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CSE 480 Fall 2003 Group 1 Even more ESCs and H-Bridges

CSE 480 Fall 2003 Group 1 Even more ESCs and H-Bridges. We tested the current draw on our servo and main motor: Max current servo = 0.3A Max current motor = 2A. Homemade Speed Controls. http://www.math.niu.edu/~behr/RC/speed-ctl.html

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CSE 480 Fall 2003 Group 1 Even more ESCs and H-Bridges

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  1. CSE 480 Fall 2003 Group 1Even more ESCs and H-Bridges • We tested the current draw on our servo and main motor: • Max current servo = 0.3A • Max current motor = 2A

  2. Homemade Speed Controls • http://www.math.niu.edu/~behr/RC/speed-ctl.html • “Most home-grown ESC plans are by design simple. This also means that they will be, as a rule, less reliable and more temperamental than commercial units. An ESC is supposed to detect pulses whose width is varying a little bit, and convert those variations to a big voltage swing which controls the FET. All this has to happen in a nasty environment: vibration, interference from the motor, etc. It isn't a trivial job. “ • A few designs in the German Magazine, ElektroModell.

  3. ESC using PIC Microcontroller ($??) http://homepages.paradise.net.nz/bhabbott/esc.html

  4. Homemade H-Bridge (no break) http://www.robotroom.com/HBridge.htm l • $1.60 1.5A, 8-DIP

  5. 5V 1k 1k REF IN PWM M 1k 1k Simple H-Bridge we built (3A)(untested)

  6. Zetex ZHB6718 H-Bridge ($3.70)

  7. Half-H/Full-H Drivers (~$2)

  8. Cont.

  9. Texas Instruments TPIC0107B ($4.28) • 5A, 2kHz • 20HSOP

  10. Motorola 33886 ($6.22) • 5.2A, 10kHz, 20HSOP

  11. Heatsink Small OutlinePackage (HSOP) • Our Prototype Board vs HSOP

  12. MC33886 Development Board ($50)

  13. Conclusions • Anyone else find ESCs and H-Bridge designs? • We could spend an entire semester just designing an ESC. • This doesn’t even include the circuitry for the sensors. • What level of abstraction should we use for sophomores? (Transistor level, IC level, ESC level)

  14. Trying to find the right balance for the sophomore design project. • CS portion is going to be decided on level of API abstraction. • CE portion is probably under 25% since we’re not designing a CPU from scratch. • Building a car from scratch could skew ME > 25% • Building an ESC from scratch could skew EE > 25%

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