银燕牌SDW系列电子伞灯自投放市场以来，以其体积小巧、外观新颖、质量可靠、使用方便受到用户的好评。至今销量已逾三十万台，市场占有份额较大。为方便广大维修人员维修该系列电子伞灯，现根据其典型产品SDW－45作原理分析及维修介绍。一、工作原理该电路可分为电源指示、充 Yin-yan SDW series of electronic umbrella lights since the launch on the market, with its compact size, the appearance of new, reliable, easy to use by users. Has sold more than 300,000 units, the market share of larger. For the convenience of maintenance staff to repair the series of electronic umbrella lights, is based on the typical product SDW-45 for analysis and maintenance of the introduction. First, the working principle The circuit can be divided into power instructions, charge