CN209313730U - Single-phase five level AC-AC converter based on three-winding transformer - Google Patents
Single-phase five level AC-AC converter based on three-winding transformer Download PDFInfo
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- CN209313730U CN209313730U CN201920284368.3U CN201920284368U CN209313730U CN 209313730 U CN209313730 U CN 209313730U CN 201920284368 U CN201920284368 U CN 201920284368U CN 209313730 U CN209313730 U CN 209313730U
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Abstract
The utility model discloses a kind of single-phase five level AC-AC converter based on three-winding transformer, including sequentially connected alternating current input power supplying, input partial pressure unit, five level translation units, output filter and AC load；The five level translations unit includes the first four-quadrant switches pipe, the second four-quadrant switches pipe, third four-quadrant switches pipe, the 4th four-quadrant switches pipe, the 5th four-quadrant switches pipe, the 6th four-quadrant switches pipe, the 7th four-quadrant switches pipe, the 8th four-quadrant switches pipe and three-winding transformer.The utility model had not only been able to achieve the purpose of switch tube voltage stress reduction, but also can guarantee that output voltage can be adjusted in full duty cycle range.
Description
Technical field
The utility model relates to Technics of Power Electronic Conversion technical fields, and in particular to a kind of based on the single-phase of three-winding transformer
Five level AC-AC converters.
Background technique
AC-AC converter technique is power application electronic device, the AC energy of a certain frequency and amplitude is converted to another
The converter technique of the AC energy of frequency and amplitude.By being up to the fast development of over half a century, it is widely used to need
The every field of transformation of electrical energy.In the low power electricity consumption occasion of low pressure, many aspects of power electronic technique have been graduallyd mature；And
Just become current research emphasis and hot spot in the application of the power transmission and distribution and industrial occasions of high-power, power electronic technique,
It is limited by power electronic devices pressure voltage, multilevel converter is at solving the problems, such as this effective way.
So far, the basic structure of multi-level converter mainly has diode-clamped multi-level converter, flies across electricity
Hold clamping multilevel converter and independent current source cascade multi-level converter, they all have topological structure and control strategy
Complicated disadvantage.
Summary of the invention
The goal of the invention of the utility model is to provide a kind of single-phase five level AC-AC transformation based on three-winding transformer
Device, had not only been able to achieve the purpose of switch tube voltage stress reduction, but also can guarantee that output voltage can be adjusted in full duty cycle range.
To achieve the above object of the invention, the technical solution adopted in the utility model is: a kind of based on three-winding transformer
Single-phase five level AC-AC converter, including sequentially connected alternating current input power supplying, input partial pressure unit, five level translation units,
Output filter and AC load；
The input partial pressure unit includes the first derided capacitors and the second derided capacitors being connected in series, first partial pressure
The capacitance of capacitor and the capacitance of the second derided capacitors are equal, and one end of first derided capacitors is connected to alternating current input power supplying
First exit point, the other end of first derided capacitors be connected to one end of the second derided capacitors and with the second derided capacitors
Between form first node, the other end of second derided capacitors is connected to the second output terminal point of alternating current input power supplying；
The five level translations unit is opened including the first four-quadrant switches pipe, the second four-quadrant switches pipe, third four-quadrant
Guan Guan, the 4th four-quadrant switches pipe, the 5th four-quadrant switches pipe, the 6th four-quadrant switches pipe, the 7th four-quadrant switches pipe, the 8th
Four-quadrant switches pipe and three-winding transformer；
The first four-quadrant switches pipe and the second four-quadrant switches pipe connect to form the first transformation branch, and described first
Second node is formed between four-quadrant switches pipe and the second four-quadrant switches pipe；The third four-quadrant switches pipe and the 4th four-quadrant
Limit switching tube connects to form the second transformation branch, and is formed between the third four-quadrant switches pipe and the 4th four-quadrant switches pipe
Third node；The 5th four-quadrant switches pipe and the 6th four-quadrant switches pipe connect to form third transformation branch, and described the
Fourth node is formed between five four-quadrant switches pipes and the 6th four-quadrant switches pipe；The 7th four-quadrant switches pipe and the eight or four
Quadrant switches pipe connects to form the 4th transformation branch, and shape between the 7th four-quadrant switches pipe and the 8th four-quadrant switches pipe
At the 5th node；The 6th node is formed between the second four-quadrant switches pipe and third four-quadrant switches pipe；Described 4th 4
The 7th node is formed between quadrant switches pipe and the 5th four-quadrant switches pipe；The 6th four-quadrant switches pipe and the 7th four-quadrant
The 8th node is formed between switching tube；
The first node is connected to the 7th node；
One end of the first transformation branch is connected to the first exit point of alternating current input power supplying, the first transformation branch
The other end on road is connected to one end of the second transformation branch, and the other end of the second transformation branch is connected to third transformation branch
One end, the other end of third transformation branch is connected to one end of the 4th transformation branch, the 4th transformation branch it is another
One end is connected to the second output terminal point of alternating current input power supplying；
The both ends of the primary side winding of the three-winding transformer be separately connected alternating current input power supplying the first exit point and
First vice-side winding of second output terminal point, the three-winding transformer is in parallel with first capacitor, and the three-winding transformer
The both ends of the first vice-side winding be separately connected second node and third node, the second vice-side winding of the three-winding transformer
It is in parallel with the second capacitor, and the both ends of the second vice-side winding of the three-winding transformer are separately connected fourth node and Section five
Point.
