CN111446854B - Extensible Zeta DC-DC converter - Google Patents

Extensible Zeta DC-DC converter Download PDF

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CN111446854B
CN111446854B CN202010364925.XA CN202010364925A CN111446854B CN 111446854 B CN111446854 B CN 111446854B CN 202010364925 A CN202010364925 A CN 202010364925A CN 111446854 B CN111446854 B CN 111446854B
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capacitor
basic
converter
diode
inductor
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CN111446854A (en
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邾玢鑫
刘光辉
张耀
佘小莉
陈世环
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China Three Gorges University CTGU
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/08—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies 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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  • Power Engineering (AREA)
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Abstract

一种可扩展Zeta DC‑DC变换器，该变换器包括：一个输入电源，一个负载R L，一个基本Zeta DC‑DC变换器，n个基础单元；所述基本Zeta DC‑DC变换器包括：两个电感L 1、L 2，两个电容C 1、C 2，一个功率开关S1，一个二极管D1。相比于传统Zeta DC‑DC变换器，本发明变换器具有：输入输出电压调节范围宽、开关器件电压应力低等优势，适用于输入或输出电压变化范围较宽的应用场合。

Figure 202010364925

A scalable Zeta DC-DC converter, the converter includes: an input power supply, a load RL , a basic Zeta DC-DC converter, n basic units; the basic Zeta DC-DC converter includes: Two inductors L 1 , L 2 , two capacitors C 1 , C 2 , one power switch S 1 , and one diode D 1 . Compared with the traditional Zeta DC-DC converter, the converter of the present invention has the advantages of wide adjustment range of input and output voltages, low voltage stress of switching devices, etc., and is suitable for applications with a wide range of input or output voltage variations.

Figure 202010364925

Description

一种可扩展Zeta DC-DC变换器A Scalable Zeta DC-DC Converter

技术领域Technical Field

本发明涉及一种宽输入输出升降压DC/DC变换器，具体是一种新型可扩展ZetaDC-DC变换器。The invention relates to a wide input-output buck-boost DC/DC converter, in particular to a novel expandable ZetaDC-DC converter.

背景技术Background Art

目前文献中，提高DC-DC变换器输入输出增益的关键器件或方案可以分为隔离型，级联型、耦合电感型、开关电容型、电压增益单元型或多种方式组合型。但上述方案大多是基于Boost变换器展开，因而只具备高升压能力，不具备降压能力，且部分方案存在输入输出变比必须大于2的情况。所以，在一些电压变化范围较大的场合，特别是有时需要实现降压的场合中，上述方案难以适用。In the current literature, the key components or solutions for improving the input and output gain of DC-DC converters can be divided into isolation type, cascade type, coupled inductor type, switch capacitor type, voltage gain unit type or a combination of multiple methods. However, most of the above solutions are based on Boost converters, so they only have high voltage boost capability but not voltage reduction capability, and some solutions have the situation where the input-output ratio must be greater than 2. Therefore, in some occasions where the voltage variation range is large, especially in occasions where voltage reduction is sometimes required, the above solutions are difficult to apply.

传统的非隔离型升降压DC-DC变换器有Buck-Boost、Cuk、SEPIC和Zeta电路。理论上通过调节占空比D，这些变换器的输入输出增益可以在零至无穷大之间变化，输入输出电压转换比可以做到较宽的调节范围。但在实际工况下，当这些变换器工作于升压模式时，特别是当占空比接近1时，受电路和元器件寄生参数的影响，输入输出增益比不升反降，输入输出增益比调节范围受到极大的限制。因此，在现有升降压DC-DC变换器的基础上研究既可实现高增益升压，同时又保留降压能力的新型宽输入输出升降压DC/DC变换器具有重要意义。Traditional non-isolated buck-boost DC-DC converters include Buck-Boost, Cuk, SEPIC and Zeta circuits. Theoretically, by adjusting the duty cycle D, the input-output gain of these converters can vary between zero and infinity, and the input-output voltage conversion ratio can achieve a wider adjustment range. However, under actual working conditions, when these converters work in boost mode, especially when the duty cycle is close to 1, the input-output gain ratio decreases instead of increases due to the influence of circuit and component parasitic parameters, and the input-output gain ratio adjustment range is greatly limited. Therefore, it is of great significance to study a new wide input-output buck-boost DC/DC converter that can achieve high-gain boost while retaining the buck capability based on the existing buck-boost DC-DC converter.

