CN105207459B - A kind of multi-electrical level inverter circuit and its control method - Google Patents

A kind of multi-electrical level inverter circuit and its control method Download PDF

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CN105207459B
CN105207459B CN201510629280.7A CN201510629280A CN105207459B CN 105207459 B CN105207459 B CN 105207459B CN 201510629280 A CN201510629280 A CN 201510629280A CN 105207459 B CN105207459 B CN 105207459B
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electric capacity
switching tube
switch unit
level switch
connection
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CN105207459A (en
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耿后来
申潭
别伟
王鹏
李浩源
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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Abstract

The invention discloses a kind of multi-electrical level inverter circuit and its control method, wherein multi-electrical level inverter circuit includes primary electric capacity inversion unit, the m level switch unit and the first discharge circuit of cascade；The input of primary electric capacity inversion unit is connected with dc source；Level switch unit includes the first electric capacity, first switch pipe and second switch pipe, wherein the first end of the first electric capacity electrically connects with the first end of first switch pipe, second end of the first electric capacity electrically connects with the second end of second switch pipe, first discharge circuit, for the first electric capacity electric discharge in the m level switch unit to cascade, including the first connection end and second connection end.A kind of multi-electrical level inverter circuit provided in an embodiment of the present invention, by increasing simple first discharge circuit between level switch unit, it is multiplexed the main circuit unit of inverter, by controlling the first discharge circuit and the corresponding switching tube action i.e. achievable electric discharge to the flying capacitor, cost is low, simple to operate, reliable.

Description

A kind of multi-electrical level inverter circuit and its control method
Technical field
The present embodiments relate to circuit engineering, and in particular to a kind of multi-electrical level inverter circuit and its control method.
Background technology
At present, multi-electrical level inverter is widely applied in middle pressure Large Copacity occasion, and main cause is multi-level inverse conversion Device topological structure has the advantages that output harmonic wave is small, dynamic response is fast, transmission frequency bandwidth and Electro Magnetic Compatibility are good.
Fig. 1 is a kind of structural representation of multi-electrical level inverter circuit of the prior art, as shown in figure 1, more level Inverter circuit includes primary electric capacity inversion unit 110, and m level switch unit 120 of cascade, and m is more than or equal to 1 Integer, wherein, the input of primary electric capacity inversion unit 110 is connected with dc source, the primary energy of electric capacity inversion unit 110 Enough that dc source is converted into more level ac signals, the primary electric capacity inverter circuit power supply can be by multiple electric capacity and switch Pipe forms, and m level switch unit 120 is mainly used in realizing more level outputs.
In addition, as shown in figure 1, above-mentioned each level switch unit 120 includes the first electric capacity Cm, first switch pipe Q1m With second switch pipe Q2m, wherein the first electric capacity Cm first end electrically connects with first switch pipe Q1m first end, the first electric capacity Cm the second end electrically connects with second switch pipe Q2m first end.Specifically, in the 1st level switch unit 120, it first First output end of the electric capacity C1 first end also with above-mentioned primary electric capacity inversion unit 110 electrically connects, and the second of the first electric capacity C1 The second output end also with above-mentioned primary electric capacity inversion unit 110 is held to electrically connect, in m-th of level switch unit 120, first opens Pipe Q1m the second end and second switch pipe Q2m first end electrical connection are closed, and is connected to the output end of inverter, m >=1；And work as During m >=2, then i-th (1<I≤m) in individual level switch unit 120, the first electric capacity Ci first end and the i-th -1 level switching are single The first switch pipe Q1i of member 120 the second end electrical connection, the first electric capacity Ci the second end and the i-th -1 level switch unit 120 Second switch pipe Q2i first end electrical connection.
In above-mentioned inverter circuit, wherein the first electric capacity Cm, as flying capacitor, voltage needs to reach certain at work Be worth and keep stable, this just need inverter circuit to enter line precharge to flying capacitor before activation with reach operating voltage and Keep stable.But when inverter circuit is stopped, it is also necessary to flying capacitor is discharged, to prevent related work people Member gets an electric shock, it is ensured that safety, but in the prior art without the corresponding discharge technology scheme of offer.
The content of the invention
The present invention provides a kind of multi-electrical level inverter circuit and its control method, using realize in level switch unit as First electric capacity of flying capacitor is discharged.
The embodiment of the present invention provides a kind of multi-electrical level inverter circuit, including：Including primary electric capacity inversion unit, cascade M level switch unit and the first discharge circuit；
The input of the primary electric capacity inversion unit is connected with dc source；
The level switch unit includes the first electric capacity, first switch pipe and second switch pipe, wherein the of the first electric capacity One end electrically connects with the first end of first switch pipe, and the second end of the first electric capacity electrically connects with the second end of second switch pipe, its In, in the 1st level switch unit, the first output end of the first end of its first electric capacity also with the primary electric capacity inversion unit Electrical connection, the second end of the first electric capacity also electrically connect with the above-mentioned primary output end of electric capacity inversion unit second, m-th of level switching In unit, the second end of first switch pipe and the first end electrical connection of second switch pipe, and it is connected to the output end of inverter, m ≥1；And as m >=2, then in m-th of level switch unit, the first end of the first electric capacity and the m-1 level switch unit The second end electrical connection of first switch pipe, the second end of the first electric capacity and the second switch pipe of the m-1 level switch unit First end electrically connects；
First discharge circuit, for the first electric capacity electric discharge in the m level switch unit to cascade, including first Connection end and second connection end, the first connection end of first discharge circuit and the first electric capacity in i-th of level switch unit First end electrical connection, the second connection end of first discharge circuit and the of the first electric capacity in j-th level switch unit Two ends electrically connect, or, the second connection end of first discharge circuit electrically connects with the output end of the inverter；
Wherein described m, i, j are positive integer.
Further, the first connection end of first discharge circuit and the first electric capacity in the 1st level switch unit First end electrically connects, the second connection end of first discharge circuit and second of the first electric capacity in the 1st level switch unit End electrical connection.
Further, first discharge circuit also include being connected on first connection end and the second connection end it Between first switch and the first impedance.
Further, the first switch electrically connects with first connection end, and first impedance connects with described second Connect end electrical connection；Or
The first switch electrically connects with the second connection end, and first impedance is electrically connected with first connection end Connect.
Described first switch is gate-controlled switch tube device, it is preferred that the first switch is relay.
Further, the first connection end of first discharge circuit and the first electric capacity in i-th of level switch unit First end electrically connects, the second connection end of first discharge circuit and the of the first electric capacity in i+1 level switch unit Two ends electrically connect；Or
First connection end of first discharge circuit and the first end of the first electric capacity in i-th of level switch unit are electrically connected Connect, the second connection end of first discharge circuit electrically connects with the second end of the first electric capacity in the i-th -1 level switch unit.
Preferably, the multi-electrical level inverter circuit also includes at least one second discharge circuit, the second electric discharge electricity First connection end on road electrically connects with the first end of the first electric capacity in k-th of level switch unit, second discharge circuit Second connection end electrically connects with the second end of the first electric capacity in k-th of level switch unit, k be less than i, it is and just whole less than j Number.
What second discharge circuit included being connected between first connection end and the second connection end second opens Close and the second impedance.
Further, the first connection end of second discharge circuit and the first electric capacity in the 1st level switch unit First end electrically connects, the second connection end of second discharge circuit and second of the first electric capacity in the 1st level switch unit End electrical connection.
