Feb. 22, 2024
Safety capacitors are a type of capacitor used in electronic devices to ensure that their failure does not result in electric shock or endanger human safety. Here are several applications of safety capacitors:
Electromagnetic Interference Suppression: Safety capacitors are commonly used to suppress electromagnetic interference, especially in circuits involving high frequency, direct current, alternating current, and coupling. They are typically connected between the neutral and live wires, capable of withstanding voltage surges, and often used in parallel with resistors to discharge charges.
Capacitive Voltage Dropping: Safety capacitors are also utilized in capacitive voltage dropping circuits, which are simple and cost-effective. These circuits are commonly employed in controlling small household appliances, smart meters, and LED modules. Capacitive voltage dropping circuits utilize the capacitive reactance generated by capacitors at a certain frequency to limit the maximum operating current.
EMI Filtering: Safety capacitors (whether X capacitors or Y capacitors) are used for EMI filtering to eliminate high-frequency pulses from external power grids that interfere with the power supply and reduce electromagnetic interference from switch-mode power supplies themselves. EMI filters typically consist of two sets of capacitors: one set is X capacitors connected across the power lines for common mode suppression, and the other set is Y capacitors connected between the power line and ground for differential mode suppression.
Furthermore, safety capacitors are widely applied in household appliances, power products, LED lighting, chargers, uninterruptible power supplies, and more. When selecting safety capacitors, it is necessary to consider parameters such as rated capacitance, operating voltage range, temperature coefficient, and choose accordingly based on the specific requirements of the product.
This article was provided by JYH HSU (JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.), an electronic components manufacturer who produces all kinds of capacitors and resistors. JEC factories hold ISO 9000 and ISO 14000 certifications.
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