CN100405723C - PWM combined three level DC converter of Zero voltage switch - Google Patents

PWM combined three level DC converter of Zero voltage switch Download PDF

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CN100405723C
CN100405723C CN 200610098274 CN200610098274A CN100405723C CN 100405723 C CN100405723 C CN 100405723C CN 200610098274 CN200610098274 CN 200610098274 CN 200610098274 A CN200610098274 A CN 200610098274A CN 100405723 C CN100405723 C CN 100405723C
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series
switch
connected
circuit
switching transistor
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CN 200610098274
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CN1988346A (en
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刘福鑫
阮新波
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南京航空航天大学
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion
    • Y02B70/14Reduction of losses in power supplies
    • Y02B70/1491Other technologies for reduction of losses, e.g. non-dissipative snubbers, diode reverse recovery losses minimisation, zero voltage switching [ZVS], zero current switching [ZCS] or soft switching converters

Abstract

一种零电压开关PWM组合型三电平直流变换器,属于直流变换器。 A zero-voltage switching PWM Combined three level converter, belonging to DC converter. 该直流变换器由输入分压电容电路(1)、半桥三电平变换器(2)、全桥变换器(3)、隔离变压器(4)、整流及滤波电路(5)组成,其特点是由半桥三电平变换器和全桥变换器组合而成,开关管的电压应力为输入电压的一半;输出整流电压波形中高频分量小,减小了输出滤波电感;实现了开关管的零电压开关,并降低了副边整流管的电压应力。 The DC converter the input voltage dividing capacitor circuit (1), three-level half-bridge inverter (2), full-bridge converter (3), an isolating transformer (4), rectifier and filter circuit (5), characterized is a combination of three-level half-bridge converters and full-bridge converter made, switch voltage stress is half the input voltage; a small output voltage waveform of the rectified high frequency component, the reduced output filter inductor; to achieve a switch tube zero voltage switching, and reduces the voltage stress of the secondary side of the rectifier. 其特点还在于在原半桥三电平变换器和全桥变换器中分别引入变压器超前型和变压器滞后型箝位电路。 It is further characterized by introducing lead type transformers and transformer primary clamp circuit hysteresis type three-level half-bridge converters and full-bridge converter. 保留了原变换器的优点外,利用谐振电感扩大了开关管实现零电压开关的负载范围,利用箝位二极管消除了副边整流管上的电压尖峰和振荡,进一步降低了整流管的电压应力。 Retaining the advantages of the original transducer, the resonant inductor expanded using switch load range to achieve zero-voltage switching, the use of clamp diode eliminates voltage spikes and ringing on the secondary rectifier, to further reduce the voltage stress rectifier.

Description

零电压开关P謂组合型三电平直流变换器一、 技术领域本发明的零电压开关PWM组合型三电平直流变换器与其改进型变换器,属电能变换装置的直流变换器。 That zero-voltage switching P-type compositions a three-level converter, the technical field of the invention composition ZVS PWM three-level inverter DC converter and its modification, the inverter is a DC power conversion apparatus. 二、 背景技术近年来随着对电力电子技术的深入研究,人们对使用市电的功率变换装置的用电质量提出了越来越严格的要求。 Second, recent years with further research on power electronics technology, the quality of people's electricity power converter of mains-powered proposed more stringent requirements. 国际电工委员会己经制定了标准IEC61000-3-2,对谐波含量进行限制。 International Electrotechnical Commission has developed a standard IEC61000-3-2, for harmonic content restrictions. 这样电气装置就有必要采用功率因数校正技术。 Thus it is necessary to use an electrical device power factor correction technology. 中、大功率的高频开关电源一般为三相380VAC士20M输入,整流后的直流母线电压最高将会达到640V左右;如果采用三相功率因数技术,直流母线电压通常会达到760-800V,甚至会高达上千伏,这就使得后级直流变换器中开关管的电压应力大大增加,给器件的选取带来了困难。 , The high-power frequency switching power supply is generally a three-phase 380VAC input disabilities 20M, the maximum rectified DC bus voltage will reach 640V; if three-phase power factor technology, the DC link voltage usually reaches 760-800V, even It is as high kilovolt, which makes the DC voltage stress of the converter switch stage greatly increased, to select the device makes it difficult. 三电平变换器是通过增加开关管的数量来降低变换器中开关管的电压应力,使之适用于输入电压高的场合。 Three level converter is a converter to reduce the voltage stress in the switch by increasing the number of the switch to make it suitable for high input voltages. 半桥三电平变换器是最早提出的隔离型三电平变换器之一,它具有电路结构简单,可以实现软开关,开关频率恒定等优点,因而得到广泛应用。 Half-bridge three-level converter is one isolated three-level converter first proposed, it has a simple circuit configuration can achieve soft switching, constant switching frequency, etc., which are widely used. 但在输入电压高而且范围很宽的场合,如船舶配电系统中的直流电源和电力机车中的直流电源,其输入电压高达上千伏,且通常是两倍的电压变化范围,如果在这些场合下采用半桥三电平变换器,其缺点是输出滤波电感体积大,变换器的功率密度低,动态响应慢, 而且无法在整个输入电压范围内保持高效率。 However, at high input voltage and a wide range of applications, such as marine power distribution systems and electric locomotives in the DC power supply DC power, up to the input voltage kV, and usually is twice the voltage range, if the case of using the half-bridge three-level converter, the drawback is the large volume of the output filter inductance, low power density converters, slow dynamic response, and can not maintain high efficiency over the entire input voltage range. 此外,半桥三电平变换器只是实现了主功率管的软开关,但其副边整流管依然存在反向恢复问题,反向恢复引起电压振荡,副边整流管要承受电压尖峰,很容易损坏,必须采取合适的方法来消除。 In addition, the half-bridge three-level converter is to achieve soft-switching of the main power transistor, but the secondary side rectifier reverse recovery problems still exist, due to the reverse recovery voltage oscillation, the secondary side rectifier to withstand voltage spikes, easily damaged, it must take appropriate way to eliminate. 三、 发明内容本发明的目的是针对高压输入场合,研制一种零电压开关PWM组合型三电平直流变换器,使所有开关管的电压应力均为输入电压的一半,并且能减小副边整流电压的高频分量,减小输出滤波器的体积;同时研制其改进型变换器,以有效地消除副边整流电压尖峰,减小副边整流管上的损耗,提高变换效率。 III SUMMARY OF INVENTION An object of the present invention is directed to high voltage input case, to develop a combination of zero voltage switching PWM three-level DC converter, the voltage stress of the switch are all half of the input voltage and the secondary side can be reduced high-frequency component of the rectified voltage, reducing the volume of the output of the filter; while developed which improved converter to effectively eliminate the secondary rectified voltage spikes, reducing the loss in the secondary rectifier, to improve the conversion efficiency. 本发明的零电压开关PWM组合型三电平直流变换器由半桥三电平变换器和全桥变换器组合而成,半桥三电平变换器的输入直流母线两端连于输入分压电容电路的输出,全桥变换器的两个桥臂跨接于飞跨电容两端,两个变换器公用半桥三电平变换器中三电平逆变桥臂中间的两只开关管和飞跨电容,公用的两只开关管组成的桥臂称之为滞后桥臂。 Zero-voltage switching PWM composition of the invention is a combination of three level converter of three-level half-bridge converter and a full bridge converter made, both ends of the input DC bus half-bridge three-level inverter connected to the voltage input points output capacitance circuit, two full-bridge converter bridge arms connected across the two ends of the flying capacitor, the two intermediate half-bridge three-level inverter common converter three-level inverter bridge arm switch tube and two flying capacitor, two switching arm common tubes called lagging leg. 