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实达(STAR)NT-560彩显在我国的应用较多,由于随机未带电路图,故笔者根据实物绘出了该开关电源电路的工作原理图(见图1)。该开关电源电路是以KIA3842(U101)为核心构成的变压器耦合并联型它激式开关稳压电源,主要特点如下: ——KIA3842的供电电路采用锁存技术,无须市电输入自动切换电路、恒流驱动电路,展宽了市电电压输入范围,简化了电路结构,便于检修。
STAR (STAR) NT-560 color display more applications in our country, due to the random without the circuit diagram, so the author according to the physical drawing of the switching power supply circuit works (see Figure 1). The switching power supply circuit is based on KIA3842 (U101) as the core of the transformer-coupled parallel switching power supply it exciting type, the main features are as follows: - KIA3842 power supply circuit using latch technology, no mains input automatic switching circuit, constant Flow drive circuit, broadening the mains voltage input range, simplifying the circuit structure, easy maintenance.