发明内容Summary of the invention

为解决现有非隔离型高增益DC-DC变换器在宽输入输出电压应用场合中的局限性问题。本发明在传统Zeta DC-DC变换器引入与之相适应的“外衣电路”，提出一种新型可扩展Zeta DC-DC变换器，相比于传统Zeta DC-DC变换器，本发明变换器具有：输入输出电压调节范围宽、开关器件电压应力低等优势，适用于输入或输出电压变化范围较宽的应用场合。In order to solve the limitation problem of existing non-isolated high-gain DC-DC converters in wide input and output voltage applications, the present invention introduces a corresponding "outer circuit" into the traditional Zeta DC-DC converter, and proposes a new expandable Zeta DC-DC converter. Compared with the traditional Zeta DC-DC converter, the converter of the present invention has the advantages of wide input and output voltage adjustment range, low voltage stress of switching devices, etc., and is suitable for applications with a wide input or output voltage variation range.

本发明采取的技术方案为：The technical solution adopted by the present invention is:

一种新型可扩展Zeta DC-DC变换器，该变换器包括：A novel scalable Zeta DC-DC converter, comprising:

一个输入电源，一个负载RL，一个基本Zeta DC-DC变换器，n个基础单元；One input power source, one load R L , one basic Zeta DC-DC converter, n basic units;

所述基本Zeta DC-DC变换器包括：两个电感L1、L2，两个电容C1、C2，一个功率开关S1，一个二极管D1；其连接形式如下：The basic Zeta DC-DC converter includes: two inductors L 1 , L 2 , two capacitors C 1 , C 2 , a power switch S 1 , and a diode D 1 ; the connection form thereof is as follows:

功率开关S1的漏极连接输入电源的正极，功率开关S1的源极分别连接电感L1的一端、电容C1的一端，电容C1的另一端分别与电感L2的一端、二极管D1的阴极相连，电感L2的另一端与电容C2的一端相连，电感L1的另一端、二极管D1的阳极、以及电容C2的另一端均与输入电源的负极相连；The drain of the power switch S1 is connected to the positive electrode of the input power supply, the source of the power switch S1 is respectively connected to one end of the inductor L1 and one end of the capacitor C1 , the other end of the capacitor C1 is respectively connected to one end of the inductor L2 and the cathode of the diode D1 , the other end of the inductor L2 is connected to one end of the capacitor C2 , the other end of the inductor L1 , the anode of the diode D1 , and the other end of the capacitor C2 are all connected to the negative electrode of the input power supply;

n个基础单元的元器件和内部连接形式均相同，The components and internal connections of the n basic units are the same.

第1个基础单元其含有：一个电感L11，一个二极管D11，两个电容C11、C12；其中，电容C11的另一端分别与电感L11的一端、二极管D11的阴极相连，电感L11的另一端与电容C12的一端相连；The first basic unit comprises: an inductor L 11 , a diode D 11 , and two capacitors C 11 and C 12 ; wherein the other end of the capacitor C 11 is connected to one end of the inductor L 11 and the cathode of the diode D 11 , respectively, and the other end of the inductor L 11 is connected to one end of the capacitor C 12 ;

第2个基础单元其含有：一个电感L21，一个二极管D21，两个电容C21、C22；其中，电容C21的另一端分别与电感L21的一端、二极管D21的阴极相连，电感L21的另一端与电容C22的一端相连；The second basic unit comprises: an inductor L 21 , a diode D 21 , and two capacitors C 21 and C 22 ; wherein the other end of the capacitor C 21 is connected to one end of the inductor L 21 and the cathode of the diode D 21 , respectively, and the other end of the inductor L 21 is connected to one end of the capacitor C 22 ;

