CN106972751B - Double-tube Z-source direct-current voltage converter - Google Patents

Double-tube Z-source direct-current voltage converter Download PDF

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CN106972751B
CN106972751B CN201710231519.4A CN201710231519A CN106972751B CN 106972751 B CN106972751 B CN 106972751B CN 201710231519 A CN201710231519 A CN 201710231519A CN 106972751 B CN106972751 B CN 106972751B
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inductor
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CN106972751A (en
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陈艳峰
陈柱
张波
丘东元
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South China University of Technology SCUT
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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
    • H02M3/158—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 including plural semiconductor devices as final control devices for a single load

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

本发明公开了一种双管Z源直流电压变换器，包括电压源、电感、电容、第一开关管、第二开关管、第一二极管、第二二极管和负载；所述电压源的正极与电感的一端连接，其负极分别与第一开关管的源极和第一二极管的阴极连接；所述第一开关管的漏极分别与第二二极管的阴极、电容的正极和负载的一端连接；所述第二开关管的漏极分别与第二二极管的阳极和电感的另一端连接；所述第二开关管的源极分别与第一二极管的阳极、电容的负极和负载的另一端连接。本发明结构简单，控制方式方便，输入电流连续，且能够在低占空比实现较高的输出电压增益，电路不存在启动冲击问题。

The invention discloses a dual-tube Z-source DC voltage converter, which includes a voltage source, an inductance, a capacitor, a first switch tube, a second switch tube, a first diode, a second diode and a load; the voltage The anode of the source is connected to one end of the inductor, and its cathode is connected to the source of the first switch tube and the cathode of the first diode respectively; the drain of the first switch tube is connected to the cathode of the second diode and the capacitor respectively. The anode of the second switch tube is connected to one end of the load; the drain of the second switch tube is connected to the anode of the second diode and the other end of the inductor; the source of the second switch tube is connected to the first diode’s The anode, the negative pole of the capacitor, and the other end of the load are connected. The invention has the advantages of simple structure, convenient control mode, continuous input current, high output voltage gain at low duty cycle, and no start-up shock problem in the circuit.

Description

一种双管Z源直流电压变换器A Two-tube Z-source DC Voltage Converter

技术领域technical field

本发明涉及电力电子变换器的技术领域，尤其是指一种双管Z源直流电压变换器。The invention relates to the technical field of power electronic converters, in particular to a dual-tube Z-source DC voltage converter.

背景技术Background technique

随着工业生产的快速发展，大功率、高增益的变换器在需要电能变换的场合发挥着越来越重要的作用。近些年来提出的Z源变换器实现了低占空比时获得较大的输出电压，克服了Boost变换器由于极限占空比所导致的开关管和二极管峰值电流过大等缺陷。然而，传统的Z源变换器输入电流不连续，不利于输入侧滤波，同时Z源变换器采用了两个电容、两个电感，不利于减小系统的体积和提高系统的功率密度。With the rapid development of industrial production, high-power, high-gain converters are playing an increasingly important role in occasions that require power conversion. The Z-source converter proposed in recent years achieves a large output voltage at a low duty cycle, and overcomes the defects of the boost converter such as the excessive peak current of the switch tube and diode caused by the limit duty cycle. However, the input current of the traditional Z-source converter is discontinuous, which is not conducive to input side filtering. At the same time, the Z-source converter uses two capacitors and two inductors, which is not conducive to reducing the volume of the system and improving the power density of the system.

发明内容Contents of the invention

本发明的目的在于克服现有技术的不足与缺点，提供了一种双管Z源直流电压变换器，适用于需要高增益非隔离型的电力电子电路。The purpose of the present invention is to overcome the deficiencies and shortcomings of the prior art, and provide a dual-tube Z-source DC voltage converter, which is suitable for high-gain non-isolated power electronic circuits.

