大屏幕彩电开关电源对冲击电流的抑制措施

Rejection of surge current in switching mode power supply for large screen colour TV receivers

在大屏幕彩色电视机中，要求开关电源在电网电压从１４０Ｖ至２８０Ｖ的范围内都能保证稳定的电压输出和足够的功率输出。当电网电压偏高时开机，有较大的冲击电流，很容易损坏开关管。文章分析了形成冲击电流的原因，并提出了解决方案。

In large screen TV sets,enough power and stable voltage output should be provided by the switching mode power supply when the mains supply voltage is in the range of 140 V to 280 V.There is a large surge current which can easily damage the switching transistor when a TV set is switched on unde the condition of that the mains power suply voltage is high.This article analyses how the surge current is formed and suggests a solution to the problem.