CN208433914U - A kind of more level isolation type bidirectional DC/DC translation circuits - Google Patents
A kind of more level isolation type bidirectional DC/DC translation circuits Download PDFInfo
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- CN208433914U CN208433914U CN201820601352.6U CN201820601352U CN208433914U CN 208433914 U CN208433914 U CN 208433914U CN 201820601352 U CN201820601352 U CN 201820601352U CN 208433914 U CN208433914 U CN 208433914U
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Abstract
A kind of more level isolation type bidirectional DC/DC translation circuits provided by the utility model, comprising: more than first levels full-bridge converter, transformer and more than second levels full-bridge converter；More than first levels full-bridge converter connects more than second levels full-bridge converter by the transformer；The connecting pin that more than first levels full-bridge converter and more than second levels full-bridge converter are not connected to the transformer is input terminal or output end, and more than first levels full-bridge converter and more than second levels full-bridge converter are the full-bridge converter that the clamped three level bridge arm of striding capacitance is constituted.In the utility model, more than first levels full-bridge converter and more than second levels full-bridge converter are the more levels full-bridge converters that can produce five level output voltage states, full-bridge converter relative to traditional two level bridge arms of use, output voltage capability can also be improved one times, can largely improve isolation type bidirectional DC/DC converter output voltage grade.
Description
Technical field
The utility model relates to electric power transformation field more particularly to a kind of more level isolation type bidirectional DC/DC transformation electricity
Road.
Background technique
Many revolutionary changes have taken place in modern transmission and distribution network, and the demand to direct current transmission and distribution is increasing.It is negative
Lotus center is more and more the electric power for being fixed against long-distance sand transport, or dependent on development of renewable energies such as Large Scale Wind Farm Integrations
Electricity.Direct current transportation mode has a clear superiority in terms of long distance power transmission or generation of electricity by new energy access.Also include in distribution side
The distributed generation resource, such as photovoltaic power generation, battery energy storage etc. of more and more single flow.Even with wind-power electricity generation, use
Direct current mode can also reduce power conversion link.More and more loads are needed using direct current supply.Such as data center,
LED, electric car etc..And a large amount of consumption figure electronics, such as personal computer, mobile phone and tablet computer etc..In power distribution network
By the way of direct current, the features such as less transmission of electricity corridor can be occupied, and its quick controllability can be utilized, city is solved
The problems such as power supply present in power supply is difficult, at high cost and trend is difficult to control, maintains the safe and reliable economy of urban distribution network
Operation.
DC voltage is difficult to realize voltage transformation by magnetic-coupled mode as AC transformer, it is therefore necessary to be based on
Power electronic technique realizes the transformation of DC voltage and the transmitting of power by DC/DC translation circuit.For needing electrical isolation
DC converting occasion or two sides DC voltage level differ biggish occasion, still needed in DC/DC translation circuit using becoming
Depressor.But since Industrial Frequency Transformer is bulky, quality is heavy, loss is larger and noise is very big, it is difficult to realize power and turns
Change the high power density and high efficiency of system.Traditional Industrial Frequency Transformer is replaced to be generally considered by using high frequency transformer
The inevitable development trend of next-generation power conversion.Using the advantage of high frequency transformer scheme be device it is small in size, light-weight,
It is at low cost, and can avoid traditional Industrial Frequency Transformer since iron core magnetic saturation causes the problem of voltage current waveform distorts in system；
If switching frequency is increased to 20kHz or more, the running noises of device can be more greatly reduced.The power especially in smart grid
Under the more more and more universal overall background of transformation system, high-frequency isolation power conversion technology has a extensive future.
Two-way DC/DC translation circuit based on high frequency transformer isolation is commonly utilized in the next generation as core circuit
It presses in power conversion system.The two-way DC/DC translation circuit of high-frequency isolation mainly by two full-bridge converters and a high frequency every
It is formed from transformer.By the square-wave voltage for controlling full-bridge converter high-frequency ac outlet side, so that it may which control is added in auxiliary electricity
Feel the size and phase of both end voltage, and then controls the size and flow direction of power.Current full-bridge converter mostly uses greatly two electricity
Flat full-bridge circuit.In the limited situation of voltage class of switching device, voltage that two Level Full Bridge circuits can export
It is restricted, keeps the two-way DC/DC translation circuit for realizing high-voltage large-capacity difficult, application field is also restrained.
