CN100499343C - AC-AC three level AC-AC converter based on positive converter - Google Patents

AC-AC three level AC-AC converter based on positive converter Download PDF

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CN100499343C
CN100499343C CNB2007100209464A CN200710020946A CN100499343C CN 100499343 C CN100499343 C CN 100499343C CN B2007100209464 A CNB2007100209464 A CN B2007100209464A CN 200710020946 A CN200710020946 A CN 200710020946A CN 100499343 C CN100499343 C CN 100499343C
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power switch
quadrant
converter
input filter
clamp
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CN101150286A (en
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李磊
韦徵
杨君东
仲庆龙
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Abstract

This invention discloses an AC-AC three-level converter based on normal converter, in which, the circuit of the converter is composed of an input high voltage AC supply, an input filter, a multi-level converter, a HF transformer, a cycle converter, an output filter and output AC load, in which, the multi-level converter is composed of one or many basic units to convert the input voltage to multiple output levels, said basic unit is made up of two four quadrant power switches and one four-quadrant clamp power switch and the circuit topology group based on the AC-AC three-level converter of a normal converter includes normal, push-and-pull, semi-bridge and full bridge topologies, which reduces voltage stress of power switch, series of power conversion and increases power factors of input side, conversion efficiency and power density.

Description

Friendship-friendship type three-level AC-AC-AC converter based on forward converter
Technical field
The invention belongs to the Technics of Power Electronic Conversion technology, particularly-kind of friendship-friendship type three-level AC-AC-AC converter based on forward converter.
Background technology
Friendship-friendship (AC-AC) converter technique is the applied power semiconductor device, convert the AC energy of a certain frequency and amplitude a kind of Semiconductor Converting Technology of the AC energy of same or another frequency and amplitude to, be widely used in national defence, industrial and mining enterprises, scientific research institutions, laboratory in colleges and universities and the daily life.
Up to now, the power electronics researcher mainly concentrates on two level friendship-AC-AC converters such as non-electrical isolation formula, low frequency and high frequency electrical isolation formula for the research of friendship-AC-AC converter both at home and abroad; Research for multi-level converter, mainly concentrate on many level DC-DCs, DC-AC and AC-DC converter, research for many level friendship-AC-AC converters is then considerably less, and only is confined to non-isolated, low frequency or the isolated friendship of the intermediate frequency-straight-many level friendship-AC-AC converters of friendship type and the non-isolated friendship of Buck type-friendship type three-level AC-AC-AC converter.Though hand over-straight-many level friendship-AC-AC converters of friendship type and the non-isolated friendship of Buck type-each tool advantage of friendship type three-level AC-AC-AC converter, there are defectives such as circuit topology complexity, Power Conversion progression is many, the input side power factor is low, conversion efficiency is on the low side, power density is low in the former; And the latter exist topological form single, can only realize defectives such as decompression transformation, no electrical isolation.
People such as M.Glinka have proposed the isolated friendship of a kind of intermediate frequency-straight-many level friendship-AC-AC converters of friendship type (" A newAC/AC multilevel converter family ", IEEE Transactions on Industrial Electronics, 2005, Vol.52, No.3, pp.662～669.), its circuit structure is by modular multilevel friendship-AC-AC converter (M 2LC), formations such as intermediate frequency transformer, rectifier, inverter and filter, have that electrical isolation, output voltage are controlled, modularization, be applied to advantages such as high pressure friendship-alternation changes, but have that topology complexity, Power Conversion progression many (low-frequency ac LFAC-direct current DC-midfrequent AC MFAC-direct current DC-low-frequency ac LFAC), input side power factor are low, conversion efficiency and power density is low, volume weight greatly, control defectives such as complexity.
Summary of the invention
Goal of the invention of the present invention is to provide a kind of and has that topology is succinct, good, conversion efficiency and power density height of terminal voltage spectral characteristic before the high frequency electrical isolation, two stage power conversion (low-frequency ac LFAC-high-frequency ac HFAC-low-frequency ac LFAC), bidirectional power flow, input side power factor height, output filter, be applied to the friendship based on the forward converter-friendship type three-level AC-AC-AC converter of high pressure friendships-alternating current energy conversion occasion.
