CN106849663A - A kind of three level power electronic transformer circuit structures - Google Patents
A kind of three level power electronic transformer circuit structures Download PDFInfo
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Abstract
The invention provides a kind of three level powers electronic transformer circuit structure, it is characterised in that including input ac power (ui), LC wave filters (1), three level translation units (2) and output AC power source (uo)；Input ac power (ui) by LC wave filters (1) filtering process sine intermediate level, again by alternating voltage output frequency plot all same between three level translation unit (2) two ends but two kinds of different level of amplitude, both level obtain stablizing adjustable sinusoidal output AC power source (u sinusoidal intermediate level after output filteringo)；LC wave filters (1) are by input filter inductance (Li) and input filter capacitor (Ci) composition, the "+" end connection (u of input filter inductance (Li)i) "+" end, the "-" end connection electric capacity (C of input filter inductance (Li)i) one end；(Ci) the other end (ui) "-" end be connected.
Description
Technical field
The invention belongs to converters technical field, it is related to a kind of three level powers electronic transformer circuit structure.
Background technology
Electric power electric transformer be the AC energy of a certain frequency, amplitude is converted to using power semiconductor it is same or another
The AC energy of frequency, amplitude, applies it in electric power system, can not only improve the quality of power supply but also can improve the stability of a system,
It is now widely used in national defence, industry, power network and daily life.
So far, domestic and international Power Electronic Technique personnel are concentrated mainly on non-electrical and isolate for the research of electric power electric transformer
Formula, low frequency (below 50KHz) and two level high-frequency electrical isolation formula electric power electric transformers, such as Buck types power electronics transformation
Device, AC-AC changing types electric power electric transformer, single-phase flyback AC-AC electric power electric transformers etc., although they respectively have excellent
Point, but shortcoming is also quite obvious：The former is input into no wave filter, it is impossible to suppress Harmonics of Input, centre is without electrical isolation
Link, the stability of a system is poor, and cannot realize frequency conversion；Although both realize high frequency electrical isolation afterwards, comprising device
More, complex structure, the voltage stress of switching tube is high, it is impossible to be applied to high-tension high-power occasion.And for multilevel power
The research of electronic transformer is then considerably less, and the isolated three level powers electronic transformer structure studied at present is only the reduction of out
Close tube voltage stress, and transformer secondary does not realize three level really, and circuit structural limitation in excessive diode and
There is the straight-through phenomenon of bridge wall in the bridge-type tri-level circuit structure of switching tube composition, this circuit structure, greatly reduce system stabilization
Property.
The content of the invention
The present invention proposes a kind of three level powers electronic transformer circuit structure, solves following technical problem：(1) switching tube
Voltage stress is reduced to half during two level；(2) transformer secondary realizes three level；(3) high frequency electrical isolation is realized；(4)
Circuit structure leads directly to problem in the absence of bridge wall.
To achieve these goals, the present invention proposes a kind of three level powers electronic transformer circuit structure, and it has high-frequency electrical
Air bound from, output voltage frequency amplitude is adjustable, low switch tube voltage stress, bidirectional power flow, the level of transformer secondary three etc. are excellent
Point.
