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Power Systems. Team Name: Common Ground. Team Leader. Cody Morr. Hardware Specialist. Justin Winterhalter. Kausthub Rao. Software Specialist. Greg Zick. Team Assistant. Overview. Problem Statement Hardware Requirements/concepts interface Software Design Code Summary References

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power systems

Power Systems

Team Name: Common Ground

Team Leader

Cody Morr

Hardware Specialist

Justin Winterhalter

Kausthub Rao

Software Specialist

Greg Zick

Team Assistant

overview
Overview
  • Problem Statement
  • Hardware
    • Requirements/concepts
    • interface
  • Software
    • Design
    • Code
  • Summary
  • References
  • Q&A
problem statement
PROBLEM STATEMENT
  • POWER SYSTEMS
    • Distributing proper voltage to various parts of the smart car
    • Monitoring battery life
hardware
Hardware
  • Battery - 7.2V Nickel cadmium
  • LM2940 or L4941 (5volt reg)
  • MCP1702 (3.3volt reg)
  • 2x 1kΩ
  • 10µF capacitor
batteries
Batteries
  • 7.2 Volt Nicad Batteries
  • 2400 mAh Capacity
  • Charger output is 400 mA
  • Full charge time 9hrs.
hitech multi charger
HiTech Multi-Charger
  • Smart Charger
  • Allows the batteries to charge faster
  • Monitors the temperature in the battery
  • Used in between races
  • Charge up to 4 batteries at once
lm2940 voltage regulator
LM2940 Voltage Regulator
  • 5 Volts @ Max 1 amp
  • Max input 26V
  • Reverse battery protection
  • L4941 (same)
  • Low dropout voltage
    • 0.5V @ IO = 1A
mcp1702 voltage regulator
MCP1702 Voltage Regulator
  • 3.3 Volt
  • Operation range
    • 2.7v-13.2v
  • Max out 250mA
  • Overtemperature Protection
  • Low Dropout Voltage
    • 625 mV typical @ 250 mA (VOUT = 2.8V)
battery status
Battery Status
  • Linear circuit that outputs a fraction of its input voltage
  • Using 2x 1kΩ
  • Vbatt ≤ 10
  • Vbatt ≤ 5
  • A to D converter
wiring
WIRING
  • From pin 1 (Vin) on motor driver connect:
    • 10uF capacitor
    • Both input pins of regulators
    • Vin of voltage divider
  • Connect grounds
  • Vout of voltage divider to PTD4
software
Software
  • Flowchart for Battery Status
slide14
CODE
  • GLOBAL VARIABLE AND DEFINES
  • #define VBATTMIN 300
  • int VBATT;
  • Void initalizeMCU()
  • FB_RGB_ENABLE;
  • FB_RGB_ON;
  • BATTERY FUNCTION:
  • voidBATCHECK(void)
  • {
  • ADCSC1 = 11; // start 11-bit ADC on PTD4
  • WAITFOR(ADCSC1_COCO); // wait for conversion complete (new technique)
  • VBATT = (((ADCR * 500)/1024));
  • if (VBATT < VBATTMIN)
  • {
  • FB_RGB_BLUE = 1;
  • FB_RGB_GREEN = 1;
  • FB_RGB_RED = 0;
  • motorDC = 0;
  • FOREVER
  • {
  • }
  • }
  • else
  • {
  • FB_RGB_BLUE = 1;
  • FB_RGB_RED = 1;
  • FB_RGB_GREEN = 0;
  • }
  • }
  • IN YOUR FOREVER LOOP:
  • BATCHECK();
  • printf( "Voltage of the batter is: %d \n", VBATT);
summary
SUMMARY
  • Problem Statement
    • DISTRIBUTING PROPER VOLTAGE TO VARIOUS PARTS OF THE

SMART CAR

    • MONITORING BATTERY STATUS
  • Hardware
    • Requirements/concepts
    • interface
  • Software
    • Design
    • Code
references
References
  • "250 MA Low Quiescent Current LDO Regulator." Microchip Technology Inc. Microchip Technology Inc., n.d. Web. 11 Mar. 2014.
  • "ALIMENTAZIONE." ALIMENTAZIONE. N.p., n.d. Web. 11 Mar. 2014.
  • "L4941 Very Low Drop 1A Regulator." STMicroelectronics, n.d. Web. 11 Mar. 2014.
  • "LM2940/LM2940C 1A Low Dropout Regulator." Texas Instruments. Texas Instruments, n.d. Web. 11 Mar. 2014.
  • "Nickel–cadmium Battery." Wikipedia. Wikimedia Foundation, 28 Feb. 2014. Web. 11 Mar. 2014.
  • "PDIP | ChipKIT Development Platform." ChipKIT Development Platform. N.p., n.d. Web. 11 Mar. 2014.
  • "Voltage Divider." Wikipedia. Wikimedia Foundation, 03 JulY2014. Web. 11 Mar. 2014.
  • MCF51JM128 Reference Manual
  • Notebook reference CET 335 lab 7 Analog to Digital Input