CN109361323A - I type three-level soft switch circuit and corresponding three-phase translation circuit and converter plant - Google Patents
I type three-level soft switch circuit and corresponding three-phase translation circuit and converter plant Download PDFInfo
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- CN109361323A CN109361323A CN201811355319.0A CN201811355319A CN109361323A CN 109361323 A CN109361323 A CN 109361323A CN 201811355319 A CN201811355319 A CN 201811355319A CN 109361323 A CN109361323 A CN 109361323A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- 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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Abstract
The invention discloses a kind of I type three-level soft switch circuits, comprising: four switching devices being sequentially connected in series；It include a controlled tr tube and an antiparallel diode in four switching devices；Second energy-storage travelling wave tube；First energy-storage travelling wave tube；First diode；Second diode；First end is connect with the second end of the first energy-storage travelling wave tube, the first inductance of the anode connection of second end and first diode；Capacitive element；Capacitive element includes: that first end is connect with the second end of first switch device, the first capacitor that second end is connect with the second end of second switch device；First end is connect with the first end of third switching device, the second capacitor that second end is connect with the first end of the 4th switching device；Or capacitive element includes: that first end is connect with the second end of first switch device, the target capacitance that second end is connect with the first end of the 4th switching device.The invention also discloses a kind of three-phase translation circuit and converter plants, have corresponding effect.
Description
Technical field
The present invention relates to transformation of electrical energy technical fields, more particularly to a kind of I type three-level soft switch circuit and accordingly
Three-phase translation circuit and converter plant.
Background technique
Three level-conversion circuit of I type has many advantages, such as that harmonic wave is small, high-efficient, has application in many occasions.It can be found in
Fig. 1, is the structural schematic diagram of three level-conversion circuit of I type in the prior art, first switch device, second switch device, the
Three switching devices and the 4th switching device are sequentially connected in series, and the first end of first switch device is connect with positive bus-bar, the 4th switch
The second end of device is connect with negative busbar.
The second end of first switch device is connect with the first end of second switch device, common end and first diode D1
Cathode connection.The second end of third switching device is connect with the first end of the 4th switching device, common end and the two or two pole
Pipe D2Anode connection.The second end of second switch device is connect with the first end of third switching device, and common end is used as should
First output end of circuit, first diode D1Anode and the second diode D2Cathode connection, common end is as the circuit
Second output terminal namely circuit middle line.It include a controlled tr tube and an inverse parallel in four switching devices
Diode, specifically, including the first controlled tr tube Q in first switch device in Fig. 11And first freewheeling diode
Dq1, include the second controlled tr tube Q in second switch device2And first sustained diodeq2, include in third switching device
Third controlled tr tube Q3And third sustained diodeq3, include the 4th controlled tr tube Q in the 4th switching device4And the
Four sustained diodesq4。
In three level-conversion circuit of I type, the power consumption of each controlled tr tube can be divided into on-state power consumption and on-off power consumption,
On-off power consumption includes power consumption of the controlled tr tube in conducting phase and the power consumption in off-phases.When on-off exorbitant expenditure
When, the efficiency losses of controlled tr tube are larger, limit the working frequency of circuit, and be also easy to electromagnetic interference occur, noise
Pollution, the problems such as breakdown power device.Therefore, realize that the Sofe Switch of circuit is particularly significant.
Sofe Switch refer to switching device can be realized zero voltage switch, Zero Current Switch, zero-voltage and zero-current switch or
Voltage or electric current rise according to limited rate in make and break process.In existing segmentation scheme, in three level-conversion circuit of I type
On the basis of 2 resonant capacitances and 1 resonant inductance be set, and configure corresponding diode as putting for each resonant capacitance
Electric pathway realizes Sofe Switch, due to needing to configure 4 diodes, 2 resonant capacitances and 1 resonant inductance, required device
Quantity is more, so that realizing the higher cost of Sofe Switch, the reliability of circuit is reduced.
In conclusion how to realize the Sofe Switch of three level-conversion circuit of I type, and it is effectively reduced cost, improves electricity
Road reliability is current those skilled in the art technical problem urgently to be solved.
Summary of the invention
The object of the present invention is to provide a kind of I type three-level soft switch circuits, to realize the soft of three level-conversion circuit of I type
Switch, and it is effectively reduced cost, improve circuit reliability.