The technical solution for realizing the object of the invention is：A kind of three level power electronic transformer circuit structures, it is characterised in that
Including input ac power (ui), LC wave filters (1), three level translation units (2) and output AC power source (uo)；
Input ac power (ui) by LC wave filters (1) filtering process sine intermediate level, sinusoidal intermediate level is passed through again
Alternating voltage output frequency plot all same but two kinds of different level of amplitude between three level translation unit (2) two ends, both electricity
Obtain stablizing adjustable sinusoidal output AC power source (uo) after mean longitude output filtering；
LC wave filters (1) are by input filter inductance (Li) and input filter capacitor (Ci) composition, input filter inductance (Li)
"+" end connection (ui) "+" end, the "-" end connection electric capacity (C of input filter inductance (Li)i) one end；(Ci) it is another
One end (ui) "-" end be connected；
Three level translation units (2) include energy storage inductor (L1), the first capacitance (Ct1), the second capacitance (Ct2),
Recommend full wave type transformer (T), the first output filter capacitor (Cf1), the second output filter capacitor (Cf2), the first bidirectional power
Switching tube (S1), the second two-way power switch pipe (S2), the 3rd two-way power switch pipe (S3), the 4th two-way power switch pipe
(S4),
Recommending full wave type transformer (T) includes four windings, is primary side winding upper and lower ends, 2 ends and 4 between 1 end and 3 ends
It is vice-side winding upper and lower ends to hold, and 5 ends are the centre cap of primary side winding side, and 6 ends are the centre cap of vice-side winding side,
Energy storage inductor (L1) "+" end connection (L1) "-" end, energy storage inductor (L1) "-" end connect the first bidirectional power
Switching tube (S1) input a, while connecting the first capacitance (Ct1) one end, the first capacitance (Ct1) it is another
1 end at end connection transformer (T)；First two-way power switch pipe (S1) output end b connect the second two-way power switch pipe
(S2) input c, while connect transformer (T) 5 ends；
Second two-way power switch pipe (S2) output end d connections (ui) "-" end, while connect the second capacitance (Ct2)
One end；Second capacitance (Ct2) the other end connection transformer (T) 3 ends；
3rd two-way power switch pipe (S3) input e connection transformer (T) 2 ends, the 3rd two-way power switch pipe (S3)
Ausgang connect the first output filter capacitor (Cf1) one end, while connect (uo) "+" end；First output filtered electrical
Hold (Cf1) the other end connection transformer (T) 6 ends, while connect the second output filter capacitor (Cf2) one end；
Second output filter capacitor (Cf2) the other end connect the 4th two-way power switch pipe (S4) output end h, while connecting
Meet (uo) "-" end；4th two-way power switch pipe (S4) input connection transformer (T) 4 ends.
Further, the first two-way power switch pipe (S1) include the first power switch pipe (S1a), the second power switch pipe (S1b)；
The source electrode of the first power switch pipe (S1a) connects the source electrode of the second power switch pipe (S1b), the first power switch pipe (S1a)
Drain electrode be the first two-way power switch pipe (S1) input a, the drain electrode of the second power switch pipe (S1b) is two-way for first
Power switch pipe (S1) output end b.
Further, the 3rd two-way power switch pipe (S3) include the 5th power switch pipe (S3a), the 6th power switch pipe (S3b)；
The source electrode of the 5th power switch pipe (S3a) connects the source electrode of the 6th power switch pipe (S3b), the 5th power switch pipe (S3a)
Drain electrode be the 3rd two-way power switch pipe (S3) input e, the drain electrode of the 6th power switch pipe (S3b) is two-way for the 3rd
Power switch pipe (S3) Ausgang.
Further, the 4th two-way power switch pipe (S4) include the 7th power switch pipe (S4a), the 8th power switch pipe (S4b)；
The source electrode of the 7th power switch pipe (S4a) connects the source electrode of the 8th power switch pipe (S4b), the 8th power switch pipe (S4b)
Drain electrode be the 4th two-way power switch pipe (S4) output end g, the drain electrode of the 7th power switch pipe (S4a) is two-way for the 4th
Power switch pipe (S4) input h.
Three level powers electronic transformer circuit structure proposed by the present invention, with advantages below：(1) voltage stress of switching tube
It is reduced to half during two level；(2) transformer secondary realizes three level；(3) high frequency electrical isolation is realized；(4) circuit electricity
Line structure leads directly to problem in the absence of bridge wall.
The composite can be widely applied in national defence, industry, power network and daily life, for example, have the precision of high request to AC power
Instrument and equipment, intelligent grid, aircraft electrical power supply system etc..
Brief description of the drawings
Accompanying drawing is a kind of three level powers electronic transformer circuit structure structure chart of the invention.
