CN101895223B - Double-Cuk buck-boost output parallel-type converter - Google Patents

Double-Cuk buck-boost output parallel-type converter Download PDF

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CN101895223B
CN101895223B CN2010102011727A CN201010201172A CN101895223B CN 101895223 B CN101895223 B CN 101895223B CN 2010102011727 A CN2010102011727 A CN 2010102011727A CN 201010201172 A CN201010201172 A CN 201010201172A CN 101895223 B CN101895223 B CN 101895223B
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power
cuk
diode
end
anode
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CN2010102011727A
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CN101895223A (en
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王立乔
王欣
邬伟扬
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燕山大学
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Abstract

The invention discloses a double-Cuk buck-boost output parallel-type converter which is formed by connecting two Cuk-type DC/DC (direct current/direct current) converters capable of achieving the buck-boost output at the output in parallel, and can achieve the DC/AC (direct current/alternating current) single-phase conversion and further achieve the three-phase conversion through expansion. The converter has the following basic functions: the double-Cuk buck-boost output parallel-type converter can achieve the buck-boost conversion and normally serve the function of conversion even if the inputted DC voltage is lower or the variation range of the DC voltage is wider; the problem that the bridge arms are directly connected is avoided in the entire circuit, thus ensuring the high reliability; the follow current is not allowed to pass through the body diode of a switching tube, but flows through an independent diode, so that a power switching tube and a power diode can be respectively subject to optimized design; the design of circuit parameters, which is based on the method for designing a DC Cuk converter, is simple; and the inductive current runs in a continuous state, thus reducing the EMI (electro-magnetic interference). The invention is mainly applicable to the fields of photovoltaic generation, fuel-cell power generation and other power generation based on renewable energyand new energy, in which the level of operating voltage is lower or the variation range thereof is wider.

Description

双Cuk升降压输出并联型逆变器 Cuk double-down parallel output inverter

技术领域 FIELD

[0001] 本发明涉及一种电能变换装置中的逆变器,尤其涉及在既可升压也可降压的单相或多相逆变应用场合中。 [0001] The present invention relates to an electric power conversion in the inverter apparatus, and more particularly relates to a single-phase can also be a buck or boost multiphase inverter applications.

背景技术 Background technique

[0002] 可再生能源和新能源发电技术是应对能源危机,维持可持续发展,实现“低碳”经济的核心技术。 [0002] renewable energy and new energy technologies is to deal with the energy crisis, to maintain sustainable development and "low carbon" economy the core technology. 逆变器是可再生能源和新能源发电系统中的关键组件。 Inverter is a key component of renewable energy and new energy power generation system. 与传统能源相比, 可再生能源和新能源发电装置的特点是其输出功率的波动性和随机性,具体的表现就是其所提供的直流电压的变化范围比较宽。 Compared with traditional energy sources, characteristics of new renewable energy power generation device and its output power fluctuation and random, the specific performance is it provide a DC voltage range is wide. 具体到光伏阵列、燃料电池和小型风力发电机,还具有输出电压等级比较低的特点。 Specific to the photovoltaic array, fuel cell, and small wind power generator, having an output voltage of relatively low level features. 而传统的逆变器都是buck型降压变换器结构,其输入的直流电压要高于输出的交流电压峰值,不适应于可再生能源和新能源发电技术的需要。 Structure of a conventional buck converter is a buck-type inverter, the peak AC voltage input DC voltage is higher than output, suited to the needs of renewable energy and new energy generation technologies.

[0003] 对此,传统的解决方案有两种,第一种是在逆变器前加一级DC/DC变换器,提高逆变器的输入电压,但级数的增加势必会降低整体的效率。 [0003] In this regard, there are two traditional solutions, first is to add a DC / DC converter before the inverter input voltage of the inverter, an increase in the number of stages is bound to reduce the overall effectiveness. 另一种是隔离型方案,即在变换器中增加升压变压器以提高电压等级同时实现电气隔离,但变压器的加入也将增加系统成本并影响整体的变换效率。 Another embodiment is an isolated, i.e. an increase in the step-up transformer to raise the voltage level converter simultaneously achieve electrical isolation, but the addition of the transformer will also increase the cost of the system and affect the overall conversion efficiency. 显然,能够直接实现可升降压的非隔离单级型方案更加符合可再生能源和新能源发电技术的需要;本专利所提出的双Cuk升降压输出并联型逆变器正是满足上述需要的一种新型逆变方案。 Obviously, directly achieve non-isolated buck-type single-stage embodiment more in line with the new and renewable energy power generation technologies; this patent proposes a dual output buck Cuk parallel inverter is required to satisfy the above a new type of inverter solutions.

