共查询到20条相似文献,搜索用时 125 毫秒
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提出了IR2132驱动器在三相逆变器中的应用。采用数字信号处理器对电源系统进行全数字控制,通过改变PWM波形的脉冲宽度和调制周期可以达到调压和变频的目的。采用功率MOSFET和IGBT专用驱动芯片IR2132驱动三相桥式逆变电路。介绍了IR2132驱动电路的特点、内部结构、工作原理和基于IR2132构成的三相逆变电路结构,并提出了一种新型实用的预制相位PWM数字控制方案,取代了传统的模拟驱动电路和模块化桥臂电路设计,降低了开发成本,并融合了多元化的保护功能使逆变电源系统的驱动电路变得简单可靠。 相似文献
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基于工频变压器的独立逆变电源设计 总被引:1,自引:0,他引:1
提出一种基于工频变压器的逆变电源设计方案.该控制电路采用U3988控制器,输出PWM波形来控制逆变电路功率管,同时U3988内部具有各种电路保护作用,可使逆变电源数字化,简化电路;与无工频变压器逆变电路相比,该电路设计采用工频变压器起到隔离保护的作用,使电路具有系统可靠性功能.实验结果表明,对于传统逆变器,该设计方案不仅省去额外保护电路使电路结构简单明了,还可以使系统从无法保障稳定性到具有可靠稳定性. 相似文献
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为了提高逆变电路的转换效率,本文设计并给出了一种新型的零电压双极性窄脉冲产生电路。该逆变电路包含两个反激逆变电路部分,通过控制两反激逆变电路输出脉冲的相位差可以实现对前后两次放电时间间隔的调节。为了验证上述电路模型,设计并制作了基于12英寸介质阻挡放电平面光源的逆变电路。实验结果表明,该逆变电路可以实现零电压开关,因而提高了电路的转换效率,同传统双极性窄脉冲电路相比,其效率提高了约20%。 相似文献
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IPM在光伏并网逆变器中的应用 总被引:1,自引:1,他引:0
为了降低光伏并网逆变器的复杂性,提高系统的可靠性,可以将IPM智能功率模块PM5084LB060应用到光伏并网逆变电路中,由于其内部有驱动和保护电路,开关控制信号的产生电路输入端直接与光耦相连,光耦的输出可以直接输入IPM模块,控制IPM内部开关管的开合,实现逆变功能,光耦起隔离作用.介绍光伏逆变器和逆变电路原理,给出了开关控制信号波形和输出电压仿真波形.与其他逆变电路相比,减少了外围元器件,提高了系统可靠性. 相似文献
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林棋 《电子科学学刊(英文版)》1994,11(1):79-87
The new three phase VFVA sine wave generator is presented in this paper. A new sampling holding three phase VFVA sine wave generator's principle, circuit and experimentation waveform are introduced. The principle of this sampling holding circuit is simple and the realization of har'dware circuit is easy. Here we describe the three phase reference sine wave which is produced by this generator's circuit and is required by PWM inverter is described in this paper, and also introduced the speed control and harmonir analysis of PWM inverter variable frequency. 相似文献
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A parallel resonant DC link (PRDCL) circuit topology is proposed as an approach to realizing zero switching loss DC-AC high switching frequency power conversion. The proposed circuit is used as an interface between the DC voltage supply and a voltage source pulse width modulated (PWM) inverter to provide a short zero voltage period in the DC link of the inverter to allow zero voltage switchings to take place in the PWM inverter. The peak voltage stress on the PWM inverter switches is limited to the DC supply voltage. Another significant advantage of the circuit is that the inverter can be controlled by the conventional PWM strategy. The proposed circuit is systematically analyzed and its operation principle is explained. Design considerations and design formulas are presented. A complete zero voltage switching DC-AC system consisting of the proposed circuit and a PWM inverter was simulated on a computer 相似文献
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C. F. CHRISTIANSEN M. I. VALLA C. H. RIVETTA 《International Journal of Electronics》2013,100(6):1187-1202
In this paper, the performance of a synchronized delta modulated PWM inverter is studied analytically. This modulation strategy allows one to obtain an output waveform continuously variable from a nearly sinusoidal to a square wave without an increase in circuit complexity. The analytical solution allows learning about the harmonic spectra and the amplitude of the first harmonic of the inverter output wave, when the reference frequency varies over a wide range. These results can be profitably used in the inverter design, in order to obtain a proper control circuit according to the power stage requirements. 相似文献
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Shih-Liang Jung Meng-Yueh Chang Jin-Yi Jyang Li-Chia Yeh Ying-Yu Tzou 《Power Electronics, IEEE Transactions on》1999,14(3):522-532
This paper presents a field-programmable gate army (FPGA)-based control integrated circuit (IC) for controlling the pulsewidth modulation (PWM) inverters used in power conditioning systems for AC-voltage regulation. We also propose a multiple-loop control scheme for this PWM inverter control IC to achieve sinusoidal voltage regulation under large load variations. The control scheme is simple in architecture and thus facilitates realization of the proposed digital controller for the PWM inverter using the FPGA-based circuit design approach. Bit-length effect of the digital PWM inverter controller has also been examined in this paper. The designed PWM inverter control IC has been realized using a single FPGA XC4005 from Xilinx Inc., which can be used as a coprocessor with a general-purpose microprocessor in application of AC-voltage regulation. Owing to the high-speed nature of FPGA, the sampling frequency of the constructed IC can be raised up to the range that cannot be reached using a conventional digital controller based merely on microcontrollers or a digital signal processor (DSP). Experimental results show the designed PWM inverter control IC using the proposed control scheme can achieve good voltage regulation against large load variations 相似文献
