✓Step response of parallel and series RLC circuits Page 2 Natural Response of Parallel RLC Circuits The problem – given initial energy stored in the inductor
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[PDF] Natural and Step Response of Series & Parallel RLC Circuits
✓Step response of parallel and series RLC circuits Page 2 Natural Response of Parallel RLC Circuits The problem – given initial energy stored in the inductor
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The determination of the natural response of a parallel RLC circuit (Fig 7-1) consists of finding the voltage v generated across the parallel branches by the release of energy stored in the inductor or capacitor or both
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Natural and Step Response of Series & Parallel
RLC Circuits (Second-order Circuits)
Objectives:
9Determine the response form of the circuit
9Natural response parallel RLC circuits
9Natural response series RLC circuits
9Step response of parallel and series RLC circuits
Natural Response of Parallel RLC Circuits
The problem - given initial energy stored in the
inductor and/or capacitor, find v(t) for t ш 0.It is convenient to calculate v(t) for this
circuit becauseA.The voltage must be continuous for
all timeB.The voltage is the same for all three
componentsC.Once we have the voltage, it is pretty
easy to calculate the branch currentD.All of the above
Natural Response of Parallel RLC Circuits
The problem - given initial
energy stored in the inductor and/or capacitor, find v(t) for t ш 0.0)(1)(1)(
0)(1)(1)(
0)()(1)(
2 2 2 2 0 0 dt tdvRCtvLCdt
tvdC dt tdvRtvLdt
tvdC R tvIdxxvLdt tdvC t :form standard in place to by sides both Divide :integral the remove to sides both ateDifferenti :KCLNatural Response of Parallel RLC Circuits
The problem - given initial
energy stored in the inductor and/or capacitor, find v(t) for t ш 0.0)(1)(1)(
2 2 dt tdvRCtvLCdt
tvd:equation DescribingThis equation is
9Second order
9Homogeneous
9Ordinary differential equation
9With constant coefficients
Once again we want to pick a possible solution to
this differential equation. This must be a function whose first AND second derivatives have the same form as the original function, so a possible candidate isA.Ksin t
B.Keat
C.Kt2Natural Response of Parallel RLC Circuits
The problem - given initial
energy stored in the inductor and/or capacitor, find v(t) for t ш 0.0)(1)(1)(
2 2 dt tdvRCtvLCdt
tvd:equation Describing The circuit has two initial conditions that must be satisfied, so the solution for v(t) must have two constants. Use0)]1()1([)]1()1([
0)(1)(1)(
21212121
2122
2 211
2 1
2122112
2 212 1 21
tsts tstststststs tsts eALCsRCseALCsRCs eAeALCeAseAsRCeAseAs eAeAtv:SubstituteV;
Natural Response of Parallel RLC Circuits
The problem - given initial
energy stored in the inductor and/or capacitor, find v(t) for t ш 0.0)1()1(
)(1)( 2 2121
2 2 21
LCsRCs
ss eAeAtv tvLCdt tvd tsts :EQUATION STICCHARACTERI the for solutions are and Where :Solution 0dt dv(t) RC1:equation Describing
characterizes the circuit.A.True
B.False
0)1()1(2LCsRCs
Natural Response of Parallel RLC Circuits
The problem - given initial
energy stored in the inductor and/or capacitor, find v(t) for t ш 0. rad/s) in frequency radian resonant (the and rad/s) in frequency neper (the where 0LC RCLCRCRCs
LCRCRCsLCsRCs
1 2 1 )1()21()21( 2 )1(4)1()1(;0)1()1( 2 0 222,1 2 2,1 2 r r r Z D ZDD The two solutions to the characteristic equation can be calculated using the quadratic formula:
So far, we know that the parallel RLC natural
response is given byA.The value of
B.The value of 0
C.The value of (2 - 02)
and where0LCRCs eAeAtvtsts 1 2 1 2 0 2 2,1 2121
r ZDZDD
There are three different forms for s1 and s2. For a parallel RLC circuit with specific values of R, L and C, the form for s1 and s2 depends on