CN201430543Y - A Universal Switched Capacitor Diode Clamp Combination Multilevel Circuit - Google Patents

Abstract

The utility model discloses a general switched capacitor diode clamp combined multilevel circuit, which realizes multilevel output through the circuit combination of switched capacitor circuit and diode clamp topology. This topology can realize n-level voltage output, n≥4. Each bridge arm includes 2n-5 capacitors, of which n-3 are DC bus capacitors, and n-2 are suspension capacitors; 4×(n-2) switch tubes, of which 2×(n-2) are As for the main switch tube, 2×(n-2) clamp switch tubes; (n-2)×(n-3) clamp diodes. The advantages of the utility model are: 1. The automatic balance of the bus capacitor voltage can be realized by using the switched capacitor circuit, which can solve the problem that the capacitor voltage balance is difficult to realize in the case of high level numbers in the traditional diode clamp topology; 2. Low input voltage, using The switched capacitor topology circuit realizes high voltage output (the peak-to-peak output voltage is greater than the input voltage amplitude); 3. There are fewer switching devices.

Description

A Universal Switched Capacitor Diode Clamp Combination Multilevel Circuit

technical field

The utility model is a multi-level inverter topology used for mutual conversion between direct current and alternating current, specifically a multi-level inverter topology combined with a general switched capacitor circuit and a diode clamping circuit.

Background technique

Traditional multilevel inverters are mainly divided into three basic topologies: diode-clamped, flying-capacitor, and cascaded. They all have certain problems in practical application. Among them, the main problem of the diode-clamped topology is the unbalanced voltage of the DC bus voltage dividing capacitor, especially in the case of a high number of levels. This problem has become the main factor limiting the promotion of multi-level in practical applications. In recent years, many new topology improvements and control theories have been proposed and studied to solve the problem of unbalanced voltage of DC bus voltage dividing capacitors. However, these new improved methods either add more complex hardware circuits, or use more complex control algorithms, or are applicable at three levels, but are no longer applicable at five levels and higher. It is said that the problem of unbalanced voltage of the DC bus voltage dividing capacitor has not been properly solved.

Contents of the invention

The purpose of the utility model is to provide a general-purpose switched capacitor diode clamp combination multi-level circuit with a small number of components, automatic balance of DC bus capacitor voltage, and boost output.

The general-purpose switched capacitor diode clamp combination multi-level circuit of the utility model is provided with an n-level voltage output, n is a positive integer greater than or equal to 4, and each bridge arm includes:

1) 2n-5 capacitors, of which n-3 are DC bus capacitors and n-2 are suspension capacitors;

2) 4×(n-2) switch tubes, each switch tube is an active switch tube with an anti-parallel diode, of which 2×(n-2) are the main switch tubes, and 2×(n-2) One is a clamp switch tube;

3) (n-2)×(n-3) clamping diodes;

n-3 DC bus capacitors are connected in series to form a DC bus capacitor link. The connection method is that the negative pole of the previous capacitor is connected with the positive pole of the latter capacitor, and the connection constitutes a connection point. The positive pole of the first capacitor and the last The negative pole of a capacitor is used as the initial connection point and the terminal connection point respectively. The DC bus capacitor link has a total of n-2 connection points, and the n-2 connection points are numbered in sequence according to the connection sequence. The join point is n-2;

2×(n-2) clamp switch tubes are connected in series to form a clamp switch tube link. Constitute a connection point, the collector of the first clamping switch tube and the emitter of the last clamping switch tube are used as the starting connection point and the terminal connection point respectively, and the clamping switch tube link has a total of 2n-3 connection points , 2n-3 contacts are numbered according to the connection sequence, the initial connection point is 1, and the terminal connection point is 2n-3;

n-2 floating capacitors are connected in series to form a floating capacitor link. The connection method is that the negative pole of the previous capacitor is connected with the positive pole of the latter capacitor, and the connection constitutes a connection point. The positive pole of the first floating capacitor and the last The negative pole of the floating capacitor is used as the initial connection point and the terminal connection point respectively. The floating capacitor link has a total of n-1 connection points, and the n-1 connection points are numbered in sequence according to the connection sequence. Points are n-1;

The even-numbered connection points in the clamp switch tube link and the connection points in the DC bus capacitor link are connected in ascending order of number, and the odd-numbered connection points in the clamp switch tube link are connected to the connection points in the suspension capacitor link The points are connected in ascending order of numbers to form the switched capacitor topological part of the switched capacitor diode clamp combination multilevel circuit;

