EE 647 Digital Signal Processor DSP Based Control of Electric Machines and Drives Laboratory - PowerPoint PPT Presentation

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EE 647 Digital Signal Processor DSP Based Control of Electric Machines and Drives Laboratory

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Purpose: Used to separate the power supplies of the microcontroller and the relays ... fluctuation in the relay circuit that may get linked to the logic power supply ... – PowerPoint PPT presentation

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Title: EE 647 Digital Signal Processor DSP Based Control of Electric Machines and Drives Laboratory


1
EE 647 Digital Signal Processor (DSP) Based
Control of Electric Machines and Drives
Laboratory
  • Laboratory Experiment 2
  • Lecture Part

Course Supervisor Prof. Ali Keyhani Lab
Instructor Sachin Puranik
2
Digital Interfacing- Relays and Switches
  • Objective Utilize GPIO ports of 2407 EVM to turn
    on or off AC light bulbs using relays
  • Read digital data from DIP switches

3
Circuit Configuration
  • Optocoupler Interface Circuit Board
  • A Hex Inverter Buffers (7406)
  • Six Optocouplers (4N35)
  • Purpose Used to separate the power supplies of
    the microcontroller and the relays

4
Optocoupler Interface Circuit Board
  • To avoid the large load current fluctuation in
    the relay circuit that may get linked to the
    logic power supply

5
Relays and Lamps Box
  • Relay Rating 12 Vdc, 30 mA, SPDT (with contact
    rating 10A, 125Vac)
  • Lamp Rating 25 watts, 115Vac

6
Pin Multiplexing and GPIO Overview
  • Need of Multiplexing
  • - GPIO pins are limited in
  • Two functions are multiplexed onto most pins
  • Each pin Primary or Secondary Function

7
Pin Multiplexing and GPIO Overview
  • GPIO pins are grouped in sets of eight pins
    called ports (A-F)
  • What controls pins Primary / Secondary
    functionality?
  • Ans MCRX - MUX Control Register (16-bit register)

8
Pin Multiplexing and GPIO Overview
  • Write 1 to corresponding bits for primary
    function
  • Write 0 for secondary function

9
Pin Multiplexing and GPIO Overview
  • When in GPIO mode, what controls the direction ?
    (Input or Output)
  • Ans PxDATDIR Port Data and Direction Control
    register (16-bit register)

10
Pin Multiplexing and GPIO Overview
  • MSBs Control the direction (input or output)
  • LSBs Pin data
  • (1-output, 0-input)

11
DIP Switch Board and EVM Connection
12
Relay Interface Circuit and EVM Connection
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