Single-phase Variable Frequency Switch Gear
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1 1 Single-phase Variable Frequency Switch Gear Department of Electrical and Computer Engineering Eric Motyl and Leslie Zeman Advisor: Professor Steven D. Gutschlag November 19, 2015
2 2 Outline Problem Description System Block Diagram Eric s Progress Leslie s Progress Conclusion
3 3 Problem Description Variable frequency drive Controls the speed of a three-phase AC motor by varying the frequency and voltage supplied to the motor [1] Design, build, and test single-phase variable frequency switch gear Use a user-selected input frequency between 1 and 60 Hz and generate an output voltage with a constant Volts/Hertz ratio Operate at an output voltage of 120 V AC with frequencies between 1 and 60 Hz
4 4 System Block Diagram Gate Drive Circuitry + VDC Frequency Select Input PWM Generation Controller Upper half PWM Lower half PWM DC-to-AC Voltage Inverter VDC Single-phase, Variable Frequency Output with Constant V/Hz Ratio
5 5 Eric Progress Work Accomplished Project Timeline Achievements Future Work
6 6 Subsystem Block Diagram Gate Drive Circuitry + VDC Frequency Select Input PWM Generation Controller Upper half PWM Lower half PWM DC-to-AC Voltage Inverter VDC Single-phase, Variable Frequency Output with Constant V/Hz Ratio
7 7 Work Accomplished Project Timeline Gantt Chart Achievements
8 8 Schedule TASK WEEK 29-Sep 6-Oct 13-Oct 20-Oct 27-Oct 3-Nov 10-Nov 17-Nov PERIODS Proposal Presentation Simulate PWM Controller Code PWM Generation Controller Progress Presentation Plan % Complete Actual Beyond % Complete Beyond
9 9 PWM Subsystem Block Diagram 15kHz Triangle Wave Frequency 1 60Hz Sine Wave Comparator Switched PWM
10 MATLAB 10
11 11 MATLAB Problem Encountered An increase in sine frequency effects the sample location in respect to time Solution Increase the frequency by changing how samples are taken
12 12 MATLAB Equation for finding the samples needed at a given frequency sample_rate = samples/frequency_out Samples = 150,000 Sample_rate = varying values
13 13 MATLAB Index time (sec) Triangle (15kHz) Sine (1Hz) Sine (2Hz) Sine (60Hz) E E E
14 14 MATLAB Solution index = i f s Where f s is the frequency 1 60Hz Where i is a count Where index is the location in the lookup table
15 15 MATLAB Index time (sec) Triangle (15kHz) Sine (1Hz) Sine (2Hz) Sine (60Hz) E E E
16 Amplitude 16 MATLAB Sine Waves Seconds Sine (1Hz) Sine (30Hz) Sine (60Hz)
17 Amplitude 17 MATLAB Comparison Graph Seconds Triangle Sine (1Hz) Sine (30Hz) Sine (60Hz)
18 18 Future Work Future Schedule Gantt Chart Atmel Studios
19 19 Future Schedule TASK WEEK 17-Nov 24-Nov 1-Dec 19-Jan 26-Jan 2-Feb 9-Feb 16-Feb PERIODS Code PWM Generation Controller Progress Presentation Testing Progress Presentation Plan Actual Beyond
20 20 Atmel Studios Lookup Tables LCD Keypad
21 21 Leslie s Progress Schedule Progress on gate drive circuitry and DC-to-AC voltage inverter Plan of action for future work
22 22 October 1 November 19 Plan % Complete TASK WEEK 1-Oct 6-Oct 13-Oct 20-Oct 27-Oct 3-Nov 10-Nov 17-Nov 19-Nov PERIODS Proposal Presentation Design Gate Driver Initial Testing of Gate Driver Design Inverter Initial Testing of Inverter Progress Presentation
23 23 Design of Gate Drive Circuitry Two 8-pin Avago HCPL-3120 chips 18 V supply High and low side drivers +VDC Gate Drive Circuitry Upper Half PWM High Side Driver Single-phase Output Lower Half PWM Low Side Driver - VDC
24 24 Initial Testing of Gate Drive Circuitry 5 V 18 V R Pullup 1 HCPL V o TTL Open Collector
25 25 Results of Initial Testing of Gate Drive Circuitry Output Input
26 26 Design of Gate Drive Circuitry and DC-to-AC Voltage Inverter 18 V 5 V 18 V R Load R Pullup 1 HCPL Rg IRF640 Switched PWM Open Collector
27 27 November 19 February 16 Plan % Complete TASK WEEK 19-Nov 24-Nov 1-Dec 19-Jan 26-Jan 2-Feb 9-Feb 16-Feb PERIODS Design Inverter Initial Testing of Inverter Testing Progress Presentation
28 28 Conclusion Future work Eric working on PWM Leslie working on the further testing Gate drive Inverter
29 29 Single-phase Variable Frequency Switch Gear Department of Electrical and Computer Engineering Eric Motyl and Leslie Zeman Advisor: Professor Steven D. Gutschlag November 19, 2015
30 30 Bootstrap Capacitor Arrangement for High Side Driver 5 V V V EE R Pullup 1 HCPL Rg To DC-to-AC Voltage Inverter Switched PWM Open Collector C BS Single-Phase Output
31 Gate Drive Circuitry 31
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