The technical solution that realizes the object of the invention is: a kind of friendship based on forward converter-friendship type three-level AC-AC-AC converter, constitute by the input filter, multi-level converter, high frequency transformer, frequency converter, output filter and the output AC load that connect successively, this converter is transformed into sinusoidal ac with alternating current, and reduce Power Conversion progression, realize high frequency electrical isolation, be applied to the circuit structure that high pressure friendship-alternation carry over closes, promptly import filter inductance L iWith input filter capacitor C iConstitute input filter, this input filter is to input high-voltage ac power u iCarry out filtering, will be converted into many level of bipolarity output voltage u through the filtered input voltage of input filter N1Multi-level converter and the elementary winding N of high frequency transformer T 1Connect the secondary winding N of this high frequency transformer 2Be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch S 3With the 4th four-quadrant power switch S 4Constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage u ABIn this frequency converter, the 3rd four-quadrant power switch S 3An end and the secondary winding N of high frequency transformer 2An end connect, the other end respectively with the 4th four-quadrant power switch S 4With output inductor L fBe connected the 4th four-quadrant power switch S 4The other end and secondary winding N 2The other end connect; This output inductor L fThe other end respectively with output filter capacitor C fWith output AC load Z LOne end connects, this output filter capacitor C f, output AC load Z LThe other end and secondary winding N 2The other end or centre tap be connected; Described output inductor L fWith output filter capacitor C fConstitute output filter, the output voltage u of the described frequency converter of this output filter filtering ABIn high order harmonic component, thereby obtain sinusoidal voltage u in the output AC load-side o
Friendship-friendship type three-level AC-the AC-AC converter that the present invention is based on forward converter is applied to the positive activation type circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes, and promptly imports high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with input filter capacitor C i, the May 4th quadrant power switch S 5, four-quadrant clamp power switch S cElementary winding N with high frequency transformer T 1An end be connected; This input filter capacitor C iThe other end respectively with this input high-voltage ac power u iThe other end, feedback winding N 3An end, the second four-quadrant power switch S 2An end connect; Described input filter inductance L iWith input filter capacitor C iConstitute input filter; This May 4th quadrant power switch S 5The other end and described feedback winding N 3The other end connect; This four-quadrant clamp power switch S cThe other end respectively with the second four-quadrant power switch S 2The other end, the first four-quadrant power switch S 1One end connects; This first four-quadrant power switch S 1The other end and the elementary winding N of high frequency transformer 1The other end connect; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2With four-quadrant clamp power switch S cConstitute multi-level converter; The output filter capacitor C of output filter f, output AC load Z LThe other end respectively with secondary winding N 2The 4th four-quadrant power switch S with frequency converter 4The other end connect.
Friendship-friendship type three-level AC-the AC-AC converter that the present invention is based on forward converter is applied to the push-pull circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes, and promptly imports high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with input filter capacitor C i, the first four-quadrant clamp power switch S C1With the second four-quadrant clamp power switch S C2An end and the elementary winding N of high frequency transformer T 1Centre tap be connected; This input filter capacitor C iThe other end respectively with input high-voltage ac power u iThe other end, the second four-quadrant power switch S 2, the 6th four-quadrant power switch S 6Connect described input filter inductance L iWith input filter capacitor C iConstitute input filter; This second four-quadrant power switch S 2The other end respectively with the first four-quadrant power switch S 1One end and the first four-quadrant clamp power switch S C1The other end is connected, this first four-quadrant power switch S 1The other end and elementary winding N 1An end connect; Described the 6th four-quadrant power switch S 6The other end respectively with the 7th four-quadrant power switch S 7One end and the second four-quadrant clamp power switch S C2The other end connects; The 7th four-quadrant power switch S 7The other end and elementary winding N 1The other end be connected; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2, the first four-quadrant clamp power switch S C1, the 6th four-quadrant power switch S 6, the 7th four-quadrant power switch S 7With the second four-quadrant clamp power switch S C2Common formation multi-level converter, the wherein first four-quadrant power switch S 1, the second four-quadrant power switch S 2With the first four-quadrant clamp power switch S C1Constitute the first basic comprising unit of this multi-level converter, the 6th four-quadrant power switch S 6, the 7th four-quadrant power switch S 7With the second four-quadrant clamp power switch S C2Constitute the second basic comprising unit of this multi-level converter; The output filter capacitor C of output filter f, output AC load Z LThe other end and secondary winding N 2Centre tap connect.
Friendship-friendship type three-level AC-the AC-AC converter that the present invention is based on forward converter is applied to the half bridge circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes, and promptly imports high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with the first input filter capacitor C 1With the second four-quadrant power switch S 2An end be connected; This first input filter capacitor C 1The other end respectively with the second input filter capacitor C 2, the 3rd four-quadrant clamp power switch S C3, the 4th four-quadrant clamp power switch S C4, high frequency transformer T elementary winding N 1An end connect; Described input filter inductance L i, the first input filter capacitor C 1With the second input filter capacitor C 2Constitute input filter, to input high-voltage ac power u iFiltering, and the first input filter capacitor C 1With the second input filter capacitor C 2To input high-voltage ac power u iCarry out dividing potential drop; This second input filter capacitor C 2The other end respectively with input high-voltage ac power u iThe other end and the 8th four-quadrant power switch S 8One end connects; The described second four-quadrant power switch S 2The other end respectively with the 3rd four-quadrant clamp power switch S C3The other end and the first four-quadrant power switch S 1One end is connected; This first four-quadrant power switch S 1The other end respectively with elementary winding N 1The other end and the 9th four-quadrant power switch S 9One end connects, the 9th four-quadrant power switch S 9The other end respectively with the 4th four-quadrant clamp power switch S C4The other end, the 8th four-quadrant power switch S 8The other end connect; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2, the 3rd four-quadrant clamp power switch S C3, the 8th four-quadrant power switch S 8, the 9th four-quadrant power switch S 9With the 4th four-quadrant clamp power switch S C4Common formation multi-level converter, the wherein first four-quadrant power switch S 1, the second four-quadrant power switch S 2With the 3rd four-quadrant clamp power switch S C3Constitute the first basic comprising unit of this multi-level converter, the 9th four-quadrant power switch S 9, the 8th four-quadrant power switch S 8With the 4th four-quadrant clamp power switch S C4Constitute the second basic comprising unit of this multi-level converter; The output filter capacitor C of output filter f, output AC load Z LThe other end and secondary winding N 2Centre tap connect.