两个变换器的隔离变压器原边绕组的同名端均连于三电平逆变桥臂的中点,其异名端分别连于两只输入分压电容的中点和全桥变换器另外一只桥臂的中点。 Two isolation transformer dot end of the primary winding of the transformer are connected to the midpoint of the three-level inverter bridge arm, which are connected to the dotted end of the full-bridge inverter and the midpoint of two further inputs a dividing capacitor only the midpoint of the bridge arm. 两个隔离变压器的副边绕组按同名端一致的方向互相串联,并连于整流及滤波电路。 Two secondary windings of the isolation transformer dot end in a consistent direction in series to each other, and connected to the rectifier and filter circuit. 具体电路包括由直流电源及两个分压电容串联后并联在直流电源正负两端所组成的输入分压电容电路、隔离变压器、整流及滤波电路,其中螯流及滤波电路的组成是, 四个整流二极管两两串联组成两路整流电路.该两瞎整壤电路并联后的正负糖出纗并接输出滤波电感与输出滤波电容的串联电路构成回路。 DETAILED dividing circuit comprises an input capacitor circuit in parallel with the DC power supply and the two voltage dividing capacitors connected in series at both ends of the positive and negative DC power source composed of an isolation transformer, rectifier and filter circuit, and wherein the composition is a chelating flow filter circuit, four two rectifier diodes connected in series two two-way rectifier circuit. Zui negative after the sugar out of the entire marina two blind parallel circuit connected to the output filter inductor and the output filter capacitor and a series circuit loop. 第一路整流电路两个整流二极管的串联点连于第一隔离变压器副边绕组的同名端,第二路整流电路两个二极管的串联点连于第二隔离变压器副边绕组的异名端,第一隔离变压器鹏边绕组异名端连于第二隔离变压器副边绕组同名端,其特征在于,还包括半桥三电平变换器和全桥变换器。 A first series connection point of two rectifier diodes passage rectifying circuit connected to the dotted end of secondary winding of the first isolating transformer, two diodes in series connected rectifying circuit node of the second path to the dotted end of the secondary winding of the second isolating transformer, Peng first isolation transformer winding connected to the dotted end of the secondary winding of the second isolation transformer dot end, characterized by further comprising a three-level half-bridge converter and a full bridge converter. 所述半桥三电平变换器的组成是,将第一开关管、第二开关管、第三开关管和第四开关管依次串联后并接在输入分压电容电路正负输出壤,两个续流二极管正向串联的串联电路与飞跨电容均同时并联在第一开关管与第二开关管的串联点和第三开关管与第四开关管的串联点之间,其中两个续流二极管的串联点与两个分压电審的串联点相连接,第一隔离变压器原边绕组的同名端连于第二开关管与第三开关管的串联点,异名端连接第一隔离变压器原边寄生漏感后;连于两个续流二极管的串联点,第一开关管、第二开关管、第三开关管和第四开关管各自并联寄生体二极管和寄生电容,所述全桥变换器的组成是将第五开关管与第六开关管串联后并联在半桥三电平变换器的第一开关管与第二开关管的串联点和第三开关管与第四开关管的串联点之间,第二隔离变 The composition of the half-bridge three-level converter is, after the first switch, a second switch, a third switch and a fourth switch connected in series and dividing the input capacitance circuit negative output soil, two freewheeling diode forward series circuit connected in series across the flying capacitors are connected in parallel between the series while a series point and the second point of the first switch and the third switch and the fourth switch switch tube, wherein two continued point of the series diode in series with the two voltage dividing point is connected to the trial, a first isolation transformer dot end of the primary winding serially connected to the switch point of the second tube and the third switch, a first terminal connected synonym isolation after the parasitic leakage inductance of the transformer primary; attached to two points freewheeling diode connected in series, the first switch, second switch, third switch and fourth switch are each parallel parasitic body diode and parasitic capacitance, the full composition bridge converter is connected in parallel to the series node of the first switch half-bridge three-level inverter of the second switch and the third switch and a fourth switch connected in series after the fifth switch and the sixth switch tube series between the points, a second isolation transformer 器原边绕组的异名端连接第二隔离变压器原边寄生漏感后连于第五开关管与第六开关管的串联点,其同名端接在半桥三电平变换器的第二开关管与第三开关管的串联点并与第一隔离变压器的同名端相连,第五、第六两个开关管包括其寄生体二极管和寄生电容。 The second switch-dotted end of the primary winding is connected to a second side of the isolation transformer primary parasitic leakage inductance connected in series with the fifth point and the sixth switch transistor switch tube, terminating its namesake three-level converter in half-bridge point of the third switch in series with the tube and the tube is connected to the dotted end of the isolation transformer of the first, fifth, sixth two switching transistor including a parasitic capacitance and a parasitic body diode. 本发明的改进型变换器是将由谐振电感、隔离变压蕃和箝位二极管组成的箝位网络引入到零电压开关PWM组合型三电平直淹变換器中,具体为:(1) 在半桥三电平变换器中将谐振电感与隔离变压器串联,谐振电感的一端连于第一隔离变压器原边绕组的同名端,另一端连于半桥三电平变换器的第二开关管与第三开关管的串联点,且在第一隔离变压器的原边绕组与谐振电感交点处连接两个互相串联的箝位二极管,构成箝位网络,由于变压器的位置在谐振电感之前,因此称之为变压器超前型箝位网络,相应地称改进后的变换器为变压器超前型零电压开关PWM组合型三电平直流变换器。 Improved converter of the present invention is by resonant inductor, Fan isolation transformer and the clamp diode clamping network is introduced into the zero-voltage switching PWM Combined Three straight flooded converter, specifically: (1) the second switch half-bridge three-level converter in the isolation transformer in series with the resonant inductor, resonant inductor is connected to one end of a first primary winding of the isolation transformer dot end, and the other end connected to the half-bridge three-level converter and the third point of the series switch, and connecting the two mutually series-connected clamping diodes in the resonant inductor and the primary winding of the isolation transformer at the intersection of the first, clamping network configuration, since the position before the resonant inductor of the transformer, so termed clamp advance network transformer, said correspondingly improved lead type converter transformer zero voltage switching PWM Combined three-level converter. 两个箝位二极管分别连接于变换器直流输入的正母线与负母线,其极性为一个二极管Del的阴极接正母线,另一个二极管Dc2的阳极接负母线。 Two clamp diodes respectively connected to the positive bus and the negative DC bus converter input, which is a polarity Del diode cathode connected to the positive bus, the anode of the other diode Dc2 to the negative bus. (2) 在全桥变换器中将谐振电感与隔离变压器串联,谐振电感的一端连于半桥三电平变换器的第二开关管与第三开关管的串联点,另一端连于第二隔离变压器的同名端, 同样在直流输入正负母线之间连接两个相互串联的箝位二极管,由于此时变压器的位置在谐振电感之后,因此称之为变压器滞后型雜位网络,相应地称改进后的变换器为变压器滞后型零电压开关PWM组合型三电平直流变换器。 (2) in the full-bridge converter with a resonant inductor in series isolation transformer, one end of the resonant inductor connected in series to the third point of the second switch and the switch half-bridge three-level converter, the other end of the second isolation transformer dot end, two mutually similar input is connected in series between the positive and negative DC bus clamping diodes, since at this time after the position of the resonant inductor of the transformer, the transformer so called Delay heteroaryl-bit network, said correspondingly improved hysteresis type converter transformer zero voltage switching PWM Combined three-level converter. 本发明与现有技术相比的主要特点是,所有开关管的电压应力均为输入电压的一半,适用于髙压直流输入场合;通过将两种变換器的副边电压进行叠加,降低了,aif流电压中高频分量的幅值,进而大幅度减小输出滤波器的体积;利用输出滤波电感和隔离变压器漏感(或外加谐振电感)与开关管结电容可以实现开关管的零电压开关,从而降低开关管开关损耗,提高变换效率;引入箝位网络,扩大了开关管实现零电压开关的负载范围,消除因副边整流管的反向恢复而引起的电压振荡和电压尖峰,从而降低副边整流管的电压应力,并且减小了副边整流管因反向恢复引起的损耗,提高了变换效率。 