1. Maximum Power Point Tracker
Group 12 – H.E.A.D. Gear
Maximum Power Point Tracker
Technical Communication Skills Practicum Presentation
Block Diagram
Schematic Overview
PCB Layout Overview

2. Maximum Power Point Tracker
Group 12 – H.E.A.D. Gear
Maximum Power Point Tracker
CAN Transceiver
Analog Block 2 5
Serial Communication
(Debugging) 2
Power Block
Micro
Controller 5
Programming Port 3
Analog Block: INPUT_I, OUTPUT_I, INPUT_V, OUTPUT_V, TEMPERATURE
Power Block: 4V096, 5V, GND (3X)
CAN Address: ADDR0, ADDR1, ADDR2, ADDR3
Clock: OSC1, OSC2
CAN Transceiver: CANRX, CANTX
Serial Communication: RX, TX
Programming Port: nMCLR, PGC, PGD
Outputs: ERROR, STATUS, MOSFET_SIG, RELAY_CONTROL, FAN_SUPPLY
CAN Address 4
Outputs
Clock 2 5

3. Maximum Power Point Tracker
Group 12 – H.E.A.D. Gear
Maximum Power Point Tracker
Analog Block:
INPUT_I and INPUT_V are the solar array current and voltage respectively.
OUTPUT_I and OUTPUT_V are the solar car battery current and voltage respectively.
TEMPERATURE is the temperature in the DC/DC converter board (power board).
Analog circuits are summing op amps used to translate the input voltages to the voltage range of the microcontroller (0 to V). The outputs are also filtered by a LPF with cutoff frequency of 20 Hz.

5. Maximum Power Point Tracker
Group 12 – H.E.A.D. Gear
Maximum Power Point Tracker
Outputs:
MOSFET_SIG – PWM signal that controls DC/DC converter.
RELAY_CONTROL – signal that controls connection between solar array and board. If solar array’s voltage exceeds 70 V, board will be disconnected from it thru relay.
FAN_SUPPLY – signal that turns fan on and off, triggered by board temperature.
ERROR and STATUS – are diagnostic LEDs. These LEDs will provide visual indication of operation.

6. Maximum Power Point Tracker
Group 12 – H.E.A.D. Gear
Maximum Power Point Tracker
CAN Address:
ADDRx – 4 bits that set CAN address. These bits are set by a DIP switch.
CAN Transceiver:
CANRX and CANTX – receive and transmit signals connected to CAN transceiver.
Serial Communication:
RX and TX – connected to debugging header.
Programming Port:
nMCLR, PGC, PGD – connected to programming header.

8. Maximum Power Point Tracker
Group 12 – H.E.A.D. Gear
Maximum Power Point Tracker
PCB Layout

9. Top and Bottom Layers
MICROCONTROLLER
POWER
ANALOG

10. Top Layer

11. Bottom Layer

12. Rats Nest