为实现上述目的，本发明所提供的技术方案为：一种双管Z源直流电压变换器，包括电压源、电感、电容、第一开关管、第二开关管、第一二极管、第二二极管和负载；所述电压源的正极与电感的一端连接，其负极分别与第一开关管的源极和第一二极管的阴极连接；所述第一开关管的漏极分别与第二二极管的阴极、电容的正极和负载的一端连接；所述第二开关管的漏极分别与第二二极管的阳极和电感的另一端连接；所述第二开关管的源极分别与第一二极管的阳极、电容的负极和负载的另一端连接。In order to achieve the above purpose, the technical solution provided by the present invention is: a dual-tube Z-source DC voltage converter, including a voltage source, an inductor, a capacitor, a first switch tube, a second switch tube, a first diode, a second switch tube, and a second switch tube. Two diodes and a load; the positive pole of the voltage source is connected to one end of the inductor, and its negative pole is respectively connected to the source of the first switching tube and the cathode of the first diode; the drains of the first switching tube are respectively Connected to the cathode of the second diode, the positive pole of the capacitor and one end of the load; the drain of the second switch tube is connected to the anode of the second diode and the other end of the inductor respectively; The source is respectively connected to the anode of the first diode, the cathode of the capacitor and the other end of the load.

所述电压源和电感依次串联构成一个支路，在同一个支路内，电压源和电感的位置能够交换，但依据电流的流向必须是电压源的正极串联电感的一端，或电感的另一端串联电压源的负极。The voltage source and the inductance are connected in series to form a branch. In the same branch, the positions of the voltage source and the inductance can be exchanged, but according to the flow direction of the current, it must be one end of the positive series inductance of the voltage source, or the other end of the inductance. The negative terminal of the series voltage source.

本发明与现有技术相比，具有如下优点与有益效果：Compared with the prior art, the present invention has the following advantages and beneficial effects:

本发明结构简单，控制方式方便，输入电流连续，且能够在低占空比实现较高的输出电压增益，电路不存在启动冲击问题。The invention has the advantages of simple structure, convenient control mode, continuous input current, high output voltage gain at low duty cycle, and no start-up shock problem in the circuit.

附图说明Description of drawings

图1是本发明所述双管Z源直流电压变换器的电路原理图。Fig. 1 is a schematic circuit diagram of the dual-tube Z-source DC voltage converter of the present invention.

图2a、图2b分别是本发明所述双管Z源直流电压变换器在第一开关管S1和第二开关管S2导通和关断中两个主要阶段的等效电路图，图中实线表示变换器中有电流流过的部分，虚线表示变换器中无电流流过的部分。Fig. 2 a, Fig. 2 b are the equivalent circuit diagrams of two main stages in the first switch tube S1 and the second switch tube S2 turn-on and turn-off of the double-tube Z-source DC voltage converter of the present invention respectively, among the figure The solid line indicates the part where current flows in the converter, and the dashed line indicates the part where no current flows in the converter.

图3是本发明电路的仿真主要工作波形图。Fig. 3 is a simulation main working waveform diagram of the circuit of the present invention.

具体实施方式Detailed ways

下面结合具体实施例对本发明作进一步说明。The present invention will be further described below in conjunction with specific examples.

参见图1所示，本实施例所提供的双管Z源直流电压变换器，包括电压源Vi、电感L、电容C、第一开关管S1、第二开关管S2、第一二极管D1、第二二极管D2和负载R；所述电压源Vi的正极与电感L的一端连接，其负极分别与第一开关管S1的源极和第一二极管D1的阴极连接；所述第一开关管S1的漏极分别与第二二极管D2的阴极、电容C的正极和负载R的一端连接；所述第二开关管S2的漏极分别与第二二极管D2的阳极和电感L的另一端连接；所述第二开关管S2的源极分别与第一二极管D1的阳极、电容C的负极和负载R的另一端连接。Referring to Fig. 1, the dual-transistor Z-source DC voltage converter provided in this embodiment includes a voltage source V i , an inductor L, a capacitor C, a first switching tube S 1 , a second switching tube S 2 , a first two Diode D 1 , second diode D 2 and load R; the anode of the voltage source V i is connected to one end of the inductance L, and its cathode is respectively connected to the source of the first switching tube S 1 and the first diode The cathode of D1 is connected; the drain of the first switching tube S1 is respectively connected to the cathode of the second diode D2, the positive pole of the capacitor C and one end of the load R; the drain of the second switching tube S2 The poles are respectively connected to the anode of the second diode D2 and the other end of the inductor L; the source of the second switching tube S2 is respectively connected to the anode of the first diode D1, the negative pole of the capacitor C and the load R the other end of the connection.