发明内容 SUMMARY

[0004] 发明目的:本发明的目的是用两个Cuk变换器构建一种可实现升降压逆变的单级单相或三相逆变器。 [0004] The object of the invention: object of the present invention is constructed using two Cuk converter which can realize a single-stage step-down inverter single-phase or three-phase inverter.

[0005] 技术方案:为了达到上述的发明目的,本发明的双Cuk升降压输出并联型逆变器包括电容分压电路、第一Cuk电路和第二Cuk电路,其中,电容分压电路由两个相串联的第一电容和第二电容构成,第一电容和第二电容的串联连接点接零电位点,第一电容另一端接外接电源的正极,第二电容另一端接外接电源的负极;第一Cuk电路中,第一功率二极管的阳极接电源正极,阴极接第一电感的一端,第一电感的另一端接第一功率开关管的阳极和第三电容的一端,第一功率开关管的阴极接零电位点,第三电容的另一端接第三功率二极管的阳极和第三功率开关管的阴极,第三功率二极管的阴极接零电位点,第三功率开关管的阴极接第五功率二极管的阴极,第五功率二极管的阳极接第三电感的一端;第二Cuk 电路中,第二功率二极管的阴极接电源负极,阳极接第二 [0005] Technical Solution: To attain the above object of the present invention, the present invention Cuk bis-down parallel output type inverter comprises a capacitance dividing circuit, a first and a second circuit Cuk Cuk circuit, wherein the capacitive voltage divider route two first and second capacitances in series configuration, a first capacitor and a second capacitor connected in series connection point of the zero potential point, the other end of the first capacitor to the positive external power supply, a second capacitor the other end of the external power supply a negative electrode; a first Cuk circuit, the anode of the first positive power supply power diode, and a cathode connected to one end of the first inductor, the other end of the anode end of the first inductor of the first power switch and a third capacitor, a first power the cathode of the switch contact points at zero potential, the other end of the third anode cathode capacitance diode and the third power of the third power switch, and a cathode connected to the zero potential point of the third power diode, and a cathode connected to the third power switch the cathode of the diode fifth power, a third inductor connected to the anode of a diode one end of fifth power; a second Cuk circuit, the cathode of the second diode is connected to the power supply cathode, an anode connected to the second 感的一端,第二电感的另一端接第二功率开关管的阴极和第四电容的一端,第二功率开关管的阳极接零电位点,第四电容的另一端接第四功率二极管的阴极和第四功率开关管的阳极,第四功率二极管的阳极接零电位点,第四功率开关管的阴极接第六功率二极管的阳极,第六功率二级管的阴极接第三电感,同第一Cuk电路一样,接于第三电感的同一端;负载一端接于第三电感的另一端,负载的另一端接零电位点。 End of the sense, the other end of the second end of the cathode of a second inductor and a fourth power switch capacitors, anode to the zero potential point of the second power switch, the other end of the fourth capacitor of a fourth diode the cathode of the power and a third inductor connected to the cathode of the anode of the fourth power switch, then the zero potential point of the anode of the fourth power diode, the anode of the diode cathode connected to the sixth power of the fourth power switch, a sixth power diode, with the first as a Cuk circuit, connected to the same end of the third inductor; a terminating load in another end of the third inductor, the other end of the zero potential point of the load.

[0006] 第一电感、第二电感和第三电感可以耦合到同一个磁芯上,大大减小了电感体积和磁芯数量,通过耦合的方法,单个电感的值也可以降低。 [0006] The first inductor, the second inductor and the third inductor may be coupled to the same magnetic core, the inductance is greatly reduced volume and number of core, by means of coupling, values ​​of the individual inductor may be reduced.

