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DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING DC – DC BUCK BOOST CONVERTER PROJECT OUTLINE DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING ➢Background ➢Project Goals/Objectives ➢Parts ➢Procedure ➢Results ➢References PROJECT DYNAMICS DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING ➢Research, Gathered parts, design, build and test the Buck boost converter. ➢Additions to the design: build the buck boost converter on breadboard. BACKGROUND DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING ➢ DC to DC Buck – Boost converters are electronic circuits which convert a voltage from one level to a higher or lower one. ➢ There are many topologies for designing a DC to DC converter. 1. Buck 2. boost 3. buck boost ➢ Advantages of Buck Boost Converter 1. It gives higher output voltage 2. Low operating duct cycle 3. Low voltage on MOSFETs BACKGROUND DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING ➢Buck Boost converters are used for: 1. Electronic devices such as electric vehicles 2. DC-Drive structures 3. Electric power 4. Machine tools 5. Distributed power supply systems 6. Fixed systems to extend battery life by minimizing power consumption PROJECT GOALS DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING ➢Design, build, simulate and demonstrate steps to build a Dc – Dc buck boost converter ➢Design spec input of 6v-30v, output 14V, current of 1A ➢Use an LT3758 chip to build buck boost converter BUCK THEORY DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING Vin > Vout • In the step down mode the input voltage is greater than the output voltage. • Current is less than the average output current. DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING • When the switch in the buck regulator is on, the voltage that appears across the inductor is Vin - Vout. • When the switch opens, current must still flow as the inductor works to keep the same current flowing. • With the switch open, the polarity of the voltage across the inductor has reversed and therefore the current through the inductor decreases with a slope equal to -Vout/L BUCK THEORY BUCK EXAMPLES DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING • Self-regulating power supplies. • Low-loss current sources to drive LED displays • Used as interface between battery and components in Notebooks. • Point-of-load converters in servers • Advanced telecom and datacom systems BOOST THEORY DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING • A Boost converter is a switch mode DC to DC converter in which the output voltage is greater than the input voltage. • When the switch is in the ON position, the inductor output is connected to ground and the voltage Vin is placed across it.. • When the switch is placed in the OFF position, the voltage across the inductor changes and is equal to Vout-Vin. DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING EXAMPLE BOOST • Regulated DC power supplies. • Regenerative braking of DC motors • Portable device applications • As switching regulator circuit in highly efficient white LED drives • Battery powered applications where there is space constraint to stack more number of batteries in series to achieve higher voltages. BOOST DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING The boost converter can be operated in two modes • a) Continuous conduction mode • b) Discontinuous conduction mode PARTS DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING ➢LT3758 ➢6 Resistors (2-100K, 1- 32.4K, 41.2k, 1-12.7k) ➢Oscilloscope 1- ➢Analogue discovery ➢2 Diodes ➢Breadboard ➢1 Mosfet ➢Wires ➢9 capacitors ➢Power supply 6v-30v ➢2 inductors ➢Multimeter LT3758 DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING ➢Wide Input Voltage Range: 5.5V to 100V ➢Current mode, DC-DC controllers which are capable of generating either positive or negative output voltages. ➢Operating Frequency 100kHz to 1MHz LT3758 DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING ➢ The fixed frequency, current-mode design results in steady operation over a wide range of supply and output voltages ➢ Minimum on-time is the smallest time duration that the LT3758 is capable of turning on the power MOSFET. ➢ In each switching cycle, the LT3758 keeps the power switch off for at least 220ns PROCEDURES DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING LT3758 PINOUT ➢VC (Pin 1) ➢SENSE (Pin 6) ➢FBX (Pin 2) ➢GATE (Pin 7) ➢SS (Pin3) ➢INTVCC (Pin 8) ➢RT (Pin 4) ➢SHDN/UVLO (Pin 9) ➢SYNC (Pin 5) ➢VIN (Pin 10) PROCEDURES DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING Duty cycle: DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING BUCK INPUT DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING BUCK OUTPUT DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING BOOST INPUT DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING BOOST OUTPUT CONCLUSIONS DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING • In conclusion, we were able to meet our project goal. • We learned key techniques, steps, procedures and parts used to build a buck boost converter using LT3758 REFERENCES DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING • LT3758. LINEAR TECHNOLOGY CORPORATION 2009: http://cds.linear.com/docs/en/datasheet/3758Afd.pdf • Buck-Boost Converters. Learn about electronics Power Supplies. Eric Coates 2017: http://www.learnabout-electronics.org/PSU/psu33.php • DC-DC Converter Tutorial. Maxim Integrated 2016: https://www.maximintegrated.com/en/app-notes/index.mvp/id/2031 QUESTIONS DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
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Running head: ABOUT DC-DC BUCK BOOST CONVERTER PROJECT

About DC-DC Buck Boost Converter Project
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ABOUT DC-DC BUCK BOOST CONVERTER PROJECT

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About DC-DC Buck Boost Converter Project
The project is about designing, building and testing of DC-DC buck booster converter. A
DC-DC buck booster converters are simply electronic circuits that transform voltage from a
given level to a level that is either lower or higher as compared with the original level. Among
the boost, buck and buck boost design topologies, the buck boost...


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