......依次类推，以第i个基础单元为例，其含有：一个电感Li1，一个二极管Di1，两个电容Ci1、Ci2；其中，电容Ci1的另一端分别与电感Li1的一端、二极管Di1的阴极相连，电感Li1的另一端与电容Ci2的一端相连；... and so on. Taking the i-th basic unit as an example, it contains: an inductor L i1 , a diode D i1 , and two capacitors C i1 and C i2 ; wherein the other end of the capacitor C i1 is respectively connected to one end of the inductor L i1 and the cathode of the diode D i1 , and the other end of the inductor L i1 is connected to one end of the capacitor C i2 ;

各个基础单元之间的连接形式如下：1<i≤n，The connection between each basic unit is as follows: 1<i≤n,

第1个基础单元中电容C12的一端和电感L11的另一端相连的交点，分别与第2个基础单元中电容C22的另一端、以及二极管D21的阳极相连，共同构成一个交点；第1个基础单元中电容C11的一端与第2个基础单元中电容C21的一端相连；The intersection where one end of the capacitor C12 in the first basic unit and the other end of the inductor L11 are connected are respectively connected to the other end of the capacitor C22 in the second basic unit and the anode of the diode D21 , forming an intersection together; one end of the capacitor C11 in the first basic unit is connected to one end of the capacitor C21 in the second basic unit;

第2个基础单元中电容C22的一端和电感L21的另一端相连的交点，分别与第3个基础单元中电容C32的另一端、二极管D31的阳极相连，共同构成一个交点；第2个基础单元中电容C21的一端与第3个基础单元中电容C31的一端相连；The intersection where one end of the capacitor C22 in the second basic unit and the other end of the inductor L21 are connected are respectively connected to the other end of the capacitor C32 in the third basic unit and the anode of the diode D31 , forming an intersection together; one end of the capacitor C21 in the second basic unit is connected to one end of the capacitor C31 in the third basic unit;

......依次类推，第i-1个基础单元中电容C(i-1)2的一端和电感L(i-1)1的另一端相连的交点，分别与第i个基础单元中电容Ci2的另一端、二极管Di1的阳极相连，共同构成一个交点；第i-1个基础单元中电容C(i-1)1的一端与第i个基础单元中电容Ci1的一端相连；... and so on, the intersection where one end of the capacitor C (i-1)2 in the i-1th basic unit and the other end of the inductor L (i-1)1 are connected are respectively connected to the other end of the capacitor C i2 in the ith basic unit and the anode of the diode D i1 , together forming an intersection; one end of the capacitor C (i-1)1 in the i-1th basic unit is connected to one end of the capacitor C i1 in the ith basic unit;

第1个基础单元与基本Zeta DC-DC变换器之间的连接关系如下：The connection relationship between the first basic unit and the basic Zeta DC-DC converter is as follows:

基本Zeta DC-DC变换器中电容C1的一端与电感L1的一端、以及功率开关S1的源极相连的交点，与第1个基础单元中电容C11的一端相连；The intersection point where one end of the capacitor C1 in the basic Zeta DC-DC converter is connected to one end of the inductor L1 and the source of the power switch S1 is connected to one end of the capacitor C11 in the first basic unit;

基本Zeta DC-DC变换器中电感L2的另一端与电容C2的一端相连的交点，与第1个基础单元中二极管D11的阳极和电容C12的另一端相连，共同构成一个交点；The intersection point where the other end of the inductor L2 in the basic Zeta DC-DC converter is connected to one end of the capacitor C2 is connected to the anode of the diode D11 and the other end of the capacitor C12 in the first basic unit, together forming an intersection point;

第n个基础单元中电容Cn2的一端和电感Ln1的另一端相连，构成一个交点，该交点与负载RL的一端相连，负载RL的另一端和输入电源的负极相连。One end of the capacitor C n2 in the nth basic unit is connected to the other end of the inductor L n1 to form an intersection point, which is connected to one end of the load RL , and the other end of the load RL is connected to the negative electrode of the input power supply.

