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Portable Function Generator and Power Supply - Project 1 | ECE 445, Study Guides, Projects, Research of Electrical and Electronics Engineering

University of Illinois - Urbana-Champaign Electrical and Electronics Engineering

Material Type: Project; Class: Senior Design Project Lab; Subject: Electrical and Computer Engr; University: University of Illinois - Urbana-Champaign; Term: Spring 2002;

Typology: Study Guides, Projects, Research

Pre 2010

Uploaded on 02/24/2010

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Title: Portable Function Generator and Power Supply

We selected this project in order to assist students in ECE lab courses in testing

and designing circuits outside of the laboratory. Enabling students to experiment with

ideas and explore their own creativity primarily motivates the production of this device.

Our product will give the students freedom of experimentation independent of the limited

laboratory time allotted in these lab courses.

Objective:

The goal of this project is to design and implement a portable function generator

and power supply for use in ECE lab classes such as ECE 110 and ECE 249. The

function generator will be used to test circuits outside of the laboratory where equipment

is not readily available. This device will also be easily movable from place to place for

convenience. Ultimately, the product should improve each student’s experience in

laboratory-oriented ECE courses.

Features:

- Power Supply and Function Generator in One Unit

- Standard and Variable Output Voltages

- Different Waveforms/Signal Types

- Built-in Safety Circuitry

- Wide Frequency Range

- Output Display for Frequency and Voltage

Benefits to End User:

- Portability

- Low-Cost, Affordable

- Diverse Functionality

- Fully Integrated System

- Ease of Use

Discover Study Guides, Projects, Research of Electrical and Electronics Engineering University of Illinois - Urbana-Champaign

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Title: Portable Function Generator and Power Supply We selected this project in order to assist students in ECE lab courses in testing and designing circuits outside of the laboratory. Enabling students to experiment with ideas and explore their own creativity primarily motivates the production of this device. Our product will give the students freedom of experimentation independent of the limited laboratory time allotted in these lab courses. Objective: The goal of this project is to design and implement a portable function generator and power supply for use in ECE lab classes such as ECE 110 and ECE 249. The function generator will be used to test circuits outside of the laboratory where equipment is not readily available. This device will also be easily movable from place to place for convenience. Ultimately, the product should improve each student’s experience in laboratory-oriented ECE courses. Features:

Power Supply and Function Generator in One Unit
Standard and Variable Output Voltages
Different Waveforms/Signal Types
Built-in Safety Circuitry
Wide Frequency Range
Output Display for Frequency and Voltage Benefits to End User:
Portability
Low-Cost, Affordable
Diverse Functionality
Fully Integrated System
Ease of Use

Block Diagram: Description of Blocks: Wall Power Supply:

- 120V (60 Hz) or 220V (50 Hz) AC Power for system - Switch selects between the two - Will implement only if can find cheap transformer capable of handling both input voltages. Step Down Voltage: - Transformer to step down high voltage to useable and safe voltage level

Waveform shaping to Convert AC to DC
Will serve as power to DC and function generator components
Interface between wall power and unit will include circuit breaker or fuse for equipment protection. Shutoff if amperage exceeds 10 Amps (i.e. There is some sort of short between wall power supply)

Other Features:

The remaining features of the supply not related to circuitry.
LED lights and displays
Logic analyzer pen
De-bounced switches Specifications: Output Voltages: +-5, +-12, +-15 V, and Variable Output Current Limit: Approximately 2A Frequency Range: ~1Hz to 100 KHz Distortion: 3 % Max for sinusoidal waveform (still researching what is considered good distortion and what is Achievable with low cost components) Testing Procedures: First, make sure the system turns on cleanly when plugged into the power outlet. Voltage spikes of any kind will not be tolerated. We should verify if the circuit breaker or fuse works by making sure it shutoffs when the unit exceeds 10 Amps. (This part of the circuit will be tested independent of the rest of the circuitry. This will ensure that the destruction of project circuitry does not result from failure of protection circuitry). Testing of the functionality of the power supply can be accomplished through multi-meter measurements. Voltage of the DC sources should remain constant through varying current demands up to the maximum allowable current.. We will check if the +/- 5, 12, and 15 V is outputting the corresponding voltage through 0 – 2A loads. In addition, check the variable DC output is changing equivalently (and linearly) when turning the knob to the multi-meter. Next, we test the function generator by hooking it up to the oscilloscope. The output should correspond to the selected frequency, wave, and amplitude. Testing will be done to make sure the device is capable of producing signals with frequencies within the range of 1 Hz to 100 KHz. After that, there must be confirmation that the internal circuitry protection operates correctly. For example, the short protection and current limiting between terminals, reverse voltage protection, and grounded chassis all function. Then, we should check the remaining features like the logic analyzer, de-bounced switches, and LEDS.

Tolerance Analysis: The function generator is the most important system of our unit. We shall set the maximum frequency at 100 KHz, set the minimum frequency at 1Hz, and test the output on the oscilloscope. The waveforms need to have low distortion (i.e. a couple of percent at most throughout the entire frequency range). Duty cycle needs to remain constant at or near 50% throughout the variable frequency range. The voltage of the output must remain nearly constant for varying loads. Of secondary importance is the DC output. It must also be shown to have a stable voltage with varying loads. Cost and Schedule: Cost Analysis:

Labor: ($29/hr) (1 person)(90 hrs)* 2.5 = $ 6525 per person Total Labor: (3 people)*($6525/person) = $19,
Parts: IC’s and Chips - $ Misc. Analog Circuit Components - $ Machine Shop/PCB Fabrication (if needed) - $ Total Parts: $30 + $70 + $100 = $
Total Cost: Labor and Parts = $19, Schedule: Beginning Week of 2/11/02: Week 1-2: Design Trials and Tests for Circuitry in PSpice. Phil: Determine/Order Parts Suketu: PSpice simulations Ryan: PSpice simulations Week 3-4: Assembly of Analog Circuits and Blocks Phil: Waveform Generation Suketu: Power Generation Ryan: Display and User Interface Week 5: Testing and Integration of System Components Phil: Test Waveform Generation Suketu: Test Power Generation Ryan: Test Display and User Interface

Portable Function Generator and Power Supply - Project 1 | ECE 445, Study Guides, Projects, Research of Electrical and Electronics Engineering

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