CN207706055U - A kind of DC-DC converter - Google Patents
A kind of DC-DC converter Download PDFInfo
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- CN207706055U CN207706055U CN201721917570.2U CN201721917570U CN207706055U CN 207706055 U CN207706055 U CN 207706055U CN 201721917570 U CN201721917570 U CN 201721917570U CN 207706055 U CN207706055 U CN 207706055U
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- arm topological
- inductance
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Abstract
The utility model discloses a kind of DC DC converters, include the second bridge arm topological, third bridge arm topological and the capacitance of inductance, rectification module, the first bridge arm topological and parallel connection, the first bridge arm topological includes concatenated first switch pipe and the 4th switching tube, the second bridge arm topological include concatenated second switch pipe and the 5th switching tube, third bridge arm topological include concatenated third switching tube and the 6th switching tube；Inductance one terminates on first switch pipe and the 4th switching tube series coupled point, on another termination second switch pipe and the 5th switching tube series coupled point；First bridge arm topological and inductance constitute Buck converters, and the second bridge arm topological and inductance constitute Boost, and the second bridge arm topological, third bridge arm topological and rectification module constitute phase-shifted full-bridge converter.The topology is multiplexed inductance and the second bridge arm topological, and realizes multiple input output port, meanwhile, Sofe Switch is realized to each switching tube.
Description
Technical field
The utility model is related to field of switch power, more particularly, to a kind of DC-DC converter.
Background technology
DC-DC converter is to apply very extensive power electronic equipment, it is switched on-off by control, in conjunction with passive
Energy storage device such as inductance, capacitance, to realize the direct current that input dc power is become to another fixed voltage or adjustable voltage,
The indirect conversion of directly transformation and DC-AC-direct current including DC to DC, the former is also referred to as chopper circuit, there is six kinds
Basic chopper circuit:Buck circuit (also referred to as Buck converters), rises boost chopper (also referred to as Boost)
Buck circuit (also referred to as One Buck-Boost converter body), Cuk chopper circuits, Sepic chopper circuits and Zeta chopper circuits, this
The direct DC converter of kind is without transformer isolation, and indirect d. c converter adds exchange ring among DC converter
Section, is usually isolated between input and output with transformer, therefore the DC converter also referred to as with isolation.Current switch electricity
In source, indirect DC converter is the primary structure form applied at present.
At the same time, at commercial Application scene, the DC voltage of multiple voltage levels is usually required that, multi output port
DC-DC converter can accomplish overall compact structure, while can save while meeting the requirement of multivoltage horizontal output
About cost.The utility model obtains a kind of including two output ports based on basic DC converter by rationally designing
DC-DC converter topology.
Utility model content
For the disadvantages described above or Improvement requirement of the prior art, the utility model provides a kind of DC-DC converter, mesh
Be not high enough, not big enough the technical problem of power density that solves existing DC-DC converter efficiency.
To achieve the above object, the utility model provides a kind of DC-DC converter, including：Inductance, rectification module, first
The second bridge arm topological, third bridge arm topological and the capacitance of bridge arm topological and parallel connection, wherein the first bridge arm topological is concatenated first
Switching tube and the 4th switching tube, the second bridge arm topological are concatenated second switch pipe and the 5th switching tube, third bridge arm topological are
Concatenated third switching tube and the 6th switching tube；The cathode of the cathode of first bridge arm topological and the second bridge arm topological connects, inductance
On one termination first switch pipe and the 4th switching tube Coupling point in series, another termination second switch pipe of inductance and the 5th is opened
It closes and manages on Coupling point in series；
Rectification module input terminal one terminates on second switch pipe and second switch pipe Coupling point in series, rectification module
On another termination third switching tube of input terminal and the 6th switching tube Coupling point in series, rectification module is used to turn in alternating current
Turn to direct current；There are phase differences for the control signal of second bridge arm topological and the control signal of third bridge arm topological；
First bridge arm topological and inductance constitute Buck converters, and Buck converters are for carrying out at decompression input voltage
Reason, the second bridge arm topological and inductance constitute Boost, and Boost is used to carry out boosting processing to input voltage, the
Two bridge arm topologicals, third bridge arm topological and rectification module constitute phase-shifted full-bridge converter, and phase-shifted full-bridge converter is used for defeated
Enter voltage and carries out buck or boost processing；DC-DC converter is multiplexed inductance and the second bridge arm topological.
