summary of the invention
The present invention provides a kind of isolated electric power conversion apparatus, can overcome forward converter magnetic reset in known technology
Technical disadvantages make the forward converter have widely application.
Technical solution of the present invention, including forward conversion circuit and circuit of reversed excitation, the forward conversion circuit includes master control
Switch, isolating transformer and secondary side output circuit, the primary side of the primary side switch circuit, circuit of reversed excitation and the isolating transformer
The vice-side winding of windings in series, the pair side output circuit and the isolating transformer is in parallel, and the circuit of reversed excitation includes one anti-
Swash winding and a storage capacitor, the flyback winding and the storage capacitor are in parallel, the flyback winding and the primary side winding
Series connection, the Same Name of Ends of the flyback winding are opposite with the Same Name of Ends of the primary side winding.
In a specific embodiment of the invention, it is preferred that the circuit of reversed excitation further includes a diode, and the diode makes institute
The electric current one-way flow in flyback winding is stated, guarantees that the electric energy in the storage capacitor can not be stored into flyback winding.
In a specific embodiment of the invention, the flyback winding is a part of the primary side winding.
In a specific embodiment of the invention, the pair side output circuit includes a resonance circuit, and the resonance circuit includes
Concatenated resonant inductance and resonant capacitance, and connect with the vice-side winding of the transformer.
In a specific embodiment of the invention, the resonant inductance is integrated in the vice-side winding of the transformer.
In an of the invention specific embodiment, the resonance circuit further includes a concatenated resonant dipole so that electric energy from
The resonant inductance flows to the resonant capacitance.
In an of the invention specific embodiment, pair side output circuit further includes a filter circuit, the filter circuit and
The resonant capacitance is in parallel, and the filter circuit includes concatenated filter inductance and filter capacitor, the both ends of the filter capacitor
For output end.
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and cooperate institute's accompanying drawings
It is described in detail below.
Detailed description of the invention
Fig. 1 be known technology in a forward converter circuit diagram.
Fig. 2 is the block diagram of the embodiment of the present invention.
Fig. 3 is a specific embodiment of the invention.
Specific embodiment
The embodiment of the present invention provides a kind of isolated electric power conversion apparatus, is known technology the magnetic reset of middle forward converter
Problem provides a kind of preferred solution, realizes efficient lossless reset, and has widened main in forward converter
The duty ratio of power switch tube.In order to be illustrated that the content of this exposure more easily, spy is for embodiment as this hair below
The bright example that can actually implement accordingly.In addition, all possible places, use the group of identical label in schema and embodiment
Part/component/step is to represent same or like component.
Fig. 2 is one embodiment of the invention, and in the embodiment, the isolated electric power conversion apparatus includes forward conversion electricity
Road 21 and circuit of reversed excitation 22, the forward conversion circuit include master switch Q, isolating transformer T and secondary side output circuit 211,
The primary side winding N1 of the master switch Q, circuit of reversed excitation 22 and the isolating transformer T connect, and series connection is followed by by input power
Vin.When master switch Q is opened, forward converter 21 works, and transmits power to output end；When master switch Q is turned off, circuit of reversed excitation
22 work, realize transformer T magnetic reset.
The vice-side winding N2 of pair side output circuit 211 and the isolating transformer T are in parallel, and provide output voltage
Vo, wherein the circuit of reversed excitation 22 includes a flyback winding N3 and storage capacitor a C, the flyback winding N3 and energy storage electricity
It is in parallel to hold C, the flyback winding N3 and primary side winding N1 series connection, the Same Name of Ends of the flyback winding N3 and the primary side around
The Same Name of Ends of group N1 is opposite.In the present embodiment, the circuit of reversed excitation 22 further includes that diode a D1, the diode D1 makes described
Electric current one-way flow in flyback winding N3 guarantees that the electric energy in the storage capacitor C can not be stored into flyback winding N3.
Preferably, the flyback winding N3 is a part of the primary side winding N1.
Fig. 3 is secondary one preferred embodiment of side processing circuit of the present invention, but the present invention is not limited thereto, the pair side
Output circuit 311 includes a resonance circuit 3111, and the resonance circuit 3111 includes concatenated resonant inductance Lr and resonant capacitance
Cr, and connect with the vice-side winding N2 of the transformer T.Preferably, resonance circuit 3111 further includes concatenated two pole of resonance
Pipe Dr, so that electric energy flows to the resonant capacitance Cr from the resonant inductance Lr.The resonant inductance Lr can integrate described
In the vice-side winding N2 of transformer T.
Pair side output circuit 311 further includes a filter circuit 3112, the filter circuit 3112 and resonance electricity
It is in parallel to hold Cr, the filter circuit 3112 includes concatenated filter inductance Lf and filter capacitor Cf, and the two of the filter capacitor Cf
End is the output end of output voltage Vo.
