CN1120561C - Mixed bridge-type zero-voltage and zero-current switch three level DC converter - Google Patents

Mixed bridge-type zero-voltage and zero-current switch three level DC converter Download PDF

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CN1120561C
CN1120561C CN01127182A CN01127182A CN1120561C CN 1120561 C CN1120561 C CN 1120561C CN 01127182 A CN01127182 A CN 01127182A CN 01127182 A CN01127182 A CN 01127182A CN 1120561 C CN1120561 C CN 1120561C
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voltage
zero
switch
circuit
arm
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CN1336715A (en
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阮新波
李斌
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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

一种零电压零电流开关混合型全桥三电平直流变换器属于直流变换器。 A zero-voltage and zero-current switching hybrid full-bridge three-level DC converter DC converter belongs. 包括输入分压电容电路(1)、阻断电容电路(4)、隔离变压器(5)、整流滤波电路(6),其特点是还包括三电平逆变桥臂(2)与两电平逆变桥臂(3)。 Dividing capacitor comprising an input circuit (1), blocking capacitor circuit (4), an isolating transformer (5), a rectifying filter circuit (6), characterized by further comprising a three-level inverter bridge arm (2) and the two-level inverter bridge arm (3). 三电平逆变桥臂,其开关管的电压应力为输入电压的一半,可在很宽的负载范围内实现零电压开关,可选用MOSFET;两电平逆变桥臂其开关管的电压应力为输入电压可在很宽的负载范围内实现零电流开关,可先用IGBT,且体积小,重量轻,动态特性好等优点。 Voltage stress two-level inverter bridge arm of the switching tube; three-level inverter bridge arm, which switch voltage stress is half the input voltage, may be implemented in a very wide load range zero voltage switching MOSFET can be selected input voltage zero-current switching can be achieved over a wide load range, to use the IGBT, and the small size, light weight, and good dynamic characteristics and the like.

Description

零电压零电流开关混合型全桥三电平直流变换器 ZVZCS hybrid switching full-bridge three-level DC converter

技术领域 FIELD

本发明的零电压零电流开关混合型全桥三电平直流变换器,属电能变换装置的直流变换器。 ZVZCS hybrid switch of the present invention a full-bridge three-level DC converter, the converter is a DC power conversion apparatus.

背景技术 Background technique

随着电力电子技术的发展,对电能变换器的要求越来越高,特别是对输入功率因数的要求越来越高。 With the development of power electronics, the requirements of increasingly high power converter, in particular, is a requirement for increasing the input power factor. 经三相功率因数校正后电路的输出电压一般可达760~800V,有时甚至达到1000V,这就要求提高后级的直流变换器的开关管电压定额,使得很难选择合适的功率开关管。 Output voltage of the circuit after the three-phase power factor correction is generally up to 760 ~ 800V, and sometimes even up to 1000V, which requires increasing the switching stage after the tube voltage rating DC converter, making it difficult to select the appropriate power switch. 而三电平直流变换器开关管的电压应力为输入直流电压的一半,因此很容易选择合适的开关管。 Stressed the voltage level converter switch half of the input DC voltage, it is easy to select a suitable switch.

为了减小变换器的体积和重量,必须提高开关频率,这就要求实现开关管的软开关(即零电压开关或零电流开关),以减小开关损耗。 In order to reduce the volume and weight of the transformer, the switching frequency must be increased, which requires a soft switching switch (i.e., zero voltage switching or the zero current switching), to reduce switching losses. 目前已有软开关三电平直流变换器可分为两类:零电压开关和零电压零电流开关。 At present, three-level soft switching DC-DC converter can be divided into two categories: zero voltage switching and zero-voltage and zero-current switching. 零电压开关三电平直流变换器的外面两只开关管可在很宽的负载范围内实现零电压开关,但里面的两只开关管在负载较轻时不能实现零电压开关;对于零电压零电流开关三电平直流变换器(专利号:00219197.0),其外面两只开关管可在很宽的负载范围内实现零电压开关,里面两只开关管可在很宽的负载范围内实现零电流开关。 Outside the three-level zero-voltage switching DC converter switch two zero-voltage switching can be achieved over a wide range of loads, but in which the two switch lighter load can not achieve zero voltage switching; for ZVS current switch three level converter (patent number: 00219197.0), the outside of which two switch can achieve zero voltage switching in a wide range of loads which two zero current switch may be implemented in a very wide load range switch. 外面的两只开关管可选用MOSFET,里面的两只开关管可选用IGBT。 Outer two optional switch MOSFET, inside two optional switch IGBT. 对于目前器件水平来说,很容易购买到高压的IGBT(比如1200V),因此IGBT用在这里没有发挥其优势。 For the current device level, it is very easy to buy high-pressure IGBT (such as 1200V), the IGBT is used here not play to their strengths.