Friendship-friendship type three-level AC-the AC-AC converter that the present invention is based on forward converter is applied to the full bridge circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes, and promptly imports high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with the first input filter capacitor C 1, the second four-quadrant power switch S 2With the 13 four-quadrant power switch S 13An end be connected; This first input filter capacitor C 1The other end respectively with the second input filter capacitor C 2, the May 4th quadrant clamp power switch S C5, the 6th four-quadrant clamp power switch S C6, the 7th four-quadrant clamp power switch S C7With the 8th four-quadrant clamp power switch S C8An end connect; Described input filter inductance L i, the first input filter capacitor C 1With the second input filter capacitor C 2Constitute input filter, to input high-voltage ac power u iFiltering, and the first input filter capacitor C 1With the second input filter capacitor C 2To input high-voltage ac power u iCarry out dividing potential drop; This second input filter capacitor C 2The other end respectively with input high-voltage ac power u iThe other end, the tenth four-quadrant power switch S 10One end and the 14 four-quadrant power switch S 14One end connects; The described second four-quadrant power switch S 2The other end respectively with the May 4th quadrant clamp power switch S C5The other end and the first four-quadrant power switch S 1One end is connected, this first four-quadrant power switch S 1The other end respectively with the elementary winding N of high frequency transformer T 1An end and the 11 four-quadrant power switch S 11One end connects, the 11 four-quadrant power switch S 11The other end respectively with the 6th four-quadrant clamp power switch S C6The other end, the tenth four-quadrant power switch S 10The other end connect; Described the 13 four-quadrant power switch S 13The other end respectively with the 7th four-quadrant clamp power switch S C7The other end and the 12 four-quadrant power switch S 12One end connects, the 12 four-quadrant power switch S 12The other end respectively with elementary winding N 1The other end and the tenth the May 4th quadrant power switch S 15One end connects, the tenth the May 4th quadrant power switch S 15The other end respectively with the 8th four-quadrant clamp power switch S C8The other end, the 14 four-quadrant power switch S 14The other end be connected; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2, the May 4th quadrant clamp power switch S C5, the tenth four-quadrant power switch S 10, the 11 four-quadrant power switch S 11, the 6th four-quadrant clamp power switch S C6, the 12 four-quadrant power switch S 12, the 13 four-quadrant power switch S 13, the 7th four-quadrant clamp power switch S C7, the 14 four-quadrant power switch S 14, the tenth the May 4th quadrant power switch S 15With the 8th four-quadrant clamp power switch S C8Common formation multi-level converter, the wherein first four-quadrant power switch S 1, the second four-quadrant power switch S 2With the May 4th quadrant clamp power switch S C5Constitute the first basic comprising unit of this multi-level converter; The tenth four-quadrant power switch S 10, the 11 four-quadrant power switch S 11With the 6th four-quadrant clamp power switch Sc 6Constitute the second basic comprising unit of this multi-level converter; The 12 four-quadrant power switch S 12, the 13 four-quadrant power switch S 13With the 7th four-quadrant clamp power switch S C7Constitute the 3rd basic comprising unit of this multi-level converter; The 14 four-quadrant power switch S 14, the tenth the May 4th quadrant power switch S 15With the 8th four-quadrant clamp power switch S C8Constitute the 4th basic comprising unit of this multi-level converter; The output filter capacitor C of output filter f, output AC load Z LThe other end and secondary winding N 2Centre tap connect.
The present invention compared with prior art, its remarkable advantage: the present invention is the key technology basis of realizing novel electric power electric transformer and simple alternating current voltage regulator etc., can the conversion occasion at the high pressure friendship-alternating current in fields such as civilian, national defence and industry, be with a wide range of applications.Because have that topology is succinct, advantages such as the terminal voltage spectral characteristic is good before the high frequency electrical isolation, two stage power conversion (low-frequency ac LFAC-high-frequency ac HFAC-low-frequency ac LFAC), bidirectional power flow, output filter, thereby with respect to the isolated friendship of intermediate frequency-straight-friendship type three-level AC-AC-AC converter, the present invention can improve conversion efficiency and power density, reduces volume and weight and improve the input side power factor; Owing to adopted three Level Technology, thereby with respect to two level friendship-AC-AC converters, the present invention can be applied to high pressure friendship-alternation carry over and close, and can reduce volume and weight, the raising output waveform quality of output filter greatly.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Description of drawings
Fig. 1 is the circuit structure diagram of friendship-friendship type three-level AC-AC-AC converter of the present invention is based on forward converter.
Fig. 2 is the positive activation type topological diagram of friendship-friendship type three-level AC-AC-AC converter of the present invention is based on forward converter.
Fig. 3 is the push-pull type topological diagram of friendship-friendship type three-level AC-AC-AC converter of the present invention is based on forward converter.
Fig. 4 is the semibridge system topological diagram of friendship-friendship type three-level AC-AC-AC converter of the present invention is based on forward converter.
Fig. 5 is the full-bridge type topological diagram of friendship-friendship type three-level AC-AC-AC converter of the present invention is based on forward converter.
