CN209516948U - A kind of isolation bidirectional DC-DC converter - Google Patents
A kind of isolation bidirectional DC-DC converter Download PDFInfo
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- CN209516948U CN209516948U CN201920298827.3U CN201920298827U CN209516948U CN 209516948 U CN209516948 U CN 209516948U CN 201920298827 U CN201920298827 U CN 201920298827U CN 209516948 U CN209516948 U CN 209516948U
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Abstract
A kind of isolation bidirectional DC-DC converter, comprising: high voltage protective module protects the first primary voltage and the second target voltage；Voltage regulating module carries out pressure regulation to the first primary voltage after high voltage protective to generate one or more first voltage, and carry out pressure regulation to one or more second voltage to generate the second target voltage；DC-DC isolated variable module carries out inversion rectification to one or more first voltage to generate one or more first target voltage, and carries out inversion to the second primary voltage after low-voltage variation and rectify to generate one or more second voltage；Low-voltage variation module protects first target voltage and the second primary voltage.Realize the seamless switching of isolation bidirectional DC-DC converter fair current decompression mode and adverse current boost mode, switching loss is low, it is energy saving, and the isolation bidirectional DC-DC converter may be implemented in wide scope operating voltage and high voltage (such as voltage of 1500V or more) under the conditions of work.
Description
Technical field
The utility model belongs to two-way DC converter technical field more particularly to a kind of isolation bidirectional DC-DC converter.
Background technique
As the extensive development of new energy utilizes, to solve wind-powered electricity generation, the intermittence of photoelectricity, instability problem, photovoltaic
The fluctuation of power generation is unable to satisfy the requirement that user side is continuously powered, and power generation needs to provide multiple forms of energy to complement each other or bulk power grid supports and smoothly
So that energy storage industry is developed.(Direct current-Direct current converter, bi-directional DC-DC become BDC
Parallel operation) since the two-way flow of energy may be implemented, using also more and more extensive in energy storage industry.On the other hand it is imitating
Under the driving of rate and cost, photovoltaic system voltage is also ceaselessly being promoted.Before 5 years, the system voltage of 600V is photovoltaic plant
Mainstream voltage, before 5 years so far, the system voltage of 1000V are the system voltage standards of entire photovoltaic plant.With photovoltaic technology
Constantly bring forth new ideas, the especially innovation of material technology, photovoltaic system voltage can be improved constantly, will be had from now on more and more
Photovoltaic system uses 1500V.
Currently, traditional bidirectional DC-DC converter is generally regulating circuit and two-way full-bridge LLC resonant converter, this change
Parallel operation can be realized the seamless switching of fair current decompression and adverse current boost mode, but since original on high-tension side voltage is up to
1500V, therefore stabilized switch device is also required to bear the shutdown voltage of 1500V.In view of the drop volume of switching device uses, referring to
" IPC9592 (power conversion apparatus performance parameter standard) regulation ", switching device has to using voltage rating 1800V's or so
Device.And SIC MOSFET (main material is the broad stopband MOSFET that silicon carbide is constituted) highest only has CREE public currently on the market
The 1700V and part IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) of department are full
The original on high-tension side voltage of foot is up to the application demand of 1500V or more, and wherein SIC MOSFET hands over the phase long there are expensive
And not exclusively meet the shortcomings that IPC9592 answers force request；Although IGBT be easy buying and it is cheap, switching loss is big, dissipate
Heat is difficult to handle.High-tension Switch Devices be used directly in original on high-tension side voltage be 1500V or more condition of high voltage under into
The electromagnetic interference EMI (Electromagnetic Interference, electromagnetic interference) that row switching generates is difficult.
Summary of the invention
In view of this, the utility model embodiment provides a kind of isolation bidirectional DC-DC converter, it is intended to solve traditional
At high cost present in technical solution, the difficult acquisition of raw material (component) and loss are big, it is difficult to radiate, and electromagnetic interference is intractable to ask
Topic.
The first aspect of the utility model embodiment provides a kind of isolation bidirectional DC-DC converter, comprising:
High voltage protective module for being protected to the first primary voltage and the second target voltage.
It is connect with the high voltage protective module, for original to described first after the high voltage protective module protection
Voltage carries out pressure regulation to generate one or more first voltage, and carries out pressure regulation to one or more second voltage with life
At the voltage regulating module of second target voltage.
It is connect with the voltage regulating module, for carrying out inversion rectification one or more described first voltage to generate one
A or multiple first target voltage, and inversion rectification is carried out to the second primary voltage after low-voltage variation module protection
To generate the DC-DC isolated variable module of one or more second voltage.
The low-voltage variation module is connect with the DC-DC isolated variable module, for the first target voltage and
Second primary voltage is protected.
In one embodiment, the voltage regulating module includes one or more pressure regulation units.
The pressure regulation unit be used for after the high voltage protective module protection first primary voltage carry out pressure regulation with
The first voltage is generated, and pressure regulation is carried out to generate second target voltage to the second voltage.
In one embodiment, the pressure regulation unit includes first capacitor, the second capacitor, the first field-effect tube, second
Effect pipe, third field-effect tube, the 4th field-effect tube, the first inductance, the second inductance and third capacitor.
The first end of the first capacitor is connect with the drain electrode of first field-effect tube, the second end of the first capacitor
It is connect with the first end of second capacitor.
The source electrode of first field-effect tube is connect with the drain electrode of the third field-effect tube, the third field-effect tube
Source electrode is connect with the second end of the drain electrode of the 4th field-effect tube and the first capacitor, the source electrode of the 4th field-effect tube
It is connect with the drain electrode of second field-effect tube, the second end of the source electrode of second field-effect tube and second capacitor connects
It connects.
The first end of first inductance is connect with the drain electrode of the third field-effect tube, the second end of first inductance
It is connect with the first end of the third capacitor, the second end of the third capacitor is connect with the first end of second inductance, institute
The second end for stating the second inductance is connect with the source electrode of the 4th field-effect tube.
It is the of the pressure regulation unit that the first end of the first capacitor and the second end of second capacitor, which collectively form,
Second target voltage output end of one primary voltage input terminal and the pressure regulation unit.
It is the of the pressure regulation unit that the first end of the third capacitor and the second end of the third capacitor, which collectively form,
The second voltage input terminal of one voltage output end and the pressure regulation unit.
In one embodiment, the pressure regulation unit includes the 4th capacitor, the 5th capacitor, the 6th capacitor, the 7th capacitor, the
Three inductance, the 5th field-effect tube, the 6th field-effect tube, the 7th field-effect tube and the 8th field-effect tube.
The first end of 4th capacitor is connect with the drain electrode of the 5th field-effect tube, the second end of the 4th capacitor
It is connect with the first end of the 5th capacitor.
The first end of the source electrode of 5th field-effect tube and the drain electrode of the 7th field-effect tube and the third inductance
Connection, the source electrode of the 7th field-effect tube connect with the first end of the 6th capacitor, the second end of the 6th capacitor and
The first end of 7th capacitor is connected with the second end of the 4th capacitor.
The second end of 7th capacitor is connect with the drain electrode of the 8th field-effect tube, the source of the 8th field-effect tube
Pole is connect with the drain electrode of the second end of the third inductance and the 6th field-effect tube, the source electrode of the 6th field-effect tube with
The second end of 5th capacitor connects.
