CN105743353A - DC-DC conversion circuit, control method thereof and solid-state transformer - Google Patents
DC-DC conversion circuit, control method thereof and solid-state transformer Download PDFInfo
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- CN105743353A CN105743353A CN201610256943.XA CN201610256943A CN105743353A CN 105743353 A CN105743353 A CN 105743353A CN 201610256943 A CN201610256943 A CN 201610256943A CN 105743353 A CN105743353 A CN 105743353A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a DC-DC conversion circuit, a control method thereof and a solid-state transformer. The DC-DC conversion circuit comprises a voltage detection circuit, a current detection circuit, a controller, a driving circuit, a DC-AC converter, an AC-DC converter and a high-frequency transformer with a self-coupling tap. By the DC-DC conversion circuit, high efficiency can be acquired in the whole load changing range.
Description
Technical field
The invention belongs to electric and electronic technical field, relate to a kind of DC-DC conversion circuit, its control
Method processed and solid-state transformer.
Background technology
Past 10 years, due to energy shortage and problem of environmental pollution, regenerative resource distributed power generation
By extensive concern.But, intermittence and randomness that regenerative resource is intrinsic give tradition administration of power networks
Distributed power generation synchronizing mode under pattern proposes stern challenge.In order to whole electrical network is carried out
Optimal management, experts and scholars propose the multiple method realizing intelligent grid concept, wherein " energy
The Internet, source " it is representative one.Solid-state transformer is claimed in " energy the Internet "
For " energy router ", it is made up of power electronic devices and high frequency transformer, is possible not only to realize
The function of traditional power transformer, also has that volume is little, lightweight, anti-disturbance, energy intelligence
Can the advantage such as management and power density height.
Up to the present, during the solid-state transformer topology that researcher is proposed is according to energy conversion
Whether there is intermediate DC link and can be roughly divided into two classes.AC-AC direct changing type topology uses more
Few switching device, structure is simpler, and volume is less, but secondary side voltage, current waveform base
It is the reduction to primary side waveform in basis, it is impossible to play the effect improving the quality of power supply.AC-DC-AC
In type topology, although power conversion link and switching device increasing number, but combine pulse width
Modulation (PWM) method and other be suitable for control strategy, can to the voltage of system, electric current and
Power carries out flexible, therefore represents the development trend in future.
In order to design the solid-state transformer through engineering approaches model machine being applicable to transmission and distribution network electric pressure, permissible
Take two kinds of measures.One is the novel switched device that exploitation has high pressure grade, such as silicon carbide device
Part and gallium nitride device.In this way, the connection of a small amount of devices in series can meet electric pressure need
Asking, the most ripe control strategy can also be transplanted and be continuing with.But, novel switched device
Part is at present costly (than traditional silicon switching device your 10-20 times), and large-scale application is the most unrealistic.
Another route be the multi-level converter that is made up of the transwitch device commonly used at present of application and
Module-cascade code converter.The working method of multi-level converter is relative complex, and along with fly across
Increasing of electric capacity and clamp diode quantity, system reliability drastically declines.Module-cascade type converts
Device demonstrates superiority at aspects such as system reliability, modular character concordance and failure tolerants,
Compactedness and the work efficiency of system can be significantly improved.At present about module-cascade type solid-state transformation
The research work of device is concentrated mainly on the current-sharing all pressing and exporting electric current of input voltage.
But, the actual application of solid-state transformer scheme distance that domestic and international researcher is proposed all also has
Gap, major reason is by bringing while raising operating frequency and reducing volume of transformer
Core loss increases substantially with electronic power switch device loss, therefore with traditional power transformer
Comparing, solid-state transformer is inefficient.In order to reduce the switching loss of electronic power switch device,
Use the mode of resonant type soft-switch, make device be operated in ZVT (ZVS) state.Soft open
The application of pass technology can reduce the switching loss of changer, improves the work efficiency of changer, for
The high frequency of changer provides probability, improves power density and dynamic property.
The ZVS duty of electronic power switch device is by the circulating energy in change of current inductance
Realize for resonant capacitance discharge and recharge.Circulating energy increases, simultaneously along with the increase of change of current inductance
Increase as well as the increase of load current.Prior art all uses fixing Transformer Winding
Leakage inductance or external inductance are as change of current inductance, and when gently loading, load current is little, and change of current inductance is not
Enough big, circulating energy deficiency can cause electronic power switch device to exit ZVS duty；At weight
During load, load current is big, and change of current inductance keeps constant, circulating energy is excessive cause bigger
Additional on-state loss.Meanwhile, during light load, the major part of system loss is the ferrum of high frequency transformer
Core loss, and this is not the most optimized by prior art.In sum, prior art can only be
High efficiency is obtained in the narrowest loading range.
Summary of the invention
It is an object of the invention to the shortcoming overcoming above-mentioned prior art, it is provided that a kind of DC-DC
Translation circuit, its control method and solid-state transformer, this circuit, its control method and solid-state
Transformator can obtain high efficiency in whole load excursion.