In above-mentioned technical proposal, the first four-quadrant switches pipe includes the first power switch tube and second of differential concatenation
Power switch tube；
The second four-quadrant switches pipe includes the third power switch tube and the 4th power switch tube of differential concatenation；
The third four-quadrant switches pipe includes the 5th power switch tube and the 6th power switch tube of differential concatenation；
The 4th four-quadrant switches pipe includes the 7th power switch tube and the 8th power switch tube of differential concatenation；
The 5th four-quadrant switches pipe includes the 9th power switch tube and the tenth power switch tube of differential concatenation；
The 6th four-quadrant switches pipe includes the 11st power switch tube and the 12nd power switch tube of differential concatenation；
The 7th four-quadrant switches pipe includes the 13rd power switch tube and the 14th power switch tube of differential concatenation；
The 8th four-quadrant switches pipe includes the 15th power switch tube and the 16th power switch tube of differential concatenation.
In above-mentioned technical proposal, first power switch tube, the second power switch tube, third power switch tube, the 4th
Power switch tube, the 5th power switch tube, the 6th power switch tube, the 7th power switch tube, the 8th power switch tube, the 9th function
Rate switching tube, the tenth power switch tube, the 11st power switch tube, the 12nd power switch tube, the 13rd power switch tube,
14 power switch tubes, the 15th power switch tube and the 16th power switch tube are IGBT switching tube or switch mosfet
Pipe.It should be noted that each power switch tube above can also be other kinds of switching tube.
In above-mentioned technical proposal, the output filter includes output inductor and output filter capacitor.
In above-mentioned technical proposal, the primary side winding of the three-winding transformer and the first vice-side winding and the second vice-side winding
Turn ratio be 4:1.
In above-mentioned technical proposal, it is first defeated to be connected respectively to alternating current input power supplying for the Same Name of Ends of the three-winding transformer
Endpoint, second node and fourth node out.
In above-mentioned technical proposal, the control signal phase of the first four-quadrant switches pipe and the 8th four-quadrant switches pipe
It controls signal phase and differs 90 °；The control of the control signal phase and the 7th four-quadrant switches pipe of the second four-quadrant switches pipe
Signal phase processed differs 90 °；The control of the control signal phase and the 6th four-quadrant switches pipe of the third four-quadrant switches pipe
Signal phase differs 90 °；The control of the control signal phase and the 5th four-quadrant switches pipe of the 4th four-quadrant switches pipe is believed
Numbers 90 ° of phase phase difference；
The control signal phase of the control signal phase and the 4th four-quadrant switches pipe of the first four-quadrant switches pipe is mutual
It mends；The control signal phase of the second four-quadrant switches pipe is complementary with the control signal phase of third four-quadrant switches pipe；Institute
The control signal phase for stating the 5th four-quadrant switches pipe is complementary with the control signal phase of the 8th four-quadrant switches pipe；Described 6th
The control signal phase of four-quadrant switches pipe is complementary with the control signal phase of the 7th four-quadrant switches pipe.
Since above-mentioned technical proposal is used, the utility model has the advantage that compared with prior art
1. the utility model can be realized the mesh of switch tube voltage stress reduction by the clamping action of three-winding transformer
's；Further through multiple transformation branches are arranged, it can guarantee that output voltage can be adjusted in full duty cycle range；
2. the utility model replaces clamp diode or striding capacitance using three-winding transformer, diode can be avoided
The neutral balance of clamped five-level AC-AC converter and the control problem of striding capacitance voltage, and three-winding transformer exports
Voltage value all meets 1/4 times of input voltage, can guarantee that output voltage can be adjusted in full duty cycle range, therefore without to winged
It is controlled across capacitance voltage or diode neutral point clamp voltage, simplifies the control plan of five level Buck type AC-AC converters
Slightly.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model embodiment one.