Preferably, direct-flow input end of the both ends of the first bridge arm topological as DC-DC converter, capacitance become as DC-DC
First DC output end of parallel operation, the second DC output end of the output end of rectification module as DC-DC converter.
Preferably, first direct-flow input end of the both ends of the first bridge arm topological as DC-DC converter, the conduct of capacitance both ends
Second direct-flow input end of DC-DC converter, the first DC output end of the output end of rectification module as DC-DC converter.
Preferably, rectification module includes a transformer and two rectifier diodes, and the primary side of transformer is as rectification mould
The input terminal of block, both ends tap one rectifier diode of each series connection on the secondary side of transformer, the other end of two rectifier diodes
It is connected, the first terminal of the output end as rectification module, the output end second of the centre tap of transformer as rectification module
Terminal.
Preferably, it is parallel with diode and capacitance on each switching tube of the first bridge arm topological, makes the first bridge arm topological
Middle switching tube realizes Sofe Switch.
Preferably, further include resonant inductance and capacitance, resonant inductance, primary transformer coil and capacitance are successively
Series arm in series, an end of the series arm are connected to second switch pipe and the coupling in series of the 5th switching tube
Point, the another of the series arm are terminated at third switching tube and the 6th switching tube Coupling point in series, and the second bridge arm is opened up
It flutters on each switching tube with third bridge arm topological and is parallel with diode and capacitance, make the second bridge arm topological and third bridge arm topological
Each switching tube realize Sofe Switch.
Preferably, diode in parallel on switching tube and parasitic components or external device that capacitance is switching tube.
Preferably, DC-DC converter further includes output filter；Output filter includes filter inductance and filter capacitor；
The first terminal of the output end of filter inductance one end and rectification module connects, and the other end is as DC-DC converter
The first terminal of DC output end；
The other end of filter capacitor one end and filter inductance connects, the output end of the filter capacitor other end with rectification module
Second terminal connects, Second terminal of the filter capacitor other end as the DC output end of DC-DC converter.
Preferably, DC-DC converter further includes converter filter capacitor, in parallel with the first bridge arm topological, for steady electricity
Pressure.
In general, it can obtain down the above technical solutions conceived by the present invention are compared with the prior art,
Row advantageous effect：
1, design feature is skilfully used, an inductance L1 and a half-bridge, i.e. second switch pipe (Q2) and the 5th switch have been multiplexed
The second bridge arm topological that pipe (Q5) is connected in series so that converter can be made more compact, reduce cost, meanwhile, it reduces
Switching tube number, under same operating condition, reduce switching loss.
2, each switching tube realizes Sofe Switch, with MOSFET instead of diode in general Buck converters, with reality
Existing synchronous rectification reduces switching loss and on-state loss by soft switch technique and synchronous rectification, to improve transformation
The efficiency of device.
3, by reducing switching loss, raising switching frequency that can be larger subtracts in this way, not only improving output waveform
Small filtering difficulty, can reduce filter volume, in addition, after electric voltage frequency improves, transformer is no longer so easily saturated,
And then the volume of transformer can be reduced.Therefore, the utility model can accomplish higher conversion efficiency, meanwhile, largely
Increase power density.
4, the structure for rationally applying plural serial stage, realizes wider direct current input range, further, it is possible to realize larger times
Several decompressions, is adapted to application demand.
5, multiple input output port may be implemented in the utility model, can be applied to the field for needing multiple voltage levels
It closes.
Description of the drawings
Fig. 1 is DC-DC converter provided by the utility model topology；
Fig. 2 is the typical peripheral circuit frame diagram of DC-DC converter provided by the utility model topology.
