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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