Further, the primary electric capacity inversion unit includes：Second electric capacity, the 3rd electric capacity, the 4th switching tube, the 5th open Guan Guan, the 6th switching tube, the 7th switching tube, the 8th switching tube and the 9th switching tube；
The first end of second electric capacity and the positive pole of the cell panel, and the first end of the 4th switching tube connect Connect, the first end of the second end of second electric capacity and the 3rd electric capacity, and it is the second end of the 6th switching tube, described The first end electrical connection of 7th switching tube；
Second end of the 3rd electric capacity and the negative pole of the cell panel, and the second end of the 9th switching tube are electrically connected Connect；
Second end of the 4th switching tube and the second end of the 5th switching tube, and first level switch The first end electrical connection of first electric capacity in unit；
The first end of 5th switching tube electrically connects with the first end of the 6th switching tube；
Second end of the 7th switching tube and the second end electrical connection of the 8th switching tube, the 8th switching tube The first end of first end and the 9th switching tube, and in first level switch unit the first electric capacity the second end electricity Connection.Or
The first end of second electric capacity and the positive pole of the cell panel, and the first end of the 4th switching tube are electrically connected Connect, the first end of the second end of second electric capacity and the 3rd electric capacity, and it is the second end of the 6th switching tube, described The first end electrical connection of 7th switching tube；Second end of the 3rd electric capacity and the negative pole of the cell panel, and the described 9th The second end electrical connection of switching tube；Second end of the 4th switching tube and the first end of the 5th switching tube, and it is described The first end electrical connection of 6th switching tube；Second end of the 5th switching tube and the first electric capacity in first level switch unit First end electrical connection；Second end of the 7th switching tube and the second end of the 8th switching tube, and the described 9th open Close the first end electrical connection of pipe；The first end of 8th switching tube and the first electric capacity in first level switch unit Second end electrically connects.
Preferably, the primary electric capacity inversion unit includes：Second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 4th switch Pipe, the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th switching tube and the 9th switching tube；
Wherein, the first end of second electric capacity and the positive pole of the cell panel, and the first of the 4th switching tube End electrical connection, the second end of second electric capacity and the first end of the 4th electric capacity, and the second of the 6th switching tube End electrical connection；Second end of the 4th electric capacity and the first end of the 7th switching tube, and the first of the 3rd electric capacity End electrical connection；Second end of the 3rd electric capacity and the negative pole of the cell panel, and the second end electricity of the 9th switching tube Connection；Second end of the 4th switching tube and the second end of the 5th switching tube, and first level switching are single The first end electrical connection of first electric capacity in member；The first end and the first end of the 6th switching tube of 5th switching tube are electrically connected Connect；Second end of the 7th switching tube and the second end electrical connection of the 8th switching tube, the first of the 8th switching tube End and the first end of the 9th switching tube, and the second end of the first electric capacity is electrically connected in first level switch unit Connect；Or
The first end of second electric capacity and the positive pole of the cell panel, and the first end of the 4th switching tube connect Connect, the second end of second electric capacity and the first end of the 4th electric capacity, and the second end of the 6th switching tube are electrically connected Connect；Second end of the 4th electric capacity and the first end of the 7th switching tube, and the first end of the 3rd electric capacity are electrically connected Connect；Second end of the 3rd electric capacity and the negative pole of the cell panel, and the second end electrical connection of the 9th switching tube；Institute The second end of the 4th switching tube and the first end of the 5th switching tube are stated, and the first end of the 6th switching tube is electrically connected Connect；Second end of the 5th switching tube electrically connects with the first end of the first electric capacity in first level switch unit；Institute The second end of the 7th switching tube and the second end of the 8th switching tube are stated, and the first end of the 9th switching tube is electrically connected Connect；The first end of 8th switching tube electrically connects with the second end of the first electric capacity in first level switch unit.
Present invention also offers a kind of control method based on above-mentioned multi-electrical level inverter circuit, including：
First switch pipe, second switch pipe in m level switch unit of control cascade, and the first discharge circuit On and off so that the first electric capacity in m level switch unit of cascade is formed with first discharge circuit to discharge back Discharged on road.
Further, first discharge circuit also include being connected to first connection end and the second connection end it Between first switch and the first impedance, if the first connection end of first discharge circuit and in i-th level switch unit the The first end electrical connection of one electric capacity, the second connection end of first discharge circuit and the first electricity in j-th of level switch unit The the second end electrical connection held, then when discharging the first electric capacity in i-th of level switch unit, control i-th of level switch unit In the first electric capacity the second end into j-th of level switch unit between the second end of the first electric capacity switching tube conducting, And the first switch conducting；When then discharging the first electric capacity in j-th of level switch unit, j-th of level switching is controlled Switching tube of the first end of the first electric capacity into i-th of level switch unit between the first end of the first electric capacity is led in unit It is logical, and first switch conducting, form it into discharge loop；Then in n-th of level switch unit in addition to i-th, j When first electric capacity discharges, the first end of the first electric capacity in n-th of level switch unit is controlled to i-th of level switch unit In the first electric capacity first end between switching tube conducting, the second end of the first electric capacity is to j-th in n-th of level switch unit The switching tube conducting at the second end of the first electric capacity in level switch unit, and first switch conducting, form it into electric discharge Loop, wherein n are the positive integer less than or equal to m.
Further, first discharge circuit also includes being connected in series in first connection end and second connection First switch and the first impedance between end, if the first connection end of first discharge circuit and i-th of level switch unit In the first electric capacity first end electrical connection, the second connection end and the output end of the inverter of first discharge circuit are electrically connected When connecing；When then discharging the first electric capacity in i-th of level switch unit, the first electricity in i-th of level switch unit is controlled The second end held forms it into the switching tube conducting between the output end of the inverter, and first switch conducting Discharge loop；When then discharging the first electric capacity in n-th of level switch unit in addition to i-th, n-th of level switching is controlled Switching tube of the first end of the first electric capacity into i-th of level switch unit between the first end of the first electric capacity is led in unit It is logical, in n-th of level switch unit the second end of the first electric capacity to the switching tube conducting between the output end of the inverter with And the first switch conducting, form it into discharge loop.
A kind of multi-electrical level inverter circuit provided in an embodiment of the present invention, it is single by setting the m level to cascade to switch First discharge circuit of the first electric capacity electric discharge in member, its first connection end and the first electric capacity in i-th of level switch unit First end electrically connects, and second connection end electrically connects with the second end of the first electric capacity in j-th of level switch unit, i ≠ j, or, The second connection end of first discharge circuit electrically connects with the output end of the inverter, in reusable level switch unit Each switching tube, it is that first to being used as flying capacitor can be achieved by controlling the first discharge circuit and the action of corresponding switching tube The electric discharge of electric capacity.And first discharge circuit has the advantages of cost is low, simple to operate, reliable.
