摘要
电容屏已被广泛应用,为了规避触屏无响应、触摸乱跳等异常,需优化触屏及电源设计。优化方案有:提高触屏自身抗干扰、降低电源共模噪声干扰。为了降低共模干扰,一可降低电源自身共模噪声、二是抑制来自电网环境的干扰。对于抑制电网干扰,可使用带Y电容接地的Ⅰ类电源,而反激式Ⅱ类电源需采用无Y电容方案。利用EFT及CS两种测试方法对比验证有Y及无Y电容方案,结果表明,无Y电容的Ⅱ类反激电源能有效降低触摸屏受干扰。
Since capacitive touch panel have been widely used,it is necessary to optimize the design of touch panel and power supply to avoid abnormalities such as non-response of touch panel and touch jumping.The optimization schemes includes:improving the anti-noise performance of the touch panel and reducing the common-mode noise of the power supply.In order to reduce common-mode noise,for one hand is to reduce the common-mode noise of the power supply,and for the other is to suppress interference from the AC mains.For suppressing AC mains interference,a ClassⅠpower supply with a Y capacitor grounded can be used,while a ClassⅡpower supply requires a solution without a Y capacitor.Using EFT and CS tests,the scheme with and without Y capacitor was verified.The results show that ClassⅡflyback power supply without Y capacitor can effectively reduce the abnormality of the capacitive touch panel.
作者
陈孝锡
Chen Xiao-xi(Fuji an LANDI Commercial Equipment Co.,Ltd,Fujian Fuzhou 350001)
出处
《电子质量》
2019年第12期65-68,共4页
Electronics Quality