It is the of the pressure regulation unit that the first end of 4th capacitor and the second end of the 5th capacitor, which collectively form,
Second target voltage output end of one primary voltage input terminal and the pressure regulation unit.
It is the of the pressure regulation unit that the first end of 6th capacitor and the second end of the 7th capacitor, which collectively form,
The second voltage input terminal of one voltage output end and the pressure regulation unit.
In one embodiment, the DC-DC isolated variable module includes and multiple corresponding DC-DC of pressure regulation unit
Converter unit.Wherein, DC-DC converter unit includes one or more DC-DC transformation subelement.
The DC-DC converts subelement
The tertiary voltage of exchange is generated when being depressured work for fair current to the first voltage progress inversion of direct current, it is inverse
The 6th voltage of exchange is rectified to generate the inversion rectification unit of the second voltage of direct current when stream boosting work.
It is connect with the inversion rectification unit, for carrying out voltage conversion and resonance to the tertiary voltage of exchange with life
At the 4th voltage of exchange, and voltage conversion is carried out to the 5th voltage of exchange and generates the 6th electricity exchanged with resonance
The transformation resonant element of pressure.
It is connect with the transformation resonant element, it is whole for being carried out when fair current is depressured work to the 4th voltage of exchange
Stream to generate the first target voltage of direct current, and when adverse current boosts work to the low-voltage variation module protection after
Second primary voltage carries out inversion to generate the commutation inversion unit of the 5th voltage of exchange.
In one embodiment, the commutation inversion unit includes the 9th field-effect tube, the tenth field-effect tube, the 11st
Effect pipe and the 12nd field-effect tube.
9th field-effect tube drain electrode and the 12nd field-effect tube source electrode collectively form for it is described rectification it is inverse
Become the first voltage input terminal of unit and the second voltage output end of the commutation inversion unit.
The drain electrode of 9th field-effect tube is connect with the drain electrode of the tenth field-effect tube, the 9th field-effect tube
Source electrode is connect with the drain electrode of the 12nd field-effect tube.
The source electrode of 12nd field-effect tube is connect with the source electrode of the 11st field-effect tube.
The drain electrode of 11st field-effect tube is connect with the source electrode of the tenth field-effect tube.
The source electrode of 9th field-effect tube and the source electrode of the tenth field-effect tube collectively form as the commutation inversion
6th voltage input end of the tertiary voltage output end of unit and the commutation inversion unit.
In one embodiment, the transformation resonant element includes the first transformer, the 4th inductance, the 5th inductance and the
Eight capacitors.
It is described that the second end of the primary side winding of the first end and first transformer of 4th inductance, which collectively forms,
6th voltage output end of the tertiary voltage input terminal of transformation resonant element and the transformation resonant element.
The second end of 4th inductance is connect with the first end of the 8th capacitor, the second end of the 8th capacitor with
The first end of the primary side winding of first transformer is connected with the first end of the 5th inductance, and the second of the 5th inductance
End is connect with the second end of the primary side winding of first transformer.
The second end of the vice-side winding of the first end of the vice-side winding of first transformer and first transformer is total
It is same to be configured to the 4th voltage output end of the transformation resonant element and the 5th voltage input end of the transformation resonant element.
In one embodiment, the transformation resonant element includes the second transformer, the 6th inductance, the 7th inductance, the 8th
Inductance and the 9th capacitor.
The first end of 6th inductance and the second end of the 6th inductance collectively form as the transformation resonant element
Tertiary voltage input terminal and the transformation resonant element the 6th voltage output end.
The first end of 6th inductance is connect with the first end of the 7th inductance, the second end of the 7th inductance with
The first end of 9th capacitor connects, the second end of the 9th capacitor and the first end and described second of the 8th inductance
The first end of the primary side winding of transformer connects, the second end of the 6th inductance and the second end of the 8th inductance and described
The second end of the primary side winding of second transformer connects.
The second end of the vice-side winding of the first end of the vice-side winding of second transformer and second transformer is total
It is same to be configured to the 4th voltage output end of the transformation resonant element and the 5th voltage input end of the transformation resonant element.
In one embodiment, the commutation inversion unit includes the 13rd field-effect tube, the 14th field-effect tube, the tenth
Five field-effect tube and the 16th field-effect tube.
The source electrode of 13rd field-effect tube is connect with the drain electrode of the 16th field-effect tube, the 13rd effect
Should the drain electrode of pipe connect with the drain electrode of the 14th field-effect tube.
The source electrode of 14th field-effect tube is connected with the drain electrode of the 15th field-effect tube, the 15th effect
Should the source electrode of pipe connect with the source electrode of the 16th field-effect tube.
The drain electrode of the source electrode and the 15th field-effect tube of 13rd field-effect tube collectively forms as the rectification
4th voltage input end of inversion unit and the 5th voltage output end of the commutation inversion unit.
The drain electrode of 14th field-effect tube and the source electrode of the 15th field-effect tube collectively form as the rectification
Second primary voltage input terminal of the first target voltage output end of inversion unit and the commutation inversion unit.
In one embodiment, the high voltage protective module includes:
For carrying out overvoltage protection to first primary voltage, and overvoltage protection is carried out to second target voltage
High voltage fault protective module.
It is connect with the high voltage fault protective module, for described first after high voltage fault protective module protection
What the transient current peak value of second target voltage after the transient current peak value and polarity protection of primary voltage was inhibited
High voltage surge protective module.
Connect with the high voltage surge protective module, for after being protected to high voltage surge first primary voltage and institute
State the high pressure polarity protective module that the second target voltage carries out polarity protection.
In one embodiment, the low-voltage variation module includes:
For carrying out polarity protection to the first target voltage, and to described the after surge protection and error protection
The low pressure polarity protection module of two primary voltages progress polarity protection.
It is connect with the low pressure polarity protection module, for described first after the low pressure polarity protection module protection
Target voltage and second primary voltage carry out overvoltage protection, and to described in after the low pressure polarity protection module protection
The low pressure surge that the transient current peak value of the transient current peak value of first target voltage and second primary voltage is inhibited
Failure protection module.
