Isolation the process or fact of isolating These two simple circuits provide 0-V switching. They can be used with full wave bridges or in anti-parallel to provide full wave control and are normally used to trigger power thyristors. If an input signal is present during the time the ac voltage is between 0 to 7 V, the SCR will turn on. But, if the ac voltage has risen above this range and the input signal is then applied, the transistor, Ql, will be biased to the `on` state and will hold the SCR and, consequently, the relay ' 'off' until the next zero crossing.
Isolation and 0-V Switching logic Circuit Diagram
Using a SCR Coupler