Utility model content
The utility model proposes a kind of more level isolation type bidirectional DCs/DC translation circuit working principles, for existing
The shortcomings that two-way DC/DC translation circuit, the full-bridge converter constituted using the clamped three level bridge arm of striding capacitance, to improve isolation
The output voltage capability of the two-way DC/DC transformation of formula.
A kind of more level isolation type bidirectional DC/DC translation circuits provided by the utility model, comprising: more than first Level Full Bridge
Converter, transformer and more than second levels full-bridge converter；
More than first levels full-bridge converter connects more than second levels full-bridge converter by the transformer；
More than first levels full-bridge converter and more than second levels full-bridge converter are not connected to the transformer
Connecting pin is input terminal or output end；
More than first levels full-bridge converter and more than second levels full-bridge converter are striding capacitance clamped three
The full-bridge converter that level bridge arm is constituted.
Preferably, more than first levels full-bridge converter and more than second levels full-bridge converter are not connected to the change
The connecting pin of depressor is that input terminal or output end specifically include two kinds of connection types；
The first connection type are as follows:
The connecting pin that more than first levels full-bridge converter is not connected to the transformer is input terminal, electric more than described second
The connecting pin that flat full-bridge converter is not connected to the transformer is output end；
Second of connection type are as follows:
The connecting pin that more than first levels full-bridge converter is not connected to the transformer is output end, electric more than described second
The connecting pin that flat full-bridge converter is not connected to the transformer is input terminal.
Preferably, more than first levels full-bridge converter and more than the second levels full-bridge converter circuit structure phase
Together；
More than first levels full-bridge converter includes: first switch S1, second switch S2, third switch S3, the 4th opens
Close S4, first diode D1, the second diode D2, third diode D3, the 4th diode D4, first capacitor C1, the 5th switch
S5, the 6th switch S6, the 7th switch S7, the 8th switch S8, the 5th diode D5, the 6th diode D6, the 7th diode D7,
Eight diode D8, the second capacitor C2 and third capacitor C3；
The collector of the first switch S1, the cathode of the first diode D1, the 5th switch S5 collector,
The anode of the cathode of the 5th diode D5 and the third capacitor C3 constitute more than first Level Full Bridge after being connected with each other
The direct current plus end DC1 of converter；
The emitter of the first switch S1, the anode of the first diode D1, the second switch S2 collector,
The cathode of the second diode D2 and the anode of the first capacitor C1 are connected with each other；
The emitter of the second switch S2, the anode of the second diode D2, the third switch S3 collector
One that more Level Full Bridge translation circuits are constituted after being connected with each other with the cathode of the third diode D3 exchanges line end AC1；
The emitter of the third switch S3, the anode of the third diode D3, the 4th switch S4 collector,
The cathode of the 4th diode D4 and the cathode of the first capacitor C1 are connected with each other；
The emitter of the 4th switch S4, the anode of the 4th diode D4, the 8th switch S8 emitter,
The cathode of the anode of the 8th diode D8 and the third capacitor C3 constitute more levels full-bridge converters after being connected with each other
Direct current negative terminal DC2；
The emitter of the 5th switch S5, the anode of the 5th diode D5, the 6th switch S6 collector,
The anode of the cathode of the 6th diode D6 and the second capacitor C2 are connected with each other；
The emitter of the 6th switch S6, the anode of the 6th diode D6, the 7th switch S7 collector
One that more levels full-bridge converters are constituted after being connected with each other with the cathode of the 7th diode D7 exchanges line end AC2；
The emitter of the 7th switch S7, the anode of the 7th diode D7, the 8th switch S8 collector,
The cathode of the cathode of the 8th diode D8 and the second capacitor C2 are connected with each other；
The exchange line end AC1 exchanges the line end AC2 connection transformer with described；
The direct current plus end DC1 and direct current negative terminal DC2 is the connecting pin for being not connected to the transformer.
Preferably, the transformer is intermediate frequency or high-frequency isolation transformer.
Preferably, the working frequency of the transformer is greater than or equal to 200Hz.
