论文部分内容阅读
逆变器是一种将直流电转换成交流电的装置,它作为不停电电源装置中的一个主要部分,已广泛地应用在工矿、企业、国防、通讯等部门。常用的逆变器,按其负载与换向电容的连接情况来看,可分为并联逆变器和串联逆变器。按其输出波形来看,一般前者为正负矩形脉冲,后者为正弦波。由付氏级数可知,前者包含所有的奇次谐波,为了获得基波50赫的正弦波,其滤波部分就比较大,效率也比较低。输出为正弦波的串联式逆变器,作为工频,其电感、电容都很大,因此并不十分经济。为了获得谐波较少的波形,研制了各种逆变器电路,其中有输出等幅的脉宽式逆变器和用两个变压器叠加获得的阶梯波逆变器。本文介绍用。一个变压器获得十二阶梯的逆变器,其最低次谐波为十一次。因此其波形比较接近于正弦波,其效率也较高,滤波部分也可简单。下面对此电路进行分析.
Inverter is a device that converts direct current to alternating current. As an important part of uninterruptible power supply, inverter has been widely used in mining, enterprise, national defense, communication and other departments. Common inverter, according to the load and commutation capacitor connection situation, can be divided into parallel inverter and series inverter. According to its output waveform point of view, the former generally positive and negative rectangular pulse, which is a sine wave. From Fu’s series we can see that the former contains all the odd harmonics. In order to obtain a sine wave with a fundamental frequency of 50 Hz, the filtering part is relatively large and the efficiency is relatively low. Output as a sine wave series inverter, as the frequency, the inductance, capacitance are large, it is not very economical. In order to obtain less harmonic waveforms, a variety of inverter circuits have been developed, including pulse-width inverters with equal amplitude output and step-wave inverters obtained by superposing two transformers. This article describes the use. A transformer gets a twelve-step inverter with the lowest harmonic of eleven times. So its waveform is relatively close to the sine wave, its efficiency is higher, the filter part can be simple. The following analysis of this circuit.