CN204442168U - A kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter - Google Patents

A kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter Download PDF

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CN204442168U
CN204442168U CN201520139460.2U CN201520139460U CN204442168U CN 204442168 U CN204442168 U CN 204442168U CN 201520139460 U CN201520139460 U CN 201520139460U CN 204442168 U CN204442168 U CN 204442168U
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cuk
bridgeless
phase
isolated
diode
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周丽萍
丘东元
张祥
张波
肖文勋
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South China University of Technology SCUT
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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
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    • 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 e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

本实用新型提供一种基于无桥CUK隔离型三相功率因数校正变换器。本实用新型的变换器包括星形连接的三相交流电源、三个无桥CUK隔离型变换器、输出滤波电容和负载,三个无桥CUK隔离型变换器的输入端分别各自与三相交流电源的A相、B相、C相电压连接,三个所述无桥CUK隔离型变换器通过互连端相互连接;三个所述无桥CUK隔离型变换器的输出接输出滤波电容的两端,输出滤波电容的两端接负载。本实用新型具有升降压输出、实现功率因数校正的功能和输入与输出隔离,消除相与相耦合造成的环流。本实用新型电路参数设计简单,易于控制。

The utility model provides a bridgeless CUK-based isolated three-phase power factor correction converter. The converter of the present invention includes a star-connected three-phase AC power supply, three bridgeless CUK isolated converters, output filter capacitors and loads, and the input ends of the three bridgeless CUK isolated converters are respectively connected to the three-phase AC The A phase, B phase, and C phase voltage of the power supply are connected, and the three bridgeless CUK isolated converters are connected to each other through interconnection terminals; the outputs of the three bridgeless CUK isolated converters are connected to two terminals of the output filter capacitor. The two ends of the output filter capacitor are connected to the load. The utility model has the functions of step-down and step-down output, realization of power factor correction, isolation of input and output, and elimination of circulation caused by phase-to-phase coupling. The circuit parameters of the utility model are simple in design and easy to control.

Description

一种基于无桥CUK隔离型三相功率因数校正变换器An isolated three-phase power factor correction converter based on bridgeless CUK

技术领域technical field

本实用新型涉及三相交流电的功率因数校正领域,尤其涉及一种升降压和隔离输入输出的三相功率因数校正变换器。The utility model relates to the field of power factor correction of three-phase alternating current, in particular to a three-phase power factor correction converter for buck-boosting and isolation input and output.

背景技术Background technique

开关电源变换器的功率大于75W在接入电网前级加入功率因数校正变换器,从而减少谐波对电网的污染。在中、大功率(几千瓦以上)应用场合,一般情况下采用三相电源供电。采用传统的三相不控整流器整流会使输入电流产生畸变,谐波含量增加,威胁电网的安全运行。广泛应用的三相BOOST结构的PWM整流器输出电压高达500V以上,这对后级负载的电压应力要求很高,在要求低电压输出时,输出端加一级DC/DC变换器降压之后给最终的负载供电,这就增加了电源设计的成本和难度,降低整机效率。三相BUCK结构的PWM整流电路可以实现降压,但是不能实现升压,在要求高压输出时,输出端加DC/DC变换器,这就增加了电源设计的成本和难度,降低整机效率。无论是三相BOOST结构的PWM整流电路还是三相BUCK结构的PWM整流电路均不能够实现电气隔离。三相BUCK-BOOST PWM整流电路虽然能够实现升降压,但是不能够实现电气隔离,将后级负载的干扰传输到输入交流电源侧,加大了功率因数校正的难度。倘若直接用传统的三个单级非隔离型BOOST并联在三相上,则存在相与相之间的环流,影响到非隔离型BOOST变换器的工作。每相由非隔离型BOOST和后级隔离DC/DC变换器组成的双级结构并联成的三相功率因数校正变换器,虽然具有升降压和隔离的功能,但是由于需要设计两级电路,整机效率低,且每级电路都需要控制电路,这就增加了设计成本和难度。对于传统的CUK和SEPIC隔离型变换器也可以实现三相并联,但是由于前级一般采用不控二极管整流桥,每半个工频周期均有两个二极管导通且存在整流二极管的反向恢复问题,采用二极管不控整流桥与传统隔离型CUK和SEPIC变换器中开关管是硬开关开通,开关管的损耗大,这都降低了整机的工作效率。The power of the switching power supply converter is greater than 75W, and a power factor correction converter is added before it is connected to the grid, so as to reduce the pollution of harmonics to the grid. In medium and high power (above a few kilowatts) applications, a three-phase power supply is generally used for power supply. The use of traditional three-phase uncontrolled rectifiers will cause distortion of the input current and increase the harmonic content, threatening the safe operation of the power grid. The output voltage of the widely used three-phase BOOST PWM rectifier is as high as 500V, which requires a high voltage stress on the subsequent load. When low voltage output is required, a DC/DC converter is added to the output end to reduce the voltage to the final voltage. This increases the cost and difficulty of power supply design and reduces the efficiency of the whole machine. The PWM rectifier circuit of the three-phase BUCK structure can realize step-down, but cannot realize step-up. When high-voltage output is required, a DC/DC converter is added to the output, which increases the cost and difficulty of power supply design and reduces the efficiency of the whole machine. Neither the PWM rectifier circuit with the three-phase BOOST structure nor the PWM rectifier circuit with the three-phase BUCK structure can realize electrical isolation. Although the three-phase BUCK-BOOST PWM rectifier circuit can realize buck-boost, it cannot realize electrical isolation, and transmits the interference of the subsequent load to the input AC power side, which increases the difficulty of power factor correction. If three traditional single-stage non-isolated BOOSTs are directly connected in parallel to the three phases, there will be a circulating current between phases, which will affect the operation of the non-isolated BOOST converter. Each phase consists of a non-isolated BOOST and a post-stage isolated DC/DC converter in parallel to form a three-phase power factor correction converter. Although it has the functions of buck-boost and isolation, it needs to design a two-stage circuit. The efficiency of the whole machine is low, and each stage circuit needs a control circuit, which increases the design cost and difficulty. For the traditional CUK and SEPIC isolated converters, three-phase parallel connection can also be realized, but since the front stage generally uses an uncontrolled diode rectifier bridge, two diodes are turned on every half power frequency cycle and there is a reverse recovery of the rectifier diode The problem is that the diode uncontrolled rectifier bridge and the switch tube in the traditional isolated CUK and SEPIC converters are hard-switched, and the loss of the switch tube is large, which reduces the working efficiency of the whole machine.

