Techniques for Passive Circuit Analysis for. State Space Differential Equations
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1 Techniques for Passive Circuit Analysis for chp4 1 State Space Differential Equations 1. Draw circuit schematic and label components (e.g., R 1, R 2, C 1, L 1 ) 2. Assign voltage at each node (e.g., e 1, e 2 ) 3. Assign current in each component (e.g., i 1, i 2,..) and show positive current direction with arrows 4. Write equation for current for each component (e.g., i R1 = (e 1 -e 2 )/R 1 or i C1 = CDe 1 ) 5. Write node equations for each significant node (not connected to voltage or current source) 6. Use capacitor voltages and inductor currents as state variables, rearrange component equations in first-order form. Use remaining component and node equations to reduce differential equations so that they contain only state variables and input voltage or current sources Order of differential equations will be equal to number of capacitors and inductors that are not connected in trivial manner (e.g., two capacitors in series/parallel with no R or L between them)
2 chp4 2 Example 5: Pair-Share: RLC Circuit For the circuit shown above, write all modeling equations and derive the transfer function e 2 /e 0. All initial conditions are zero. Derive the state-space representation of the system
3 chp4 3 Example 5: Pair-Share: RLC Circuit i i R1 L i C1 ic2 i R2
4 chp4 4 Example 5: Pair-Share: RLC Circuit
5 chp4 5 Example 5: Pair-Share: RLC Circuit
6 Example 6: RLC Circuit With Parallel chp4 6 Bypass Resistor For the circuit shown above, write all modeling equations and derive a differential equation for e 1 as a function of e 0. Express required initial conditions of this second-order differential equations in terms of known initial conditions e 1 (0) and i L (0). Derive the state-space representation of the system using variables e 1 and i L
7 chp4 7 Example 6: RLC Circuit With Parallel Bypass Resistor i R1 i R2 i L i C
8 chp4 8 Example 7: Pair-Share: RLC Circuit With Two Voltage Inputs For the circuit shown above, write all modeling equations and derive a transfer function relating e 4 as a function of inputs e 1 and e 2. Derive a state-space representation of the system using two state variables and two inputs. What are the initial conditions of the state variables?
9 chp4 9 Example 7: Pair-Share: RLC Circuit With Two Voltage Inputs i R1 i R2 i L i R4 i C
10 chp4 10 Example 7: Pair-Share: RLC Circuit With Two Voltage Inputs
11 chp4 11 Example 7: Pair-Share: RLC Circuit With Two Voltage Inputs
12 chp4 12 Example 7: Pair-Share: RLC Circuit With Two Voltage Inputs
13 chp4 13 Active Circuit Analysis
14 chp4 14 Electrical System Composed of resistors, capacitors, inductors, transistors, amplifiers, power supplies Passive circuits: respond to applied voltage or current and do not have any amplifiers Active circuits: made of transistors and/or amplifiers, require active power source to work Basic quantities Charge q [coulomb] = 6.24x10 18 electrons Current i [ampere] = dq/dt Voltage e [Volt] = dw/dq Energy or Work w [joule] Power p [watt] = e x i = dw/dt
15 chp4 15 Operational Amplifier Op-amp: integrated circuit that amplifies voltage positive power supply inverting input non-inverting input (reference, usu. grounded) output negative power supply Key properties High gain (> 10 6 volt/volt) -> ideal computation device Low output impedance (< 100 ohms) -> output voltage does not vary with output current, so amplifier drives loads as ideal voltage source High input impedance (10 6 ohms) and low input voltage -> no current is required by amplifier Idealizations: zero noise, infinite bandwidth
16 chp4 16 Operational Amplifier Component equations: Z f : feedback impedance Z i : input impedance Node equation: Substitute component eqs. into node eq: Input is grounded and differential power supply is used Z f /Z i is small compared to G
17 chp4 Basic Op-Amp Circuits 17
18 chp4 18
19 chp4 19 Example 8: Op-Amp Circuit Above is a an op-amp circuit with impedances on the plus and minus inputs, derive the output equation e 0 as a function of e n and e p. The amplifier has characteristic e 0 =G(e ap -e an ), where G >> 1. Show that if all impedances are resistive and equal to R, then e 0 =e p -e n.
20 chp4 20 Example 8: Op-Amp Circuit i Zf i Zn i Zp i Zg
21 chp4 21 Example 8: Op-Amp Circuit i Zf i Zn i Zp i Zg
22 chp4 22 Example 8: Op-Amp Circuit
23 chp4 23 Example 9: Pair-Share: Op-Amp Circuit i Rf Above is a an op-amp circuit used to drive an electromagnetic coil on a servo valve. Write all the modeling equations and derive the transfer function for i v as a function of input voltage e i. Derive a state-space representation for the system. i Ri i C i v
24 chp4 24 Example 9: Pair-Share: Op-Amp Circuit
25 chp4 25 Example 9: Pair-Share: Op-Amp Circuit
26 chp4 26 Example 10: Full-Bridge Strain Gauge Circuit
27 chp4 27 Example 10: Full-Bridge Strain Gauge Circuit =R 2
28 chp4 28 Example 10: Full-Bridge Strain Gauge Circuit
29 chp4 29 Example 11: Pair-Share: Audio Amplifier Circuit w/ Light Bulb
30 chp4 30 Example 11: Pair-Share: Audio Amplifier Circuit w/ Light Bulb
31 chp4 31 Example 11: Pair-Share: Audio Amplifier Circuit w/ Light Bulb
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