X1Y2 safety capacitors:
Insulation class: Basic insulation
Dielectric strength: 2500V
characteristic:
Ceramic dielectric with high dielectric constant
Flame retardant epoxy package
Passed CQC, VDE, ENEC, CK, UL safety certification standards
application:
① Suitable for noise suppression circuit of power circuit of electronic equipment
② Can be used in antenna coupling crossover and bypass circuits, in various small appliance control boards
③ Power filter, high frequency AC load, switching power supply, electronic ballast, LED energy saving lamp
X and Y capacitors are safety capacitors. The difference is that X capacitors are connected at both ends of the input line to eliminate differential mode interference, and Y capacitors are connected between the input and ground lines to eliminate common mode interference;
X capacitors use plastic-sealed high-voltage CBB capacitors. CBB capacitors not only have better electrical performance, but also are connected in parallel with the input of the power supply to effectively reduce the impact of high-frequency pulses on the switching power supply.
Y capacitors --- there are high-voltage porcelain. The Y-type capacitor is connected between the phase line and the ground line. In order to not exceed the allowable leakage value of the ground wire defined by the relevant safety standards, the value of these capacitors is about a few nF. Generally, the Y capacitor should be connected to the wire with large noise interference;
The Y capacitor is divided into a Y1 capacitor and a Y2 capacitor. Y1 is a double-insulated Y capacitor and is used to bridge the primary and secondary sides. Y2 is a basic single-insulated Y capacitor and is used to bridge the primary side to protect the ground, that is, the FG line.
Safety capacitors are used in situations where the capacitor will not cause an electric shock after it fails, and will not endanger personal safety.
X Safety Capacitor Safety Level Allowable peak pulse voltage in application Overvoltage level (IEC664)
X1> 2.5kV ≤4.0kV SW {{
X2 ≤2.5kV IY-F 6bXV
X3 ≤1.2kV} _. T.S @; 9e
Y safety capacitor safety level insulation type rated voltage range
Y1 double insulation or reinforced insulation ≥ 250V
Y2 basic insulation or additional insulation ≥150V ≤250V
Y3 basic insulation or additional insulation ≥150V ≤250V
Y4 basic or supplementary insulation <150V
X capacitor suppresses differential mode interference
Y capacitor suppresses common mode interference
According to IEC 60384-14, capacitors are divided into X capacitors and Y capacitors.
1. X capacitance is the capacitor across L-N.
2. Y capacitor is the capacitor across L-G / N-G. (L = Line, N = Neutral, G = Ground).
(1.) The most important purpose of adding Y-CAP is to overcome EMI
(2.) Now most people don't want to add Y-CAP, there are two points:
a. In order to reduce costs, a Y-CAP has 0.3RMB. Now everyone is working on NO Y design.
b. Our switching power supply has a lot of troubles when used on some audio equipment. For example, the switching power supply for mp3 is not as good as the linear power supply. For fixed telephones, the switching power supply for ADSL will have noise;
3. The safety regulations did not say that the Y-CAP must be added, as long as your EMI can pass, too much Y-CAP will affect the leakage current.
X capacitors are divided into X1, X2, X3. The main differences are: 1. X1 withstands high voltages greater than 2.5 kV, 4 kV or less, 2. X2 withstands high voltages less than or equal to 2.5 kV, 3. X3 withstands high voltages less than or equal to 1.2 kV For Y1, Y2, Y3, Y4, the main differences are: 1. Y1 withstands high voltages greater than 8 kV, 2. Y2 withstands high voltages greater than 5 kV, 3. Y3 withstands high voltages n / a 4. Y4 withstands high voltages greater than 2.5 kV. Then "X1 400V, Y1 250V" means that the parameters when used as X capacitors are: withstand voltage greater than 2.5KV, the maximum operating voltage should not exceed 400V; the parameters when used as Y capacitors are: withstand voltage greater than 8KV, the maximum operating voltage should not exceed 250V. So you can choose the right capacitor yourself.
The safety capacitor 250V can replace the high-voltage ceramic capacitor 3KV. However, high-voltage ceramic capacitors cannot replace safety capacitors because there is no safety certification.