The main features of the present invention compared to prior art, all switch voltage stress are half of the input voltage, the DC input voltage applied to Gao occasions; by superimposing two kinds of the secondary voltage of the converter, reducing , AIF voltage amplitude of high-frequency components flow, thereby drastically reducing the volume of the output filter; the use of the output filter inductor and the isolation transformer leakage inductance (or external resonant inductor) and the switching junction capacitance can achieve zero-voltage switching of the switching tube , thereby reducing the switch switching losses, improve the conversion efficiency; clamping network is introduced, expanding the range of the load switch achieve zero voltage switching, eliminating the oscillating voltage and voltage spikes due to the secondary side rectifier reverse recovery due to reduced secondary rectifier voltage stress, and reduces the secondary rectifier losses caused by reverse recovery, improve the conversion efficiency. 四、 附图说明附图1是本发明的零电压开关P觀组合型三电平直流变换器电路结构示意图附图2是零电压开关PWM组合型三电平直流变换器在三电平工作模式的主要波形示意图。 Fourth, the accompanying drawings is a zero voltage switching concept of the present invention is a combination of P-type three-level converter circuit configuration of Figure 2 is a schematic three-level zero voltage switching operation mode three-level PWM composition DC converter main waveform diagram. 附图3是零电压开关P觀组合型三电平直流变换器在两电平工作模式的主要波形示意图。 3 is a waveform diagram main three-level converter in two-level operation mode zero voltage switching P Combined View. 附图4-16是各开关模态的等效电路结构示意图。 Figures 4-16 are schematic equivalent circuit configuration of each mode switch. 附图17是变压器超前型零电压开关PWM组合型三电平直流变换器电路结构示意图。 Figure 17 is a zero-voltage switching PWM composition schematic three-level DC type converter transformer lead circuit configuration. 附图18是变压器滞后型零电压开关PWM组合型三电平直流变换器电路结构示意图。 Figure 18 is a combination of zero-voltage switching PWM three-level schematic diagram of a DC type converter transformer hysteresis circuit configuration. 附图19是变压器超前型零电压开关P丽组合型三电平直流变换器在三电平工作模式的主要波形示意图。 Figure 19 is a waveform diagram of the transformer primary leading zero voltage switching P-type three-level composition Li DC converter in the three-level mode of operation. 附图20是变压器超前型零电压开关P丽组合型三电平直流变换器在两电平工作模式的主要波形示意图。 Figure 20 is a waveform diagram of the transformer primary leading zero voltage switching P-type three-level composition Li DC converter in two-level operation mode. 附图21-24是各开关模态的等效电路结构示意图。 21-24 is an equivalent schematic circuit configuration of each modal switch. 上述附图中的主要符号名称:Vin、输入直流电压。 The main symbolic name of the above-described drawings: Vin, the input DC voltage. Cdl、 Cd2、输入分压电容。 Cdl, Cd2, the input dividing capacitor. Ql〜 Q6、开关管。 Ql~ Q6, the switch. C1〜C6、开关管寄生电容。 C1~C6, the parasitic capacitance of the switch. D1〜D6、开关管体二极管。 D1~D6, the switch body diode. Dfl、 Df2、续流二极管。 Dfl, Df2, a freewheeling diode. Css、飞跨电容。 Css, flying capacitor. Trl、 Tr2、隔离变压器。 Trl, Tr2, isolation transformer. Llkl、 Llk2、隔离变压器原边寄生漏感。 Llkl, Llk2, isolation transformer primary parasitic leakage inductance. Lr、谐振电感。 Lr, resonant inductor. Dcl、 Dc2、箝位二极管。 Dcl, Dc2, clamp diode. DR1、 DR2、 DR3、 DR4、副边整流二极管。 DR1, DR2, DR3, DR4, secondary rectifier diode. Lf、输出滤波电感。 Lf, the output filter inductor. Cf、输出滤波电容。 Cf, an output filter capacitor. RLd、负载。 RLd, load. vbridge、变压器副边电压之和。 vbridge, and the secondary voltage of the transformer. vrect、副边整流电压。 vrect, secondary rectified voltage. Vo、输出电压。 Vo, the output voltage. vAB、 A与B两点间电压。 vAB, the voltage between points A and B. vAC、 A与C两点间电压。 vAC, the voltage between points A and C. 五、 具体实施方式附图l, 17和18分别叙述本发明的电路组成结构。 V. DETAILED DESCRIPTION figures l, 17 and 18 described circuit structure of the present invention. 下面将分别加以介绍-(1)零电压开关P觀组合型三电平直流变换器附图1为零电压开关PWM组合型三电平直流变换器结构示意图,由输入分压电容电路1 、半桥三电平变换器2 、全桥变换器3 、隔离变压器4'、整流及滤波电路5 组成。 Will be introduced respectively - (1) a combination of three-level zero-voltage switching DC converter BRIEF Concept 1 P zero voltage switching PWM DC compositions schematic structure of a three-level converter, the input capacitance dividing circuit 1, a half 2 three-level converter bridge, full-bridge inverter 3, an isolation transformer 4 ', 5 composed of the rectifier and filter circuit. 其中分压电容Cdl和Cd2容量很大且相等,其电压均为输入电压Vin的一半,即Vcdl=Vcd2=Vin/2,可看作电压为Vin/2的电压源。 Wherein the dividing capacitor and large capacity Cdl and Cd2 are equal, which are half of the input voltage Vin of the voltage, i.e. Vcdl = Vcd2 = Vin / 2, can be seen as a voltage source for the voltage Vin / 2 in. 半桥三电平变换器由开关管Q1-Q4及其体二极管Dl-D4和寄生电容C卜C4、续流二极管Dfl和Df2、飞跨电容Css和隔离变压器Trl组成,开关管Q1、 Q4与开关管Q2、 Q3采用移相控制,开关管Ql和Q4为超前管,开关管Q2和Q3为滞后管;全桥变换器由开关管Q2、 Q3、 Q5和Q6、飞跨电容Css 和隔离变压器Tr2组成,这四只开关管也采用移相控制,其中开关管Q5和Q6为超前管, 开关管Q2和Q3为滞后管。 A half-bridge three-level inverter switch Q1-Q4 and the body diode Dl-D4 and parasitic capacitance C Bu C4, and freewheeling diode Df2 of Dfl, flying capacitor Css and isolation transformer Trl composition, the switch Q1, Q4 and switch Q2, Q3 using phase shift control, the switch Ql and Q4 are leading pipe, the switch Q2 and Q3 of the lagging; full bridge converter by the switching transistor Q2, Q3, Q5 and Q6 are, flying capacitor Css and isolation transformer Tr2 composition, which switch also uses four phase shift control, wherein the switch Q5 and Q6 is leading pipe, the switch Q2 and Q3 are lagging. 两个变压器的副边串联在一起,采用全桥整流方式,DR1-DR4 是副边整流二极管,Lf是输出滤波电感,Cf是输出滤波电容,RLd是负载。 Two transformer secondary side series with the full bridge rectifier, DR1-DR4 is a secondary rectifier diode, an output filter inductor Lf of, of Cf is the output filter capacitor, the load RLd. 当输入电压较低时,开关管Q1、 Q4与开关管Q2、 Q3之间有一个较小的固定相位差5,目的是将这两对开关管的开关过程解耦开来。 When the input voltage is low, there is a phase difference smaller fixed tube 5 between the switch Q1, Q4 and switching transistor Q2, Q3, the aim of these two switching processes decoupling switch off. 但由于S很小,半桥三电平变换器近似满占空比工作,开关管Q2、 Q3与开关管Q5、 Q6移相工作,通过调节它们之间的移相角来调节输出电压,此时电压vAC为一脉宽调制的波形。 However, since the S is very small, approximately a half-bridge three-level converter full duty cycle, switching transistor Q2, Q3 and the switch Q5, Q6 work phase shift by adjusting the phase angle shift therebetween to regulate the output voltage, this vAC voltage is a pulse width modulated waveform. 将两个变压器的副边电压串联叠加后得到一个五电平的电压vbridge,整流后的电压vrect与输出电压非常接近,高频交流分量幅值很小。 To give a five-level after the secondary voltage of the transformer in series two superimposed voltage vbridge, vrect voltage rectified output voltage very close to the high-frequency AC component of small amplitude. 电压vrect存在三个电平:1电平((kl+k2)Vin/2),中间电平(klVin/2)和0电平(由两个漏感引起的占空比丢失造成),其中kl与k2分别为变压器Trl和Tr2的副原边变比,此时称该变换器工作在三电平模式。 There are three level voltage vrect: 1 level ((kl + k2) Vin / 2), intermediate level (klVin / 2) and the zero level (the duty ratio of the two loss caused by the leakage inductance), wherein kl and k2 are sub primary transformer Trl and Tr2 side ratio, when the converter operates in said three-level mode. 