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提出一种高性能全数字式正弦波逆变电源的设计方案。该方案分为前后两级,前级采用推挽升压电路将榆入的直流电升压到350V左右的母线电压.后级采用全桥逆变电路,逆变桥输出经滤波器滤波后,用隔离变压器进行电压采样,电流互感器进行电流采样,以形成反馈环节,增加电源输出的稳定性。升压级PWM驱动及逆变级SPWM驱动均由STM32单片机产生。减小了硬件开支。基于上述方案试制的400W样机,具有输出短路保护、过流保护及输入过压保护、欠压保护功能。50Hz输出时频率偏差小于0.05Hz,满载(400W)效率高于87%,电压精度为220V±1%,THD小于1.5%。 相似文献
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Combination voltage-controlled and current-controlled PWM invertersfor UPS parallel operation 总被引:1,自引:0,他引:1
Jiann-Fuh Chen Ching-Lung Chu 《Power Electronics, IEEE Transactions on》1995,10(5):547-558
In this paper, a scheme of combination of voltage-controlled and current-controlled PWM inverters for parallel operation of a single-phase uninterruptible power supply (UPS) is proposed. The voltage-controlled PWM inverter (VCPI) unit as a master is developed to keep a constant sinusoidal wave output voltage. The current-controlled PWM inverter (CCPI) units are operated as slave controlled to track the distributive current. The power distribution center (PDC) performs the function of distributing the output current of each active unit. In this proposed scheme of parallel operation, each of the units can be designed as nearly independent, and the CCPI units do not need a PLL circuit for synchronization. As a result, the parallel operation of UPS is easy to implement and to expand system capacity. For the purpose of illustration, the system, including three single-phase units which operate in parallel, is analyzed and experimental results are given 相似文献
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三相电流型逆变器的PWM控制方法研究 总被引:1,自引:0,他引:1
电流型逆变器通常采用正弦调制波和高频锯齿波载波比较的方式产生PWM脉冲。对于这种方法来说,如果逆变器直流输入电流中含有脉动成分,则交流输出电流中的谐波分量就会增加。为了抑制这些谐波分量,人们采用了有源滤波和无源滤波:但都还存在着这样那样的问题,要么电路复杂化,要么成本提高了,要么抑制效果不太理想。本文提出了一种有效的三相电流型逆变器的PWM控制方法,给出了利用80C196MC单片机实现的思路,通过实验证明了这种方法的正确性。 相似文献
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A V /f PWM inverter control algorithm based on controlling the stator flux vector of an induction motor is presented. The algorithm permits an automatic boost of inverter voltage in such a way that the stator flux magnitude is kept constant. The voltage autoboost method is based on knowledge of the IM equivalent circuit parameters and given load characteristics. An offline auto measurement of the equivalent circuit parameters using a PWM inverter is described. The technique consists of performing the no-load and single-phase tests when the motor is connected to the inverter. The complete control system has been constructed and tested and the experimental results have been found satisfactory. The proposed method has achieved a considerable improvement of IM torque-speed characteristics under optimal slip frequency operation 相似文献
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This paper presents a new quasi-resonant DC-link (QRDCL) inverter. Only one switching device is used to create zero voltage instants under all load conditions. The maximum voltage across the inverter devices is maintained at around (1.01-1.1) times the input source voltage. The circuit has the flexibility of selecting switching instants of the resonant link in synchronism with any PWM technique. Control technique does not require the help of inverter switches to create the zero voltage instants in the DC-link, and voltage and current sensors are eliminated from the control circuit. In this paper, the principle of operation and detailed analysis of the proposed QRDCL inverter are presented and design considerations for achieving soft switching are obtained. Detailed PSPICE simulation studies are carried out to study the feasibility of the proposed topology under various load conditions. The experimental results of the proposed QRDCL PWM inverter feeding a three phase induction motor are given. 相似文献