发明内容 SUMMARY

本发明的目的在于提供一种在宽负载范围内实现开关的软开关,能充分利用高压开关管IGBT,同时又能减小输入和输出滤波器体积重量,且能改善变换器动态特性的零电压零电流开关混合型全桥三电平直流变换器。 The present invention aims to provide a wide load range to achieve soft-switching of the switch, to take advantage of the high pressure switch the IGBT, while reducing the volume and weight input and output filters, and can improve the dynamic characteristics of zero-voltage converter mixed zero-current switching full-bridge three-level DC converter. 这种直流变换器包括输入分压电容电路,阻断电容电路,隔离变压器,整流滤波电路,其特点是,逆变桥电路由三电平逆变桥臂和两电平逆变桥臂所组成。 Such DC converter includes an input capacitance voltage division circuit, a blocking capacitor circuit, an isolation transformer, rectifier and filter circuit, characterized in that the inverter bridge circuit consists of a three-level inverter bridge arm and the two-level inverter bridge arm consisting of . 由于该直流变换器的一个桥臂为三电平桥臂,其开关管的电压应力为输入电压的一半,可在很宽的负载范围内实现零电压开关,因此可以选用MOSFET;另一个桥臂为两电平桥臂,由两个开关管组成,其开关管的电压应力为输入电压,可在很宽的负载范围内实现零电流开关,因此可以选用IGBT;该变换器输出整流电压波形的交流分量很小,因此可以大大减小输出滤波器,从而减小滤波器的体积和重量,并且改善变换器的动态特性;该变换器的输入电流脉动很小,因此可以减小输入滤波器。 Since one leg of the DC converter for three-level bridge arm, which switch voltage stress is half the input voltage, zero voltage switching can be achieved over a wide load range, it is possible to choose the MOSFET; the other arm a two-level bridge arms composed of two switches, which switch the voltage stress is the input voltage, zero-current switching can be achieved over a wide load range, it is possible to choose the IGBT; the converter output voltage waveform of the rectified AC component is small, the output filter can be greatly reduced, thereby reducing the weight and volume of the filter, and improve the dynamic performance of the converter; small input current ripple of the converter, the input filter can be reduced.

附图说明 BRIEF DESCRIPTION

附图1、本发明的电路组成示意图。 Figure 1, a schematic diagram of the circuit composition of the present invention.

附图2-6、本发明的几种不同组成形式的电路实施例图。 Figures 2-6, consisting of several different forms of embodiment of FIG circuit of the present invention.

附图7、本发明的主要波形示意图。 Figure 7, a schematic diagram of the main waveforms of the present invention.

附图8-15、本发明各开关模态的等效电路示意图。 Figures 8-15, a schematic view of an equivalent circuit of each switching mode of the present invention.

附图1中各虚线框内的标号名称:1、输入分压电容电路,2、三电平逆变桥臂,3、两电平逆变桥臂,4、阻断电容电路,5、隔离变压器,6、整流滤波电路。 Label name in each dashed box in the drawings 1: 1, the input capacitance dividing circuit 2, a three-level inverter bridge arm, three, two-level inverter bridge arms 4, blocking capacitor circuit 5, isolation transformer 6, a rectifying smoothing circuit.

具体实施方式 Detailed ways

根据附图1-6叙述本发明的具体组成。 Figures 16 is described according to the specific composition of the present invention.