2×(n-2) main switching tubes are serially connected in series to form a main switching tube link. The connection method is that the emitter of the front main switching tube is connected with the collector of the following main switching tube, and the connection constitutes a connection point , the collector of the first main switching tube and the emitter of the last main switching tube are used as the initial connection point and the terminal connection point respectively, the main switching tube link has 2n-3 connection points in total, and 2n-3 connection points Numbered in order of connection, the initial connection point is 1, and the terminal connection point is 2n-3;

(n-2)×(n-3) clamping diodes form n-3 clamping diode chains, i is set to be a positive integer less than or equal to n-3, and the i-th clamping diode chain consists of 2i clamping diodes Diodes are connected in series in sequence. The connection method is that the anode of the previous clamping diode is connected with the cathode of the next clamping diode, and the connection constitutes a connection point. The cathode of the first clamping diode on each link and The anode of the last clamping diode is used as the initial connection point and the terminal connection point respectively. There are 2i+1 connection points on the i-th link, and the 2i+1 connection points are numbered in sequence according to the connection sequence, and the initial connection point is 1 , the terminal connection point is 2i+1; the first connection point in the i-th clamping diode link is connected to the n-1-i-th connection point in the main switch tube link, and the 2i+1-th connection point is connected to The n-1+i connection point in the main switch tube link is connected, and the odd-numbered connection points among the remaining connection points on the i-th clamping diode link are connected to the i-1 clamping diode link The connection points with even numbers are connected in ascending order; the first connection point in the suspension capacitor link is connected to the first connection point in the main switch tube link, and the last connection point in the suspension capacitor link is connected to the main switch tube chain. The last connection point in the circuit is connected, and the remaining connection points in the suspension capacitor link are connected with the even-numbered connection points in the n-3 clamping diode link in ascending order of numbers to form a multi-level switching capacitor diode clamping combination The diode clamp topology part of the circuit; the n-1th connection point in the main switching tube chain is used as the output connection point.

倍的升压输出，即输出电压的峰峰值为输入电压幅值的倍。In the general-purpose switched capacitor diode clamp combination multi-level circuit of the utility model, the direct current input voltage can have multiple access modes. The DC input voltage can be connected to both ends of any j continuous series capacitors in the DC bus capacitor link or floating capacitor link, where n-2≥j≥1, j is a positive integer, to achieve

times the boost output, that is, the peak-to-peak output voltage is equal to the input voltage amplitude times.

In single-phase operation, considering the symmetry of the positive and negative levels of the circuit and the loss on the device, the two input ports of the DC input voltage are generally symmetrical about the output connection point; in three-phase operation, considering the three-phase Between the symmetrical type and the loss of the device, the two input ports of the DC input voltage are generally only connected to the DC bus capacitor link, and are symmetrical about the output connection point.

The general-purpose switched capacitor diode clamp combination multi-level circuit of the utility model realizes multi-level output through the circuit combination of switch capacitor topology and diode clamp topology. Its advantages are: 1. Using the switched capacitor topology circuit to realize the automatic balance of the bus capacitor voltage can solve the problem that the capacitor voltage balance is difficult to achieve in the case of high level numbers in the traditional diode clamp topology; 2. Low input voltage, using the switched capacitor The topology circuit realizes high voltage output (the peak-to-peak value of the output voltage is greater than the amplitude of the input voltage). This boost function can reduce the transformation ratio of the input transformer or even save the input transformer; 3. There are fewer switching devices.

Description of drawings

Shown in Fig. 1 is the general-purpose switched capacitor diode clamp combination multi-level circuit circuit diagram (single-arm circuit) of the present utility model;

Figure 2 shows the circuit diagram of a general-purpose switched capacitor diode clamp combination five-level circuit (single-arm circuit).

