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The application of X safety capacitor

by:SMiLer     2021-03-09
X application safety capacitance (1) inhibition of electromagnetic interference resistance to electromagnetic interference is the most common X capacitance effect, generally two pins jumper between zero line and the line of fire, suitable for high frequency, dc, ac, coupling, jumper pulse circuit, able to withstand overvoltage, generally used with resistor in parallel, the purpose is to discharge charge effect; (1) resistance capacity step-down resistance capacity buck is X capacitor is often used, especially for low cost products, the working principle of capacitance step-down is using capacitors in a ac signal frequency of capacitive reactance to limit the maximum working current. On the capacitor in series at the same time a resistance element, the impedance components at both ends of the voltage and the power produced by it all depends on the characteristics of the impedance components. Therefore, capacitance step-down is actually using capacitive reactance current-limiting, actually have a limited current and capacitor and dynamically allocated capacitors and load voltage on both ends. The following figure (3) filter can be used as dc filter is used, the X2 safety capacitor can be used in parallel. Y safety capacitor used a lot of isolating switch power supply in the primary and secondary plus Y capacitor is to provide secondary common-mode current with a loop to primary, reduce the influence of common-mode current to the output. Y capacitor concatenated between to high pressure and low pressure, sometimes using two Y capacitor in series is in order to improve the high pressure and low pressure between the pressure between, sometimes there will be a shortage of pressure, won't cause safety capacitance type pressure, can choose high voltage ceramic capacitors as Y capacitance, Y capacitor connection usually have four kind of situations: (1) input, and common-mode inductor filter, L and N for PE and respectively; (2) energy storage large capacitor positive and negative side to add PE; (3) output for PE add; (4) and the former vice edge transformer jumper.
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