Embodiment
In conjunction with Fig. 1, the present invention is based on the friendship-friendship type three-level AC-AC-AC converter of forward converter, constitute by the input filter, multi-level converter, high frequency transformer, frequency converter, output filter and the output AC load that connect successively, this converter is transformed into stable or adjustable same frequency, high-quality sinusoidal ac with unsettled high pressure, alternating current inferior, and reduce Power Conversion progression, realize high frequency electrical isolation, be applied to the circuit structure that high pressure friendship-alternation carry over closes, promptly import filter inductance L iWith input filter capacitor C iConstitute input filter, this input filter is to input high-voltage ac power u iCarry out filtering, will be converted into many level of bipolarity output voltage u through the filtered input voltage of input filter N1Multi-level converter and the elementary winding N of high frequency transformer T 1Connect the secondary winding N of this high frequency transformer 2Be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch S 3With the 4th four-quadrant power switch S 4Constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage u ABIn this frequency converter, the 3rd four-quadrant power switch S 3An end and the secondary winding N of high frequency transformer 2An end connect, the other end respectively with the 4th four-quadrant power switch S 4With output inductor L fBe connected the 4th four-quadrant power switch S 4The other end and secondary winding N 2The other end connect; This output inductor L fThe other end respectively with output filter capacitor C fWith output AC load Z LOne end connects, this output filter capacitor C f, output AC load Z LThe other end and secondary winding N 2The other end or centre tap be connected; Described output inductor L fWith output filter capacitor C fConstitute output filter, the output voltage u of the described frequency converter of this output filter filtering ABIn high order harmonic component, thereby obtain high-quality sinusoidal voltage u in the output AC load-side o
With respect to the isolated friendship of intermediate frequency-straight-many level friendship-AC-AC converters of friendship type, circuit structure of the present invention only has two stage power conversion (low-frequency ac LFAC-high-frequency ac HFAC-low-frequency ac LFAC) and has high frequency electrical isolation, thereby this converter can improve input side power factor, conversion efficiency, power density and reliability, and reduces volume, weight.Because circuit structure of the present invention adopts the four-quadrant power switch to replace single power switch, thereby can realize half that bidirectional power flow and its each single voltage stress that power switch bore are two level friendship-AC-AC converters, close thereby can be widely used in high pressure friendship-alternation carry over.In addition, with respect to two level friendship-AC-AC converters, because the output voltage of the frequency converter in the circuit structure of the present invention is the voltage waveform of many level, has improved spectral characteristic, thereby can reduce the volume and weight of output filter and improve the output waveform quality.
The basic functional principle of friendship-friendship type three-level AC-AC-AC converter that the present invention is based on forward converter is as follows: this converter can adopt pulse-width modulation (PWM) copped wave of active-clamp to add the control mode of phase shift.As unsettled high pressure, AC power u inferior iTo exchanging output loading Z LDuring transmitted power, multi-level converter is modulated into bipolarity, many level (u with it i, u i/ 2,0 ,-u i/ 2 ,-u i) high-frequency pulse voltage u N1, to isolate, transmit through high frequency transformer, frequency converter is demodulated into unipolarity, many level
Figure C200710020946D00121
Low-frequency pulse voltage u AB, behind output filter, obtain stable or adjustable same frequency, high-quality sinusoidal voltage u again o
Friendship based on forward converter proposed by the invention, that have the foregoing circuit structure-friendship type three-level AC-AC-AC converter, the connection successively of process input filter, one or more basic comprisings unit, high frequency transformer, frequency converter and output filter can obtain comprising the circuit topology family of positive activation type, push-pull type, semibridge system and four kinds of circuit topologies of full-bridge type, but all topologys in this circuit topology family all have identical circuit structure.
Wherein, the positive activation type circuit topology as shown in Figure 2, its physical circuit connects as follows: be applied to the positive activation type circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes based on the friendship-friendship type three-level AC-AC-AC converter of forward converter, promptly import high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with input filter capacitor C i, the May 4th quadrant power switch S 5, four-quadrant clamp power switch S cElementary winding N with high frequency transformer T 1An end be connected; This input filter capacitor C iThe other end respectively with this input high-voltage ac power u iThe other end, feedback winding N 3An end, the second four-quadrant power switch S 2An end connect; Described input filter inductance L iWith input filter capacitor C iConstitute input filter; This May 4th quadrant power switch S 5The other end and described feedback winding N 3The other end connect; This four-quadrant clamp power switch S cThe other end respectively with the second four-quadrant power switch S 2The other end, the first four-quadrant power switch S 1One end connects; This first four-quadrant power switch S 1The other end and the elementary winding N of high frequency transformer 1The other end connect; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2With four-quadrant clamp power switch S cConstitute multi-level converter.The secondary winding N of this high frequency transformer 2Be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch S 3With the 4th four-quadrant power switch S 4Constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage u ABIn this frequency converter, the 3rd four-quadrant power switch S 3An end and the secondary winding N of high frequency transformer 2An end connect, the other end respectively with the 4th four-quadrant power switch S 4With output inductor L fBe connected the 4th four-quadrant power switch S 4The other end and secondary winding N 2The other end connect; This output inductor L fThe other end respectively with output filter capacitor C fWith output AC load Z LOne end connects, this output filter capacitor C f, output AC load Z LThe other end and secondary winding N 2The other end or centre tap be connected; Described output inductor L fWith output filter capacitor C fConstitute output filter, the output voltage u of the described frequency converter of this output filter filtering ABIn high order harmonic component, thereby obtain high-quality sinusoidal voltage u in the output AC load-side oThe output filter capacitor C of output filter f, output AC load Z LThe other end respectively with secondary winding N 2The 4th four-quadrant power switch S with frequency converter 4The other end connect.The first four-quadrant power switch S wherein 1, the second four-quadrant power switch S 2With four-quadrant clamp power switch S cConstitute the basic comprising unit of this multi-level converter.