Detailed ways

Referring to Figure 1, the general-purpose switched capacitor diode clamp combined multilevel circuit is provided with an n-level voltage output, n is a positive integer greater than or equal to 4, and each bridge arm includes:

1) 2n-5 capacitors, of which n-3 are DC bus capacitors C ₁ ~C _(n-3) and n-2 are floating capacitors Cc ₁ ~Cc _(n-2) ;

2) 4×(n-2) switching tubes, each switching tube is an active switching tube with an anti-parallel diode, of which 2×(n-2) are the main switching tubes S ₁ to S _2n-4 , 2×(n-2) clamp switch tubes Sc ₁ ~ Sc _2n-4 ;

3) (n-2)×(n-3) clamping diodes Dc ₁ to Dc _(n-2)×(n-3) ;

n-3 DC bus capacitors C ₁ ~ C _(n-3) are connected in series to form a DC bus capacitor link. The connection method is that the negative pole of the previous capacitor is connected with the positive pole of the latter capacitor, and the connection constitutes a connection point , the positive pole of the first capacitor C ₁ and the negative pole of the last capacitor C _(n-3) are used as the initial connection point and the terminal connection point respectively. The DC bus capacitor link has a total of n-2 connection points, n-2 The connection points are numbered sequentially according to the connection sequence, the initial connection point is 1, and the terminal connection point is n-2;

2×(n-2) clamping switch tubes Sc ₁ ~ Sc _2n-4 are sequentially connected in series to form a clamping switch tube link. The collectors of the clamping switches Sc ₁ and the emitters of the last clamping switching tube Sc _2n-4 are respectively used as the initial connection point and the terminal connection point. There are 2n-3 connection points in the clamp switch tube link, and the 2n-3 contacts are numbered in sequence according to the connection sequence, the initial connection point is 1, and the terminal connection point is 2n-3;

n-2 floating capacitors Cc ₁ ~ Cc _(n-2) are connected in series to form a floating capacitor link. The connection method is that the negative pole of the previous capacitor is connected with the positive pole of the latter capacitor, and the connection constitutes a connection point. The positive pole of a floating capacitor Cc ₁ and the negative pole of the last floating capacitor Cc _(n-2) are used as the initial connection point and the terminal connection point respectively. The floating capacitor link has a total of n-1 connection points, n-1 The connection points are numbered in sequence according to the connection sequence, the initial connection point is 1, and the terminal connection point is n-1;

The even-numbered connection points in the clamp switch tube link and the connection points in the DC bus capacitor link are connected in ascending order of number, and the odd-numbered connection points in the clamp switch tube link are connected to the connection points in the suspension capacitor link The points are connected in ascending order of numbers to form the switched capacitor topological part of the switched capacitor diode clamp combination multilevel circuit;

2×(n-2) main switching tubes S ₁ ~ S _2n-4 are connected in series to form a main switching tube link. The connection method is that the emitter of the front main switching tube is connected with the collector of the rear main switching tube , the connection constitutes a connection point, the collector of the first main switching tube S ₁ and the emitter of the last main switching tube S _2n-4 serve as the initial connection point and the terminal connection point respectively, and the main switching tube link has a total of 2n-3 connection points, 2n-3 connection points are numbered in sequence according to the connection sequence, the starting connection point is 1, and the terminal connection point is 2n-3;

(n-2)×(n-3) clamping diodes Dc ₁ ～Dc _(n-2)×(n-3) constitute n-3 clamping diode links, set i to be less than or equal to n-3 positive integer, the i-th clamping diode chain consists of 2i clamping diodes Dc _{i×(i-1) +1} ~Dc _i×(i+1) connected in series in sequence, and the connection method is that the previous clamping diode The anode of the first clamping diode Dc _i×(i-1)+1 on each link is connected to the cathode of the last clamping diode Dc The anodes of _i×(i+1) are respectively used as the initial connection point and the terminal connection point. There are 2i+1 connection points on the i-th link, and the 2i+1 connection points are numbered in sequence according to the connection sequence. The initial connection point is 1, the terminal connection point is 2i+1; the first connection point in the i-th clamping diode link is connected to the n-1-i-th connection point in the main switch tube link, and the 2i+1 connection point The point is connected to the n-1+i connection point in the main switch tube chain, and the odd-numbered connection points in the other connection points on the i-th clamping diode chain are connected to the i-1 clamping diode chain The even-numbered connection points in the road are connected in ascending order; the first connection point in the suspension capacitor link is connected to the first connection point in the main switch tube link, and the last connection point in the suspension capacitor link is connected to the main switch. The last connection point in the tube link is connected, and the remaining connection points in the suspension capacitor link are connected with the even-numbered connection points in the n-3 clamping diode link in ascending order of numbers to form a multi-switch capacitor diode clamping combination. The diode clamp topology part of the level circuit; the n-1th connection point in the main switch tube chain is used as the output connection point.