附图1是本发明的基本电路组成示意图,在输入分压电容电路1中,分压电容Cin1和Cin2的容量相等,且很大,它们的电压均为输入电源电压Vin的一半,即Vcin1=Vcin2=Vin/2。 1 is a basic schematic diagram illustrating a circuit of the invention, the input capacitance dividing circuit 1, the voltage dividing capacitors Cin1 and Cin2 equal capacity, and large, they are half of the input voltage of the power supply voltage Vin, i.e. Vcin1 = Vcin2 = Vin / 2.

三电平逆变桥臂2的构成是,四只开关管Q1、Q2、Q3、Q4分别反向并联二极管D1、D2、D3、D4再并联结电容(或外接电容)C1、C2、C3、C4,其中开关管Q1与Q4组成超前管,Q2与Q3组成的滞后管上分别并联两个串联的续流二极管D7、D8和联结电容Css,并联电容Css的作用在于将两对开关管Q1与Q4和Q2与Q3的开关过程连接起来。 Three-level inverter bridge arm constituted 2 is four switch Q1, Q2, Q3, Q4, respectively, antiparallel diodes D1, D2, D3, D4 and then coupling capacitance (or external capacitors) C1, C2, C3, C4, switch Q1 and Q4 wherein the composition leading pipe, two parallel freewheeling diode D7 are connected in series with the hysteresis transistor Q2 Q3 composition, D8 and the coupling capacitor Css, the role of the parallel capacitor Css in that the two switching transistors Q1 and Q3 and Q4 and Q2 are connected to the switching process. 在变换器稳态工作时,电容Css上的电压恒定为Vin/2。 When the converter steady state operation, the voltage on the capacitor Css constant at Vin / 2. Q1、Q2、Q3、Q4的电压应力均为输入电压的一半,可在很宽的负载范围内实现零电压开关,因此可以选用MOSFET开关管。 Q1, Q2, Q3, and Q4 are voltage stress half of the input voltage, zero voltage switching can be achieved over a wide load range, it is possible to choose MOSFET switch.

两电平逆变桥臂3,由两只开关管Q5与Q6和两个二极管D5与D6所组成。 Two-level inverter bridge arm 3, by the two switch Q5 and Q6 and diodes D5 and D6 are two components. 两个二极管D5、D6既可分别与相应的开关管Q5、Q6串联(如图1所示),也可分别与Q5、Q6并联(如附图2~6所示),其开关管的电压应力为输入电压,可在很宽的负载范围内实现零电流开关,因此可以选用高压开关管IGBT。 Two diodes D5, D6, respectively, both with a respective switch Q5, Q6 connected in series (FIG. 1), may be respectively Q5, Q6 connected in parallel (as shown in figures 2 to 6), the switching voltage of the tube stress is the input voltage, zero-current switching can be achieved over a wide load range, it is possible to choose the high pressure switch IGBT.

阻断电容电路4,用来实现Q5与Q6零电流开关。 Blocking capacitor circuit 4 for realizing zero-current switching Q5 and Q6.

隔离变压器5与整流滤波电路6均可采用现有技术。 Isolation transformer rectifier filter circuit 5 and 6 may be employed prior art.

附图2是在图1中的隔离变压器5原边串联一只饱和电感Ls。 FIG 2 is a 1 in 5 of the isolation transformer primary side series a saturation inductance Ls.

附图3是将图1中的阻断电容Cb移到隔离变压器5副边,与一个开关管Qb相串联,Qb的S极与输出整流两个二极管DR1、DR2的阴极相连,阻断电容Cb的另一端与隔离变压器5副边绕组的中心抽头相连。 Figure 3 is a side 5, and a switch in series blocking capacitor Cb Qb in FIG 1 move isolation transformer, connected to the S pole of the two Qb output rectifying diodes DR1, DR2 cathode, blocking capacitor Cb 5 center winding of the isolation transformer and the other end is connected to the tap.