Specific implementation mode
With reference to specific example and attached drawing, the utility model is described in further detail, and described is the solution to the utility model
It releases, rather than limits.
A kind of band provided by the utility model can be used for the field of direct current supply there are three the DC-DC converter of port topology
Institute.The topology takes full advantage of the design feature of converter, is multiplexed to device, has saved cost, and introduce synchronize it is whole
Flow Technique reduces on-state voltage drop and on-state loss, while realizing Sofe Switch to all switching tubes, reaches reduction switch damage
The effect of consumption so as to lifting switch frequency and ensures the efficiency of equipment.Further, since having multi-stage transformation, provide more
A direct current output port has the direct current input of wider range, and can realize the drop of larger multiple by reasonably designing
Pressure.
DC-DC converter provided by the utility model is topological, as shown in Figure 1, entering in terms of primary input port, includes successively
Converter filter capacitor C7, a Buck converter, a Boost, a phase-shifted full-bridge converter, converter filtering
Capacitance is used for steady voltage.
It is as shown in Figure 1, the input of phase-shifted full-bridge converter, i.e., empty at the output of Boost and a capacitance C8
Draw up a DC bus.Virtual DC bus can both can also be used as an output port as input port, and phase shift is complete
Bridge includes an inverter bridge and a rectification module, is another direct current output port of this topology at the output of rectification module.
In the topology, the first bridge arm that Buck converters part is connected in series by first switch pipe Q1 and the 4th switching tube Q4
Topology and inductance L1 are constituted, and the one end inductance L1 is series at first switch pipe Q1 and the 4th switching tube Q4 and connects the Coupling point to be formed
On.Buck converter circuit parts replace diode with MOSFET, to realize synchronous rectification；Buck converter circuit parts are opened
Other kinds of switching tube can also be used by closing pipe.
And the second bridge that Boost part is connected in series by inductance L1, second switch pipe Q2 and the 5th switching tube Q5
Arm topology and capacitance C8 are constituted, and the inductance L1 other ends are serially connected with second switch pipe Q2 and the 5th switching tube Q5 couplings in series
In chalaza, capacitance C8 is connected between Boost positive-negative input end mouth.Equally converted instead of conventional Boost with MOSFET
Diode in device, Buck converters and Boost series connection, together constitute the DC-DC converter of prime, they share
Inductance L1, the inductance can be single inductance, can also be inductance made of multiple inductance are equivalent.
The second bridge arm topological that phase-shifted full-bridge converter part is connected in series by second switch pipe Q2 and the 5th switching tube Q5,
The third bridge arm topological and resonant inductance L2, capacitance C10 that third switching tube Q3 and the 6th switching tube Q6 are connected in series with
And rectification module is constituted, rectification module includes transformer T1 and diode D7, D8, and the second bridge arm topological is converted as phase-shifting full-bridge
The leading-bridge of device, lagging leg of the third bridge arm topological as phase-shifted full-bridge converter, resonant inductance L2 contain transformer
Leakage inductance, the primary side and resonant inductance L2 of transformer T1, capacitance series connection, which is connected to second switch respectively
Coupling point and third switching tube Q3 and the 6th switching tube Q6 in series pipe Q2 and the 5th switching tube Q5 coupling in series
In chalaza.The secondary side both ends of transformer T1 concatenate diode D7, a D8 respectively, and the other end of two diodes links together,
The Coupling point to be formed is connected from diode D7, D8, the first terminal of the output end as phase-shifted full-bridge converter, transformer T1's
Second terminal of the centre tap as the output end of phase-shifted full-bridge converter.
DC-DC converter further includes filter inductance L3 and filter capacitor C9, filter inductance L3 series diodes D7, D8 connection
The Coupling point of formation, filter inductance L3 again series filtering capacitance C9 to transformer T1 pairs side centre cap, by filter inductance L3
Output filter is formed with filter capacitor C9, output filter is a low-pass filter, and the both ends of filter capacitor C9 are as DC-
DC converter output terminal mouths.
