Found that exist in the switch power supply, static modeling and dynamic modeling, what is the difference between the two and the function, or is there something different application scenarios?
Such as buck when the steady state, the relationship between output and input is: duty ratio D
Buck when dynamic disturbance is 0 (control), is the relationship between output and input: D/(1 + S * L/R + S ^ 2 * LC)
Which is the inductance L, R is the load, C is the capacitance, D is the duty ratio,