When Fig. 2 is the duty ratio D < 0.25 of the utility model embodiment one, switching tube timing and main waveform diagram；
When Fig. 3 is duty ratio 0.25≤D < 0.5 of the utility model embodiment one, switching tube timing and main waveform diagram；
When Fig. 4 is duty ratio 0.5≤D < 0.75 of the utility model embodiment one, switching tube timing and main waveform diagram；
When Fig. 5 is the 0.75≤D of duty ratio of the utility model embodiment one, switching tube timing and main waveform diagram.
Specific embodiment
The utility model is further described with reference to the accompanying drawings and embodiments:
Embodiment one:
It is shown in Figure 1, a kind of single-phase five level AC-AC converter based on three-winding transformer, including be sequentially connected
Alternating current input power supplying ui, input partial pressure unit, five level translation units, output filter and AC load Zo；Wherein, described
Five level translation units and alternating current input power supplying ui, for input voltage to be changed into 0,1/4,1/2,3/4,1 in its outlet side
Five kinds of level of times input voltage；Output filter is used to filter out the higher hamonic wave in five level translation units, and negative with exchanging
Carry ZoConnection is AC load ZoThe output voltage waveforms of high quality are provided；Specifically:
The input partial pressure unit includes the first derided capacitors C being connected in seriesf1With the second derided capacitors Cf2, described
One derided capacitors Cf1Capacitance and the second derided capacitors Cf2Capacitance it is equal, the first derided capacitors Cf1One end be connected to
Alternating current input power supplying uiThe first exit point o1, the first derided capacitors Cf1The other end be connected to the second derided capacitors Cf2
One end and with the second derided capacitors Cf2Between formed first node C, the second derided capacitors Cf2The other end be connected to friendship
Flow input power uiSecond output terminal point o2；
The five level translations unit includes the first four-quadrant switches pipe S1, the second four-quadrant switches pipe S2, third four-quadrant
Switching tube S3, the 4th four-quadrant switches pipe S4, the 5th four-quadrant switches pipe S5, the 6th four-quadrant switches pipe S6, the 7th four-quadrant opens
Close pipe S7, the 8th four-quadrant switches pipe S8With three-winding transformer T；
The first four-quadrant switches pipe S1With the second four-quadrant switches pipe S2Series connection forms the first transformation branch, and described
First four-quadrant switches pipe S1With the second four-quadrant switches pipe S2Between formed second node B12；The third four-quadrant switches pipe
S3With the 4th four-quadrant switches pipe S4Series connection forms the second transformation branch, and the third four-quadrant switches pipe S3With the 4th four-quadrant
Limit switching tube S4Between formed third node B34；The 5th four-quadrant switches pipe S5With the 6th four-quadrant switches pipe S6Series connection shape
Branch, and the 5th four-quadrant switches pipe S are converted at third5With the 6th four-quadrant switches pipe S6Between form fourth node
B56；The 7th four-quadrant switches pipe S7With the 8th four-quadrant switches pipe S8Series connection forms the 4th transformation branch, and the described 7th
Four-quadrant switches pipe S7With the 8th four-quadrant switches pipe S8Between formed the 5th node B78；The second four-quadrant switches pipe S2With
Third four-quadrant switches pipe S3Between formed the 6th node A；The 4th four-quadrant switches pipe S4With the 5th four-quadrant switches pipe S5
Between formed the 7th node E；The 6th four-quadrant switches pipe S6With the 7th four-quadrant switches pipe S7Between formed the 8th node B；
The first node C is connected to the 7th node E；
One end of the first transformation branch is connected to alternating current input power supplying uiThe first exit point o1, described first becomes
The other end for changing branch is connected to one end of the second transformation branch, and the other end of the second transformation branch is connected to third transformation
One end of branch, the other end of the third transformation branch are connected to one end of the 4th transformation branch, the 4th transformation branch
The other end be connected to alternating current input power supplying uiSecond output terminal point o2；
The both ends of the primary side winding of the three-winding transformer T are separately connected alternating current input power supplying uiThe first exit point
The first vice-side winding of o1 and second output terminal point o2, the three-winding transformer T and first capacitor Cf3Parallel connection, and described three around
The both ends of the first vice-side winding of group transformer T are separately connected second node B12With third node B34, the three-winding transformer
The second vice-side winding of T and the second capacitor Cf4Parallel connection, and the both ends of the second vice-side winding of the three-winding transformer T connect respectively
Meet fourth node B56With the 5th node B78。
In the present embodiment, the first four-quadrant switches pipe S1The first power switch tube S including differential concatenation1aWith second
Power switch tube S1b；
The second four-quadrant switches pipe S2Third power switch tube S including differential concatenation2aWith the 4th power switch tube
S2b；
The third four-quadrant switches pipe S3The 5th power switch tube S including differential concatenation3aWith the 6th power switch tube
S3b；
The 4th four-quadrant switches pipe S4The 7th power switch tube S including differential concatenation4aWith the 8th power switch tube
S4b；
The 5th four-quadrant switches pipe S5The 9th power switch tube S including differential concatenation5aWith the tenth power switch tube
S5b；
The 6th four-quadrant switches pipe S6The 11st power switch tube S including differential concatenation6aIt is opened with the 12nd power
Close pipe S6b；
The 7th four-quadrant switches pipe S7The 13rd power switch tube S including differential concatenation7aIt is opened with the 14th power
Close pipe S7b；
The 8th four-quadrant switches pipe S8The 15th power switch tube S including differential concatenation8aIt is opened with the 16th power
Close pipe S8b；
The four-quadrant switches pipe designed above is able to bear positive, reversed voltage stress and current stress, has two-way
Block function.
