Understand feedback control.
1 What to Bring
Each group should bring a USB storage device to store the screen image.
3 Open Loop Control—Plant
Figure 1: Plant Circuit
Steps:
1. Construct the plant circuit according to Figure 1. Where R0 = 10kΩ, C1 = 100µF, C2 = 0.22µF.
2. Impulse response: A=1V, width=0.1s, f=1Hz. (1 Picture)
3. Step Response: A=1V, f=1Hz.(1 Picture)
For example, for the step response, you should try to get something like the waveform shown in following figure.
Figure 2: Plant Result
Note 1: Do not destroy your plant circuit after you get the image, you are going to use it in the next part.
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Lab 3 Feedback Control
Note 2: Do not forget to supply all the op-amps with DC voltage(Pin 4(-12V) and 7(12V))
Note 3: If a capacitor is labeled“474”, its capacitance is 47 × 104 pF; “224” is 22 × 104 pF
Figure 3: Op-amp
4 Feedback Control
Figure 4: Feedback Control Circuit
Steps:
1. Add the feedback control circuit to the plant according to Figure 3. Where R1 = R3 = 150kΩ, R2 = 3kΩ, C3 = 0.47µF.
2. Impulse response: A=1V, width=0.1s, f=1Hz. (1 Picture)
3. Step Response: A=1V, f=1Hz.(1 Picture)
For example, for step response, you should try to get something like the waveform shown in the following figure.
Figure 5: Feedback Control Result
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