随着输入电压的上升,全桥变换器的移相角逐渐变大,脉宽随之变窄。 As the input voltage rises, the phase-shift full-bridge converter compete large gradient pulse width became narrow. 当输入电压上升到某一值,或变换器处于起动,超载或短路状态时,该移相角达到最大值180° , 全桥变换器的脉宽为零,不提供输出电压。 When the input voltage rises to a certain value, the converter is started or when overloaded or short-circuited state, the maximum phase shift angle reaches 180 °, the pulse width of the full bridge converter is zero, it does not provide an output voltage. 此时半桥三电平变换器开始进行移相控制, 通过调节开关管Q1、 Q4与开关管Q2、 Q3之间的移相角来调节输出电压。 At this time, the half-bridge three-level inverter phase shift control is started, by adjusting the switching transistor Q1, Q4 and switching transistor Q2, Q3 phase angle shift between the output voltage is regulated. 在这种工作模式下,电压vrect为一两电平的电压波形(中间电平和O电平),此时称变换器工作在两电平模式。 In this operating mode, the voltage vrect is a two-level voltage waveform (O intermediate level and level), when said converter is operated in two-level mode. 超前管Ql、 Q4、 Q5、 Q6通过输出滤波电感可以在宽负载范围内实现零电压开关, 滞后管Q2和Q3则通过漏感或外加谐振电感的能量在一定负载范围内实现零电压开关, 从而减小开关管的开关损耗,提高变换效率。 Advance pipe Ql, Q4, Q5, Q6 may be achieved through the output filter inductor in a wide load range of zero voltage switching, hysteresis transistor Q2 and Q3 of the energy leakage inductance or additional resonant inductor to achieve zero voltage switching within a certain load range through to reducing the switching loss of the switch, improve the conversion efficiency. 下面结合附图2-16叙述零电压开关P丽组合型三电平直流变换器的具体工作原理。 The following describes operational principles of composition Li P ZVS three-level DC converter in conjunction with the accompanying drawings 2-16. 由附图2可知该变换器在三电平模式中一个开关周期有16种开关模态,分别是[t0以前]、[t0, tl]、 [tl, t2]、 [t2, t3]、 [t3, t4]、 [t4, t5]、 [t5, t6] 、 [t6, t7]、 [t7, t8]、 [t8, t9]、 [t9, t10]、 [t10, tll]、 [tll, t12]、 [tl2, t13]、 [tl3, t14]、 [tl4, t15],其中,[t0以前,t7]为前半周期,[t7, tl5]为后半周期。 Understood by reference switching cycle of the converter 2 has 16 switches the mode three-level mode, respectively [t0 before], [t0, tl], [tl, t2], [t2, t3], [ t3, t4], [t4, t5], [t5, t6], [t6, t7], [t7, t8], [t8, t9], [t9, t10], [t10, tll], [tll, t12], [tl2, t13], [tl3, t14], [tl4, t15], where, [t0 before, t7] for the first half cycle, [t7, tl5] is a half of the cycle. 下面对各开关模态的工作情况进行具体分析。 The following detailed analysis of the operation of the switches modes. 在分析之前,作如下假设:①所有开关管和二极管均为理想器件;②所有电感、电容和隔离变压器均为理想组件;③飞跨电容Css足够大,稳态时其电压为Vin/2。1.开关模态1 [t0以前][对应于附图4]tO以前,开关管Q1、 Q2和Q6导通,原边电流ipl流经电源正、开关管Q1、开关管Q2、变压器Trl原边绕组,最后回到电源负。 Prior to analysis, the following assumptions: ① all switches and diodes are over the device; ② all inductors, capacitors and transformers are isolation over the assembly; ③ flying capacitor Css is large enough, its steady state voltage Vin / 2. 1. switching mode 1 [t0 before] [corresponding to the reference 4] tO before, the switch Q1, Q2 and Q6 are turned on, the primary current flowing through the power ipl positive, the switch Q1, the switch Q2, the transformer Trl original winding, and finally back to a negative power supply. 在另一个回路中,原边电流ip2流经电源正、开关管Q1、开关管Q2、变压器Tr2原边绕组、开关管Q6与续流二极管Df2,最后回到电源负。 In another circuit, primary current ip2 power flowing through the positive, the switch Q1, the switch Q2, primary winding of transformer Tr2, a switching transistor Q6 and the freewheeling diode Df2 of, and finally back to the negative power supply. 副边整流管DR1、 DR4导通,原边向副边提供能量。 Secondary rectifier DR1, DR4 turned on, to provide the primary energy to the secondary side. 2. 开关模态2 [t0-tl][对应于附图5]tO时刻关断开关管Q6,原边电流ip2从开关管Q6转移至电容C5和C6支路中,给电容C6充电,给电容C5放电。 2. Switch Mode 2 [t0-tl] [corresponding to figures 5] tO time switch Q6 is turned off, the primary current ip2 is transferred from the switch transistor Q6 to the capacitor C5 and C6 branch, to charge the capacitor C6, to capacitor C5 discharges. 在电容C5和C6的缓冲作用下,开关管Q6近似为零电压关断,电压vAB保持Vin/2不变,电压vAC下降。 In the buffer capacitors C5 and C6, nearly zero voltage switch transistor Q6 is turned off, the voltage holding vAB Vin / 2 constant, the voltage drop vAC. 到tl时刻,电容C6的电压升至Vin/2, 电容C5的电压降至零,二极管D5自然导通。 To time tl, the voltage of the capacitor C6 is raised Vin / 2, the voltage of the capacitor C5 drops to zero, the diode D5 natural conduction. 3. 开关模态3 [tl-12][对应于附图6]二极管D5导通后,将开关管Q5两端的电压箝在零位,此时可以零电压开通开关管Q5。 3. Switch Mode 3 [tl-12] [corresponding to Figure 6] diode D5 is turned on after the switch Q5 across the voltage clamp at zero, this time can be zero-voltage switching transistor Q5. 在这段时间里,电压vAB:Vin/2,电压vAC:O。 During this time, the voltage vAB: Vin / 2, the voltage vAC: O. 4. 开关模态4 [t2-13][对应于附图7]t2时刻,开关管Ql关断,原边电流ipl给电容Cl充电,同时通过电容Css给电容C4放电,电压vAB下降,电压vAC维持零状态不变。 4. Switch Mode 4 [t2-13] [corresponding to figures 7] t2 in time, the switch Ql is turned off, the primary current ipl charge the capacitor Cl, while the capacitor C4 discharges through capacitor Css, the voltage drop vAB voltage vAC maintain a zero state unchanged. 由于有电容C1和C4,开关管Ql 是零电压关断。 Because capacitors C1 and C4, zero-voltage switching transistor Ql is turned off. 到t3时刻,电容C1电压线性上升到Vin/2,电容C4电压下降到零,此时可以零电压开通开关管Q4。 Time t3, the capacitor C1 voltage rises linearly to Vin / 2, the voltage drops to zero capacitor C4, at this time can be zero-voltage switching transistor Q4. 与此同时,A点电位降至Vin/2,续流二极管Df 1自然导通。 At the same time, A down to point potential Vin / 2, the freewheeling diode Df 1 natural conduction. 5. 开关模态5 [t3-14][对应于附图8]在该时段零电压开通开关管Q4,开关管Q4虽然被开通,但并无电流流过。 The mode switch 5 [t3-14] [8 correspond to the drawings] turn transistor Q4 in the zero voltage period, while the switching transistor Q4 is turned on, but no current flows. 电流ipl 流经开关管Q2、变压器Trl原边绕组和续流二极管Dfl,电流ip2流经开关管Q2、变压器Tr2原边绕组和开关管Q5,电压vAB=vAC=0。6. 开关模态6 [t4-t5][对应于附图9]t4时刻,零电压关断开关管Q2,电流ipl和ip2给电容C2充电,同时通过电容Css 给电容C3放电。 Ipl current flowing through the switch Q2, primary winding of the transformer Trl and freewheeling diode Dfl, ip2 current flowing through switch Q2, primary winding of the transformer Tr2 and the transistor Q5, the voltage vAB = vAC = 0.6. Mode switch 6 [t4-t5] [9 corresponds to figures] T4 time, zero-voltage turn-off switching transistor Q2, current ipl and ip2 charging the capacitor C2, and the capacitor Css through the capacitor C3 discharges. 电压vAB与电压vAC同时由零变为负,使两个变压器的原边电流下降, 原边电流将不足以提供负载电流,副边四个整流二极管同时导通,两个变压器副边短路, 原边电压之和为零。 VAB vAC voltage and the voltage from zero to negative while the two transformer primary current decreases, the primary current is insufficient to supply the load current, four secondary rectifier diodes are simultaneously turned on, shorting the two secondary sides of the transformer, the original and zero voltage side. 在这段时间里,实际上是两个变压器的漏感与电容C2和C3谐振工作。 During this time, actually two transformer leakage inductance and capacitance C2 and C3 resonant work. 到t5时刻,电容C2电压上升至Vin/2,电容C3电压下降到零,二极管D3自然导通。 To time t5, capacitor C2 rises to the voltage Vin / 2, the voltage drops to zero capacitor C3, diode D3 natural conduction. 7. 丌关模态7 [t5-16][对应于附图10]t5时刻,二极管D3导通,将开关管Q3两端的电压箝在零,此时可以零电压开通开关管Q3。 