Specifically, first power switch tube S1aEmitter be connected to the second power switch tube S1bEmitter, institute
State the first power switch tube S1aCollector be connected to alternating current input power supplying uiThe first exit point o1, second power opens
Close pipe S1bCollector be connected to second node B12；
The third power switch tube S2aEmitter be connected to the 4th power switch tube S2bEmitter, the third
Power switch tube S2aCollector be connected to second node B12, the 4th power switch tube S2bCollector be connected to the 6th
Node A；
5th power switch tube S3aEmitter be connected to the 6th power switch tube S3bEmitter, the described 5th
Power switch tube S3aCollector be connected to the 6th node A, the 6th power switch tube S3bCollector be connected to third section
Point B34；
7th power switch tube S4aEmitter be connected to the 8th power switch tube S4bEmitter, the described 7th
Power switch tube S4aCollector be connected to third node B34, the 8th power switch tube S4bCollector be connected to the 7th
Node E；
9th power switch tube S5aEmitter be connected to the tenth power switch tube S5bEmitter, the described 9th
Power switch tube S5aCollector be connected to the 7th node E, the tenth power switch tube S5bCollector be connected to Section four
Point B56；
11st power switch tube S6aEmitter be connected to the 12nd power switch tube S6bEmitter, it is described
11st power switch tube S6aCollector be connected to fourth node B56, the 12nd power switch tube S6bCollector connect
It is connected to the 8th node B；
13rd power switch tube S7aEmitter be connected to the 14th power switch tube S7bEmitter, it is described
13rd power switch tube S7aCollector be connected to the 8th node B, the 14th power switch tube S7bCollector connection
To the 5th node B78；
15th power switch tube S8aEmitter be connected to the 16th power switch tube S8bEmitter, it is described
15th power switch tube S8aCollector be connected to the 5th node B78, the 16th power switch tube S8bCollector connect
It is connected to alternating current input power supplying uiSecond output terminal point o2.
In the present embodiment, first power switch tube S1a, the second power switch tube S1b, third power switch tube S2a,
Four power switch tube Ss2b, the 5th power switch tube S3a, the 6th power switch tube S3b, the 7th power switch tube S4a, the 8th power opens
Close pipe S4b, the 9th power switch tube S5a, the tenth power switch tube S5b, the 11st power switch tube S6a, the 12nd power switch tube
S6b, the 13rd power switch tube S7a, the 14th power switch tube S7b, the 15th power switch tube S8aWith the 16th power switch
Pipe S8bIt is IGBT switching tube, however the utility model is not limited in that switch mosfet can also be used using IGBT switching tube
Pipe etc. is replaced, by taking switch mosfet pipe as an example, at this point, the source electrode of switch mosfet pipe corresponds to the transmitting of IGBT switching tube
Pole, the collector of the corresponding IGBT switching tube of the drain electrode of switch mosfet pipe.
In the present embodiment, the output filter includes output inductor LfWith output filter capacitor Cf。
In the present embodiment, the circle of the primary side winding of the three-winding transformer and the first vice-side winding and the second vice-side winding
Number ratio is 4:1, is used for the first four-quadrant switches pipe S1, the second four-quadrant switches pipe S2, third four-quadrant switches pipe S3,
Four four-quadrant switches pipe S4, the 5th four-quadrant switches pipe S5, the 6th four-quadrant switches pipe S6, the 7th four-quadrant switches pipe S7With
Eight four-quadrant switches pipe S8Voltage stress clamp in 1/4 times, 1/2 times and 3/4 times input voltage.
