The difference between wound inductance and stacked inductance

Let's learn about the difference between wound inductors and stacked inductors:

1、 Introduction to wound inductors

Wire wound inductors are suitable for power supply circuits and are widely used in micro TVs, LCD TVs, cameras, and more.

Characteristics of wound inductors:

1. Suitable for power supply circuits.

2. Surface adhesion type.

3. The appearance and dimensions comply with EIA standards, and different size specifications are available for selection.

4. Good soldering and heat resistance, suitable for general welding and reflow.

The effect of winding inductance:

The role of SMT wound inductors. Basic functions: filtering, oscillation, delay, notch, etc; Image explanation: "Direct current, resistance to alternating current" Detailed explanation: In electronic circuits, the inductor coil acts on the limited current of alternating current, and it can form high pass or low pass filters, phase-shifting circuits, and resonant circuits with resistors or capacitors; Transformers can perform AC coupling, voltage transformation, current transformation, and impedance transformation. The role of SMT wound inductors seems to be somewhat contradictory. As we have said, capacitors are connected to AC to resist DC, while inductors are exactly the opposite. Their function is to connect to DC to resist AC, which is not true! The direction and magnitude of the magnetic field generated by direct current passing through an inductor are consistent and do not change.

AC electricity changes positively and negatively, so the magnetic field also changes. Since going from positive (negative) to negative (positive) is a short time, assuming a positive potential first and continuously rising, the magnetic field around the inductor continues to increase and reaches its maximum. At this point, the potential begins to decrease. Due to the presence of a magnetic field around it, the inductor will convert the surrounding magnetic field into electrical energy, allowing electrical energy to maintain for a period of time. Conversely, the opposite is true, thus preventing the passage of AC electricity.

2、 Introduction to stacked inductors

Stacked inductors, also known as non wound inductors, are one of the types of inductors that are classified according to their different structures.

Stacked inductance characteristics:

1. Small external dimensions.

2. Closed circuit, no interactive interference, suitable for high-density installation.

3. Non directional and standardized automatic SMT installation appearance.

4. Excellent weldability and resistance, suitable for flow soldering and reflow soldering.

Application of stacked inductors:

At present, this product is widely used for noise elimination in input and output circuits on laptops, digital TVs, digital video recorders, playlists, hard drives, personal computers, and other general consumer and computer products.

3、 What is the difference between wound inductance and stacked inductance

The wound inductor is a product of miniaturization of traditional wound inductors, and the stacked inductor is made using multi-layer printing technology and stacked production process, with a smaller volume than the wound inductor.

Winding type inductor: Its characteristics include a wide range of inductance (mH~H), high inductance accuracy, low loss (i.e. high Q value), high allowable current, strong inheritance of manufacturing process, simplicity, and low cost; The shortcoming is that it is limited in further miniaturization. Ceramic core wound type chip inductors can maintain a stable inductance and a relatively high Q value at such high frequencies, thus occupying a place in high-frequency circuits.

Stacked inductor: It has good magnetic shielding, high sintering density, good mechanical strength, and is smaller in size compared to wound inductors, which is conducive to circuit miniaturization, magnetic circuit closure, and will not interfere with surrounding components, which is conducive to high-density installation of components; Stacked integrated structure, high reliability, good heat resistance, good weldability, regular shape, suitable for automated surface installation production. The shortcomings are low qualification rate, high cost, and small inductance, The Q value is small.

The difference between wound inductors and stacked inductors is that, overall, stacked inductors cannot see the wires, and stacked inductors have good heat dissipation ESR value is smaller

But the current resistance is smaller than the winding inductance. The cost is lower than that of wound inductors. The heat dissipation of wound inductors is not as good as that of stacked inductors, but they have high current resistance, The ESR value is higher.