What is the function of X1 safety capacitors?

We know that there are two main types of X1 and X2 capacitors, X1 safety capacitors and X1 safety capacitors? In fact, from the perspective of work, the functions of X1 capacitor and X2 capacitor are exactly the same.

The differences are: the withstand voltage levels of X1 and X2 capacitors are different: X1 2 5KV 4 0KV; x2≤2．5kv

Characteristics and functions of X1 safety capacitors: Complete certification: The product has passed the certification of nine national standards and specifications, such as UL, CUL, VDE, SEV, VDE, KC, etc.

The characteristics of the X1 capacitor: (1) the X1 stage can withstand the surge radio wave voltage 4kV, which is higher than the X2 level 2 5kV and guaranteed, (2) the small size and good characteristics are smaller than the X2 class size.

3) The unit price is not more expensive than the x2 level, which is quite competitive.

4) In the line design, the X1 level can replace the X2 level, but the X2 level cannot be applied to the X1 line, because the X1 level surge voltage is higher.

These capacitors are used to suppress the surge and high current at the moment of switching in various circuits such as switching power supplies (e.g., stirrers, electric fans, coffee grinders, stereos, television circuits in typewriters, calculators, computer monitors, and household appliances).

Most of the safety capacitors are connected in parallel at the input end of the power supply, which plays a filtering role, which can effectively eliminate the interference of the power grid when the circuit is working, play the role of purifying the power supply, and can also eliminate the interference of the power grid and affect the normal operation of the circuit.

The x-capacitance refers to the capacitor that spans L-N, and the Y-capacitance refers to the capacitor that spans L-G N-G.

The x capacitor is divided into x1, x2, and x3, and the main differences are:

1.X1 high voltage resistance greater than kv, less than or equal to 4 kv, 2x2High voltage resistance less than or equal to kv, 3x3 High pressure resistance is less than or equal to kV

Y capacitors are divided into Y1, Y2, Y3, Y4, and the main differences are:

1.Y1 high pressure resistance is greater than 8 kV, 2Y2 high voltage resistance is greater than 5 kV, 3Y3 is resistant to high pressure N a

4.Y4 High pressure resistance is greater than kV

The difference between X2 safety capacitor and Y capacitor is that one has a large high voltage resistance and a small one, relatively speaking, the high voltage resistance of Y capacitor is much higher than that of X2. This is where the biggest difference between the two lies. The second is that the installation position is different, for the X capacitor between the neutral line of the live wire, and the Y capacitor between the live wire and the ground.

They are used in power supply filters to filter power supplies, and to filter common mode and differential mode disturbances respectively. A capacitor between the live wire and the 0 wire is x, and a capacitor between the live wire and the ground wire is like a y. Due to the direct capacitance of the live wire and the 0 wire, it is affected by the voltage peak to avoid short circuit, and the more important parameter is the withstand voltage level, and there is no fixed limit value in the capacitance value.

The direct capacitance of the live wire and ground wire involves the problem of leakage safety, so it pays attention to the parameter of insulation level, and too large capacitance capacitance will affect the human and the device after the power supply is cut off.

So much has been said by E-Rong.com. Do you know the difference between X2 safety capacitors and Y capacitors? It is precisely because of these differences that there is a classification of grades, and relatively speaking, the safety factor of Y capacitance is higher.

X and Y capacitors are both safety capacitors, the difference is that X capacitors are connected to both ends of the input line to eliminate differential mode interference, and Y capacitors are connected between the input line and the ground wire to eliminate common mode interference. The X capacitor adopts a plastic square high-voltage CBB capacitor, which not only has better electrical performance, but also can effectively reduce the impact of high-frequency pulses on the switching power supply when connected in parallel with the input of the power supply. Y capacitors are often made of high-voltage porcelain.

The Y-capacitor is connected between the phase and ground wires. In order not to exceed the permissible leakage value of the ground wire as defined by the relevant safety standards, the value of these capacitors is in the range of a few nF. In general, the Y capacitor should be connected to a wire with high noise interference.

Y1 is a double-insulated Y capacitor that is used to bridge the primary and secondary sides. Y2 is a basic single insulated Y capacitor, which is used to cross the primary side to protect the earth, that is, the FG line. X capacitors and Y capacitors are collectively referred to as safety capacitors, and safety capacitors refer to those used in such occasions, that is, after the capacitor fails, it will not cause electric shock and will not endanger personal safety.

X capacitors are often made of metal film; In general, X capacitors mostly use polyester film capacitors with large ripple resistance. This type of capacitor is larger, but it also allows for instantaneous charging and discharging, and its internal resistance is correspondingly small. The X capacitor adopts a plastic square high-voltage CBB capacitor, which not only has better electrical performance, but also can effectively reduce the influence of high-frequency pulses when connected in parallel with the input of the power supply.

X capacitor is generally a capacitor that is connected between L-N of AC grid power supply, and metal film capacitors are generally selected; Y capacitors are capacitors that are connected between the AC grid power supply and ground (L-E, N-E) respectively, and generally appear in pairs. Based on the limitation of leakage current, the value of Y capacitance should not be too large, generally the X capacitance is UF class, and the Y capacitance is NF class. The X capacitor mainly suppresses differential-mode interference, and the Y-capacitor mainly suppresses common-mode interference.

Hello, the use of safety capacitors X2 needs to pay attention to:

1. DC capacitors are not allowed to be used as cross-line capacitors: For X2 class power supply electromagnetic interference suppression capacitors, they should be suitable for occasions that will not cause electric shock hazards when the capacitor fails, such as the impulse voltage that the power supply can withstand when the power supply is connected across lines. For the Y2 power supply to suppress electromagnetic interference, the capacitor should be suitable for the occasion that the capacitor will not cause the danger of electric shock when the capacitor fails, and can withstand the impulse voltage impact of 5kV when the power supply is connected across the line, and the breakdown phenomenon will not occur.

2. Capacitors for suppressing electromagnetic interference in power supply When using capacitors in power supply cross-line circuits to eliminate noise, not only normal voltage, but also abnormal impulse voltage (such as lightning) must be considered, which may cause smoke or ** from the capacitor. Therefore, the standards for cross-wire capacitors are strictly regulated in different countries, so it is necessary to use safety capacitors that have been guaranteed and certified. Zhixu electronic safety capacitor products, accurate delivery, fast starting, the key is factory direct sales, cheap and beautiful.