cable news: the difference between switching power supply and linear power supply-非凡电子娱乐

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, the utility model has the advantages of small calorific value and high efficiency (more than 75%), and the large volume transformer is omitted.

but the dc output of the switching power supply will be superimposed on a 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 purity requirements (such as capacitance leakage detection) more linear power supply.

in addition when the need for isolation in the circuit to do the most now with the dc dc isolation power supply

(dc-dc from its working principle is the switching power supply).

in addition, the switching power supply used in high-frequency transformers may turn up trouble.