What are the materials of safety capacitor? What role does it play in the circuit?

Material of safety capacitor

1. X safety capacitor

X1 and X2 capacitors are the most commonly used types of X safety capacitance. Although there are two types, their materials are identical. The dielectric of X capacitance is polypropylene film, and the electrode uses metal vapor coating (zinc aluminum synthesis thickened type); The shell uses flame-retardant PBT plastic (UL94V-0); Encapsulated flame retardant epoxy resin (UL94V-0), conductor: tinned copper clad wire.

The characteristics of X capacitor are: it can withstand overvoltage impact, excellent flame retardance, and is applicable to consumer electronics, LED drives, small household appliances, high frequency, DC, AC, coupling, step-down jumper pulse circuits.

2. Y safety capacitance

Y1 and Y2 capacitors are commonly used as Y-safe capacitors. They use ceramics as the medium, and silver layers are coated on both sides of the ceramic substrate, and then sintered into silver film as the electrode plate. The safety specification ceramic dielectric capacitor has high dielectric coefficient ceramic dielectric and flame-retardant epoxy resin packaging, which is applicable to the noise suppression circuit of the power circuit of electronic equipment, and can also be used as the antenna coupling jumper and bypass circuit.

Package: flame-retardant epoxy resin (UL94V-0); Pin: CP wire, tinned copper clad steel wire; Medium: Y5V; Y5U； Y5P。

Role of safety capacitance in circuit

1. Can be used in resistance-capacitance step-down circuit

The X safety regulation capacitor in the safety regulation capacitor can be used as the resistance and capacitance step-down capacitor. The resistance and capacitance step-down circuit is very low in cost, simple in circuit, and is used more in small power circuit.

Although CBB22 capacitor, MPB boxed capacitor and X2 safety gauge capacitor can be used in resistance-capacitance step-down circuit, X2 safety gauge capacitor has the best stability compared with the three.

2. For EMI filtering

Both X - and Y-safety capacitance can be used for EMI filtering.

The safety capacitor is usually only used for filtering in anti-interference circuits. They are used in power filter to filter common mode and differential mode interference.

The x capacitor is used in power filter to filter power supply and differential mode interference.

Our household electricity generally has three lines, namely zero line N, L and G. The Y capacitor is used between the zero line and the ground line, and between the live line and the ground line. Its function is common mode filtering.

Safety capacitors are mostly used in GaN chargers, LED lighting, small household appliances, electromechanical motors, power supply products, UPS and other circuits.