2 Tidied up formatting. Removed "thanks in advance". Thank afterwards by voting up and accepting answers.

I'm working on a problem that involves a CUK converterĆuk converter. The question asks "find k_c (a gain for a controller) such that the system is marginally stable". So

So I got the properly space-state model with matrices A and B. Then, I set the real part of the eigenvalues of A equal to zero and try to solve for the unknown k_c. After that I got that kc must be equal to -1.8 approximately. That is, a negative gain. Is it physically feasible to implement in real life? Does it make a difference to use a positive gain or a negative gain? Thanks in advance.

1. Is it physically feasible to implement in real life?
2. Does it make a difference to use a positive gain or a negative gain?

I'm working on a problem that involves a CUK converter. The question asks "find k_c (a gain for a controller) such that the system is marginally stable". So I got the properly space-state model with matrices A and B. Then, I set the real part of the eigenvalues of A equal to zero and try to solve for the unknown k_c. After that I got that kc must be equal to -1.8 approximately. That is, a negative gain. Is it physically feasible to implement in real life? Does it make a difference to use a positive gain or a negative gain? Thanks in advance.

I'm working on a problem that involves a Ćuk converter. The question asks "find k_c (a gain for a controller) such that the system is marginally stable".

So I got the properly space-state model with matrices A and B. Then, I set the real part of the eigenvalues of A equal to zero and try to solve for the unknown k_c. After that I got that kc must be equal to -1.8 approximately. That is, a negative gain.

1. Is it physically feasible to implement in real life?
2. Does it make a difference to use a positive gain or a negative gain?
1

# Can a controller have a negative gain?

I'm working on a problem that involves a CUK converter. The question asks "find k_c (a gain for a controller) such that the system is marginally stable". So I got the properly space-state model with matrices A and B. Then, I set the real part of the eigenvalues of A equal to zero and try to solve for the unknown k_c. After that I got that kc must be equal to -1.8 approximately. That is, a negative gain. Is it physically feasible to implement in real life? Does it make a difference to use a positive gain or a negative gain? Thanks in advance.