Brief description of the drawings
Fig. 1 is a kind of structural representation of multi-electrical level inverter circuit of the prior art；
Fig. 2 is a kind of structural representation for inverter circuit that the embodiment of the present invention one provides；
Fig. 3 is a kind of structural representation one for inverter circuit that the embodiment of the present invention two provides；
Fig. 4 is a kind of structural representation two for inverter circuit that the embodiment of the present invention two provides；
Fig. 5 is a kind of structural representation three for inverter circuit that the embodiment of the present invention two provides；
Fig. 6 is a kind of discharge line schematic diagram one that the embodiment of the present invention two provides；
Fig. 7 is a kind of discharge line schematic diagram two that the embodiment of the present invention two provides；
Fig. 8 is a kind of discharge line schematic diagram one that the embodiment of the present invention three provides；
Fig. 9 is a kind of discharge line schematic diagram two that the embodiment of the present invention three provides；
Figure 10 is a kind of discharge line schematic diagram that the embodiment of the present invention four provides；
Figure 11 is a kind of discharge line schematic diagram one that the embodiment of the present invention five provides；
Figure 12 is a kind of discharge line schematic diagram two that the embodiment of the present invention five provides；
Figure 13 is a kind of electrical block diagram one for primary electric capacity inversion unit that the embodiment of the present invention six provides；
Figure 14 is a kind of electrical block diagram two for primary electric capacity inversion unit that the embodiment of the present invention six provides；
Figure 15 is a kind of electrical block diagram three for primary electric capacity inversion unit that the embodiment of the present invention six provides；
Figure 16 is a kind of electrical block diagram four for primary electric capacity inversion unit that the embodiment of the present invention six provides.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that in order to just Part related to the present invention rather than entire infrastructure are illustrate only in description, accompanying drawing.
Embodiment one
Fig. 2 be the embodiment of the present invention one provide a kind of inverter circuit structural representation, the present embodiment be applied to pair The situation that flying capacitor in multi-electrical level inverter is discharged.As shown in Fig. 2 the multi-electrical level inverter circuit, including it is first Level electric capacity inversion unit 110, the discharge circuit 130 of m level switch unit 120 and first of cascade；
The input of primary electric capacity inversion unit 110 is connected with dc source, and those skilled in that art are appreciated that this In can include situation that primary electric capacity inversion unit 110 and cell panel be directly connected to or in cell panel and primary electrical Booster circuit is set between appearance inversion unit 110.
Level switch unit 120 includes the first electric capacity, first switch pipe and second switch pipe, wherein the first of the first electric capacity End electrically connects with the first end of first switch pipe, and the second end of the first electric capacity electrically connects with the second end of second switch pipe, and has Body, shown in reference picture 2, in the 1st level switch unit 120, its first electric capacity C1 first end also with primary electric capacity inversion The first output end electrical connection of unit 110, the first electric capacity C1 the second end also with above-mentioned primary electric capacity inversion unit 110 second Output end electrically connects, and in m-th of level switch unit, the second end of first switch pipe and the first end of second switch pipe are electrically connected Connect, and be connected to the output end of inverter, m >=1；And as m >=2, then in m-th of level switch unit 120, the first electric capacity Cm First end electrically connected with the first switch pipe Q1 (m-1) of the m-1 level switch unit 120 the second end, the first electric capacity Cm The second end electrically connected with the second switch pipe Q2 (m-1) of the m-1 level switch unit 120 first end；
First discharge circuit 130 is used to discharge to the first electric capacity in m level switch unit of cascade, and it includes first Connection end and second connection end, the first connection end of the first discharge circuit 130 and the first electric capacity Ci in i-th of level switch unit First end electrical connection, the second connection end of the first discharge circuit 130 and the of the first electric capacity Cj in j-th level switch unit Two ends electrically connect, specifically, in the embodiment of the present invention the first discharge circuit facilities, two kinds of i ≠ j and i=j can be divided into Situation, Fig. 2 are illustrated by taking i ≠ j as an example, or, the second connection end of the first discharge circuit 130 is defeated with the inverter Go out end electrical connection；
Wherein described m, i, j are positive integer.
It should be noted that the first end of the first electric capacity described in the embodiment of the present invention is the positive pole of corresponding first electric capacity, Such as the P points in Fig. 2, the negative pole of corresponding first electric capacity in the second end, such as the N points in Fig. 2, the first end of each switching tube refers to that this is opened The colelctor electrode of pipe is closed, the second end refers to the emitter stage of the switching tube.Certain above-mentioned first end and the second end can tables in turn Show, be not limited thereof herein, those skilled in the art, which both knows about, is so used for the purpose of that each component is explicitly described Between annexation.
Preferably, as shown in Fig. 2 the first discharge circuit 130 also includes being connected on first connection end and described second First switch S and the first impedance Z d between connection end.First switch S electrically connects with first connection end, the first impedance Z d Electrically connected with the second connection end；Or first switch S electrically connects with the second connection end, the first impedance Z d with it is described First connection end electrically connects.First switch S is preferably relay, naturally it is also possible to is any type of gate-controlled switch or common Switch, such as IGCT, switching tube etc., are not construed as limiting herein.First impedance Z d can be that various types of resistance etc. can disappear The device of consuming electric power.
The embodiment of the present invention additionally provides a kind of control method based on multi-electrical level inverter circuit, the control method bag Include：Control first switch pipe, the second switch pipe in m level switch unit of cascade, and the conducting of the first discharge circuit Or close so that the first electric capacity in m level switch unit of cascade forms discharge loop with the first discharge circuit and put Electricity.Specific control program is referred to follow-up embodiment.
A kind of multi-electrical level inverter circuit provided in an embodiment of the present invention and its control method, by setting the m to cascade First discharge circuit of the first electric capacity electric discharge in individual level switch unit, its first connection end and i-th of level switch unit In the first electric capacity first end electrical connection, second connection end and the second end of the first electric capacity in j-th of level switch unit are electrically connected Connect, or, the second connection end of first discharge circuit electrically connects with the output end of the inverter, the switching of reusable level Each switching tube in unit, by controlling the first discharge circuit and the action of corresponding switching tube to can be achieved to being used as the electricity that suspends The electric discharge of the first electric capacity held.And first discharge circuit has the advantages of cost is low, simple to operate, reliable.
Embodiment two
On the basis of above-described embodiment, the present embodiment show in particular when described first as a preferred embodiment Discharge circuit is connected to the discharge line figure between two neighboring level switch unit, specifically includes two kinds of situations.The first Situation is that the first connection end of the first discharge circuit electrically connects with the first end of the first electric capacity in i-th of level switch unit, the The second connection end of one discharge circuit electrically connects with the second end of the first electric capacity in i+1 level switch unit.Wherein i is just Integer, i+1 are less than or equal to m.
Fig. 3 is a kind of structural representation one for inverter circuit that the embodiment of the present invention two provides, and is represented for convenience, this Situations of the i equal to 1 is taken to be specifically described in embodiment, as shown in Figure 3.The first electricity in the 1st level switch unit When appearance C1 is discharged, the Q21 conductings of control second switch pipe, the first switch S being closed in the first discharge circuit 130, put Electrical circuit is：C1 P points, first switch S, the first impedance Z d, C2 N points, second switch pipe Q21, C1 N points；When to second When the first electric capacity C2 in individual level switch unit is discharged, the Q11 conductings of control first switch pipe, the first electric discharge is closed at First switch S in circuit 130, discharge loop are：First electric capacity C2 P points, first switch pipe Q11, the first electric capacity C1 P Point, first switch S, the first impedance Z d, the first electric capacity C2 N points；The first electric capacity Cm in m-th of level switch unit enters During row electric discharge, the first electric capacity Cm P points first electric capacity into the 1st level switch unit in m-th of level switch unit of control All first switch pipe Q11, Q12 ... Q1 (m-1) between C1 P points turn on, the first electric capacity in m-th of level switch unit All second switch pipe Q22, Q23 ... Q2s of the Cm N points into the 2nd level switch unit between the first electric capacity C2 N points (m-1) turn on, and first discharge circuit 130 turns on, and closes the first switch S in the first discharge circuit 130, the first electricity Hold Cm discharge loop be：First electric capacity Cm P points, by first switch pipe Q1 (m-1), Q1 (m-2) ... Q12, Q11, One electric capacity C1 P points, first switch S, the first impedance Z d, the first electric capacity C2 N points, second switch pipe Q22, Q23 ... Q2 (m- 1) the first electric capacity Cm N-terminal is reached.