附图4是将图1中的阻断电容Cb去掉,在整流滤波电路6中加入两只二极管Db1和Db2以及一只电容Cb1。 Figure 4 is the blocking capacitor Cb is removed in FIG. 1, the rectifier and filter circuit 6 is added two diodes Db1 and Db2 and a capacitor Cb1. 即一只二极管Db1与一只电容Cb1串联后并联在隔离变压器副边的输出端,另一只二极管Db2跨接在二极管Db1、电容Cb1的串接点与滤波电感Lf、滤波电容Cf的串接点之间。 I.e. a diode Db1 and Cb1 after a series capacitor connected in parallel with the output of the isolation transformer secondary side, the other diode Db2 is connected across the diode Db1, tandem node capacitance Cb1 point series inductor Lf of the filter, the filter capacitor Cf between.

附图5同样将图1中的阻断电容Cb去掉,在整流滤波电路6中加入两只电容Cb1和Cb2以及三只二极管Db1、Db2、和Db3,即一只二极管Db1与一只电容Cb1串联后并接在隔离变压器副边输出端,另一只电容Cb2与第二只二极管Db2串联后并接在整流滤波电路的输入端,第三只二极管Db3跨接上述两串联电路的串接点上。 Figure 5 likewise blocking capacitor Cb is removed in FIG. 1, the rectifier and filter circuit 6 is added in two capacitors Cb1 and Cb2 and three diodes Db1, Db2, Db3, and, i.e., a diode Db1 and a series capacitor Cb1 after the secondary side and an output terminal connected to the isolation transformer, and the other only the second capacitor Cb2 diode Db2 is connected in series with the input terminal of the rectifier filter circuit, the third series only diode Db3 points across these two series circuits.

附图6将图1中的阻断电容Cb移到整流滤波电路中,同时在隔离变压器5中增加两个副边绕组,与三个二极管Da1、Da2、和Da3共同组成电流复位电路。 Figure 6 FIG blocking capacitor Cb moves to the rectifier and filter circuit 1, the two secondary windings while increasing the isolation transformer 5, and three diodes Da1, Da2, Da3, and together constitute the reset circuit current.

附图2-6与附图1相比没有本质上的差异,但附图3、附图4和附图5可较好抑制输出整流管上的电压尖峰。 2-6 no essential difference compared with reference to Figure 1, but in FIG. 3, FIGS. 4 and 5 can preferably suppress voltage spikes on the output rectifier.