The utility model embodiment protects on high-tension side circuit by high voltage protective module, passes through voltage regulating module tune
Voltage is saved, fair current decompression is carried out to voltage by DC-DC isolated variable module and adverse current boosting is adjusted, passes through low-voltage variation module
The circuit of low-pressure side is protected, the nothing of isolation bidirectional DC-DC converter fair current decompression and adverse current boost mode may be implemented
Seaming and cutting are changed, and Sofe Switch control can reduce switching loss, improve the efficiency of isolation bidirectional DC-DC converter, energy saving, and
The isolation bidirectional DC-DC converter may be implemented in work under the conditions of wide scope, high voltage (such as voltage of up to 1500V or more)
Make.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this is practical new
Some embodiments of type for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram for isolation bidirectional DC-DC converter that an embodiment of the present invention provides；
Fig. 2 is a kind of another structural representation for isolation bidirectional DC-DC converter that an embodiment of the present invention provides
Figure；
Fig. 3 is a kind of one kind of the pressure regulation unit for isolation bidirectional DC-DC converter that an embodiment of the present invention provides
Exemplary circuit schematic diagram；
Fig. 4 is a kind of pressure regulation unit for isolation bidirectional DC-DC converter that an embodiment of the present invention provides in fair current
A kind of Example Principles figure of duty ratio under decompression mode；
Fig. 5 is a kind of pressure regulation unit for isolation bidirectional DC-DC converter that an embodiment of the present invention provides in fair current
The Example Principles figure of another duty ratio under decompression mode；
Fig. 6 is a kind of the another of the pressure regulation unit for isolation bidirectional DC-DC converter that an embodiment of the present invention provides
Kind exemplary circuit schematic diagram；
Fig. 7 is a kind of DC-DC isolated variable for isolation bidirectional DC-DC converter that an embodiment of the present invention provides
The structural schematic diagram of unit；
Fig. 8 is a kind of structural schematic diagram of DC-DC isolated variable subelement that bidirectional DC-DC converter is isolated；
Fig. 9 is a kind of DC-DC isolated variable for isolation bidirectional DC-DC converter that an embodiment of the present invention provides
A kind of exemplary circuit schematic diagram of unit；
Figure 10 is a kind of DC-DC isolated variable for isolation bidirectional DC-DC converter that an embodiment of the present invention provides
Another exemplary circuit schematic diagram of subelement；
Figure 11 is a kind of high voltage protective module for isolation bidirectional DC-DC converter that an embodiment of the present invention provides
Structural schematic diagram；
Figure 12 is a kind of low-voltage variation module for isolation bidirectional DC-DC converter that an embodiment of the present invention provides
Structural schematic diagram.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Referring to Fig. 1, Fig. 1 is a kind of structure for isolation bidirectional DC-DC converter that an embodiment of the present invention provides
Schematic diagram, for ease of description, only the parts related to this embodiment are shown, and details are as follows:
A kind of isolation bidirectional DC-DC converter, including high voltage protective module 11, voltage regulating module 12, DC-DC isolated variable mould
Block 10 and low-voltage variation module 13.
High voltage protective module 11 is for protecting the first primary voltage and the second target voltage.
Voltage regulating module 12 is connect with high voltage protective module 11, for former to first after the protection of high voltage protective module 11
Beginning voltage carries out pressure regulation to generate one or more first voltage, and to one or more second voltage carry out pressure regulation with
Generate the second target voltage.
DC-DC isolated variable module 10 is connect with voltage regulating module 12, inverse for carrying out to one or more first voltage
Become rectification to generate one or more first target voltage, and original to second after the protection of low-voltage variation module 13
Voltage carries out inversion rectification to generate one or more second voltage.
Low-voltage variation module 13 is connect with DC-DC isolated variable module 10, for original to first target voltage and second
Voltage is protected.
The utility model embodiment protects on high-tension side circuit by high voltage protective module, passes through voltage regulating module tune
Voltage is saved, fair current decompression and adverse current boosting inverter are carried out to voltage by DC-DC isolated variable module, pass through low-voltage variation module
The circuit of low-pressure side is protected, isolation bidirectional DC-DC converter fair current decompression mode and adverse current boost mode may be implemented
Seamless switching, Sofe Switch control can reduce switching loss, improves the efficiency of isolation bidirectional DC-DC converter, save energy
Source, and the isolation bidirectional DC-DC converter may be implemented in wide scope, high voltage (such as up to 1500V and above voltage) condition
Lower work.
Referring to Fig. 2, in an embodiment of the utility model, voltage regulating module 12 includes one or more pressure regulation units 121.
Pressure regulation unit 121 is used for the first primary voltage after protecting to high voltage protective module 11 and carries out pressure regulation to generate first
Voltage, and pressure regulation is carried out to generate the second target voltage to second voltage.
In specific implementation, referring to Fig. 3, Fig. 3 is a kind of exemplary circuit schematic diagram of pressure regulation unit 121.Pressure regulation unit 121
Including first capacitor C1, the second capacitor C2, the first field-effect tube Q1A, the second field-effect tube Q2A, third field-effect tube Q1B,
Four field-effect tube Q2B, the first inductance L1A, the second inductance L1B and third capacitor C3.
The first end of first capacitor C1 is connect with the drain electrode of the first field-effect tube Q1A, the second end of first capacitor C1 and the
The first end of two capacitor C2 connects.
The source electrode of first field-effect tube Q1A is connect with the drain electrode of third field-effect tube Q1B, the source of third field-effect tube Q1B
Pole is connect with the second end of the drain electrode of the 4th field-effect tube Q2B and first capacitor C1, the source electrode and second of the 4th field-effect tube Q2B
The drain electrode of field-effect tube Q2A connects, and the source electrode of the second field-effect tube Q2A is connect with the second end of the second capacitor C2.
The first end of first inductance L1A is connect with the drain electrode of third field-effect tube Q1B, the second end of the first inductance L1A with
The first end of third capacitor C3 connects, and the second end of third capacitor C3 is connect with the first end of the second inductance L1B, the second inductance
The second end of L1B is connect with the source electrode of the 4th field-effect tube Q2B.
The first end of first capacitor C1 and the second end of the second capacitor C2 collectively form as the first original of pressure regulation unit 121
Second target voltage output end of voltage input end and pressure regulation unit 121.
The first end of third capacitor C3 and the second end of third capacitor C3 collectively form as the first voltage of pressure regulation unit 121
The second voltage input terminal of output end and pressure regulation unit 121.
A kind of way of realization of pressure regulation unit 121 is using three Level Technologies, is one three electricity in fair current decompression mode
Flat BUCK circuit (reduction voltage circuit that a kind of output voltage is less than input voltage), first capacitor C1, the second capacitor C2 are two points
Voltage capacitance, capacitance is very big and equal, therefore the voltage loaded on two derided capacitors is the one of input voltage vin
Half.Control is controlled using pulse-width signal PWM, and the first field-effect tube Q1A and the second field-effect tube Q2A are as two main switches
Pipe, third field-effect tube Q1B and the 4th field-effect tube Q2B are as continued flow switch pipe, the first inductance L1A and the second inductance L1B
Filter inductance, third capacitor C3 is filter capacitor.First field-effect tube Q1A and the second field-effect tube Q2A staggeredly works, driving
Signal phase differs 180 °, the first field-effect tube Q1A and third field-effect tube Q1B complementary duty and retains certain dead zone, the
Two field-effect tube Q2A and the 4th field-effect tube Q2B also complementary duty and retain certain dead zone.
In specific implementation, bidirectional DC-DC converter accounting in the first field-effect tube Q1A and the second field-effect tube Q2A is isolated
Sky ratio D has different operating modes when being more than or less than 0.5.
Referring to Fig. 4, Fig. 4 is the duty ratio of the first field-effect tube Q1A and the second field-effect tube Q2A under fair current decompression mode
The key operation waveforms figure of D >=0.5, wherein bidirectional DC-DC converter, which is isolated, in a switch periods 8 switch mode:
1) mode 1 is switched, time interval is [t0, t1], and the first field-effect tube Q1A and the second field-effect tube Q2A are led simultaneously
Logical such as Fig. 4 (i) is shown, AB point-to-point transmission voltage VAB=Vin.Voltage on third field-effect tube Q1B and the 4th field-effect tube Q2B
It is Vin/2, the electric current on the first inductance L1A and the second inductance L1B is linearly increasing.
2) mode 2 is switched, time interval is [t1, t2], and t1 moment the second field-effect tube Q2A shutdown such as Fig. 4 (ii) is shown,
Electric current flows through the body diode of the 4th field-effect tube Q2B.VAB=Vin/2, third field-effect tube Q1B and the second field-effect tube Q2A
On voltage be Vin/2, the electric current linear decline on the first inductance L1A and the second inductance L1B.