Specific embodiment
With reference to accompanying drawing, a kind of three level powers electronic transformer circuit structure of the invention is by input ac power ui, LC wave filters
1st, three level translation units 2 and output AC power source uo are constituted.Transformer T secondary 2, the exportable three kinds of level in 4 two ends,
It is transformed to obtain stablizing adjustable sinusoidal voltage uo.
LC wave filters 1 are by input filter inductance Li and input filter capacitor CiComposition.The "+" end connection u of inductance Lii"+"
End, inductance Li"-" end connection electric capacity CiOne end, while connecting inductance L1"+" end；CiOther end ui"-"
End is connected.
Three level translation units 2 are by energy storage inductor L1, the first capacitance Ct1, the second capacitance Ct2, recommend full wave type change
(recommend full wave type transformer T includes four windings to depressor T, is primary side winding upper and lower ends, 2 ends and 4 between 1 end and 3 ends
It is vice-side winding upper and lower ends to hold, and 5 ends are the centre cap of primary side winding side, and 6 ends are the centre cap of vice-side winding side),
First output filter capacitor Cf1, the second output filter capacitor Cf2, the first two-way power switch pipe S1, the second two-way power switch
Pipe S2, the 3rd two-way power switch pipe S3, the 4th two-way power switch pipe S4Composition.Energy storage inductor L1"+" end connection Li
"-" end, energy storage inductor L1"-" end connect the first two-way power switch pipe S1Input a, while connecting the first blocking
Electric capacity Ct1One end；First two-way power switch pipe S1Output end b connects the second two-way power switch pipe S2Input c, together
When connection transformer T 5 ends；Second two-way power switch pipe S1Output end connects ui"-" end, while connection second every
Straight electric capacity Ct2One end；First capacitance Ct1Other end connection transformer T 1 end, the second capacitance Ct2It is another
One end connects 3 ends of transformer T；3rd two-way power switch pipe S3Input e connections transformer T 2 ends, the 3rd pair
To power switch tube S3Ausgang connect the first output filter capacitor Cf1One end, while connect uo"+" end；First
Output filter capacitor Cf1Other end connection transformer T 6 ends, while connecting the second output filter capacitor Cf2One end；The
Two output filter capacitor Cf2The other end connect the 4th two-way power switch pipe S4Output end h, while connect uo"-" end；
4th two-way power switch pipe S4Input connection transformer T 4 ends.
First two-way power switch pipe S1Including the first power switch tube S 1a, the second power switch tube S 1b；First power switch
The source electrode of pipe S1a connects the source electrode of the second power switch tube S 1b, and the drain electrode of the first power switch tube S 1a is the first bidirectional power
Switching tube S1Input a, the second power switch tube S 1b drain electrode be the first two-way power switch pipe S1Output end b.
Second two-way power switch pipe S2Including the 3rd power switch tube S 2a, the 4th power switch tube S 2b；3rd power switch
The source electrode of pipe S2a connects the source electrode of the 4th power switch tube S 2b, and the drain electrode of the 3rd power switch tube S 2a is the second bidirectional power
Switching tube S2Input c, the 4th power switch tube S 2b drain electrode be the second two-way power switch pipe S2Output end d.
3rd two-way power switch pipe S3Including the 5th power switch tube S 3a, the 6th power switch tube S 3b；5th power switch
The source electrode of pipe S3a connects the source electrode of the 6th power switch tube S 3b, and the drain electrode of the 5th power switch tube S 3a is the 3rd bidirectional power
Switching tube S3Input e, the 6th power switch tube S 3b drain electrode be the 3rd two-way power switch pipe S3Ausgang.
4th two-way power switch pipe S4Including the 7th power switch tube S 4a, the 8th power switch tube S 4b；7th power switch
The source electrode of pipe S4a connects the source electrode of the 8th power switch tube S 4b, and the drain electrode of the 8th power switch tube S 4b is the 4th bidirectional power
Switching tube S4Output end g, the 7th power switch tube S 4a drain electrode be the 4th two-way power switch pipe S4Input h.
