Industrial Electronics and Diode Applications

Introduction

• Presenter: Nanubu FI
• Topic: Industrial electronics focusing on diode applications.
• Key concepts: Diode operation, primary and secondary voltages, half-wave and full-wave rectifiers.

Diode Allocations

• Primary Side Voltage (VAC): Example given as 20 volts.
• Secondary Voltage Calculation: Based on turns ratio (e.g., 10:2:1).
  • Step down example: 20V to 5V or 10V.
  • Secondary voltage measured across secondary windings.

Diode Operation

• Forward Bias Mode: Diode acts as a conductor.
• Reverse Bias Mode: Diode acts as an insulator.
• AC to DC Conversion: Using diodes in rectifiers.

Half Wave Rectifier

• Purpose: Convert AC to DC.
• AC Characteristics: Alternating current changes direction.
• DC Characteristics: Direct current flows in one direction.
• Transformation Process:
  • Input signal (e.g., sine wave) => Step down voltage => Apply to rectifier.
  • Output: One directional flow, positive cycles remain.
• Operation:
  • During positive cycles, diode conducts.
  • During negative cycles, diode blocks current.

Full Wave Rectifier

• Using Two Diodes (D1, D2):
  • Positive Half Cycle:
    • D1 conducts (forward bias), D2 blocks (reverse bias).
    • Generates positive half wave.
  • Negative Half Cycle:
    • D2 conducts (forward bias), D1 blocks (reverse bias).
    • Negative half wave is inverted to positive.
• Output: Continuous positive half cycles, no negative half cycles.

Important Concepts

• Secondary Voltage Importance: Calculated using turns ratio; crucial for rectifier function.
• Diode Functionality in Circuits:
  • Allows current in one direction.
  • Blocks current in opposite direction.
• Rectifier Output:
  • Half-wave: Positive half waves.
  • Full-wave: All waves converted to positive.

Conclusion

• Understanding diode applications in rectifiers is crucial for efficient AC to DC conversion.
• Correct calculation and application of primary and secondary voltages aid in achieving desired outputs.