As can be seen from the above technical solutions, the utility model embodiment has the advantage that
A kind of more level isolation type bidirectional DC/DC translation circuits provided by the utility model, comprising: more than first Level Full Bridge
Converter, transformer and more than second levels full-bridge converter；More than first levels full-bridge converter is connected by the transformer
Connect more than second levels full-bridge converter；More than first levels full-bridge converter and more than second levels full-bridge converter
The connecting pin for being not connected to the transformer is input terminal or output end, more than first levels full-bridge converter and described more than second
Levels full-bridge converter is the full-bridge converter that the clamped three level bridge arm of striding capacitance is constituted.In the utility model, more than first
Levels full-bridge converter and more than second levels full-bridge converter are the more Level Full Bridges that can produce five level output voltage states
Converter, relative to the full-bridge converter of two level bridge arms of traditional use, output voltage capability can also be improved one times, can be with
Largely improve isolation type bidirectional DC/DC converter output voltage grade.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the structural schematic diagram of more level isolation type bidirectional DC/DC translation circuits provided by the utility model.
Fig. 2 is more levels full-bridge converter structures of more level isolation type bidirectional DC/DC translation circuits of the utility model
Schematic diagram.
Fig. 3, Fig. 4 and Fig. 5 are more Level Full Bridges in the more level isolation type bidirectional DC/DC translation circuits of the utility model respectively
Three kinds of voltage output status diagrams of the clamped three level bridge arm of a striding capacitance in converter.
Specific embodiment
The utility model proposes a kind of more level isolation type bidirectional DCs/DC translation circuit working principles, for existing
The shortcomings that two-way DC/DC translation circuit, the full-bridge converter constituted using the clamped three level bridge arm of striding capacitance, to improve isolation
The output voltage capability of the two-way DC/DC transformation of formula.
Referring to Fig. 1, a kind of more level isolation type bidirectional DC/DC translation circuits provided by the utility model, comprising: first
More levels full-bridge converters, transformer and more than second levels full-bridge converter；
More than first levels full-bridge converter connects more than second levels full-bridge converter by transformer；
More than first levels full-bridge converter and more than second levels full-bridge converter are not connected to the connecting pin of transformer as input
End or output end.
In Fig. 1, the connecting pin of more than first levels full-bridge converter connection transformer is AC1 and AC2, more than first Level Full Bridge
The connecting pin that converter is not connected to transformer is DC1 and DC2 (i.e. input terminal or output end), and more than second levels full-bridge converter connects
The connecting pin for connecing transformer is AC1*And AC2*, the connecting pin that more than second levels full-bridge converter is not connected to transformer is DC1*With
DC2*(i.e. input terminal or output end).
More than first levels full-bridge converter and more than second levels full-bridge converter are the clamped three level bridge arm structure of striding capacitance
At full-bridge converter.The utility model, which is provided, constitutes full-bridge circuit with the clamped three level bridge arm of striding capacitance, relative to
Traditional two Level Full Bridge translation circuits, output voltage grade can be improved one times, can largely improve isolated two-way
The output voltage grade of DC/DC translation circuit.
Further, more than first levels full-bridge converter and more than second levels full-bridge converter are not connected to the connection of transformer
End is that input terminal or output end specifically include two kinds of connection types；
The first connection type are as follows:
The connecting pin that more than first levels full-bridge converter is not connected to transformer is input terminal, more than second levels full-bridge converter
The connecting pin for being not connected to transformer is output end；
Second of connection type are as follows:
The connecting pin that more than first levels full-bridge converter is not connected to transformer is output end, more than second levels full-bridge converter
The connecting pin for being not connected to transformer is input terminal.
The power of i.e. more level isolation type bidirectional DC/DC translation circuits can flow to output end from input terminal, or from output
End flows into input terminal.
