First of all, the switching power supply is a power supply, and the switching device is used. Of course, the function of the switching device is roughly the same as that of the general switch. The switching power supply can be divided into an AC input switching power supply and a DC input switching power supply. We usually refer to the switching power supply of the AC input, which turns the AC into DC.
The technical parameters of the capacitor in the switching power supply mainly include capacitance, withstand voltage, loss angle, and stability.
The X capacitor is a type of safety capacitor. According to IEC 60384-14, the capacitor is divided into an X capacitor and a Y capacitor. The X line capacitor is between the hot line and the neutral line. The X capacitor is used in the power supply filter to filter the power supply and filter the differential mode interference.
The Y capacitor is used to eliminate common mode interference. Capacitors that are also connected between the two lines of the power line and the ground (LE, NE), are usually in pairs. The Y capacitor value cannot be too large based on the leakage current limit.
The X capacitor Y capacitor is a safety capacitor. The difference is that the X capacitor is connected to both ends of the input line to eliminate differential mode interference. The Y capacitor is connected between the input line and the ground line to eliminate common mode interference.
X Capacitor---Metal Film Capacitor; Generally, X-capacitor is a polyester film capacitor with a large ripple current resistance. This type of capacitor is bulky, but it allows a large amount of current to be instantaneously charged and discharged, and its internal resistance is correspondingly small. The X capacitor uses a plastic square high-voltage cbb capacitor. The cbb capacitor not only has better electrical performance, but also can reduce the influence of high-frequency pulses on the power supply in parallel with the input end of the power supply.
Y capacitors --- often used high pressure ceramic tiles. The Y-type capacitor is connected between the phase line and the ground. These capacitors have a value of approximately a few nF in order not to exceed the ground allowable leakage values ​​defined by the relevant safety standards. In general, the Y capacitor should be connected to a conductor with high noise interference. Y1 is a double-insulated Y capacitor for bridging a secondary side. Y2 belongs to the basic single-insulation Y capacitor, which is used to bridge the primary side to ground protection, that is, the FG line.
X capacitors; Y capacitors have different functions in switching power supplies and cannot be replaced with each other.
Safety capacitor, X capacitor, Y capacitor
The technical parameters of the capacitor in the switching power supply mainly include capacitance; withstand voltage; loss angle; stability, etc.; X capacitor; Y capacitor application in switching power supply have different functions; they are not interchangeable.
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