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所谓单电源窄脉冲待机控制电路,有两个含义:一是单电源,即只有一个开关电源而没有常规彩电的副电源(遥控电源),正常工作与待机时 CPU 所需的+5V 电压都由开关电源提供;二是窄脉冲,即在正常工作的情况下,开关电源工作在大功率、宽脉冲状态,而在待机时工作在小功率、窄脉冲状态,使开关电源各路输出电压降至正常工作时的1/3～1/5左右。由于这种待机方式节能降耗,降低了机内温升,已经被越来越多的新型大屏幕彩电采用。本文简要介绍其工作原理,并结合实际中较为常见的故障,给出了两个维修实例,供参考。
The so-called single-supply narrow pulse standby control circuit, there are two meanings: First, a single power supply, that is, only one switching power supply and no secondary power of conventional TV (remote power supply), normal work and standby CPU required by the 5V voltage Switching power supply; the second is a narrow pulse, that is, under normal working conditions, the switching power supply work in high-power, wide pulse state, and work in standby mode, low-power, narrow pulse state, the switching power supply output voltage drop to Normal work about 1/3 to 1/5 or so. Because of this standby mode energy saving, reducing the temperature inside the machine, has been more and more new large-screen color TV use. This article briefly describes its working principle, combined with the actual more common failures, given two maintenance examples for reference.