The role of chip inductors
Chip inductors, also known as power inductors, high current inductors and surface mount high power inductors. It has the characteristics of miniaturization, high quality, high energy storage and low resistance.
Chip inductors are electromagnetic induction components wound with insulated wires. It is a commonly used SMD electronic component. The function of the chip inductor: to isolate the AC signal, filter or form a resonant circuit with capacitors, resistors, etc.. Tuning and frequency-selective inductors: the inductor coil and the capacitor can be connected in parallel to form an LC tuning circuit. Any current of the chip inductor in the circuit will generate a magnetic field, and the magnetic flux of the magnetic field will act on the circuit.
When the current passing through the chip inductor changes, the DC voltage potential generated in the chip inductor will prevent the current from changing. When the current passing through the inductor coil increases, the self-induced electromotive force and electricity generated by the inductor coil. When the current passing through the inductor coil decreases, the self-induced electromotive force is in the same direction as the current, preventing the current from decreasing and releasing the stored energy at the same time. Compensation for the decrease in current. The flow direction is opposite to prevent the increase of current, and at the same time, part of the electric energy is converted into magnetic field and stored in the inductor; therefore, after the inductance filtering, not only the pulsation of the load current and voltage is reduced, the waveform becomes smooth, and the rectifier diode is turned on. The angle increases.
The general chip inductors are not shielded in the circuit, and the inductance in the circuit can not achieve the desired effect when used, and the shielded chip inductors can shield some current instabilities in the circuit, which is very effective. In order to block, the metal shield with complete shielding inductance will surround the positively charged conductor, and the negative charge equal to the charged conductor will be induced on the inside of the shield, and the positive charge equal to the charged conductor will appear on the outside. If the metal shield is grounded, the positive charge on the outside will flow into the ground, and there will be no electric field on the outside, that is, the electric field of the positively charged conductor is shielded in the metal shield.
The shielding inductance also plays a role of coupling in the circuit. In order to reduce the coupling interference voltage of the alternating electric field to the sensitive circuit, the inductance can be set up with a metal shielding body with good conductivity between the interference source and the sensitive circuit. The metal shield is grounded. The coupling interference voltage of the alternating electric field to the sensitive circuit depends on the product of the alternating electric field voltage, the coupling capacitance and the ground resistance of the metal shield. As long as the metal shield is well grounded, the coupling interference voltage of the alternating electric field to the sensitive circuit can be reduced. The electric field shielding is mainly based on reflection, so the thickness of the shielding body does not need to be too large, and the structural strength is the main consideration.