Fig. 4 is a kind of structural representation two for inverter circuit that the embodiment of the present invention two provides, and wherein i is equal to m, and takes It is worth for 1.
When the first electric capacity C1 in first level switch unit discharges, the Q21 conductings of control second switch pipe The first switch S being closed in the first discharge circuit 130, discharge loop are：First electric capacity C1 P points, first switch S, the One impedance Z d, output end, second switch pipe Q21, the first electric capacity C1 N points.
Fig. 5 is a kind of structural representation two for inverter circuit that the embodiment of the present invention two provides, in order to clearer, figure I values are that 1, m values are 3 in 5.When the first electric capacity C1 in first level switch unit discharges, control second Switching tube Q21 conductings are closed at the first switch S in the first discharge circuit 130, and discharge loop is：First electric capacity C1 P points, First switch S, the first impedance Z d, the first electric capacity C2 N points, second switch pipe Q21, the first electric capacity C1 N points；When to second When the first electric capacity C2 in level switch unit is discharged, the Q11 conductings of control first switch pipe are closed at the first electric discharge electricity First switch S in road 130, discharge loop are：First electric capacity C2 P points, first switch pipe Q11, the first electric capacity C1 P points, First switch S, the first impedance Z d, the first electric capacity C2 N points；The first electric capacity C3 in the 3rd level switch unit is carried out During electric discharge, the first electric capacity C3 P points first electric capacity C1 into the 1st level switch unit in the 3rd level switch unit of control P points between all first switch pipe Q11, Q12 conducting, the first electric capacity C3 N points are to the 2nd in the 3rd level switch unit Second switch pipe Q22 conductings in individual level switch unit between the first electric capacity C2 N points, and the first discharge circuit 130 are led It is logical, the first switch S in the first discharge circuit 130 is closed, the first electric capacity C3 discharge loop is：First electric capacity C3 P points, warp Cross first switch pipe Q12, Q11, the first electric capacity C1 P points, first switch S, the first impedance Z d, the first electric capacity C2 N points, second Switching tube Q22 reaches the first electric capacity C3 N points.
Second of situation is the first connection end of the first discharge circuit 130 and the first electric capacity in i-th of level switch unit First end electrical connection, the second connection end of the first discharge circuit 130 and the of the first electric capacity in the i-th -1 level switch unit Two ends electrically connect.Wherein i is positive integer, and i-1 is more than or equal to 1.
In order to facilitate expression, situations of the i equal to 2 is taken to be specifically described in the present embodiment, as shown in fig. 6, when to first When the first electric capacity C1 in individual level switch unit is discharged, the Q11 conductings of control first switch pipe are closed at the first electric discharge First switch S in circuit 130, discharge loop be the first electric capacity C1 P points, first switch pipe Q11, the first electric capacity C2 P points, The first electric capacity C1 N points are reached by the first impedance Z d, first switch S；The first electricity in second level switch unit When appearance C2 is discharged, controlling switch pipe Q21 conductings are closed at the switch S in the first discharge circuit 130, the first electric capacity C2's Discharge loop is：First electric capacity C2 P points, the first impedance Z d, first switch S, the first electric capacity C1 N points, by second switch Pipe Q21, reach the first electric capacity C2 N points；When the first electric capacity Cm in m-th of level switch unit discharges, control The first electric capacity Cm P points are into the 2nd level switch unit between the first electric capacity C2 P points in m-th of level switch unit The conducting of all first switch pipe Q12, Q13 ... Q1 (m-1), the first electric capacity Cm N points are to the in m-th of level switch unit All second switch pipe Q21, Q22 ... Q2 (m-1) conducting of first electric capacity C1 N points, Yi Ji in 1 level switch unit One discharge circuit 130 turns on, and closes the first switch S in the first discharge circuit 130.First electric capacity Cm discharge loop is：The One electric capacity Cm P points, Q13, Q12 by first switch pipe Q1 (m-1) ..., the first electric capacity C2 P points, the first impedance Z d, the One switch S, the first electric capacity C1 N points, by the first electric capacity Cm of second switch pipe Q21, Q22, Q2 (m-1) arrival N points.
In order to clearer, Fig. 7 is given when i is equal to discharge line figures of 2, the m equal to 3.Switch when to first level When the first electric capacity C1 in unit is discharged, the Q11 conductings of control first switch pipe are closed in the first discharge circuit 130 First switch S, discharge loop are C1 P points, first switch pipe Q11, the first electric capacity C2 P points, by the first impedance Z d, first Switch the N points that S reaches the first electric capacity C1；When the first electric capacity C2 in second level switch unit discharges, control Second switch pipe Q21 conductings are closed at the first switch S in the first discharge circuit 130, and the first electric capacity C2 discharge loop is： First electric capacity C2 P points, the first impedance Z d, first switch S, the first electric capacity C1 N points, by second switch pipe Q21, reach the One electric capacity C2 N points；When the first electric capacity C3 in the 3rd level switch unit discharges, the 3rd level switching is controlled First switch pipe Q12 of the first electric capacity C3 P points into the 2nd level switch unit between the first electric capacity C2 P points is led in unit It is logical, in the 3rd level switch unit the first electric capacity C3 N points into the 1st level switch unit the first electric capacity C1 N points the Two switching tube Q21, Q22 are turned on, and the first discharge circuit 130 turns on, that is, closes the first switch in the first discharge circuit 130 S.First electric capacity C3 discharge loop is：First electric capacity C3 P points, by first switch pipe Q12, the first electric capacity C2 P points, One impedance Z d, first switch S, the first electric capacity C1 N points, the first electric capacity C3 N points are reached by second switch pipe Q21, Q22.
The technical scheme of the present embodiment, by setting what is discharged the first electric capacity in m level switch unit of cascade First discharge circuit, its first connection end electrically connect with the first end of the first electric capacity in i-th of level switch unit, the second connection End electrically connects with the second end of the first electric capacity in i+1 level switch unit, or, the second of first discharge circuit connects Connect end to electrically connect with the second end of the first electric capacity in the i-th -1 level switch unit, be multiplexed in inverter level switch unit Switching tube, by controlling the first discharge circuit and the corresponding switching tube action i.e. achievable electric discharge to the flying capacitor.This First discharge circuit cost is low, simple to operate, reliable.
Embodiment three
On the basis of above-described embodiment, the present embodiment show in particular when the first electric discharge as a preferred embodiment Circuit 130 is connected to the discharge line between non-conterminous two-stage level switch unit.
