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在电力线路上使用的载波频带中,除带滤波器式宽频带阻波器中电感的分布电容必须加以考虑,在设计时,L_1的分布电容可以并入并联的电容C_1中,而表示L_2的分布电容的自然谐振频率f0成为设计参数之一。为了保证在给定截止频率f2′和f_1′范围内输入阻抗大于KR,采用了和f2′与f1′稍有差别的设计用的截止频率f2和f1,按照f2和f1进行设计,就可使在f2′和f1′时的输入阻抗电阻部分等于R。f2—f1比f2′—f1大些。这两个频率可以从给定的f2′、f1′、f0′和电感电容的功率因数中求出。f0一般可以采用在1.5f2′和2f2′间的数值为宜,大于2f2′的f0会使扼阻频带中的颠值阻抗降抵,小于1.5f2′f的f0会使扼阻频带外的输入阻抗降低得太快。末端电阻KR中的K以采用1和0.95间的数值为宜,如果K小于0.95,扼阻频率带中的最低阻抗KR变得太小;如果K大于1,在给定的f2′—f1′情况下所需频宽f2 f1变得大些,这就提高强流线圈的电感L_1,使所需采用的有色金属多些。
In the carrier frequency band used on the power line, the distributed capacitance of the inductor in the band-filtered wide band filter must be taken into consideration. At design time, the distributed capacitance of L_1 can be incorporated into the parallel capacitor C_1 to represent the distribution of L_2 The natural resonant frequency f0 of the capacitor becomes one of the design parameters. To ensure that the input impedance is greater than KR for a given cut-off frequency f2 'and f_1', the cut-off frequencies f2 and f1, which are slightly different from f2 'and f1', are used, designed in accordance with f2 and f1 The input impedance resistance part at f2 'and f1' equals R. f2-f1 larger than f2'-f1. These two frequencies can be found from the given f2 ', f1', f0 'and the power factor of the inductor capacitor. f0 generally can be used in the 1.5f2 'and 2f2' between the appropriate values, f0 greater than 2f2 'impedance in the strangulation band will drop the top of the impedance, less than 1.5f2'f the f0 will make the input outside the strangulation band The impedance drops too fast. K in the terminal resistance KR is preferably a value between 1 and 0.95. If K is less than 0.95, the lowest impedance KR in the choke frequency band becomes too small; if K is greater than 1, then at a given f2'-f1 ' The case of the required bandwidth f2 f1 becomes larger, which increases the inductor L_1 of the high-current coil, necessitating more non-ferrous metals to be used.