实用新型内容Utility model content

本实用新型的目的在于克服上述现有技术的不足,提供一种基于无桥CUK隔离型三相功率因数校正变换器,具体技术方案如下。The purpose of this utility model is to overcome the shortcomings of the above-mentioned prior art and provide a bridgeless CUK-based isolated three-phase power factor correction converter. The specific technical solution is as follows.

一种基于无桥CUK隔离型三相功率因数校正变换器,其包括星形连接的三相交流电源、三个结构一样的无桥CUK隔离型变换器、输出滤波电容和负载,三个所述无桥CUK隔离型变换器的输入端分别各自与三相交流电源的A相、B相、C相电压连接,三个所述无桥CUK隔离型变换器通过互连端相互连接;三个所述无桥CUK隔离型变换器的输出端接输出滤波电容的两端,输出滤波电容的两端接负载。A bridgeless CUK isolated three-phase power factor correction converter, which includes a star-connected three-phase AC power supply, three bridgeless CUK isolated converters with the same structure, an output filter capacitor and a load, the three described The input ends of the bridgeless CUK isolated converters are respectively connected to the A-phase, B-phase, and C-phase voltages of the three-phase AC power supply, and the three bridgeless CUK isolated converters are connected to each other through interconnection terminals; The output terminal of the bridgeless CUK isolated converter is connected to the two ends of the output filter capacitor, and the two ends of the output filter capacitor are connected to the load.

进一步地,所述三个结构一样的无桥CUK隔离型变换器中,每个无桥CUK隔离型变换器包括包括输入电感、第一原边二极管和第二原边二极管、第一开关管和第二开关管、原边电容、高频变压器、副边电容、副边二极管和副边电感组成,其中输入电感的一端作为无桥CUK隔离型变换器的输入端,输入电感的另一端接第一原边二极管的阳极和第二原边二极管的阴极,第一原边二极管的另一端与第一开关管源极和原边电容的一端连接;第一开关管的漏极与第二开关管的源极连接,并在连接点处引出一端作为互联端,与另外的变换器相连;原边电容的另一端与高频变压器的原边同名端连接;第二原边二极管的阳极与第二开关管的漏极和高频变压器的原边非同名端连接;高频变压器的副边非同名端与副边电容的一端相连;副边电容的另一端与副边二极管的阴极和副边电感的一端相连接;副边电感的另一端作为输出端的正极端,并与输出滤波电容和负载正极端相连接;高频变压器的副边同名端与副边二极管的阳极连接,并在此连接点处引出一端作为输出端的共地端。Further, among the three bridgeless CUK isolated converters with the same structure, each bridgeless CUK isolated converter includes an input inductor, a first primary diode and a second primary diode, a first switch tube and The second switching tube, primary side capacitor, high frequency transformer, secondary side capacitor, secondary side diode and secondary side inductance are composed of one end of the input inductance as the input end of the bridgeless CUK isolated converter, and the other end of the input inductance is connected to the first The anode of a primary side diode and the cathode of the second primary side diode, the other end of the first primary side diode is connected to the source of the first switch tube and one end of the primary side capacitor; the drain of the first switch tube is connected to the second switch tube The source of the high-frequency transformer is connected, and one end is drawn out at the connection point as an interconnection end to connect to another converter; the other end of the primary side capacitor is connected to the same name end of the primary side of the high-frequency transformer; the anode of the second primary side diode is connected to the second The drain of the switch tube is connected to the non-identical end of the primary side of the high-frequency transformer; the non-identical end of the secondary side of the high-frequency transformer is connected to one end of the secondary capacitor; the other end of the secondary capacitor is connected to the cathode of the secondary diode and the secondary inductance The other end of the secondary inductance is used as the positive terminal of the output terminal, and is connected to the output filter capacitor and the positive terminal of the load; the same name terminal of the secondary side of the high frequency transformer is connected to the anode of the secondary diode, and at this connection One end is drawn out as the common ground end of the output end.