In the present embodiment, the Same Name of Ends of the three-winding transformer is connected respectively to the first output end of alternating current input power supplying
Point o1, second node B12With fourth node B56。
In the present embodiment, the first four-quadrant switches pipe S1Control signal phase and the 8th four-quadrant switches pipe S8's
It controls signal phase and differs 90 °；The second four-quadrant switches pipe S2Control signal phase and the 7th four-quadrant switches pipe S7's
It controls signal phase and differs 90 °；The third four-quadrant switches pipe S3Control signal phase and the 6th four-quadrant switches pipe S6's
It controls signal phase and differs 90 °；The 4th four-quadrant switches pipe S4Control signal phase and the 5th four-quadrant switches pipe S5's
It controls signal phase and differs 90 °；
The first four-quadrant switches pipe S1Control signal phase and the 4th four-quadrant switches pipe S4Control signal phase
It is complementary；The second four-quadrant switches pipe S2Control signal phase and third four-quadrant switches pipe S3Control signal phase it is mutual
It mends；The 5th four-quadrant switches pipe S5Control signal phase and the 8th four-quadrant switches pipe S8Control signal phase it is complementary；
The 6th four-quadrant switches pipe S6Control signal phase and the 7th four-quadrant switches pipe S7Control signal phase it is complementary.
The converter of the above structure, three-winding transformer T secondary voltage u2=u3=ui/ 4, according to converter duty ratio D's
Difference, converter working condition can be divided into tetra- kinds of D < 0.25,0.25≤D < 0.5,0.5≤D < 0.75 and 0.75≤D situations,
With input voltage uiWith inductive current iLf(u for being all greater than zeroiFor timing, switching tube S1b、S2b、S3b、S4b、S5b、S6b、S7b、S8b
Perseverance conducting；uiWhen being negative, switching tube S1a、S2a、S3a、S4a、S5b、S6b、S7b、S8bPerseverance conducting), specific as follows:
It is shown in Figure 2 as D < 0.25:
(1) 1 [t of mode is switched0, t1]
t0Moment, switching tube S1a、S3a、S5a、S6aConducting, S2a、S4a、S7a、S8aShutdown.In power supply uiUnder effect, inductance Lf
Store energy, electric current iLfIt is linearly increasing.A, E two o'clock pressure drop uAE=ui/ 4, E, B two o'clock pressure drop uEB=0, A, B two o'clock pressure drop uAB
=ui/4。
(2) 2 [t of mode is switched1, t2]
t1Moment, switching tube S3a、S4a、S5a、S6aConducting, S1a、S2a、S7a、S8aShutdown.Inductance LfIt releases energy, electric current
iLfIt is linear to reduce.A, E two o'clock pressure drop uAE=0, E, B two o'clock pressure drop uEB=0, A, B two o'clock pressure drop uAB=0.
(3) 3 [t of mode is switched2, t3]
t2Moment, switching tube S3a、S4a、S6a、S8aConducting, S1a、S2a、S5a、S7aShutdown.A, E two o'clock pressure drop uAE=0, E, B
Two o'clock pressure drop uEB=ui/ 4, A, B two o'clock pressure drop uAB=ui/4。
(4) 4 [t of mode is switched3, t4]
t3Moment, switching tube S3a、S4a、S5a、S6aConducting, S1a、S2a、S7a、S8aShutdown, the course of work is the same as mode 2.
(5) 5 [t of mode is switched4, t5]
t4Moment, switching tube S2a、S4a、S5a、S6aConducting, S1a、S3a、S7a、S8aShutdown, the course of work is the same as mode 1.
(6) 6 [t of mode is switched5, t6]
t5Moment, switching tube S3a、S4a、S5a、S6aConducting, S1a、S2a、S7a、S8aShutdown, the course of work is the same as mode 2.
(7) 7 [t of mode is switched6, t7]
t6Moment, switching tube S3a、S4a、S5a、S7aConducting, S1a、S2a、S6a、S8aShutdown, the course of work is the same as mode 3.
(8) 8 [t of mode is switched7, t8]
t7Moment, switching tube S3a、S4a、S5a、S6aConducting, S1a、S2a、S7a、S8aShutdown, the course of work is the same as mode 2.
It is shown in Figure 3 as 0.25≤D < 0.5:
(1) 9 [t of mode is switched8, t9]
t8Moment, switching tube S1a、S3a、S5a、S7aConducting, S2a、S4a、S6a、S8aShutdown.In power supply uiUnder effect, inductance Lf
Store energy, electric current iLfIt is linearly increasing.A, E two o'clock pressure drop uAE=ui/ 4, E, B two o'clock pressure drop uEB=ui/ 4, A, B two o'clock pressure drop
uAB=ui/2。
(2) 10 [t of mode is switched9, t10]
t9Moment, switching tube S1a、S3a、S5a、S6aConducting, S2a、S4a、S7a、S8aShutdown.Inductance LfIt releases energy, electric current
iLfIt is linear to reduce.A, E two o'clock pressure drop uAE=ui/ 4, E, B two o'clock pressure drop uEB=0, A, B two o'clock pressure drop uAB=ui/4。
(3) 11 [t of mode is switched10, t11]
t10Moment, switching tube S1a、S3a、S6a、S8aConducting, S2a、S4a、S5a、S7aShutdown.Its course of work is the same as mode 9.