If the first connection end of the first discharge circuit 130 and the first end electricity of the first electric capacity in i-th of level switch unit Connection, the second connection end of the first discharge circuit 130 electrically connect with the second end of the first electric capacity in j-th of level switch unit, When then discharging the first electric capacity in i-th of level switch unit, the second end of the first electric capacity in i-th of level switch unit is controlled Switching tube conducting into j-th of level switch unit between the second end of the first electric capacity, and the first discharge circuit 130 Conducting；When then discharging the first electric capacity in j-th of level switch unit, the first electric capacity in j-th of level switch unit is controlled Switching tube conducting of the first end into i-th of level switch unit between the first end of the first electric capacity, and the first electric discharge Circuit 130 turns on, and forms it into discharge loop；Then the first electric capacity in n-th of level switch unit in addition to i-th, j is discharged When, control n-th of level switch unit in the first electric capacity first end into i-th of level switch unit the first electric capacity Switching tube conducting between first end, the second end of the first electric capacity is to j-th of level switch unit in n-th of level switch unit In the first electric capacity the second end switching tube conducting, and the first discharge circuit 130 turns on, and forms it into discharge loop, wherein, N is the positive integer less than or equal to m.
Specifically, taking i to be equal to 3, j in order to clearly show that, in the present embodiment is equal to situation progress of the 1 and m equal to 3 specifically Description, as shown in Figure 8.First connection end of the first discharge circuit 130 and first of the first electric capacity C3 in the 3rd level switch unit Hold P electrical connections, the second connection end of the first discharge circuit 130 and the second end N electricity of the first electric capacity C1 in the 1st level switch unit Connection.
When the first electric capacity C1 in one-level level switch unit discharges, control first switch pipe Q11, Q12 are led Lead to, the first switch S being closed in the first discharge circuit 130, the first electric capacity C1 discharge loops are：First electric capacity C1 P points, First switch pipe Q11, Q12, the first electric capacity C3 P points, by first switch S, the first impedance Z d, the first electric capacity C1 of arrival N Point；When the first electric capacity C2 in second level switch unit discharges, control first switch pipe Q12, Q21 conducting is same When close first switch S in the first discharge circuit 130, the first electric capacity C2 discharge loop is：First electric capacity C2 P points, the One switching tube Q12, the first electric capacity C3 P points, by first switch S, the first impedance Z d, the is reached by second switch pipe Q21 One electric capacity C2 N points；When the first electric capacity C3 in the 3rd level switch unit discharges, second switch pipe is controlled Q21, Q22 are turned on, and the first discharge circuit 130 turns on, and close the first switch S in the first discharge circuit 130, the first electric capacity C3 discharge loops are：First electric capacity C3 P points, first switch S, the first impedance Z d, by second switch pipe Q21, Q22 reaches the One electric capacity C3 N points.
Or first discharge circuit 130 the first connection end and the 1st level switch unit in the first electric capacity C1 first end P is electrically connected, the second connection end of the first discharge circuit 130 and the second end N electricity of the first electric capacity C3 in the 3rd level switch unit Connection.As shown in Figure 9.
When the first electric capacity C1 in first level switch unit discharges, second switch pipe Q21, Q22 are controlled Conducting, the first switch S being closed in the first discharge circuit 130, the first electric capacity C1 discharge loops are：First electric capacity C1 P Point, by first switch S, the first impedance Z d, second switch pipe Q22, Q21, the N points for reaching the first electric capacity C1；When to second When the first electric capacity C2 in level switch unit is discharged, first switch pipe Q11, second switch pipe Q22 is controlled to turn on, simultaneously The first switch S in the first discharge circuit 130 is closed, the first electric capacity C2 discharge loop is：First electric capacity C2 P points, first Switching tube Q11, the first electric capacity C1 P points, by first switch S, the first impedance Z d, first is reached by second switch pipe Q22 Electric capacity C2 N points；When the first electric capacity C3 in the 3rd level switch unit discharges, control first switch pipe Q12, Q11 is turned on, and the first discharge circuit 130 turns on, and closes the first switch S in the first discharge circuit 130, and the first electric capacity C3 is put Electrical circuit is：First electric capacity C3 P points, first switch pipe Q12, Q11, the first electric capacity C1 P points, first switch S, the first impedance Zd, reach the first electric capacity C3 N points.
The technical scheme of the present embodiment, by setting what is discharged the first electric capacity in m level switch unit of cascade First discharge circuit, first discharge circuit are connected between non-conterminous two level switch units, are multiplexed the electricity of inverter Switching tube in flat switch unit, by controlling the first discharge circuit and the action of corresponding switching tube to can be achieved to the suspension The electric discharge of electric capacity.This first discharge circuit cost is low, simple to operate, reliable.
Example IV
With above-mentioned each embodiment and its accompanying drawing, illustrated in case of i ≠ j, in the embodiment of the present invention, It can also be that the first connection end of the first discharge circuit electrically connects with the first end of the first electric capacity in i-th of level switch unit, The second connection end of first discharge circuit electrically connects with the second end of the first electric capacity in j-th of level switch unit, wherein i=j. Figure 10 is a kind of discharge line schematic diagram that the embodiment of the present invention four provides, as shown in figure 4, the first of the first discharge circuit 130 Connection end electrically connects with the first end of the first electric capacity in the 1st level switch unit, the second connection end of the first discharge circuit 130 Electrically connected with the second end of the first electric capacity in the 1st level switch unit.The first electricity in first level switch unit When appearance C1 is discharged, control first switch S is turned on, and the first electric capacity C1 discharge loops are：First electric capacity C1 P points, by One switch S, the first impedance Z d, reach the first electric capacity C1 N points；The first electric capacity C2 in second level switch unit enters During row electric discharge, first switch pipe Q11 is controlled, second switch pipe Q21 conductings, is closed at first switch S, the first electric capacity C2's puts Electrical circuit is：First electric capacity C2 P points, first switch pipe Q11, the first electric capacity C1 P points, by first switch S, the first impedance Zd, the first electric capacity C2 N points are reached by second switch pipe Q21；The first electric capacity C3 in the 3rd level switch unit enters During row electric discharge, control first switch pipe Q12, Q11 are turned on, in the first discharge circuit 130 of second switch pipe Q21, Q22 and closure First switch S, the first electric capacity C3 discharge loops are：First electric capacity C3 P points, first switch pipe Q12, Q11, the first electric capacity C1 P points, first switch S, the first impedance Z d, the first electric capacity C1 N points, second switch pipe Q21, Q22, reach the first electric capacity C3 N points.
The technical scheme of the present embodiment, by setting what is discharged the first electric capacity in m level switch unit of cascade First discharge circuit, first discharge circuit are connected between first level switch unit, and the level for being multiplexed inverter is cut The switching tube changed in unit, by controlling the first discharge circuit and the action of corresponding switching tube to can be achieved to the flying capacitor Electric discharge.This first discharge circuit cost is low, simple to operate, reliable.
Embodiment five
On the basis of above-described embodiment, the present embodiment show in particular when the first electric discharge as a preferred embodiment One connection end of circuit 130 is connected to the discharge line of the output end of the inverter.
If the first connection end of the first discharge circuit 130 and the first end electricity of the first electric capacity in i-th of level switch unit Connection, when the second connection end of the first discharge circuit 130 electrically connects with the output end of the inverter；Then to described i-th electricity When the first electric capacity discharges in flat switch unit, the second end of the first electric capacity in i-th of level switch unit is controlled to the inversion All switching tubes conducting between the output end of device, and the first discharge circuit 130 turn on；Then to n-th in addition to i-th When the first electric capacity discharges in level switch unit, the first end of the first electric capacity in n-th of level switch unit is controlled to described i-th All switching tubes in individual level switch unit between the first end of the first electric capacity turn on, first in n-th of level switch unit Second end of electric capacity turns on to all switching tubes conducting between the output end of the inverter and the first discharge circuit 130.
