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

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

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 4.096 V). The outputs are also filtered by a LPF with cutoff frequency of 20 Hz.

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.

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.

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

Top and Bottom Layers MICROCONTROLLER POWER ANALOG

Top Layer

Bottom Layer

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