It can be seen that Buck converters part and phase-shifting full-bridge fractional reuse second switch pipe Q2 and the 5th switching tube Q5
The second bridge arm topological being connected in series.Allow converter to be made more compact, reduces cost, meanwhile, reduce switch
Pipe number, under same operating condition, reduce switching loss.
In addition, one diode of the both ends reverse parallel connection of each switching tube, at the same a capacitance in parallel, this two pole
Pipe and capacitance can be the parasitic components of switching tube, and can also be external individual devices can using these diodes and capacitance
To realize zero voltage switch (ZVS).
Buck converters realize the operation principle of Sofe Switch：The operation mode of Buck converters part in this topology is investigated,
Due to switching tube capacitance in parallel, when switching tube turns shutdown by opening, the voltage at switching tube both ends will relatively slowly
Ground rises, and to the higher switching current that is staggered, realizes zero voltage turn-off, reduces turn-off power loss, and when switching tube is turned by shutdown
When opening, due to the resonance that capacitance, inductance are formed, the voltage at capacitance both ends can pass through 0V, at this point, diode current flow, switching tube
Both end voltage is clamped at 0V, therefore can open switching tube under no-voltage, and to realize that no-voltage is open-minded, damage is opened in reduction
Consumption, above-mentioned is the Sofe Switch specific implementation of Buck circuit parts.In order to ensure prime Buck converters Sofe Switch realization,
Inductive current is required to drop to 0A, therefore, rationally designs the value of inductance, preceding stage DC-DC converter is made to work in discontinuously
Pattern (DCM).
Boost circuit part and phase-shifted full-bridge converter in DC-DC converter topology have shared by switching tube Q2 and have opened
The bridge arm that pipe Q5 is connected in series is closed, is since the bridge arm of phase-shifting full-bridge uses phase shifting control, the switching tube duty ratio in inverter bridge
Fixed, therefore, the duty ratio D of Boost is also fixed.It is actual in view of Boost is also at discontinuous mode
Transformation ratio will be greater than 1/ (1-D).
The tune to output voltage is realized by phase shifting control in phase-shifted full-bridge converter part in DC-DC converter topology
It saves, all switching tubes in inverter bridge can realize Sofe Switch.
The input terminal of phase-shifting full-bridge accesses a direct current input (the as output of Boost in this topology), leads to
Inverter bridge is crossed, obtains the bridge arm voltage of an exchange, and be linked into the primary side of transformer, transformer can provide a transformation
Than on the secondary side of inverter, carrying centre cap and rectifier diode, realizing uncontrollable rectifier.
Two half-bridges of inverter bridge make the control signals of two half-bridges there are an adjustable phase is poor by phase shifting control,
By controlling this phase difference, you can the duty ratio for controlling output voltage, to control output voltage size, therefore, at two
In half-bridge, the second bridge arm being made of second switch pipe Q2 and the 5th switching tube Q5 is known as leading-bridge, by third switching tube Q3
It is known as lagging leg with the third bridge arm of the 6th switching tube Q6 compositions.Between two half-bridges, other than being connected to rectification module, also go here and there
Resonant inductance L2 and capacitance C10 are joined, the capacitance of resonant inductance and the parallel connection of the switching tube both ends shape under certain operational modal
At resonance, to enable switching tube to realize zero voltage switch.
The Sofe Switch of phase whole-bridging circuit part is implemented as follows：When switching tube turns shutdown by opening, switching tube two
The voltage at end relatively slowly, to the higher switching current that is staggered will realize that no-voltage is closed due to capacitor charging, the process of rising
It is disconnected, turn-off power loss is reduced, and when switching tube turns on logical by turning off, due to the resonance that capacitance, inductance are formed, the electricity at capacitance both ends
Pressure can at a time be reduced to 0V, at this point, diode current flow, switching tube both end voltage is clamped at 0V, therefore can be zero
Switching tube is opened under voltage, to realize that no-voltage is open-minded, reduces turn-on consumption.
