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采用全国联合设计的低压开关电源,接收机的电源稳压范围下限为160 V,而目前黑白电视机的主要市场—农村有相当部分地区在用电高峰时,电源电压降低,接收机不能正常收看,影响产品的销售和使用。本文对开关电源的稳压范围下限作了理论分析与计算,并与实测结果对比,找到了下限值不理想的原因,提出了改进措施,取得了较好的效果。一、稳压范围下限的计算联合设计的低压开关电源属串联式开关电源,它的基本电路、简图和有关波形见图1。
Low-voltage switching power supply designed by the United States, the receiver power supply regulation range of the lower limit of 160 V, while the current black and white TV market - a considerable part of rural areas in the peak power consumption, the power supply voltage decreases, the receiver can not watch , Affect the product sales and use. In this paper, the lower limit of the regulation voltage range of the switching power supply is theoretically analyzed and calculated. Compared with the measured results, the reason why the lower limit value is not ideal is found, the improvement measures are proposed and good results are achieved. First, the calculation of the lower limit of the voltage range Low-voltage switching power supply design joint is a series switching power supply, its basic circuit, schematic and the waveform shown in Figure 1.