[0007] 本发明采用的双Cuk升降压输出并联型逆变器包含两个Cuk电路单元,其输入侧接分压电容电路,其输出侧接输出滤波电容和负载电路。 [0007] The present invention employs a dual output buck Cuk inverter comprises two parallel Cuk circuit unit connected to the input side capacitor voltage dividing circuit, an output connected to the output side of the filter capacitor and the load circuit. 该电路中第一开关管和第二开关管不同时工作,分别工作于正弦波的上半周期和下半周期,因此,这两个开关管不需设置死区时间,并且可以实现高频逆变。 The first circuit switch and the second switch does not operate simultaneously, each operating in the half cycle of the sine wave half period and, therefore, these two switch without dead time, and can realize a high frequency inverse change. 续流电流从功率二极管流过,无开关器件体二极管反向恢复问题。 Freewheeling current from flowing through the power diode, the switching device no body diode reverse recovery. 该逆变器增加了两只半周期常开(闭)的开关管(S3,S4)和两只功率二极管(D5, D6)组成单向开关,用于选择由Cuk电路一或是Cuk电路二对负载的供电。 The inverter increases the half cycle two normally open (closed) of the switch (S3, S4), and two power diodes (D5, D6) composed of a one-way switch for selecting two of a Cuk circuit or circuit Cuk load power supply right. 这两只开关管工作在半周导通模式下,因此整体的通态损耗并没有增加多少。 This two switch operates at half cycle conduction mode, so the overall conduction loss does not increase much. 控制方案也较简单:采用单周期控制的方法,使逆变器在正常工作时不需要偏置电流,使电感电流工作在连续模式下, 减小了EMI。 Program control is also relatively simple: the single-cycle control method, does not require a bias current of the inverter during normal operation the inductor current operation in continuous mode, reduced EMI. 单周期控制还具有动态响应快,抑制电源波动,实现简单等特点。 Single-cycle control further has a fast dynamic response, suppress power fluctuations, easy realization. 电感L1、L2 和L3的值可以较大,流经电感的电流纹波较小,电路可以输出较大的功率。 Inductor L1, L2 and L3 values ​​may be large, a smaller ripple current flowing through the inductor, the output circuit may be a large power. 由于输出侧是并联型结构,可以更为容易的构建三相系统。 Since the output side is a parallel type structure, it can be easier to build a three-phase system.

[0008] 有益效果:本发明是利用两个Cuk变换器组成的一种既可以升压又可以降压的单级逆变器,具有如下优点: [0008] Advantageous Effects: The present invention utilizes a composition of two Cuk converter and can either buck boost single stage inverter, has the following advantages:

[0009] 在输入侧母线电压高于或低于输出交流电压峰-峰值时,此种逆变器仍能正常工作,具有较宽的输入电压范围;采用单周期控制的方法,对电源的波动具有较强的抑制能力。 [0009] bus voltage higher or lower than the peak AC output voltage on the input side - at the peak of the inverter such still work, having a wide input voltage range; single-cycle control method, the power fluctuations It has a strong immunity.

[0010] Cuk变换器本身在直流-直流变换领域研究的比较成熟,在直流-直流变换中的电路参数选取原则可以移植到本逆变器中,电路参数选取较为简单,便于设计。 [0010] Cuk converter itself DC - DC converter of Comparative mature art, the DC - DC converting circuit parameters selected in principle this can be transferred to the inverter, the parameter selection circuit is simple, easy to design.

[0011] 在高频工作的功率开关管无桥臂直通问题,因此不需要设置此两个开关管的死区时间,易于实现的电路的闻频化。 [0011] In the high frequency operation of power switch bridge arm no problem, provided there is no need for this dead time the two switches, the smell of the frequency of the circuit is easy to implement.

[0012] 续流通路通过单独的功率二极管,使得功率开关管和功率二极管可以分别优化设计。 [0012] Continued flow path through a separate power diodes, such that the power switch and the power diode design can be optimized separately.

[0013] 电感电流连续,因此输出端只需一个小容量的滤波电容就可以实现较好的正弦波形输出。 [0013] continuous inductor current, so the output of only a small capacity can be achieved better filter capacitor sine wave output.

