Circuit Selector

Block-library: DUBSI

The Circuit Selector block can be used to activate one circuit in a block-diagram while simultaneously deactivating another, or vice versa, depending on a threshold value.

If the input signals are called u₁, u₂, and u₃, and the output signals are called y₁ and y₂, then the following equations define the switching logic:

   if u₂ is greater than or equal to the threshold, then

        y₁ = u₁
        y₂ = 0

   else

        y₁ = 0
        y₂ = u₃

In other words: u₂ is the test signal that determines whether to activate the circuit u₁ » y₁, or u₃ » y₂. The numbering of the input signals has been chosen such that it more or less resembles the input sequence for the Switch block in Simulink.

The block Output Director from the same blocklibrary provides a similar solution for 'directing' one input value to either one of two output lines.