Y capacitor is one kind of safety capacitor, as a safety capacitor of y capacitor, it is required to obtain the certification of the safety testing organization. y capacitor is mostly blue in appearance, and generally marked with safety certification mark (such as UL, CSA, etc. logo) and withstand voltage AC300V or AC400V words. However, its real DC withstand voltage up to 4000V or more. It must be emphasized that y capacitors should not be used arbitrarily in place of ordinary ceramic capacitors.
Y capacitors in the switching power supply, Y capacitors for **** mode filtering, connected to the L in the ground or N in the ground, filtering L to ground or N to ground **** mode signal, Y capacitors are usually symmetrical use, the role of the main bypass, decoupling, filtering, energy storage.
Expanded Information:
Precautions:
1, the input voltage of the switching power supply can be 220V or 110V, according to the circuit design to reasonably select the input voltage gear. Otherwise it will cause damage to the switching power supply.
2, pay attention to distinguish between the ground and zero terminals of the output voltage terminal of the switching power supply. And ensure that the switching power supply grounding is reliable.
3, the switching power supply metal casing power supply casing is generally connected to the ground (FG), to be reliably grounded to ensure safety, not mistakenly connect the casing to the zero line.
4, in the installation of the switching power supply is completed before the power trial, please check and proofread the connection on the terminals, sure that the input and output, AC and DC, single-phase and multi-phase, positive and negative poles, the voltage value and the value of the current and so on correctly undoubtedly, before you can power on the operation.
Baidu Encyclopedia - Switching Power Supply
Baidu Encyclopedia - Y Capacitor