What is a flyback diode, its structure, principles, functions, types, operational procedures, and development history 1

A freewheeling diode is a semiconductor device with bidirectional conduction characteristics, also known as a capacitor diode or reverse-parallel thyristor. It is typically connected in parallel with switching transistors such as the AT24C04BN-SH-T or other power devices in a circuit to eliminate reverse high-energy pulses and prevent reverse breakdown, thereby enhancing system stability and reliability. Its primary function is to provide a controlled conduction path in AC circuits for precise current regulation. Below is a detailed explanation of the freewheeling diode:diode

1. Structure:

The structure of a freewheeling diode is similar to that of a regular diode, primarily composed of P-type and N-type semiconductors connected via a PN junction. However, its unique design enables it to withstand high reverse voltage. These diodes are typically made from silicon material, as silicon diodes exhibit higher voltage tolerance and lower forward voltage drop.diode

II. Principle:

The working principle of a freewheeling diode is based on the unidirectional conductivity of a PN junction. When an inductive load is operating, the freewheeling diode is connected in reverse parallel across the load. During normal circuit operation, the diode remains in a reverse-blocking state and does not interfere with the circuit's function. However, when the circuit is interrupted, the high reverse voltage generated by the inductor causes the diode to rapidly transition into conduction, forming a loop that safely dissipates the inductor's current. This protects the circuit from damage.diode