Although the present invention has been disclosed by way of example above, it is not intended to limit the present invention., any technical field
Middle tool usually intellectual, without departing from the spirit and scope of the present invention, when can make some changes and embellishment, thus it is of the invention
Protection scope should be defined by the scope of the appended claims.
Claims (7)
1. a kind of isolated electric power conversion apparatus, including forward conversion circuit and circuit of reversed excitation, the forward conversion circuit include
Master switch, isolating transformer and secondary side output circuit, the primary side switch circuit, circuit of reversed excitation and the isolating transformer
The vice-side winding of primary side winding series connection, the pair side output circuit and the isolating transformer is in parallel, which is characterized in that described anti-
Excitation circuit includes a flyback winding and a storage capacitor, and the flyback winding and the storage capacitor are in parallel, the flyback winding
It connects with the primary side winding, the Same Name of Ends of the flyback winding is opposite with the Same Name of Ends of the primary side winding.
2. a kind of isolation is electric power conversion apparatus as described in claim 1, which is characterized in that the circuit of reversed excitation further includes one or two
Pole pipe, the diode and the flyback windings in series, the diode make the electric current one-way flow in the flyback winding, protect
Demonstrate,proving the electric energy in the storage capacitor can not store into flyback winding.
3. a kind of isolation is electric power conversion apparatus as described in claim 1, which is characterized in that the flyback winding is the primary side
A part of winding.
4. a kind of isolation is electric power conversion apparatus as described in claim 1, which is characterized in that the pair side output circuit includes one
Resonance circuit, the resonance circuit include concatenated resonant inductance and resonant capacitance, and the vice-side winding string with the transformer
Connection.
5. a kind of isolation is electric power conversion apparatus as claimed in claim 4, which is characterized in that the resonant inductance is integrated in described
In the vice-side winding of transformer.
6. a kind of isolation is electric power conversion apparatus as claimed in claim 4, which is characterized in that the resonance circuit further includes a string
The resonant dipole of connection, so that electric energy flows to the resonant capacitance from the resonant inductance.
7. a kind of isolation is electric power conversion apparatus as claimed in claim 4, which is characterized in that the pair side output circuit further includes
One filter circuit, the filter circuit and the resonant capacitance are in parallel, and the filter circuit includes concatenated filter inductance and filter
Wave capacitor, the both ends of the filter capacitor are output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710685469.7A CN109391153A (en) | 2017-08-11 | 2017-08-11 | A kind of isolated electric power conversion apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710685469.7A CN109391153A (en) | 2017-08-11 | 2017-08-11 | A kind of isolated electric power conversion apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109391153A true CN109391153A (en) | 2019-02-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710685469.7A Pending CN109391153A (en) | 2017-08-11 | 2017-08-11 | A kind of isolated electric power conversion apparatus |
Country Status (1)
| Country | Link |
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| CN (1) | CN109391153A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110425174A (en) * | 2019-07-24 | 2019-11-08 | 许继电源有限公司 | Fan speed regulating circuit, multi-channel parallel fan speed regulating circuit |
| TWI826228B (en) * | 2022-11-01 | 2023-12-11 | 大陸商昂寶電子（上海）有限公司 | Circuit for asymmetric half-bridge flyback power supply |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050270810A1 (en) * | 2004-06-07 | 2005-12-08 | Odell Arthur B | Method and apparatus for extending the operating range of a flyforward converter |
| CN101771353A (en) * | 2010-02-24 | 2010-07-07 | 英飞特电子（杭州）有限公司 | Auxiliary source circuit for switch power supply |
| CN203722477U (en) * | 2014-02-19 | 2014-07-16 | 中国电子科技集团公司第四十三研究所 | New type switch power circuit topology structure |
| CN106655780A (en) * | 2016-10-19 | 2017-05-10 | 南京博兰得电子科技有限公司 | Isolated power transformation device |
-
2017
- 2017-08-11 CN CN201710685469.7A patent/CN109391153A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050270810A1 (en) * | 2004-06-07 | 2005-12-08 | Odell Arthur B | Method and apparatus for extending the operating range of a flyforward converter |
| CN101771353A (en) * | 2010-02-24 | 2010-07-07 | 英飞特电子（杭州）有限公司 | Auxiliary source circuit for switch power supply |
| CN203722477U (en) * | 2014-02-19 | 2014-07-16 | 中国电子科技集团公司第四十三研究所 | New type switch power circuit topology structure |
| CN106655780A (en) * | 2016-10-19 | 2017-05-10 | 南京博兰得电子科技有限公司 | Isolated power transformation device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110425174A (en) * | 2019-07-24 | 2019-11-08 | 许继电源有限公司 | Fan speed regulating circuit, multi-channel parallel fan speed regulating circuit |
| TWI826228B (en) * | 2022-11-01 | 2023-12-11 | 大陸商昂寶電子（上海）有限公司 | Circuit for asymmetric half-bridge flyback power supply |
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Application publication date: 20190226 |