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国产、进口大屏幕彩电,一般都设计为宽电源。“宽电源”宽在哪儿?怎么个宽法?为了说明有关技术,先简述一下开关电源的一般特性:普通开关电源在160～270V市电电压上工作时,其效率高,输出稳定,性能可靠。一但超出这一范围,普通开关电源的性能就随之下降了。为使彩电适应不同地区的市电电压(如市电110V和220V),仅靠普通开关电源就难以做到了。为此,国内、外厂家在大屏幕彩电中,采取在普通开关电源之前增加110V和220V市电电压自动转换电路(见图1),使二者搭配,构成了宽电源,使彩电
Domestic, imported large-screen TV, are generally designed for wide power supply. To explain the technology, briefly describe the general characteristics of switching power supply: General switching power supply in the 160 ~ 270V mains voltage on the job, its high efficiency, stable output, performance reliable. However, beyond this range, the performance of ordinary switching power supply will be reduced. In order to adapt to the color TV in different regions of the mains voltage (such as mains 110V and 220V), only ordinary switching power supply is difficult to do. To this end, domestic and foreign manufacturers in large-screen color TV, to increase 110V and 220V before the ordinary switching power supply voltage automatic conversion circuit (see Figure 1), the two with a wide power supply, the color TV