Theory and design of electronic relays

A unified theory on the principles and characterizations of electronic relays is presented. A basic realization scheme is shown to consist of a cascade connection of an isolation box, an analog-to-binary converter, and an electronic switch. A total of eight canonic realizations are given for synthesizing each of the four types of electronic relays. In conclusion the design of two complete practical electronic relays is presented and the actual performance is verified through experimental measurements.