A kind of three level powers electronic transformer circuit structure of the invention is in input ac power uiPositive half cycle when, the first power
Switching tube S1a, the 3rd power switch tube S 2a, the 5th power switch tube S 3a, the 7th power switch tube S 4a conductings；In input
AC power uiNegative half period when, the second power switch tube S 1b, the 4th power switch tube S 2b, the 6th power switch tube S 3b,
8th power switch tube S 4b is turned on.
A kind of operation mode of three level powers electronic transformer circuit structure of the invention is divided into dutycycle D>0.5 and D<0.5 liang
The situation of kind.
D<0.5 operation mode (positive half period)：
(1) operation mode 1：First power switch tube S 1a, the 7th power switch tube S 4a high frequency choppings, the 3rd power switch tube S 2a,
5th power switch tube S 3a is turned off, and the second power switch tube S 1b, the 4th power switch tube S 2b keep normal open, the 6th power
Switching tube S3b, the 8th power switch tube S 4b are normally closed.In this period, inductance L1Energy storage, electric current is through L1, the first power opens
Pipe S1a, the second power switch tube S 1b, T are closed to the second capacitance Ct2Charge, the first capacitance Ct1By the first power
Switching tube S1a, the electric discharge of the second power switch tube S 1b, T, the voltage of transformer secondary sensing give the second capacitance Cf2Charge,
While powering load.At this moment the first level is produced between transformer T secondary 2,4 two ends.
(2) operation mode 2：5th power switch tube S 3a, the 7th power switch tube S 4a high frequency choppings, the first power switch tube S 1a,
3rd power switch tube S 2a is turned off, and the second power switch tube S 1b, the 4th power switch tube S 2b keep normal open, the 6th power
Switching tube S3b, the 8th power switch tube S 4b are normally closed.In this period, inductance L1In electric current decline, the first capacitance
Ct1With the second capacitance Ct2Charge, the energy of transformer T secondary sensing is discharged by loading.At this moment transformer T secondary 2,
Second electrical level is produced between 4 two ends.
(3) operation mode 3：3rd power switch tube S 2a, the 5th power switch tube S 3a high frequency choppings, the first power switch tube S 1a,
7th power switch tube S 4a is turned off, the second power switch tube S 1b, the 4th power switch tube S 2b normal opens, the 6th power switch
Pipe S3b, the 8th power switch tube S 4b are normally closed.During this period, inductance L1In electric current rise, the first capacitance Ct1
Charge, the second capacitance Ct2Discharged by T, the 3rd power switch tube S 2a, the 4th power switch tube S 2b, the first filtering
Electric capacity Cf1Charge, the second filter capacitor Cf2By load discharge.At this moment the first electricity is also produced between transformer T secondary 2,4 two ends
It is flat.
(4) operation mode 4：This operation mode is completely the same with operation mode 2.
In a switch periods, positive-negative half-cycle is symmetrical, and corresponding electric power electric transformer circuit structure is opened at positive and negative half
Working method pattern in the cycle of pass is also symmetrical.ui>When 0, the first power switch tube S 1a, the 3rd power switch tube S 2a,
5th power switch tube S 3a, the 7th power switch tube S 4a high frequency choppings, the second power switch tube S 1b, the 4th power switch pipe
S2b normal opens, the 6th power switch tube S 3b, the 8th power switch tube S 4b are normally closed；ui<When 0, the power switch pipe of switching tube second
S1b, the 4th power switch tube S 2b, the 6th power switch tube S 3b, the 8th power switch tube S 4b high frequency choppings, the first power
Switching tube S1a, the 3rd power switch tube S 2a normal opens, the 5th power switch tube S 3a, the 7th power switch tube S 4a are normally closed.
D>0.5 operation mode (positive half period)：
(1) operation mode 1：First power switch tube S 1a, the 3rd power switch tube S 2a high frequency choppings, the 5th power switch tube S 3a,
7th power switch tube S 4a is turned off, the second power switch tube S 1b, the 4th power switch tube S 2b normal opens, the 6th power switch
Pipe S3b, the 8th power switch tube S 4b are normally closed.In this period, inductance L1Energy storage, inductive current linear rise；First every
Straight electric capacity Ct1, the second capacitance Ct2By the first power switch tube S 1a, the 3rd power switch tube S 2a and transformer T primary sides
Electric discharge, the first filter capacitor Cf1, the second filter capacitor Cf2Power to the load.At this moment, produced between transformer T secondary 2,4 two ends
Raw 3rd level.
