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H-Bridge Demystified

Basic Theory: Ohms law. Power = Voltage * CurrentVoltage = Current * Resistance Examples:.5A * 10 ohms = 5v5v * .5A = 2.5 watts.5v / .05 ohms = 10a10a * .5v = 5 wattsPower = Current^2 * resistance. Basic Theory: Inductors. V = L * dI/dT- What does that mean???. Current rises indefinitely based upon inductance and voltage..

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H-Bridge Demystified

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Presentation Transcript

    1. H-Bridge Demystified Basic electronic theory How H-Bridges work Explain terminology Explain where the power goes

    3. Basic Theory: Inductors V = L * dI/dT - What does that mean???

    4. Basic Theory: Real Inductors Real inductors have resistance Current * resistance = voltage Eventually current levels out Strength of magnetic field + level of stored energy are proportional to the current.

    5. Basic Theory: Inductors What happens when switch is opened?

    6. Basic Theory: Inductors Diodes used to suppress arcing Recirculating currents dissipate slower

    7. Basic Theory: PMDC motor PMDC motors can be modeled as an inductor, a voltage source and a resistance. Torque is proportional to the current

    8. How H-Bridge works

    9. How H-Bridge Works

    10. H-Bridge: Synchronous Rectification

    11. H-Bridge Locked-Antiphase Pro: one line needed for forward/reverse Con: higher frequencies needed

    12. Locked Antiphase Voltage swings from +V to V No rectification needed Current ripple twice as large

    13. H-Bridge Examples

    14. H-Bridge Examples

    15. Demonstration Actual current flow & voltage charts Resistor Inductor (motor) No load Load (power delivered) Negative Load (Regenerative braking)

    16. H-Bridge/Inductor Demonstration

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