Figure 2 shows an example of a single arm of a general-purpose switched capacitor diode clamp combination five-level circuit. Its level n is 5, and each bridge arm includes: 5 capacitors, 2 of which are DC bus capacitors C ₁ ~ C ₂ , and 3 are suspension capacitors Cc ₁ ~ Cc ₃ ; 12 switching tubes, each switching tube All are active switching tubes with anti-parallel diodes, of which 6 are main switching tubes S ₁ ~ S ₆ , 6 are clamping switching tubes Sc ₁ ~ Sc ₆ ; 6 clamping diodes Dc ₁ ~ Dc ₆ ;

Two DC bus capacitors C ₁ ~ C ₂ are connected in series to form a DC bus capacitor link. The connection method is that the negative pole of the first capacitor C1 is connected with the positive pole of the second capacitor C2, and the connection constitutes a connection point. The positive pole of one capacitor C1 and the negative pole of the second capacitor C2 are used as the initial connection point and the terminal connection point respectively. There are 3 connection points in total in this DC bus capacitor link, and the 3 connection points are numbered in sequence according to the connection sequence. The connection point is 1, and the terminal connection point is 3;

Six clamp switch tubes Sc ₁ ~ Sc ₆ are connected in series to form a clamp switch tube link. The connection mode is that the emitter of the front clamp switch tube is connected with the collector of the rear clamp switch tube, and the connection constitutes One connection point, the collector of the first clamping switch _Sc1 and the emitter of the sixth clamping switch Sc6 are respectively used as the initial connection point and the terminal connection point. There are 7 connections in this clamping switch tube chain point, the 7 connection points are numbered in sequence according to the connection sequence, the initial connection point is 1, and the terminal connection point is 7;

Three floating capacitors Cc ₁ ~ Cc ₃ are connected in series to form a floating capacitor link. The connection method is that the negative pole of the previous capacitor is connected with the positive pole of the latter capacitor, and the connection constitutes a connection point. The first floating capacitor Cc ₁ The positive pole of the floating capacitor Cc 3 and the negative pole of the third floating capacitor Cc ₃ are respectively used as the initial connection point and the terminal connection point. The floating capacitor link has a total of 4 connection points, and the 4 connection points are numbered in sequence according to the connection sequence. The initial connection point is 1, the terminal connection point is 4;

The connection points with even numbers in the clamp switch tube link and the connection points in the DC bus capacitor link are connected in ascending order of numbers, that is, the second connection point in the clamp switch tube link is connected to the DC bus capacitor link The first connection point is connected (the connection point between Sc ₁ and Sc ₂ is connected to the positive pole of C ₁ ), the fourth connection point in the clamp switch tube link is connected to the second connection point in the DC bus capacitor link (the connection point between Sc ₃ and Sc4 is connected to the connection point between C ₁ and C ₂ ), the sixth connection point in the clamp switch tube link and the third connection point in the DC bus capacitor link (the connection point between Sc ₅ and Sc ₆ is connected to the negative pole of C ₂ ); the odd-numbered connection points in the clamp switch tube link and the connection points in the floating capacitor link are connected in ascending order, that is, The first connection point in the clamp switch tube link is connected to the first connection point in the floating capacitor link (the collector of Sc ₁ is connected to the positive pole of Cc ₁ ), and the third connection point in the clamp switch tube link The point is connected to the second connection point in the suspension capacitor link (the connection point between Sc ₂ and Sc ₃ is connected to the connection point between Cc ₁ and Cc ₂ ), and the fifth connection point in the clamp switch tube link The point is connected to the third connection point in the suspension capacitance link (the connection point between Sc ₄ and Sc ₅ is connected to the connection point between Cc ₂ and Cc ₃ ), and the seventh connection point in the clamp switch tube link The point is connected to the fourth connection point in the suspension capacitor link (the emitter of Sc ₆ is connected to the negative pole of Cc ₃ ), here, the DC bus capacitor link, the suspension capacitor link and the clamp switch tube link and their connections The line forms part of the switched capacitor topology.