3) mode 3 is switched, time interval is [t2, t3], and the 4th field-effect tube Q2B of t2 moment is opened as shown in Fig. 4 (ii),
4th field-effect tube Q2B no-voltage is open-minded, VAB=Vin/2, the voltage on third field-effect tube Q1B and the second field-effect tube Q2A
It is Vin/2, the electric current on the first inductance L1A and the second inductance L1B continues linear decline.
4) mode 4 is switched, time interval is [t3, t4], and the 4th field-effect tube Q2B of t3 moment shutdown such as Fig. 4 (ii) is shown,
4th field-effect tube Q2B zero voltage turn-off, the voltage on VAB=Vin/2, third field-effect tube Q1B and the second field-effect tube Q2A
It is Vin/2, the electric current on the first inductance L1A and the second inductance L1B continues linear decline.
5) mode 5 is switched, time interval is [t4, t5], and the t4 moment, the second field-effect tube Q2A was opened again such as Fig. 4 (i) institute
Show, VAB=Vin, the voltage on third field-effect tube Q1B and the 4th field-effect tube Q2B is Vin/2, the first inductance L1A and
Electric current on two inductance L1B linear rise again.
6) mode 6 is switched, time interval is [t5, t6], and t5 moment the first field-effect Q1A shutdown such as Fig. 4 (iii) is shown,
Electric current flows through the body diode of third field-effect tube Q1B, VAB=Vin/2, the first field-effect tube Q1A and the 4th field-effect tube Q2B
On voltage be Vin/2, the linear decline again of the electric current on the first inductance L1A and the second inductance L1B.
7) mode 7 is switched, time interval is [t6, t7], and t6 moment third field-effect tube Q1B is opened such as Fig. 4 (iii) institute
Show, third field-effect tube Q1B no-voltage is open-minded, VAB=Vin/2, on the first field-effect tube Q1A and the 4th field-effect tube Q2B
Voltage is Vin/2, and the electric current on the first inductance L1A and the second inductance L1B continues linear decline.
8) mode 8 is switched, time interval is [t7, t8], and t7 moment third field-effect tube Q1B is turned off such as Fig. 4 (iii) institute
Show, third field-effect tube Q1B zero voltage turn-off, VAB=Vin/2, on the first field-effect tube Q1A and the 4th field-effect tube Q2B
Voltage is Vin/2, and the electric current on the first inductance L1A and the second inductance L1B continues linear decline.
Equation is obtained according to the voltage-second balance of the first inductance L1A or the second inductance L1B:
It can be concluded that duty cycle relationship after simplificationWherein, Vin is the input voltage of pressure regulation unit 121, and Vo is
The output voltage of pressure regulation unit 121.
Referring to Fig. 5, Fig. 5 is the duty ratio of the first field-effect tube Q1A and the second field-effect tube Q2A under fair current decompression mode
The key operation waveforms figure of D < 0.5, wherein bidirectional DC-DC converter, which is isolated, in a switch periods also 8 switching moldings
State:
1) mode 1 is switched, time interval is [t0, t1], and the first field-effect tube Q1A and the 4th field-effect tube Q2B are led simultaneously
Logical such as Fig. 5 (i) is shown, the electricity on AB point-to-point transmission voltage VAB=Vin/2, third field-effect tube Q1B and the second field-effect tube Q2A
Pressure is Vin/2, and the electric current on the first inductance L1A and the second inductance L1B is linearly increasing.
2) mode 2 is switched, time interval is [t1, t2], and t1 moment the first field-effect tube Q1A shutdown such as Fig. 5 (ii) is shown,
Electric current flows through the body diode of third field-effect tube Q1B, VAB=0, on the first field-effect tube Q1A and the second field-effect tube Q2A
Voltage is Vin/2, the electric current linear decline on the first inductance L1A and the second inductance L1B.
3) mode 3 is switched, time interval is [t2, t3], and t2 moment third field-effect tube Q1B is opened as shown in Fig. 5 (ii),
Third field-effect tube Q1B no-voltage is open-minded, VAB=0, and the voltage on the first field-effect tube Q1A and the second field-effect tube Q2A is
Electric current on Vin/2, the first inductance L1A and the second inductance L1B continues linear decline.
4) mode 4 is switched, time interval is [t3, t4], and the 4th field-effect tube Q2B of t3 moment shutdown such as Fig. 5 (ii) is shown,
4th field-effect tube Q2B zero voltage turn-off, VAB=0, the voltage on the first field-effect tube Q1A and the second field-effect tube Q2A are
Electric current on Vin/2, the first inductance L1A and the second inductance L1B continues linear decline.
5) mode 5 is switched, time interval is [t4, t5], and t4 moment the second field-effect tube Q2A is opened such as Fig. 5 (iii) institute
Show.Voltage on VAB=Vin/2, the first field-effect tube Q1A and the 4th field-effect tube Q2B is Vin/2, the first inductance L1A and
Electric current on second inductance L1B linear rise again.
6) mode 6 is switched, time interval is [t5, t6], and t5 moment the second field-effect tube Q2A shutdown such as Fig. 5 (ii) is shown,
Electric current flows through the body diode of the 4th field-effect tube Q2B, VAB=0, on the first field-effect tube Q1A and the second field-effect tube Q2A
Voltage is Vin/2, the linear decline again of the electric current on the first inductance L1A and the second inductance L1B.
7) mode 7 is switched, time interval is [t6, t7], and the 4th field-effect tube Q2B of t6 moment is opened as shown in Fig. 5 (ii),
4th field-effect tube Q2B no-voltage is open-minded, VAB=0, and the voltage on the first field-effect tube Q1A and the second field-effect tube Q2A is
Electric current on Vin/2, the first inductance L1A and the second inductance L1B continues linear decline.
8) mode 8 is switched, time interval is [t7, t8], and t7 moment third field-effect tube Q1B shutdown such as Fig. 5 (ii) is shown,
Third field-effect tube Q1B zero voltage turn-off, VAB=0, the voltage on the first field-effect tube Q1A and the second field-effect tube Q2A are
Electric current on Vin/2, the first inductance L1A and the second inductance L1B continues linear decline.
Also according to the voltage-second balance equation of the first inductance L1A or the second inductance L1B:
It can be concluded that same duty cycle relationship after simplification:Wherein, Vin is the input electricity of pressure regulation unit 121
Pressure, Vo are the output voltage of pressure regulation unit 121.
The duty cycle relationship formula derived from above it can be concluded that, the size of duty ratio D is solely dependent upon pressure regulation unit 121
Input voltage and output voltage, it is unrelated with whether duty ratio is greater than 50%, therefore be adapted to wide scope operating voltage and carry out height
Imitate pressure regulation.And due to the first field-effect tube Q1A and third field-effect tube Q1B, the second field-effect tube Q2A and the 4th field-effect tube
Q2B complementary duty always, so that three level BUCK circuits will not enter discontinuous mode, inductance electricity under idle condition
Flowing continuous always namely three level BUCK circuits under any input, output and loading condition is all to set up.