The push-pull circuit topology as shown in Figure 3, its physical circuit connects as follows: be applied to the push-pull circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes based on the friendship-friendship type three-level AC-AC-AC converter of forward converter, promptly import high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with input filter capacitor C i, the first four-quadrant clamp power switch S C1With the second four-quadrant clamp power switch S C2An end and the elementary winding N of high frequency transformer T 1Centre tap be connected; This input filter capacitor C iThe other end respectively with input high-voltage ac power u iThe other end, the second four-quadrant power switch S 2, the 6th four-quadrant power switch S 6Connect described input filter inductance L iWith input filter capacitor C iConstitute input filter; This second four-quadrant power switch S 2The other end respectively with the first four-quadrant power switch S 1One end and the first four-quadrant clamp power switch S C1The other end is connected, this first four-quadrant power switch S 1The other end and elementary winding N 1An end connect; Described the 6th four-quadrant power switch S 6The other end respectively with the 7th four-quadrant power switch S 7One end and the second four-quadrant clamp power switch S C2The other end connects; The 7th four-quadrant power switch S 7The other end and elementary winding N 1The other end be connected; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2, the first four-quadrant clamp power switch S C1The 6th four-quadrant power switch S 6, the 7th four-quadrant power switch S 7With the second four-quadrant clamp power switch S C2With constituting multi-level converter, the wherein first four-quadrant power switch S 1, the second four-quadrant power switch S 2With the first four-quadrant clamp power switch S C1Become the first basic comprising unit of this multi-level converter, the 6th four-quadrant power switch S 6, the 7th four-quadrant power switch S 7With the second four-quadrant clamp power switch S C2Become the second basic comprising unit of this multi-level converter.The secondary winding N of this high frequency transformer 2Be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch S 3With the 4th four-quadrant power switch S 4Constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage u ABIn this frequency converter, the 3rd four-quadrant power switch S 3An end and the secondary winding N of high frequency transformer 2An end connect, the other end respectively with the 4th four-quadrant power switch S 4With output inductor L fBe connected the 4th four-quadrant power switch S 4The other end and secondary winding N 2The other end connect; This output inductor L fThe other end respectively with output filter capacitor C fWith output AC load Z LOne end connects, this output filter capacitor C f, output AC load Z LThe other end and secondary winding N 2The other end or centre tap be connected; Described output inductor L fWith output filter capacitor C fConstitute output filter, the output voltage u of the described frequency converter of this output filter filtering ABIn high order harmonic component, thereby obtain high-quality sinusoidal voltage u in the output AC load-side oThe output filter capacitor C of output filter f, output AC load Z LThe other end and secondary winding N 2Centre tap connect.
The half bridge circuit topology as shown in Figure 4, its physical circuit connects as follows: be applied to the half bridge circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes based on the friendship-friendship type three-level AC-AC-AC converter of forward converter, promptly import high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with the first input filter capacitor C 1With the second four-quadrant power switch S 2An end be connected; This first input filter capacitor C 1The other end respectively with the second input filter capacitor C 2, the 3rd four-quadrant clamp power switch S C3, the 4th four-quadrant clamp power switch S C4, high frequency transformer T elementary winding N 1An end connect; Described input filter inductance L i, the first input filter capacitor C 1With the second input filter capacitor C 2Constitute input filter, to input high-voltage ac power u iFiltering, and the first input filter capacitor C 1With the second input filter capacitor C 2To input high-voltage ac power u iCarry out dividing potential drop; This second input filter capacitor C 2The other end respectively with input high-voltage ac power u iThe other end and the 8th four-quadrant power switch S 8One end connects; The described second four-quadrant power switch S 2The other end respectively with the 3rd four-quadrant clamp power switch S C3The other end and the first four-quadrant power switch S 1One end is connected; This first four-quadrant power switch S 1The other end respectively with elementary winding N 1The other end and the 9th four-quadrant power switch S 9One end connects, the 9th four-quadrant power switch S 9The other end respectively with the 4th four-quadrant clamp power switch S C4The other end, the 8th four-quadrant power switch S 8The other end connect; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2, the 3rd four-quadrant clamp power switch S C3, the 8th four-quadrant power switch S 8, the 9th four-quadrant power switch S 9With the 4th four-quadrant clamp power switch S C4Common formation multi-level converter, the wherein first four-quadrant power switch S 1, the second four-quadrant power switch S 2With the 3rd four-quadrant clamp power switch S C3The first basic comprising unit of multi-level converter, the 9th four-quadrant power switch S 9, the 8th four-quadrant power switch S 8With the 4th four-quadrant clamp power switch S C4Constitute the second basic comprising unit of this multi-level converter.The secondary winding N of this high frequency transformer 2Be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch S 3With the 4th four-quadrant power switch S 4Constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage u ABIn this frequency converter, the 3rd four-quadrant power switch S 3An end and the secondary winding N of high frequency transformer 2An end connect, the other end respectively with the 4th four-quadrant power switch S 4With output inductor L fBe connected the 4th four-quadrant power switch S 4The other end and secondary winding N 2The other end connect; This output inductor L fThe other end respectively with output filter capacitor C fWith output AC load Z LOne end connects, this output filter capacitor C f, output AC load Z LThe other end and secondary winding N 2The other end or centre tap be connected; Described output inductor L fWith output filter capacitor C fConstitute output filter, the output voltage u of the described frequency converter of this output filter filtering ABIn high order harmonic component, thereby obtain high-quality sinusoidal voltage u in the output AC load-side oThe output filter capacitor C of output filter f, output AC load Z LThe other end and secondary winding N 2Centre tap connect.