Six main switching tubes S ₁ ~ S ₆ are connected in series to form a main switching tube link. The connection method is that the emitter of the front main switching tube is connected with the collector of the rear main switching tube, and the connection constitutes a connection point. The collector of the first main switching tube _S1 and the emitter of the sixth main switching tube _S6 are used as the initial connection point and the terminal connection point respectively. The main switching tube link has 7 connection points in total, and the 7 connection points They are numbered sequentially according to the connection sequence, the initial connection point is 1, and the terminal connection point is 7;

Six clamping diodes Dc ₁ ~ Dc ₆ constitute two clamping diode chains, among which, the first clamping diode chain consists of two clamping diodes Dc ₁ ~ Dc ₂ connected in series in sequence, and the connection method is as follows: The anode of one clamping diode Dc ₁ is connected to the cathode of the second clamping diode Dc ₂ , the junction constitutes a junction, the cathode of the first clamping diode Dc ₁ and the anode of the second clamping diode Dc ₂ As the starting connection point and the terminal connection point respectively, there are 3 connection points on the first clamping diode link, and the 3 connection points are numbered in sequence according to the connection sequence, the starting connection point is 1, the terminal connection point is 3, and the The two clamping diode chains are composed of four clamping diodes Dc ₃ ~ Dc ₆ connected in series in sequence. The connection method is that the anode of the previous clamping diode is connected with the cathode of the rear clamping diode, and the connection constitutes a connection point , the cathode of the first clamping diode Dc ₃ and the anode of the fourth clamping diode Dc ₆ in the second clamping diode chain are used as the starting connection point and the terminal connection point respectively, the second clamping diode chain There are 5 connection points on the road, and the 5 connection points are numbered in sequence according to the connection sequence, the initial connection point is 1, and the terminal connection point is 5;

The first connection point on the first clamping diode chain is connected to the third connection point in the main switching tube chain (the cathode of Dc ₁ is connected to the connection point between S ₂ and S ₃ ), the first The third connection point on one clamping diode chain is connected to the fifth connection point in the main switching tube chain (the anode of Dc ₂ is connected to the connection point between S ₄ and S ₅ ); the second The first connection point on the clamping diode chain is connected to the second connection point in the main switch tube chain (the cathode of Dc ₃ is connected to the connection point between S ₁ and S ₂ ), the second The fifth connection point on the clamp diode chain is connected to the sixth connection point in the main switch tube chain (the anode of Dc ₆ is connected to the connection point between S ₅ and S ₆ ), the second clamp The third connection point on the bit diode chain is connected to the second connection point in the first clamp diode chain (the connection point between Dc ₄ and Dc ₅ and the connection point between Dc ₁ and Dc ₂ connected), the first connection point in the suspension capacitor link is connected to the first connection point in the main switch tube link (the anode of Cc ₁ is connected to the collector of S ₁ in the main switch tube link), the suspension The fourth connection point in the capacitor link is connected to the seventh connection point in the main switch tube link (the negative pole of Cc ₃ is connected to the emitter of S ₆ ), the second connection point in the suspension capacitor link is connected to the first The second connection point in the 2 clamping diode chains is connected (the connection point between Cc ₁ and Cc ₂ is connected to the connection point between Dc ₃ and Dc ₄ ), the third connection point in the suspension capacitor chain The point is connected to the fourth connection point in the second clamping diode chain (the connection point between Cc ₂ and Cc ₃ is connected to the connection point between Dc ₅ and Dc ₆ ), here, the floating capacitor chain , the main switching tube link and the clamping diode link and their connection lines constitute a four-level diode clamping topology part; the fourth connection point in the main switching tube link (the connection point between S ₃ and S ₄ ) as output connection points.

倍；第3种，以Cc₂的正极和Cc₂的负极为直流电压输入端，输出电压峰峰值为输入电压幅值的4倍。其中三相工作时，一般只用第一种接入方式。The DC input voltage of the general-purpose switched capacitor diode clamp combination multi-level circuit generally has the following three access methods: the first one, the positive pole of _C1 and the negative pole of _C2 are the DC voltage input terminals, and the peak-to-peak output voltage is 2 times the amplitude of the input voltage; in the second type, the positive pole of Cc ₁ and the negative pole of Cc ₃ are the DC voltage input terminals, and the peak-to-peak value of the output voltage is equal to the amplitude of the input voltage

times; in the third type, the positive pole of Cc ₂ and the negative pole of Cc ₂ are the DC voltage input terminals, and the peak-to-peak output voltage is 4 times the amplitude of the input voltage. When three-phase work, generally only the first access method is used.

