Functions of Capacitor on PCB

Functions of Capacitor on PCB

Capacitance is the electronic component that holds and releases electric charge. The basic principle of capacitance is charging and discharging,

Of course, there are rectifying, oscillating and other functions. In addition, the structure of the capacitor is very simple, mainly composed of two positive and negative electrodes and

The insulation medium sandwiched in the middle is composed, so the type of capacitance is mainly determined by the electrode and the insulation medium. There are many uses of capacitors, mainly as follows:

1. DC isolation: the function is to prevent DC from passing and let AC pass.

2. Bypass (decoupling): provide low impedance path for some components in parallel in AC circuit.

3. Coupling: as the connection between two circuits, it allows the AC signal to pass through and transmit to the next circuit

4. Filtering: This is very important for DIY. The capacitance on the graphics card is basically this function.

5. Temperature compensation: compensate for the influence of other components on the inadaptability of temperature, so as to improve the stability of the circuit.

6. Timing: the capacitor and resistor are used together to determine the time constant of the circuit.

7. Tuning: systematically tune frequency related circuits, such as mobile phones, radios, and televisions.

8. Rectification: turn on or off half closed conductor switch element at predetermined time.

9. Energy storage: storage of electric energy for release when necessary. For example, camera flash, heating equipment and so on. (today, the energy storage level of some capacitors is close to that of lithium batteries, and the power stored by a capacitor can be used by a mobile phone for one day.

Capacitance is a necessary component in board design, and its quality has become a very important aspect for us to judge the quality of board.

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