The safety capacitor is divided into x type and y type

The safety capacitor is divided into x type and y type. AC power input is divided into 3 terminals: Fire L/Zero N/Ground, (L=Line, N=Neutral, G=Ground). Between “L-N”, i.e. “Fire-Zero”, is the X capacitor; between “L-G/N-G”, i.e. “Fire-Ground” or “Zero-Ground”, is the X capacitor. or zero-ground” is between the Y capacitor. Between the fire wire and the zero line connected to a capacitor like “X”, and between the fire wire and the ground wire connected to a capacitor like a “Y”, these are not according to what material to be divided.

X capacitor: Because the location of this capacitor is also critical, it also needs to comply with the relevant safety standards. x capacitor is also one of the safety capacitors. According to the actual needs, the capacitance of the X capacitor is allowed to be larger than the capacitance of the Y capacitor, but at this time must be connected in parallel with a safety resistor at both ends of the X capacitor, used to prevent the power cord unplugged, due to the charging and discharging process of the capacitor to the power cord plug charged for a long time. Safety standards, when the machine is working in the power cord is unplugged, in two seconds, the power cord plug voltage charged at both ends (or potential to ground) must be less than 30% of the original rated working voltage.

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As one of the safety capacitors, X capacitor is also required to obtain the certification from the safety testing agency. X capacitor is generally marked with safety certification mark and withstand voltage AC250V or AC275V, but its real DC withstand voltage is up to 2000V or more, so don’t use ordinary capacitors with nominal withstand voltage AC250V or DC400V as a substitute.

Usually, the X capacitor uses the mylar film type capacitor with high ripple current. This type of capacitor is larger in size, but its instantaneous charging and discharging current is also large, and its internal resistance is smaller.

Y capacitors: The two Y capacitors are connected in critical positions and must comply with the relevant safety standards to prevent leakage from electronic devices or electrically charged cases, which can easily endanger personal safety and lives. They are safety capacitors, which require the capacitance value not to be large, and the withstand voltage must be high. Therefore, the total capacity of Y capacitor should not exceed 4700PF (472). Ceramic Capacitor

GJB151 stipulates that the capacity of Y capacitor should be no more than 0.1uF. In addition to conforming to the corresponding grid voltage withstand voltage, Y capacitors are required to have sufficient safety margin in electrical and mechanical performance to avoid The voltage withstand performance of Y capacitor is important to protect personal safety.　Film Capacitor

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