所述功率开关S1的栅极接其控制器，其占空比可以在0至1之间变化。The gate of the power switch S1 is connected to its controller, and its duty cycle can be changed between 0 and 1.

本发明一种新型可扩展Zeta DC-DC变换器，技术效果如下：The present invention provides a novel scalable Zeta DC-DC converter, and the technical effects are as follows:

1、在提高变换器输入输出增益的基础上，保留了变换器的降压能力，且开关器件电压应力低。具体如下(电感L1的电流连续导通时)：1. On the basis of improving the input and output gain of the converter, the voltage-stepping capability of the converter is retained, and the voltage stress of the switching device is low. The details are as follows (when the current of the inductor L1 is continuously conducted):

输入输出增益为：

Figure GDA0004110740380000031
The input and output gains are:
Figure GDA0004110740380000031

开关管电压应力为：

Figure GDA0004110740380000032
其中D为占空比，uin为输入电压，uo为输出电压，us为功率开关电压应力，n为基础单元数量。The voltage stress of the switch tube is:
Figure GDA0004110740380000032
Where D is the duty cycle, u in is the input voltage, u o is the output voltage, us is the power switch voltage stress, and n is the number of basic units.

2、本发明变换器仅含有1个功率开关，控制策略及驱动电路简单。2. The converter of the present invention contains only one power switch, and the control strategy and driving circuit are simple.

3、通过调节本发明基础单元的个数，即可实现对变换器输入输出增益及开关器件电压应力的调节。此外，因“外衣电路”中不含有有源开关，因而本发明不改变传统Zeta DC-DC变换器的控制和驱动电路。相比于传统Zeta DC-DC变换器，本发明变换器具有：输入输出电压调节范围宽、开关器件电压应力低等优势，适用于输入或输出电压变化范围较宽的应用场合。3. By adjusting the number of basic units of the present invention, the input and output gain of the converter and the voltage stress of the switching device can be adjusted. In addition, because the "outer circuit" does not contain an active switch, the present invention does not change the control and drive circuit of the traditional Zeta DC-DC converter. Compared with the traditional Zeta DC-DC converter, the converter of the present invention has the advantages of wide input and output voltage adjustment range and low voltage stress of the switching device, and is suitable for applications with a wide range of input or output voltage changes.

附图说明BRIEF DESCRIPTION OF THE DRAWINGS

图1是本发明电路原理图。FIG. 1 is a schematic diagram of a circuit of the present invention.

图2是本发明基础单元数为2时的电路拓扑图。FIG2 is a circuit topology diagram when the number of basic units of the present invention is 2.

图3是传统Zeta DC-DC变换器电路原理图。FIG. 3 is a schematic diagram of a conventional Zeta DC-DC converter circuit.

图4是本发明基础单元数为2时的输入输出增益与传统Zeta DC-DC变换器的输入输出增益对比图。FIG. 4 is a comparison diagram of the input-output gain of the present invention when the number of basic units is 2 and the input-output gain of the traditional Zeta DC-DC converter.

图5是本发明基础单元数为2时的输入电压和输出电压仿真波形图。FIG5 is a diagram showing simulated waveforms of input voltage and output voltage when the number of basic units of the present invention is 2. FIG.

图6是本发明基础单元数为2时的开关两端端电压和占空比仿真波形图。FIG6 is a simulation waveform diagram of the voltage across the switch and the duty cycle when the number of basic units of the present invention is 2. FIG.

具体实施方式DETAILED DESCRIPTION

下面结合附图对本发明作进一步详细说明。The present invention will be further described in detail below in conjunction with the accompanying drawings.