In order to solve the above technical problems, the invention provides the following technical scheme:
A kind of I type three-level soft switch circuit, comprising:
First end is connect with the first end of the first energy-storage travelling wave tube, the first end of second end and second switch device, and the one or two
The first switch device that the cathode of pole pipe is all connected with；
The second switch device that second end is connect with the first end of third switching device；
The first end of second end and the 4th switching device, the third derailing switch that the anode of the second diode is all connected with
Part；
The 4th switching device that second end is connect with the second end of the second energy-storage travelling wave tube；
It include a controlled tr tube and a diode in four switching devices, the cathode of the diode can with this
The first end connection for controlling switch block, as the first end of corresponding switching device, the anode of the diode and the controllable switch
The second end of component connects, the second end as the switching device；
Second energy-storage travelling wave tube that first end is connect with the second end of first energy-storage travelling wave tube；
First energy-storage travelling wave tube；
The first diode；
Second diode；
First end is connect with the second end of first energy-storage travelling wave tube, and second end is connect with the anode of the first diode
The first inductance；
Capacitive element；
The capacitive element includes:
First end is connect with the second end of the first switch device, the second end of second end and the second switch device
The first capacitor of connection；
First end is connect with the first end of the third switching device, the first end of second end and the 4th switching device
Second capacitor of connection；
Or the capacitive element includes:
First end is connect with the second end of the first switch device, the first end of second end and the 4th switching device
The target capacitance of connection.
Preferably, first energy-storage travelling wave tube is third capacitor, and the first end of the third capacitor is as first storage
The first end of energy element, second end of the second end of the third capacitor as first energy-storage travelling wave tube.
Preferably, second energy-storage travelling wave tube is the 4th capacitor, and the first end of the 4th capacitor is as second storage
The first end of energy element, second end of the second end of the 4th capacitor as second energy-storage travelling wave tube.
Preferably, first energy-storage travelling wave tube is the first DC source, and second energy-storage travelling wave tube is the second DC source.
Preferably, the controlled tr tube in four switching devices is IGBT pipe.
Preferably, the controlled tr tube in four switching devices is the metal-oxide-semiconductor without body diode.
Preferably, the diode in four switching devices is Schottky diode.
Preferably, the first switch device, the second switch device, the third switching device and the described 4th
Switching device is the metal-oxide-semiconductor with body diode.
A kind of three-phase translation circuit, comprising: the first translation circuit, the second translation circuit and third translation circuit；
The middle line of first translation circuit, second translation circuit and the third translation circuit is connected with each other,
First translation circuit, second translation circuit and the third translation circuit include I described in any of the above embodiments
Type three-level soft switch circuit.
A kind of converter plant, including I type three-level soft switch circuit described in any of the above embodiments.
Using technical solution provided by the embodiment of the present invention, comprising: first end and the first end of the first energy-storage travelling wave tube connect
It connects, the first end of second end and second switch device, the first switch device that the cathode of first diode is all connected with；Second end with
The second switch device of the first end connection of third switching device；The first end of second end and the 4th switching device, the two or two pole
The third switching device that the anode of pipe is all connected with；The 4th switching device that second end is connect with the second end of the second energy-storage travelling wave tube；
It include a controlled tr tube and a diode, the cathode of the diode and the controllable switch portion in four switching devices
The first end of part connects, as the first end of corresponding switching device, the of the anode of the diode and the controllable switch component
The connection of two ends, the second end as the switching device；The second energy storage member that first end is connect with the second end of the first energy-storage travelling wave tube
Part；First energy-storage travelling wave tube；First diode；Second diode；First end is connect with the second end of the first energy-storage travelling wave tube, second end
The first inductance being connect with the anode of first diode；Capacitive element；Capacitive element includes: first end and first switch device
Second end connection, the first capacitor that second end is connect with the second end of second switch device；First end and third switching device
First end connection, the second capacitor that second end is connect with the first end of the 4th switching device；Or capacitive element includes: first end
It is connect with the second end of first switch device, the target capacitance that second end is connect with the first end of the 4th switching device.