The full bridge circuit topology as shown in Figure 5, its physical circuit connects as follows: be applied to the full bridge circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes based on the friendship-friendship type three-level AC-AC-AC converter of forward converter, promptly import high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with the first input filter capacitor C 1, the second four-quadrant power switch S 2With the 13 four-quadrant power switch S 13An end be connected; This first input filter capacitor C 1The other end respectively with the second input filter capacitor C 2, the May 4th quadrant clamp power switch S C5, the 6th four-quadrant clamp power switch S C6, the 7th four-quadrant clamp power switch S C7With the 8th four-quadrant clamp power switch S C8An end connect; Described input filter inductance L i, the first input filter capacitor C 1With the second input filter capacitor C 2Constitute input filter, to input high-voltage ac power u iFiltering, and the first input filter capacitor C 1With the second input filter capacitor C 2To input high-voltage ac power u iCarry out dividing potential drop; This second input filter capacitor C 2The other end respectively with input high-voltage ac power u iThe other end, the tenth four-quadrant power switch S 10One end and the 14 four-quadrant power switch S 14One end connects; The described second four-quadrant power switch S 2The other end respectively with the May 4th quadrant clamp power switch S C5The other end and the first four-quadrant power switch S 1One end is connected, this first four-quadrant power switch S 1The other end respectively with the elementary winding N of high frequency transformer T 1An end and the 11 four-quadrant power switch S 11One end connects, the 11 four-quadrant power switch S 11The other end respectively with the 6th four-quadrant clamp power switch S C6The other end, the tenth four-quadrant power switch S 10The other end connect; Described the 13 four-quadrant power switch S 13The other end respectively with the 7th four-quadrant clamp power switch S C7The other end and the 12 four-quadrant power switch S 12One end connects, the 12 four-quadrant power switch S 12The other end respectively with elementary winding N 1The other end and the tenth the May 4th quadrant power switch S 15One end connects, the tenth the May 4th quadrant power switch S 15The other end respectively with the 8th four-quadrant clamp power switch S C8The other end, the 14 four-quadrant power switch S 14The other end be connected; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2, the May 4th quadrant clamp power switch S C5, the tenth four-quadrant power switch S 10, the 11 four-quadrant power switch S 11, the 6th four-quadrant clamp power switch S C6, the 12 four-quadrant power switch S 12, the 13 four-quadrant power switch S 13, the 7th four-quadrant clamp power switch S C7, the 14 four-quadrant power switch S 14, the tenth the May 4th quadrant power switch S 15With the 8th four-quadrant clamp power switch S C8Common formation multi-level converter, the wherein first four-quadrant power switch S 1, the second four-quadrant power switch S 2With the May 4th quadrant clamp power switch S C5Constitute the first basic comprising unit of this multi-level converter; The tenth four-quadrant power switch S 10, the 11 four-quadrant power switch S 11With the 6th four-quadrant clamp power switch S C6Constitute the second basic comprising unit of this multi-level converter; The 12 four-quadrant power switch S 12, the 13 four-quadrant power switch S 13With the 7th four-quadrant clamp power switch S C7Constitute the 3rd basic comprising unit of this multi-level converter; The 14 four-quadrant power switch S 14, the tenth the May 4th quadrant power switch S 15With the 8th four-quadrant clamp power switch S C8Constitute the 4th basic comprising unit of this multi-level converter.The secondary winding N of this high frequency transformer 2Be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch S 3With the 4th four-quadrant power switch S 4Constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage u ABIn this frequency converter, the 3rd four-quadrant power switch S 3An end and the secondary winding N of high frequency transformer 2An end connect, the other end respectively with the 4th four-quadrant power switch S 4With output inductor L fBe connected the 4th four-quadrant power switch S 4The other end and secondary winding N 2The other end connect; This output inductor L fThe other end respectively with output filter capacitor C fWith output AC load Z LOne end connects, this output filter capacitor C f, output AC load Z LThe other end and secondary winding N 2The other end or centre tap be connected; Described output inductor L fWith output filter capacitor C fConstitute output filter, the output voltage u of the described frequency converter of this output filter filtering ABIn high order harmonic component, thereby obtain high-quality sinusoidal voltage u in the output AC load-side oThe output filter capacitor C of output filter f, output AC load Z LThe other end and secondary winding N 2Centre tap connect.
Each all four-quadrant power switchs constitutes by two single power switch differential concatenations and bears forward, reverse voltage stress and the switch of current stress in above-mentioned friendship based on forward converter-friendship type three-level AC-AC-AC converter.

Claims (6)

1, a kind of friendship-friendship type three-level AC-AC-AC converter based on forward converter, it is characterized in that: this converter is made of the input filter, multi-level converter, high frequency transformer, frequency converter, output filter and the output AC load that connect successively, this converter is transformed into sinusoidal ac with alternating current, and reduce Power Conversion progression, realize high frequency electrical isolation, be applied to the circuit structure that high pressure friendship-alternation carry over closes, promptly import filter inductance [L i] and input filter capacitor [C i] constituting input filter, this input filter is to input high-voltage ac power [u i] carry out filtering, will be converted into many level of bipolarity output voltage [u through the filtered input voltage of input filter N1] multi-level converter and the elementary winding [N of high frequency transformer [T] 1] connect the secondary winding [N of this high frequency transformer 2] be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch [S 3] and the 4th four-quadrant power switch [S 4] constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage [u AB]; In this frequency converter, the 3rd four-quadrant power switch [S 3] an end and the secondary winding [N of high frequency transformer 2] an end connect, the other end respectively with the 4th four-quadrant power switch [S 4] and output inductor [L f] be connected the 4th four-quadrant power switch [S 4] the other end and secondary winding [N 2] the other end connect; This output inductor [L f] the other end respectively with output filter capacitor [C f] and output AC load [Z L] end connection, this output filter capacitor [C f], output AC load [Z L] the other end and secondary winding [N 2] the other end or centre tap be connected; Described output inductor [L f] and output filter capacitor [C f] the formation output filter, the output voltage [u of the described frequency converter of this output filter filtering AB] in high order harmonic component, thereby obtain sinusoidal voltage [u in the output AC load-side o].