进一步地,三个无桥CUK隔离型变换器中的每个变换器具有单独的控制器或由同一控制器同时控制。Further, each of the three bridgeless CUK isolated converters has a separate controller or is controlled simultaneously by the same controller.

进一步地,负载为纯电阻性负载、阻感性负载、阻容性负载或开关变换器。Further, the load is a pure resistive load, a resistive-inductive load, a resistive-capacitive load or a switching converter.

进一步地,所有二极管为普通二极管、功率二极管、晶闸管或全控型开关管。Further, all the diodes are ordinary diodes, power diodes, thyristors or full-control switch tubes.

进一步地,所有开关管为MOSFET、带有寄生反并联二极管IGBT或反并联二极管的单向导通的开关管。Further, all the switch tubes are MOSFETs, IGBTs with parasitic anti-parallel diodes or unidirectional conduction switch tubes with anti-parallel diodes.

与现有的技术相比较,本实用新型具有的优势为:实现接近于1的功率因数,实现输入电压的升降压,满足后级负载的多种电气要求,输入交流电源侧与输出负载端的电气隔离。当三个变换器均工作在断续模式下时,本实用新型只需要一个电压环就可以控制三个隔离变换器,即可实现功率因数校正。这相对于传统的BOOST PWM整流电路,控制方法很简单。前级采用的两个开关管代替了整流桥中的二极管,在输入电源的正半周,每个变换器的上开关管S1_i(i=1,2,3)实现零电流开通,下开关管S2_i(i=1,2,3)实现零电压开通,整机的效率较高。本实用新型提出的一种基于无桥CUK隔离型三相功率因数校正变换器中的三个变换器结构一样,参数一样,且减少了整机的设计难度和成本,在工业化流水线生产中具有很大的优势。Compared with the existing technology, the utility model has the advantages of: realizing a power factor close to 1, realizing the step-down and step-down of the input voltage, meeting various electrical requirements of the subsequent load, and the connection between the input AC power supply side and the output load end. electrical isolation. When the three converters all work in the discontinuous mode, the utility model only needs one voltage loop to control the three isolated converters and realize power factor correction. Compared with the traditional BOOST PWM rectifier circuit, the control method is very simple. The two switching tubes used in the previous stage replace the diodes in the rectifier bridge. In the positive half cycle of the input power supply, the upper switching tube S 1_i (i=1,2,3) of each converter realizes zero current turn-on, and the lower switching tube S 2_i (i=1, 2, 3) realizes zero-voltage turn-on, and the efficiency of the whole machine is relatively high. The three converters in the bridgeless CUK isolated three-phase power factor correction converter proposed by the utility model have the same structure and the same parameters, and reduce the design difficulty and cost of the whole machine, and have great advantages in industrial assembly line production. big advantage.

附图说明Description of drawings

图1为一种基于无桥CUK隔离型三相功率因数校正变换器的结构图。Figure 1 is a structural diagram of a bridgeless CUK isolated three-phase power factor correction converter.

图2为一个工频周期的三相交流电波形图。Figure 2 is a three-phase AC waveform diagram of a power frequency cycle.

图3为六个开关管同时导通时三相功率因数校正变换器工作原理图。Fig. 3 is a working principle diagram of a three-phase power factor correction converter when six switching tubes are turned on at the same time.

图4为六个开关管关断,副边二极管ID3_i(i=1,2,3)都不为零时变换器的工作原理图。Fig. 4 is a working schematic diagram of the converter when the six switching tubes are turned off and the secondary diodes ID3_i (i=1, 2, 3) are all zero.

图5为六个开关管关断,副边二极管电流ID3_i(i=1,3)不为零,ID3_2为零时变换器的工作原理图。Fig. 5 is a working schematic diagram of the converter when the six switch tubes are turned off, the secondary diode current ID3_i (i=1, 3) is not zero, and ID3_2 is zero.

图6为六个开关管关断,副边二极管电流ID3_3不为零,ID3_i(i=1,2)为零时变换器的工作原理图。Fig. 6 is a working schematic diagram of the converter when the six switch tubes are turned off, the secondary diode current ID3_3 is not zero, and ID3_i (i=1, 2) is zero.