For reaching above-mentioned purpose, DC-DC conversion circuit of the present invention, it is characterised in that include letter
Number input, signal output part, controller, drive circuit, DC-AC changer, AC-DC
Changer and the high frequency transformer of band self coupling tap, for detecting AC-DC converter outfan
The voltage detecting circuit of voltage, for detecting the current detection circuit of the electric current of converter output terminal；
The input of DC-AC changer is connected with signal input part, AC-DC converter defeated
Go out end to be connected with signal output part；
The a brachium pontis midpoint of DC-AC changer is connected with one end of primary coil in high frequency transformer
Connect, the b brachium pontis midpoint of DC-AC changer and the self coupling tap phase of primary coil in high frequency transformer
Connect, the c brachium pontis midpoint of DC-AC changer and the other end phase of primary coil in high frequency transformer
Connect；
The d brachium pontis midpoint of AC-DC converter is connected with one end of secondary coil in high frequency transformer
Connect, the e brachium pontis midpoint of AC-DC converter and the self coupling tap phase of secondary coil in high frequency transformer
Connect, the f brachium pontis midpoint of AC-DC converter and the other end phase of secondary coil in high frequency transformer
Connect；
The input of the outfan of voltage detecting circuit and the outfan of current detection circuit and controller
Being connected, the outfan of controller is connected with the input of drive circuit, the output of drive circuit
The control end controlling end and AC-DC converter with DC-AC changer is held to be connected.
Described DC-AC changer includes an IGBT pipe, the 2nd IGBT pipe, the 3rd IGBT
Pipe, the 4th IGBT pipe, the 5th IGBT pipe, the 6th IGBT pipe, the first diode, the two or two
Pole pipe, the 3rd diode, the 4th diode, the 5th diode, the 6th diode, the first electric capacity,
Second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 6th electric capacity；
The negative electrode of described first diode and anode respectively with colelctor electrode and the transmitting of an IGBT pipe
Pole is connected, and the two ends of the first electric capacity are connected with colelctor electrode and the emitter stage of an IGBT pipe respectively
Connect；The negative electrode of the second diode and anode respectively with colelctor electrode and the emitter stage phase of the 2nd IGBT pipe
Connecting, the two ends of the second electric capacity are connected with colelctor electrode and the emitter stage of the 2nd IGBT pipe respectively；
The negative electrode of the 3rd diode and anode are connected with colelctor electrode and the emitter stage of the 3rd IGBT pipe respectively
Connecing, the two ends of the 3rd electric capacity are connected with colelctor electrode and the emitter stage of the 3rd IGBT pipe respectively；The
The negative electrode of four diodes and anode are connected with colelctor electrode and the emitter stage of the 4th IGBT pipe respectively,
The two ends of the 4th electric capacity are connected with colelctor electrode and the emitter stage of the 4th IGBT pipe respectively；Five or two
The negative electrode of pole pipe and anode are connected with colelctor electrode and the emitter stage of the 5th IGBT pipe respectively, and the 5th
The two ends of electric capacity are connected with colelctor electrode and the emitter stage of the 5th IGBT pipe respectively；6th diode
Negative electrode and anode be connected with colelctor electrode and the emitter stage of the 6th IGBT pipe respectively, the 6th electric capacity
Two ends be connected with colelctor electrode and the emitter stage of the 6th IGBT pipe respectively；Oneth IGBT pipe
In emitter stage and the colelctor electrode of the 2nd IGBT pipe and high frequency transformer, one end of primary coil is connected
Connect, at the beginning of in the emitter stage of the 3rd IGBT pipe and the colelctor electrode of the 4th IGBT pipe and high frequency transformer
The self coupling tap of level coil is connected, the emitter stage of the 5th IGBT pipe and the collection of the 6th IGBT pipe
In electrode and high frequency transformer, the other end of primary coil is connected；
The outfan of drive circuit and the grid of an IGBT pipe, the grid of the 2nd IGBT pipe,
The grid of the 3rd IGBT pipe, the grid of the 4th IGBT pipe, the grid and the 6th of the 5th IGBT pipe
The grid of IGBT pipe is connected；
The colelctor electrode of the oneth IGBT pipe, the colelctor electrode of the 3rd IGBT pipe and the collection of the 5th IGBT pipe
Electrode is connected with the positive pole of signal input part；The emitter stage of the 2nd IGBT pipe, the 4th IGBT
The emitter stage of pipe and the emitter stage of the 6th IGBT pipe are connected with the negative pole of signal input part.
Described AC-DC converter includes the 7th IGBT pipe, the 8th IGBT pipe, the 9th IGBT
Pipe, the tenth IGBT pipe, the 11st IGBT pipe, the 12nd IGBT pipe, the 7th diode,
Eight diodes, the 9th diode, the tenth diode, the 11st diode, the 12nd diode,
7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, the 11st electric capacity and the 12nd electric capacity；
The negative electrode of described 7th diode and anode respectively with colelctor electrode and the transmitting of the 7th IGBT pipe
Pole is connected, and the two ends of the 7th electric capacity are connected with colelctor electrode and the emitter stage of the 7th IGBT pipe respectively
Connect；The negative electrode of the 8th diode and anode respectively with colelctor electrode and the emitter stage phase of the 8th IGBT pipe
Connecting, the two ends of the 8th electric capacity are connected with colelctor electrode and the emitter stage of the 8th IGBT pipe respectively；
The negative electrode of the 9th diode and anode are connected with colelctor electrode and the emitter stage of the 9th IGBT pipe respectively
Connecing, the two ends of the 9th electric capacity are connected with colelctor electrode and the emitter stage of the 9th IGBT pipe respectively；The
The negative electrode of ten diodes and anode are connected with colelctor electrode and the emitter stage of the tenth IGBT pipe respectively,
The two ends of the tenth electric capacity are connected with colelctor electrode and the emitter stage of the tenth IGBT pipe respectively；11st
The negative electrode of diode and anode are connected with colelctor electrode and the emitter stage of the 11st IGBT pipe respectively,
The two ends of the 11st electric capacity are connected with colelctor electrode and the emitter stage of the 11st IGBT pipe respectively；The
The negative electrode of 12 diodes and anode are connected with colelctor electrode and the emitter stage of the 12nd IGBT pipe respectively
Connecing, the two ends of the 12nd electric capacity are connected with colelctor electrode and the emitter stage of the 12nd IGBT pipe respectively；
Secondary wire in the emitter stage of the 7th IGBT pipe and the colelctor electrode of the 8th IGBT pipe and high frequency transformer
One end of circle is connected, the emitter stage of the 9th IGBT pipe and the colelctor electrode of the tenth IGBT pipe and height
In frequency power transformer, the self coupling tap of secondary coil is connected, the emitter stage of the 11st IGBT pipe and
In the colelctor electrode of 12 IGBT pipes and high frequency transformer, the other end of secondary coil is connected；
The outfan of drive circuit and the grid of the 7th IGBT pipe, the grid of the 8th IGBT pipe,
The grid of the 9th IGBT pipe, the grid of the tenth IGBT pipe, the grid of the 11st IGBT pipe and
The grid of 12 IGBT pipes is connected；
The colelctor electrode of the 7th IGBT pipe, the colelctor electrode of the 9th IGBT pipe and the 11st IGBT pipe
Colelctor electrode is connected with the positive pole of signal output part；The emitter stage of the 8th IGBT pipe, the tenth IGBT
The emitter stage of pipe and the emitter stage of the 12nd IGBT pipe are connected with the negative pole of signal output part.
