The cause of the short circuit and leakage fault of the patch capacitance (I)

The impact of the patch capacitance short circuit is different from the leakage in different circuits. For example, the DC current will flow directly to the next level after the short circuit of the coupling circuit, and the current is the noise, while the filter capacitor may fuse the fuse when the filter capacitance is penetrated.

This has to be said from the structure of the capacitor. The simplest capacitor is made up of two ends of the polar plate and the middle insulating dielectric (including air). After electrification, the plate is electrified to form a voltage (potential difference), but because of the insulating material in the middle, the whole capacitor is not conductive. However, this situation is not in excess of the critical voltage (breakdown voltage) of the capacitor. We know that any substance is relatively insulated. When the voltage at both ends of the material increases to a certain extent, the material can be conductive, which we call the breakdown voltage. Capacitors are no exception. Capacitors are not insulators after breakdown.

In the middle school, however, the voltage of the axial capacitance can not be seen in the circuit, so it works below the breakdown voltage and can be seen as an insulator. However, the axial capacitance is in the AC circuit because the direction of the current varies with time. The process of charging and discharging of capacitors is time. At this time, a changing electric field is formed between the plates, and the electric field is also a function of time variation. In fact, the current is passed through the capacitor between the fields.