电压源Vi和电感L依次串联构成一个支路，在同一个支路内，电压源Vi和电感L的位置可以交换，但依据电流的流向必须是电压源Vi的正极串联电感L的一端，或电感L的另一端串联电压源Vi的负极。The voltage source V i and the inductance L are connected in series to form a branch. In the same branch, the positions of the voltage source V i and the inductance L can be exchanged, but the flow direction of the current must be that of the positive series inductance L of the voltage source V i . One end, or the other end of the inductor L, is connected in series with the negative pole of the voltage source V i .

第一开关管S1和第二开关管S2导通时，电压源Vi和电容C对电感L充电；电容C为负载R供电。第一开关管S1和第二开关管S2关断时，电压源Vi和电感L通过第一二极管D1和第二二极管D2对电容C充电，同时给负载R供电。本发明结构简单，控制方式方便，能够在低占空比实现较高的输出电压增益。When the first switching tube S1 and the second switching tube S2 are turned on, the voltage source V i and the capacitor C charge the inductor L; the capacitor C supplies power to the load R. When the first switching tube S1 and the second switching tube S2 are turned off, the voltage source V i and the inductor L charge the capacitor C through the first diode D1 and the second diode D2, and supply power to the load R at the same time . The invention has simple structure, convenient control mode and can realize higher output voltage gain at low duty ratio.

参见图2a、图2b所示，给出了第一开关管S1和第二开关管S2导通和关断中两个主要阶段的等效电路图。结合图2a、图2b，本实施例上述的双管Z源直流电压变换器的工作过程如下：Referring to Fig. 2a and Fig. 2b, the equivalent circuit diagrams of the two main stages in the turn-on and turn-off of the first switching tube S1 and the second switching tube S2 are given. 2a and 2b, the working process of the above-mentioned dual-tube Z-source DC voltage converter in this embodiment is as follows:

阶段1，如图2a：第一开关管S1和第二开关管S2导通，此时第一二极管D1和第二二极管D2关断；电路中形成2个回路，分别是：电压源Vi和电容C对电感L充电；电容C为负载R供电。Stage 1, as shown in Figure 2a: the first switching tube S1 and the second switching tube S2 are turned on, and at this time the first diode D1 and the second diode D2 are turned off; two loops are formed in the circuit, They are: the voltage source V i and the capacitor C charge the inductor L; the capacitor C supplies power to the load R.

阶段2，如图2b：第一开关管S1和第二开关管S2关断，此时第一二极管D1和第二二极管D2导通；电路中形成2个回路，分别是：电压源Vi和电感L通过第一二极管D1和第二二极管D2对电容C充电，同时给负载R供电。Stage 2, as shown in Figure 2b: the first switching tube S1 and the second switching tube S2 are turned off, and at this time the first diode D1 and the second diode D2 are turned on; two loops are formed in the circuit, They are respectively: the voltage source V i and the inductor L charge the capacitor C through the first diode D 1 and the second diode D 2 , and supply power to the load R at the same time.

综上情况，一个开关周期内，设开关管占空比为d，设电感L和电容C的电压分别为vL、vC，设输出电压为Vo，得出以下电压增益的推导过程。To sum up, in one switching cycle, set the duty cycle of the switching tube as d, set the voltages of the inductor L and capacitor C as v L and v C respectively, and set the output voltage as V o , the following derivation process of the voltage gain is obtained.