The control method of DC-DC conversion circuit of the present invention comprises the following steps:
Current detection circuit obtains the load current information of AC-DC converter outfan in real time, and
The load current information of AC-DC converter outfan is forwarded in controller, controller according to
In the load current information of AC-DC converter outfan must preset power frequency period, load current is effective
The meansigma methods of value；
When in default power frequency period, the meansigma methods of load current virtual value is less than minimum preset value, control
Device processed sends the first driving signal, and drive circuit drives signal to make DC-AC become according to described first
The work brachium pontis of parallel operation is set to a brachium pontis and c brachium pontis, makes the service bridge of AC-DC converter simultaneously
Arm is set to d brachium pontis and f brachium pontis；
When in default power frequency period the meansigma methods of load current virtual value more than or equal to minimum preset value and
During less than or equal to maximum preset value, controller sends two driving signal, and drive circuit is according to described
Two driving signal makes the work brachium pontis of DC-AC changer be set to a brachium pontis and b brachium pontis, with
Time make the work brachium pontis of AC-DC converter be set to d brachium pontis and e brachium pontis；
When in default power frequency period, the meansigma methods of load current virtual value is more than maximum preset value, control
Device processed produces the 3rd driving signal, and drive circuit drives signal to make DC-AC become according to the described 3rd
The work brachium pontis of parallel operation is set to b brachium pontis and c brachium pontis, makes the work of AC-DC converter simultaneously
Brachium pontis is set to e brachium pontis and f brachium pontis.
Solid-state transformer of the present invention includes n commutator, n section high voltage dc bus, n
Section low-voltage direct bus, inverter, wave filter and n DC-DC conversion circuit；
The positive pole of the positive pole of electrical network and first rectifier input is connected, and later commutator is defeated
The positive pole entering end is connected with the negative pole of previous rectifier input, the n-th rectifier input
Negative pole be connected with the negative pole of electrical network, the outfan of i-th commutator pass through i-th section of high straightening
Stream bus is connected with the input of DC-AC changer in i-th DC-DC conversion circuit, n
The positive pole of the outfan of AC-DC converter and low-voltage direct in individual DC-DC conversion circuit (4)
The positive pole of bus is connected, and in n DC-DC conversion circuit, AC-DC converter outfan is negative
Pole is connected with the negative pole of low-voltage direct bus, and the input of inverter is connected with low-voltage direct bus
Connecing, the outfan of inverter is connected with the input of wave filter, the outfan of wave filter and load
It is connected, wherein, 1≤i≤n.
The positive pole of the positive pole of electrical network and first rectifier input is connected by grid side filter inductance
Connect.
It is provided with high voltage dc bus electric capacity between positive pole and the negative pole of each high voltage dc bus.
It is provided with low-voltage direct bus capacitor between positive pole and the negative pole of each low-voltage direct bus.
The method have the advantages that
DC-DC conversion circuit of the present invention and control method thereof in use, when default work
Frequently in the cycle, the meansigma methods of load current virtual value is in heavy duty more than maximum preset value, i.e. system
State, then the work brachium pontis making DC-AC changer is b brachium pontis and c brachium pontis, makes AC-DC become
The work brachium pontis of parallel operation is set to e brachium pontis and f brachium pontis, reduces change of current inductance, thus reduces by following
The additional on-state loss that ring energy causes；When load current virtual value average in default power frequency period
When value is more than or equal to minimum preset value and less than or equal to maximum preset value, then make DC-AC changer
Work brachium pontis be a brachium pontis and b brachium pontis, the work brachium pontis of AC-DC converter is set to d brachium pontis
And e brachium pontis, maintain change of current inductance for preferably fixing change of current inductance value, retain tradition DC-DC and become
The high-efficiency operation of parallel operation is interval；When in default power frequency period, the meansigma methods of load current virtual value is little
When minimum preset value, when i.e. system is in and gently loads, then make the service bridge of DC-AC changer
Arm is a brachium pontis and c brachium pontis, and the work brachium pontis of AC-DC converter is set to d brachium pontis and f brachium pontis,
Increasing change of current inductance, switching device, in ZVS duty, alleviates each IGBT to make energy be able to maintain that
The switching loss of pipe, umber of turn increases reduction iron core inside transformer loss simultaneously.Of the present invention
Solid-state transformer in use, according to load situation switch operating brachium pontis, regulate high frequency transformation
Armature winding and the number of turn of secondary windings in device, it is achieved the high-efficiency operation in wide loading range.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of DC-DC conversion circuit 4 in the present invention；
Fig. 2 is the circuit diagram of solid-state transformer in the present invention；
Fig. 3 is the flow chart of DC-DC converter brachium pontis switching in the present invention.