Further, more than first levels full-bridge converter and more than second levels full-bridge converter circuit structure are identical；
More than first levels full-bridge converter include: first switch S1, second switch S2, third switch S3, the 4th switch S4,
First diode D1, the second diode D2, third diode D3, the 4th diode D4, first capacitor C1, the 5th switch S5,
Six switch S6, the 7th switch S7, the 8th switch S8, the 5th diode D5, the 6th diode D6, the 7th diode D7, the eight or two
Pole pipe D8, the second capacitor C2 and third capacitor C3；
Collector, the cathode of first diode D1, the collector of the 5th switch S5, the 5th diode D5 of first switch S1
Cathode and third capacitor C3 anode be connected with each other after constitute the direct current plus end DC1 of more than first levels full-bridge converter；
The emitter of first switch S1, the anode of first diode D1, the collector of second switch S2, the second diode D2
Cathode and first capacitor C1 anode be connected with each other；
The emitter of second switch S2, the anode of the second diode D2, third switch S3 collector and third diode
The cathode of D3 constitutes an exchange line end AC1 of more Level Full Bridge translation circuits after being connected with each other；
The emitter of third switch S3, the anode of third diode D3, the 4th switch S4 collector, the 4th diode D4
Cathode and first capacitor C1 cathode be connected with each other；
The emitter of 4th switch S4, the anode of the 4th diode D4, the 8th switch S8 emitter, the 8th diode D8
Anode and third capacitor C3 cathode be connected with each other after constitute the direct current negative terminal DC2 of more levels full-bridge converters；
The emitter of 5th switch S5, the anode of the 5th diode D5, the 6th switch S6 collector, the 6th diode D6
Cathode and the second capacitor C2 anode be connected with each other；
The emitter of 6th switch S6, the anode of the 6th diode D6, the 7th switch S7 collector and the 7th diode
The cathode of D7 constitutes an exchange line end AC2 of more levels full-bridge converters after being connected with each other；
The emitter of 7th switch S7, the anode of the 7th diode D7, the 8th switch S8 collector, the 8th diode D8
Cathode and the second capacitor C2 cathode be connected with each other；
Exchange line end AC1 with exchange line end AC2 connection transformer；
Direct current plus end DC1 and direct current negative terminal DC2 is the connecting pin for being not connected to transformer.
More than first levels full-bridge converter and more than second levels full-bridge converter circuit structure are identical, i.e., more than second level is complete
Bridging converter circuit structure can refer to Fig. 2, be succinct, the circuit of more than the second levels full-bridge converter circuit of not repeated description herein
Structure.
Circuit structure according to the present utility model, in conjunction with Fig. 2, will be described in detail below the utility model working principle and
The course of work:
If the DC voltage in more levels full-bridge converters on capacitor C1 and C2 is E, the DC voltage on capacitor C3 is 2E,
Left bridge arm control mode and voltage output by taking the left bridge arm in more levels full-bridge converters as an example, in more levels full-bridge converters
State is as follows:
1) when switch S1 is open-minded, switch S2 conducting, switch S3 shutdown, switch S4 is turned off, as shown in figure 3, more Level Full Bridges
Left bridge arm AC1 terminal in converter is 2E to the output voltage between DC2 terminal.
2) when switch S1 is turned off, switch S2 conducting, switch S3 shutdown, switch S4 is open-minded, as shown in figure 4, more Level Full Bridges
Left bridge arm AC1 terminal in converter is E to the output voltage between DC2 terminal；
3) when switch S1 is turned off, switch S2 shutdown, switch S3 is open-minded, and switch S4 is open-minded, as shown in figure 5, more Level Full Bridges
Left bridge arm AC1 terminal in converter is 0 to the output voltage between DC2 terminal；
As described above, the left bridge arm AC1 terminal in more levels full-bridge converters is can to the output voltage between DC2 terminal
To export tri- kinds of 0, E, 2E voltage status.Equally, the right bridge arm AC2 terminal in more levels full-bridge converters is between DC2 terminal
Output voltage be can also export tri- kinds of voltage status of 0, E, 2E.Left and right bridge arm is formed into levels full-bridge converter more than one,
Output voltage between AC1 terminal in more levels full-bridge converters and AC2 terminal can export five kinds of -2E,-E, 0, E, 2E voltages
State.
More than first levels full-bridge converter and more than second levels full-bridge converter are all above-mentioned principles.
Due to using the clamped three level bridge arm of single-phase striding capacitance in the full-bridge converter of the utility model, relative to biography
The full-bridge converter of the two level bridge arms of use of system, each full-bridge converter can produce five level output voltage states, export
Voltage capability can also be improved one times, can largely improve isolation type bidirectional DC/DC converter output voltage grade.
Further, transformer can be intermediate frequency or high-frequency isolation transformer.
Further, the working frequency f of transformer may be greater than or be equal to 200Hz.
The utility model is described in detail above, it is practical new according to this for those of ordinary skill in the art
The thought of type embodiment, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification
It should not be construed as a limitation of the present invention.