2, the friendship based on forward converter according to claim 1-friendship type three-level AC-AC-AC converter, it is characterized in that: this converter applications is promptly imported high-voltage ac power [u in the positive activation type circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes i] an end and input filter inductance [L i] end connection, this input filter inductance [L i] the other end respectively with input filter capacitor [C i], the May 4th quadrant power switch [S 5], four-quadrant clamp power switch [S c] and the elementary winding [N of high frequency transformer [T] 1] an end be connected; This input filter capacitor [C i] the other end respectively with this input high-voltage ac power [u i] the other end, feedback winding [N 3] an end, the second four-quadrant power switch [S 2] an end connect; Described input filter inductance [L i] and input filter capacitor [C i] the formation input filter; This May 4th quadrant power switch [S 5] the other end and described feedback winding [N 3] the other end connect; This four-quadrant clamp power switch [S c] the other end respectively with the second four-quadrant power switch [S 2] other end, the first four-quadrant power switch [S 1] end connection; This first four-quadrant power switch [S 1] the other end and the elementary winding [N of high frequency transformer 1] the other end connect; The described first four-quadrant power switch [S 1], the second four-quadrant power switch [S 2] and four-quadrant clamp power switch [S c] the formation multi-level converter; Output filter capacitor [the C of output filter f], output AC load [Z L] the other end respectively with secondary winding [N 2] and the 4th four-quadrant power switch [S of frequency converter 4] the other end connect.
3, the friendship based on forward converter according to claim 1-friendship type three-level AC-AC-AC converter, it is characterized in that: this converter applications is promptly imported high-voltage ac power [u in the push-pull circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes i] an end and input filter inductance [L i] end connection, this input filter inductance [L i] the other end respectively with input filter capacitor [C i], the first four-quadrant clamp power switch [S C1] and the second four-quadrant clamp power switch [S C2] an end and the elementary winding [N of high frequency transformer [T] 1] centre tap be connected; This input filter capacitor [C i] the other end respectively with input high-voltage ac power [u i] the other end, the second four-quadrant power switch [S 2], the 6th four-quadrant power switch [S 6] connect described input filter inductance [L i] and input filter capacitor [C i] the formation input filter; This second four-quadrant power switch [S 2] the other end respectively with the first four-quadrant power switch [S 1] end and the first four-quadrant clamp power switch [S C1] other end is connected this first four-quadrant power switch [S 1] the other end and elementary winding [N 1] an end connect; Described the 6th four-quadrant power switch [S 6] the other end respectively with the 7th four-quadrant power switch [S 7] end and the second four-quadrant clamp power switch [S C2] other end connection; The 7th four-quadrant power switch [S 7] other end and elementary winding [N 1] the other end be connected; The described first four-quadrant power switch [S 1], the second four-quadrant power switch [S 2], the first four-quadrant clamp power switch [S C1], the 6th four-quadrant power switch [S 6], the 7th four-quadrant power switch [S 7] and the second four-quadrant clamp power switch [S C2] constitute multi-level converter, the wherein first four-quadrant power switch [S jointly 1], the second four-quadrant power switch [S 2] and the first four-quadrant clamp power switch [S C1] constitute the first basic comprising unit of this multi-level converter, the 6th four-quadrant power switch [S 6], the 7th four-quadrant power switch [S 7] and the second four-quadrant clamp power switch [S C2] constitute the second basic comprising unit of this multi-level converter; Output filter capacitor [the C of output filter f], output AC load [Z L] the other end and secondary winding [N 2] centre tap connect.
4, the friendship based on forward converter according to claim 1-friendship type three-level AC-AC-AC converter, it is characterized in that: this converter applications is promptly imported high-voltage ac power [u in the half bridge circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes i] an end and input filter inductance [L i] end connection, this input filter inductance [L i] the other end respectively with the first input filter capacitor [C 1] and the second four-quadrant power switch [S 2] an end be connected; This first input filter capacitor [C 1] the other end respectively with the second input filter capacitor [C 2], the 3rd four-quadrant clamp power switch [S C3], the 4th four-quadrant clamp power switch [S C4], the elementary winding [N of high frequency transformer [T] 1] an end connect; Described input filter inductance [L i], the first input filter capacitor [C 1] and the second input filter capacitor [C 2] constitute input filter, to input high-voltage ac power [u i] filtering, and the first input filter capacitor [C 1] and the second input filter capacitor [C 2] to input high-voltage ac power [u i] carry out dividing potential drop; This second input filter capacitor [C 2] the other end respectively with input high-voltage ac power [u i] other end and the 8th four-quadrant power switch [S 8] end connection; The described second four-quadrant power switch [S 2] the other end respectively with the 3rd four-quadrant clamp power switch [S C3] other end and the first four-quadrant power switch [S 1] end is connected; This first four-quadrant power switch [S 1] the other end respectively with elementary winding [N 1] other end and the 9th four-quadrant power switch [S 9] end connection, the 9th four-quadrant power switch [S 9] the other end respectively with the 4th four-quadrant clamp power switch [S C4] the other end, the 8th four-quadrant power switch [S 8] the other end connect; The described first four-quadrant power switch [S 1], the second four-quadrant power switch [S 2], the 3rd four-quadrant clamp power switch [S C3], the 8th four-quadrant power switch [S 8], the 9th four-quadrant power switch [S 9] and the 4th four-quadrant clamp power switch [S C4] constitute multi-level converter, the wherein first four-quadrant power switch [S jointly 1], the second four-quadrant power switch [S 2] and the 3rd four-quadrant clamp power switch [S C3] constitute the first basic comprising unit of this multi-level converter, the 9th four-quadrant power switch [S 9], the 8th four-quadrant power switch [S 8] and the 4th four-quadrant clamp power switch [S C4] constitute the second basic comprising unit of this multi-level converter; Output filter capacitor [the C of output filter f], output AC load [Z L] the other end and secondary winding [N 2] centre tap connect.
