CN101355296B - Nondestructive buffer circuit for T type converter cross shaft - Google Patents

Nondestructive buffer circuit for T type converter cross shaft Download PDF

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Publication number
CN101355296B
CN101355296B CN2008102226952A CN200810222695A CN101355296B CN 101355296 B CN101355296 B CN 101355296B CN 2008102226952 A CN2008102226952 A CN 2008102226952A CN 200810222695 A CN200810222695 A CN 200810222695A CN 101355296 B CN101355296 B CN 101355296B
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diode
branch road
anode
reverse
controlled switch
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CN101355296A (en
Inventor
郑琼林
贺明智
郝瑞祥
杨中平
孙湖
游小杰
林飞
张立伟
黄先进
王琛琛
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Beijing Jiaotong University
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Beijing Jiaotong University
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Abstract

The invention provides a lossless snubber circuit for a cross shaft of a T-shaped converter. The invention is characterized in that based on the T-shaped converter, the lossless snubber circuit (Sni) on a bidirectional controlled switch of the cross shaft of the T-shaped converter consists of diodes (SniD1, SniD2, SniD3 and SniD4) and a capacitor (Cni); cathode butt nodes of the diodes (SniD1 and SniD2) are connected with one end of the capacitor (Cni) and the anode of the diode (SniD3); the other end of the capacitor (Cni) is connected with the cathode of the diode (SniD4); the cathode butt nodes of the diodes (SniD1 and SniD2) are connected with one end of the capacitor (Cni) and the anode of the diode (SniD3); the other end of the capacitor (Cni) is connected with the cathode of the diode (SniD4); anodes of the diodes (SniD1 and SniD2) are respectively connected with two ends of the bidirectional controllable switch; a buffer capacitor (Cni) and a node of the diode (SniD4) are connected with a midpoint of switching tubes which are connected back to back in the controllable switch (Si); and cathodes of the diodes (SniD3 and SniD4) are respectively connected with the cathode of a diode (STi(2i)) and the anode of a diode (SBi(2i)) in an unidirectional rectifier circuit. The combination of the lossless snubber circuit can form snubber circuits with different structures.