图7为六个开关管关断,副边二极管ID3_i(i=1,2,3)都为零时变换器的工作原理图。Fig. 7 is a working schematic diagram of the converter when the six switching tubes are turned off and the secondary diodes ID3_i (i=1, 2, 3) are all zero.

图8为本实用新型实施例设计为400V时的输入电感电流和输出电压波形。Fig. 8 shows the input inductor current and output voltage waveforms when the design of the embodiment of the utility model is 400V.

图9为无桥CUK隔离型变换器(3)的上下两个开关管的电压和电流放大150倍波形。Fig. 9 is a 150-times enlarged waveform of the voltage and current of the upper and lower switch tubes of the bridgeless CUK isolated converter (3).

图10为每个输入电感电流和对应的交流相电压波形。Figure 10 shows each input inductor current and the corresponding AC phase voltage waveform.

图11为截取模态5的一小段对应的三相交流电压波形和三个副边二极管电流波形。Fig. 11 shows a short segment of the corresponding three-phase AC voltage waveform and three secondary diode current waveforms of the intercept mode 5.

具体实施方式Detailed ways

为进一步阐述本实用新型的内容和特点,以下结合附图对本实用新型的具体实施方案进行具体说明,但本实用新型的实施和保护不限于此,以下若有未特别详细说明之处,均是本领域技术人员可采用现有技术实现的。In order to further illustrate the content and characteristics of the present utility model, the specific embodiments of the present utility model are described in detail below in conjunction with the accompanying drawings, but the implementation and protection of the present utility model are not limited thereto. Those skilled in the art can use existing technology to realize.

本实用新型的基本拓扑结构如图1所示,作为实施例提供一种基于无桥CUK隔离型三相功率因数校正变换器,包括星形连接的三相交流电源、三个结构一样的无桥CUK隔离型变换器、输出滤波电容和负载。第i(i=1,2,3)个无桥CUK隔离型变换器由输入电感L1_i、原边二极管D1_i和D2_i、开关管S1_i和S2_i、原边电容C1_i、高频变压器Ti、副边电容C2_i、副边二极管D3_i和副边电感L2_i组成。所有的二极管可以是普通二极管、功率二极管和晶闸管和全控型开关管,所有的开关管可以是MOSFET和单向导通的开关并联二极管。A相电压通过输入电感L1_1接到原边二极管D1_1阳极和原边二极管D2_1阴极连接的节点,B相电压通过输入电感L1_2接到原边二极管D1_2阳极和原边二极管D2_2阴极连接的节点,C相电压通过输入电感L1_3接到原边二极管D1_3阳极和原边二极管D2_3阴极连接的节点。第一无桥CUK隔离型变换器1的开关管S1_1和开关管S2_1之间的节点、第二无桥CUK隔离型变换器2的开关管S1_2和开关管S2_2之间的节点和第三无桥CUK隔离型变换器3的开关管S1_3和开关管S2_3之间的节点相互连接。高频变压器Ti(i=1,2,3)的原边绕组的同名端分别连接在原边电容C1_i(i=1,2,3),副边绕组的异名端连接在副边电容C2_i(i=1,2,3)的一端。The basic topology of the utility model is shown in Figure 1. As an embodiment, a bridgeless CUK-based isolated three-phase power factor correction converter is provided, including a star-connected three-phase AC power supply and three bridgeless bridges with the same structure. CUK isolated converter, output filter capacitor and load. The i-th (i=1,2,3) bridgeless CUK isolated converter consists of input inductor L 1_i , primary side diodes D 1_i and D 2_i , switch tubes S 1_i and S 2_i , primary side capacitor C 1_i , high frequency The transformer T i , the secondary capacitor C 2_i , the secondary diode D 3_i and the secondary inductor L 2_i are composed. All the diodes can be ordinary diodes, power diodes, thyristors and full-control switch tubes, and all switch tubes can be MOSFETs and unidirectional switch parallel diodes. The phase A voltage is connected to the node where the anode of the primary diode D 1_1 and the cathode of the primary diode D 2_1 are connected through the input inductor L 1_1 , and the phase B voltage is connected to the anode of the primary diode D 1_2 and the cathode of the primary diode D 2_2 through the input inductor L 1_2 The node connected, the phase C voltage is connected to the node where the anode of the primary diode D 1_3 and the cathode of the primary diode D 2_3 are connected through the input inductor L 1_3 . The node between the switch tube S 1_1 and the switch tube S 2_1 of the first bridgeless CUK isolated converter 1, the node between the switch tube S 1_2 and the switch tube S 2_2 of the second bridgeless CUK isolated converter 2 and Nodes between the switch tube S 1_3 and the switch tube S 2_3 of the third bridgeless CUK isolated converter 3 are connected to each other. The same-named ends of the primary winding of the high-frequency transformer T i (i=1,2,3) are respectively connected to the primary capacitor C 1_i (i=1,2,3), and the different-named ends of the secondary winding are connected to the secondary capacitor One end of C 2_i (i=1,2,3).

