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交流固态继电器特点

2019/8/20 8:16:16      点击:
ssr成功地实现了弱信号 (vsr)对强电(输出端负载电压)的控制。由于光耦合器的应用,使控制信号所需的功率极低(约十余毫瓦就可正常工作),而且vsr所需的工作电平与 ttl、htl、cmos等常用集成电路兼容,可以实现直接联接。这使ssr在数控和自控设备等方面得到广泛应用。在相当程度上可取代传统的“线圈-簧片触点式”继电器(简称“mer”)。  ssr由于是全固态电子元件组成,与mer相比,它没有任何可动的机械部件,工作中也没有任何机械动作; ssr由电路的工作状态变换实现“通”和“断”的开关功能,没有电接触点,所以它有一系列mer不具备的优点,即工作高可靠、长寿命(有资料表明ssr的开关次数可达108-109次,比一般mer的106高几百倍);无动作噪声;耐振耐机械冲击;安装位置无限制;很容易用绝缘防水材料灌封做成全密封形式,而且具有良好的防潮防霉防腐性能;在防爆和防止臭氧污染方面的性能也极佳。这些特点使ssr可在军事(如飞行器、火炮、舰船、车载武器系统)、化工、井下采煤和各种工业民用电控设备的应用中大显身手,具有超越mer的技术优势。  交流型ssr由于采用过零触发技术,因而可以使ssr安全地用在计算机输出接口上,不必为在接口上采用mer而产生的一系列对计算机的干扰而烦恼。此外,ssr还有能承受在数值上可达额定电流十倍左右的浪涌电流的特点。
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