下面以附图1为例,结合附图7~15叙述本发明的具体工作原理,由附图7可知整个变换器在一个开关周期中有14种开关模态,分别以〔t0时刻〕、〔t0t1〕、〔t1t2〕、〔t2t3〕、〔t3t4〕、〔t4t5〕、〔t5t6〕、〔t6t7〕、〔t7t8〕、〔t8t9〕、〔t9t10〕、〔t10t11〕、〔t11t12〕、〔t12t13〕〔t13t14〕(见附图7),其中,〔t0t7〕为前半周期,〔t7t14〕为后半周期。 1 as an example below to the drawings, works in conjunction with the accompanying drawings 7 to 15 described in the present invention, the entire transducer 14 kinds of switches in a switching mode cycle 7 seen from the drawings, each time t0 [to], [ t0t1], [t1t2], [t2t3], [t3t4], [t4t5], [t5t6], [t6t7], [t7t8], [t8t9], [t9t10], [t10t11], [t11t12], [t12t13] [t13t14] (see Figure 7), wherein t0t7 [] of the first half cycle, [as] t7t14 half cycle. 下面对〔t0t7〕的各开关模态的工作情况进行具体分析。 Next, the operation of each switching mode] to [t0t7 specific analysis. 在附图7中,作了如下假设:a)两只输入分压电容分别以两个电压为Vin/2的电压源替代,输出滤波电路以一个电流为输出电流I0的电流源替代。 In Figure 7, the following assumptions are made: a) two input capacitors, respectively dividing two voltages as a voltage source Vin / 2 is replaced with a filter circuit output current is the output current source alternative current I0. 1、开关模态0〔t0时刻之前〕〔对应于附图8〕在t0时刻以前,Q1、Q2和Q6导通,vAB=Vin,原边给负载供电,原边电流ip给阻断电容Cb充电。 1, prior to the time t0 [Mode] switch corresponding to [0] in Figure 8 before the time t0, Q1, Q2 and Q6 are turned on, vAB = Vin, the primary power supply to the load, the primary current ip to the blocking capacitor Cb charge. 输出整流管DR1导通,DR2截止。 Output rectifier DR1 turned on, DR2 is turned off. 在t0时刻,ip=Ip0=I0/K,其中K为变压器原副边匝比。 At t0, ip = Ip0 = I0 / K, where K is the turns ratio of the transformer primary and secondary windings. Cb的电压为Vcb(t0)。 Cb is a voltage Vcb (t0). 2、开关模态1〔t0t1〕〔对应于附图9〕t1时刻关断Q1,ip给C1充电,同时通过电容Css给C4放电。 2, the switch mode t0t1 [1] [9] corresponds to the reference time t1 off Q1, ip charges C1, while the C4 to discharge through the capacitance Css. 由于有C1和C4,Q1是零电压关断。 Because C1 and C4, Q1 is a zero voltage turn-off. 此时Llk和Lf相串联,ip近似保持Ip0不变。 At this time Llk and Lf in series, ip Ip0 remains approximately constant. ip继续给Cb充电。 ip Cb continue to charge. C1的电压线性上升,C4的电压线性下降。 Voltage rises linearly C1, C4 linear voltage drop. 在t1时刻,C1的电压上升到Vin/2时,C4的电压下降到0,A点电位为Vin/2,D7自然导通。 At time t1, the voltage of C1 increases to Vin / 2, the voltage drops to C4 is 0, A is a point potential Vin / 2, D7 natural conduction. 3、开关模态2〔t1t2〕〔对应于附图10〕当D7导通后,C4的电压被箝在0,因此可以零电压开通Q4。 3, the switch mode t1t2 [2] [10] corresponding to the reference D7 is turned on when the voltage clamp C4 is 0, can be ZVS Q4. Q4与Q1驱动信号之间的死区时间td(14)>t01。 The dead time between the driving signals Q1 and Q4 td (14)> t01. 在此段时间里,vAB=Vin/2,原边继续给负载供电,ip给Cb充电。 During this time, vAB = Vin / 2, the primary side continues to supply the load, ip charge to Cb. 4、开关模态3〔t2t3〕〔对应于附图11〕t2时刻关断Q2,ip给C2充电,同时通过电容Css给C3放电。 4, the switch mode t2t3 [3] [11] corresponding to the reference time t2 off Q2, ip charging C2, and C3 to discharge through the capacitor Css. 由于有C2和C3,Q2是零电压关断。 Because C2 and C3, Q2 is a zero voltage turn-off. 此时Llk和Lf相串联,ip=Ip0。 At this time Llk and Lf in series, ip = Ip0. Ip继续给Cb充电,由于Cb很大,可认为其电压在这段时间里基本不变。 Ip continue to charge Cb, Cb because the large voltage can be considered basically unchanged during that time. C2的电压线性上升,C3的电压线性下降。 Voltage rises linearly C2, C3 voltage decreases linearly. 在t3时刻,C2的电压上升到Vin/2,C3的电压下降到0,D3自然导通。 At time t3, C2 rises to the voltage Vin / 2, C3 voltage drops to 0, D3 natural conduction. 5、开关模态4〔t3t4〕〔对应于附图12〕当D3导通后,C3的电压被箝在0,因此可以零电压开通Q3。 5, the switch mode t3t4 [4] [12] When the corresponding reference D3 conducts after, C3 voltage is clamped at 0, it is possible ZVS Q3. 在这段时间里,D3、D6和Q6导通,vAB=0。 During this time, D3, D6 and Q6 are turned on, vAB = 0. vcb使ip开始减小,ip不足以提供负载电流,因此DR1和DR2同时导通,这样变压器原、副边绕组电压均为零。 begins to decrease so vcb ip, ip insufficient to provide the load current, DR1 and DR2 are simultaneously turned on, so that the transformer primary, secondary winding voltages are zero. 此时vcb全部加在Llk上,ip减小,vcb上升。 At this time, all added to the vcb Llk, ip reduced, vcb rise. 由于Llk较小,而Cb较大,因此可认为vcb在这个开关模态中基本不变,ip近似线减小。 Since Llk small, large and Cb, thus can be considered substantially constant vcb this switch modality, ip approximate line is reduced. 在ip下降到零。 In the ip dropped to zero. 开关模态的持续时间为:6、开关模态5〔t4t5〕〔对应于附图13〕在此开关模态中,ip有反向流动的趋势,但是D6的存在使ip保持在零,此时vB=-Vcbp。 Duration of the mode switch is: 6, mode switch 5 [t4t5] [13] In the drawings corresponding to this switch modality, ip trend reverse flow, but that the presence of D6 ip at zero, this when vB = -Vcbp. 两个整流管同时导通,均分负载电流。 Two rectifier simultaneously turned on, the load current sharing. 7、开关模态6〔t5t6〕〔对应于附图14〕t5时刻关断Q6,此时Q6中并没有电流流过,因此Q6是零电流关断。 7, the switch mode t5t6 [6] [14] corresponding to the reference time t5 off Q6, Q6 at this time and no current flows, and therefore zero current Q6 is turned off. 在很小的延时后,开通Q5,由于Llk的存在,ip不能突变,Q6是零电流开通。 After a small delay, opening Q5, due to the presence of Llk, ip not mutated, Q6 is zero current turn. 由于ip不足以于提供负载电流,两个整流管依然同时导通,变压器的原、副边绕组被钳在零电压。 Ip insufficient due to the load current, while still conducting two rectifier transformer primary, secondary winding is clamped at zero voltage. 此时加在Llk上的电压为-(Vin+Vcbp),ip从零开始反方向线性增加。 At this time, the voltage applied to the Llk is - (Vin + Vcbp), ip scratch opposite direction increases linearly. 在t6时刻,ip反方向增加到折算到原边的负载电流I0/K。 At t6, ip reverse direction increases the load converted to the primary side current I0 / K. 该开关模态的时间为:8、开关模态7〔t6t7〕〔对应附图14〕从t6时刻开始,原边为负载提供能量,同时给Cb反向充电。 The time to switch modes: 8, switch mode t6t7 [7] [14] corresponding reference from the start time t6, the primary energy delivered to the load, while the reverse charge to Cb. DR1关断,所有负载电流均流过DR2。 DR1 off all load currents are flowing through DR2.

