Second, a number of LED driver topologies were introduced in the round. The topology type is divided into non-switching power supply and switching power supply.
其次系统地介绍了可应用于LED驱动的一些拓扑，将拓扑分为非开关电源式和开关电源式。
Car body external indicator light (led explosion-proof type), need installed on both sides of each car shall not be less than 6 light (a car has been flow power supply).
车体外部两侧需安装指示灯(LED防爆型)，每车不得少于6盏(一车一直流电源)。
LED panel shows the working state and trouble type, benefits and seeks each work which examines the power in time;
LED面板显示工作状态和故障类型，便于及时寻检电源的各个工作；
LED panel shows the working state and trouble type, benefits and seeks each work which examines the power in time;
LED面板显示工作状态和故障类型，便于及时寻检电源的各个工作；
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