What Is a Flyback Inductor?

Flyback (Flyback Switching Power Supply) refers to a switching power supply that uses a flyback high-frequency transformer to isolate the input and output circuits. The corresponding one is a forward switching power supply.

[fn j] Come on!

Flyback (Flyback Switching Power Supply) refers to the use of flyback

Stimulate with irony. Mao Dun's "Midnight" 10: "He repeatedly, again and again, with encouragement and flyback; he is a bit angry, but Du Zhuzhai's idea is unbreakable."

"Fly back" specifically refers to when the switching tube is turned on, the output transformer acts as an inductor, and the electrical energy is converted into magnetic energy. At this time, there is no current in the output circuit. On the contrary, when the switching tube is turned off, the output transformer releases energy and magnetic energy. Converted into electrical energy, there is current in the output circuit.

In the flyback switching power supply, the output transformer also serves as an energy storage inductor. The entire power supply is small in size and simple in structure, so it is widely used. The most widely used are single-ended flyback switching power supplies.

Advantages: few components, simple circuit, low cost, small size, can output multiple isolated voltages at the same time

Disadvantages: switch tube withstands high voltage, low output transformer utilization, unsuitable for high power EMI

Generally speaking, switching power supplies within 100W usually use single-ended flyback, switching power supplies over 100W-300W usually use forward or half-bridge, and power supplies above 300W usually use full-bridge.