附图说明 BRIEF DESCRIPTION

[0014] 图I是本发明的双Cuk升降压输出并联型逆变器的电路结构示意图; [0014] Figure I bis is a schematic diagram of a circuit configuration of the present invention Cuk-down parallel to the output of the inverter;

[0015] 图2是本发明的三相双Cuk升降压输出并联型逆变器构建示意图; [0015] FIG. 2 is a dual-phase of the present invention Cuk-down parallel output inverter Scheme for construction;

[0016] 图3-6是本发明的双Cuk升降压输出并联型逆变器各开关模态示意图; [0016] FIG. 3-6 is a dual invention Cuk-down inverter outputs in parallel the respective switching modes schematic;

[0017] 图7是本发明的双Cuk升降压输出并联型逆变器的功率开关管的驱动波形示意图; [0017] FIG. 7 is a bis Cuk driving waveform diagram according to the present invention, the parallel inverter power switch buck-boost output;

[0018] 图8是本发明的双Cuk升降压输出并联型逆变器的各电感电流和输出电压波形图; [0018] FIG. 8 is a respective inductor current and output voltage waveforms of the present invention Cuk bis-down parallel to the output of the inverter;

[0019] 图9是本发明的双Cuk升降压输出并联型逆变器采用的控制图; [0019] FIG. 9 is a bis-down Cuk present invention FIG parallel output inverter control employed;

[0020] 图10是本发明的双Cuk升降压输出并联型逆变器采用的给定波形及第三和第四功率开关管的驱动波形。 [0020] FIG. 10 is a double-down Cuk present invention outputs a driving waveform of a given waveform and the third and fourth power switches employed in the parallel inverter.

[0021] 上述附图中的主要符号名称:1.电容分压电路;2.第一Cuk电路;3.第二Cuk电路;4.输出滤波电路及负载;C1〜C2——输入侧分压大电容。 . [0021] The main symbolic names in the above figures:... A capacitance dividing circuit; a first Cuk circuit 2; 3 Cuk second circuit; 4 output filter circuit and the load; C1~C2-- input side dividing large capacitance. Cf——输出滤波电容。 Cf-- output filter capacitor. C3〜C4——Cuk变换器电容。 C3~C4 - Cuk converter capacitance. Dl〜D6——功率二极管。 Dl~D6-- power diode. LI〜L3——线性电感。 LI~L3-- linear inductor. SI〜S4——功率开关管。 SI~S4-- power switch. 2Ud——逆变器输入电压即直流侧母线电压。 2Ud-- i.e. the DC input voltage of the inverter side bus voltage. iLl——电感LI的电流。 iLl-- LI inductor current. iL2——电感L2的电流。 iL2-- L2 current. iL3——电感L3的电流。 iL3-- inductor L3 current. R——负载阻抗。 R-- load impedance. Vrefl——第一Cuk变换器单周控 The first one week Vrefl-- Cuk converter control

制的给定。 A given system. Vref2-第二Cuk变换器单周控制的给定。 Cuk converter Vref2- second given one cycle control. Rint-积分电路电阻。 Rint- integrating circuit resistance. Cint- Cint-

积分电路电容。 Integrating circuit capacitance.