Description

The lossless buffer circuit of T code converter transverse axis
Technical field
The present invention relates to a kind of buffer circuit, particularly a kind of harmless type buffer circuit that is applicable to two-way gate-controlled switch on the T code converter transverse axis.
Background technology
When the traditional type that diminishes absorption circuit is stored in the energy of circuit stray inductance when absorbing the switching of switching tube state, can introduce unnecessary energy loss, reduce the efficient of system; Traditional harmless type absorbs circuit fails to be optimized according to the design feature of T code converter, and components and parts are more, increased complexity.
Summary of the invention
Technical problem to be solved by this invention is: the buffering that solves the bidirectional switch of T code converter transverse axis absorbs problem, and simple and reliable solution is provided.
In order to achieve the above object, technical scheme of the present invention is as follows:
Constitute the longitudinal axis of T code converter by 2k capacitances in series; K two-way controllable switch unit constitutes the transverse axis of T code converter; Between the node of longitudinal axis the first half electric capacity of node between the bidirectional switch and correspondence unidirectional rectification branch road is arranged, between the node of the node between the bidirectional switch and corresponding longitudinal axis the latter half electric capacity is to constitute the unidirectional rectification branch road that flows to transverse axis from the longitudinal axis by single-way switch, opposite with the direction of aforesaid rectification branch road; K is a positive integer; Buffer cell is made of diode and electric capacity, when two gate-controlled switches of bidirectional switch adopt the structure of inverse parallel diode anode butt joint, the negative electrode butt joint of two fly-wheel diodes of buffer circuit, and an end of butt joint node and electric capacity and link to each other to the anode of the diode of forward conduction branch road loopback energy, the other end of electric capacity with dock nodes to the negative electrode of the diode of negative sense conducting branch road loopback energy and two switches constituting two-way gate-controlled switch and link to each other; Five outlet terminals of buffer cell link to each other with the node of the two ends of two-way gate-controlled switch and mid point, unidirectional rectification branch road respectively; The anode of two fly-wheel diodes respectively connects an end of two-way gate-controlled switch; Connect the negative electrode of diode on the forward rectification branch road to the negative electrode of the diode of forward branch road loopback energy, connect the anode of diode on the negative sense rectification branch road to the anode of the diode of negative sense branch road loopback energy.
Beneficial effect of the present invention:
Adopt less components and parts, according to the characteristics of T code converter, constitute harmless type buffer circuit, do not increasing system complexity, do not reducing under the situation of system effectiveness, the buffering that solves two-way gate-controlled switch absorbs problem.
Description of drawings
Fig. 1 is the application schematic diagram of the lossless buffer circuit of T code converter transverse axis.
Fig. 2 is the schematic diagram of lossless buffer circuit when two-way gate-controlled switch structural change of T code converter transverse axis.
Fig. 3 is the connection diagram of the lossless buffer circuit of T code converter transverse axis.
Fig. 4 is the another kind of type of attachment schematic diagram of the lossless buffer circuit of T code converter transverse axis.
Fig. 5 is a kind of application drawing that the lossless buffer circuit of T code converter transverse axis adopts two electric capacity schemes.
Fig. 6 is the application drawing that the lossless buffer circuit of T code converter transverse axis adopts two electric capacity another programs.
Embodiment
The invention will be further described in conjunction with the accompanying drawings:
Application number is: 200810118835.1, and denomination of invention is: the T code converter topological structure of multi-level rectifying, the circuit of record is as follows: pass through capacitor C T1, C T2C T (k-1), C Tk, C B1, C B2C B (k-1), C BkBe total to the longitudinal axis that 2k capacitances in series constitutes the T code converter; Bidirectional switch S 1, S 2S K-1, S kConstitute the transverse axis of T code converter; Have by single-way switch S between the node of longitudinal axis the first half electric capacity of node between the bidirectional switch and correspondence Ti1, S Ti2S Ti (2i)Formation is from the unidirectional rectification branch road of transverse-axis-flow to the longitudinal axis, is by single-way switch S between the node of the node between the bidirectional switch and corresponding longitudinal axis the latter half electric capacity Bi1, S Bi2S Bi (2i)Formation flows to the unidirectional rectification branch road of transverse axis from the longitudinal axis, and is opposite with the direction of aforesaid rectification branch road; K is a positive integer.
