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STR41090开关电源见图1所示。适用机型有:海虹HH2061AR、佳丽 EC2016AR、长城 JTC512、长虹 CJK5181、CJK5182等彩电。属于自激式并联型开关电源,产生112V和18V 两种直流电压输出。当交流市电在150～280V 范围变化时,开关频率变化范围是40～80kHz,远高于普通行脉冲调制的开关频率,选取这样高的开关频率优点是:一
STR41090 switching power supply shown in Figure 1. Applicable models are: Haihong HH2061AR, Belle EC2016AR, Great Wall JTC512, Changhong CJK5181, CJK5182 and other color TV sets. A self-excited parallel switching power supply, resulting in 112V and 18V two DC voltage output. When AC mains is changed in the range of 150 ~ 280V, the switching frequency varies from 40 ~ 80kHz, which is much higher than the switching frequency of common line pulse modulation. The advantage of choosing such a high switching frequency is that one