具体实施方式 Detailed ways

[0022] 如附图I所示,本实施方案的双Cuk升降压输出并联型逆变器,包括电容分压电路I、第一Cuk电路2和第二Cuk电路3,电容分压电路I由两个相串联的第一电容Cl和第二电容C2构成,第一电容Cl和第二电容C2的串联连接点接零电位点,第一电容Cl另一端接外接电源的距极,第二电容C2另一端接外接电源的负极;第一Cuk电路2中,第一功率二极管Dl的阳极接电源正极,阴极接第一电感LI的一端,另一端接第一功率开关管的阳极SI 和第三电容C3的一端,第一功率开关管SI的阴极接零电位点,第三电容C3的另一端接第三功率二极管D3的阳极和第三功率开关管S3的阴极,第三功率二极管D3的阴极接零电位点,第三功率开关管的阳极接第五功率二极管D5的阴极,第五功率二极管D5的阳极接第三电感L3的一端;第二Cuk电路3中,第二功率二级管D2的阴极接电源负极,阳极接第二电 [0022] As shown in I, this embodiment Cuk bis-down parallel output inverter comprising a capacitance dividing circuit I the drawings, a first and a second circuit 2 Cuk Cuk circuit 3, a capacitance dividing circuit I consists of two series with a first capacitor Cl and the second capacitor C2, the first capacitor Cl and the series connection point of the second capacitor C2 is connected to the zero potential point, the other end of the first capacitor Cl of the power supply from the external electrode, a second the other end of capacitor C2 is the negative external power; a first Cuk circuit 2, a first anode to the positive power supply of the power diode Dl, LI cathode connected to one end of the first inductor, the other end of the first power switch SI anode tube and One end of the capacitor C3 is three, the first power switch SI cathode connected to the zero potential point, the other end of the third capacitor C3 is the third power anode of diode D3 cathode, and the third switch S3 of the power transistor, the third power diode D3 cathode connected to zero potential point connected to the anode end of the third inductor L3 is connected to the third anode cathode power switch tube fifth power diode D5, the fifth diode D5 power; 3, the second power of the second diode circuit Cuk D2 negative one cathode, the anode is electrically connected to a second L2的一端,第二电感的另一端接第二功率开关管S2的阴极和第四电容C4的一端,第二功率开关管S2的阳极接零电位点,第四电容C4的另一端接第四功率二极管D4的阴极和第四功率开关管S4的阳极,第四功率二极管D4的阳极接零电位点,第四功率开关管S4的阴极接第六功率二极管D6的阳极,第六功率二级管D6的阴极接第三电感L3,同第一Cuk电路2 —样,接于第三电感的同一端;负载4 一端接于第三电感L3的另一端,负载4的另一端接零电位点。 L2 of the end, the other end of the cathode of the second inductor of the second power switch S2 and an end of the fourth capacitor C4, the anode to the zero potential point of a second power switch S2, the other end of the fourth capacitor C4 is a fourth the anode of the diode D4 cathode power and the fourth power switch S4, the fourth power diode D4 anode to the point of zero potential, the fourth power switch S4 is connected to the cathode of a sixth power anode of diode D6 and a sixth power diode D6 cathode connected to the third inductor L3, with a first circuit Cuk 2 - like, connected to the same end of the third inductor; L3 of the load 4 and the other end terminates in a third inductor, the other end of the load point 4 of the zero potential.

[0023] 双Cuk升降压型输出并联型逆变器在输出电流小于零的负半周,第一Cuk电路2 工作,第二Cuk电路3不工作,功率开关管S4关断,功率开关管S3闭合。 [0023] bis Cuk buck parallel output inverter output current is less than zero in the negative half cycle, the first work Cuk circuit 2, a second Cuk circuit 3 does not operate, the power switch S4 is turned off, the power switch S3 closure. 此时电路包括两个工作模态: And the circuit comprises two operating modes:

[0024] 工作模态I [0024] The operating mode of I

[0025] 如附图3所示,功率开关管SI和S3闭合,S2和S4关断,电源给LI充电,LI的电流iLl线性上升,电容C3通过负载流过L3,L3的电流iL3反向上升。 [0025] As shown in Figure 3, power switch S3 are closed and SI, S2 and S4 are turned off, power to charge LI, LI iLl current increases linearly, flowing through capacitor C3 through the load L3, L3 reverse current iL3 rise. 续流二极管D3截止。 Freewheeling diode D3 is turned off.

[0026] 工作模态II [0026] The working mode II

[0027] 如附图4所示,功率开关管SI、S2、S4关断,S3闭合,iLl给C3充电,从D3续流, iL3从D3续流,流过负载。 [0027] As illustrated in Figure 4, the power switch SI, S2, S4 OFF, S3 is closed, charging iLl to C3, D3 from freewheeling, IL3 D3 from freewheeling, flow through the load.

[0028] 在输出电流大于零的正半周,第二Cuk电路3工作,第一Cuk电路2不工作,功率开关管S3保持关断,S4全开通。 [0028] The output current is greater than zero in the positive half cycle, the second work Cuk circuit 3, a first Cuk circuit 2 does not operate, the power remains off and the switch S3, S4 full opening. 此时电路也包括两个工作模态: And the circuit also comprises two operating modes:

[0029] 工作模态III [0029] The working mode III

[0030] 如附图5所示,功率开关管S2和S4开通,SI和S3关断,电流流过L2返回电源负极,iL2线性上升,C4通过L3和负载组成闭合环路,L3的电流iL3正向上升。 [0030] As shown in Figure 5, the power switch S2 and S4 are open, the SI and S3 are turned off, current flows through the negative power supply return L2, iL2 is linearly increased, C4 through the closed loop consisting of the load and the L3, L3, current iL3 forward rise. 续流二极管D4截止。 Freewheeling diode D4 is turned off.