Based on above-mentioned T code converter, the lossless buffer circuit of the T code converter of the two-way gate-controlled switch on the transverse axis has following structure: buffer cell S NiBy diode S NiD1, S NiD2, S NiD3, S NiD4And capacitor C NiConstitute diode S NiD1, S NiD2Back-to-back connected node and capacitor C NiAn end link to each other diode S NiD3, S NiD4Back-to-back connected node and diode S NiD1, S NiD2Back-to-back node links to each other; Buffer cell S NiFive outlet terminals link to each other diode S wherein respectively with the node of the two ends of two-way gate-controlled switch and mid point, unidirectional rectification branch road NiD1Anode connect two-way controllable switch S iAn end, two-way controllable switch S iAnother terminating diode S NiD2Anode, buffer capacitor C NiThe two-way controllable switch S of a termination iIn the switching tube mid point that connects back-to-back, diode S NiD3Negative electrode order diode S on the rectification branch road Ti (2i)Negative electrode, diode S NiD4Anode order diode S on the rectification branch road Bi (2i)Negative electrode.
Two-way controllable switch S iFor example is analyzed, its course of work is as follows:
As trigger end G I1As two-way controllable switch S iControl signal, and trigger end G I2When corresponding switching tube is in normally open: as trigger end G I1During the output cut-off signals, transverse axis is cut off, and the energy sense of current that is stored in stray inductance can not suddenly change, and its circulation path is: diode S NiD1, capacitor C Ni, trigger end G I2The inverse parallel diode of corresponding switching tube.Work as capacitor C NiVoltage be charged to and capacitor C TiVoltage when equating, diode S NiD3Conducting, the energy of buffer circuit shifts to output capacitance along one-way circuit.
As trigger end G I2As two-way controllable switch S iControl signal, and trigger end G I1When corresponding switching tube is in normally open: as trigger end G I2During the output cut-off signals, transverse axis is cut off, and the energy sense of current that is stored in stray inductance can not suddenly change, and its circulation path is: diode S NiD2, capacitor C Ni, trigger end G I1The inverse parallel diode of corresponding switching tube.Work as capacitor C NiVoltage be charged to and capacitor C BiVoltage when equating, diode S NiD4Conducting, the energy of buffer circuit shifts along unidirectional Zhi Luxiang output capacitance.
Fig. 2 is the schematic diagram of lossless absorption circuit when two-way gate-controlled switch structural change of T code converter.At this moment, variation has taken place in the butt joint form that constitutes the gate-controlled switch back-to-back of two-way controllable switch unit, needs to change according to this, and the direction that buffering is absorbed the fly-wheel diode in the circuit is carried out conversion.Bidirectional switch S iTwo gate-controlled switch conversion docking modes, adopt the structure of inverse parallel diode cathode butt joint, buffer circuit S iMiddle diode S NiD1, S NiD2The butt joint node be transformed to anode by negative electrode, diode S NiD1, S NiD2The node and the capacitor C of anode butt joint NiAn end and diode S NiD4Negative electrode link to each other capacitor C NiThe other end and diode S NiD3Anode link to each other diode S NiD3Negative electrode order diode S on the rectification branch road Ti (2i)Negative electrode, diode S NiD4Anode order diode S on the rectification branch road Bi (2i)Anode.
Fig. 3 be lossless absorption circuit and with the connection diagram of two-way gate-controlled switch.
Fig. 4 uses at the another kind of unidirectional T code converter for the lossless absorption circuit that the present invention announced.Similar among its operation principle and Fig. 1.
Fig. 5 is a kind of application drawing that the lossless absorption circuit of T code converter transverse axis adopts two electric capacity schemes.At this moment, main circuit structure is the same with the front, and buffer circuit makes to absorb circuit respectively to two switching tubes forming two-way gate-controlled switch.The following description of its course of work.
As trigger end G I1As two-way controllable switch S iControl signal, and trigger end G I2When corresponding switching tube is in normally open: as trigger end G I1During the output cut-off signals, transverse axis is cut off, and the energy sense of current that is stored in stray inductance can not suddenly change, and its circulation path is: diode S NiD1, capacitor C Ni, trigger end G I2The inverse parallel diode of corresponding switching tube.Work as capacitor C NiVoltage be charged to and capacitor C TiVoltage when equating, diode S NiD3Conducting, the energy of buffer circuit shifts along unidirectional Zhi Luxiang output capacitance.
As trigger end G I2As two-way controllable switch S iControl signal, and trigger end G I1When corresponding switching tube is in normally open: as trigger end G I2During the output cut-off signals, transverse axis is cut off, and the energy sense of current that is stored in stray inductance can not suddenly change, and its circulation path is: diode S NiD2, capacitor C Ni, trigger end G I1The inverse parallel diode of corresponding switching tube.Work as capacitor C NiVoltage be charged to and capacitor C BiVoltage when equating, diode S NiD4Conducting, the energy of buffer circuit shifts along unidirectional Zhi Luxiang output capacitance.
Fig. 6 is the application drawing that the lossless absorption circuit of T code converter transverse axis adopts two electric capacity another programs.Similar among its operation principle and Fig. 5 bypassed the inverse parallel diode of another switch in the loop in the buffer circuit.
The lossless absorption circuit of the T code converter that the present invention announced is equally applicable to the diode of the derive circuit and the controllable branch path of two-way T code converter, L type booster converter, L type buck converter, above-mentioned four kinds of circuit and replaces the circuit that constitutes by the gate-controlled switch of band inverse parallel diode.