7. Ji OFF mode 7 [t5-16] [corresponding to figures 10] t5 time, the diode D3 conducts, the voltage clamp across the switch Q3 at zero, this time can be zero-voltage switching transistor Q3. 此时副边整流二极管依旧同时导通,原边电压之和为零。 At this time, the secondary rectifier diode is still turned on simultaneously, and the primary voltage is zero. 原边电流ipl和ip2 同时线性下降,到t6时刻,原边电流ipl和ip2下降到零。 Ipl and ip2 primary current decreases linearly at the same time, to the time t6, the primary current falls to zero ipl and ip2. 8. 开关模态8 [t6-17][对应于附图ll]t6时刻,原边电流由正值过零,且向负方向线性增加。 8. Switch Mode 8 [t6-17] [corresponding to the reference ll] t6 time, the primary current by a positive value through zero and increases linearly in the negative direction. 由于此时原边电流不足以提供负载电流,副边整流管同时导通。 At this time, since the primary current is insufficient to supply the load current, the secondary rectifier simultaneously turned on. 9.开关模态9 [t7-t8][对应于附图12]到t7时刻,原边电流反向增加到折算至原边的负载电流,整流管DR1和DR4关断, 整流管DR2和DR3流过全部负载电流。 9. Switch Mode 9 [t7-t8] [12 correspond to the drawings] to time t7, the primary current increases to a reverse conversion to the primary load current, the rectifier DR1 and DR4 off rectifier DR2 and DR3 all the current flowing through the load. 变换器进入后半周期,工作情况与上述的半个周期类似。 After entering the half cycle of the converter, the operation similar to the above-described half cycle. 由附图3可知变换器在两电平模式下一个开关周期内包含12个开关模态,其中, [tO以前,t5]为前半周期,[t5, tll]为后半周期。 3 can be seen by reference converter 12 comprises a switch mode switching cycle in the two-level mode, wherein, [tO before, T5] is a first half cycle, [t5, tll] is a half of the cycle. 在前半周期中,[tO以前,t2]时段的工作情况与三电平模式下[tl, t4]时段相同,这里不再重复。 In the first half cycle, the [tO before, T2] operation period and the three-level mode [tl, t4] the same time, will not be repeated here. 下面对[t2, t6]时段中四个开关模态的工作情况进行具体分析。 Next, [t2, t6] period four switches operation modes specific analysis. 1. 开关模态l [t2-13][对应于附图13]t2时刻,零电压关断开关管Q2和Q5,原边电流ipl和ip2给电容C2充电,通过电容Css给电容C3放电,同时电流ip2沿着二极管D5续流。 1. Switching Mode l [t2-13] [13 correspond to the drawings] time T2, the zero voltage turn-off switching transistor Q2 and Q5, primary current ipl and ip2 charging the capacitor C2, the capacitor Css through the capacitor C3 discharges, while current ip2 along freewheeling diode D5. 原边电流下降,并且不足以提供负载电流,副边整流管同时导通,两个变压器副边短路,原边电压之和为零。 Primary-side current decreases, and insufficient to provide a load current, the secondary rectifier simultaneously turned on, shorting the two secondary sides of the transformer, and the primary voltage is zero. 在这段时间里,两个变压器的漏感与电容C2和C3谐振工作。 During this time, the leakage inductance of the transformer and two capacitors C2 and C3 resonant operation. 到t3时刻,电容C2电压上升至Vin/2,电容P电压下降到零,二极管D3自然导通。 Time t3, the capacitor C2 rises to the voltage Vin / 2, P capacitor voltage drops to zero, the diode D3 natural conduction. 2. 开关模态2 [t3-t4][对应于附图14]t3时刻,零电压开通开关管Q3,原边电流ip2继续从二极管D5流过。 2. Switch Mode 2 [t3-t4] [corresponding to figures 14] t3 time, zero-voltage switching tube Q3, the primary current ip2 continues to flow through the diode D5. 副边整流管依旧同时导通,副边短路,原边电压加在变压器的漏感上,原边电流线性下降。 Secondary rectifier still simultaneously turned on, shorting the secondary side, the primary voltage applied to the leakage inductance of the transformer, the primary current decreases linearly. 到t4 时刻,原边电流下降到零。 To t4, the primary current drops to zero. 3. 开关模态3 [t4-t5][对应于附图15]t4时刻,原边电流ipl和ip2下降至零,并且反方向增加,电流ip2从二极管D5 转移至开关管Q6中流通。 3. Switch Mode 3 [t4-t5] [corresponding to figures 15] t4 time ipl and ip2 primary current drops to zero, and increases in the opposite direction, current ip2 is transferred from the diode D5 to the switching transistor Q6 flowing. 由于原边电流不足以提供负载电流,副边整流管仍旧同时导通。 Since the primary current is insufficient to supply the load current, while the secondary rectifier is still turned on. 4. 开关模态4 [t5-16][对应于附图16]t5时刻,原边电流反向增加至折算到原边的负载电流,整流管DR1和DR4关断,整流管DR2和DR3流过全部负载电流,原边向副边提供能量。 4. Switch Mode 4 [t5-16] [corresponding to figures 16] t5 time, the primary current increases to a reverse conversion to the primary load current, the rectifier DR1 and DR4 off flow rectifier DR2 and DR3 over all load currents of both sides to provide energy to the secondary side. 变换器进入后半周期,工作情况与上述的半个周期类似。 After entering the half cycle of the converter, the operation similar to the above-described half cycle. (2)改进型零电压开关P丽组合型三电平直流变换器附图17和18为改讲.型,电压开关P丽组合擎三电平直流变换器结构示意图,它寸l:] 均由输入分压电容电路、i"半桥3电平变换器2 、全桥变换器S'、隔离变压器4 、 整流及滤波电路'5和箝位二极管6组成,电路结构与附图1中变换器大致相同,不同之处是:在原有变换器基础上,分别在半桥三电平变换器和全桥变换器中增加了两种箝位网络。附图17中,谐振电感Lr、变压器Trl与箝位二极管Dcl、 Dc2组成变压器超前型箝位网络;附图18中,谐振电感Lr、变压器Tr2与箝位二极管Del、 Dc2组成变压器滞后型箝位网络。改进型零电压开关PWM组合型三电平直流变换器的控制策略与附图1中变换器完全相同。下面以附图17为主电路结构,结合附图19-24叙述改进型零电压开关PWM组合型三电平直流变换器的具体工作原理。由附图19可知 17 and 18 to change talk (2) zero voltage switching P Li modified Combined three figures three level converter DC converter schematic structural, P Li voltage switch level composition engine, it inch l:] were dividing the input capacitance of the circuit, i "2 half-bridge three-level inverter, full-bridge converter S ', 4 isolation transformer, rectifier and filter circuit 5', and 6 composed of clamping diodes, the circuit structure and transform the drawings 1 It is substantially the same, except that: the converter on the basis of the original, are added two clamping network in three-level half-bridge converter and a full bridge converter 17 in the drawings, the resonant inductor Lr, the transformer Trl the clamp diode Dcl, Dc2 lead type clamping network consisting of a transformer;. in FIG. 18, the resonant inductor Lr, and the transformer Tr2 clamp diode Del, Dc2 clamping network consisting of a transformer Delay improved ZVS PWM three Combined electrical control strategy with the accompanying drawings lEVEL cONVERTER converter 1 in exactly following the main circuit configuration in FIG. 17, 19-24 described in conjunction with the improved compositions ZVS PWM three-level DC converter dRAWINGS specific works can be seen from Figure 19 换器在三电平模式中一个开关周期有20种开关模态。其中,[t0 以前,t9]为前半周期,[t9, U9]为后半周期。由于开关模态比较多,下面仅箝位二极管起箝位作用的开关模态加以分析。1. 开关模态l [t7-t8][对应于附图21]t7时刻,开关管Q3、 Q4与Q5导通,谐振电感Lr与电容CR1、 CR4谐振工作,即给电容CR1和CR4充电,原边电流ipl和谐振电感电流iLr增加。在该时段中,B点电压固定在Vin/2,而电压vOB由于电容CR1和CR4充电反向上升,故O点电位一直在下降。 到t8时刻,副边电压上升到(kl+k2)Vin/2,此时O点电压下降至零,箝位二极管Dc2 导通,将电压vOB箝在-Vin/2,因此将副边电压箝在(kl+k2)Vin/2,从而消除了由谐振电感Lr和电容CR1、 CR4谐振引起的电压尖峰和振荡。2. 