In the scheme of the application, Sofe Switch, also, the application is may be implemented in each controllable switch device and diode
Scheme only need on the basis of original three level-conversion circuit of I type, increase the first inductance and capacitive element, and capacitor
Component includes a target capacitance, or including first capacitor and the second capacitor, required number of devices is few, is effectively reduced
Cost, improves circuit reliability.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of three level-conversion circuit of I type in the prior art；
Fig. 2 is a kind of structural schematic diagram of I type three-level soft switch circuit in the present invention；
Fig. 3 is another structural schematic diagram of I type three-level soft switch circuit in the present invention；
Fig. 4 is in a kind of specific embodiment of the present invention, and ac output voltage is positive half period, the first controlled tr tube Q1
Before shutdown, the second capacitor C2Operation schematic diagram when charging；
Fig. 5 is in a kind of specific embodiment of the present invention, and ac output voltage is positive half period, the first controlled tr tube Q1
Shutdown, the second capacitor C2Operation schematic diagram when electric discharge；
Fig. 6 is in a kind of specific embodiment of the present invention, and ac output voltage is positive half period, the second capacitor C2Electric discharge knot
Beam, first diode D1Operation schematic diagram before conducting；
Fig. 7 is in a kind of specific embodiment of the present invention, and ac output voltage is positive half period, first diode D1Conducting
When operation schematic diagram；
Fig. 8 is in a kind of specific embodiment of the present invention, and ac output voltage is positive half period, the first controlled tr tube Q1
Before conducting, the size of current of the first inductance L reaches the operation schematic diagram of the size of current of exchange outlet side；
Fig. 9 is in a kind of specific embodiment of the present invention, and ac output voltage is positive half period, the first controlled tr tube Q1
Conducting, first diode D1Operation schematic diagram when conducting；
Figure 10 is in a kind of specific embodiment of the present invention, and ac output voltage is negative half-cycle, the 4th controlled tr tube
Q4Before shutdown, first capacitor C1Operation schematic diagram when charging；
Figure 11 is in a kind of specific embodiment of the present invention, and ac output voltage is negative half-cycle, the 4th controlled tr tube
Q4Shutdown, first capacitor C1Operation schematic diagram when electric discharge；
Figure 12 is in a kind of specific embodiment of the present invention, and ac output voltage is negative half-cycle, first capacitor C1Electric discharge
Terminate, the second diode D2Operation schematic diagram before conducting；
Figure 13 is in a kind of specific embodiment of the present invention, and ac output voltage is negative half-cycle, the second diode D2It leads
Operation schematic diagram when logical；
Figure 14 is in a kind of specific embodiment of the present invention, and ac output voltage is negative half-cycle, the 4th controlled tr tube
Q4Before conducting, the size of current of the first inductance L reaches the operation schematic diagram of the size of current of exchange outlet side；
Figure 15 is in a kind of specific embodiment of the present invention, and ac output voltage is negative half-cycle, the 4th controlled tr tube
Q4Conducting, the second diode D2Operation schematic diagram when conducting.
Specific embodiment
Core of the invention is to provide I type three-level soft switch circuit, while realizing Sofe Switch, significantly reduces
Cost improves circuit reliability.
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.Obviously, described embodiments are only a part of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Fig. 2 and Fig. 3 is please referred to, Fig. 2 is the knot of I type three-level soft switch circuit in a kind of specific embodiment of the present invention
Structure schematic diagram, capacitive element is by first capacitor C in this kind of embodiment1And the second capacitor C2It constitutes, Fig. 3 is that the present invention is another
The structural schematic diagram of I type three-level soft switch circuit in specific embodiment is planted, capacitive element is by target in this kind of embodiment
Capacitor C is constituted.
I type three-level soft switch circuit provided by the present application includes:
First end is connect with the first end of the first energy-storage travelling wave tube, the first end of second end and second switch device, and the one or two
Pole pipe D1The first switch device that is all connected with of cathode；
The second switch device that second end is connect with the first end of third switching device；
The first end of second end and the 4th switching device, the second diode D2The third switching device that is all connected with of anode；
The 4th switching device that second end is connect with the second end of the second energy-storage travelling wave tube；
It include a controlled tr tube and a diode in four switching devices, the cathode of the diode can with this
The first end connection for controlling switch block, as the first end of corresponding switching device, the anode of the diode and the controllable switch
The second end of component connects, the second end as the switching device.