[0031] 工作模态IV [0031] The operating mode of IV

[0032] 如附图6所示,功率开关管SI、S2、S3关断,S4开通,电流流过D4,C4,L2返回电源负极,L2的电流iL2线性下降,iL3通过D4续流导通,给负载供电。 [0032] As shown in Figure 6, the power switch SI, S2, S3 OFF, S4 open, current flows through D4, C4, L2 negative power supply return, L2 current iL2 decreases linearly, IL3 freewheeling turned through D4 , to power the load.

[0033] 以上四个工作模态可用表I来表示,电路关键波形如附图8所示,在输出电流过零处即两个Cuk电路2、3工作切换的位置,两个Cuk电路2、3交替工作,以维持输出电压波形。 [0033] than four working modes can be used to represent the table I, the key circuit waveform as shown in FIG. 8, the output current at the zero crossing i.e. working position of the two switching circuits 2 Cuk, Cuk two circuits 2, 3 operate alternately to maintain the output voltage waveform.

[0034] 表I双Cuk输出并联型逆变器的功率管开关组合状态 [0034] Table I bis Cuk parallel type output power transistor inverter switch combination state

[0035] [0035]

Figure CN101895223BD00061

[0036] 为实现以上工作原理,采用控制方案如附图9所示:本文为实现逆变功能采用的是单周控制,选取二极管D3和D4两端的电压作为反馈电压,经积分后与给定电压相比较, 决定SI和S2的关断时刻,另外,SI和S2的开通时刻由时钟电路触发。 [0036] To achieve the above principle, the use of the control scheme as shown in Figure 9: This function is implemented using a single inverter cycle control, select the voltage across the diodes D3 and D4 as a feedback voltage, and after a given integration voltage comparison determines the off time of SI and S2, additionally, SI and S2 turn triggered by a timing circuit clock. 单周控制的给定不能给直流电压源,而应该给半个正弦波的正半周,另外的半个周期给定为零,两个给定端的正弦正半周相位应该相差180°。 One cycle control can not be given to the DC voltage source, but rather to the positive half cycle of the half sine wave, the other half cycle of a given zero, given two ends of the positive half cycle sine phase difference should be 180 °. 而开关管S3和S4的驱动波形应跟随两个给定端,保持半个正弦波周期的常开常关,相互互补,两个给定波形和S3、S4的驱动波形如附图10所示。 While switches S3 and S4 of the drive waveform should follow the given two ends, the normally open normally closed half cycle sine wave, mutually complementary, and two given waveforms S3, S4, driving waveforms as shown in Figure 10 . 控制的效果使得输出电流基准大于零时,开关管S4常开,SI、S3关断,S2调制工作;在电流基准小于零的负半周,开关管S3常开,S2、S4关断,SI调制工作。 Effect control such that the output current reference is greater than zero, the switch S4 is NO, the SI, S3 OFF, S2 modulation work; current reference is less than zero, the negative half cycle, the switch S3 is NO, S2, S4 is turned off, the SI modulation jobs.

Claims (5)