General-purpose switched capacitor diode clamp combination five-level circuit working principle:

From the perspective of circuit combination, the five-level circuit can be split into two parts, the four-level diode clamp topology part and the switched capacitor part. The four-level diode-clamp topology can output four different levels, forming four operating modes. The clamp switch tubes of the switched capacitor part are divided into two groups, Sc ₁ , Sc ₃ , Sc ₅ are a group, Sc ₂ , Sc ₄ , Sc ₆ are a group, and the two groups are complementary and conduction, forming two kinds of work of the switched capacitor part modal. Combining the working modes of the two parts of the circuit can get 8 output states and output five levels. The switch state and output level are shown in Table 1 (in the table, 1 represents the switch tube is turned on, 0 represents the switch tube is turned off, and U represents 1 times the output level).

Table 1 Switch state and output level comparison table

Realization of automatic balance of capacitor voltage and output boost function:

The switching capacitor part of the five-level circuit realizes the function of automatic balancing of the capacitor voltage. When Sc ₁ , Sc ₃ , and Sc ₅ are turned on, C ₁ and Cc ₁ are connected in parallel, and C ₂ and Cc ₂ are connected in parallel, so that VC ₁ =VCc ₁ , VC ₂ =VCc ₂ ; when Sc ₂ , Sc ₄ , Sc ₆ When conducting, C ₁ and Cc ₂ are connected in parallel, and C ₂ and Cc ₃ are connected in parallel, so that VC ₁ = VCc ₂ , VC ₂ = VCc ₃ ; two sets of switch tubes are turned on alternately, so that the voltages of the five capacitors can be equal, that is, VC ₁ =VC ₂ =VCc ₁ =VCc ₂ =VCc ₃ , realizing the automatic balance of the capacitor voltage.

The switch capacitor part circuit realizes the automatic balance of the voltage of each capacitor, and at the same time, supplements the electric energy of the DC input to each capacitor, and realizes the function of output boosting. From the above, it can be seen that there are three DC input voltage access modes for the operation of the single bridge arm of the five-level topology, and the first access mode is taken as an example. The positive pole of C ₁ and the negative pole of C ₂ are used to input the positive and negative terminals of the DC voltage, and the connection point between C ₁ and C ₂ is used as the potential zero reference point, and the input voltage is double the single capacitor voltage. When Sc ₁ , Sc ₃ , Sc ₅ are turned on, C ₁ and Cc ₁ are connected in parallel, VC ₁ =VCc ₁ , when Sc ₂ , Sc ₄ , Sc ₆ are turned on, C ₁ and Cc ₁ are equivalently connected in series, if this When the positive pole of Cc ₁ is used as the output level, then the output voltage is the positive double capacitor voltage. In the same way, the single-capacitor voltage of minus 2 times can be output, so the output can obtain a voltage amplitude whose peak-to-peak value is 4 times the single-capacitor voltage, and realize the function of output boosting. At this time, the boosting multiple is 2. Other access methods achieve different multiples of boost, which can be explained in the same way.

Claims (2)

1. a multi-level circuit of universal switch capacitor diode clamping assembly is provided with the output of n level voltage, and n is the positive integer more than or equal to 4, it is characterized in that: each brachium pontis comprises:

1) 2n-5 capacitor, wherein n-3 is dc-link capacitance (C ₁～C _(n-3)), n-2 is flying capacitor (Cc ₁～Cc _(n-2));

2) 4 * (n-2) individual switching tubes, each switching tube are the active switch pipe of the anti-and diode of band, wherein 2 * (n-2) individual be main switch (S ₁～S _2n-4), 2 * (n-2) individual be clamp switch pipe (Sc ₁～Sc _2n-4); 3) (n-2) * (n-3) individual reed position diode (Dc ₁～Dc _{(n-2) * (n-3)});

N-3 dc-link capacitance (C ₁～C _(n-3)) be followed in series to form a dc-link capacitance link connected mode and be, the positive pole of an electric capacity of the negative pole of the electric capacity in front and back is connected, and the junction constitutes a tie point, first electric capacity (C ₁) positive pole and last electric capacity (C _(n-3)) negative pole respectively as initial tie point and Termintion connection point, this dc-link capacitance link has n-2 tie point altogether, n-2 tie point is by order of connection number consecutively, initial tie point is 1, Termintion connection point is n-2;

2 * (n-2) individual clamp switch pipe (Sc ₁～Sc _2n-4) being followed in series to form a clamp switch pipe link, connected mode is that the collector electrode of a reed bit switch of emitter and the back pipe of front reed bit switch pipe links to each other, tie point of junction formation, first clamp switch pipe (Sc ₁) collector electrode and last clamp switch pipe (Sc _2n-4) emitter respectively as initial tie point and Termintion connection point, this clamp switch pipe link has 2n-3 tie point, 2n-3 contact is by order of connection number consecutively, initial tie point is 1, Termintion connection point is 2n-3;

