CN106655780B - A kind of isolated electric power conversion apparatus - Google Patents
A kind of isolated electric power conversion apparatus Download PDFInfo
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- CN106655780B CN106655780B CN201610911826.2A CN201610911826A CN106655780B CN 106655780 B CN106655780 B CN 106655780B CN 201610911826 A CN201610911826 A CN 201610911826A CN 106655780 B CN106655780 B CN 106655780B
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- circuit
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- flyback
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- power conversion
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- 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
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
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 winding of the primary side switch circuit, circuit of reversed excitation and the isolating transformer is connected, 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, and the Same Name of Ends of the flyback winding is identical as the Same Name of Ends of the primary side winding.The circuit of reversed excitation realizes the magnetic reset of forward conversion circuit, has the advantages that efficient, circuit is simple, so that the isolated electric power conversion apparatus power density large volume is small.
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, primary side diode DZConducting, is stored in encouraging in transformer T
Magnetic energy returns to power supply Vin, realizes that magnetic core resets.The voltage V at switching tube Q drain-source both endsDS=Vin(1+N1/N3), practical application
In in order to reduce switching tube Q voltage stress, while improving duty ratio, generally make N3=N1, at this time VDS=Vin.In addition, to make
It is equal with set Flux consumption to reset Flux consumption, guarantees that magnetic core resets successfully, the duty ratio D of switching tube Q cannot be greater than 50%, design
When generally choose Dmax=0.4.Using the forward converter feature of reset winding: advantage is that transformer configuration is relatively easy, magnetization
Energy lossless can be fed back in input source；The disadvantage is that switch tube voltage stress is higher, generally the 2 of input voltage times.Switch
Pipe can generate biggish electric current and due to voltage spikes when opening, turning off, and 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, which is characterized in that the flyback electricity
Road includes a flyback winding and a storage capacitor, and the flyback winding and the storage capacitor are in parallel, the flyback winding it is same
Name end is identical as 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.
Isolated electric power conversion apparatus of the invention passes through the primary side winding series connection one inverse-excitation converting electricity in forward converter
Road, the winding of flyback converter circuit is when forward converter transmits electric energy to secondary side, charging；Stop in forward converter to pair
When electric energy is transmitted on side, the winding of flyback converter circuit is stored the magnetization energy of transformer to capacitor with this to capacitor charging
In.The technical solution topological structure is simple, and the voltage stress that main switch is born is small, and the adjustable range of duty ratio is big.
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.
The waveform diagram of key point when Fig. 4 is continuous input current in Fig. 3.
Fig. 5 is the waveform diagram of key point when input current is interrupted in Fig. 3.
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 Same Name of Ends of the flyback winding N3 is identical as the Same Name of Ends of the primary side winding N1.When switch Q is opened, flyback around
Group N3 energy storage, storage capacitor C discharges electric energy, and when switch Q is turned off, flyback winding N3 into storage capacitor C, realizes electric energy transfer
Magnetic reset.In the present embodiment, the circuit of reversed excitation 22 further includes that diode a D1, the diode D1 makes the flyback winding N3
In electric current one-way flow, guarantee that the electric energy in the storage capacitor C can not be stored into flyback winding N3.Preferably, institute
State a part that flyback winding N3 is 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.
Fig. 5 is the waveform diagram that the primary current of isolated electric power conversion apparatus shown in Fig. 3 works in continuous mode:
Resonant process t0~t1: master switch Q is open-minded, and primary side winding N1 forward direction excitation, flyback winding N3 energy storage, secondary side is just
Swash circuit conducting, resonant inductance Lr and resonant capacitance Cr resonance；T1 moment secondary current resonance is to zero, due to the work of diode Dr
With conduct reverse current is unable to, 3111 resonance of resonance circuit terminates.
Linear process t1~t2: master switch Q continues open-minded, and primary side winding N1 continues positive excitation, flyback winding N3 after
Continuous energy storage, until master switch Q is turned off；Secondary side resonance circuit 3111 and filter circuit 3112 disconnect, resonant inductance Lr electric current and
Voltage becomes 0, and resonant capacitance Cr discharges to load linearity.
Linear process t2~t3: master switch Q shutdown, flyback circuit 32 are connected, transformer magnetic reset；Secondary side resonant capacitance
Cr continues to discharge, until next cycle master switch Q open-minded.
Fig. 4 is the waveform diagram that the primary current of isolated electric power conversion apparatus shown in Fig. 3 works in discontinuous mode:
Resonant process t0~t1: master switch Q is open-minded, and primary side winding N1 forward direction excitation, flyback winding N3 energy storage, secondary side is just
Swash circuit conducting, to load transmission energy, resonant inductance Lr and resonant capacitance Cr resonance；T1 moment secondary current resonance to zero,
Since the effect of diode Dr is unable to conduct reverse current, resonance terminates.
