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The working principle of safety capacitance

by:SMiLer     2021-02-26
Safety capacitance is refers to the capacitor failure after, will not lead to electric shock, don't endanger personal safety capacitor. Safety capacitors are usually only used in the filter function of anti-interference circuit. They are used in power supply filter, power filtering effect, respectively for common mode, differential mode interference filter. For safety and EMC consideration, general advice plus the entrance of the power supply safety capacitance. Safety capacitance discharge and capacitors, capacitors in the external power after disconnecting the charge will be kept for a long time, if touch will be electric, and safety capacitance is not the problem. In the ac power input, generally need to increase the three security capacitance to suppress the EMI conducted interference. Safety working principle of capacitance safety capacitance means used in such situations, namely capacitor expires, will not lead to electric shock, do not endanger personal safety. It includes capacitance X Y capacitance of two types, capacitance is two line jumper in the power line (X L - N) The capacitance between, generally choose metal film capacitors; Y capacitor are respectively jumper in the power line between line and ground ( L - E, N - E) Capacitance, usually come in pairs. Based on the limitation of leakage current, capacitance value Y cannot too big, general level X capacitor is uF, Y capacitor is nF level. Capacitance differential mode interference suppression X, Y capacitor common-mode interference suppression. Safety capacitance principle: when the pressure directly effect on the surface of the diaphragm, make diaphragm produces tiny deformation, high precision circuit of measuring diaphragm will this tiny deformation transformation become is proportional to the pressure of the highly linear, and boosting voltage is proportional to the voltage signal. Safety capacitance discharge and capacitors, capacitors in the external power after disconnecting the charge will be kept for a long time, if touch will be electric, and safety capacitance is not the problem. For safety and EMC consideration, general advice plus the entrance of the power supply safety capacitance. In the ac power input, generally need to increase the three security capacitance to suppress the EMI conducted interference. They are used in power supply filter, power filtering effect, respectively for common mode, differential mode interference filter. Safety capacitance safety level applications allow peak pulse voltage over-voltage level ( IEC664) X1 》2. 5 kv≤ 4. 0kV Ⅲ  X2 ≤ 2. 5 kvⅡX3勒; 1. Security level 2 kv safety capacitance type insulation rated voltage range Y1 double insulation or reinforced insulation & ge; 250 vy2 basic insulation or additional insulation & ge; 150 v≤ 250 vy3 basic insulation or additional insulation & ge; 150 v≤ 250 basic insulation or additional insulation vy4 vy 150 capacitance of electric capacity must be restricted, so as to achieve control in the role of the rated frequency and rated voltage, the size of the flow through the leakage current and the purpose of the impact on the system EMC performance. G * * * 151 Y capacitor capacity should not be greater than zero. 1uF。 Y capacitance in addition to conform to the corresponding grid voltage withstand voltage, also claim the capacitor in the electrical and mechanical properties have enough safety margin, avoid short-circuit phenomenon under extreme environmental conditions appear breakdown, Y capacitance pressure performance is of great significance for protecting the personal safety.
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