开关模态2 [t8-19][对应于附图22]当二极管Dc2导通后,电流ipl阶跃下降为折算到变压器Trl原边的滤波电感电流iLf,由 Converter in a three level mode in a switching cycle has 20 switching modes. Wherein, [T0 before, T9] for the first half cycle, [t9, U9] is a half of the cycle. As more switch mode, the following only clamp the diode clamping action bit mode switching analyzed .1 switch mode l [t7-t8] [21 correspond to the drawings] time T7, the switch Q3, Q4 and Q5 is turned on, the resonant inductor Lr and the capacitor CR1 , CR4 resonant operation, i.e., charging the capacitor CR1 and CR4, and increase the primary current ipl resonant inductor current iLr. in this period, B the point at fixed voltage Vin / 2, and the voltage due to the capacitor CR1 and CR4 vOB reverse charging rise , so that the potential of the point O has been declining. to time t8, the secondary voltage rises to (kl + k2) Vin / 2, at this time point O voltage drops to zero, clamp diodes Dc2 is turned on, the voltage clamp in -Vin vOB / 2, so in the secondary voltage clamp (kl + k2) Vin / 2, thereby eliminating a resonant inductor Lr and the capacitors CR1, CR4 caused a resonant oscillation of the voltage spikes and .2 mode switch 2 [t8-19] [Figure 22 corresponds to] when the diode Dc2 is turned on, the current is decreased step ipl filter inductor current iLf converted to the primary side of the transformer Trl by 滤波电感电流iLf线性增加,原边电流ipl也随之增加,而谐振电感电流iLr 保持不变,它与原边电流ipl的差值从二极管Dc2中流过。到t9时刻,原边电流ipl 和谐振电感电流iLr相等,二极管Dc2关断。tl7时刻,变换器处于后半周期,开关管Q1、 Q2与Q6导通,其工作情况与前半周期类似。到tl8时刻,二极管Dcl导通,副边电压同样被箝位在(kl+k2)Vin/2。 ILf filter inductor current increases linearly, the primary current ipl also increases and the resonant inductor current iLr remains unchanged, it is the difference ipl primary current flows through the diode Dc2. To time t9, the primary current and the resonance ipl inductor current is equal to iLr, diode Dc2 .tl7 off time, the inverter is half of the cycle, the switch Q1, Q2 and Q6 are turned on, its first half cycle of operation is similar to the time tl8, conducting diode Dcl, the secondary voltage likewise clamped (kl + k2) Vin / 2. 由附图20可知变换器在两电平模式下一个开关周期内包含16个开关模态,其中, [tO以前,t7]为前半周期,[t7, tl5]为后半周期。 20 seen from the drawings a converter switching cycle comprises 16 switches modes in two-level mode, wherein, [tO before, T7] for the first half cycle, [t7, tl5] is a half of the cycle. 下面也仅对有箝位作用的开关模态进行分析。 Analysis hereinafter also only have the clamping action switch modality. 1,开关模态l [t5-t6][对应于附图23]t5时刻,开关管Q3、 Q4与Q6同时导通,谐振电感Lr与电容CR1 、 CR4谐振工作, 即给电容CR1和CR4充电,原边电流ipl和谐振电感电流iLr反向增加。 1, the switch mode l [t5-t6] [corresponding to figures 23] t5 time, the switch Q3, Q4 and Q6 are simultaneously turned on, the resonant inductor Lr and the capacitor CR1, CR4 resonance operation, i.e., charging the capacitor CR1 and CR4 , the primary current and the resonant inductor current iLr ipl reverse increases. 由于B点电位始终为Vin/2,因此0点电位随着电容CR1和CR4的充电不断下降。 Since the potential at the point B is always Vin / 2, so the zero point charge potential as the capacitance CR1 and CR4 declining. 到t6时刻,副边电压上升到klVin/2, O点电位下降到零。 To the time t6, the secondary voltage rises to klVin / 2, O point potential falls to zero. 此时二极管Dc2导通,将电压vOB箝在-Vin/2, 因此将副边电压箝在klVin/2,从而实现箝位功能。 At this time, diode Dc2 is turned on, the voltage clamp in vOB -Vin / 2, so the secondary voltage clamp at klVin / 2, thereby achieving a clamp. 2.开关模态2 [t6-17][对应于附图24]当二极管Dc2导通后,原边电流ipl阶跃下降为折算到变压器Trl原边的滤波电感电流iLf ,而电流iLr保持不变,它与电流ipl的差值从二极管Dc2中流过。 2. Switch Mode 2 [t6-17] [24 correspond to the drawings] When the diode Dc2 is turned on, the primary current falls to step ipl filter inductor current iLf converted to the primary side of the transformer Trl, remains while the current iLr change, which is the difference between the current ipl flows through the diode Dc2. t7时刻, 电流ipl和电流iLr相等,二极管Dc2关断。 t7, the current iLr and the current ipl equal, diode Dc2 is turned off. tl3时刻,变换器处于后半周期,开关管Q1、 Q2与Q5导通,其工作情况与前半周期类似。 tl3 time, the converter is in the latter half cycle, the switch Q1, Q2 and Q5 is turned on, its operation is similar to the first half cycle. 到U4时刻,二极管Dcl导通,副边电压同样被箝位在klVin/2。 Time to U4, diode Dcl conduction, the secondary voltage is clamped at the same klVin / 2. 在两电平模式下,箝位二极管在一个开关周期中只导通一次,发生在副边整流管电压箝位之后一段时间,对副边整流管起到箝位作用;而在三电平模式下,箝位二极管在一个开关周期中导通两次,其中只有一次起到箝位作用,另外一次则是冗余的。 In the two level mode, a switch in the clamp diode conducts for a period, after a period of time occurs secondary rectifier voltage clamp, the rectifier on the secondary clamping action functions; in mode three-level next, a clamping diode in the switching cycle is turned twice, wherein only one clamping action functions, additional time is redundant. 附图18中改进型变换器的箝位原理与附图17中变换器基本相同。 Improved clamping principle in the converter 18 and the reference transducer 17 is substantially the same drawings. 由此可见,在零电压开关P丽组合型三电平直流变换器中引入了箝位网络后,无论是在三电平模式还是两电平模式,都能比较好的消除副边整流管的电压尖峰,从而省去了有损吸收电路,实现箝位的目的。 After Thus, the introduction of the clamping network zero-voltage switching P-type three-level composition Li DC converter, whether the three-level mode or the two-level mode, can better eliminate the secondary rectifier voltage spikes, thereby eliminating the lossy snubber circuit object, to achieve clamping. 本发明的一个具体实例如下:输入直流电压:Vin=400〜800V;输出直流电压:Vo=54V; 输出电流:Io=20A;变压器Trl副原边变比:0.168;变压器Tr2副原边变比:0.149; 变压器Trl原边漏感:Llkl=2. 6uH;变压器Tr2原边漏感:Llk2=3uH;谐振电感:Lr=30uH; 输出滤波电感:Lf=13. 2uH;输出滤波电容:Cf=2200uFX2; M0SFET(Q1-Q6): SPW20N60S5; 续流二极管(Dfl、 Df2): DSEI30-06A;副边整流二极管(DR1-DR4): DSEP30-03A;开关频率:fs=100kHz。 A specific example of the present invention are as follows: Input DC voltage: Vin = 400~800V; output DC voltage: Vo = 54V; Output current: Io = 20A; Trl sub primary side of the transformer turns ratio: 0.168; primary transformer Tr2 sub ratio : 0.149; transformer Trl primary leakage inductance: Llkl = 2 6uH; transformer Tr2 primary leakage inductance:. Llk2 = 3uH; resonant inductor: Lr = 30uH; output filter inductor: Lf = 13 2uH; output filter capacitor:. Cf = 2200uFX2; M0SFET (Q1-Q6): SPW20N60S5; freewheeling diode (Dfl, Df2): DSEI30-06A; secondary rectifier diodes (DR1-DR4): DSEP30-03A; switching frequency: fs = 100kHz. 由以上描述可知,本发明提出的零电压开关P丽组合型三电平直流变换器及其改进型变换器具有如下优点:所有开关管的电压应力均为输入电压的一半;输出整流电压波形中高频分量小,可以减小输出滤波器,从而提高变换器的功率密度,改善变换器的动态特性;可以在三电平模式和两电平模式下切换工作,从而降低副边整流二极管的电压应力;利用变压器漏感和输出滤波电感和开关管的结电容可以实现开关管的零电压开关; 在改进型变换器中增加谐振电感,扩大了开关管实现零电压开关的负载范围,可以明显提高两电平模式下变换器的效率;引入两只箝位二极管,可以在三电平模式和两电平模式下消除副边整流管的电压尖峰,从而省去有损吸收电路,进一步提高变换器的效率。 From the above description, the present invention proposes a zero voltage switching P-type composition Li three level converter and its improved converter has the following advantages: all the switch voltage stress are half of the input voltage; high rectified voltage waveform output frequency component is small, the output filter can be reduced, thereby increasing the power density of the converter, to improve the dynamic characteristics of the converter; switching operation can be under the three-level mode and the two level mode, thereby reducing the voltage stress of the secondary side rectifying diode ; using the transformer leakage inductance and the output filter inductor and the transistor junction capacitance can achieve zero voltage switching of the switch; modified to increase the resonant inductor in the converter, the load switch expanded range of zero voltage switching, can significantly improve the two the efficiency of the converter power level mode; introducing two clamping diode rectifier can be eliminated secondary voltage spikes in the three-level mode and the two level mode, thereby eliminating the need for lossy snubber circuit, the converter further improved effectiveness.