N-2 flying capacitor (Cc ₁～Cc _(n-2)) be followed in series to form a flying capacitor link connected mode and be, the positive pole of an electric capacity of the negative pole of the electric capacity in front and back is connected, and the junction constitutes a tie point, first flying capacitor (Cc ₁) positive pole and last flying capacitor (Cc _(n-2)) negative pole respectively as initial tie point and Termintion connection point, this flying capacitor link has n-1 tie point altogether, n-1 tie point is by order of connection number consecutively, initial tie point is 1, Termintion connection point is n-1;

The tie point that is numbered even number in the clamp switch pipe link links to each other by the numbering ascending order successively with tie point in the dc-link capacitance link, the tie point that is numbered odd number in the clamp switch pipe link links to each other by the numbering ascending order successively with tie point in the flying capacitor link, constitutes the topological part of switching capacity of switch capacitor diode clamping combination multi-level circuit;

2 * (n-2) individual main switch (S ₁～S _2n-4) being followed in series to form a main switch link, connected mode is that the collector electrode of a main switch of the emitter of the main switch in front and back links to each other, tie point of junction formation, first main switch (S ₁) collector electrode and last main switch (S _2n-4) emitter respectively as initial tie point and Termintion connection point, this main switch link has 2n-3 tie point, 2n-3 tie point is by order of connection number consecutively, initial tie point is 1, Termintion connection point is 2n-3;

(n-2) * (n-3) individual clamping diode (Dc ₁～Dc _{(n-2) * (n-3)}) constitute n-3 bar clamping diode link, establish i and be the positive integer smaller or equal to n-3, i bar clamping diode chain route 2i reed position diode (Dc _{I * (i-1)+1}～Dc _{I * (i+1)}) be followed in series to form, its connected mode is, and the negative electrode of a clamping diode of the anode of the clamping diode in front and back links to each other, and the junction constitutes a tie point, first clamping diode (Dc on every link _{I * (i-1)+1}) negative electrode and last clamping diode (Dc _{I * (i+1)}) anode respectively as initial tie point and Termintion connection point, total 2i+1 tie point on the i bar link, 2i+1 tie point pressed order of connection number consecutively, initial tie point is 1, Termintion connection point is 2i+1; The 1st tie point in the i bar clamping diode link links to each other with n-1-i tie point in the main switch link, 2i+1 tie point is connected with n-1+i tie point in the main switch link, and the tie point that is numbered even number in the tie point that is numbered odd number in all the other tie points on the i bar clamping diode link and the i-1 bar clamping diode link links to each other successively by the numbering ascending order; First tie point links to each other with first tie point in the main switch link in the flying capacitor link, last tie point links to each other with last tie point in the main switch link in the flying capacitor link, the tie point that is numbered even number in the flying capacitor link in all the other tie points and the n-3 bar clamping diode link links to each other successively by the numbering ascending order, constitutes the topological part of diode clamp of switch capacitor diode clamping combination multi-level circuit; N-1 tie point in the main switch link is as output connection.

2. multi-level circuit of universal switch capacitor diode clamping assembly according to claim 1 is characterized in that level voltage output n is 5, and each brachium pontis comprises: 5 capacitors, wherein 2 is dc-link capacitance (C ₁～C ₂), 3 is flying capacitor (Cc ₁～Cc ₃); 12 switching tubes, each switching tube are the anti-also active switch pipe of diode of band, and wherein 6 is main switch (S ₁～S ₆), 6 is reed bit switch pipe (Sc ₁～Sc ₆); 6 clamping diode (Dc ₁～Dc ₆);

2 dc-link capacitance (C ₁～C ₂) be followed in series to form a dc-link capacitance link, connected mode is, the negative pole of first electric capacity (C1) is connected with the positive pole of second electric capacity (C2), the junction constitutes a tie point, the negative pole of positive pole of first electric capacity (C1) and second electric capacity (C2) is respectively as initial tie point and Termintion connection point, and this dc-link capacitance link has 3 tie points altogether, and 3 tie points are by order of connection number consecutively, initial tie point is 1, and Termintion connection point is 3;