Wherein, 1 it is grid side filter inductance, 2 is commutator, 3 is high voltage dc bus, 4 is
DC-DC conversion circuit, 5 be low-voltage direct bus, 6 be inverter, 7 for wave filter.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail:
With reference to Fig. 1 and Fig. 2, DC-DC conversion circuit of the present invention includes that signal input part, signal are defeated
Go out end, controller, drive circuit, DC-AC changer, AC-DC converter and band self coupling to take out
Head high frequency transformer HFT, for detect AC-DC converter outfan voltage voltage inspection
Slowdown monitoring circuit, for detecting the current detection circuit of electric current of AC-DC converter outfan；DC-AC
The input of changer is connected with signal input part, and the outfan of AC-DC converter is defeated with signal
Go out end to be connected；The a brachium pontis midpoint of DC-AC changer is primary line with high frequency transformer HFT
One end of circle is connected, at the beginning of in the b brachium pontis midpoint of DC-AC changer and high frequency transformer HFT
The self coupling tap of level coil is connected, the c brachium pontis midpoint of DC-AC changer and high frequency transformer
In HFT, the other end of primary coil is connected；The d brachium pontis midpoint of AC-DC converter becomes with high frequency
In depressor HFT, one end of secondary coil is connected, and the e brachium pontis midpoint of AC-DC converter is with high
In frequency power transformer HFT, the self coupling tap of secondary coil is connected, the f brachium pontis of AC-DC converter
Midpoint is connected with the other end of secondary coil in high frequency transformer HFT；Voltage detecting circuit defeated
Go out end and the outfan of current detection circuit is connected with the input of controller, the output of controller
End is connected with the input of drive circuit, the outfan of drive circuit and DC-AC changer
The control end controlling end and AC-DC converter is connected.
Described DC-AC changer includes an IGBT pipe S1, the 2nd IGBT pipe S2, the 3rd
IGBT pipe S3, the 4th IGBT pipe S4, the 5th IGBT pipe S5, the 6th IGBT pipe S6,
One diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the five or two
Pole pipe D5, the 6th diode D6, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3,
Four electric capacity C4, the 5th electric capacity C5And the 6th electric capacity C6；Described first diode D1Negative electrode and sun
Pole respectively with an IGBT pipe S1Colelctor electrode and emitter stage be connected, the first electric capacity C1Two ends
Respectively with an IGBT pipe S1Colelctor electrode and emitter stage be connected；Second diode D2The moon
Pole and anode respectively with the 2nd IGBT pipe S2Colelctor electrode and emitter stage be connected, the second electric capacity C2
Two ends respectively with the 2nd IGBT pipe S2Colelctor electrode and emitter stage be connected；3rd diode
D3Negative electrode and anode respectively with the 3rd IGBT pipe S3Colelctor electrode and emitter stage be connected, the 3rd
Electric capacity C3Two ends respectively with the 3rd IGBT pipe S3Colelctor electrode and emitter stage be connected；Four or two
Pole pipe D4Negative electrode and anode respectively with the 4th IGBT pipe S4Colelctor electrode and emitter stage be connected,
4th electric capacity C4Two ends respectively with the 4th IGBT pipe S4Colelctor electrode and emitter stage be connected；The
Five diode D5Negative electrode and anode respectively with the 5th IGBT pipe S5Colelctor electrode and emitter stage phase
Connect, the 5th electric capacity C5Two ends respectively with the 5th IGBT pipe S5Colelctor electrode and emitter stage be connected
Connect；6th diode D6Negative electrode and anode respectively with the 6th IGBT pipe S6Colelctor electrode and send out
Emitter-base bandgap grading is connected, the 6th electric capacity C6Two ends respectively with the 6th IGBT pipe S6Colelctor electrode and transmitting
Pole is connected；Oneth IGBT pipe S1Emitter stage and the 2nd IGBT pipe S2Colelctor electrode and high frequency
In transformator HFT, one end of primary coil is connected, the 3rd IGBT pipe S3Emitter stage and the 4th
IGBT pipe S4Colelctor electrode and high frequency transformer HFT in the self coupling tap of primary coil be connected,
5th IGBT pipe S5Emitter stage and the 6th IGBT pipe S6Colelctor electrode and high frequency transformer
(HFT) in, the other end of primary coil is connected；The outfan of drive circuit and an IGBT
Pipe S1Grid, the 2nd IGBT pipe S2Grid, the 3rd IGBT pipe S3Grid, the 4th
IGBT pipe S4Grid, the 5th IGBT pipe S5Grid and the 6th IGBT pipe S6Grid phase
Connect；Oneth IGBT pipe S1Colelctor electrode, the 3rd IGBT pipe S3Colelctor electrode and the 5th IGBT
Pipe S5Colelctor electrode be connected with the positive pole of signal input part；2nd IGBT pipe S2Emitter stage,
4th IGBT pipe S4Emitter stage and the 6th IGBT pipe S6Emitter stage and signal input part negative
Pole is connected.