Linear process t1~t2: master switch Q continues open-minded, and primary side winding N1 continues positive excitation, flyback winding N3 after
Continuous energy storage, until master switch Q is turned off；Secondary side normal shock circuit disconnects, and resonant inductance Lr electric current and voltage become 0, resonance electricity
Hold Cr to discharge to load linearity.
Linear process t2~t3: master switch Q shutdown, flyback circuit 32 are connected, transformer T magnetic reset；Secondary side resonance electricity
Hold Cr to continue to discharge.
Linear process t3~t4: master switch Q continues to turn off, and transformer T magnetic reset terminates, electric current to zero；Secondary side resonance
Capacitor Cr continues to discharge, until master switch Q next cycle is open-minded.
In conclusion the embodiment of the present invention proposes a kind of isolated electric power conversion apparatus, there is magnetic reset circuit, efficiency
Height, circuit structure is simple, and the duty ratio highest of switching tube Q can achieve 0.9 or more.
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 of the master switch, 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, which is characterized in that the flyback electricity
Road includes a flyback winding and a storage capacitor, and the flyback winding and the storage capacitor are in parallel, the flyback winding it is same
Name end is identical as the Same Name of Ends of the primary side winding.
2. a kind of isolated 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 isolated 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 isolated 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 isolated 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 isolated 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 isolated electric power conversion apparatus as claimed in claim 4, which is characterized in that 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 |
|---|---|---|---|
| CN201610911826.2A CN106655780B (en) | 2016-10-19 | 2016-10-19 | A kind of isolated electric power conversion apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610911826.2A CN106655780B (en) | 2016-10-19 | 2016-10-19 | A kind of isolated electric power conversion apparatus |
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| CN106655780A CN106655780A (en) | 2017-05-10 |
| CN106655780B true CN106655780B (en) | 2019-05-03 |
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| CN201610911826.2A Active CN106655780B (en) | 2016-10-19 | 2016-10-19 | A kind of isolated electric power conversion apparatus |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109391153A (en) * | 2017-08-11 | 2019-02-26 | 南京博兰得电子科技有限公司 | A kind of isolated electric power conversion apparatus |
| CN109980942A (en) * | 2019-03-25 | 2019-07-05 | 华中科技大学 | A kind of DC-DC converter based on segmented transformer |
| CN114123799B (en) * | 2021-11-26 | 2023-10-10 | 珠海格力电器股份有限公司 | Isolation switch power supply circuit, control method and isolation switch power supply |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09275681A (en) * | 1996-04-04 | 1997-10-21 | Nec Eng Ltd | Forward converter |
| US6081432A (en) * | 1998-05-26 | 2000-06-27 | Artesyn Technologies, Inc. | Active reset forward converter employing synchronous rectifiers |
| CN1545195A (en) * | 2003-11-19 | 2004-11-10 | 南京航空航天大学 | Positive and negative excitation bidirectional DC-DC converter |
| CN101686015B (en) * | 2008-09-23 | 2011-12-28 | 台达电子工业股份有限公司 | forward-flyback converter with active clamping circuit |
| CN104981971A (en) * | 2013-02-28 | 2015-10-14 | 瑞典爱立信有限公司 | Forward-flyback topology switched mode power supply |
| CN105915061A (en) * | 2016-05-04 | 2016-08-31 | 龙岩学院 | Integration forward-flyback circuit employed by leakage inductance energy |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7924579B2 (en) * | 2008-02-05 | 2011-04-12 | Cisco Technology, Inc. | Fly-forward converter power supply |
-
2016
- 2016-10-19 CN CN201610911826.2A patent/CN106655780B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09275681A (en) * | 1996-04-04 | 1997-10-21 | Nec Eng Ltd | Forward converter |
| US6081432A (en) * | 1998-05-26 | 2000-06-27 | Artesyn Technologies, Inc. | Active reset forward converter employing synchronous rectifiers |
| CN1545195A (en) * | 2003-11-19 | 2004-11-10 | 南京航空航天大学 | Positive and negative excitation bidirectional DC-DC converter |
| CN101686015B (en) * | 2008-09-23 | 2011-12-28 | 台达电子工业股份有限公司 | forward-flyback converter with active clamping circuit |
| CN104981971A (en) * | 2013-02-28 | 2015-10-14 | 瑞典爱立信有限公司 | Forward-flyback topology switched mode power supply |
| CN105915061A (en) * | 2016-05-04 | 2016-08-31 | 龙岩学院 | Integration forward-flyback circuit employed by leakage inductance energy |
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| Publication number | Publication date |
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| CN106655780A (en) | 2017-05-10 |
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Effective date of registration: 20200323 Address after: 213100 No.7 Fengxiang Road, Wujin high tech Development Zone, Changzhou City, Jiangsu Province Patentee after: Chip power (Changzhou) Co., Ltd Address before: Everwise road in Qinhuai District of Nanjing City, Jiangsu province 210001 No. 6 Baixia high-tech park Chinese cloud innovation base A building 12 floor Patentee before: FSP-Powerland Technology Inc. |