Chip capacitorIt is very common in our daily life and has a wide range of usesThe patch capacitor used in the coupling circuit plays a role in passing DC and isolating AC, and this type of capacitor used in the coupling circuit is usually called a coupling capacitor

So what is the coupling effect of capacitance?
Capacitive coupling refers to the transmission of AC signals from the upper level to the lower level, while also ensuring that they do not affect each other, which means cutting off the DC signal between the upper and lower lines. Because the two electrodes of the capacitor are insulated, they can absorb and release charges. Therefore, coupling capacitors can play a good coupling role

Chip capacitorWhy can AC current flow but DC current cannot flow?Originally, capacitors could store charges, but there was no new circuit inside them. Direct current could charge the capacitor. However, when the voltage at both ends of the Dafang SMT capacitor is the same as the resistance voltage, the circuit stabilizes and no current flows. The positive half cycle of alternating current charges the capacitor, and the secondary half cycle discharges the capacitor. This not only ensures that the entire circuit is always powered, but also ensures that there is no path or mutual influence between the two circuits, Such continuous charging and discharging is equivalent to a current flowing through a capacitor to form a path

The patch capacitor is generally electrodeless. In the access circuit, when the voltage of the circuit connected to the lead at one end rises, the charge gradually gathers, and when the voltage disappears, the charge near the electrode plate returns to the circuit. The same is true for the lead at the other end of the capacitor. As the voltage continues to rise and fall, the charge will continue to gather and release, and cooperate with the frequency conversion of AC, as if there is a current passing through, it is actually insulated inside the capacitor, It only achieves the effect of AC and DC isolation through its charging and discharging process.

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