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