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Microcontroller Based Power Converter

Microcontroller Based Power Converter. Group 12 Keith Kocek Ankit Gupta 12/02/2011. Introduction. Converts an input voltage to a specific output voltage Operates without an external power source Expandable and modular design. Features. Digitally Programmable DC-DC converter

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Microcontroller Based Power Converter

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  1. Microcontroller Based Power Converter Group 12 Keith Kocek Ankit Gupta 12/02/2011

  2. Introduction • Converts an input voltage to a specific output voltage • Operates without an external power source • Expandable and modular design

  3. Features • Digitally Programmable DC-DC converter • Programmable current limit option • Wide range of input with Buck/Boost topology • Externally controllable • Via Reference Voltage

  4. DC-DC Voltage Converter

  5. High-Level Diagram UI/UO 10 lines 5 lines 2 lines Vin Sensor Microcontroller V/I out Sensor On/Off Relay Vin-5V Vin-Variable Vout FB network Vin(6-33V) Protection 5V-31V

  6. System Overview • Hardware: • Vin-Variable Vout (Buck/Boost converter) • Vin-7V Buck/Boost Converter • 5-30V DC/DC Converter • Feedback Network (Digital Potentiometers) • Current Sensor/Relays • Software: -- Microcontroller (Arduino Nano) -- LCD Screen/Keypad Interface -- Voltage Sensor(In/Out)

  7. Buck/Boost Converter (LT 3789) • Steps Up/Down Voltage • Wide Vin Range: 4V to 38V • 1% Output Voltage Accuracy

  8. 7V Buck/Boost Converter (LT 3343) • Powers the Microcontroller, Relay

  9. DC/DC Converter(LT 1316) • Boost Topology • Outputs 30V for Feedback Network

  10. Current Sensor/Relay • Dual Operational Amplifier (LM 2904) • Utilizes series resistor to measure current • ON/OFF Relay

  11. Feedback Network • Two Digital Potentiometers (AD 5290) • 100 k-ohm • 3-wire Serial Peripheral Interface • 256 bit resolution • Digital control of feedback

  12. Microcontroller (Arduino Nano) • Recommended Input Voltage: 7-12 V • Powered by Mini-B USB or 7V supply • 14 – Digital I/0 Pins ( 6 provide PWM output) • 8 – Analog Input Pins • SPI Communication Supported

  13. LCD Screen/Pushbuttons • Lumex S01602D • 16x2 Character Display • 8 Data Bits • Pushbuttons • 6buttons • Allows user interaction

  14. Software • Resistive Divider Network • Displaying to the LCD Screen • User Input/Visual Output • START Button • Feedback Network

  15. Testing Procedure • Vin Protection • Lock-out Reverse Voltage • Block Voltage greater than 33V • Vin fused to protect Vin source • Vin/Vout Sensor • Vin/Voutmeasurement should be correct • Microcontroller • It should operate the circuit. • Output to LCD • Set FB Network

  16. Testing Procedure • Vin-Variable Vout • Vout should be within 1% of the specified output range of 1V-30V • 5-30V • Vout should be 30V, 1%. • Vin-7V • Vout should be 7V, 1% over the 6V-30V range.

  17. Vin-Variable Vout Extreme Tests Buck/Boost- 6Vin Boost Region Buck region

  18. Vin-Variable Vout Extreme Tests Low-Low Low-High High-Low

  19. Vin-7V Tests 5.5V Input 21V Input

  20. 5V-30V Tests 5V-30V Test

  21. Feedback Network • Adjusted Wiper Resistances • Communication with Two Digital Potentiometers • Not robust with the power supply Vin Protection

  22. Current Sensor/Relays

  23. Vin/Vout Sensor

  24. Why do you need it? • Doesn’t require external power source • Simple two-input and two-output device • Enables the use of other devices • Save Time. Save Money.

  25. Questions? • Snubbing Circuit • Digital Potentiometers

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