Claims (4)
1. a kind of more level isolation type bidirectional DC/DC translation circuits characterized by comprising more than first levels full-bridge converter,
Transformer and more than second levels full-bridge converter；
More than first levels full-bridge converter connects more than second levels full-bridge converter by the transformer；
The company for being not connected to the transformer of more than first levels full-bridge converter and more than second levels full-bridge converter
Connecing end is input terminal or output end；
More than first levels full-bridge converter and more than second levels full-bridge converter are clamped three level of striding capacitance
The full-bridge converter that bridge arm is constituted；
More than first levels full-bridge converter is identical with more than the second levels full-bridge converter circuit structure；
More than first levels full-bridge converter include: first switch S1, second switch S2, third switch S3, the 4th switch S4,
First diode D1, the second diode D2, third diode D3, the 4th diode D4, first capacitor C1, the 5th switch S5,
Six switch S6, the 7th switch S7, the 8th switch S8, the 5th diode D5, the 6th diode D6, the 7th diode D7, the eight or two
Pole pipe D8, the second capacitor C2 and third capacitor C3；
The collector of the first switch S1, the cathode of the first diode D1, the 5th switch S5 collector, described
The anode of the cathode of 5th diode D5 and the third capacitor C3 constitute more than the first Level Full Bridge transformation after being connected with each other
The direct current plus end DC1 of device；
The emitter of the first switch S1, the anode of the first diode D1, the second switch S2 collector, described
The anode of the cathode of second diode D2 and the first capacitor C1 are connected with each other；
The emitter of the second switch S2, the anode of the second diode D2, the collector of the third switch S3 and institute
State third diode D3 cathode be connected with each other after constitute an exchange line end AC1 of more Level Full Bridge translation circuits；
The emitter of the third switch S3, the anode of the third diode D3, the 4th switch S4 collector, described
The cathode of the cathode of 4th diode D4 and the first capacitor C1 are connected with each other；
The emitter of the 4th switch S4, the anode of the 4th diode D4, the 8th switch S8 emitter, described
The cathode of the anode of 8th diode D8 and the third capacitor C3 constitute the direct current of more levels full-bridge converters after being connected with each other
Negative terminal DC2；
The emitter of the 5th switch S5, the anode of the 5th diode D5, the 6th switch S6 collector, described
The anode of the cathode of 6th diode D6 and the second capacitor C2 are connected with each other；
Emitter, the anode of the 6th diode D6, the collector of the 7th switch S7 and the institute of the 6th switch S6
State the 7th diode D7 cathode be connected with each other after constitute an exchange line end AC2 of more levels full-bridge converters；
The emitter of the 7th switch S7, the anode of the 7th diode D7, the 8th switch S8 collector, described
The cathode of the cathode of 8th diode D8 and the second capacitor C2 are connected with each other；
The exchange line end AC1 exchanges the line end AC2 connection transformer with described；
The direct current plus end DC1 and direct current negative terminal DC2 is the connecting pin for being not connected to the transformer.
2. a kind of more level isolation type bidirectional DC/DC translation circuits according to claim 1, which is characterized in that described first
More levels full-bridge converters and more than second levels full-bridge converter be not connected to the transformer connecting pin be input terminal or
Output end specifically includes two kinds of connection types；
The first connection type are as follows:
The connecting pin for being not connected to the transformer of more than first levels full-bridge converter is input terminal, more than second level
The connecting pin for being not connected to the transformer of full-bridge converter is output end；
Second of connection type are as follows:
The connecting pin for being not connected to the transformer of more than first levels full-bridge converter is output end, more than second level
The connecting pin for being not connected to the transformer of full-bridge converter is input terminal.
3. a kind of more level isolation type bidirectional DC/DC translation circuits according to claim 1, which is characterized in that the transformation
Device is intermediate frequency or high-frequency isolation transformer.
4. a kind of more level isolation type bidirectional DC/DC translation circuits according to claim 1, which is characterized in that the transformation
The working frequency of device is greater than or equal to 200Hz.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112928917A (en) * | 2021-02-01 | 2021-06-08 | 西北工业大学 | Flight capacitance balancing circuit and method of three-level step-down DC-DC converter |
| CN115441757A (en) * | 2022-08-30 | 2022-12-06 | 江苏科曜能源科技有限公司 | Five-level PWM rectifier and power supply equipment |
-
2018
- 2018-04-25 CN CN201820601352.6U patent/CN208433914U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112928917A (en) * | 2021-02-01 | 2021-06-08 | 西北工业大学 | Flight capacitance balancing circuit and method of three-level step-down DC-DC converter |
| CN112928917B (en) * | 2021-02-01 | 2024-01-23 | 西北工业大学 | Flying capacitor balancing circuit and method for three-level step-down DC-DC converter |
| CN115441757A (en) * | 2022-08-30 | 2022-12-06 | 江苏科曜能源科技有限公司 | Five-level PWM rectifier and power supply equipment |
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