Claims (5)

1.T the lossless buffer circuit of code converter transverse axis, this circuit is characterized in that based on the T code converter: the longitudinal axis that constitutes the T code converter by 2k capacitances in series; K two-way gate-controlled switch series connection constitutes the transverse axis of T code converter; Lossless buffer circuit (S on the two-way gate-controlled switch of T code converter transverse axis Ni) by diode (S NiD1, S NiD2, S NiD3, S NiD4) and a buffer capacitor (C Ni) constitute two-way gate-controlled switch (S i) two gate-controlled switches adopt the structures of inverse parallel diode anode butt joint, the first buffering diode (S NiD1), the second buffering diode (S NiD2) the node and the buffer capacitor (C of negative electrode butt joint Ni) an end and the 3rd buffering diode (S NiD3) anode link to each other buffer capacitor (C Ni) the other end and the 4th buffering diode (S NiD4) negative electrode link to each other; Buffer circuit (S Ni) five outlet terminals link to each other the first buffering diode (S wherein respectively with two ends and mid point, forward and the node of reverse unidirectional rectification branch road of two-way gate-controlled switch NiD1) anode meet two-way gate-controlled switch (S i) an end, two-way gate-controlled switch (S i) another termination second buffering diode (S NiD2) anode, buffer capacitor (C Ni) and the 4th buffering diode (S NiD4) node and two-way gate-controlled switch (S i) in the connection mid point of two gate-controlled switches that connect back-to-back link to each other the 3rd buffering diode (S NiD3) negative electrode order diode (S on the rectification branch road Ti (2i)) negative electrode, the 4th buffering diode (S NiD4) anode order diode (S on the rectification branch road Bi (2i)) anode;
First diode (the S of forward first branch road T11) and the second diode (S of forward first branch road T12) the series connection formation forward first unidirectional rectification branch road, the second diode (S of forward first branch road T12) anode meets the first two-way gate-controlled switch (S 1) and the second two-way gate-controlled switch (S 2) tie point, the first diode (S of forward first branch road T11) negative electrode connect longitudinal axis the first half first capacitor C T1, longitudinal axis the first half second capacitor C T2Tie point;
First diode (the S of forward i branch road Ti1) ... (2i-1) diode (S of forward i branch road Ti (2i-1)), the 2i diode (S of forward i branch road Ti (2i)) the unidirectional rectification branch road of series connection formation forward i; 2i diode (the S of forward i branch road Ti (2i)) anode meets the two-way gate-controlled switch (S of i i) and (i+1) two-way gate-controlled switch (S (i+1)) tie point, the first diode (S of forward i branch road Ti1) negative electrode connect longitudinal axis the first half i capacitor C Ti, longitudinal axis the first half (i+1) capacitor C T (i+1)Tie point;
First diode (the S of forward k branch road Tk1), the second diode (S of forward k branch road Tk2) ... the 2k diode (S of forward k branch road Tk (2k)) the unidirectional rectification branch road of series connection formation forward k; 2k diode (the S of forward k branch road Tk (2k)) anode meets the two-way gate-controlled switch (S of k k) with the tie point of inductance, the first diode (S of forward k branch road Tk1) negative electrode connect longitudinal axis the first half k capacitor C TkOne end;
First diode (the S of reverse first branch road B11) and the second diode (S of reverse first branch road B12) the series connection formation reverse first unidirectional rectification branch road; Second diode (the S of reverse first branch road B12) negative electrode meets the first two-way gate-controlled switch (S 1) and the second two-way gate-controlled switch (S 2) tie point, the first diode (S of reverse first branch road B11) anode connect longitudinal axis the latter half first capacitor C B1, longitudinal axis the latter half second capacitor C B2Tie point;
First diode (the S of reverse i branch road Bi1) ... (2i-1) diode (S of reverse i branch road Bi (2i-1)), the 2i diode (S of reverse i branch road Bi (2i)) the unidirectional rectification branch road of the series connection reverse i of formation; 2i diode (the S of reverse i branch road Bi (2i)) negative electrode meets the two-way gate-controlled switch (S of i i) and (i+1) two-way gate-controlled switch (S (i+1)) tie point, the first diode (S of reverse i branch road Bi1) anode connect longitudinal axis the latter half i capacitor C Bi, longitudinal axis the latter half (i+1) capacitor C B (i+1)Tie point;