原边电容C1_i和副边电容C2_i(i=1,2,3)都是无极性电容。副边电感L2_i(i=1,2,3)一端连接副边电容C2_i(i=1,2,3),一端相互连接在一起之后接到滤波电容和负载。滤波电容Cout是大容量的电容。负载可以是纯电阻负载、阻感性负载、容性负载和开关变换器。本实用新型实施例中每个无桥CUK隔离型变换器工作在断续模式状态下,采用一个电压环控制器控制三个无桥CUK隔离型变换器。The primary capacitor C 1_i and the secondary capacitor C 2_i (i=1, 2, 3) are both non-polar capacitors. One end of the secondary inductor L 2_i (i=1,2,3) is connected to the secondary capacitor C 2_i (i=1,2,3), and the other end is connected to each other and then connected to the filter capacitor and the load. The filter capacitor C out is a large-capacity capacitor. Loads can be purely resistive loads, resistive inductive loads, capacitive loads and switching converters. In the embodiment of the utility model, each bridgeless CUK isolated converter works in a discontinuous mode, and one voltage loop controller is used to control three bridgeless CUK isolated converters.

如附录图2所示,根据一个工频周期三相交流电源A相、B相和C相电压的幅值和正负分成12个模态,每个模态所有开关管的开关动作一致。每个模态变换器的工作原理分析方法类似,下面以第5个模态为例分析本实用新型实施例的工作原理。如附录图2所示,在第5个模态,A相电压ua>0,B相电压ub>0,C相电压uc<0,A相、B相和C相电压的幅值关系是|uc|>|ua|>|ub|。As shown in Figure 2 in the appendix, according to the amplitude and positive and negative of the A-phase, B-phase, and C-phase voltages of a three-phase AC power supply in a power frequency cycle, it is divided into 12 modes, and the switching actions of all switching tubes in each mode are consistent. The analysis method of the working principle of each mode converter is similar, and the working principle of the embodiment of the present invention will be analyzed below taking the fifth mode as an example. As shown in Figure 2 of the appendix, in the fifth mode, phase A voltage u a >0, phase B voltage u b >0, phase C voltage u c <0, the amplitudes of phase A, phase B and phase C voltages The relationship is |u c | > |u a | > |u b |.

输入电感电流用IL1_i(i=1,2,3)表示,原边电容电压用VC1_i(i=1,2,3)表示,高频变压器原边电压用VP_i(i=1,2,3),高频变压器副边电压用VS_i(i=1,2,3)表示,副边电容电压用VC2_i(i=1,2,3)表示,副边电感电流用IL2_i(i=1,2,3)表示,副边二极管电流用ID3_i(i=1,2,3)表示。所有电压电流变量的参考方向如附录图1所示。The input inductor current is represented by I L1_i (i=1,2,3), the primary capacitor voltage is represented by V C1_i (i=1,2,3), and the primary voltage of the high-frequency transformer is represented by V P_i (i=1,2 ,3), the high-frequency transformer secondary voltage is represented by V S_i (i=1,2,3), the secondary capacitor voltage is represented by V C2_i (i=1,2,3), and the secondary inductor current is represented by I L2_i ( i = 1, 2, 3), and the secondary diode current is represented by I D3_i (i = 1, 2, 3). The reference directions of all voltage and current variables are shown in Figure 1 in the appendix.

六个开关管同时导通,本实用新型实施例变换器工作原理图如附录图3所示输入电压通过开关管给输入电感充电。原边电容C1_i(i=1,2,3)通过开关管S1_i(i=1,2,3)和S2_i(i=1,2,3),再经过高频变压器Ti(i=1,2,3)原边非同名端给励磁电感充电,所以高频变压器Ti(i=1,2,3)的原边电压VP_i(i=1,2,3)为负值,感应到高频变压器Ti(i=1,2,3)的副边电压VS_i(i=1,2,3)大于零,副边二极管D3_i(i=1,2,3)承受反向电压而截止,副边二极管电流ID3_i(i=1,2,3)为零,副边电容通过副边电感电流IL2_i(i=1,2,3)给负载供电。The six switch tubes are turned on at the same time, and the working principle diagram of the converter of the embodiment of the utility model is shown in Fig. 3 in the appendix. The input voltage charges the input inductance through the switch tubes. The primary capacitance C 1_i (i=1,2,3) passes through the switch tubes S 1_i (i=1,2,3) and S 2_i (i=1,2,3), and then passes through the high-frequency transformer T i (i =1,2,3) The non-identical end of the primary side charges the excitation inductance, so the primary side voltage V P_i (i=1,2,3) of the high-frequency transformer T i (i=1,2,3) is a negative value , the secondary voltage V S_i (i=1,2,3) of the high-frequency transformer T i (i=1,2,3) is induced to be greater than zero, and the secondary diode D 3_i (i=1,2,3) bears The secondary side diode current I D3_i (i=1,2,3) is zero, and the secondary side capacitor supplies power to the load through the secondary side inductor current I L2_i (i=1,2,3).