如图2所示为本发明基础单元数为2时的电路拓扑图：FIG2 is a circuit topology diagram of the present invention when the number of basic units is 2:

一种新型可扩展Zeta DC-DC变换器，该变换器包含一个直流输入源，一个负载RL，一个基本Zeta DC-DC变换器，两个基础单元。其中：A novel scalable Zeta DC-DC converter includes a DC input source, a load R L , a basic Zeta DC-DC converter, and two basic units. Among them:

基本Zeta DC-DC变换器包含两个电感L1、L2，两个电容C1、C2，一个功率开关S1，一个二极管D1。其连接形式如下：功率开关S1的漏极连接输入电源的正极，源极连接功率电感L1的一端以及电容C1的一端，电容C1的另一端与电感L2的一端以及二极管D1的阴极相连，电感L2的另一端与电容C2的一端相连，电感L1的另一端、二极管D1的阳极以及电容C2的另一端与输入电源的负极相连。The basic Zeta DC-DC converter includes two inductors L 1 and L 2 , two capacitors C 1 and C 2 , a power switch S 1 , and a diode D 1 . The connection form is as follows: the drain of the power switch S 1 is connected to the positive pole of the input power supply, the source is connected to one end of the power inductor L 1 and one end of the capacitor C 1 , the other end of the capacitor C 1 is connected to one end of the inductor L 2 and the cathode of the diode D 1 , the other end of the inductor L 2 is connected to one end of the capacitor C 2 , the other end of the inductor L 1 , the anode of the diode D 1 , and the other end of the capacitor C 2 are connected to the negative pole of the input power supply.

两个基础单元之间的连接形式如下：The connection between the two basic units is as follows:

第1个基础单元中电容C12的一端和电感L11的另一端相连的交点与第2个基础单元中电容C22的另一端以及二极管D21的阳极相连，共同构成一个交点，第1个基础单元中电容C11的一端与第2个基础单元中电容C21的一端相连。The intersection where one end of the capacitor C12 in the first basic unit and the other end of the inductor L11 are connected is connected to the other end of the capacitor C22 in the second basic unit and the anode of the diode D21 , together forming an intersection, and one end of the capacitor C11 in the first basic unit is connected to one end of the capacitor C21 in the second basic unit.

第1个基础单元与基本Zeta DC-DC变换器之间的连接关系如下：The connection relationship between the first basic unit and the basic Zeta DC-DC converter is as follows:

基本Zeta DC-DC变换器中电容C1的一端与电感L1的一端以及功率开关S1的源极相连的交点与第1个基础单元中电容C11的一端相连；基本Zeta DC-DC变换器中电感L2的另一端与电容C2的一端相连的交点与第1个基础单元中二极管D11的阳极和电容C12的另一端相连，共同构成一个交点。The intersection where one end of the capacitor C1 in the basic Zeta DC-DC converter is connected to one end of the inductor L1 and the source of the power switch S1 is connected to one end of the capacitor C11 in the first basic unit; the intersection where the other end of the inductor L2 in the basic Zeta DC-DC converter is connected to one end of the capacitor C2 is connected to the anode of the diode D11 in the first basic unit and the other end of the capacitor C12 , together forming an intersection.

负载RL的一端与第2个基础单元中电容C22的一端和电感L21的另一端相连的交点相连，负载RL的另一端和输入电源的负极相连。One end of the load RL is connected to the intersection where one end of the capacitor C22 and the other end of the inductor L21 in the second basic unit are connected, and the other end of the load RL is connected to the negative electrode of the input power supply.

所述功率开关S1的栅极接其控制器，其占空比可以在0至1之间变化。The gate of the power switch S1 is connected to its controller, and its duty cycle can be changed between 0 and 1.