第一开关管S1和第二开关管S2导通期间，对应阶段1所述的工作情形，因此有如下公式：During the conduction period of the first switching tube S1 and the second switching tube S2, it corresponds to the working situation described in stage 1, so the following formula is given:

vL＝Vi+vC (1)v L =V i +v C (1)

第一开关管S1和第二开关管S2关断期间，对应阶段2所述的工作情形，因此有如下公式：During the off period of the first switching tube S1 and the second switching tube S2, it corresponds to the working situation described in stage 2, so the following formula is given:

vL＝Vi-vC (2)v L =V i -v C (2)

由以上分析，根据电感的伏秒特性，有，From the above analysis, according to the volt-second characteristics of the inductance, there are,

(Vi+vC)d+(Vi-vC)(1-d)＝0 (3)(V i +v C )d+(V i -v C )(1-d)=0 (3)

由式子(3)可得，电容电压为：From formula (3), the capacitor voltage is:

在一个开关周期内，输出电压与电容电压相等，即In one switching cycle, the output voltage is equal to the capacitor voltage, that is

由式子(5)可知，本发明所述的双管Z源直流电压变换器的电压增益为与传统的Z源变换器的电压增益一致。故本发明在占空比d小于0.5的情况下，能实现较大的电压增益。同时，本发明只使用一个电感和一个电容，实现了输入电流的连续，减少了系统的体积和提高了系统的功率密度。From formula (5), it can be known that the voltage gain of the dual-tube Z-source DC voltage converter described in the present invention is It is consistent with the voltage gain of the traditional Z-source converter. Therefore, the present invention can realize a relatively large voltage gain when the duty ratio d is less than 0.5. At the same time, the invention only uses one inductance and one capacitance, which realizes the continuous input current, reduces the volume of the system and improves the power density of the system.

在电压源Vi＝1V，占空比d＝0.4的情况下，由式子(5)得到的输出电压的理论分析结果为Vo＝5V。图3所示对应参数下的仿真波形，可以看出输出电压的仿真结果也接近5V，从而有效验证了理论分析的正确性。在占空比d＝0.4的情况下，本发明的变换器的电压增益为5，而传统Boost变换器的增益为1.67。可见，故本发明在占空比d小于0.5的情况下，能实现较大的电压增益。同时，本发明结构简单，控制方便，实现了输入电流的连续，提高了系统的功率密度，具有较高的应用价值。In the case of the voltage source V i =1V and the duty cycle d=0.4, the theoretical analysis result of the output voltage obtained by the formula (5) is V o =5V. The simulation waveform under the corresponding parameters shown in Figure 3 shows that the simulation result of the output voltage is also close to 5V, thus effectively verifying the correctness of the theoretical analysis. In the case of duty ratio d=0.4, the voltage gain of the converter of the present invention is 5, while the gain of the conventional Boost converter is 1.67. It can be seen that the present invention can achieve a larger voltage gain when the duty ratio d is less than 0.5. At the same time, the invention has simple structure, convenient control, realizes continuous input current, improves system power density, and has high application value.

以上所述实施例只为本发明之较佳实施例，并非以此限制本发明的实施范围，故凡依本发明之形状、原理所作的变化，均应涵盖在本发明的保护范围内。The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all changes made according to the shape and principles of the present invention should be covered within the protection scope of the present invention.

Claims (2)

1. A double-tube Z-source direct-current voltage converter is characterized in that: comprising a voltage source (V)i) An inductor (L), a capacitor (C), a first switch tube (S)1) A second switch tube (S)2) A first diode (D)1) A second diode (D)2) And a load (R); the voltage source (V)i) The positive pole of the first switch tube is connected with one end of an inductor (L), and the negative pole of the first switch tube is respectively connected with the first switch tube (S)1) Source and first diode (D)1) The cathode of (a) is connected; the first switch tube (S)1) Respectively with a second diode (D)2) The cathode of the capacitor (C), the anode of the capacitor (C) and one end of the load (R) are connected; the second switch tube (S)2) OfThe poles are respectively connected with a second diode (D)2) Is connected with the other end of the inductor (L); the second switch tube (S)2) Respectively with a first diode (D)1) The anode of (C), the cathode of the capacitor (C) and the other end of the load (R) are connected.
2. The double-tube Z-source direct-current voltage converter according to claim 1, characterized in that: the voltage source (V)i) And an inductor (L) are connected in series in sequence to form a branch circuit, and a voltage source (V) is arranged in the same branch circuiti) The position of the inductor (L) can be exchanged, but the voltage source (V) is required according to the current flowing directioni) One end of the positive electrode of the inductor (L) is connected in series, or the other end of the inductor (L) is connected in series with a voltage source (V)i) The negative electrode of (1).
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