Described AC-DC converter includes the 7th IGBT pipe S7, the 8th IGBT pipe S8, the 9th
IGBT pipe S9, the tenth IGBT pipe S10, the 11st IGBT pipe S11, the 12nd IGBT pipe S12、
7th diode D7, the 8th diode D8, the 9th diode D9, the tenth diode D10, the tenth
One diode D11, the 12nd diode D12, the 7th electric capacity C7, the 8th electric capacity C8, the 9th electricity
Hold C9, the tenth electric capacity C10, the 11st electric capacity C11And the 12nd electric capacity C12；Described seven or two pole
Pipe D7Negative electrode and anode respectively with the 7th IGBT pipe S7Colelctor electrode and emitter stage be connected,
7th electric capacity C7Two ends respectively with the 7th IGBT pipe S7Colelctor electrode and emitter stage be connected；The
Eight diode D8Negative electrode and anode respectively with the 8th IGBT pipe S8Colelctor electrode and emitter stage phase
Connect, the 8th electric capacity C8Two ends respectively with the 8th IGBT pipe S8Colelctor electrode and emitter stage be connected
Connect；9th diode D9Negative electrode and anode respectively with the 9th IGBT pipe S9Colelctor electrode and send out
Emitter-base bandgap grading is connected, the 9th electric capacity C9Two ends respectively with the 9th IGBT pipe S9Colelctor electrode and transmitting
Pole is connected；Tenth diode D10Negative electrode and anode respectively with the tenth IGBT pipe S10Current collection
Pole and emitter stage are connected, the tenth electric capacity C10Two ends respectively with the tenth IGBT pipe S10Current collection
Pole and emitter stage are connected；11st diode D11Negative electrode and anode respectively with the 11st IGBT
Pipe S11Colelctor electrode and emitter stage be connected, the 11st electric capacity C11Two ends respectively with the 11st
IGBT pipe S11Colelctor electrode and emitter stage be connected；12nd diode D12Negative electrode and anode
Respectively with the 12nd IGBT pipe S12Colelctor electrode and emitter stage be connected, the 12nd electric capacity C12's
Two ends respectively with the 12nd IGBT pipe S12Colelctor electrode and emitter stage be connected；7th IGBT pipe
S7Emitter stage and the 8th IGBT pipe S8Colelctor electrode and high frequency transformer HFT in secondary coil
One end be connected, the 9th IGBT pipe S9Emitter stage and the tenth IGBT pipe S10Colelctor electrode
And the self coupling tap of secondary coil is connected in high frequency transformer HFT, the 11st IGBT pipe S11
Emitter stage and the 12nd IGBT pipe S12Colelctor electrode and high frequency transformer HFT in secondary coil
The other end be connected；The outfan of drive circuit and the 7th IGBT pipe S7Grid, the 8th
IGBT pipe S8Grid, the 9th IGBT pipe S9Grid, the tenth IGBT pipe S10Grid,
11st IGBT pipe S11Grid and the 12nd IGBT pipe S12Grid be connected；7th IGBT
Pipe S7Colelctor electrode, the 9th IGBT pipe S9Colelctor electrode and the 11st IGBT pipe S11Current collection
Pole is connected with the positive pole of signal output part；8th IGBT pipe S8Emitter stage, the tenth IGBT
Pipe S10Emitter stage and the 12nd IGBT pipe S12Emitter stage be connected with the negative pole of signal output part
Connect.
The control method of DC-DC conversion circuit of the present invention comprises the following steps:
Current detection circuit obtains the load current information of AC-DC converter outfan in real time, and
The load current information of AC-DC converter outfan is forwarded in controller, controller according to
In the load current information of AC-DC converter outfan must preset power frequency period, load current is effective
The meansigma methods of value；
When in default power frequency period, the meansigma methods of load current virtual value is less than minimum preset value, control
Device processed sends the first driving signal, and drive circuit drives signal to make DC-AC become according to described first
The work brachium pontis of parallel operation is set to a brachium pontis and c brachium pontis, makes the service bridge of AC-DC converter simultaneously
Arm is set to d brachium pontis and f brachium pontis；
When in default power frequency period the meansigma methods of load current virtual value more than or equal to minimum preset value and
During less than or equal to maximum preset value, controller sends two driving signal, and drive circuit is according to described
Two driving signal makes the work brachium pontis of DC-AC changer be set to a brachium pontis and b brachium pontis, with
Time make the work brachium pontis of AC-DC converter be set to d brachium pontis and e brachium pontis；
When in default power frequency period, the meansigma methods of load current virtual value is more than maximum preset value, control
Device processed produces the 3rd driving signal, and drive circuit drives signal to make DC-AC become according to the described 3rd
The work brachium pontis of parallel operation is set to b brachium pontis and c brachium pontis, makes the work of AC-DC converter simultaneously
Brachium pontis is set to e brachium pontis and f brachium pontis.
It should be noted that the high frequency of described primary coil and secondary coil all band self coupling taps every
From transformator, its winding leakage inductance, as change of current inductance and electric capacity generation resonance, makes each IGBT plumber
Make in ZVS state；The umber of turn accessing circuit is the most, and the change of current inductance value participating in resonance is the biggest；
Before and after the duty of DC-AC changer and AC-DC converter bridge arm changes, it is ensured that primary
Coil is constant with the umber of turn ratio in secondary coil.
With reference to Fig. 3, solid-state transformer of the present invention includes n commutator 2, the high straightening of n section
Stream bus 3, n section low-voltage direct bus 5, inverter 6, wave filter 7 and n claim 1
Described DC-DC conversion circuit 4；The positive pole of electrical network and the positive pole of first commutator 2 input
It is connected, the positive pole of later commutator 2 input and the negative pole of previous commutator 2 input
Being connected, the negative pole of the n-th commutator 2 input is connected with the negative pole of electrical network, and i-th is whole
The outfan of stream device 2 is by i-th section of high voltage dc bus 3 and i-th DC-DC conversion circuit 4
The input of middle DC-AC changer is connected, AC-DC in n DC-DC conversion circuit (4)
The positive pole of the outfan of changer is connected with the positive pole of low-voltage direct bus 5, and n DC-DC becomes
Change the negative pole of AC-DC converter outfan in circuit 4 to be connected with the negative pole of low-voltage direct bus 5
Connecing, the input of inverter 6 is connected with low-voltage direct bus 5, the outfan of inverter 6 with
The input of wave filter 7 is connected, and the outfan of wave filter 7 is connected with load, wherein, and 1
≤i≤n。
It should be noted that the positive pole of the positive pole of electrical network and first commutator 2 input is by electricity
Net side filter inductance 1 is connected；It is provided with high pressure between positive pole and the negative pole of each high voltage dc bus 3
Dc-link capacitance；It is provided with low-voltage direct bus between positive pole and the negative pole of each low-voltage direct bus 5
Electric capacity.