Specifically, taking i to be equal to 2, m in order to clearly show that, in the present embodiment is equal to 3, as shown in figure 11, the first discharge circuit 130 the first connection end electrically connects with the first electric capacity C2 of second level switch unit first end P, second connection end and institute State the output end electrical connection of inverter.
When the first connection end of the first discharge circuit 130 is not connected with the first electric capacity of first level switch unit, The multi-electrical level inverter circuit also includes at least one second discharge circuit 140, the first connection end of the second discharge circuit 140 Electrically connected with the first end of the first electric capacity in k-th of level switch unit, the second connection end and kth of the second discharge circuit 140 The second end electrical connection of the first electric capacity, k are the positive integer less than i, and less than j in individual level switch unit.K takes in the present embodiment 1, i.e. the first connection end of the second discharge circuit 140 electrically connects with the first end of the first electric capacity in the 1st level switch unit, the The second connection end of two discharge circuits 140 electrically connects with the second end of the first electric capacity in the 1st level switch unit.
Second discharge circuit 140 includes the second switch being connected between first connection end and the second connection end S and the second impedance Z d.
Because the electricity of the first electric capacity in the other level switch units of the first capacity ratio in first level switch unit Pressure is high, so when the first connection end of the first discharge circuit 130 is not connected with the first electric capacity of first level switch unit, Need to increase by the second discharge circuit 140, pass through the second discharge circuit 140 first before using the electric discharge of the first discharge circuit 130 To in first level switch unit the first electric capacity discharge, when the first electric capacity in first level switch unit voltage with Discharged again by the first discharge circuit 130 when the voltage of the first electric capacity in other level switch units is equal.
When the first electric capacity C1 in first level switch unit discharges, control first switch pipe Q11, second Switching tube Q23, Q22, Q21 are turned on, the first switch S being closed in the first discharge circuit 130, the first electric capacity C1 discharge loops For：First electric capacity C1 P points, first switch pipe Q11, the first electric capacity C2 P points, by first switch S, the first impedance Z d, Two switching tube Q23, Q22, Q21, reach the first electric capacity C1 N points；The first electric capacity C2 in second level switch unit When being discharged, control second switch pipe Q23, Q22 conducting, the first switch S being closed in the first discharge circuit 130, the One electric capacity C2 discharge loop is：First electric capacity C2 P points, by first switch S, the first impedance Z d, by second switch pipe Q23, Q22, reach the first electric capacity C2 N points；When the first electric capacity C3 in the 3rd level switch unit discharges, control First switch pipe Q12 processed, second switch pipe Q23 conducting, and the first discharge circuit 130 turn on, and close the first discharge circuit 130 In first switch S, the first electric capacity C3 discharge loops are：First electric capacity C3 P points, first switch pipe Q12, the first electric capacity C2's P points, first switch S, the first impedance Z d, second switch pipe Q23 reach the first electric capacity C3 N points.
Or first discharge circuit 130 the first connection end and the first electric capacity C2 of second level switch unit the Two end N are electrically connected, and second connection end electrically connects with the output end of the inverter.As shown in figure 12.
When the first electric capacity C1 in first level switch unit discharges, control first switch pipe Q11, Q12, Q13, second switch pipe Q21 are turned on, the first switch S being closed in the first discharge circuit 130, the first electric capacity C1 discharge loops For：First electric capacity C1 P points, first switch pipe Q11, Q12, Q13, the first impedance Z d, by first switch S, second switch pipe Q21, reach the first electric capacity C1 N points；When the first electric capacity C2 in second level switch unit discharges, control the One switching tube Q12, Q13 conducting, the first switch S being closed in the first discharge circuit 130, the first electric capacity C2 discharge loop For：First electric capacity C2 P points, reach the first electric capacity C2's by first switch pipe Q12, Q13, the first impedance Z d, first switch S N points；When the first electric capacity C3 in the 3rd level switch unit discharges, control first switch pipe Q13, second switch Pipe Q22 is turned on, and the first discharge circuit 130 turns on, and closes first switch S, the first electric capacity C3 in the first discharge circuit 130 Discharge loop is：First electric capacity C3 P points, first switch pipe Q13, the first impedance Z d, first switch S, second switch pipe Q22, Reach the first electric capacity C3 N points.
The technical scheme of the present embodiment, by setting what is discharged the first electric capacity in m level switch unit of cascade First discharge circuit, one connection end electrically connect with the first end of the first electric capacity in i-th of level switch unit, another company The output end that end is connected to the inverter is connect, the switching tube being multiplexed in the level switch unit of inverter, passes through control first The electric discharge to the flying capacitor can be achieved in discharge circuit and the action of corresponding switching tube.This first discharge circuit cost is low, It is simple to operate, reliable.Compared with the connected mode of the first discharge circuit in embodiment two and embodiment three, in the present embodiment Need to control more switching tubes to act, by contrast, embodiment two and implementation when connected mode discharges to corresponding capacitance Connected mode described in example three is more preferably.
Embodiment six
On the basis of above-described embodiment, the embodiment of the present invention six provides the embodiment party of several primary electric capacity inversion units Formula, can be specifically Figure 13, Figure 14, Figure 15, Figure 16, and it is only four kinds of preferable primary electricals that the embodiment of the present invention six provides Hold the circuit diagram of inversion unit 110, primary electric capacity inversion unit 110, which has, more kinds of realizes structure.
Shown in Figure 2, the primary electric capacity inversion unit 110 includes：Second electric capacity C4, the 3rd electric capacity C5, the 4th switch Pipe Q4, the 5th switching tube Q5, the 6th switching tube Q6, the 7th switching tube Q7, the 8th switching tube Q8 and the 9th switching tube Q9.
Second electric capacity C4 first end and the positive pole of cell panel, and the 4th switching tube Q4 first end connection, the second electricity Hold C4 the second end and the first end of the 3rd electric capacity C5, and the second end of the 6th switching tube Q6, the 7th switching tube Q7 first end electrical connection；3rd electric capacity C5 the second end and the negative pole of cell panel, and the 9th switching tube Q9 the second end electricity Connection；In 4th switching tube Q4 the second end and the 5th switching tube Q5 the second end, and first level switch unit The first end electrical connection of first electric capacity；5th switching tube Q5 first end electrically connects with the 6th switching tube Q6 first end；7th Switching tube Q7 the second end and the 8th switching tube Q8 the second end electrical connection, the 8th switching tube Q8 first end and the 9th switching tube The second end electrical connection of first electric capacity in Q9 first end, and first level switch unit.
Or it is shown in Figure 14, the primary electric capacity inversion unit 110 includes：Second electric capacity C4, the 3rd electric capacity C5, Four switching tube Q4, the 5th switching tube Q5, the 6th switching tube Q6, the 7th switching tube Q7, the 8th switching tube Q8 and the 9th switching tube Q9. Second electric capacity C4 first end and the positive pole of the cell panel, and the 4th switching tube Q4 first end electrical connection, the second electric capacity C4 the second end and the 3rd electric capacity C5 first end, and the 6th switching tube Q6 the second end, the 7th switching tube Q7 first end Electrical connection；3rd electric capacity C5 the second end and the negative pole of the cell panel, and the 9th switching tube Q9 the second end electrical connection；The Four switching tube Q4 the second end and the 5th switching tube Q5 first end, and the 6th switching tube Q6 first end electrical connection；5th Switching tube Q5 the second end electrically connects with the first end of the first electric capacity in first level switch unit；The of 7th switching tube Q7 Two ends and the 8th switching tube Q8 the second end, and the 9th switching tube Q9 first end electrical connection；The first of 8th switching tube Q8 End electrically connects with the second end of the first electric capacity in first level switch unit.
