There are 4 permutations: natural response and step response for both parallel and for series RLC circuits

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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1. There are 4 permutations: natural response and step response for both parallel and for
series RLC circuits
2. Find a=1/2RC for parallel and a-R/2L for series
3. Find co²=1/LC and compare a² to co²
4.
Choose form of solution for second-order diff eqn with constant coeff's
If a wo, then x(1) Xr+ A₁ exp Sit+ A2 exp S₂ąt where S₁2=-a +√(a²-c0²)
If a<, then x(t) = X + B₁ exp (-at) cos wat + B₂ exp (-at) sin coat where co =√(₂²-a²)
If a, then x(t) = Xr+ D₁ t exp (-at) + D₂ exp (-at)
5.
Determine from circuit if X<= 0 or not.
6. Find coeff's A, B, D by evaluating x(0) and dx(0)/dt. x(0) is given by circuit conditions
and dx(0)/dt can be found by knowing that i-C dv/dt =-i-i-lo-V/R or by
knowing that VL - L di/dt and v₁(0)= -1,R - Vo. In either case, I, and V, are determined
by the circuit. Solve equations simultaneously for A, B, D.
7. Write full equation for x(t) and test for x(0) and x(co).
Transcribed Image Text:1. There are 4 permutations: natural response and step response for both parallel and for series RLC circuits 2. Find a=1/2RC for parallel and a-R/2L for series 3. Find co²=1/LC and compare a² to co² 4. Choose form of solution for second-order diff eqn with constant coeff's If a wo, then x(1) Xr+ A₁ exp Sit+ A2 exp S₂ąt where S₁2=-a +√(a²-c0²) If a<, then x(t) = X + B₁ exp (-at) cos wat + B₂ exp (-at) sin coat where co =√(₂²-a²) If a, then x(t) = Xr+ D₁ t exp (-at) + D₂ exp (-at) 5. Determine from circuit if X<= 0 or not. 6. Find coeff's A, B, D by evaluating x(0) and dx(0)/dt. x(0) is given by circuit conditions and dx(0)/dt can be found by knowing that i-C dv/dt =-i-i-lo-V/R or by knowing that VL - L di/dt and v₁(0)= -1,R - Vo. In either case, I, and V, are determined by the circuit. Solve equations simultaneously for A, B, D. 7. Write full equation for x(t) and test for x(0) and x(co).
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