In addition, by the key operation waveforms figure of duty ratio D >=0.5 under fair current decompression mode and duty ratio D < 0.5 and one
8 switch model analyses of isolation bidirectional DC-DC converter in a switch periods, it is known that all effects in pressure regulation unit 121
The shutdown voltage for answering tube device to bear only has the half of the first primary voltage.Voltage stress, which halves, has just greatly widened device
The SIC MOSFET element of the range of selection, 900V, 1000V of current main-stream can be selected, to reduce raw material (first device
Part) cost and procurement risk, and fully meet IPC9592 and answer force request.Voltage stress, which halves, simultaneously also greatly reduces
Switching loss and resulting electromagnetic interference problem.
And under adverse current boost mode, it is only that the input terminal and output end of pressure regulation unit 121 are overturned mutually, pressure regulation unit
121 adverse current boost mode is actually three level BOOST circuits (booster circuit that a kind of output voltage is greater than input voltage),
So if the voltage of high-voltage end is uniformly set as VH, the voltage of low-pressure end is set as VL, then three level BUCK and three level BOOST
Duty cycle relationship can becomeWithIt can be seen that the two duty ratio formula are exactly complementation, so pressure regulation
Unit 121 fair current decompression and adverse current boosting both of which operation when open up benefit structure it is identical, operation logic is also full symmetric, energy
Dynamic equilibrium can be flowed and realized with automatic bidirectional, and seamless switching may be implemented in fair current decompression and adverse current boosting both of which
And control is simple.Similarly, under adverse current boost mode, the shutdown that all field-effect tube devices in pressure regulation unit 121 are born is electric
Pressure is also the half of the second target voltage.Voltage stress halves the range for just greatly having widened device selection to reduce original
The cost and procurement risk for expecting (component), considerably reduce switching loss and resulting electromagnetic interference problem.
Referring to Fig. 6, in an embodiment of the utility model, pressure regulation unit 121 includes the 4th capacitor C4, the 5th capacitor
C5, the 6th capacitor C6, the 7th capacitor C7, third inductance L3, the 5th field-effect tube Q5, the 6th field-effect tube Q6, the 7th field-effect
Pipe Q7 and the 8th field-effect tube Q8.
The first end of 4th capacitor C4 is connect with the drain electrode of the 5th field-effect tube Q5, the second end and the 5th of the 4th capacitor C4
The first end of capacitor C5 connects.
The source electrode of 5th field-effect tube Q5 is connect with the first end of the drain electrode of the 7th field-effect tube Q7 and third inductance L3, the
The source electrode of seven field-effect tube Q7 is connect with the first end of the 6th capacitor C6, and the of the second end of the 6th capacitor C6 and the 7th capacitor C7
One end is connected with the second end of the 4th capacitor C4.
The second end of 7th capacitor C7 is connect with the drain electrode of the 8th field-effect tube Q8, the source electrode of the 8th field-effect tube Q8 and
The second end of three inductance L3 is connected with the drain electrode of the 6th field-effect tube Q6, the source electrode of the 6th field-effect tube Q6 and the 5th capacitor C5's
Second end connection.
The first end of 4th capacitor C4 and the second end of the 5th capacitor C5 collectively form as the first original of pressure regulation unit 121
Second target voltage output end of voltage input end and pressure regulation unit 121.
The first end of 6th capacitor C6 and the second end of the 7th capacitor C7 collectively form as the first voltage of pressure regulation unit 121
The second voltage input terminal of output end and pressure regulation unit 121.
The circuit is also three level BUCK-BOOST circuits, the function of bidirectional modulation voltage equally may be implemented, so that high
The voltage stress of the pressure all field-effect tube in side only has the half of the first primary voltage of high-pressure side or the second target voltage, greatly
The range for having widened device selection, to reduce the cost and procurement risk of raw material (component), and fully meets IPC9592 and answers
Force request.Voltage stress, which halves, simultaneously also greatly reduces switching loss and resulting electromagnetic interference problem.Equally,
The duty ratio D of the pressure regulation unit 121 is adjustable between 0 to 100%, so that high-pressure side and low-pressure side are suitable for wide scope work
Voltage, and it is suitable for different application scenarios.
Referring to Fig. 7, in an embodiment of the utility model, DC-DC isolated variable module 10 includes and multiple pressure regulation lists
First 121 corresponding DC-DC converter units 01, wherein DC-DC converter unit 01 is converted including one or more DC-DC
Subelement 100.
Super high power single module design is realized using multiphase interleaving, it can be integrated using magnetic between multiphase filtering inductance
Technology (it refers to for two or more discrete devices in converter, such as inductance, transformer being wound on a secondary magnetic core, from
Concentrated in together in structure), it realizes that the ripple of high pressure lateral circuit and lower-voltage circuit is offset, ripple current is reduced, to reduce
The volume of filter reduces the current stress of filter capacitor, extends the service life of filter capacitor, and lesser filter can be used
Wave inductance promotes dynamic response characteristic.Using phase administrative skill, under different loading conditions, a phase or more can be turned off
Phase can only allow a phase to work to reduce power loss, and lifting system efficiency under idle condition, realize it is minimum to
Machine power consumption and no-load loss.Sharing general power by multiple modules makes components selection simple, and bidirectional DC-DC converter is isolated
Device has better heat management, its reliability of significant increase.Meanwhile isolation bidirectional DC-DC converter can be in fair current decompression mode
The seamless switching between adverse current boost mode, without the conversion of control model.
Referring to Fig. 8, in an embodiment of the utility model, it includes inversion rectification unit that DC-DC, which converts subelement 100,
101, transformation resonant element 102 and commutation inversion unit 103.
Inversion rectification unit 101 is for carrying out inversion to the first voltage of direct current when fair current decompression work to generate exchange
Tertiary voltage countercurrently rectifies to generate the second voltage of direct current the 6th voltage of exchange when boosting work.
Transformation resonant element 102 is connect with commutation inversion unit 101, for three voltages of exchange carry out voltage conversion and
Resonance carries out voltage conversion to the 5th voltage of exchange and generates the exchanged with resonance to generate the 4th voltage of exchange
Six voltages.
Commutation inversion unit 103 is connect with transformation resonant element 102, for fair current be depressured work when to the 4th of exchange
Voltage is rectified to generate the first target voltage of direct current, and is protected when adverse current boosts work to low-voltage variation module 13
The second primary voltage afterwards carries out inversion to generate the 5th voltage of exchange.
The control that DC-DC converts subelement 100 is simple, and concurrent-countercurrent mode can be thus achieved without the conversion of control model
Seamless switching.
Referring to Fig. 9, in an embodiment of the utility model, inversion rectification unit 101 include the 9th field-effect tube Q3A,
Tenth field-effect tube Q4A, the 11st field-effect tube Q3B and the 12nd field-effect tube Q4B.
The drain electrode of 9th field-effect tube Q3A and the source electrode of the 12nd field-effect tube Q4B collectively form as inversion rectification unit
101 first voltage input terminal and the second voltage output end of inversion rectification unit 101.
The drain electrode of 9th field-effect tube Q3A is connect with the drain electrode of the tenth field-effect tube Q4A, the source of the 9th field-effect tube Q3A
Pole is connect with the drain electrode of the 12nd field-effect tube Q4B.
The source electrode of 12nd field-effect tube Q4B is connect with the source electrode of the 11st field-effect tube Q3B.
The drain electrode of 11st field-effect tube Q3B is connect with the source electrode of the tenth field-effect tube Q4A.
The source electrode of 9th field-effect tube Q3A and the source electrode of the tenth field-effect tube Q4A collectively form as inversion rectification unit 101
Tertiary voltage output end and inversion rectification unit 101 the 6th voltage input end.
