Passive RL and RC Filters
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1 NDSU Passive RL and RC Filters ECE 3 Passive RL and RC Filters A filter is a system whose gain changes with frequency. Essentially, all dynamic systems are filters. -Stage Low-Pass Filter For the following -stage RC low-pass filter with R = k, C = uf, Find the transfer function from X to Y Find y(t) assuming x(t) = sin (377t) Check your answer in PartSim V R V = Y X + - C i) Find the transfer function from X to Y: The LaPlace impedance of a capacitor is Z = Cs By voltage division, the gain is then Cs R+ Cs X = RCs+ This is called a low pass filter since Single-Stage RC Low Pass Filter: X RCs+ At low frequencies ( s = jω = j ), the gain is one. The input signal is passed to the output. X At high frequencies ( s large ) the gain goes to zero. The input signal is blocked. ii) Find y(t) assuming x(t) = sin (377t) Since RC =.. JSG July 7, 28
2 NDSU Passive RL and RC Filters ECE 3.s+ X Using superposition, treat this as two separate problems x(t) = 5 x(t) = 2.5 sin (377t) X = 5 X = j2.5 s = jω = j s = j377.s+ 5 s=.s+ ( j2.5) s=j377 Y = 5 Y = ( ) ( j2.5) y(t) = 5 Y = y(t) =.663 cos (377t 78 ) The total input is the sum of the two parts. The total output is the sum of the two outputs y(t) = cos (377t 78 ) The RC filter Passed the DC term ( 5V ), and Attenuated the 6Hz term from 2.5Vp to 66.3mVp iii) Check your answer in PartSim There are two ways to do this: either Check the gain of the filter at DC and 6Hz, or Check the transient response matches our calculations First, input the circuit into PartSim: JSG 2 July 7, 28
3 NDSU Passive RL and RC Filters ECE 3 Run an AC Response from. to Hz (close to Hz and 6Hz) The resulting plot looks like this: Note that At.Hz (almost DC), the gain is. as calculated At 6Hz, the gain is.264 ( vs..265 calculated ). This matches our calculations. A second method to check your answer is to run a transient simulation. A 6Hz signal has a period of 7ms. Running the simulation for 5 cycles (75ms) results in JSG 3 July 7, 28
4 NDSU Passive RL and RC Filters ECE 3 Running a transient simulation to see what the output looks like: Resulting signals at X (black) and Y (blue). Note again that this matches our calculations The output has a DC offset of 5V With a peak-to-peak amplitude of 35mVpp ( vs. 32mVpp computed ) JSG 4 July 7, 28
5 NDSU Passive RL and RC Filters ECE 3 3-Stage RC Low-Pass Filter (take ) A single stage RC low-pass filter helps to remove high-frequency terms, such as the ripple in the above example. On the basis that mode is better, a 3-stage RC low pass filter should be better than a one-stage. Example 2: For the following 3-stage RC low-pass filter with R = k, C = uf, Find the transfer function from X to Y Find y(t) assuming x(t) = sin (377t) Check your answer in PartSim V R R2 R3 V V2 V3 V + - I I2 I3 C C2 C3 3-Stage RC Low Pass Filter i) Find the transfer function from X to Y Due to loading, you can't treat this as three cascaded filters. Instead, use state-space and Matlab to get the transfer function. Assuming zero initial conditions (or that initial conditions don't matter), the voltage node equations are: I = C sv = V V R + V R 2 I 2 = C 2 s = V R 2 + R 3 I 3 = C 3 s = R 3 Solving for the derivatives JSG 5 July 7, 28
6 NDSU Passive RL and RC Filters ECE 3 sv = R C + R 2 C V + R 2 C + R C V s = R 2 C R 2 C 2 V + s = R 3 C 3 + Placing in matrix form: sv s s = Y = = R C + R 2 C R 2 C R 2 C 2 R 2 C 2 + R 3 C 3 V V + R C V Plugging in R = k, C = uf sv s s = 2 2 V + V Using Matlab to find the transfer function to V3: >> A = [-2,, ;,-2, ;,,-] >> B = [;;] >> C = [,,]; >> D = ; >> G = ss(a,b,c,d); >> zpk(g) G(s) = (s+32.47) (s+5.55) (s+.98) JSG 6 July 7, 28
7 NDSU Passive RL and RC Filters ECE 3 Note that You could solve for the transfer function by hand by simplifying 3 equations. Matlab is lots easier. For a single stage RC filter, the poles are at /RC = - For a 3-stage RC filter, the are no longer at s = - due to loading. ii) Find y(t) assuming x(t) = sin (377t) Like before, use superposition and the transfer function we just found: x(t) = 5 x(t) = 2.5 sin (377t) s = s = j377 X = 5 X = j2.5 (s+32.47)(s+5.55)(s+.98) X s= (s+32.47)(s+5.55)(s+.98) X s=j377 Y = () (5) Y = ( ) ( j2.5) Y = 5 Y =.46 7 y(t) = 5 y(t) =.46 cos (377t + 7 ) Putting it all together... y(t) = cos (377t + 7 ) iii) Check your answer in PartSim: Input the circuit into PartSim: Check the gain at DC and 6Hz: JSG 7 July 7, 28
8 NDSU Passive RL and RC Filters ECE 3 Note that The DC gain is almost (you need to go lower than.hz to see this), and The gain at 6Hz is. 834 ( vs.. 85 computed ) This matches our calculations. -Stage RC Filter (take 2) When building a 3-stage RC low-pass filter, you can't simply tack on three more stages. When analyzing the -stage RC filter we assumed that there was no loading. If you add an identical stage to V, this assumption is violated and the circuit is changed. To avoid loading, one trick is to make the impedance of each stage increase by x relative to the previous stage: R R R V V V2 V3 Y X + - C.C.C 3-Stage RC Low-Pass Filter: Y RCs+ 3 X JSG 8 July 7, 28
9 NDSU Passive RL and RC Filters ECE 3 Now, if R = k C = uf / RC = the dynamics become sv s s = V + V Using Matlab to find the transfer function: >> A = [-,, ;,-, ;,,-] >> B = [;;]; >> C = [,,]; >> D = ; >> G = ss(a,b,c,d); >> zpk(g) G(s) = (s+5.25) (s+.5) (s+6.24) This is closer to having three poles at -, but it's still a little off. JSG 9 July 7, 28
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