5, the friendship based on forward converter according to claim 1-friendship type three-level AC-AC-AC converter, it is characterized in that: this converter applications is promptly imported high-voltage ac power [u in the full bridge circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes i] an end and input filter inductance [L i] end connection, this input filter inductance [L i] the other end respectively with the first input filter capacitor [C 1], the second four-quadrant power switch [S 2] and the 13 four-quadrant power switch [S 13] an end be connected; This first input filter capacitor [C 1] the other end respectively with the second input filter capacitor [C 2], the May 4th quadrant clamp power switch [S C5], the 6th four-quadrant clamp power switch [S C6], the 7th four-quadrant clamp power switch [S C7] and the 8th four-quadrant clamp power switch [S C8] an end connect; Described input filter inductance [L i], the first input filter capacitor [C 1] and the second input filter capacitor [C 2] constitute input filter, to input high-voltage ac power [u i] filtering, and the first input filter capacitor [C 1] and the second input filter capacitor [C 2] to input high-voltage ac power [u i] carry out dividing potential drop; This second input filter capacitor [C 2] the other end respectively with input high-voltage ac power [u i] the other end, the tenth four-quadrant power switch [S 10] end and the 14 four-quadrant power switch [S 14] end connection; The described second four-quadrant power switch [S 2] the other end respectively with the May 4th quadrant clamp power switch [S C5] the other end and the first four-quadrant power switch [S 1] end is connected this first four-quadrant power switch [S 1] the other end respectively with the elementary winding [N of high frequency transformer [T] 1] an end and the 11 four-quadrant power switch [S 11] end connection, the 11 four-quadrant power switch [S 11] the other end respectively with the 6th four-quadrant clamp power switch [S C6] the other end, the tenth four-quadrant power switch [S 10] the other end connect; Described the 13 four-quadrant power switch [S 13] the other end respectively with the 7th four-quadrant clamp power switch [S C7] the other end and the 12 four-quadrant power switch [S 12] end connection, the 12 four-quadrant power switch [S 12] the other end respectively with elementary winding [N 1] the other end and the tenth the May 4th quadrant power switch [S 15] end connection, the tenth the May 4th quadrant power switch [S 15] the other end respectively with the 8th four-quadrant clamp power switch [S C8] the other end, the 14 four-quadrant power switch [S 14] the other end be connected; The described first four-quadrant power switch [S 1], the second four-quadrant power switch [S 2], the May 4th quadrant clamp power switch [S C5], the tenth four-quadrant power switch [S 10], the 11 four-quadrant power switch [S 11], the 6th four-quadrant clamp power switch [S C6], the 12 four-quadrant power switch [S 12], the 13 four-quadrant power switch [S 13], the 7th four-quadrant clamp power switch [S C7], the 14 four-quadrant power switch [S 14], the tenth the May 4th quadrant power switch [S 15] and the 8th four-quadrant clamp power switch [S C8] constitute multi-level converter, the wherein first four-quadrant power switch [S jointly 1], the second four-quadrant power switch [S 2] and the May 4th quadrant clamp power switch [S C5] constitute the first basic comprising unit of this multi-level converter; The tenth four-quadrant power switch [S 10], the 11 four-quadrant power switch [S 11] and the 6th four-quadrant clamp power switch [S C6] constitute the second basic comprising unit of this multi-level converter; The 12 four-quadrant power switch [S 12], the 13 four-quadrant power switch [S 13] and the 7th four-quadrant clamp power switch [S C7] constitute the 3rd basic comprising unit of this multi-level converter; The 14 four-quadrant power switch [S 14], the tenth the May 4th quadrant power switch [S 15] and the 8th four-quadrant clamp power switch [S C8] constitute the 4th basic comprising unit of this multi-level converter; Output filter capacitor [the C of output filter f], output AC load [Z L] the other end and secondary winding [N 2] centre tap connect.
6, according to each described friendship based on forward converter of claim 1 to 5-friendship type three-level AC-AC-AC converter, it is characterized in that: each four-quadrant power switch constitutes by two single power switch differential concatenations and bears forward, reverse voltage stress and the switch of current stress.
CNB2007100209464A 2007-04-04 2007-04-04 AC-AC three level AC-AC converter based on positive converter Expired - Fee Related CN100499343C (en)

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