在t7时刻,关断Q4,开始另一个半周期〔t7t14〕,其工作的情况类似于前面描述的〔t0T7〕。 At time t7, off Q4, the other half-cycle begins t7t14 [], which work similar to the case previously described [t0T7].

本发明的一个具体实例如下:输入交流电压380V/50HZ交流电,经过整流滤波后得到直流电压为Vin=530VDC;输出直流电压为V0=54VDC;输出电流I0=50A;变压器原副边匝比K=7;输出滤波电感为Lf=10μH;输出滤波电容为Cf=10000μF;联结电容Css为2.2μF;开关管Q1-Q4(包括其反并二极管D1-D4和结电容C1-C4)为MOSFET(型号为IRF460);开关管Q5和Q6为IGBT(型号为CT60AM-20);二极管D5、D6、D7、和D8为DSEI130-06A;输出整流二极管DR1和DR2为MEK95-06DA;开关频率为fs=50kHZ。 A specific example of the present invention are as follows: the input AC voltage 380V / 50HZ AC is rectified filtered DC voltage is Vin = 530VDC; output DC voltage V0 = 54VDC; output current I0 = 50A; transformer primary and secondary turns ratio K = 7; output filter inductor Lf = 10μH; output filter capacitance Cf = 10000μF; junction capacitance of 2.2 uF Css; switch Q1-Q4 (which includes anti-parallel diodes D1-D4 and the junction capacitance C1-C4) is a MOSFET (model is IRF460); Q5 and Q6 of switch IGBT (model CT60AM-20); diodes D5, D6, D7, and D8 to DSEI130-06A; DR1 and DR2 output rectifier diode is MEK95-06DA; switching frequency fs = 50kHZ .