在电感L1的电流连续导通时，根据功率开关状态的不同，可以将电路分为2种工作状态：When the current of inductor L1 is continuously conducted, the circuit can be divided into two working states according to the different states of the power switch:

(1)功率开关S1导通，二极管D1、D11、D21均关断，此时电感L1、L2、L11、L21、电容C2、C12、C22充电，电容C1、C11、C21放电；电感L1、L2、L11、L21端电压如下式所示：(1) The power switch S1 is turned on, and the diodes D1 , D11 , and D21 are all turned off. At this time, the inductors L1 , L2 , L11 , and L21 , and the capacitors C2 , C12 , and C22 are charged, and the capacitors C1 , C11 , and C21 are discharged; the voltages at the terminals of the inductors L1 , L2 , L11 , and L21 are as follows:

Figure GDA0004110740380000041
Figure GDA0004110740380000041

(2)功率开关S1关断，二极管D1、D11、D21均导通，此时电感L1、L2、L11、L21、电容C2、C12、C22放电，电容C1、C11、C21充电；电感L1、L2、L11、L21端电压如下式所示：(2) The power switch S1 is turned off, and the diodes D1 , D11 , and D21 are all turned on. At this time, the inductors L1, L2 , L11 , L21 , and the capacitors C2 , C12 , and C22 are discharged, and the capacitors C1 , C11 , and C21 are charged. The voltages at the terminals of the inductors L1 , L2 , L11 , and L21 are as follows:

Figure GDA0004110740380000042
Figure GDA0004110740380000042

输出电压uo为电容C2、C12、C22的端电压uc2、uc12、uc22之和，即：The output voltage u o is the sum of the terminal voltages uc2 , uc12 , and uc22 of capacitors C2 , C12 , and C22 , that is:

uo＝uc2+uc12+uc22。u o =u c2 +u c12 +u c22 .

图4是本发明基础单元数为2时的输入输出增益与传统Zeta DC-DC变换器的输入输出增益对比图。从图4中可以看出所提变换器相较于传统Zeta变换器输入输出增益得到了很大的提高。Fig. 4 is a comparison diagram of the input-output gain of the present invention when the number of basic units is 2 and the input-output gain of the traditional Zeta DC-DC converter. It can be seen from Fig. 4 that the input-output gain of the proposed converter is greatly improved compared with the traditional Zeta converter.

图5是本发明基础单元数为2时的输入电压和输出电压仿真波形图，具体仿真参数为：输入电压uin＝48V，占空比D＝73.53％，负载电阻RL＝400Ω。根据上述输入电压和占空比，可以根据理论分析计算出扩展单元数为2时，所提变换器的输出电压约为400V。图5所示的输入输出电压仿真波形与理论分析相吻合，从而验证了理论分析的正确性和可行性。FIG5 is a diagram of the input voltage and output voltage simulation waveforms when the number of basic units of the present invention is 2, and the specific simulation parameters are: input voltage u in = 48V, duty cycle D = 73.53%, load resistance RL = 400Ω. According to the above input voltage and duty cycle, it can be calculated according to theoretical analysis that when the number of expansion units is 2, the output voltage of the proposed converter is about 400V. The input and output voltage simulation waveforms shown in FIG5 are consistent with the theoretical analysis, thereby verifying the correctness and feasibility of the theoretical analysis.

图6是本发明基础单元数为2时的开关两端端电压和占空比仿真波形图，具体仿真参数为：输入电压uin＝48V，占空比D＝73.53％，负载电阻RL＝400Ω。根据上述输入电压和占空比，可以根据理论分析计算出开关管的电压应力约为180V。图6所示的开关管电压应力仿真与理论分析相吻合，相较于传统Zeta变换器，所提变换器开关管电压应力显著降低。FIG6 is a simulation waveform diagram of the voltage at both ends of the switch and the duty cycle when the number of basic units of the present invention is 2, and the specific simulation parameters are: input voltage u in = 48V, duty cycle D = 73.53%, load resistance RL = 400Ω. According to the above input voltage and duty cycle, the voltage stress of the switch tube can be calculated to be about 180V according to theoretical analysis. The simulation of the voltage stress of the switch tube shown in FIG6 is consistent with the theoretical analysis. Compared with the traditional Zeta converter, the voltage stress of the switch tube of the proposed converter is significantly reduced.

