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飞利浦105E11彩显电源,是以 PWM 控制芯片UC3842为核心构成的变压器耦合并联型它激式开关稳压电源,稳压环路采用直接取样、光电耦合隔离。该电源电路简洁、工作可靠、功耗小,并设有完善的保护电路,一旦出现故障,立即进入自动保护状态,使故障不致于扩大造成更大的损失。笔者根据实物绘出电源电路如图1所示。该彩显在“VESA DPMS”信号的控制下有三种工作模式:“正常工作模式”、“待机模式”和“停机模式”。“VESA DPMS”功能是通过电脑主机的控制来实现的若键盘或鼠标在设置时间内不工作时,系统就将在
Philips 105E11 color display power supply is based on the PWM control chip UC3842 as the core of the transformer coupled parallel it excited switching power supply, voltage regulator loop using direct sampling, optocoupler isolation. The power supply circuit is simple, reliable, low power consumption, and has a perfect protection circuit, in the event of failure, immediately enter the automatic protection state, so that the failure will not result in greater loss. I draw the power circuit according to the kind shown in Figure 1. The color display has three modes of operation under the control of the “VESA DPMS” signal: “Normal mode”, “Standby mode”, and “Shutdown mode”. “VESA DPMS ” function is achieved through the control of the host computer If the keyboard or mouse does not work within the set time, the system will be at