(2) operation mode 2：First power switch tube S 1a, the 7th power switch tube S 4a high frequency choppings, the 3rd power switch tube S 2a,
5th power switch tube S 3a is turned off, the second power switch tube S 1b, the 4th power switch tube S 2b normal opens, the 6th power switch
Pipe S3b, the 8th power switch tube S 4b are normally closed.In this period, inductance L1Release energy, inductive current linear decline；Electricity
Flow through L1, the first power switch tube S 1a, the second power switch tube S 1b, T give the second capacitance Ct2Charge, the first blocking electricity
Hold Ct1Discharged by the first power switch tube S 1a, the second power switch tube S 1b, T, the first filter capacitor Cf1Electric discharge, secondary
The voltage of sensing gives the second filter capacitor Cf2Charge, while powering load.At this moment produced between transformer T secondary 2,4 two ends
First level.
(3) operation mode 3：This operation mode is completely the same with operation mode 1.
(4) operation mode 4：3rd power switch tube S 2a, the 5th power switch tube S 3a high frequency choppings, the first power switch tube S 1a,
7th power switch tube S 4a is turned off, the second power switch tube S 1b, the 4th power switch tube S 2b normal opens, the 6th power switch
Pipe S3b, the 8th power switch tube S 4b are normally closed.During this period, inductance L1In electric current decline, electric current give the first blocking
Electric capacity Ct1Charge, the second capacitance Ct2Discharged by T, the 3rd power switch tube S 2a, the 4th power switch tube S 2b, the
One filter capacitor Cf1Charge, the second filter capacitor Cf2Powering load.Also the first electricity is produced between transformer T secondary 2,4 two ends
It is flat.
Work as ui<When 0, mode of operation and ui>It is similar when 0, simply it is corresponding switch mode in change into the second power switch tube S 1b,
4th power switch tube S 2b, the 6th power switch tube S 3b, the 8th power switch tube S 4b high frequencies cut control, the first power switch pipe
S1a, the 3rd power switch tube S 2a normal opens, the 5th power switch tube S 3a, the 7th power switch tube S 4a are normally closed.
A kind of three level powers electronic transformer circuit structure of the invention alternately two kinds of output between transformer T secondary 2,4 two ends
Level, the level obtains stablizing adjustable sinusoidal output after output filtering.The width of dutycycle D when being worked by changing circuit
Degree, you can realize the regulation of output sinusoidal voltage amplitude.
Claims (4)
1. a kind of three level powers electronic transformer circuit structure, it is characterised in that including input ac power (ui), LC filtering
Device (1), three level translation units (2) and output AC power source (uo)；
Input ac power (ui) by LC wave filters (1) filtering process sine intermediate level, sinusoidal intermediate level is passed through again
Alternating voltage output frequency plot all same but two kinds of different level of amplitude between three level translation unit (2) two ends, both electricity
Obtain stablizing adjustable sinusoidal output AC power source (u after mean longitude output filteringo)；
LC wave filters (1) are by input filter inductance (Li) and input filter capacitor (Ci) composition, input filter inductance (Li)
"+" end connection (ui) "+" end, the "-" end connection electric capacity (C of input filter inductance (Li)i) one end；(Ci) it is another
One end (ui) "-" end be connected；
Three level translation units (2) include energy storage inductor (L1), the first capacitance (Ct1), the second capacitance (Ct2),
Recommend full wave type transformer (T), the first output filter capacitor (Cf1), the second output filter capacitor (Cf2), the first bidirectional power
Switching tube (S1), the second two-way power switch pipe (S2), the 3rd two-way power switch pipe (S3), the 4th two-way power switch pipe
(S4),
Recommending full wave type transformer (T) includes four windings, is primary side winding upper and lower ends, 2 ends and 4 between 1 end and 3 ends
