What is an I-shaped inductor?
I-shaped inductors are generally composed of magnetic cores, windings, outer sleeves and other materials. They have the characteristics of high power, high magnetic saturation, low impedance, high Q value, small distributed capacitance, and are used in many power products.
The magnetic core of the I-shaped inductor is often made of nickel-zinc material, which has strong insulation ability. Without the help of other isolation carriers, the enameled wire can be directly wound on the magnetic core, which directly reduces the volume of the inductor.
I-shaped inductors can be easily customized and the cost is not high. Its plug-in structure can also be selected horizontally or vertically, which is relatively easy to install. The outer heat shrink sleeve avoids direct contact between the inductor and the surrounding components, which greatly meets the customer's high-density device installation needs.
From the design point of view, the outer core shielding cover can also be added to the outer periphery of the I-shaped inductor to meet the customer's high standards for EMI.
In addition to the common I-shaped inductors with two guide pins, it is also easy to see three-leg I-shaped inductors. However, unlike the function of the two-leg I-shaped inductor, the three-leg I-shaped inductor is often used as a boost inductor. The working principle of the boost inductor is mainly based on the self-inductance phenomenon of the inductor, that is, when current passes through the inductor, a magnetic field will be generated around it, and this magnetic field can generate voltage.
In the boost circuit, the main function of the boost inductor is to increase the low voltage signal to a higher voltage signal. When the switch tube is closed, the inductor starts to charge and store magnetic field energy. When the switch tube is disconnected, since the current cannot change suddenly, the magnetic field energy in the inductor is converted into electric potential and superimposed on the input power supply voltage, thereby achieving a voltage increase. By controlling the duty cycle of the switch tube, the output voltage can be adjusted.