9th field-effect tube Q3A, the tenth field-effect tube Q4A, the 11st field-effect tube Q3B and the 12nd field-effect tube
Q4B collectively forms DC-AC full-bridge circuit.Vin is DC voltage, the 9th field-effect tube Q3A, the 12nd field-effect tube Q4B,
Tenth field-effect tube Q4A, the 11st field-effect tube Q3B are controlled tr tube.When the 9th field-effect tube Q3A and the 11st field-effect
When pipe Q3B conducting, the 12nd field-effect tube Q4B and the tenth field-effect tube Q4A are disconnected, the source terminal electricity of the 9th field-effect tube Q3A
Pressure is positive, and the source voltage of the tenth field-effect tube Q4A is negative；Conversely, when the 12nd field-effect tube Q4B and the tenth field-effect tube
When Q4A conducting and the 9th field-effect tube Q3A and the 11st field-effect tube Q3B are disconnected, the source terminal voltage of the 9th field-effect tube Q3A
It is negative, the source voltage of the tenth field-effect tube Q4A is positive, to realize the work that the voltage of direct current is reverse into the voltage of exchange
With.
Referring to Fig. 9, in an embodiment of the utility model, transformation resonant element 102 includes the first transformer T1, the 4th
Inductance L4, the 5th inductance L5 and the 8th capacitor C8.
The second end of the first end of 4th inductance L4 and the primary side winding of the first transformer T1 collectively forms as transformation resonance
The tertiary voltage input terminal of unit 102 and the 6th voltage output end of transformation resonant element 102.
The second end of 4th inductance L4 is connect with the first end of the 8th capacitor C8, and the second end of the 8th capacitor C8 becomes with first
The first end of the primary side winding of depressor T1 is connected with the first end of the 5th inductance L5, the second end and the first transformation of the 5th inductance L5
The second end of the primary side winding of device T1 connects.
The common structure of second end of the vice-side winding of the first end of the vice-side winding of first transformer T1 and the first transformer T1
As the 4th voltage output end of transformation resonant element 102 and the 5th voltage input end of transformation resonant element 102.
Under fair current decompression mode, the first transformer T1 carries out transformation to tertiary voltage and resonance is handled, corresponding to generate the 4th
Voltage；The first transformer T1 carries out transformation and resonance processing the 6th voltage of corresponding generation to the 5th voltage under adverse current boost mode.
Inversion rectification unit 101, transformation resonant element 102 and commutation inversion unit 103 combine filtering mould under fair current operating mode
Block 18 constitutes LLC full-bridge resonance isolation bidirectional DC-DC converter, wherein the 4th inductance L4 and the 5th inductance L5 and the
Eight capacitor C8 form resonant network, can carry out resonance processing to tertiary voltage and the 4th voltage.
101 and of commutation inversion unit 103, transformation resonant element 102 and inversion rectification unit under adverse current operating mode
Filter capacitor C11 (or 1 LC full-bridge resonance bidirectional DC-DC converter is constituted with the third capacitor C3 in pressure regulation unit 121)
Device, the 4th inductance L4 and the 8th capacitor C8 constitute resonant network at this time, carry out resonance processing to the 5th voltage and the 6th voltage.
Referring to Fig. 9, in an embodiment of the utility model, commutation inversion unit 103 includes the 13rd field-effect tube
Q5A, the 14th field-effect tube Q6A, the 15th field-effect tube Q5B and the 16th field-effect tube Q6B.
The source electrode of 13rd field-effect tube Q5A is connect with the drain electrode of the 16th field-effect tube Q6B, the 13rd field-effect tube
The drain electrode of Q5A is connect with the drain electrode of the 14th field-effect tube Q6A.
The drain electrode connection of the source electrode and the 15th field-effect tube Q5B of 14th field-effect tube Q6A, the 15th field-effect tube
The source electrode of Q5B is connect with the source electrode of the 16th field-effect tube Q6B.
The drain electrode of the source electrode and the 15th field-effect tube Q5B of 13rd field-effect tube Q5A collectively forms as commutation inversion list
First 103 the 4th voltage input end and the 5th voltage output end of commutation inversion unit 103.
The drain electrode of 14th field-effect tube Q6A and the source electrode of the 15th field-effect tube Q5B collectively form as commutation inversion list
First 103 first target voltage output end and the second primary voltage input terminal of commutation inversion unit 103.
13rd field-effect tube Q5A, the 14th field-effect tube Q6A, the 15th field-effect tube Q5B and the 16th field-effect
Pipe Q6B constitutes rectifier bridge.When 16th field-effect tube Q6B and the 14th field-effect tube Q6A is connected, the 13rd field-effect tube Q5A
It is closed with the 15th field-effect tube Q5B, the source electrode of the 15th field-effect tube Q5B and the source electrode of the 16th field-effect tube Q6B are common
It is configured to positive polarity output terminal, the drain electrode of the 14th field-effect tube Q6A of drain electrode of the 13rd field-effect tube Q5A, which collectively forms, to be negative
Polarity output terminal；Conversely, similarly analyzing.Therefore, it can be achieved that being rectified under fair current decompression mode to the 4th voltage of exchange
To generate the first target voltage of direct current, to meet application demand.
And under adverse current boost mode, since commutation inversion unit 103 and inversion rectification unit 101 are symmetrical structures,
Therefore the inversion working principle of analogy inversion rectification unit 101 is analyzed it is found that commutation inversion unit 103 may be implemented to low
The second primary voltage after pressure polarity protection module 131 is protected carries out the 5th voltage for being reverse into exchange.Inversion rectification unit 101
6th voltage of exchange can also be rectified to generate the second voltage of direct current.
It, can be by the way that a filtering mould be arranged after commutation inversion unit 103 under fair current decompression mode in specific implementation
Block 18, optionally, filter module 18 include filter capacitor.One filter capacitor C10 of parallel connection after commutation inversion unit 103,
The first target voltage exported to commutation inversion unit 103 is filtered, and eliminates noise jamming, and to input rectifying inversion list
Second primary voltage of member 103 is filtered noise reduction, improves the conversion quality and transfer efficiency of commutation inversion unit 103.
In the utility model embodiment, pass through the 9th field-effect tube Q3A, the 11st field-effect tube Q3B, the 13rd field-effect
The frequency of pipe Q5A and the 15th field-effect tube Q5B fix and with the same pulse widths of frequency.Tenth field-effect tube Q4A, the 12nd
The frequency of field-effect tube Q4B, the 14th field-effect tube Q6A and the 16th field-effect tube Q6B are also fixed and wide with pulse with frequency
Degree, and with the 9th field-effect tube Q3A, the 11st field-effect tube Q3B, the 13rd field-effect tube Q5A and the 15th field-effect tube
Q5B keeps certain dead zone, so that being able to achieve Sofe Switch when isolation bidirectional DC-DC converter both forward and reverse directions work, controls plan
It is slightly simple, it is easy to accomplish.
Referring to Fig. 10, in an embodiment of the utility model, transformation resonant element 102 includes the second transformer T2, the
Six inductance L6, the 7th inductance L7, the 8th inductance L8 and the 9th capacitor C9.
The first end of 6th inductance L6 and the second end of the 6th inductance L6 collectively form as the third of transformation resonant element 102
6th voltage output end of voltage input end and transformation resonant element 102.