Commutator 2 uses voltage, current double closed-loop to control and phase-shift PWM controlled, outside voltage
Environmental protection card high voltage dc bus 3 voltage constant, current inner loop makes the Phase Tracking of net side input current
Input voltage phase runs to realize unity power factor, and phase-shift PWM controlled improves commutator 2
The sine degree of AC voltage, reduces harmonic wave and electromagnetic interference；DC-DC conversion circuit 4 uses moves
Phase control, high-pressure side DC-AC changer and low-pressure side AC-DC converter all use the dutycycle to be
The square wave drive of 50%, but the IGBT of the latter is than the driving signal of device on the former correspondence position
Postpone a phase angle, and the size at phase angle is by low-voltage direct bus 5 voltage actual magnitude and phase
The deviation hoping amplitude determines through PI regulation；Inverter 6 uses has voltage effective value outer shroud and voltage
The double-loop control strategy of instantaneous value internal ring, after the filtered device of output voltage 7 filters higher hamonic wave,
The sinusoidal voltage of constant amplitude is provided for load.
When gently loading, the ratio that core loss accounts for total losses is big, now adjusts DC-AC conversion
The work brachium pontis of device and AC-DC converter makes transformation in the DC-DC conversion circuit 4 of access circuit
Device umber of turn increases, but electromotive force produced by its each circle reduces, and iron core magnetic flux density is also
Decrease.Magnetic hystersis loss and eddy-current loss are all greatly reduced with the reduction of iron core magnetic flux density
, no-load current and open circuit loss are the most correspondingly greatly reduced, thus admirably achieve
The purpose of saving energy and decreasing loss.Meanwhile, umber of turn increase makes the circulating energy of change of current inductance light negative
Keep higher value during load, maintain the ZVS duty of electronic power switch device, to alleviate switch
Loss.When middle load, tradition DC-DC converter is generally of higher work efficiency, this
Time maintain the change of current inductance to be by adjusting the work brachium pontis of DC-AC changer and AC-DC converter
Preferably fixing change of current inductance value, the high-efficiency operation retaining tradition DC-DC converter is interval.?
During heavy duty, the ratio that on-state loss accounts for is big, now adjusts DC-AC changer and AC-DC becomes
The work brachium pontis of parallel operation makes transformator HFT winding turns in the DC-DC conversion circuit 4 of access circuit
Number reduces, and the circulating energy of change of current inductance reduces, and alleviates additional on-state loss.
The present invention carries transformator in the DC-DC conversion circuit 4 of situation change access circuit according to band
HFT umber of turn, it is achieved reduce the core loss of transformator HFT during light load, and maintain IGBT
Sofe Switch duty with reduce devices switch loss, during heavy duty reduce circulated by change of current inductance
Additional on-state loss caused by energy, it is achieved solid-state transformer HFT height in wide loading range
Efficiency is run.
Specific embodiment described herein is only to present invention spirit explanation for example.The present invention
Described specific embodiment can be modified by person of ordinary skill in the field, supplement or
Substitute by approximation method, but without departing from the spirit of the present invention or surmount appended claims
Defined scope.
Claims (8)
1. a DC-DC conversion circuit, it is characterised in that include that signal input part, signal export
End, controller, drive circuit, DC-AC changer, AC-DC converter and band self coupling tap
High frequency transformer (HFT), for detect AC-DC converter outfan voltage voltage detecting electricity
Road, for detecting the current detection circuit of electric current of AC-DC converter outfan；
The input of DC-AC changer is connected with signal input part, the output of AC-DC converter
End is connected with signal output part；
The a brachium pontis midpoint of DC-AC changer and one end of primary coil in high frequency transformer (HFT)
It is connected, the b brachium pontis midpoint of DC-AC changer and primary coil in high frequency transformer (HFT)
Self coupling tap is connected, at the beginning of in the c brachium pontis midpoint of DC-AC changer and high frequency transformer (HFT)
The other end of level coil is connected；
The d brachium pontis midpoint of AC-DC converter and one end of secondary coil in high frequency transformer (HFT)
It is connected, the e brachium pontis midpoint of AC-DC converter and secondary coil in high frequency transformer (HFT)
Self coupling tap is connected, and the f brachium pontis midpoint of AC-DC converter is secondary with high frequency transformer (HFT)
The other end of level coil is connected；
The input of the outfan of voltage detecting circuit and the outfan of current detection circuit and controller
Being connected, the outfan of controller is connected with the input of drive circuit, the outfan of drive circuit
It is connected with the control end controlling end and AC-DC converter of DC-AC changer.
