Introduces the inductance stability of inductors

Inductance refers to the strength of the current that can be induced by the coil when it is active in the magnetic field, and the unit is "Henry" (H). Also refers to the application of this property made of components. Inductance is the electromagnetic induction characteristic presented by the inductor in the circuit! (including self-inductance and mutual inductance), the coil is an inductive element. Broadly speaking, inductance exists in the circuit, any component is not only the coil has inductance! In a sufficiently high frequency circuit, any component line will have an inductance effect. Correctly speaking, the coil is an inductor, and the main component of the inductor is the coil.

The electrical characteristics of inductors are the opposite of capacitors, "passing low frequency and blocking high frequency". High frequency signal through the inductor will encounter a lot of resistance, it is difficult to pass; The resistance presented by the low-frequency signal when it passes through is relatively small, that is, the low-frequency signal can pass through it more easily. The resistance of the inductor to direct current is virtually zero.

inductance

Resistance, capacitance and inductance, they will present a certain resistance to the activity of electrical signals on the circuit, this resistance we call "impedance". The inductor coil applies the self-inductance of the coil to the impedance presented by the current signal. Inductor sometimes we refer to it simply as "inductor" or "coil", represented by the letter "L". When winding an inductor coil, the number of turns of the coil we commonly call it the "number of turns" of the coil.

Inductor inductance stability

Stability is the level at which inductor parameters change with environmental conditions. The inductance temperature coefficient αL is usually used to assess the stability level of the coil, which represents the stability of the inductance relative to the tear degree, which is calculated with the following formula:

The temperature coefficient of inductance is mainly caused by the geometrical deformation caused by the contraction of coil wire after heat action. In order to improve the stability of the coil temperature, a hot winding method can be used to manufacture coils: the wire of the coil is wound with a current, so that the wire becomes hot and then wound the coil, which can make the coil shrink after cooling and stay close to the skeleton, no longer prone to deformation after heating, and improve the stability accordingly.

In addition to temperature, temperature can also cause changes in inductor parameters. For example, the increase in humidity will increase the spread capacitance and loss of the coil, which will reduce the stability of the coil. In order to avoid the influence of humidity on coil parameters, moisture-proof measures are usually taken when the inductor is manufactured, such as the use of epoxy resin packaging or stop dipping disposal.