The first end of 6th inductance L6 is connect with the first end of the 7th inductance L7, the second end of the 7th inductance L7 and the 9th electricity
Hold the first end connection of C9, the primary side of the second end of the 9th capacitor C9 and the first end of the 8th inductance L8 and the second transformer T2 around
The first end connection of group, the primary side winding of the second end of the 6th inductance L6 and the second end of the 8th inductance L8 and the second transformer T2
Second end connection.
The common structure of second end of the vice-side winding of the first end of the vice-side winding of second transformer T2 and the second transformer T2
As the 4th voltage output end of transformation resonant element 102 and the 5th voltage input end of transformation resonant element 102.
The present embodiment can make fair current decompression and adverse current boost mode all constitute LLC resonant converter, and two-way DC- is isolated
D converter has bidirectionally symmetric structure, and certain voltage change range can be adapted to using variable frequency work pattern.
Figure 11 is please referred to, in one embodiment, high voltage protective module 11 includes high voltage fault protective module 111, high pressure wave
Gush protective module 112 and high pressure polarity protective module 113.
High voltage fault protective module 111 is connect with the first primary voltage, for the first primary voltage or the second target electricity
Pressure carries out overvoltage protection.
High voltage surge protective module 112 is connect with high voltage fault protective module 111, for protecting mould to by high voltage fault
The transient current peak value of the first primary voltage after the protection of block 111 and the transient current peak of the second target voltage after polarity protection
Value is inhibited.
High pressure polarity protective module 113 is connect with high voltage surge protective module 112, for after protecting to high voltage surge
One primary voltage and the second target voltage carry out polarity protection.
In specific implementation, high voltage protective module 11 can also include EMC (Electro Magnetic
Compatibility, Electro Magnetic Compatibility) circuit, this depends on the EMC calling hierarchy of actual product.
The present embodiment can prevent that over-voltage/failure from occurring in high-pressure side or transient voltage is excessive or polarity of voltage mutually instead
Circuit is damaged.
Figure 12 is please referred to, in one embodiment, low-voltage variation module 13 includes low pressure polarity protection module 131 and low pressure wave
Gush failure protection module 132.
Low pressure polarity protection module 131 is used for original to first target voltage and by surge and second after error protection
Voltage carries out polarity protection.
Low pressure surge failure protection module 132 is connect with low pressure polarity protection module 131, for protecting to by low pressure polarity
It protects the first target voltage after module 131 is protected and the second primary voltage carries out overvoltage protection and to by low pressure polarity protection
The transient current peak value of first target voltage after 131 module protections and the transient current peak value of the second primary voltage are pressed down
System.
In specific implementation, low-voltage variation module 13 can also include EMC circuit, this depends on the EMC requirement of actual product
Grade.
The present embodiment can prevent that over-voltage/failure from occurring in low-pressure side or transient voltage is excessive or polarity of voltage mutually instead
Circuit is damaged.
In conclusion a kind of isolation bidirectional DC-DC converter provided by the embodiment of the utility model, passes through high voltage protective mould
Block protects on high-tension side circuit, adjusts voltage by voltage regulating module, is carried out by DC-DC isolated variable module to voltage
Fair current decompression and adverse current boosting are adjusted, and are protected by circuit of the low-voltage variation module to low-pressure side, it is double that isolation may be implemented
To the seamless switching of DC-DC converter fair current decompression mode and adverse current boost mode, Sofe Switch control can reduce switch damage
Consumption improves the efficiency of isolation bidirectional DC-DC converter, energy saving, and the isolation bidirectional DC-DC converter may be implemented in wide model
It encloses, work under the conditions of high voltage (such as voltage of up to 1500V or more).
Throughout the specification to " various embodiments ", " in embodiments ", " embodiment " or " embodiment party
The reference of formula " etc., which is meant, is included at least one embodiment about a particular feature, structure, or characteristic described in embodiment
In.Therefore, phrase " in various embodiments ", " in some embodiments ", " in one embodiment " or " implementing
In mode " etc. the appearance in appropriate place throughout the specification be not necessarily all referring to same embodiment.Although above with certain
A the level of detail describes certain embodiments, but those of skill in the art can make very disclosed embodiment
It is changeable more without departing from the scope of the present disclosure." such as " use throughout the specification should be widely interpreted and for providing
The non-limitative example of embodiment of the present disclosure, and the present disclosure is not limited to such examples.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all practical at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the guarantor of the utility model within novel spirit and principle
Within the scope of shield.
Claims (11)
1. a kind of isolation bidirectional DC-DC converter characterized by comprising
High voltage protective module for being protected to the first primary voltage and the second target voltage；
It is connect with the high voltage protective module, for first primary voltage after the high voltage protective module protection
Pressure regulation is carried out to generate one or more first voltage, and pressure regulation is carried out to generate to one or more second voltage
State the voltage regulating module of the second target voltage；
Connect with the voltage regulating module, for carrying out inversion rectification one or more described first voltage with generate one or
The multiple first target voltage of person, and inversion is carried out to the second primary voltage after low-voltage variation module protection and is rectified with life
At the DC-DC isolated variable module of second voltage described in one or more；
The low-voltage variation module is connect with the DC-DC isolated variable module, for the first target voltage and described
Second primary voltage is protected.
2. a kind of isolation bidirectional DC-DC converter as described in claim 1, which is characterized in that the voltage regulating module includes one
A or multiple pressure regulation units；
The pressure regulation unit is used to carry out pressure regulation to first primary voltage after the high voltage protective module protection to generate
The first voltage, and pressure regulation is carried out to generate second target voltage to the second voltage.
3. a kind of isolation bidirectional DC-DC converter as claimed in claim 2, which is characterized in that the pressure regulation unit includes the
One capacitor, the second capacitor, the first field-effect tube, the second field-effect tube, third field-effect tube, the 4th field-effect tube, the first inductance,
Second inductance and third capacitor；
The first end of the first capacitor is connect with the drain electrode of first field-effect tube, the second end of the first capacitor and institute
State the first end connection of the second capacitor；
The source electrode of first field-effect tube is connect with the drain electrode of the third field-effect tube, the source electrode of the third field-effect tube
It is connect with the second end of the drain electrode of the 4th field-effect tube and the first capacitor, the source electrode of the 4th field-effect tube and institute
The drain electrode connection of the second field-effect tube is stated, the source electrode of second field-effect tube is connect with the second end of second capacitor；
The first end of first inductance is connect with the drain electrode of the third field-effect tube, the second end of first inductance and institute
The first end connection of third capacitor is stated, the second end of the third capacitor connect with the first end of second inductance, and described the
The second end of two inductance is connect with the source electrode of the 4th field-effect tube；
The first original that the first end of the first capacitor and the second end of second capacitor collectively form as the pressure regulation unit
Second target voltage output end of beginning voltage input end and the pressure regulation unit；
The first electricity that the first end of the third capacitor and the second end of the third capacitor collectively form as the pressure regulation unit
Press the second voltage input terminal of output end and the pressure regulation unit.