6 clamp switch pipe (Sc ₁～Sc ₆) being followed in series to form a clamp switch pipe link, connected mode is that the collector electrode of a clamp switch pipe of the emitter of the clamp switch pipe in front and back links to each other, tie point of junction formation, first clamp switch pipe (Sc ₁) collector electrode and the emitter of the 6th clamp switch pipe (Sc6) respectively as initial tie point and Termintion connection point, this clamp switch pipe link has 7 tie points, 7 tie points are by order of connection number consecutively, initial tie point is 1, Termintion connection point is 7;

3 flying capacitor (Cc ₁～Cc ₃) being followed in series to form a flying capacitor link, connected mode is that the positive pole of an electric capacity of the negative pole of the electric capacity in front and back is connected, tie point of junction formation, first flying capacitor (Cc ₁) positive pole and the 3rd flying capacitor (Cc ₃) negative pole respectively as initial tie point and Termintion connection point, this flying capacitor link has 4 tie points altogether, 4 tie points are by order of connection number consecutively, initial tie point is 1, Termintion connection point is 4;

The 2nd tie point links to each other with the 1st tie point in the dc-link capacitance link in the clamp switch pipe link, the 4th tie point links to each other with the 2nd tie point in the dc-link capacitance link in the clamp switch pipe link, the 6th tie point links to each other with the 3rd tie point in the dc-link capacitance link in the clamp switch pipe link, the 1st tie point links to each other with the 1st tie point in the flying capacitor link in the clamp switch pipe link, the 3rd tie point links to each other with the 2nd tie point in the flying capacitor link in the clamp switch pipe link, the 5th tie point links to each other with the 3rd tie point in the flying capacitor link in the clamp switch pipe link, the 7th tie point links to each other with the 4th tie point in the flying capacitor link in the clamp switch pipe link, constitutes the switching capacity topology part of switch capacitor diode clamping combination multi-level circuit;

6 main switch (S ₁～S ₆) being followed in series to form a main switch link, connected mode is that the collector electrode of a main switch of the emitter of the main switch in front and back links to each other, tie point of junction formation, first main switch (S ₁) collector electrode and the 6th main switch (S ₆) emitter respectively as initial tie point and Termintion connection point, this main switch link has 7 tie points, 7 tie points are by order of connection number consecutively, initial tie point is 1, Termintion connection point is 7;

6 clamping diode (Dc ₁～Dc ₆) constitute 2 clamping diode links, wherein, 2 clamping diode (Dc of the 1st clamping diode chain route ₁～Dc ₂) be followed in series to form, its connected mode is first reed position diode (Dc ₁) anode and second clamping diode (Dc ₂) negative electrode link to each other, the junction constitutes a tie point, first clamping diode (Dc ₁) negative electrode and second clamping diode (Dc ₂) anode respectively as initial tie point and Termintion connection point, article 1, on the clamping diode link 3 tie points are arranged, 3 tie points are by order of connection number consecutively, and initial tie point is 1, Termintion connection point is 4 clamping diode (Dc of 3, the 2 clamping diode chain routes ₃～Dc ₆) be followed in series to form, its connected mode is, and the negative electrode of a clamping diode of the anode of the clamping diode in front and back links to each other, and the junction constitutes a tie point, first clamping diode (Dc in the 2nd clamping diode link ₃) negative electrode and the 4th clamping diode (Dc ₆) anode respectively as initial tie point and Termintion connection point, on the 2nd the clamping diode link 5 tie points are arranged, 5 tie points are by order of connection number consecutively, initial tie point is 1, Termintion connection point is 5; Article 1, the 1st tie point on the clamping diode link is connected with the 3rd tie point in the main switch link, and the 3rd tie point on the 1st clamping diode link is connected with the 5th tie point in the main switch link; Article 2, the 1st tie point on the diode link of reed position is connected with the 2nd tie point in the main switch link, article 2, the 5th tie point on the clamping diode link is connected with the 6th tie point in the main switch link, article 2, the 3rd tie point on the clamping diode link is connected with the 2nd tie point in the 1st the clamping diode link, the 1st tie point is connected with the 1st tie point in the main switch link in the flying capacitor link, the 4th tie point is connected with the 7th tie point in the main switch link in the flying capacitor link, the 2nd tie point is connected with the 2nd tie point in the 2nd the clamping diode link in the flying capacitor link, the 3rd tie point is connected with the 4th tie point in the 2nd the clamping diode link in the flying capacitor link, constitutes the diode clamp topology part of switch capacitor diode clamping combination multi-level circuit; The 4th tie point is as output connection in the main switch link.

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