Claims (3)

1. 一种零电压开关PWM组合型三电平直流变换器,包括由直流电源(Vin)及两个分压电容(Cd1、Cd2)串联后并联在直流电源(Vin)正负两端所组成的输入分压电容电路(1)、隔离变压器(4)、整流及滤波电路(5),其中整流及滤波电路(5)的组成是,四个整流二极管两两串联组成两路整流电路,该两路整流电路并联后的正负输出端并接输出滤波电感(Lf)与输出滤波电容(Cf)的串联电路构成回路,第一路整流电路两个整流二极管的串联点连于第一隔离变压器(Tr1)副边绕组的同名端,第二路整流电路两个二极管的串联点连于第二隔离变压器(Tr2)副边绕组的异名端,第一隔离变压器(Tr1)副边绕组异名端连于第二隔离变压器(Tr2)副边绕组同名端,其特征在于,还包括半桥三电平变换器(2)和全桥变换器(3),所述半桥三电平变换器(2)的组成是,将第一开关管(Q1)、第二开关管(Q2)、第三开 A zero-voltage switching PWM Combined three level converter, and comprising two voltage dividing capacitors (Cd1, Cd2) connected in series after the parallel combination of a DC power supply (Vin) DC power supply (Vin) consisting of positive and negative ends dividing capacitor input circuit (1), isolation transformer (4), rectifier and filter circuit (5), wherein the composition rectifier and filter circuit (5) that the two rectifier diodes four two-way rectifier circuit composed of two series, the positive and negative output of the rectifier circuit in parallel, and two-way connected to the output filter inductor (Lf of) constituting the circuit and the output filter capacitor (Cf) in series circuit, a rectifying diode in series to the first point of the two-way rectifier circuit connected to the first isolation transformer dotted terminal (Tr1 is) of the secondary winding, a second path point of the series circuit of two rectifier diodes connected to the second isolation transformer (Tr2 is) non-dotted end of the secondary winding of the first isolating transformer (Tr1 is) secondary winding name a second end connected to the isolation transformer (Tr2 is) the dot end of the secondary winding, characterized by further comprising a three-level half-bridge inverter (2) and a full-bridge converter (3), said three-level half-bridge inverter (2) a composition of the first switching transistor (Q1), the second switching transistor (Q2), a third opening 管(Q3)和第四开关管(Q4)依次串联后并接在输入分压电容电路(1)正负输出端,两个续流二极管(Df1、Df2)正向串联的串联电路与飞跨电容(Css)均同时并联在第一开关管(Q1)与第二开关管(Q2)的串联点和第三开关管(Q3)与第四开关管(Q4)的串联点之间,其中两个续流二极管(Df1、Df2)的串联点与两个分压电容(Cd1、Cd2)的串联点相连接,第一隔离变压器(Tr1)原边绕组的同名端连于第二开关管(Q2)与第三开关管(Q3)的串联点,异名端连接第一隔离变压器原边寄生漏感(Llk1)后连于两个续流二极管(Df1、Df2)的串联点,第一开关管(Q1)、第二开关管(Q2)、第三开关管(Q3)和第四开关管(Q4)各自并联寄生体二极管和寄生电容,所述全桥变换器(3)的组成是将第五开关管(Q5)与第六开关管(Q6)串联后并联在半桥三电平变换器(2)的第一开关管(Q1)与第二开关管(Q2)的串联点和第三开关管(Q3)与第四开关 A series circuit of the tube (Q3) and a fourth switching transistor (Q4) connected in series and the positive and negative output of the input voltage dividing capacitor circuit (1), two freewheeling diodes (Df1, Df2) connected in series with the forward flying capacitor (Css) are simultaneously connected in parallel between the first switching transistor (Q1) and a second switch (Q2) series point and the third switch (Q3) and the fourth switch (Q4) connected in series points, wherein two freewheeling diodes (Df1, Df2) connected in series with the two points dividing capacitor (Cd1, Cd2) connected in series points, a first isolating transformer (Tr1 is) the dot end of the primary winding connected to the second switching transistor (Q2 ) and the third switch (Q3) series point, dotted end connected to the primary side of the isolation transformer of the first parasitic leakage inductance (Llk1) connected to the two freewheeling diodes (Df1, Df2) series point, a first switch (Ql), a second switch (Q2), third switch (Q3) and a fourth switching transistor (Q4) each parallel parasitic diode and a parasitic capacitance of the body, consisting of the full-bridge converter (3) is the first after five series switching transistor (Q5) and the sixth switch (Q6 are) connected in parallel with the half-bridge three-level converter (2) of the first switching transistor (Q1) and a second switch (Q2) and the third point of the series switch (Q3) and the fourth switch 管(Q4)的串联点之间,第二隔离变压器(Tr2)原边绕组的异名端连接第二隔离变压器(Tr2)的原边寄生漏感(Llk2)后连于第五开关管(Q5)与第六开关管(Q6)的串联点,其同名端接在半桥三电平变换器(2)的第二开关管(Q2)与第三开关管(Q3)的串联点并与第一隔离变压器(Tr1)的同名端相连,第五、第六两个开关管(Q5、Q6)各自并联寄生体二极管和寄生电容。 A fifth switch connected to the series connection point between the pipe after the pipe (Q4), the second isolation transformer (Tr2 is) non-dotted end of the primary winding is connected to a second primary isolation transformer (Tr2 is) side parasitic leakage inductance (Llk2) (Q5 ) and the sixth switch (Q6 are) series points, terminated in its namesake three-level half-bridge inverter (2) a second switch (Q2) and the third switch (Q3) in series with the first point, and the same name as an isolation transformer (Tr1 is) connected to the end of the fifth, sixth two switches (Q5, Q6) each parallel parasitic capacitance and a parasitic body diode.
2、 一种零电压开关PWM组合型三电平直流变换器,包括由直流电源(Vin)及两个分压电容(Cdl、 Cd2)串联后并联在直流电源(Vin)正负两樓所组成的输入分压电容电路(1)、隔离变压器(4)、整流及滤波电路(5),其中整流及滤波电路(5)的组成是,四个整流二极管两两串联组成两路整流电路,该两路整流电路并联后的正负输出端并接输出滤波电感(Lf)与输出滤波电容(Cf)的串联电路构成回路,第一路整流电路两个整淹二极管的串联点连于第一隔离变压器(Trl)副边绕组的同名端,第二路整流电路两个二极管的串联点连于第二隔离变压器(Tr2)副边绕组的异名端,第一隔离变压器(Trl)副边绕组异名端连于第二隔离变压器(Tr2)副边绕组同名端,其特征在于,还包括半桥三电平变换器(2)和全桥变换器(3),所述半桥三电平变换器(2)的组成是,将第一开关管(Q1)、 第二开关管(Q2)、第 2, a combination of a zero-voltage switching PWM three-level DC converter, comprising a DC power supply (Vin) and the two voltage dividing capacitors (Cdl, Cd2) connected in parallel are connected in series after the direct current power supply (Vin) consisting of both negative and positive F dividing capacitor input circuit (1), isolation transformer (4), rectifier and filter circuit (5), wherein the composition rectifier and filter circuit (5) that the two rectifier diodes four two-way rectifier circuit composed of two series, the positive and negative outputs of the parallel connection and two rectifying circuit connected to the output filter inductor (Lf of) constituting the circuit and the output filter capacitor (Cf) in series circuit, a first rectifying circuit two full flooded road diodes connected in series to the first isolation point dot end of the secondary winding of the transformer (Trl), the second point of the series circuit of two rectifier diodes passage connected to the second isolation transformer (Tr2 is) non-dotted end of the secondary winding, (Trl) a first secondary winding of the isolation transformer iso were connected to the second end of the isolation transformer (Tr2 is) the dot end of the secondary winding, characterized by further comprising a three-level half-bridge inverter (2) and a full-bridge converter (3), said half-bridge three-level transform composition (2) it is the first switching transistor (Q1), the second switching transistor (Q2), the first 开关管(Q3)和第四开关管(04)依次串联后并接在输入分压电容电路(l)正负输出端,两个续流二极管(Dfl、 Df2)正向串联的串联电路与飞跨电容(Css)均同时并联在第一开关管(Ql)与第二开关管(Q2)的串联点和第三开关管(Q3)与第西开关管(Q4)的串联点之间,其中两个续流二极管(Dfl、 Df2)的串联点与两个分压电容(Cdl、Cd2)的串联点相连接,第一隔离变压器(Trl)康边绕组的同名端接谐振电感(Lr)后连于第二开关管(Q2)与第三开关管(Q3)的串联点,异名壤连于两个续流二极管(Dfl、 Df2)的串联点,第一开关管(Q1)、第二开关管(Q2)、第三开关管(Q3)和第四开关管(Q4〉各自并联寄生体二极管和寄生电容,两个箝位二极管(Dcl、 Dc2)串联后并联在输入分压电容电路(l)正负输出端,两个箝位二极管(Dcl、 Dc2)的串联点连于第一隔离变压器(Trl)原边绕组的同名端与谐振电感(Lr)的连接点:所述 After switching transistor (Q3) and a fourth switch (04) sequentially and serially connected to the negative output of the input voltage dividing capacitor circuit (l), two freewheeling diodes (Dfl, Df2) forward in series with the series circuit fly across the capacitor (Css) are simultaneously connected in parallel between the first switch (Ql,) and a second switch (Q2) series point and the third switch (Q3) and the second switch West (Q4) connected in series points, wherein two freewheeling diodes (Dfl, Df2) connected in series with the two points dividing capacitors (Cdl, Cd2) connected in series points, the first isolation transformer (Trl) with the same name Kang winding terminating the resonant inductor (Lr of) connected to the second switching transistor (Q2) and the third switch (Q3) in series points, synonyms soil connected in series to the two points freewheeling diode (Dfl, Df2), the first switching transistor (Ql), second switch (Q2), third switch (Q3) and a fourth switching transistor (Q4> each parallel parasitic capacitance and a parasitic body diode, two clamping diodes (Dcl, Dc2) in parallel with the input capacitance circuit pressure component (the series l) positive and negative outputs, two clamping diodes (Dcl, Dc2) connected in series to the first point of the isolation transformer (Trl) the dot end of the primary winding and the resonant inductor (Lr of) connection point: the 桥变换蕃(3)的组成是将第五开关管(Q5) 与第六开关管(06)串联后并联在半桥三电平变换器(2)的第一开关管(Ql)与第二开关管(Q2)的串联点和第三开关管(Q3)与第四开关管(Q4)的串联点之间,第二隔离变压器(Tr2) 原边绕组的异名端连于第五开关管(Q5)与第六开关管(Q6)的串联点,其同名端接在半桥三电平变换器(2)的第二开关管(Q2)与第三开关管(Q3)的串联点,第五、第六两个开关管(Q5、 Q6)同样并联寄生体二极管和寄生电容。 Fan composition bridge converter (3) is connected in parallel to the series fifth switching transistor (Q5) and the sixth switch (06) in the three-level half-bridge inverter (2) a first switch (Ql,) and a second between the switch (Q2) series point and the third switch (Q3) and the fourth switch (Q4) connected in series points-dotted end of the primary winding of the second isolating transformer (Tr2 is) connected to the fifth switching transistor (Q5) and the sixth switch (Q6 are) series points, terminated in its namesake three-level half-bridge inverter (2) a second switch (Q2) and the third switch (Q3) in series points, fifth, sixth two switches (Q5, Q6) likewise parallel parasitic capacitance and a parasitic body diode.
