Shenmao Capacitors specialized in aluminum electrolytic capacitors from 1970

Power supply module how peripheral capacitance selection, from the rated pressure value of the capacitance to choose!

by:Shenmao     2020-11-26

how peripheral capacitance selection, power supply module from pressure rating of the capacitance value to choose! To introduce the following selection of specific methods. 1, in DC - DC power supply applications, the external input capacitance pressure value, we usually choose 1. 3 - 1. Four times the pressure. For example, the input voltage of 48 v that we chose to use filter capacitance pressure value is 63 v. DC - is the reason DC power supply starting current is big, easy to cause the secondary impulse voltage is too high, so as to damage the device. 2、AC- DC rectifier filter capacitance pressure value selection: in AC - DC rectifier filter circuit, according to the formula we can calculate the size of the DC voltage after rectification theory. For example: in the input - 90 265 vac rectifier circuit, from the formula, it can be concluded that voltage range in 127 - after rectification 375 vdc。 According to the experience we usually choose pressure value in 1. 1 - 1. Three times the theoretical calculation of voltage value of capacitor, consider the cost factor some 1 will also taken into account by its designer. 0 times the theoretical calculation of voltage value of capacitance.
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