4. a kind of isolation bidirectional DC-DC converter as claimed in claim 2, which is characterized in that the pressure regulation unit includes the
Four capacitors, the 5th capacitor, the 6th capacitor, the 7th capacitor, third inductance, the 5th field-effect tube, the 6th field-effect tube, the 7th effect
It should manage and the 8th field-effect tube；
The first end of 4th capacitor is connect with the drain electrode of the 5th field-effect tube, the second end of the 4th capacitor and institute
State the first end connection of the 5th capacitor；
The source electrode of 5th field-effect tube is connect with the first end of the drain electrode of the 7th field-effect tube and the third inductance,
The source electrode of 7th field-effect tube is connect with the first end of the 6th capacitor, the second end of the 6th capacitor and described the
The first end of seven capacitors is connected with the second end of the 4th capacitor；
The second end of 7th capacitor is connect with the drain electrode of the 8th field-effect tube, the source electrode of the 8th field-effect tube with
The second end of the third inductance is connected with the drain electrode of the 6th field-effect tube, the source electrode of the 6th field-effect tube with it is described
The second end of 5th capacitor connects；
The first original that the first end of 4th capacitor and the second end of the 5th capacitor collectively form as the pressure regulation unit
Second target voltage output end of beginning voltage input end and the pressure regulation unit；
The first electricity that the first end of 6th capacitor and the second end of the 7th capacitor collectively form as the pressure regulation unit
Press the second voltage input terminal of output end and the pressure regulation unit.
5. a kind of isolation bidirectional DC-DC converter as claimed in claim 2, which is characterized in that the DC-DC isolated variable mould
Block includes and the corresponding DC-DC converter unit of multiple pressure regulation units；Wherein, DC-DC converter unit is including one or more
A DC-DC converts subelement；
The DC-DC converts subelement
Inversion is carried out to the first voltage of direct current to generate the tertiary voltage of exchange when being depressured work for fair current, adverse current rises
The 6th voltage of exchange is rectified to generate the inversion rectification unit of the second voltage of direct current when pressing work；
It connect with the inversion rectification unit, is handed over for carrying out voltage conversion and resonance to the tertiary voltage of exchange with generating
4th voltage of stream, and voltage conversion is carried out to the 5th voltage of exchange and generates the 6th voltage exchanged with resonance
Transformation resonant element；
Connect with the transformation resonant element, for fair current be depressured work when to the 4th voltage of exchange rectified with
Generate direct current the first target voltage, and adverse current boost work when to the low-voltage variation module protection after described in
Second primary voltage carries out inversion to generate the commutation inversion unit of the 5th voltage of exchange.
6. a kind of isolation bidirectional DC-DC converter as claimed in claim 5, which is characterized in that the commutation inversion unit packet
Include the 9th field-effect tube, the tenth field-effect tube, the 11st field-effect tube and the 12nd field-effect tube；
The drain electrode of 9th field-effect tube and the source electrode of the 12nd field-effect tube collectively form as the commutation inversion list
The first voltage input terminal of member and the second voltage output end of the commutation inversion unit；
The drain electrode of 9th field-effect tube is connect with the drain electrode of the tenth field-effect tube, the source electrode of the 9th field-effect tube
It is connect with the drain electrode of the 12nd field-effect tube；
The source electrode of 12nd field-effect tube is connect with the source electrode of the 11st field-effect tube；
The drain electrode of 11st field-effect tube is connect with the source electrode of the tenth field-effect tube；
The source electrode of 9th field-effect tube and the source electrode of the tenth field-effect tube collectively form as the commutation inversion unit
Tertiary voltage output end and the commutation inversion unit the 6th voltage input end.
7. a kind of isolation bidirectional DC-DC converter as claimed in claim 6, which is characterized in that the transformation resonant element packet
Include the first transformer, the 4th inductance, the 5th inductance and the 8th capacitor；
The second end of the primary side winding of the first end and first transformer of 4th inductance collectively forms as the transformation
6th voltage output end of the tertiary voltage input terminal of resonant element and the transformation resonant element；
The second end of 4th inductance is connect with the first end of the 8th capacitor, the second end of the 8th capacitor with it is described
The first end of the primary side winding of first transformer is connected with the first end of the 5th inductance, the second end of the 5th inductance with
The second end of the primary side winding of first transformer connects；
The common structure of second end of the vice-side winding of the first end of the vice-side winding of first transformer and first transformer
As the 4th voltage output end of the transformation resonant element and the 5th voltage input end of the transformation resonant element.
8. a kind of isolation bidirectional DC-DC converter as claimed in claim 6, which is characterized in that the transformation resonant element packet
Include the second transformer, the 6th inductance, the 7th inductance, the 8th inductance and the 9th capacitor；
It is the of the transformation resonant element that the first end of 6th inductance and the second end of the 6th inductance, which collectively form,
6th voltage output end of three voltage input ends and the transformation resonant element；
The first end of 6th inductance is connect with the first end of the 7th inductance, the second end of the 7th inductance with it is described
The first end of 9th capacitor connects, the second end of the 9th capacitor and the first end and second transformation of the 8th inductance
The first end of the primary side winding of device connects, the second end of the 6th inductance and the second end and described second of the 8th inductance
The second end of the primary side winding of transformer connects；
The common structure of second end of the vice-side winding of the first end of the vice-side winding of second transformer and second transformer
As the 4th voltage output end of the transformation resonant element and the 5th voltage input end of the transformation resonant element.
9. a kind of isolation bidirectional DC-DC converter as claimed in claim 7 or 8, which is characterized in that the commutation inversion unit
Including the 13rd field-effect tube, the 14th field-effect tube, the 15th field-effect tube and the 16th field-effect tube；
The source electrode of 13rd field-effect tube is connect with the drain electrode of the 16th field-effect tube, the 13rd field-effect tube
Drain electrode connect with the drain electrode of the 14th field-effect tube；
The source electrode of 14th field-effect tube is connected with the drain electrode of the 15th field-effect tube, the 15th field-effect tube
Source electrode connect with the source electrode of the 16th field-effect tube；
The drain electrode of the source electrode and the 15th field-effect tube of 13rd field-effect tube collectively forms as the commutation inversion
4th voltage input end of unit and the 5th voltage output end of the commutation inversion unit；
The drain electrode of 14th field-effect tube and the source electrode of the 15th field-effect tube collectively form as the commutation inversion
Second primary voltage input terminal of the first target voltage output end of unit and the commutation inversion unit.
10. a kind of isolation bidirectional DC-DC converter as described in claim 1, which is characterized in that the high voltage protective module packet
It includes:
For carrying out overvoltage protection to first primary voltage, and the height of overvoltage protection is carried out to second target voltage
Press failure protection module；
It is connect with the high voltage fault protective module, for original to described first after high voltage fault protective module protection
The high pressure that the transient current peak value of second target voltage after the transient current peak value and polarity protection of voltage is inhibited
Surge protection module；
It is connect with the high voltage surge protective module, for first primary voltage and described after being protected to high voltage surge
The high pressure polarity protective module of two target voltages progress polarity protection.
11. a kind of isolation bidirectional DC-DC converter as described in claim 1, which is characterized in that the low-voltage variation module packet
It includes:
For carrying out polarity protection to the first target voltage, and it is former to described second after surge protection and error protection
The low pressure polarity protection module of beginning voltage progress polarity protection；
It is connect with the low pressure polarity protection module, for the first object after the low pressure polarity protection module protection
Voltage and second primary voltage carry out overvoltage protection, and to described first after the low pressure polarity protection module protection
The low pressure surge failure that the transient current peak value of the transient current peak value of target voltage and second primary voltage is inhibited
Protective module.
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| CN109889048A (en) * | 2019-03-08 | 2019-06-14 | 钛白金科技（深圳）有限公司 | A kind of isolation bidirectional DC-DC converter |
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