Convenient for description, the controlled tr tube in first switch device is known as the first controlled tr tube Q in the application1, will
In first switch device with the first controlled tr tube Q1The diode of reverse parallel connection is known as the first sustained diodeq1, accordingly
, it include the second controlled tr tube Q in second switch device2And second sustained diodeq2, include in third switching device
Third controlled tr tube Q3And third sustained diodeq3, include the 4th controlled tr tube Q in the 4th switching device4And the
Four sustained diodesq4。
In the specific implementation, it is contemplated that IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar
Transistor npn npn) have conduction voltage drop lower, the advantages that driving power is small, and switching speed is fast, and especially suitable for voltage class
In higher occasion, the controlled tr tube in four switching devices of the application can be IGBT pipe, i.e. the first controllable switch
Pipe Q1, the second controlled tr tube Q2, third controlled tr tube Q3And the 4th controlled tr tube Q4It can be IGBT pipe.At this point,
First end of the collector of each IGBT pipe as the IGBT pipe, second end of the emitter as the IGBT pipe, gate leve is as control
End processed is to determine the on-off of the IGBT.
It is of course also possible to choose metal-oxide-semiconductor (the Metal-Oxide-Semiconductor Field- without body diode
Effect Transistor, metal-oxide half field effect transistor) controlled tr tube as the application, such as a kind of specific embodiment party
In formula, the controlled tr tube in four switching devices is the metal-oxide-semiconductor without body diode.Compared to IGBT, the cost of metal-oxide-semiconductor
It is lower.And the diode in four switching devices can be chosen for the Schottky that resume speed is fast, suitable for high frequency occasion
Diode.In addition, it is contemplated that body diode is carried inside the metal-oxide-semiconductor of part, and therefore, in the scheme of the application, first switch device,
Second switch device, third switching device and the 4th switching device can be the metal-oxide-semiconductor with body diode.
The second energy-storage travelling wave tube that first end is connect with the second end of the first energy-storage travelling wave tube；
First energy-storage travelling wave tube；
First diode D1；
Second diode D2；
First energy-storage travelling wave tube and the second energy-storage travelling wave tube usually can be chosen for capacitor, the embodiment of Fig. 2 and Fig. 3
In just show third capacitor C3And the 4th capacitor C4.Specifically, third capacitor C3First end as the first energy-storage travelling wave tube
First end, third capacitor C3Second end of the second end as the first energy-storage travelling wave tube, the 4th capacitor C4First end as second storage
The first end of energy element, the 4th capacitor C4Second end of the second end as the second energy-storage travelling wave tube.When using the scheme of capacitor,
Third capacitor C3First end just connect with the input of circuit, when input be direct current when, third capacitor C3I.e. just with direct current input
Pole connection, correspondingly, the 4th capacitor C4Second end connect with the cathode that direct current inputs.
In a specific embodiment, the first energy-storage travelling wave tube can be the first DC source, and the second energy-storage travelling wave tube is second
DC source.In view of when using capacitor as the first energy-storage travelling wave tube and the second energy-storage travelling wave tube when, although the scheme of capacitor at
This is lower, but there may be fluctuations for capacitance voltage in practical application, so that the output voltage of the circuit of the application occurs partially
Difference, therefore in this embodiment, using the first DC source as the first energy-storage travelling wave tube, the second DC source is as the second energy storage
Element advantageously reduces the fluctuation situation of voltage.DC source can also be chosen for DC current source or direct current according to actual needs
Voltage source has no effect on implementation of the invention.
First end is connect with the second end of the first energy-storage travelling wave tube, second end and first diode D1Anode connection first
Inductance L；
Capacitive element；
Capacitive element includes:
First end is connect with the second end of first switch device, second end connect with the second end of second switch device
One capacitor C1；
First end is connect with the first end of third switching device, second end connect with the first end of the 4th switching device
Two capacitor C2；
Or capacitive element includes:
First end is connect with the second end of first switch device, the mesh that second end is connect with the first end of the 4th switching device
Mark capacitor C.
Hereafter by taking the embodiment of Fig. 2 as an example, the commutation course of circuit provided by the present application is illustrated, i.e., with capacitor
Component includes first capacitor C1With the second capacitor C2For be illustrated, when capacitive element includes target capacitance C, principle and this
It is identical just to repeat no more.
Fig. 4 is seen, Fig. 4 is that ac output voltage is positive half period, the first controlled tr tube Q1Before shutdown, the second capacitor
C2Operation schematic diagram when charging.Specifically, positive bus-bar passes through the first controlled tr tube Q1, the second controlled tr tube Q2To second
Capacitor C2It charges, when DC input voitage is expressed as Vdc, the second capacitor C2Charging finishes, and voltage is Vdc.Due to
The presence of first inductance L, as the second capacitor C2When charging to Vdc, the second diode D2Just reversed cut-off, and be with limited
Current changing rate cut-off, so that the second diode D2The switching loss of procedures of turn-off is very low.