DC-DC conversion circuit the most according to claim 1, it is characterised in that described DC-AC
Changer includes that an IGBT manages (S1), the 2nd IGBT manage (S2), the 3rd IGBT manage (S3)、
4th IGBT manages (S4), the 5th IGBT manage (S5), the 6th IGBT manage (S6), the one or two pole
Pipe (D1), the second diode (D2), the 3rd diode (D3), the 4th diode (D4), the 5th
Diode (D5), the 6th diode (D6), the first electric capacity (C1), the second electric capacity (C2), the 3rd
Electric capacity (C3), the 4th electric capacity (C4), the 5th electric capacity (C5) and the 6th electric capacity (C6)；
Described first diode (D1) negative electrode and anode respectively with the oneth IGBT manage (S1) collection
Electrode and emitter stage are connected, the first electric capacity (C1) two ends respectively with the oneth IGBT manage (S1)
Colelctor electrode and emitter stage be connected；Second diode (D2) negative electrode and anode respectively with second
IGBT manages (S2) colelctor electrode and emitter stage be connected, the second electric capacity (C2) two ends respectively with
2nd IGBT manages (S2) colelctor electrode and emitter stage be connected；3rd diode (D3) negative electrode
And anode respectively with the 3rd IGBT manage (S3) colelctor electrode and emitter stage be connected, the 3rd electric capacity (C3)
Two ends respectively with the 3rd IGBT manage (S3) colelctor electrode and emitter stage be connected；4th diode
(D4) negative electrode and anode respectively with the 4th IGBT manage (S4) colelctor electrode and emitter stage be connected,
4th electric capacity (C4) two ends respectively with the 4th IGBT manage (S4) colelctor electrode and emitter stage be connected
Connect；5th diode (D5) negative electrode and anode respectively with the 5th IGBT manage (S5) colelctor electrode
And emitter stage is connected, the 5th electric capacity (C5) two ends respectively with the 5th IGBT manage (S5) collection
Electrode and emitter stage are connected；6th diode (D6) negative electrode and anode respectively with the 6th IGBT
Pipe (S6) colelctor electrode and emitter stage be connected, the 6th electric capacity (C6) two ends respectively with the 6th IGBT
Pipe (S6) colelctor electrode and emitter stage be connected；Oneth IGBT manages (S1) emitter stage and second
IGBT manages (S2) colelctor electrode and high frequency transformer (HFT) in one end of primary coil be connected,
3rd IGBT manages (S3) emitter stage and the 4th IGBT manage (S4) colelctor electrode and high frequency transformation
In device (HFT), the self coupling tap of primary coil is connected, and the 5th IGBT manages (S5) emitter stage
(S is managed with the 6th IGBT6) colelctor electrode and high frequency transformer (HFT) in another of primary coil
End is connected；
The outfan of drive circuit and an IGBT manage (S1) grid, the 2nd IGBT manage (S2)
Grid, the 3rd IGBT manage (S3) grid, the 4th IGBT manage (S4) grid, the 5th
IGBT manages (S5) grid and the 6th IGBT manage (S6) grid be connected；
Oneth IGBT manages (S1) colelctor electrode, the 3rd IGBT manage (S3) colelctor electrode and the 5th
IGBT manages (S5) colelctor electrode be connected with the positive pole of signal input part；2nd IGBT manages (S2)
Emitter stage, the 4th IGBT manage (S4) emitter stage and the 6th IGBT manage (S6) emitter stage
It is connected with the negative pole of signal input part.
DC-DC conversion circuit the most according to claim 2, it is characterised in that described AC-DC
Changer includes that the 7th IGBT manages (S7), the 8th IGBT manage (S8), the 9th IGBT manage (S9)、
Tenth IGBT manages (S10), the 11st IGBT manage (S11), the 12nd IGBT manage (S12),
Seven diode (D7), the 8th diode (D8), the 9th diode (D9), the tenth diode (D10)、
11st diode (D11), the 12nd diode (D12), the 7th electric capacity (C7), the 8th electric capacity (C8)、
9th electric capacity (C9), the tenth electric capacity (C10), the 11st electric capacity (C11) and the 12nd electric capacity (C12)；
Described 7th diode (D7) negative electrode and anode respectively with the 7th IGBT manage (S7) collection
Electrode and emitter stage are connected, the 7th electric capacity (C7) two ends respectively with the 7th IGBT manage (S7)
Colelctor electrode and emitter stage be connected；8th diode (D8) negative electrode and anode respectively with the 8th
IGBT manages (S8) colelctor electrode and emitter stage be connected, the 8th electric capacity (C8) two ends respectively with
8th IGBT manages (S8) colelctor electrode and emitter stage be connected；9th diode (D9) negative electrode
And anode respectively with the 9th IGBT manage (S9) colelctor electrode and emitter stage be connected, the 9th electric capacity (C9)
Two ends respectively with the 9th IGBT manage (S9) colelctor electrode and emitter stage be connected；Tenth diode
(D10) negative electrode and anode respectively with the tenth IGBT manage (S10) colelctor electrode and emitter stage be connected
Connect, the tenth electric capacity (C10) two ends respectively with the tenth IGBT manage (S10) colelctor electrode and transmitting
Pole is connected；11st diode (D11) negative electrode and anode respectively with the 11st IGBT manage (S11)
Colelctor electrode and emitter stage be connected, the 11st electric capacity (C11) two ends respectively with the 11st IGBT
Pipe (S11) colelctor electrode and emitter stage be connected；12nd diode (D12) negative electrode and anode
(S is managed respectively with the 12nd IGBT12) colelctor electrode and emitter stage be connected, the 12nd electric capacity (C12)
Two ends respectively with the 12nd IGBT manage (S12) colelctor electrode and emitter stage be connected；7th IGBT
Pipe (S7) emitter stage and the 8th IGBT manage (S8) colelctor electrode and high frequency transformer (HFT)
One end of middle secondary coil is connected, and the 9th IGBT manages (S9) emitter stage and the tenth IGBT pipe
(S10) colelctor electrode and high frequency transformer (HFT) in the self coupling tap of secondary coil be connected,
11 IGBT manage (S11) emitter stage and the 12nd IGBT manage (S12) colelctor electrode and high frequency become
In depressor (HFT), the other end of secondary coil is connected；
The outfan of drive circuit and the 7th IGBT manage (S7) grid, the 8th IGBT manage (S8)
Grid, the 9th IGBT manage (S9) grid, the tenth IGBT manage (S10) grid, the tenth
One IGBT manages (S11) grid and the 12nd IGBT manage (S12) grid be connected；
7th IGBT manages (S7) colelctor electrode, the 9th IGBT manage (S9) colelctor electrode and the tenth
One IGBT manages (S11) colelctor electrode be connected with the positive pole of signal output part；8th IGBT manages (S8)
Emitter stage, the tenth IGBT manage (S10) emitter stage and the 12nd IGBT manage (S12) transmitting
Pole is connected with the negative pole of signal output part.
