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cable news: the difference between switching power supply and linear power supply
from：guichao author：admin click： 389 addtime：2017-04-17 16:51:50
in the state of linear power amplification | regulator adjustment tube,
thus the heat, low efficiency (about 35%),
need to increase the size of the heat sink,
but also the same is also a large volume of power frequency transformer,
the transformer will be larger when multiple sets of voltage output are to be made.
the switching power supply regulator operates in saturation and as of state,
thus small calorific value,
high efficiency (more than 75%) and eliminates the large volume of transformers.
but the dc output of the switching power supply
will stack larger ripple (50mvat5voutputtypical),
at the output end of the voltage regulator diode can be improved,
in addition, due to the work of the switch will produce a lot of peak pulse interference,
it is also necessary to improve the magnetic beads in the circuit.
in contrast, the linear power supply has no defects,
its ripple can be done very little (below 5mv).
for power efficiency and installation volume requirements of the local switching power supply is preferred,
for electromagnetic interference and power supply requirements
(for example, capacitance leakage detection) more linear power supply.
in addition, when the circuit needs to be isolated
now most used to do part of the power supply of the dc dc isolation
(dc-dc from its working principle is the switching power supply).
also，
high frequency transformer used in switching power supply may be troublesome.