In addition, participating in shown in Figure 15, primary electric capacity inversion unit 110 includes：Second electric capacity C4, the 3rd electric capacity C5, the 4th Electric capacity C45, the 4th switching tube Q4, the 5th switching tube Q5, the 6th switching tube Q6, the 7th switching tube Q7, the 8th switching tube Q8 and Nine switching tube Q9；.Wherein, the second electric capacity C4 first end and the positive pole of the cell panel, and the first of the 4th switching tube Q4 End electrical connection, the second electric capacity C4 the second end and the 4th electric capacity C45 first end, and the 6th switching tube Q6 the second end are electrically connected Connect；4th electric capacity C45 the second end and the 7th switching tube Q7 first end, and the 3rd electric capacity C5 first end electrical connection；The Three electric capacity C5 the second end and the negative pole of the cell panel, and the 9th switching tube Q9 the second end electrical connection；4th switching tube Q4 the second end and the first end of the first electric capacity in the 5th switching tube Q5 the second end, and first level switch unit Electrical connection；5th switching tube Q5 first end electrically connects with the 6th switching tube Q6 first end；7th switching tube Q7 the second end Electrically connected with the 8th switching tube Q8 the second end, the 8th switching tube Q8 first end and the 9th switching tube Q9 first end, and The second end electrical connection of first electric capacity in first level switch unit；
Or participate in shown in Figure 16, primary electric capacity inversion unit 110 includes：Second electric capacity C4, the 3rd electric capacity C5, the 4th Electric capacity C45, the 4th switching tube Q4, the 5th switching tube Q5, the 6th switching tube Q6, the 7th switching tube Q7, the 8th switching tube Q8 and Nine switching tube Q9.Wherein, the second electric capacity C4 first end and the positive pole of the cell panel, and the 4th switching tube Q4 first end Connection, the second electric capacity C4 the second end and the 4th electric capacity C45 first end, and the 6th switching tube Q6 the second end electrical connection； 4th electric capacity C45 the second end and the 7th switching tube Q7 first end, and the 3rd electric capacity C5 first end electrical connection；3rd electricity Hold C5 the second end and the negative pole of the cell panel, and the 9th switching tube Q9 the second end electrical connection；4th switching tube Q4's Second end and the 5th switching tube Q5 first end, and the 6th switching tube Q6 first end electrical connection；The of 5th switching tube Q5 Two ends electrically connect with the first end of the first electric capacity in first level switch unit；7th switching tube Q7 the second end and Eight switching tube Q8 the second end, and the 9th switching tube Q9 first end electrical connection；8th switching tube Q8 first end with it is described The second end electrical connection of first electric capacity in first level switch unit.
It should be noted that the first end of the electric capacity refers to the positive pole of electric capacity, the second end refers to the negative pole of electric capacity, works as institute When stating switching tube includes mos field effect transistor or insulated gate bipolar transistor, the of the switching tube One end refers to the colelctor electrode of switching tube, and the second end refers to the emitter stage of switching tube.
In the above-mentioned each embodiment of the present invention, first switch pipe therein, the second switch pipe, the 4th switching tube, the Five switching tubes, the 6th switching tube, the 7th switching tube, the 8th switching tube and the 9th switching tube may each comprise metal oxide and partly lead Body field-effect transistor or insulated gate bipolar transistor, and mos field effect transistor and insulated gate are double Backward dioded is provided with bipolar transistor body.Now, can be that each switching tube is led when discharging each first electric capacity It is logical, utilize the backward dioded shape set in mos field effect transistor and insulated gate bipolar transistor body Into discharge loop.
In addition, above-mentioned first switch pipe, the second switch pipe, the 4th switching tube, the 5th switching tube, the 6th switch Pipe, the 7th switching tube, the 8th switching tube and the 9th switching tube include mos field effect transistor or insulated gate Bipolar transistor, and with mos field effect transistor or insulated gate bipolar transistor reverse parallel connection Diode.Now, can be the conducting of each switching tube when discharging each first electric capacity, by with each metal oxide half The diode of conductor field-effect transistor or insulated gate bipolar transistor reverse parallel connection forms discharge loop, insulated gate therein Bipolar transistor can be inverse-impedance type insulated gate bipolar transistor, and it is in vivo without backward dioded.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes, Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.

Claims (12)

  1. A kind of 1. multi-electrical level inverter circuit, it is characterised in that the m level switching including primary electric capacity inversion unit, cascade Unit and the first discharge circuit；
    The input of the primary electric capacity inversion unit is connected with dc source；
    The level switch unit includes the first electric capacity, first switch pipe and second switch pipe, wherein the first end of the first electric capacity Being electrically connected with the first end of first switch pipe, the second end of the first electric capacity electrically connects with the second end of second switch pipe, wherein, the In 1 level switch unit, the first output end of the first end of its first electric capacity also with the primary electric capacity inversion unit is electrically connected Connect, the second end of the first electric capacity also electrically connects with the above-mentioned primary output end of electric capacity inversion unit second, m-th of level switch unit In, the second end of first switch pipe and the first end electrical connection of second switch pipe, and it is connected to the output end of inverter, m >=1； And as m >=2, then in m-th of level switch unit, the first end of the first electric capacity and the first of the m-1 level switch unit The second end electrical connection of switching tube, the second end of the first electric capacity and the first of the second switch pipe of the m-1 level switch unit End electrical connection；
    First discharge circuit, for the first electric capacity electric discharge in the m level switch unit to cascade, including the first connection End and second connection end, the first connection end of first discharge circuit and the of the first electric capacity in i-th level switch unit One end electrically connects, the second connection end of first discharge circuit and the second end of the first electric capacity in j-th of level switch unit Electrical connection, or, the second connection end of first discharge circuit electrically connects with the output end of the inverter；
    Wherein, described m, i, j are positive integer；
    The primary electric capacity inversion unit includes：Second electric capacity, the 3rd electric capacity, the 4th switching tube, the 5th switching tube, the 6th switch Pipe, the 7th switching tube, the 8th switching tube and the 9th switching tube；
    Wherein, the first end of second electric capacity and the positive pole of the dc source, and the first end of the 4th switching tube Connection, the second end of second electric capacity and the first end of the 3rd electric capacity, and the second end of the 6th switching tube, institute State the first end electrical connection of the 7th switching tube；Second end of the 3rd electric capacity and the negative pole of the dc source, and it is described The second end electrical connection of 9th switching tube；Second end of the 4th switching tube and the second end of the 5th switching tube, and The first end electrical connection of first electric capacity in the 1st level switch unit；
    The first end of 5th switching tube electrically connects with the first end of the 6th switching tube；The second of 7th switching tube End and the second end of the 8th switching tube electrically connect, the first end of the 8th switching tube and the first of the 9th switching tube End, and the second end of the first electric capacity electrically connects in the 1st level switch unit；Or
    The first end of second electric capacity and the positive pole of the dc source, and the first end of the 4th switching tube are electrically connected Connect, the first end of the second end of second electric capacity and the 3rd electric capacity, and it is the second end of the 6th switching tube, described The first end electrical connection of 7th switching tube；Second end of the 3rd electric capacity and the negative pole of the dc source, and described the The second end electrical connection of nine switching tubes；Second end of the 4th switching tube and the first end of the 5th switching tube, Yi Jisuo State the first end electrical connection of the 6th switching tube；Second end of the 5th switching tube and the first electricity in the 1st level switch unit The first end electrical connection of appearance；Second end of the 7th switching tube and the second end of the 8th switching tube, and the described 9th The first end electrical connection of switching tube；The first end of 8th switching tube and the first electric capacity in the 1st level switch unit The second end electrical connection.