六个开关管同时关断后,副边二极管电流ID3_i(i=1,2,3)都不等于零时,本实用新型实施例变换器工作原理图如附录图4所示。在高频变压器的原边,输入电感L1_1和L1_2的电流IL1_i(i=1,2)通过原边二极管D1_i(i=1,2)、原边电容C1_i(i=1,2)、高频变压器Ti(i=1,2)的原边同名端和开关管S2_i(i=1,2)续流二极管顺序流入开关管的S1_3的续流二极管、原边电容C1_3、高频变压器T3的原边同名端和原边二极管D2_3回到输入电感L1_3和C相电压。因此输入电感电流IL1_1和IL1_2之和等于IL1_3,输入电感L1_1和L1_2由于承受正电压,所以其电流为IL1_1和IL1_2正值,即与参考方向一致,输入电感L1_3由于承受负电压,所以其电流为IL1_3负值,即与参考方向相反。在高频变压器的副边,高频变压器的副边电压VS_i(i=1,2,3)大于零,副边二极管D3_i(i=1,2,3)承受正向电压而截止,副边二极管电流ID3_i(i=1,2,3)不为零,但是由于A相、B相和C相电压的幅值关系是|uc|>|ua|>|ub|,因此ID3_2、ID3_1和ID3_3是依次减少到零的,最后三者同时为零。对应的工作原理如附录图5、6和7所示。ID3_2、ID3_1和ID3_3为零之后,重新开始在模态5内下一个开关周期的工作过程。After the six switching tubes are turned off at the same time, when the secondary diode current I D3_i (i=1, 2, 3) is not equal to zero, the working principle diagram of the converter of the embodiment of the utility model is shown in Fig. 4 in the appendix. On the primary side of the high-frequency transformer, the current I L1_i (i=1,2) of the input inductors L 1_1 and L 1_2 passes through the primary diode D 1_i (i=1,2), the primary capacitor C 1_i (i=1, 2), the high-frequency transformer T i (i=1,2) primary terminal with the same name and the switch tube S 2_i (i=1,2) freewheeling diode sequentially flow into the switch tube S 1_3 freewheeling diode, primary capacitor C 1_3 , the same-named terminal of the primary side of the high-frequency transformer T 3 and the primary side diode D 2_3 are returned to the input inductor L 1_3 and the C-phase voltage. Therefore, the sum of the input inductor currents I L1_1 and I L1_2 is equal to I L1_3 , and the input inductors L 1_1 and L 1_2 are subjected to positive voltages, so the current is a positive value of I L1_1 and I L1_2 , which is consistent with the reference direction, and the input inductor L 1_3 is due to Withstand negative voltage, so its current is I L1_3 negative, that is, opposite to the reference direction. On the secondary side of the high-frequency transformer, the secondary voltage V S_i (i=1,2,3) of the high-frequency transformer is greater than zero, and the secondary diode D 3_i (i=1,2,3) is cut off due to forward voltage. The secondary diode current I D3_i (i=1, 2, 3) is not zero, but because the amplitude relationship of the A-phase, B-phase and C-phase voltages is |u c |>|u a |>|u b |, Therefore ID3_2 , ID3_1 and ID3_3 decrease to zero in turn, and the last three are zero at the same time. The corresponding working principles are shown in Figures 5, 6 and 7 in the appendix. After ID3_2 , ID3_1 and ID3_3 are zero, the working process of the next switching cycle in mode 5 is restarted.

下面对本实用新型实施进行仿真验证。每个模块的输出功率是200W,总的输出功率为600W。设计参数如下:Carry out simulation verification to the implementation of the utility model below. The output power of each module is 200W, and the total output power is 600W. The design parameters are as follows:

输出功率:Po=200W*3Output power: P o =200W*3

输入电压:220V/50HzInput voltage: 220V/50Hz

效率:η=95%Efficiency: η=95%

功率因数:PF=0.99Power factor: PF=0.99

总谐波含量:THD≤5%Total harmonic content: THD≤5%

输出电压:400VOutput voltage: 400V

根据以上参数设计主电路和控制电路,对本实用新型实施例进行了仿真。仿真结果如附录图8、9、10和11所示。由于输入电感分别与三相电源串联,因此输入电感电流也就是三相电源的输入电流,如附录图8所示,输入电感电流IL1_1、IL1_2和IL1_3的波形成正弦规律变化,且在仿真软件中测量输入电感电流IL1_1、IL1_2和IL1_3的总谐波含量THD值分别为2.947%、2.950%和2.947%,均远小于国内标准规定10%。输出电压稳在400V。如附录图9所示,无桥CUK隔离型变换器(3)上开关管实现零电流开通,下开关管实现零电压开通。图9中电流放大150倍。附录图10给出了每一相电压和对应的输入电感电流的波形,输入电感L1_1的电流IL1_1和A相电压ua、输入电感L1_2的电流IL1_2和B相电压和输入电感L1_3的电流IL1_3和C相电压功率因数均为0.999。附录图11是截取仿真结果中模态5的两个半开关周期,A相电压ua>0,B相电压ub>0,C相电压uc<0,A相、B相和C相电压的幅值关系是|uc|>|ua|>|ub|,从附录图11中可以看到ID3_2、ID3_1和ID3_3是依次减少到零,最后三者同时为零。所有仿真结果都充分验证了本实用新型在只有一个电压环控制下,可实现功率因数校正。The main circuit and the control circuit are designed according to the above parameters, and the embodiment of the utility model is simulated. The simulation results are shown in Figures 8, 9, 10 and 11 in the appendix. Since the input inductors are connected in series with the three-phase power supply, the input inductor current is also the input current of the three-phase power supply. As shown in Figure 8 in the appendix, the waves of the input inductor currents I L1_1 , I L1_2 and I L1_3 form sinusoidal changes, and in The total harmonic content THD values of the input inductor currents I L1_1 , I L1_2 and I L1_3 measured in the simulation software are 2.947%, 2.950% and 2.947%, respectively, which are far less than the 10% specified in the domestic standard. The output voltage is stable at 400V. As shown in Fig. 9 in the appendix, the upper switch tube of the bridgeless CUK isolated converter (3) realizes zero-current turn-on, and the lower switch tube realizes zero-voltage turn-on. In Figure 9, the current is magnified 150 times. Appendix Figure 10 shows the waveforms of each phase voltage and the corresponding input inductor current, the current I L1_1 of the input inductor L 1_1 and the voltage u a of phase A, the current I L1_2 of the input inductor L 1_2 and the voltage of phase B and the input inductor L The current I L1_3 of 1_3 and the power factor of the C-phase voltage are both 0.999. Figure 11 in the appendix is the two and a half switching cycles of mode 5 in the intercepted simulation results, phase A voltage u a >0, phase B voltage u b >0, phase C voltage u c <0, phase A, phase B and phase C The amplitude relationship of the voltage is |u c |>|u a |>|u b |. It can be seen from Figure 11 in the appendix that ID3_2 , ID3_1 and ID3_3 decrease to zero in turn, and the last three are zero at the same time. All simulation results have fully verified that the utility model can realize power factor correction under the control of only one voltage loop.

Claims (6)

