Protection circuit for two-wire electrical devices

摘要

A protection circuit for two-wire electrical devices is used to protect two-wire electrical devices within a motor vehicle from transient signals caused by a power supply. An input terminal lead and an output terminal lead are connected to the two wire device. A capacitor is connected across the terminal leads parallel to the two wire device. A bi-directional fast acting Zener diode array is connected from the input terminal lead to the vehicle chassis to provide a virtual ground to the two-wire device. Accordingly, the electrical conduction of the diode array protects the two-wire device from any transient signals from the power supply.