Q:What is the difference between the reactor and the capacitor?

Reactor is the inductance ah, usually magnetic components plus winding wound, storage of magnetic field energy, the capacitor is stored in the electric field energy.

Q:What is the electrolytic capacitor inside?

There are aluminum foil, paper (not the general paper), as well as electrolyte. There is polarity, then the explosion will explode.

Q:How does the capacitor work? What does it do?

Straight to pass on the circuit need to pass the AC signal, power supply filter, cut off DC and other places to use. Capacitor charge and discharge is the basis of other properties. There are two kinds of filtering, one is the power filter, which is more obvious charge and discharge, can be seen as a container.

Q:Does anyone know the difference between the stray inductance of the capacitor and the parasitic inductance?

This impedance can not be ignored in the presence of high frequency current, with particular note that the bypass capacitor needs to pass through the two vias when connecting the power plane and the formation so that the parasitic inductance of the vias is multiplied.

Q:What is the principle of capacitance isolation?

When the supply voltage rises in the reverse direction, the capacitor is charged in the reverse direction, and then the discharge is reversed. So the charge and discharge and the AC current is really the same, so the capacitor can pass the AC current.

Q:Use capacitance to do transformer how to calculate

Similarly, we can also 5W / 65V bulb and 1uF capacitor series connected to the 220V / 50Hz AC, the bulb will be lit, and will not be burned. Because the 5W / 65V bulb operating current is also about 70mA. Therefore, the capacitor buck is actually using capacitive current limiting. While the capacitor actually functions as a limiting current and dynamically distributes the voltage across the capacitor and the load.

Q:Why some Y capacitor is very small, and some Y capacitor is very large?

In line between the line of fire and zero line suppression capacitor, commonly known as X capacitance. As the location of the capacitor connection is also more critical, the same need to meet the relevant safety standards. X capacitance is also one of the safety capacitors. According to the actual needs, the capacitance value of the X capacitor is larger than the capacitance of the Y capacitor. However, it is necessary to connect a safety resistor in parallel with the X capacitor to prevent the charging and discharging of the power supply line.

Q:How to identify high voltage capacitors is good or bad

There is a series in 220v AC power inside, see if the light bulb can be normal light. Determine if the capacitor has capacity. Whether the initial test is normal.

Q:Why does the circuit current gradually decrease when charging the capacitor?

Why does the circuit current gradually decrease when charging the capacitor? Because the charge began to charge the capacitor, the capacitor two electrode plate charge began to zero, the electrostatic field is zero, the absorption of electrons is not exclusion, the performance of the phenomenon is the beginning of the charge when the circuit current is very large, with the capacitor The charging time increases, there will be more and more charge adsorption on the capacitor two electrode plates,

Q:Capacitance can pass high frequency resistance low frequency principle

In a cycle of alternating current, due to the positive and negative charge of the capacitor, the direction of the current flowing through the circuit is changed, but because of the repeated charge and discharge of the capacitor, the circuit will always have a current through, Can make the AC through, which is the capacitance of the communication characteristics.