1.一种基于无桥CUK隔离型三相功率因数校正变换器,其特征在于包括星形连接的三相交流电源(4)、三个结构一样的无桥CUK隔离型变换器(1、2和3)、输出滤波电容(Cout)和负载(Rlaod),三个所述无桥CUK隔离型变换器(1、2和3)的输入端分别各自与三相交流电源(4)的A相、B相、C相电压连接,三个所述无桥CUK隔离型变换器(1、2和3)通过互连端相互连接;三个所述无桥CUK隔离型变换器(1、2和3)的输出端接输出滤波电容(Cout)的两端,输出滤波电容(Cout)的两端接负载(Rlaod)。1. A bridgeless CUK isolated three-phase power factor correction converter is characterized in that comprising star-connected three-phase AC power supply (4), three structurally identical bridgeless CUK isolated converters (1, 2 and 3), the output filter capacitor (C out ) and the load (R laod ), the input terminals of the three bridgeless CUK isolated converters (1, 2 and 3) are connected to the three-phase AC power supply (4) respectively Phase A, phase B, and phase C are voltage-connected, and the three bridgeless CUK isolated converters (1, 2 and 3) are connected to each other through interconnection terminals; the three bridgeless CUK isolated converters (1, The output terminals of 2 and 3) are connected to both ends of the output filter capacitor (C out ), and both ends of the output filter capacitor (C out ) are connected to the load (R laod ). 2.根据权利要求1所述的一种基于无桥CUK隔离型三相功率因数校正变换器,其特征在于三个结构一样的无桥CUK隔离型变换器中,每个无桥CUK隔离型变换器包括输入电感、第一原边二极管和第二原边二极管、第一开关管和第二开关管、原边电容、高频变压器、副边电容、副边二极管和副边电感组成,其中输入电感的一端作为无桥CUK隔离型变换器的输入端,输入电感的另一端接第一原边二极管的阳极和第二原边二极管的阴极,第一原边二极管的另一端与第一开关管源极和原边电容的一端连接;第一开关管的漏极与第二开关管的源极连接,并在连接点处引出一端作为互联端,与另外的变换器相连;原边电容的另一端与高频变压器的原边同名端连接;第二原边二极管的阳极与第二开关管的漏极和高频变压器的原边非同名端连接;高频变压器的副边非同名端与副边电容的一端相连;副边电容的另一端与副边二极管的阴极和副边电感的一端相连接;副边电感的另一端作为输出端的正极端,并与输出滤波电容(Cout)和负载(Rlaod)正极端相连接;高频变压器的副边同名端与副边二极管的阳极连接,并在此连接点处引出一端作为输出端的共地端。2. A kind of bridgeless CUK isolated three-phase power factor correction converter based on claim 1, characterized in that in three bridgeless CUK isolated converters with the same structure, each bridgeless CUK isolated converter The device consists of an input inductor, a first primary diode and a second primary diode, a first switch tube and a second switch tube, a primary capacitor, a high-frequency transformer, a secondary capacitor, a secondary diode and a secondary inductor, where the input One end of the inductor is used as the input end of the bridgeless CUK isolated converter, the other end of the input inductor is connected to the anode of the first primary diode and the cathode of the second primary diode, and the other end of the first primary diode is connected to the first switch tube The source is connected to one end of the primary side capacitor; the drain of the first switch tube is connected to the source of the second switch tube, and one end is drawn out at the connection point as an interconnection terminal to be connected to another converter; the other end of the primary side capacitor One end is connected to the primary end of the high-frequency transformer with the same name; the anode of the second primary diode is connected to the drain of the second switching tube and the primary end of the high-frequency transformer with the same name; the secondary end of the high-frequency transformer with the same name is connected to the secondary One end of the side capacitor is connected; the other end of the secondary capacitor is connected to the cathode of the secondary diode and one end of the secondary inductor; the other end of the secondary inductor is used as the positive terminal of the output terminal, and is connected to the output filter capacitor (C out ) and the load (R laod ) positive terminals are connected; the same-named terminal of the secondary side of the high-frequency transformer is connected to the anode of the secondary diode, and one terminal is drawn out at this connection point as the common ground terminal of the output terminal. 3.根据权利要求1所述的一种基于无桥CUK隔离型三相功率因数校正变换器,其特征在于三个无桥CUK隔离型变换器中的每个变换器具有单独的控制器或由同一控制器同时控制。3. A kind of bridgeless CUK isolated three-phase power factor correction converter based on claim 1, characterized in that each converter in the three bridgeless CUK isolated converters has a separate controller or is controlled by Simultaneous control by the same controller. 4.根据权利要求1所述的一种基于无桥CUK隔离型三相功率因数校正变换器,其特征在于负载为纯电阻性负载、阻感性负载、阻容性负载或开关变换器。4. A bridgeless CUK-based isolated three-phase power factor correction converter according to claim 1, characterized in that the load is a purely resistive load, a resistive-inductive load, a resistive-capacitive load or a switching converter. 5.根据权利要求2所述的一种基于无桥CUK隔离型三相功率因数校正变换器,其特征在于所有二极管为普通二极管、功率二极管、晶闸管或全控型开关管。5. A bridgeless CUK-based isolated three-phase power factor correction converter according to claim 2, characterized in that all diodes are ordinary diodes, power diodes, thyristors or full-control switches. 6.根据权利要求2所述的一种基于无桥CUK隔离型三相功率因数校正变换器,其特征在于所有开关管为MOSFET、带有寄生反并联二极管IGBT或反并联二极管的单向导通的开关管。6. A kind of isolated three-phase power factor correction converter based on bridgeless CUK according to claim 2, characterized in that all switching tubes are MOSFETs, unidirectional conduction with parasitic anti-parallel diode IGBT or anti-parallel diode turning tube.
CN201520139460.2U 2015-03-12 2015-03-12 A kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter Expired - Fee Related CN204442168U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104967304A (en) * 2015-03-12 2015-10-07 华南理工大学 An isolated three-phase power factor correction converter based on bridgeless CUK
CN109104092A (en) * 2018-09-28 2018-12-28 南京理工大学 Low switch tube voltage stress current type export resonance converter
CN115053440A (en) * 2019-12-24 2022-09-13 苏迪普.K.马祖姆德 Solid state power conversion system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104967304A (en) * 2015-03-12 2015-10-07 华南理工大学 An isolated three-phase power factor correction converter based on bridgeless CUK
CN104967304B (en) * 2015-03-12 2018-04-13 华南理工大学 One kind is based on no bridge CUK isolated form Three Phase Power Factor Correction Converters
CN109104092A (en) * 2018-09-28 2018-12-28 南京理工大学 Low switch tube voltage stress current type export resonance converter
CN109104092B (en) * 2018-09-28 2020-04-14 南京理工大学 Low Switch Voltage Stress Current Mode Output Resonant Converter
CN115053440A (en) * 2019-12-24 2022-09-13 苏迪普.K.马祖姆德 Solid state power conversion system

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