How to Select capacitance for switching power supply?

by:MOSO     2020-02-26
Capacitor can be used to reduce ripple and absorb noise generated by switching regulator. It can also be used for rear-stage voltage stabilization to improve the stability and transient response capability of equipment. There should be no ripple noise or residual jitter in the power supply output. These circuits often use tantalum capacitors to reduce ripple, but tantalum capacitors may be affected by the noise of the switching regulator to produce unsafe transients. Switching power supply is used to control these power supplies. Due to its remarkable advantages, switching power supply has become the standard power supply for most electronic products. Capacitor can be used to reduce ripple and absorb noise generated by switching regulator. It can also be used for rear-stage voltage stabilization to improve the stability and transient response capability of equipment. There should be no ripple noise or residual jitter in the power supply output. These circuits often use tantalum capacitors to reduce ripple, but tantalum capacitors may be affected by the noise of the switching regulator to produce unsafe transients. In order to ensure reliable operation, the rated voltage of tantalum capacitor must be reduced. For example, for a tantalum capacitor with a rating of 10 uF/35 V, the operating voltage should be reduced to 17 V. If the ripple is filtered at the power input, rated 35V tantalum capacitors can work reliably on voltage rails up to 17 V. It is generally difficult for high-voltage power bus systems to achieve a 50% reduction in rated voltage. This situation limits the use of tantalum capacitors in applications where voltage rails are greater than 28 V. At present, since tantalum capacitors need to be derated, the only feasible way to apply high-voltage filtering is to use electrolytic capacitors with large volume and leads instead of tantalum capacitors. New tantalum capacitors in order to solve the problem of reducing the rated voltage, the research and development department has developed a new series of solid tantalum capacitors with higher rated voltage levels, with rated voltage as high as 75 WVDC. The application of 50V rated voltage capacitor in 28V and higher voltage guide rails has caused designers to worry, and new 63V and 75V tantalum capacitors are adopted, it can reach the industry-recognized safety index of 50% reduction in rated voltage. The dielectric is thinner and more consistent, so that the rated voltage of the solid tantalum capacitor can reach 75 V, thus achieving a technical breakthrough in improving the rated voltage. In the forming process, multiple processes are improved: the mechanical stress concentration generated in the forming process is reduced, and the local overheating of electrolyte in the capacitor forming process is reduced, the consistency of electrolyte concentration and purity in dielectric forming process is improved. Wireless inductively coupled charging a large number of inductive chargers use a return converter. Inductive charging provides charging power for medical equipment batteries. At the same time, inductive chargers are also used for a large number of portable devices (Such as toothbrush)China. In some high voltage induction charger applications, it is necessary to use a high voltage stable capacitor as a resonant capacitor. Since the primary coil of the induction charger needs to be driven by AC voltage, the capacitance must be adjusted accordingly. Induction chargers require high breakdown voltage (VBD) Performance, at the same time, some applications also need to protect high voltage arc discharge. In order to avoid arc discharge, the circuit board is generally coated with a protective coating, or the effect of isolating the high-voltage side from other parts of the circuit board is achieved by reasonably arranging the layout of components, etc. However, this method often requires a lot of circuit board space, because high-voltage circuits usually use larger lead-type through-hole plug-in capacitors. Dear Customer: Hello, our company is a high-quality development group with strong technical force, providing high-quality products, complete solutions and superior technical service companies for the majority of users. The main products are LED driver, COSEL, etc. The enterprise adheres to the tenet of establishing a career with integrity, keeping its career with quality and forging ahead, continuously climbing new peaks with a firmer pace, and making contributions to the national automation industry, welcome new and old customers to rest assured to buy their favorite products. We will serve you wholeheartedly!
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