1 / 25

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

zaynah
Télécharger la présentation

Microcontroller Based Power Converter

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related