The main role of Y capacitor

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The main role of Y capacitor

The capacitor neither generates nor consumes energy and is an energy storage component. Capacitors are important devices for improving power factor in power systems; they are the main components for obtaining oscillation, filtering, phase shifting, bypassing, coupling, etc. in electronic circuits. There are many uses for capacitors, mainly as follows:

1. Filtering function: In the power supply circuit, the rectifier circuit turns the alternating current into a pulsating direct current, and after the rectifier circuit is connected to a larger capacity electrolytic capacitor, the charging and discharging characteristics are used to make the rectified pulsating DC voltage become Relatively stable DC voltage. In practice, in order to prevent changes in the supply voltage of each part of the circuit due to load changes, there are typically tens to hundreds of microfarads of electrolytic capacitors at the output of the power supply and at the power input of the load. Since the large-capacity electrolytic capacitor generally has a certain inductance, the high-frequency and pulse-interference signals cannot be effectively filtered out, so a capacitor with a capacity of 0.001--0.lpF is connected in parallel at both ends to filter out the high-frequency. And pulse interference.

The raging river flows into the lake and lets it flow out. It seems calm and soft. The capacitor acts as a lake, making the current purer and no clutter.

2. Coupling: As a connection between two circuits, the AC signal is allowed to pass through and be transmitted to the next stage circuit. In the process of transmission and amplification of low-frequency signals, in order to prevent the static working points of the two-stage circuit from interacting with each other, capacitor coupling is often used. In order to prevent the loss of the low frequency component of the signal in the signal, the electrolytic capacitor with a large capacity is generally used.