(4) 12 [t of mode is switched11, t12]
t11Moment, switching tube S3a、S4a、S6a、S8aConducting, S1a、S2a、S5a、S7aShutdown, A, E two o'clock pressure drop uAE=0, E, B
Two o'clock pressure drop uEB=ui/ 4, A, B two o'clock pressure drop uAB=ui/4。
(5) 13 [t of mode is switched12, t13]
t12Moment, switching tube S2a、S4a、S6a、S8aConducting, S1a、S3a、S5a、S7aShutdown, the course of work is the same as mode 9.
(6) 14 [t of mode is switched13, t14]
t13Moment, switching tube S2a、S4a、S5a、S6aConducting, S1a、S3a、S7a、S8aShutdown, the course of work is the same as mode 10.
(7) 15 [t of mode is switched14, t15]
t14Moment, switching tube S2a、S4a、S5a、S7aConducting, S1a、S3a、S6a、S8aShutdown, the course of work is the same as mode 9.
(8) 16 [t of mode is switched15, t16]
t15Moment, switching tube S3a、S4a、S5a、S7aConducting, S1a、S2a、S6a、S8aShutdown, the course of work is the same as mode 12.
It is shown in Figure 4 as 0.5≤D < 0.75:
(1) 17 [t of mode is switched16, t17]
t16Moment, switching tube S1a、S2a、S5a、S7aConducting, S3a、S4a、S6a、S8aShutdown.In power supply uiUnder effect, inductance Lf
Store energy, electric current iLfIt is linearly increasing.A, E two o'clock pressure drop uAE=ui/ 2, E, B two o'clock pressure drop uEB=ui/ 4, A, B two o'clock pressure drop
uAB=3ui/4。
(2) 18 [t of mode is switched17, t18]
t17Moment, switching tube S1a、S3a、S5a、S7aConducting, S2a、S4a、S6a、S8aShutdown.Inductance LfIt releases energy, electric current
iLfIt is linear to reduce.A, E two o'clock pressure drop uAE=ui/ 4, E, B two o'clock pressure drop uEB=ui/ 4, A, B two o'clock pressure drop uAB=ui/2。
(3) 19 [t of mode is switched18, t19]
t18Moment, switching tube S1a、S3a、S7a、S8aConducting, S2a、S4a、S6a、S7aShutdown.A, E two o'clock pressure drop uAE=ui/ 4,
E, B two o'clock pressure drop uEB=ui/ 2, A, B two o'clock pressure drop uAB=3ui/4。
(4) 20 [t of mode is switched19, t20]
t19Moment, switching tube S1a、S3a、S6a、S8aConducting, S2a、S4a、S5a、S7aShutdown, the course of work is the same as mode 18.
(5) 21 [t of mode is switched20, t21]
t20Moment, switching tube S1a、S2a、S6a、S8aConducting, S3a、S4a、S5a、S7aShutdown, the course of work is the same as mode 17.
(6) 22 [t of mode is switched21, t22]
t21Moment, switching tube S2a、S4a、S6a、S8aConducting, S1a、S3a、S5a、S7aShutdown, the course of work is the same as mode 18.
(7) 23 [t of mode is switched22, t23]
t22Moment, switching tube S2a、S4a、S7a、S8aConducting, S1a、S3a、S5a、S6aShutdown, the course of work is the same as mode 19.
(8) 24 [t of mode is switched23, t24]
t23Moment, switching tube S2a、S4a、S5a、S7aConducting, S1a、S3a、S6a、S8aShutdown, the course of work is the same as mode 18.
It is shown in Figure 5 as 0.75≤D < 1:
(1) 25 [t of mode is switched24, t25]
t24Moment, switching tube S1a、S2a、S7a、S8aConducting, S3a、S4a、S5a、S6aShutdown.In power supply uiUnder effect, inductance Lf
Store energy, electric current iLfIt is linearly increasing.A, E two o'clock pressure drop uAE=ui/ 2, E, B two o'clock pressure drop uEB=ui/ 2, A, B two o'clock pressure drop
uAB=ui。
(2) 26 [t of mode is switched25, t26]
t25Moment, switching tube S1a、S2a、S5a、S7aConducting, S3a、S4a、S6a、S8aShutdown.Inductance LfIt releases energy, electric current
iLfIt is linear to reduce.A, E two o'clock pressure drop uAE=ui/ 2, E, B two o'clock pressure drop uEB=ui/ 4, A, B two o'clock pressure drop uAB=3ui/4。
(3) 27 [t of mode is switched26, t27]
t26Moment, switching tube S1a、S2a、S7a、S8aConducting, S3a、S4a、S5a、S6aShutdown.Its course of work is the same as mode 25.
