What is the role of the patch inductance in the PCBA proofing patch
- 2020-01-30-

The chip inductor used in the PCBA proofing chip is an electromagnetic induction element wound with insulated wires. It is a commonly used inductive component. The function of the chip inductor: It is simple to say that the AC signal is isolated, filtered or capacitors, resistors, etc. form a resonant circuit.

The role of tuning and frequency-selective inductance: the inductance coil and the capacitor in parallel can 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 PCBA proofing 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 and the current direction are the same, 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 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 effect of PCBA proofing chip inductors is different from the general chip inductors. The general chip inductors are not shielded in the circuit. After using them, the inductors in the circuit cannot achieve the desired effect, and the chip inductors can shield some The instability of the current in the circuit plays a good role in blocking. The metal shield with complete inductance surrounds the positively charged conductor. On the inside of the shield, the same amount of negative charge as the charged conductor will be induced, and the outside will appear. If the metal shield is grounded with the same amount of positive charge as the charged conductor, 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 positive conductor is shielded in the metal shield.