Fig. 5 is seen, Fig. 5 is that ac output voltage is positive half period, the first controlled tr tube Q1Shutdown, the second capacitor C2
Operation schematic diagram when electric discharge.At this point, the second controlled tr tube Q2It tends to remain on, the 4th controlled tr tube Q4Keep cut-off
State, the first controlled tr tube Q1It converts from state to off state, and utilizes third controlled tr tube Q3It does not open also
Dead time is to the second capacitor C2It discharges.First controlled tr tube Q1During converting from state to off state,
Voltage is to start from scratch, and established with limited voltage change ratio, so that the first controlled tr tube Q1No-voltage pass may be implemented
It is disconnected.Also, due in the scheme of the application to the second capacitor C2When being discharged, what is utilized is the 4th sustained diodeq4, nothing
Discharge loop need to additionally be configured.
Fig. 6 is seen, Fig. 6 is that ac output voltage is positive half period, the second capacitor C2Electric discharge terminates, first diode D1
Operation schematic diagram before conducting.Specifically, as the second capacitor C2After electric discharge terminates, third sustained diodeq3And the 4th
Sustained diodeq4Start afterflow conducting.At this point, third controlled tr tube Q3It converts from off state on state, due to
Two capacitor C2 discharge offs, third controlled tr tube Q3Both end voltage is clamped, and realizes third controlled tr tube Q3No-voltage
It is open-minded.
Fig. 7 is seen, Fig. 7 is that ac output voltage is positive half period, first diode D1Operation schematic diagram when conducting.
First diode D1Conducting, the electric current of the first inductance L start from scratch it is linearly increasing, meanwhile, third sustained diodeq3And the
Four sustained diodesq4Electric current gradually decrease, until commutation course is completed, at this point, third freewheeling diode when reducing to zero
Dq3And the 4th sustained diodeq4Cut-off.Due to the presence of the first inductance L, so that electric current gradually rises from zero, and electric current
It cannot be mutated, therefore during this, third sustained diodeq3, the 4th sustained diodeq4, first diode D1And second
Controlled tr tube Q2Current changing rate it is limited, work in Sofe Switch state.
Fig. 8 is seen, Fig. 8 is that ac output voltage is positive half period, the first controlled tr tube Q1Before conducting, the first inductance
The size of current of L reaches the operation schematic diagram of the size of current of exchange outlet side.Specifically, the first controlled tr tube Q at this time1With
And the 4th controlled tr tube Q4In off state, the second controlled tr tube Q2And third controlled tr tube Q3It is on shape
State.Due to third controlled tr tube Q at this time3There is no electric current to pass through, electric current is from the first inductance L through first diode D1And second
Controlled tr tube Q2For load supplying, and first capacitor C1With the second capacitor C2For no-voltage discharge condition.
It may participate in Fig. 9, Fig. 9 is that ac output voltage is positive half period, the first controlled tr tube Q1Conducting, first diode
D1Operation schematic diagram when conducting.Specifically, with the first controlled tr tube Q1The positive bus-bar of connection passes through the first controlled tr tube Q1
And first diode D1Back-pressure is applied to the first inductance L, the electric current of the first inductance L is linearly reduced, meanwhile, positive bus-bar also passes through
First controlled tr tube Q1And the second controlled tr tube Q2Load is powered, when the electric current of the first inductance L is decreased to zero
When, first diode D1Cut-off.During being somebody's turn to do, the first controlled tr tube Q1From cut-off conversion to conducting when, due to the first inductance L
It powers for load current, so that then flowing through the first controlled tr tube Q1Electric current be zero, and current changing rate is limited, therefore
Realize the first controlled tr tube Q1Zero current turning-on.And third controlled tr tube Q3During conducting conversion to cut-off,
Since its both end voltage is by the second capacitor C2Clamper, and pass through third controlled tr tube Q without electric current3, therefore third controllable switch
Pipe Q3Realize no-voltage, zero-current switching.