(4) 28 [t of mode is switched27, t28]
t27Moment, switching tube S1a、S3a、S7a、S8aConducting, S2a、S4a、S5a、S6aShutdown, A, E two o'clock pressure drop uAE=ui/ 4,
E, B two o'clock pressure drop uEB=ui/ 2, A, B two o'clock pressure drop uAB=3ui/4。
(5) 29 [t of mode is switched28, t29]
t28Moment, switching tube S1a、S2a、S7a、S8aConducting, S3a、S4a、S6a、S7aShutdown, the course of work is the same as mode 25.
(6) 30 [t of mode is switched29, t30]
t29Moment, switching tube S1a、S2a、S6a、S8aConducting, S3a、S4a、S5a、S7aShutdown, the course of work is the same as mode 26.
(7) 31 [t of mode is switched30, t31]
t30Moment, switching tube S1a、S2a、S7a、S8aConducting, S3a、S4a、S5a、S6aShutdown, the course of work is the same as mode 25.
(8) 32 [t of mode is switched31, t32]
t31Moment, switching tube S2a、S4a、S7a、S8aConducting, S1a、S3a、S5a、S8aShutdown, the course of work is the same as mode 28.
More than, the single-phase five level AC/AC converter of the utility model had both been able to achieve the mesh of switch tube voltage stress reduction
, and can guarantee that output voltage can be adjusted in full duty cycle range.
In addition, the voltage stress based on switching tube reduces, therefore can be used the switching tube of low pressure resistance and low on-resistance, reduce
Cost and increase power conversion efficiency；Filter inductance electric current and filter capacitor voltage pulse in a switch periods several times, because
This can reduce the volume weight of output filter.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art (such as: can pass through
Exchange input and output position and obtain five lever boosting Boost circuits, and slightly change and obtain Buck-Boost circuit), herein
Defined in General Principle can be real in other embodiments without departing from the spirit or scope of the present utility model
It is existing.Therefore, the present invention will not be limited to the embodiments shown herein, and be to fit to it is disclosed herein
Principle and the consistent widest scope of features of novelty.
Claims (7)
1. a kind of single-phase five level AC-AC converter based on three-winding transformer, it is characterised in that: including sequentially connected friendship
Flow input power, input partial pressure unit, five level translation units, output filter and AC load；
The input partial pressure unit includes the first derided capacitors and the second derided capacitors being connected in series, first derided capacitors
Capacitance and the second derided capacitors capacitance it is equal, one end of first derided capacitors is connected to the first of alternating current input power supplying
Exit point, the other end of first derided capacitors are connected to one end of the second derided capacitors and between the second derided capacitors
First node is formed, the other end of second derided capacitors is connected to the second output terminal point of alternating current input power supplying；
The five level translations unit include the first four-quadrant switches pipe, the second four-quadrant switches pipe, third four-quadrant switches pipe,
4th four-quadrant switches pipe, the 5th four-quadrant switches pipe, the 6th four-quadrant switches pipe, the 7th four-quadrant switches pipe, the 8th four-quadrant
Limit switching tube and three-winding transformer；
The first four-quadrant switches pipe and the second four-quadrant switches pipe connect to form the first transformation branch, and first four-quadrant
Second node is formed between limit switching tube and the second four-quadrant switches pipe；The third four-quadrant switches pipe and the 4th four-quadrant are opened
It closes pipe to connect to form the second transformation branch, and forms third between the third four-quadrant switches pipe and the 4th four-quadrant switches pipe
Node；The 5th four-quadrant switches pipe and the 6th four-quadrant switches pipe connect to form third transformation branch, and the May 4th
Fourth node is formed between quadrant switches pipe and the 6th four-quadrant switches pipe；The 7th four-quadrant switches pipe and the 8th four-quadrant
Switching tube connects to form the 4th transformation branch, and the is formed between the 7th four-quadrant switches pipe and the 8th four-quadrant switches pipe
Five nodes；The 6th node is formed between the second four-quadrant switches pipe and third four-quadrant switches pipe；4th four-quadrant
The 7th node is formed between switching tube and the 5th four-quadrant switches pipe；The 6th four-quadrant switches pipe and the 7th four-quadrant switches
The 8th node is formed between pipe；
The first node is connected to the 7th node；
One end of the first transformation branch is connected to the first exit point of alternating current input power supplying, the first transformation branch
The other end is connected to one end of the second transformation branch, and the other end of the second transformation branch is connected to the one of third transformation branch
End, the other end of the third transformation branch are connected to one end of the 4th transformation branch, the other end of the 4th transformation branch
It is connected to the second output terminal point of alternating current input power supplying；
The both ends of the primary side winding of the three-winding transformer are separately connected the first exit point and second of alternating current input power supplying
First vice-side winding of exit point, the three-winding transformer is in parallel with first capacitor, and the of the three-winding transformer
The both ends of one vice-side winding are separately connected second node and third node, the second vice-side winding of the three-winding transformer and
Two capacitors are in parallel, and the both ends of the second vice-side winding of the three-winding transformer are separately connected fourth node and the 5th node.