For clearer description the utility model, a kind of realization of Representative peripheral circuit of DC-DC converter is given,
As shown in Fig. 2, comprising main processor modules, sampling module, drive module and conditioning module.Buck is sampled by sampling module
The output of converter is input to after certain modulate circuit processing in processor, and processor is defeated according to the program of design
Go out to control signal, by drive module, drives first switch pipe Q1 and the 4th switching tube Q4 synchronization actions, and complementary switch, be
Avoid the occurrence of straight-through, first switch pipe Q1 and the 4th switching tube Q4 can be arranged appropriate dead zone；At the same time, rectification mould is sampled
The output of block is input in processor after certain modulate circuit processing, passes through the director demon designed in processor
Phase shift size is obtained, to export certain control signal, control signal can control the second bridge arm after drive module
The break-make of switching tube in topology and third bridge arm topological, to constitute the circuit of the closed loop comprising controller.
In the utility model, preceding stage DC-DC converter is connected in series by Buck converters and Boost, is one
Direct DC converter, and rear class converter is a phase-shifted full-bridge converter, including an inverter bridge and a rectifying conversion
Device carries the isolation of transformer, is an indirect d. c converter.
The topology takes full advantage of the design feature of converter, is multiplexed to device, and cost has been saved, and introduces same
Commutation technique is walked, on-state voltage drop and on-state loss is reduced, while Sofe Switch is realized to all switching tubes, reaches reduction and open
The effect for closing loss so as to lifting switch frequency and ensures the efficiency of equipment.Further, since having multi-stage transformation, provide
Multiple direct current output ports have the direct current input of wider range, and can realize larger multiple by reasonably designing
Decompression.
It should be understood that the application of the utility model is not limited to above-mentioned citing, those of ordinary skill in the art are come
It says, not difficult improvement or transformation based on the above description, all these modifications and variations should all belong to the utility model institute
In attached scope of the claims.
Claims (9)
1. a kind of DC-DC converter, which is characterized in that include：Inductance (L1), rectification module (4), the first bridge arm topological (1) and
Second bridge arm topological (2), third bridge arm topological (3) and capacitance (C8) in parallel, wherein the first bridge arm topological (1) is concatenated
First switch pipe (Q1) and the 4th switching tube (Q4), the second bridge arm topological (2) are that concatenated second switch pipe (Q2) and the 5th is opened
Close pipe (Q5), third bridge arm topological (3) is concatenated third switching tube (Q3) and the 6th switching tube (Q6)；First bridge arm topological
(1) the cathode connection of cathode and the second bridge arm topological (2), inductance (L1) one terminate first switch pipe (Q1) and the 4th switching tube
(Q4) on Coupling point in series, another termination second switch pipe (Q2) of inductance (L1) and the 5th switching tube (Q5) are in series
Coupling point on；
Rectification module (4) input terminal one terminates on second switch pipe (Q2) and second switch pipe (Q5) Coupling point in series,
It is whole on another termination third switching tube (Q3) of rectification module (4) input terminal and the 6th switching tube (Q6) Coupling point in series
Flow module (4) is used to AC conversion be direct current；The control signal and third bridge arm topological (3) of second bridge arm topological (2)
Control signal there are phase differences；
First bridge arm topological (1) and inductance (L1) constitute Buck converters, and Buck converters are for being depressured input voltage
Processing, the second bridge arm topological (2) and inductance (L1) constitute Boost, and Boost is for rising input voltage
Pressure processing, the second bridge arm topological (2), third bridge arm topological (3) and rectification module (4) constitute phase-shifted full-bridge converter, phase shift
Full-bridge converter is used to carry out buck or boost processing to input voltage；DC-DC converter opens up inductance (L1) and the second bridge arm
(2) are flutterred to be multiplexed.
