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Uninterrupted AC power inverter on the waveform of

Ming (Qingdao University, Qingdao 266071) Keywords: l issues to form Tf) bow. Bow, 3 total respect for local passenger power, (, Jf) S power with a wide range of computer applications. In order to ensure safe and reliable operation of the computer system of a waveform to its AC power quality and reliability must be guaranteed at present. Is used in single-phase UPS power supply to the computer system. In this paper, the main link inverter UPS power generated by AC square wave voltage waveform analysis. Easily obtained by a simple square wave filter, reducing the filter design capacity. Sinusoidal AC voltage waveform to improve the degree. UPS to reduce the size and weight, reduce the cost of two voltage waveform analysis using Fourier series expansion, the square wave and sine wave quality of contact between the rate expressed as follows: 1_ Let f (x) is 2 cycles. E is the amplitude of the cycle, the number of faces is f (x) the Fourier series expansion as:, = + police + police +. - +] Where the first such sinx is the fundamental square wave f (x) by the ideal of the filtered sine wave For the rest of the harmonics to be filtered by the filter, filter out the more thorough, Finally get closer to the ideal sine wave. 2 Let (x) is 2 cycles, the width adjustable AC square wave. If (x) the Fourier series expansion as:, = yu scold war-r + s + c, etc., etc. + ... where visible, (x) and 0 values are closely related. Therefore, by appropriate choice of 0, so that some times the size of which can reduce the harmonic amplitude is zero (x) the purpose of harmonic content. Uninterrupted AC power inverter waveforms on the appropriate choice of Q values of 3 observations (x) series expansion of the rich in the lowest third harmonic harmonic harmonic amplitude that is seal ∞ s calyx. When the check. ; When the third harmonic harmonic amplitude of zero so (x) the expansion is:) a threat of a threat of a 5 7 Ferret 7z ... · calculate f (x) and (x) fundamental and the harmonic amplitude included in the table below fundamental harmonic amplitude of the third harmonic amplitude multiplier {seven nine five-octave frequency f (X) 1273E0424El0.255E0.182E0,belstaff outlet, 141E ∞ (x) 1.103E0f0. ZZlE0I58EO order to facilitate this f (x) and (x) the harmonic components, the respective fundamental amplitude is set to 1, then the amplitude of the standard harmonic What value the amplitude of the table below three times the fundamental harmonic amplitude Seven five-octave frequency band nine frequency l11lffx) l357911 (x) l0-O7 rms on non-sine wave voltage method, f (x) of the harmonic voltage is √ ({)+( ancient ) + (number) + (Ji) a 0-429 (x) the harmonic voltage is :/()() z: 0.248, the calculation of frequency November and included a higher harmonic beam to . Park for their amplitude is very small, especially filtered by their level of attenuation and frequency proportional to the square. f (x) is the fundamental harmonic RMS RMS 0429 times. And (x) is the fundamental harmonic RMS RMS 0.248 times the fundamental frequency of the lowest times Haobo and closest to the greatest difficulties of its filtered. The section (X) in this part of the third harmonic harmonic no longer exists (x) from the ideal sinusoidal transfer of the transition f (x) to be recent, often known as quasi-sine square cross. Volume 4 Conclusion of Qingdao University 93 from the analysis. Domestic single-phase low-power current UPS, the inverter square wave mostly f (x) square wave shape. If the change in subject sine square wave (x), UPS in the filter size, weight and cost can be decreased, you can derive some benefit. ADISCUSSIONONINVERTERWAVESINUNINTERRUPTEDPOWERSUPPLYLuQingying (QingdaoWorkerSparetimeUniversity, Qingdao266021) ChengMing (ElectricalEngineeringDepartment, QingdaoUniversity, Qingdao266071)