2. the single-phase five level AC-AC converter according to claim 1 based on three-winding transformer, it is characterised in that:
The first four-quadrant switches pipe includes the first power switch tube and the second power switch tube of differential concatenation；
The second four-quadrant switches pipe includes the third power switch tube and the 4th power switch tube of differential concatenation；
The third four-quadrant switches pipe includes the 5th power switch tube and the 6th power switch tube of differential concatenation；
The 4th four-quadrant switches pipe includes the 7th power switch tube and the 8th power switch tube of differential concatenation；
The 5th four-quadrant switches pipe includes the 9th power switch tube and the tenth power switch tube of differential concatenation；
The 6th four-quadrant switches pipe includes the 11st power switch tube and the 12nd power switch tube of differential concatenation；
The 7th four-quadrant switches pipe includes the 13rd power switch tube and the 14th power switch tube of differential concatenation；
The 8th four-quadrant switches pipe includes the 15th power switch tube and the 16th power switch tube of differential concatenation.
3. the single-phase five level AC-AC converter according to claim 2 based on three-winding transformer, it is characterised in that:
First power switch tube, the second power switch tube, third power switch tube, the 4th power switch tube, the 5th power switch
Pipe, the 6th power switch tube, the 7th power switch tube, the 8th power switch tube, the 9th power switch tube, the tenth power switch
Pipe, the 11st power switch tube, the 12nd power switch tube, the 13rd power switch tube, the 14th power switch tube, the 15th
Power switch tube and the 16th power switch tube are IGBT switching tube or switch mosfet pipe.
4. the single-phase five level AC-AC converter according to claim 1 based on three-winding transformer, it is characterised in that:
The output filter includes output inductor and output filter capacitor.
5. the single-phase five level AC-AC converter according to claim 1 based on three-winding transformer, it is characterised in that:
The primary side winding of the three-winding transformer and the turn ratio of the first vice-side winding and the second vice-side winding are 4:1.
6. the single-phase five level AC-AC converter according to claim 1 based on three-winding transformer, it is characterised in that:
The Same Name of Ends of the three-winding transformer is connected respectively to the first exit point of alternating current input power supplying, second node and Section four
Point.
7. the single-phase five level AC-AC converter according to claim 1 based on three-winding transformer, it is characterised in that:
The control signal phase of the first four-quadrant switches pipe differs 90 ° with the control signal phase of the 8th four-quadrant switches pipe；Institute
The control signal phase for stating the second four-quadrant switches pipe differs 90 ° with the control signal phase of the 7th four-quadrant switches pipe；It is described
The control signal phase of third four-quadrant switches pipe differs 90 ° with the control signal phase of the 6th four-quadrant switches pipe；Described
The control signal phase of four four-quadrant switches pipes differs 90 ° with the control signal phase of the 5th four-quadrant switches pipe；
The control signal phase of the first four-quadrant switches pipe is complementary with the control signal phase of the 4th four-quadrant switches pipe；Institute
The control signal phase for stating the second four-quadrant switches pipe is complementary with the control signal phase of third four-quadrant switches pipe；Described 5th
The control signal phase of four-quadrant switches pipe is complementary with the control signal phase of the 8th four-quadrant switches pipe；6th four-quadrant
The control signal phase of switching tube is complementary with the control signal phase of the 7th four-quadrant switches pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920284368.3U CN209313730U (en) | 2019-03-06 | 2019-03-06 | Single-phase five level AC-AC converter based on three-winding transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920284368.3U CN209313730U (en) | 2019-03-06 | 2019-03-06 | Single-phase five level AC-AC converter based on three-winding transformer |
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| Publication Number | Publication Date |
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| CN209313730U true CN209313730U (en) | 2019-08-27 |
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| Country | Link |
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2019
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