由以上描述可知,本发明提出的带钳位二极管的三电平零电压开关直流变换器具有如下优点:1、该变换器的一个桥臂为三电平桥臂,其开关管的电压应力为输入电压的一半,可在很宽的负载范围内实现零电压开关,因此可以选用MOSFET;2、另一个桥臂为两电平桥臂,由两个开关管组成,其开关管的电压应力为输入电压,可在很宽的负载范围内实现零电流开关,因此可以选用IGBT。 From the above description, three-level zero-voltage switching DC converter proposed by the present invention with the clamping diode has the following advantages: 1, a bridge arm of the converter is three-level bridge arm, the voltage stress of the switching tube is half of the input voltage, may be implemented in a very wide load range zero voltage switching, can be selected MOSFET; 2, the other is a two-arm bridge leg, composed of two switches, switch voltage stress which is input voltage, zero-current switching can be achieved over a wide load range, it is possible to choose IGBT.

3、该变换器输出整流电压波形的交流分量很小,因此可以大大减小输出滤波器,从而减小滤波器的体积和重量,并且改善变换器的动态特性。 3, the rectified AC component of the inverter output voltage waveform is small, the output filter can be greatly reduced, thereby reducing the weight and volume of the filter, and improve the dynamic characteristics of the inverters.

4、该变换器的输入电流脉动很小,因此可以减小输入滤波器。 4, the input ripple current of the converter is small, it is possible to reduce the input filter.

Claims (3)

1.一种零电压零电流开关混合型全桥三电平直流变换器包括输入分压电容电路、阻断电容电路、隔离变压器、整流滤波电路,其特征在于,还包括由三电平逆变桥臂和两电平逆变桥臂构成全桥式电路,即三电平逆变桥臂中的两只互相串联的开关管与两电平逆变桥臂中一桥臂的一只开关管构成一对桥臂,而三电平逆变桥臂中另一桥臂的两只相互串联的开关管与两电平逆变桥臂中的另一桥臂的一只开关管构成另一对桥臂,此桥式电路的输入端连于分压电容电路输出端,桥式电路的输出端通过阻断电容电路连于隔离变压器初级绕组。 A zero-voltage mixed zero-current switching full-bridge three-level converter includes an input capacitance voltage division circuit, a blocking capacitor circuit, an isolation transformer, rectifier and filter circuit, characterized by further comprising a three-level inverter arm and a two-level inverter bridge arm constituted full bridge circuit, i.e., a switch three-level inverter bridge arm of the two mutually series-connected switch and two-level inverter bridge arm of a bridge arm constitute a pair of arm, the other arm of the three-level inverter bridge arm to another arm of the two switch connected in series with the two-level inverter bridge arm of a further switch configuration bridge arm, an input terminal of this bridge circuit is connected to the output terminal of voltage dividing circuit capacitance, the output terminal of the bridge circuit through a blocking capacitor circuit connected to the primary winding of the isolation transformer.
2.依据权利要求1所述的零电压零电流开关混合型全桥三电平直流变换器,其特征在于,三电平逆变桥臂的组成是,四只开关管各自分别反向并联二极管和电容,在第二个开关管的阴极与第三个开关管的阳极之间分别并联互相串联的二个二极管和联结电容,其中二个二极管的串接点连于输入分压电容电路的两个电容的串接点。 2. Switch according ZVZCS hybrid full-bridge three-level DC converter according to claim 1, characterized in that the composition of the three-level inverter bridge arm is four switch antiparallel diode are each independently and a capacitor, connected in parallel between the anode the cathode of the second switch and the third switch are connected in series to each other and two coupling capacitance diode, wherein the diode is connected in series to the two points dividing the input circuit of two capacitors capacitors in series points.
3.依据权利要求1或2所述的零电压零电流开关混合型全桥三电平直流变换器,其特征在于,两电平逆变桥臂由两只开关管各自分别串联或并联一个二极管所组成。 3. The process according to claim zero current or zero voltage switching of the 1 hybrid full-bridge three-level DC converter, characterized in that the two-level inverter bridge arm is composed of two tubes each switching a diode in series or parallel, respectively, composed.
CN01127182A 2001-09-07 2001-09-07 Mixed bridge-type zero-voltage and zero-current switch three level DC converter CN1120561C (en)

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CN101494419B (en) 2008-01-21 2011-05-18 许继电源有限公司 High efficiency zero voltage, zero current whole bridge converter
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