Скачать или смотреть If you see this diode, never take it out of the circuit

A freewheeling diode is a protective component used in circuits containing inductors (such as relays, DC motors, and switching circuits). When the current in the inductor is suddenly interrupted, the inductor generates a high reverse voltage that can damage circuit components. The freewheeling diode, by conducting this reverse voltage, slowly discharges the energy stored in the inductor and prevents damage to the circuit. This diode is typically installed in parallel with the inductor and plays a vital role in protecting transistors, ICs, and other sensitive components. Choosing the right diode (with sufficient voltage and current ratings) and installing it close to the inductor ensures optimal circuit performance.
1. Freewheeling Diode Operation:
When the current in the inductor is interrupted, the inductor generates a high reverse voltage. The freewheeling diode conducts this voltage and prevents damage to the circuit.
2. Importance of Freewheeling Diode:
• Protects sensitive components (such as transistors and ICs).
• Increases the lifespan of the circuit.
• Improves the stability and performance of the circuit.
3. Choosing the Right Diode:
• The reverse voltage (PIV) of the diode should be higher than the source voltage.
• The forward current (IF) of the diode should be able to handle the inductive current.
• In fast applications, use fast recovery or Schottky diodes.
4. Common Applications:
• Relays: Protecting the control transistor.
• DC motors: Preventing reverse voltage from the windings.
• Switching circuits: Protecting power switches (such as MOSFETs).

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00:00 Why does an inductor resist the flow of current?
02:43 Example circuit of an inductor for current flow
03:56 Placing a diode for the voltage return path