First diode (the S of reverse k branch road Bk1), the second diode (S of reverse k branch road Bk2) ... the 2k diode (S of reverse k branch road Bk (2k)) the unidirectional rectification branch road of the series connection reverse k of formation; 2k diode (the S of reverse k branch road Bk (2k)) negative electrode meets the two-way gate-controlled switch (S of k k) with the tie point of inductance, the first diode (S of reverse k branch road Bk1) anode connect longitudinal axis the latter half k capacitor C BkOne end.
2. the lossless buffer circuit of T code converter transverse axis according to claim 1 is characterized in that: two-way gate-controlled switch is made of MOSFET, IGBT or other two-way gate-controlled switch topologys that contains equivalent inverse parallel diode.
3. the lossless buffer circuit of T code converter transverse axis according to claim 1 is characterized in that: two-way gate-controlled switch (S i) two gate-controlled switch conversion docking modes, when adopting the structure of inverse parallel diode cathode butt joint, buffer circuit (S i) in the first buffering diode (S NiD1), the second buffering diode (S NiD2) the butt joint node be transformed to anode by negative electrode, the first buffering diode (S NiD1), the second buffering diode (S NiD2) the node and the buffer capacitor (C of anode butt joint Ni) an end and the 4th buffering diode (S NiD4) negative electrode link to each other buffer capacitor (C Ni) the other end and the 3rd buffering diode (S NiD3) anode link to each other the 3rd buffering diode (S NiD3) negative electrode meet the 2i diode (S of the unidirectional rectification branch road of forward i forward i branch road Ti (2i)) negative electrode, the 4th buffering diode (S NiD4) anode meet 2i diode (S on the unidirectional rectification branch road of reverse i Bi (2i)) anode.
4. the lossless buffer circuit of T code converter transverse axis according to claim 1 is characterized in that: the lossless buffer circuit of T code converter transverse axis is applicable to the circuit that the diode of the derive circuit and the controllable branch path of unidirectional T code converter, two-way T code converter, L type booster converter, L type buck converter, above-mentioned four kinds of circuit is made of the gate-controlled switch replacement of being with the inverse parallel diode.
5. the lossless buffer circuit of T code converter transverse axis according to claim 1 is characterized in that: the 3rd buffering diode (S of buffer circuit NiD3) negative electrode and the 2i diode (S of the unidirectional rectification branch road of forward i i branch road Ti (2i)), (2i-1) diode (S of the unidirectional rectification branch road of forward i i branch road Ti (2i-1)) ... the first diode (S of the unidirectional rectification branch road of forward i i branch road Ti1) negative electrode in any link to each other; The 4th buffering diode (S NiD4) anode and the unidirectional rectification branch road of reverse i 2i diode (S Bi (2i)), the reverse unidirectional rectification branch road of i (2i-1) diode (S Bi (2i-1)) ... the unidirectional rectification branch road first diode (S of reverse i Bi1) anode in any link to each other.
CN2008102226952A 2008-09-23 2008-09-23 Nondestructive buffer circuit for T type converter cross shaft Expired - Fee Related CN101355296B (en)

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KR102652596B1 (en) 2018-08-27 2024-04-01 엘에스일렉트릭(주) Bi-directional solid state circuit breaker

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4881159A (en) * 1987-12-21 1989-11-14 Siemens Aktiengesellschaft Switching-relieved low-loss three-level inverter
CN1197554A (en) * 1995-09-29 1998-10-28 西门子公司 Low-loss power current inverter
CN1139176C (en) * 1999-06-23 2004-02-18 浙江大学 Passive loss-free buffer circuit for bridge inverter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4881159A (en) * 1987-12-21 1989-11-14 Siemens Aktiengesellschaft Switching-relieved low-loss three-level inverter
CN1197554A (en) * 1995-09-29 1998-10-28 西门子公司 Low-loss power current inverter
CN1139176C (en) * 1999-06-23 2004-02-18 浙江大学 Passive loss-free buffer circuit for bridge inverter

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