What is a flyback diode (freewheeling diode)?
1 Answer
A flyback diode, also known as a freewheeling diode, is a diode used in electrical and electronic circuits to provide a path for the current when an inductive load is switched off. Inductive loads include devices like motors, solenoids, and transformers. When an inductive load is energized, it stores energy in its magnetic field. When the power to the load is suddenly disconnected (turned off), this stored energy tries to maintain the current flow, causing a voltage spike in the circuit.
The flyback diode is connected in parallel with the inductive load, with its cathode (negative terminal) connected to the positive supply voltage and its anode (positive terminal) connected to the load. When the switch or relay that controls the load is turned off, the flyback diode provides a low-resistance path for the current to continue flowing. It allows the energy stored in the inductor to circulate in a loop, dissipating safely and gradually in the diode rather than causing a harmful voltage spike.
The primary purpose of the flyback diode is to protect the rest of the circuit from damage that could occur due to voltage spikes. These spikes can lead to component failure or interfere with the operation of other components. By providing a safe path for the inductive load's energy, the flyback diode prevents these problems and ensures the smooth and controlled operation of the circuit.
Flyback diodes are essential components in many circuits involving inductive loads, such as in motor control, relay circuits, and solenoid applications. They are relatively simple and inexpensive devices but play a crucial role in maintaining the overall reliability and longevity of the electronic system.
The flyback diode is connected in parallel with the inductive load, with its cathode (negative terminal) connected to the positive supply voltage and its anode (positive terminal) connected to the load. When the switch or relay that controls the load is turned off, the flyback diode provides a low-resistance path for the current to continue flowing. It allows the energy stored in the inductor to circulate in a loop, dissipating safely and gradually in the diode rather than causing a harmful voltage spike.
The primary purpose of the flyback diode is to protect the rest of the circuit from damage that could occur due to voltage spikes. These spikes can lead to component failure or interfere with the operation of other components. By providing a safe path for the inductive load's energy, the flyback diode prevents these problems and ensures the smooth and controlled operation of the circuit.
Flyback diodes are essential components in many circuits involving inductive loads, such as in motor control, relay circuits, and solenoid applications. They are relatively simple and inexpensive devices but play a crucial role in maintaining the overall reliability and longevity of the electronic system.