It is vice-side winding upper and lower ends to hold, and 5 ends are the centre cap of primary side winding side, and 6 ends are the centre cap of vice-side winding side,
Energy storage inductor (L1) "+" end connection (L1) "-" end, energy storage inductor (L1) "-" end connect the first bidirectional power
Switching tube (S1) input a, while connecting the first capacitance (Ct1) one end, the first capacitance (Ct1) it is another
1 end at end connection transformer (T)；First two-way power switch pipe (S1) output end b connect the second two-way power switch pipe
(S2) input c, while connect transformer (T) 5 ends；
Second two-way power switch pipe (S2) output end d connections (ui) "-" end, while connect the second capacitance (Ct2)
One end；Second capacitance (Ct2) the other end connection transformer (T) 3 ends；
3rd two-way power switch pipe (S3) input e connection transformer (T) 2 ends, the 3rd two-way power switch pipe (S3)
Ausgang connect the first output filter capacitor (Cf1) one end, while connect (uo) "+" end；First output filtered electrical
Hold (Cf1) the other end connection transformer (T) 6 ends, while connect the second output filter capacitor (Cf2) one end；
Second output filter capacitor (Cf2) the other end connect the 4th two-way power switch pipe (S4) output end h, while connecting
Meet (uo) "-" end；4th two-way power switch pipe (S4) input connection transformer (T) 4 ends.
2. three level powers electronic transformer circuit structure according to claim 1, it is characterised in that the first bidirectional power
Switching tube (S1) include the first power switch pipe (S1a), the second power switch pipe (S1b)；
The source electrode of the first power switch pipe (S1a) connects the source electrode of the second power switch pipe (S1b), the first power switch pipe (S1a)
Drain electrode be the first two-way power switch pipe (S1) input a, the drain electrode of the second power switch pipe (S1b) is two-way for first
Power switch pipe (S1) output end b.
3. three level powers electronic transformer circuit structure according to claim 2, it is characterised in that the 3rd bidirectional power
Switching tube (S3) include the 5th power switch pipe (S3a), the 6th power switch pipe (S3b)；5th power switch pipe (S3a)
Source electrode connect the source electrode of the 6th power switch pipe (S3b), the drain electrode of the 5th power switch pipe (S3a) is the 3rd bidirectional power
Switching tube (S3) input e, the drain electrode of the 6th power switch pipe (S3b) is the 3rd two-way power switch pipe (S3) it is defeated
Go out to hold f.
4. three level powers electronic transformer circuit structure according to claim 3, it is characterised in that the 4th bidirectional power
Switching tube (S4) include the 7th power switch pipe (S4a), the 8th power switch pipe (S4b)；7th power switch pipe (S4a)
Source electrode connect the source electrode of the 8th power switch pipe (S4b), the drain electrode of the 8th power switch pipe (S4b) is the 4th bidirectional power
Switching tube (S4) output end g, the drain electrode of the 7th power switch pipe (S4a) is the 4th two-way power switch pipe (S4) it is defeated
Enter to hold h.
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| CN108631326A (en) * | 2018-04-26 | 2018-10-09 | 南京理工大学 | Idle and harmonic compensation device based on Buck type three-level AC AC-AC converters |
| CN110034687A (en) * | 2019-04-18 | 2019-07-19 | 国网江苏省电力有限公司 | A kind of electric power electric transformer |
| CN111464057A (en) * | 2020-04-29 | 2020-07-28 | 武汉大学 | Multilevel single-stage DC/AC converter and implementation method thereof |
| CN115494906A (en) * | 2022-09-19 | 2022-12-20 | 北京大学 | Amplitude and phase adjustable VCSEL alternating current modulation circuit and integrated circuit |
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| CN111464057A (en) * | 2020-04-29 | 2020-07-28 | 武汉大学 | Multilevel single-stage DC/AC converter and implementation method thereof |
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