lab2 - 2.737 Mechatronics Laboratory Assignment 2: Analog...

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2.737 Mechatronics Laboratory Assignment 2: Analog Feedback Systems Assigned: Session 8 Reports due: Session 13 in checkoffs Reading: Feedback system notes Chapter 6, Apex Evaluation Kit specs 1 Overview In this lab you will experiment with designing and stabilizing power op amp circuits. These devices are used to drive loads requiring significant power, such as motors, solenoids, deflection coils, speakers, etc. We will use two types of loads. The first is just a power resistor driven directly by the power op-amp. The second is an inductor driven in a closed- loop current-controlled mode. This second design will be implemented by using a second low-level op-amp to drive the power op-amp. You will need to model the system to design an appropriate controller. Then you will test this connection in the lab to measure its performance. You will design this low-level controller and build it on a section of the protoboard in your nerd kit. 2 Power Amplifier Connections Please read this section carefully before making any circuit connections, and before applying any power to the circuit. In this laboratory, we will take a closer look at the power amplifier that powered the servomotors in Laboratory 1. We study using this power op amp to drive loads requiring more power than is available from a low-level op-amp such as the 741 (which is limited to about 10 mA max output current). To this end you will work with an Apex PA-21 power operational amplifier mounted on their EK-21 evaluation board. Data sheets for this amplifier and for the evaluation kit are included with this handout. Please read these data sheets in order to familiarize yourself with the amplifier characteristics. Note: The most important datum on this sheet is that the amplifiers have an absolute maximum of ± 25 volts. Irreversable damage will occur above this level. The supplies in the lab can provide more than ± 30 volts and thus are capable of destroying the amplifier. Therefore, before shutting off or turning on the supply always set it to 0 volts on both sides. Referring to the EK-21 data sheet, we have installed only one of the two possible PA-21 units. In the installed PA-21, we will only use the A side. The B amplifier is left unconnected. On the A side, the following components have been installed: R 6 = R 7 = R 14 = 0 Ω (jumpers), R 1 = R 5 = 10 kΩ (gain setting resistors), C 5 = C 12 = 100 µ F (low-frequency bypass capacitors), and C 4 = C 11 =0 . 1 µ F (high-frequency bypass capacitors) All other components are omitted. Terminals 1 and 3 are brought out on green and red wires, respectively. The board ground plane is also brought out on a black wire for connection on the low-power side. On the high-power side, we have brought out the power supplies with + V cc on a red wire, V cc on a black wire, and common on an unisulated wire.
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This note was uploaded on 02/24/2012 for the course MECHANICAL 2.737 taught by Professor Davidtrumper during the Spring '99 term at MIT.

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lab2 - 2.737 Mechatronics Laboratory Assignment 2: Analog...

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