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A COMPACT 400W SINGLE PHASE INVERTER
Senior Design II
Mid-Semester Presentation
Single Phase Inverter Team Members
Team LeaderElectrical Engineer
• Control System Design• Power Electronics• Programming• Website
Electrical Engineer
• Output Filter Design• Hardware Implementation• Power Electronics
Electrical Engineer
• Output Filter Design• Programming• Enclosure• Website
Electrical Engineer
• Hardware Implementation• Enclosure• Control System Design
Christopher Burge
Michael Robertson
Johnny Reed
Bret Hariel
Faculty Advisor: Dr. Masoud Karimi
Outline
Problem Solution Technical Constraints Practical Constraints System Overview Design Refinements Testing Plan Packaging Timeline Questions
Example of an inverter used to connect a distributed resources to a load
Problem
Adaptability of system components to change in distributed resource system parameters
Solution
An inverter which is capable of accepting variable DC inputs
Technical Constraints Name Description
Voltage Regulation
The voltage must stay within a 10% range centered on 120V.
Efficiency This device must have an efficiency greater than 95%
Total Harmonic Distortion
The THD must be less than 5%
Power Rating The device must be able to deliver 400W
Input Voltage Range
The device must be able to output a voltage of 120V with an input range from 200 to 300VDC
Practical Constraints
Type Name Description
Environmental Enclosure The inverter enclosure must be weather proof from sun and rain.
Manufacturability Size The inverter must be compact and weight less than 25lbs.
System Overview
DC Source
Output Filter Load
Voltage Sensor
Microcontroller
Power Electronic
Circuit
Control to Power Isolated
Interface
Design Refinement
Improvements
Voltage Sensing Circuit DC Source Replacement
DC Source Replacement
Buck Converter VLA106-24151 DC/DC 24V to15V UA78L00 15V to 5V DC Regulator TLE2426 to obtain -15V DC
Buck Converter Purpose:
To supply power to all the elements that are not in the power electronic circuit
Challenge:
How to supply power to the MOSFET of the buck converter on start up
Solution:
Put a passive component circuit in parallel with the buck converter to supply microcontroller power
Schematic of Buck Converter
Additional DC/DC Regulators
Purpose:
To supply all power from a single source
VLA106-24151 DC/DC 24V to15V UA78L00 15V to 5V DC Regulator TLE2426 to obtain -15V DC
Voltage Sensor Circuit (old)
Problem
High power loss in the voltage divider and additional voltage buses
Voltage Sensor Circuit (new)
Solution
A sensor network that requires less power and a less diversity of voltage buses
Product Testing
Power Quality, Voltage Regulation, and Efficiency
Power Quality:
The THD must be less than 5%
Voltage Regulation:
The device must be able to output a voltage of 120V with a no more than a 10% deviance regardless of the load within our operating range
Efficiency:
This device must have an efficiency greater than 95%
Power Quality, Voltage Regulation, and Efficiency
Power Quality:
Using the Fluke 43B Power Quality Analyzer we will measure the total harmonic distortion
Voltage Regulation:
Using the Agilent DSOX302A4 Oscilloscope we will monitor the output voltage and compare it to a central tendency value of 120V
Efficiency:
Using the Fluke 43B Power Quality Analyzer we will measure the output power and compare it to the input power of the Sorensen XHR 600-1.7 DC source.
Voltage Regulation Load Expected
Output VoltageExpected THD
R = 600 120.35V 1.24%
R = 200 120.33V 1.43%
R = 150 120.35V 1.01%
R = 100 120.55V 1.93%
R = 250 120.28V 0.87%
R = 100, L = 250µ 120.54V 1.94%
R = 100, L = 500µ 120.54V 1.94%
R = 100, L = 1m 120.73V 2.83%
R = 100, C = 5µ 120.37V 1.29%
R = 100, C = 10µ 120.40V 0.5%
R = 100, C = 20µ 120.50V 1.54%
R = 100, C = 10µ, L = 500µ 117.88V 0.7%
Variable DC InputThe output voltage must stay within a 10% range centered on 120V.
Test Conditions:
Test 1: Vary the input power of the Sorensen XHR
600-1.7 DC source from 200V to 300V
Test 2: Vary the input power of the Sorensen XHR
600-1.7 DC source from 300V to 200V
Results: Output remains within voltage regulation
constraint
Max Power Rating
The device must be able to deliver 400W
Test Conditions:
Three 100Ω power resistors placed in parallel to give a total of 33Ω to draw 400W to the load
Results: Pass Fail
PCB&
Packaging
PCB
PCB Design Software Options:Cadence OrcadEagle
PCB Design Choice: Eagle 5.11 Professional
Customizable libraries and ease of making parts
PCB Schematic
Microcontroller
Interface Circuit
Power Electronic CircuitDC Source
Voltage Sensor
Load
PCB Layout
6”
10”
Enclosure Requirements
ManufacturabilityMust exceed 10”x 8”x 4”Must weigh less than 15lbs
EnvironmentalMust be NEMA 3R
Enclosure Options
12”x 10”x 5” 13.45”x 11.83”x 6.31”
8.25lbs $180
6lbs$86 [1] [2]
Timeline
January February March April
Voltage Feedback
Design Refinement
PCB Design
PCB Implementation
Enclosure
References[1] L-com Global Connectivity. 12X10X Inch 120 VAC Vented Weatherproof Enclosure. Available: http://www.l-com.com/item.aspx?id=31421
[2] Automation Direct. Premier (6in. X 6in. to 16in. X 14in.). Available: http://www.automationdirect.com/adc/Shopping/Catalog/Enclosures/Non-Metal_%28NEMA_4X_-a-_3R%29/Premier_%286_in._X_6_in._to_16_in._X_14_in.%29
A COMPACT 400W SINGLE PHASE INVERTER
Senior Design II
Mid-Semester Presentation
Questions?