2. DC-DC converter according to claim 1, which is characterized in that the both ends of the first bridge arm topological (1) are as DC-
The direct-flow input end of DC converters, first DC output end of the capacitance (C8) as DC-DC converter, the output end of rectification module
The second DC output end as DC-DC converter.
3. DC-DC converter according to claim 1, which is characterized in that the both ends of the first bridge arm topological (1) are as DC-
First direct-flow input end of DC converters, second direct-flow input end of the capacitance (C8) as DC-DC converter, rectification module it is defeated
First DC output end of the outlet as DC-DC converter.
4. DC-DC converter according to any one of claims 1 to 3, which is characterized in that rectification module includes a transformation
Device and two rectifier diodes, the input terminal of the primary side of transformer as rectification module, the both ends tap on the secondary side of transformer are each
The other end of one rectifier diode of series connection, two rectifier diodes is connected, the first port of the output end as rectification module,
Second port of the centre tap of transformer as the output end of rectification module.
5. DC-DC converter according to any one of claims 1 to 3, which is characterized in that in the first bridge arm topological (1)
It is parallel with diode and capacitance on each switching tube, switching tube in the first bridge arm topological (1) is made to realize Sofe Switch.
6. DC-DC converter according to any one of claims 1 to 3, which is characterized in that further include resonant inductance (L2) and
Capacitance (C10), resonant inductance (L2), primary transformer coil and capacitance (C10) are followed in series to form series arm,
One end of the series arm is connected to second switch pipe (Q2) and the 5th switching tube (Q5) Coupling point in series, the series connection
The another of branch is terminated at third switching tube (Q3) and the 6th switching tube (Q6) Coupling point in series, the second bridge arm topological
(2) and on each switching tube of third bridge arm topological (3) it is parallel with diode and capacitance, makes the second bridge arm topological (2) and third
Each switching tube of bridge arm topological (3) realizes Sofe Switch.
7. DC-DC converter according to claim 5, which is characterized in that diode in parallel and capacitance are on switching tube
The parasitic components or external device of switching tube.
8. DC-DC converter according to any one of claims 1 to 3, which is characterized in that DC-DC converter further includes defeated
Go out filter；Output filter includes filter inductance (L3) and filter capacitor (C9)；
Filter inductance one end (L3) is connect with the first terminal of the output end of rectification module (4), and the other end is as DC-DC converter
DC output end first terminal；
Filter capacitor one end (C9) is connect with the other end of filter inductance (L3), the same rectification module of filter capacitor (C9) other end
(4) Second terminal of output end connects, filter capacitor (C9) other end as DC-DC converter DC output end second
Terminal.
9. DC-DC converter according to any one of claims 1 to 3, which is characterized in that DC-DC converter further includes becoming
Parallel operation filter capacitor (C7), it is in parallel with the first bridge arm topological (1), it is used for steady voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721917570.2U CN207706055U (en) | 2017-12-29 | 2017-12-29 | A kind of DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721917570.2U CN207706055U (en) | 2017-12-29 | 2017-12-29 | A kind of DC-DC converter |
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| Publication Number | Publication Date |
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| CN207706055U true CN207706055U (en) | 2018-08-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994772A (en) * | 2017-12-29 | 2018-05-04 | 华中科技大学 | A kind of DC-DC converter |
| CN111404381A (en) * | 2019-01-03 | 2020-07-10 | 南京南瑞继保工程技术有限公司 | Power electronic transformer sub-module topology based on DAB and control method thereof |
-
2017
- 2017-12-29 CN CN201721917570.2U patent/CN207706055U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994772A (en) * | 2017-12-29 | 2018-05-04 | 华中科技大学 | A kind of DC-DC converter |
| CN111404381A (en) * | 2019-01-03 | 2020-07-10 | 南京南瑞继保工程技术有限公司 | Power electronic transformer sub-module topology based on DAB and control method thereof |
| CN111404381B (en) * | 2019-01-03 | 2023-08-08 | 南京南瑞继保工程技术有限公司 | DAB-based power electronic transformer submodule topology and control method thereof |
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