4. the control method of a DC-DC conversion circuit, it is characterised in that based on claim 1
Described DC-DC conversion circuit (4), comprises the following steps:
Current detection circuit obtains the load current information of AC-DC converter outfan in real time, and will
The load current information of AC-DC converter outfan is forwarded in controller, controller according to
The load current information of AC-DC converter outfan must preset load current virtual value in power frequency period
Meansigma methods；
When in default power frequency period, the meansigma methods of load current virtual value is less than minimum preset value, control
Device sends the first driving signal, and drive circuit drives signal to make DC-AC changer according to described first
Work brachium pontis be set to a brachium pontis and c brachium pontis, make the work brachium pontis of AC-DC converter set simultaneously
It is set to d brachium pontis and f brachium pontis；
When in default power frequency period the meansigma methods of load current virtual value more than or equal to minimum preset value and
During less than or equal to maximum preset value, controller sends two driving signal, and drive circuit is according to described
Two driving signal makes the work brachium pontis of DC-AC changer be set to a brachium pontis and b brachium pontis, makes simultaneously
The work brachium pontis of AC-DC converter is set to d brachium pontis and e brachium pontis；
When in default power frequency period, the meansigma methods of load current virtual value is more than maximum preset value, control
Device produces the 3rd driving signal, and drive circuit drives signal to make DC-AC changer according to the described 3rd
Work brachium pontis be set to b brachium pontis and c brachium pontis, make the work brachium pontis of AC-DC converter set simultaneously
It is set to e brachium pontis and f brachium pontis.
5. a solid-state transformer, it is characterised in that include n commutator (2), the high straightening of n section
Stream bus (3), n section low-voltage direct bus (5), inverter (6), wave filter (7) and n power
Profit requires the DC-DC conversion circuit (4) described in 1；
The positive pole of the positive pole of electrical network and first commutator (2) input is connected, later rectification
The positive pole of device (2) input is connected with the negative pole of previous commutator (2) input, and n-th
The negative pole of commutator (2) input is connected with the negative pole of electrical network, i-th commutator (2) defeated
Go out end by i-th section of high voltage dc bus (3) and DC-AC in i-th DC-DC conversion circuit (4)
The input of changer is connected, AC-DC converter in n DC-DC conversion circuit (4)
The positive pole of outfan is connected with the positive pole of low-voltage direct bus (5), n DC-DC conversion circuit
(4) in, the negative pole of AC-DC converter outfan is connected with the negative pole of low-voltage direct bus (5),
The input of inverter (6) is connected with low-voltage direct bus (5), the output of inverter (6)
End is connected with the input of wave filter (7), and the outfan of wave filter (7) is connected with load,
Wherein, 1≤i≤n.
Solid-state transformer the most according to claim 5, it is characterised in that the positive pole of electrical network with
The positive pole of first commutator (2) input is connected by grid side filter inductance (1).
Solid-state transformer the most according to claim 5, it is characterised in that each HVDC is female
It is provided with high voltage dc bus electric capacity between positive pole and the negative pole of line (3).
Solid-state transformer the most according to claim 5, it is characterised in that each low-voltage direct is female
It is provided with low-voltage direct bus capacitor between positive pole and the negative pole of line (5).
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103532398A (en) * | 2013-09-12 | 2014-01-22 | 上海查尔斯电子有限公司 | Power electronic transformer |
| CN103595259A (en) * | 2013-11-28 | 2014-02-19 | 南京航空航天大学 | Double-transformer serial-parallel isolated-type soft switching direct-current converter and control method thereof |
| CN104811047A (en) * | 2014-01-27 | 2015-07-29 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Bidirectional direct-current/direct-current converter and control method thereof |
| US20150229216A1 (en) * | 2014-02-12 | 2015-08-13 | Sanken Electric Co., Ltd. | Switching Power-Supply Device |
| CN104883065A (en) * | 2015-05-29 | 2015-09-02 | 西安交通大学 | High-frequency isolation circuit, control method thereof and solid-state transformer |
-
2016
- 2016-04-22 CN CN201610256943.XA patent/CN105743353B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532398A (en) * | 2013-09-12 | 2014-01-22 | 上海查尔斯电子有限公司 | Power electronic transformer |
| CN103595259A (en) * | 2013-11-28 | 2014-02-19 | 南京航空航天大学 | Double-transformer serial-parallel isolated-type soft switching direct-current converter and control method thereof |
| CN104811047A (en) * | 2014-01-27 | 2015-07-29 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Bidirectional direct-current/direct-current converter and control method thereof |
| US20150229216A1 (en) * | 2014-02-12 | 2015-08-13 | Sanken Electric Co., Ltd. | Switching Power-Supply Device |
| CN104883065A (en) * | 2015-05-29 | 2015-09-02 | 西安交通大学 | High-frequency isolation circuit, control method thereof and solid-state transformer |
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