  2. 2. inverter circuit according to claim 1, it is characterised in that the first connection end of first discharge circuit with In 1st level switch unit the first electric capacity first end electrical connection, the second connection end of first discharge circuit with the 1st The second end electrical connection of first electric capacity in level switch unit.
  3. 3. inverter circuit according to claim 1, it is characterised in that first discharge circuit also includes being connected on institute State the first switch between the first connection end and the second connection end and the first impedance.
  4. 4. inverter circuit according to claim 3, it is characterised in that the first switch and first connection end electricity Connection, first impedance electrically connect with the second connection end；Or the first switch is electrically connected with the second connection end Connect, first impedance electrically connects with first connection end.
  5. 5. inverter circuit according to claim 3, it is characterised in that the first switch is gate-controlled switch tube device.
  6. 6. inverter circuit according to claim 1, it is characterised in that the first connection end of first discharge circuit with The first end electrical connection of first electric capacity, the second connection end and i+1 of first discharge circuit in i-th of level switch unit The second end electrical connection of first electric capacity in individual level switch unit；Or
    First connection end of first discharge circuit electrically connects with the first end of the first electric capacity in i-th of level switch unit, The second connection end of first discharge circuit electrically connects with the second end of the first electric capacity in the i-th -1 level switch unit.
  7. 7. inverter circuit according to claim 1, it is characterised in that also including at least one second discharge circuit, institute The first connection end for stating the second discharge circuit electrically connects with the first end of the first electric capacity in k-th of level switch unit, and described The second connection end of two discharge circuits electrically connects with the second end of the first electric capacity in k-th of level switch unit, k be less than i, and Positive integer less than j；
    Second discharge circuit include being connected on second switch between first connection end and the second connection end and Second impedance.
  8. 8. inverter circuit according to claim 7, it is characterised in that the first connection end of second discharge circuit with In 1st level switch unit the first electric capacity first end electrical connection, the second connection end of second discharge circuit with the 1st The second end electrical connection of first electric capacity in level switch unit.
  9. 9. inverter circuit according to claim 1, it is characterised in that the primary electric capacity inversion unit includes：Second Electric capacity, the 3rd electric capacity, the 4th electric capacity, the 4th switching tube, the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th switching tube With the 9th switching tube；
    Wherein, the first end of second electric capacity and the positive pole of the dc source, and the first end of the 4th switching tube Electrical connection, the second end of second electric capacity and the first end of the 4th electric capacity, and the second end of the 6th switching tube Electrical connection；Second end of the 4th electric capacity and the first end of the 7th switching tube, and the first end of the 3rd electric capacity Electrical connection；Second end of the 3rd electric capacity and the negative pole of the dc source, and the second end electricity of the 9th switching tube Connection；Second end of the 4th switching tube and the second end of the 5th switching tube, and the 1st level switch unit In the first electric capacity first end electrical connection；
    The first end of 5th switching tube electrically connects with the first end of the 6th switching tube；The second of 7th switching tube End and the second end of the 8th switching tube electrically connect, the first end of the 8th switching tube and the first of the 9th switching tube End, and the second end of the first electric capacity electrically connects in the 1st level switch unit；Or
    The first end of second electric capacity and the positive pole of the dc source, and the first end connection of the 4th switching tube, Second end of second electric capacity and the first end of the 4th electric capacity, and the second end electrical connection of the 6th switching tube； Second end of the 4th electric capacity and the first end of the 7th switching tube, and the first end electrical connection of the 3rd electric capacity； Second end of the 3rd electric capacity and the negative pole of the dc source, and the second end electrical connection of the 9th switching tube；Institute The second end of the 4th switching tube and the first end of the 5th switching tube are stated, and the first end of the 6th switching tube is electrically connected Connect；Second end of the 5th switching tube electrically connects with the first end of the first electric capacity in the 1st level switch unit；It is described Second end of the 7th switching tube and the second end of the 8th switching tube, and the first end electrical connection of the 9th switching tube； The first end of 8th switching tube electrically connects with the second end of the first electric capacity in the 1st level switch unit.
  10. A kind of 10. control method based on any described multi-electrical level inverter circuit of claim 1~9, it is characterised in that bag Include：
    Control first switch pipe, the second switch pipe in m level switch unit of cascade, and the conducting of the first discharge circuit Or close so that the first electric capacity in m level switch unit of cascade forms discharge loop with first discharge circuit and entered Row electric discharge.
  11. 11. control method according to claim 10, it is characterised in that first discharge circuit also includes being connected to institute The first switch between the first connection end and the second connection end and the first impedance are stated, if the first of first discharge circuit Connection end electrically connects with the first end of the first electric capacity in i-th of level switch unit, the second connection of first discharge circuit End electrically connects with the second end of the first electric capacity in j-th of level switch unit, then to the first electric capacity in i-th of level switch unit During electric discharge, the second end of the first electric capacity first electricity into j-th of level switch unit in i-th of level switch unit of control Switching tube conducting between the second end held, and first switch conducting, form it into discharge loop；Then to j-th of electricity When the first electric capacity discharges in flat switch unit, the first end of the first electric capacity in j-th of level switch unit is controlled to described i-th Switching tube conducting in level switch unit between the first end of the first electric capacity, and first switch conducting, are formed it into Discharge loop；When then discharging the first electric capacity in n-th of level switch unit in addition to i-th, j, n-th of level switching is controlled Switching tube of the first end of the first electric capacity into i-th of level switch unit between the first end of the first electric capacity is led in unit It is logical, the second end of the first electric capacity second end of the first electric capacity into j-th of level switch unit in n-th of level switch unit Switching tube turns on, and first switch conducting, forms it into discharge loop, and wherein n is just whole less than or equal to m Number.
  12. 12. control method according to claim 10, it is characterised in that first discharge circuit also includes being connected to institute The first switch between the first connection end and the second connection end and the first impedance are stated, if the first of first discharge circuit Connection end electrically connects with the first end of the first electric capacity in i-th of level switch unit, the second connection of first discharge circuit When end electrically connects with the output end of the inverter；When then discharging the first electric capacity in i-th of level switch unit, control The second end of the first electric capacity turns on to the switching tube between the output end of the inverter in i-th of level switch unit, and The first switch conducting, forms it into discharge loop；Then to the first electricity in n-th of level switch unit in addition to i-th During discharge capacitor, the first end of the first electric capacity in n-th of level switch unit is controlled into i-th of level switch unit first Switching tube conducting between the first end of electric capacity, the second end of the first electric capacity is to the inverter in n-th of level switch unit Output end between all switching tubes conducting and the first switch conducting, form it into discharge loop.
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