30 A载流能力PCB设计与实验验证
2021-03-13党旭辉李清莲廖双
党旭辉 李清莲 廖双











摘 要:通过利用PCB设计载流能力相关电流与线宽关系的经验公式,设计了一种基于大负载电磁继电器切换能力的PCB。通过实验验证了设计的PCB载流能力、铜箔厚度、线宽以及温升的合理性。结果表明在一定范围内,PCB铜箔厚度、铜箔宽度、铜箔温升与其载流能力均呈正相关关系。另外发现在最大允许通流范围内,电磁继电器表面温度与其载流能力呈正相关关系。该研究可以用于智能型面板开关电源板的设计与制造。
关键词:载流能力;铜箔厚度;铜箔宽度;温升
中图分类号:TM581.3 文献标识码:A文章编号:2096-4706(2021)15-0060-04
Abstract: By using PCB to design the empirical formula for the relationship between current carrying capacity and line width, a PCB based on the switching capacity of large load electromagnetic relay is designed. The rationality of the designed PCB current carrying capacity, copper foil thickness, line width, and temperature rise is verified through experiments. The results show that the PCB copper foil thickness, copper foil width, copper foil temperature rise and its current carrying capacity are positively correlated within a certain range. In addition, it is found that the surface temperature of the electromagnetic relay is positively correlated with its current carrying capacity within the maximum allowable through-current range. This study can be used in the design and manufacture of intelligent panel switching power supply boards.
Keywords: current carrying capacity; copper foil thickness; copper foil width; temperature rise
0 引 言
当前,在我国酒店行业,酒店客房大多采用低频卡进行取电,面板开关用于客房内总电源的控制(负载包含照明、空调、电视、热水器等);只有其探测到低频感应时才会通电。当客人离开房间时,客人顺手取走房卡(开门卡),节电开关会在15秒内自动延迟断电,有效地达到了酒店客房节能的目的。随着智慧酒店的逐渐发展,“安全+智慧”入住方式越来越受到人们的重视,特别是随着智能门锁行业的蓬勃发展,开锁方式由原有的刷房卡逐步改变为刷身份证、二维码等,房卡的作用逐步变为仅用于客房的用电、取电。
为了实现真正的智能化入住,本文以面板开关的电源板为研究对象,设计了符合行业主流最大规格(220 V/30 A)的面板开关电源板,并预留DC12V接口作为控制接口,以供后期各种场景的应用,在设计中以大电流载流能力为落脚点,通过相关要素的合理设计、生产工艺的合理优化以及实验验证,实现达到符合载流能力的PCB。……
