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A Relay Drive Circuit for a Safe Operation Order and its Fail-safe Measures

机译：用于安全操作命令的继电器驱动电路及其故障安全措施

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摘要

A fail-safe relay drive circuit, which outputs only under no-malfunction situations and which outputs to two relays with some time difference to avoid the common mode failure of the welding of contacts, is proposed. The output and the correct safe timing of driving/de-driving the relays is achieved by CMOS inverters and linear regulators, as well as the relay drive circuit with constant output voltage by a transformer. In introducing CMOS inverters, which are the most common logic, to safety-related applications, countermeasures against self-oscillation in the case of input open-faults are the main concern, and this can be addressed by providing the electrical source and the input signal for the inverter pins with the same timing, or adding a capacitor and metal shield to the CMOS inverter input. The relay drivers output high powered with stability and band-pass filter characteristics, and booting ground voltage level of ICs by the similar transformers increases tolerance to line-cross at lines to relays or noise by EMC coupling within the circuit. This paper describes the relay drive circuit for the safe operation order and the fail-safe measures to realise the function, as well as safety analyses of these, and reveals the validity and expandability of these safety measures.
机译：提出了一种故障安全继电器驱动电路，该电路仅在无故障情况下输出，并且以一定的时差输出到两个继电器，以避免触点焊接的共模故障。通过CMOS反相器和线性稳压器，以及通过变压器提供恒定输出电压的继电器驱动电路，可以实现继电器的驱动输出和正确的安全定时。在将最常见的逻辑CMOS逆变器引入与安全相关的应用中时，主要考虑的是针对输入断路情况下的自激振荡的对策，这可以通过提供电源和输入信号来解决。对于具有相同时序的反相器引脚，或在CMOS反相器输入端添加电容器和金属屏蔽层。继电器驱动器输出具有稳定和带通滤波器特性的高功率输出，并且通过类似的变压器引导IC的接地电压电平会增加对继电器线路的线交叉或电路内的EMC耦合产生的噪声的容忍度。本文介绍了用于安全操作顺序的继电器驱动电路和实现功能的故障安全措施，并对其进行了安全性分析，并揭示了这些安全措施的有效性和可扩展性。

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