Introduction of X2 Capacitor

Capacitors are divided into X capacitors and Y capacitors, and the X capacitor is between the live wire and the neutral wire. The x capacitor is used in power supply filtering, which acts as a power filter and filters differential mode interference. The capacitor connected in parallel between the live line and the neutral line suppression is generally called an X capacitor. Since the location of this capacitor connection is also critical, it also needs to meet safety standards. Therefore, the X capacitor is also one of the safety capacitors.

The capacitance of the X capacitor is allowed to be larger than that of the Y capacitor, but a safety resistor must be connected in parallel at both ends of the X capacitor to prevent the power cord plug from being charged for a long time due to the charging and discharging process of the capacitor when the power cord is unplugged. The safety standard stipulates that when the power cord of the machine at work is unplugged, within two seconds, the charged voltage (or ground potential) at both ends of the power cord plug must be less than 30% of the original rated working voltage.

Different capacitors are used in different places. Generally, X2 safety capacitors are often used in power circuits, but many people don’t know much about X2 safety capacitors. What kind of capacitors are they and what are their characteristics? What about the role? Today we will introduce X2 safety capacitors in detail.

X2 is a low-voltage safety capacitor, and X refers to X type: the capacitance between the phase line and the neutral line. Another Y capacitor is between the phase line and the ground line. In X2 of safety capacitors, 2 means that the safety level (overvoltage level) of the capacitor is level two: the peak pulse voltage allowed in the application is not greater than 2.5kV.

Product features of X2 capacitors:

High temperature resistance vinyl shell, epoxy encapsulation, its flame retardant properties meet the UL-120 standard.

Small size, low high-frequency loss, can withstand AC peak surge impact, strong over-current capability, small capacity and loss attenuation, and long service life.

It has high resistance to external electrical interference, high reliability, good self-healing characteristics, and good safety protection.

Non-polar, high insulation resistance, excellent frequency characteristics (broad frequency response), and low dielectric loss.

High temperature load: 105℃, 1000 hours, cold resistance -40℃, 1000 hours

Damp heat: 40°C, 90%~95%RH, 5000 hours.

Excellent frequency characteristics, low high frequency loss.

The function of X2 capacitor:

Suitable for large current occasions; widely used in bypass, DC blocking, filtering, coupling, resonance, RC step-down and other circuits of various electronic and electrical products. Widely used in LED drive capacitors, small home appliance control boards, new energy chargers, switched capacitors, frequency converters, electric welding machines, and industrial power supplies.

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