Claims (2)

1. An expandable Zeta DC-DC converter, characterized in that the converter comprises:
an input power source, a load R L A basic Zeta DC-DC converter, n basic units;
the basic Zeta DC-DC converter includes: two inductances L 1 、L 2 Two capacitors C 1 、C 2 A power switch S 1 One diode D 1 The method comprises the steps of carrying out a first treatment on the surface of the The connection form is as follows:
power switch S 1 The drain electrode of the power switch S is connected with the positive electrode of the input power supply 1 The source electrodes of (a) are respectively connected with the inductance L 1 One end of (C) capacitor 1 Capacitance C 1 Respectively at the other ends of (a)And inductance L 2 One end of diode D 1 Is connected with the cathode of the inductor L 2 And the other end of (C) and the capacitor C 2 Is connected to one end of the inductor L 1 Is connected with the other end of diode D 1 Anode of (C), and capacitor C 2 The other ends of the two electrodes are connected with the negative electrode of the input power supply;
the components and internal connection forms of the n basic units are the same,
the 1 st base unit contains: inductance L 11 One diode D 11 Two capacitors C 11 、C 12 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the capacitor C 11 Respectively with the other end of the inductor L 11 One end of diode D 11 Is connected with the cathode of the inductor L 11 And the other end of (C) and the capacitor C 12 Is connected with one end of the connecting rod;
the 2 nd base unit contains: inductance L 21 One diode D 21 Two capacitors C 21 、C 22 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the capacitor C 21 Respectively with the other end of the inductor L 21 One end of diode D 21 Is connected with the cathode of the inductor L 21 And the other end of (C) and the capacitor C 22 Is connected with one end of the connecting rod;
.. analogize to the case of the i-th base unit, it contains: inductance L i1 One diode D i1 Two capacitors C i1 、C i2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the capacitor C i1 Respectively with the other end of the inductor L i1 One end of diode D i1 Is connected with the cathode of the inductor L i1 And the other end of (C) and the capacitor C i2 Is connected with one end of the connecting rod;
the connection form between the individual base units is as follows: 1<i is less than or equal to n,
capacitor C in the 1 st basic cell 12 And inductance L 11 The intersection points connected with the other end of the capacitor C in the 2 nd basic unit 22 Another end of (D) and diode D 21 The anodes of which are connected to form an intersection point; capacitor C in the 1 st basic cell 11 One end of (2) and capacitor C in the 2 nd base unit 21 Is connected with one end of the connecting rod;
the 2 nd radicalCapacitance C in base unit 22 And inductance L 21 The intersection points connected with the other end of the capacitor C in the 3 rd basic unit 32 Is connected with the other end of diode D 31 The anodes of which are connected to form an intersection point; capacitor C in the 2 nd base unit 21 One end of (2) and the capacitor C in the 3 rd base unit 31 Is connected with one end of the connecting rod;
.. analogize, i-1 base cell capacitor C (i-1)2 And inductance L (i-1)1 The intersection points connected with the other end of the capacitor C in the ith basic unit i2 Is connected with the other end of diode D i1 The anodes of which are connected to form an intersection point; capacitor C in the i-1 th basic cell (i-1)1 Is connected with the capacitor C in the ith basic unit i1 Is connected with one end of the connecting rod;
the connection relationship between the 1 st basic unit and the basic Zeta DC-DC converter is as follows:
capacitor C in basic Zeta DC-DC converter 1 Is connected with the inductor L 1 One end of (2), and power switch S 1 The intersection of the source connections to the capacitor C in the 1 st basic cell 11 Is connected with one end of the connecting rod;
inductance L in basic Zeta DC-DC converter 2 And the other end of (C) and the capacitor C 2 Is connected to the diode D in the 1 st basic cell 11 Anode and capacitance C of (2) 12 The other ends of the two parts are connected to form an intersection point;
capacitor C in nth base unit n2 And inductance L n1 Is connected to the other end of the load R to form an intersection point L Is connected to one end of a load R L And the other end of the power supply is connected with the negative electrode of the input power supply.
2. An expandable Zeta DC-DC converter according to claim 1, characterized by: the power switch S 1 The gate of which is connected to its controller and the duty cycle of which can vary from 0 to 1.
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