共查询到17条相似文献,搜索用时 218 毫秒
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基于双向DC/DC变换器的单级逆变拓扑研究 总被引:4,自引:2,他引:2
单级式逆变器较传统的两级式逆变器结构简单、所用器件少、成本低、可靠性高,而且减少了同时高频开关工作的器件数目,降低了开关损耗,在中小功率应用场合具有明显的优势.本文提出一类新的隔离型单级逆变电路拓扑,它由两个双向DC/DC隔离变换器电路组合而成,包括Flyback、隔离Cuk、隔离Sepic 3种类型.对这类单级隔离逆变电路的工作原理及控制策略进行了理论和仿真分析研究,并在100VA 27VDC/115V400Hz单级式反激逆变器样机上进行了实验验证.实验结果与仿真结果一致,验证了该类电路和控制方案的可行性. 相似文献
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《中国电机工程学报》2019,(14)
传统的电压型逆变器只能实现降压逆变,且使用电解电容,体积大、可靠性低,应用于新能源发电系统等领域时具有很大的局限性。提出一种新型无电解电容的单级非隔离逆变器拓扑,该逆变器由2个改进型Zeta电路组合而成,所含开关器件及无源器件数量较少,以容值较小的非电解电容作为中间储能元件,具有体积小、可靠性高、使用寿命长的优点。分析新型逆变器的工作原理,推导得出中间储能电容电压公式及逆变器增益;建立该逆变器数学模型,设计闭环调节器,并进行仿真验证;在理论分析和仿真实验的基础上,对新型无电解电容的单级Zeta逆变器搭建实验样机,实验结果证明,该逆变器具有良好的动静态性能。 相似文献
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同步整流反激逆变器研究 总被引:6,自引:0,他引:6
研究了由两路双向反激直流变换器输入并联输出串联构成的反激逆变器。在连续工作模式的反激逆变器的基础上,提出同步整流控制方案,即输出功率较大时实现同步整流,较小时实现零电压开通,大大简化了传统电流源高频链逆变器的控制方案,从而有效地降低了整流二极管导通损耗,将整机效率提高到85.8%。研究内容包括工作模式、控制策略、关键参数设计准则、同步整流或零电压开通的实现和边界问题。原理试验样机验证了该逆变器及其控制策略的正确性和先进性,证实其适合于低压大电流变换场合。 相似文献
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高占空比反激逆变器研究 总被引:1,自引:0,他引:1
提出一种反激逆变器拓扑结构,该逆变器工作于电感电流断续模式。介绍了电路的工作原理和控制原理,给出了控制方案和主要参数设计。通过实验验证了电路具有良好的稳态和动态特性,负载适应性好,运行可靠,具有四象限运行的能力。采用电源输出能量的通道与接收回馈能量的通道完全分离的方式,使得最大占空比可以大于0.5,从而得到了较宽范围的输出、输入电压。电路结构简单,主电路只需要3只功率开关管就实现了DC/AC单级变换和能量双向传输。 相似文献
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Ajaykumar T Nita R. Patne 《International Journal of Circuit Theory and Applications》2019,47(10):1615-1629
This paper proposes a fault-tolerant switched capacitor (SC)–based boost multilevel inverter. The proposed inverter is able to convert a low-level dc voltage into a desired ac output voltage in single-stage power conversion. It can accomplish a high voltage gain by using multiple SC cells arrangement at reduced voltage stresses on the switching devices and passive circuit elements in the boost network. The principle of operation and steady-state analysis of the proposed topology are presented to formulate the mathematical relationship between input dc and output ac voltage. In addition to that, the proposed inverter can also provide reliable electrical power supply at prescribed ac output voltage in the event of open-circuit failure of power switches. The fault tolerability is realized by reconfiguring the pulse width modulation (PWM) control scheme, whereas the reduction in output voltage is compensated by the boosting characteristic of the inverter. The effectiveness of the proposed inverter has been compared with other impedance source multilevel inverters in terms of voltage gain, boosting capability, and voltage stresses. A laboratory prototype of the proposed inverter is developed for experimentation, and its operation is validated by simulation and experimental results. 相似文献
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常规的Z源逆变器具有任意升降压的功能,同时其所需要的开关器件数量比普通升降压电路少,其单级式结构体积小效率高,而从传统Z源逆变器发展出来的quasi-Z源逆变器,不仅具有所有传统Z源逆变器的优点,同时可以降低器件的应力并减小开关纹波。本文提出的开关电感型quasi-Z源逆变器利用电感和二极管的组合取代了传统quasi-Z源电路中的电感,既保留了传统quasi-Z源电路的优点,同时提高了逆变器的升压倍数和电路的可靠性,而电容电压应力及电感电流应力比开关电感型Z源逆变器低,特别适合于光伏发电等新能源发电领域。通过利用改进的SVPWM控制算法对开关电感型quasi-Z源光伏逆变器进行仿真及实验,验证了该电路及算法的可靠性、稳定性及有效性,适合于光伏发电并网系统。 相似文献
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Sajad Arab Ansari Javad Shokrollahi Moghani Mohammad Mohammadi 《International Journal of Circuit Theory and Applications》2019,47(1):103-132
In this paper, a novel zero current switching (ZCS) flyback inverter in discontinuous conduction mode (DCM) is proposed. In the proposed flyback inverter, the ZCS for the primary switch is achieved by adding a simple auxiliary circuit to the conventional flyback inverter. Also, the auxiliary switch is turned on and turned off at ZCS condition. Therefore, the switching losses of the switches are negligible, which increases the efficiency and allows higher switching frequency and more compact design. The resonant auxiliary cell is activated only in short transition times that makes its conduction losses negligible. Furthermore, the voltage overshoot of the main switch is limited during the turn-off process, which allows utilization of lower voltage metal-oxide semiconductor field-effect transistors (MOSFETs) with low conduction losses and low cost. The detailed operation of the flyback inverter with auxiliary circuit and design considerations are presented. Simulation and experimental results are presented to verify the performance of the proposed inverter. 相似文献