3、 一种零电压开关PWM组合型三电平直流变换器,包括由直流电源(Vin)及两个分压电容(Cdl、 Cd2)串联后并联在直流电源(Vin)正负两櫬所组成的输入分压电容电路(1)、隔离变压器(4)、整流及滤波电路(5),其中整流及滤波电路(5)的组成是,四个整流二极管两两串联组成两路整流电路,该两路整流电路并联后的正负输出端并接输出滤波电感(Lf)与输出滤波电容(Cf)的串联电路构成回路,第一路整流电路两个整流二极管的串联点连于第一隔离变压器(Trl)副边绕组的同名端,第二路整流电路两个二极管的串联点连于第二隔离变压器(Tr2)副边绕组的异名端,第一隔离变压器(Trl)副边绕组异名端连于第二隔离变压器(Tr2)副边绕组同名端,其特征在于,还包括半桥三电平变换器(2)和全桥变换器(3),所述半桥三电平变换器(2)的组成是,将第一开关管(Q1)、 第二开关管(Q2)、第三 After 3 series, a combination of a zero-voltage switching PWM three-level DC converter, comprising a DC power supply (Vin) and the two voltage dividing capacitors (Cdl, Cd2) connected in parallel to a DC power supply (Vin) consisting of both negative and positive coffin dividing capacitor input circuit (1), isolation transformer (4), rectifier and filter circuit (5), wherein the composition rectifier and filter circuit (5) that the two rectifier diodes four two-way rectifier circuit composed of two series, the positive and negative output of the rectifier circuit in parallel, and two-way connected to the output filter inductor (Lf of) constituting the circuit and the output filter capacitor (Cf) in series circuit, a rectifying diode in series to the first point of the two-way rectifier circuit connected to the first isolation transformer dotted terminal (Trl) of the secondary winding, a second path point of the series circuit of two rectifier diodes connected to the second isolation transformer (Tr2 is) non-dotted end of the secondary winding of the first isolating transformer (Trl) secondary winding name a second end connected to the isolation transformer (Tr2 is) the dot end of the secondary winding, characterized by further comprising a three-level half-bridge inverter (2) and a full-bridge converter (3), said three-level half-bridge inverter (2) a composition of the first switching transistor (Q1), the second switching transistor (Q2), third 开关管(Q3)和第四开关管(Q4)依次串联后并接在输入分压电容电路(l)正负输出端,两个续流二极管(Dfl、 Df2)正向串联的串联电路与飞跨电容(Css)均同时并联在第一开关管(Q1)与第二开关管(Q2)的串联点和第三开关管(Q3)与第四开关管(Q4)的串联点之间,其中两个续流二极管(Dfl、 Df2)的串联点与两个分压电容(Cdl、 Cd2)的串联点相连接,第一隔离变压器(Trl)原边绕组的同名端连于第二开关管(Q2)与第三开关管(Q3)的串联点,异名端连于两个续流二极管(Dfl、 Df2)的串联点,第一开关管(Q1)、第二开关管(Q2)、第三开关管(Q3)和第四开关管(Q4)各自并联寄生体二极管和寄生电容;所述全桥变换器(3)的组成是将第五开关管(Q5)与第六开关管(06)串联后并联在半桥三电平变换器(2)的第一开关管(Ql)与第二开关管(Q2)的串联点和第三开关管(Q3)与第四开关管(04)的串联点之间,第二隔离变压 After switching transistor (Q3) and a fourth switching transistor (Q4) connected in series and the positive and negative output of the input voltage dividing capacitor circuit (l), two freewheeling diodes (Dfl, Df2) forward in series with the series circuit fly across the capacitor (Css) are simultaneously connected in parallel between the first switching transistor (Q1) and a second switch (Q2) series point and the third switch (Q3) and the fourth switch (Q4) connected in series points, wherein two freewheeling diodes (Dfl, Df2) connected in series with the two points dividing capacitors (Cdl, Cd2) connected in series points, a first isolating transformer (Trl) primary winding is connected to the dotted end of the second switching transistor ( Q2) and the third switch (Q3) series point, dotted end points connected in series in two freewheeling diodes (Dfl, Df2), the first switching transistor (Ql), a second switch (Q2), the first three switching transistor (Q3) and a fourth switching transistor (Q4) each parallel parasitic capacitance and a parasitic body diode; composition of the full bridge converter (3) is the fifth switching transistor (Q5) and the sixth switch (06 ) in parallel with the series half-bridge three-level converter (2) a first switch (Ql,) and a second switch (Q2) series point and the third switch (Q3) and the fourth switch (04) series between the points, a second isolation transformer 器(Tr2)原边绕组的异名壤连于第五开关管(Q5)与第六开关管(06)的串联点,其同名埔连于谐振电感(Lr)后接在半桥三电平变换器(2)的第二开关管(Q2)与第三开关管(Q3)的串联点,第五、第六两个开关管(Q5、 Q6)同样并联寄生体二极管和寄生电容,两个箝位二极管(Dcl、 Dc2)串联后并联在输入分压电容电路(l)正负输出端,两个箝位二极管(Dcl、 Dc2)的串联点连于第二瞎离变压器(Tr2)原边绕组的同名端与谐振电感(Lr)的连接点. Synonyms soil after the primary winding unit (Tr2 is) connected to the fifth switching transistor (Q5) and the sixth switch (06) series point, Po attached to its namesake the resonant inductor (Lr of) connected to the half-bridge three-level converter (2) a second switch (Q2) and the third switch (Q3) in series points, fifth, sixth two switches (Q5, Q6) likewise parallel parasitic capacitance and a parasitic body diode, two after the series to a parallel clamp diode (Dcl, Dc2) in the positive and negative output of the input voltage dividing capacitor circuit (l), two clamping diodes (Dcl, Dc2) connected in series to the second blind spot from the transformer (Tr2 is) primary dot end of winding of the resonant inductor (Lr of) connection point.
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CN104539160A (en) * 2014-11-29 2015-04-22 西安爱科赛博电气股份有限公司 Ultralow-output-voltage-ripple diode-clamped seven-level direct-current converter and direct-current power supply
CN104539160B (en) * 2014-11-29 2017-04-19 西安爱科赛博电气股份有限公司 Ultralow-output-voltage-ripple diode-clamped multi-level direct-current converter and direct-current power supply

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