It is described in detail when being positive half period to ac output voltage in aforementioned embodiments, works as ac output voltage
When for negative half-cycle, the course of work of circuit is similar, can carry out reference with the example of aforementioned positive half period.It may participate in figure
10, Figure 10 be ac output voltage be negative half-cycle, the 4th controlled tr tube Q4Before shutdown, first capacitor C1Work when charging
Schematic diagram.Figure 11 is that ac output voltage is negative half-cycle, the 4th controlled tr tube Q4Shutdown, first capacitor C1Work when electric discharge
Make schematic diagram.First capacitor C1After charging terminates, the 4th controlled tr tube Q may be implemented4Zero voltage turn-off.First capacitor
C1In the second controlled tr tube Q2Dead time before opening is discharged, since what is utilized is the first sustained diodeq1, because
This is without additional configuration discharge path.
Figure 12 is that ac output voltage is negative half-cycle, first capacitor C1Electric discharge terminates, the second diode D2Work before conducting
Make schematic diagram.Figure 13 is that ac output voltage is negative half-cycle, the second diode D2Operation schematic diagram when conducting.First capacitor
C1After electric discharge terminates, the first sustained diodeq1And second sustained diodeq2Start afterflow conducting, controllably due to second
Switching tube Q2Both end voltage be clamped, realize the second controlled tr tube Q2No-voltage it is open-minded.And the first inductance L's sets
It sets, so that the first sustained diodeq1, the second sustained diodeq2And the second diode D2Current changing rate it is limited, work
Make in Sofe Switch state.
Figure 14 is that ac output voltage is negative half-cycle, the 4th controlled tr tube Q4Before conducting, the electric current of the first inductance L is big
The operation schematic diagram of the small size of current for reaching exchange outlet side.Figure 15 is that ac output voltage is negative half-cycle, and the 4th is controllable
Switching tube Q4Conducting, the second diode D2Operation schematic diagram when conducting.Second controlled tr tube Q2From conducting conversion to cut-off
In the process, since its both end voltage is by first capacitor C1Clamper, and pass through the second controlled tr tube Q without electric current2, therefore second
Controlled tr tube Q2Realize no-voltage, zero-current switching.And the 4th controlled tr tube Q4From when cut-off conversion to conducting due to the
One inductance L is load current power supply, so that then flowing through the 4th controlled tr tube Q4Electric current be zero, and current changing rate has
Limit, it is achieved that the 4th controlled tr tube Q4Zero current turning-on.
It should be noted that being said so that the circuit of the application works in inverter mode as an example in aforementioned embodiments
Bright, the scheme of the application can be also used for rectifying, and the Sofe Switch of each device in circuit equally may be implemented, herein no longer
It repeats.
Using technical solution provided by the embodiment of the present invention, comprising: first end and the first end of the first energy-storage travelling wave tube connect
It connects, the first end of second end and second switch device, the first switch device that the cathode of first diode is all connected with；Second end with
The second switch device of the first end connection of third switching device；The first end of second end and the 4th switching device, the two or two pole
The third switching device that the anode of pipe is all connected with；The 4th switching device that second end is connect with the second end of the second energy-storage travelling wave tube；
It include a controlled tr tube and a diode, the cathode of the diode and the controllable switch portion in four switching devices
The first end of part connects, as the first end of corresponding switching device, the of the anode of the diode and the controllable switch component
The connection of two ends, the second end as the switching device；The second energy storage member that first end is connect with the second end of the first energy-storage travelling wave tube
Part；First energy-storage travelling wave tube；First diode；Second diode；First end is connect with the second end of the first energy-storage travelling wave tube, second end
The first inductance being connect with the anode of first diode；Capacitive element；Capacitive element includes: first end and first switch device
Second end connection, the first capacitor that second end is connect with the second end of second switch device；First end and third switching device
First end connection, the second capacitor that second end is connect with the first end of the 4th switching device；Or capacitive element includes: first end
It is connect with the second end of first switch device, the target capacitance that second end is connect with the first end of the 4th switching device.
In the scheme of the application, Sofe Switch, also, the application is may be implemented in each controllable switch device and diode
Scheme only need on the basis of original three level-conversion circuit of I type, increase the first inductance and capacitive element, and capacitor
Component includes a target capacitance, or including first capacitor and the second capacitor, required number of devices is few, is effectively reduced
Cost, improves circuit reliability.
Compared to I type three-level soft switch circuit above-mentioned, present invention also provides a kind of three-phase translation circuit, the three-phases
Translation circuit may include: the first translation circuit, the second translation circuit and third translation circuit；First translation circuit, second
The middle line of translation circuit and third translation circuit is connected with each other, the first translation circuit, the second translation circuit and third transformation
Circuit may each comprise the I type three-level soft switch circuit in any of the above-described embodiment.It should be noted that in three phase inversions electricity
Lu Zhong, the first translation circuit, the second translation circuit and third translation circuit can share same first energy-storage travelling wave tube and be total to
With same second energy-storage travelling wave tube, there can also be respective corresponding energy-storage travelling wave tube, have no effect on implementation of the invention.