1. 一种双Cuk升降压输出并联型逆变器,其特征在于,包括电容分压电路(I)、第一Cuk 电路(2)和第二Cuk电路(3);电容分压电路⑴由两个相串联的第一电容(Cl)和第二电容(C2)构成,第一电容(Cl)的一端和第二电容(C2)的一端串联连接点接零电位点N, 第一电容(Cl)另一端接外接电源2Ud的正极,第二电容(C2)另一端接外接电源2Ud的负极;第一Cuk电路(2)中,第一功率二极管(Dl)的阳极接电源2Ud的正极,阴极接第一电感(LI)的一端,第一电感(LI)的另一端接第一功率开关管的阳极(SI)和第三电容(C3)的一端,第一功率开关管(SI)的阴极接零电位点N,第三电容(C3)的另一端接第三功率二极管(D3)的阳极和第三功率开关管(S3)的阴极,第三功率二极管(D3)的阴极接零电位点N,第三功率开关管(S3)的阳极接第五功率二极管(D5)的阴极,第五功率二极管(D5)的阳极 1. A dual output buck Cuk parallel inverter, characterized in that it comprises a capacitive voltage divider circuit (the I), Cuk a first circuit (2) and a second Cuk circuit (3); capacitance dividing circuit ⑴ a first capacitor (Cl) and a second capacitor (C2) connected in series by two configuration, ends of the first capacitor (Cl) and a second capacitor (C2) connected in series connection point of the zero potential point N, a first capacitor (Cl) the other end of the positive electrode of the external power supply 2Ud, a second capacitor (C2) the other end of the external power supply negative 2Ud; (2), a first power diode (Dl) of the first anode to the positive power supply circuit 2Ud the Cuk one end of a first inductor connected to the cathode (LI), the other end of the anode end of the first inductor (LI) of a first power switch (SI) and a third capacitor (C3), the first power switch (SI) cathode connection point of the zero potential N, the other end of the third anode cathode capacitor (C3) of the third power diode (D3) and a third power switch (S3), the third power diode (D3) connected to the cathode of zero potential point N, the fifth power anode to cathode of the diode (D5) of the third power switch (S3), the fifth power diode (D5) anode 接第三电感(L3)的一端;第二Cuk电路(3)中,第二功率二极管(D2)的阴极接电源2Ud的负极,第二功率二极管(D2)的阳极接第二电感(L2)的一端,第二电感(L2)的另一端接第二功率开关管(S2)的阴极和第四电容(C4)的一端,第二功率开关管(S2)的阳极接零电位点N,第四电容(C4)的另一端接第四功率二极管(D4)的阴极和第四功率开关管(S4)的阳极, 第四功率二极管(D4)的阳极接零电位点N,第四功率开关管(S4)的阴极接第六功率二极管(D6)的阳极,第六功率二级管(D6)的阴极接第三电感(L3),同第一Cuk电路(2) —样,接于第三电感(L3)的同一端;负载(4) 一端接于第三电感(L3)的另一端,负载(4)的另一端接零电位点N。 An end of the third inductor (L3); a second Cuk circuit (3), a second power diode (D2) connected to the cathode of the 2Ud negative power, a second power diode (D2) connected to the anode of a second inductor (L2) one end of the other end of the cathode end of the second inductor (L2) of the second power switch (S2) and a fourth capacitor (C4), the second power switch (S2) of the anode to the zero potential point N, the first four anode capacitance (C4) the other end of the fourth power of the cathode of diode (D4) and a fourth power switch (S4), the fourth power diode (D4) the anode to the zero potential point N, the fourth power switch the anode (S4) connected to the cathode of a sixth power diode (D6), and a cathode connected to the third inductor (L3) power sixth diode (D6), the Cuk with a first circuit (2) - like, to the third the same end of the inductance (L3); and a load (4) and the other end terminates in a third inductor (L3), the load (4) the other end of the zero potential point N.
2.如权利要求I所述的双Cuk升降压输出并联型逆变器,其特征在于,第一电感(LI), 第二电感(L2)和第三电感(L3) f禹合在同一个磁芯上。 2. I claim the Cuk double-down parallel to the output inverter, characterized in that the first inductance (LI), a second inductor (L2) and a third inductor (L3) f in the same and Yu a magnetic core.
3. —种三相系统,其特征在于,用三个如权利要求I所述的双Cuk升降压输出并联型逆变器构建,三个所述双Cuk升降压输出并联型逆变器的输入使用同一个外接电源2Ud和电容分压电路。 3. - species phase system, wherein, the I with the three double Cuk claim buck constructed parallel to the output inverter, the three parallel output bis Cuk buck inverter using the same input and an external power supply 2Ud capacitor voltage dividing circuit.
4.如权利要求I所述的双Cuk升降压输出并联型逆变器,其特征在于,波动的直流电源和恒定的直流电源均能作为外接电源2Ud ;瞬时值低于和不低于交流侧峰-峰值电压的外接电源2Ud,均能使所述双Cuk升降压输出并联型逆变器正常工作。 4. I claim the Cuk double-down parallel to the output inverter, characterized in that the fluctuation of DC power and DC power constant as the external power supply can 2Ud; and below the instantaneous value of not less than AC side peak - peak voltage of the external power supply 2Ud, are to make the double-down Cuk parallel output inverter is working properly.
5.如权利要求I所述的双Cuk升降压输出并联型逆变器,其特征在于带体内反并联二极管的功率开关管和外接反并联二极管的功率开关管均适用于第一、第二、第三和第四功率开关管。 5. I claim the Cuk double-down parallel to the output inverter, characterized in that the in vivo anti-parallel diode with a power switch and an external anti-parallel diode of the power switch are applied to the first, second third and fourth power switch.
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