The present invention also provides a kind of converter plant, which may include the I type three in any of the above-described embodiment
Level soft switch circuit can correspond to each other reference with above.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand technical solution of the present invention and its core concept.It should be pointed out that for the common of the art
, without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention for technical staff, these
Improvement and modification are also fallen within the protection scope of the claims of the present invention.
Claims (10)
1. a kind of I type three-level soft switch circuit characterized by comprising
First end is connect with the first end of the first energy-storage travelling wave tube, the first end of second end and second switch device, first diode
The first switch device that is all connected with of cathode；
The second switch device that second end is connect with the first end of third switching device；
The first end of second end and the 4th switching device, the third switching device that the anode of the second diode is all connected with；
The 4th switching device that second end is connect with the second end of the second energy-storage travelling wave tube；
It include a controlled tr tube and a diode in four switching devices, the cathode of the diode is controllably opened with this
The first end connection for closing component, as the first end of corresponding switching device, the anode of the diode and the controllable switch component
Second end connection, the second end as the switching device；
Second energy-storage travelling wave tube that first end is connect with the second end of first energy-storage travelling wave tube；
First energy-storage travelling wave tube；
The first diode；
Second diode；
First end is connect with the second end of first energy-storage travelling wave tube, second end connect with the anode of the first diode
One inductance；
Capacitive element；
The capacitive element includes:
First end is connect with the second end of the first switch device, and second end is connect with the second end of the second switch device
First capacitor；
First end is connect with the first end of the third switching device, and second end is connect with the first end of the 4th switching device
The second capacitor；
Or the capacitive element includes:
First end is connect with the second end of the first switch device, and second end is connect with the first end of the 4th switching device
Target capacitance.
2. I type three-level soft switch circuit according to claim 1, which is characterized in that first energy-storage travelling wave tube is the
Three capacitors, first end of the first end of the third capacitor as first energy-storage travelling wave tube, the second end of the third capacitor
Second end as first energy-storage travelling wave tube.
3. I type three-level soft switch circuit according to claim 2, which is characterized in that second energy-storage travelling wave tube is the
Four capacitors, first end of the first end of the 4th capacitor as second energy-storage travelling wave tube, the second end of the 4th capacitor
Second end as second energy-storage travelling wave tube.
4. I type three-level soft switch circuit according to claim 1, which is characterized in that first energy-storage travelling wave tube is the
One DC source, second energy-storage travelling wave tube are the second DC source.
5. I type three-level soft switch circuit according to claim 1, which is characterized in that controllable in four switching devices
Switching tube is IGBT pipe.
6. I type three-level soft switch circuit according to claim 1, which is characterized in that controllable in four switching devices
Switching tube is the metal-oxide-semiconductor without body diode.
7. I type three-level soft switch circuit according to claim 5 or 6, which is characterized in that two in four switching devices
Pole pipe is Schottky diode.
8. I type three-level soft switch circuit according to claim 1, which is characterized in that the first switch device, it is described
Second switch device, the third switching device and the 4th switching device are the metal-oxide-semiconductor with body diode.
9. a kind of three-phase translation circuit characterized by comprising the first translation circuit, the second translation circuit and third transformation
Circuit；
The middle line of first translation circuit, second translation circuit and the third translation circuit is connected with each other, described
First translation circuit, second translation circuit and the third translation circuit include such as any one of claim 1 to 8 institute
The I type three-level soft switch circuit stated.
10. a kind of converter plant, which is characterized in that including I type three-level soft switch as claimed in any one of claims 1 to 8
Circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811355319.0A CN109361323B (en) | 2018-11-14 | 2018-11-14 | I-type three-level soft switching circuit and corresponding three-phase conversion circuit and converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811355319.0A CN109361323B (en) | 2018-11-14 | 2018-11-14 | I-type three-level soft switching circuit and corresponding three-phase conversion circuit and converter |
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| CN109361323A true CN109361323A (en) | 2019-02-19 |
| CN109361323B CN109361323B (en) | 2020-05-15 |
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| CN109361323B (en) | 2020-05-15 |
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