Adjustable power supply to buy linear or switching type, mainly depends on what is used. Linear power supplies and switching power supplies have their own advantages and disadvantages, and need to be selected according to the actual use of the occasion.
The working principle of linear power supply and switching power supply
Linear power supply and switching power supply, from the name of the working principle can be analyzed, linear power supply is the use of linear regulation, the use of series regulator circuit; and switching type is used to switch power supply, voltage regulation is generally achieved by adjusting the PWM.
Linear adjustable power supply is used to step down the internal frequency transformer, the regulating part of the circuit is actually a series regulator circuit, the use of transistors as a switching element, the switch is connected in series with the load, through the adjustment of the switch on degree or equivalent resistance to achieve voltage regulation.
The internal step-down part of the switching adjustable power supply uses a switching power supply, and the output voltage regulation is achieved by controlling the duty cycle of the output switching tubes.
The difference between linear adjustable power supply and switching adjustable power supply
From the internal structure of the power supply has been working principle can be seen, although these two power supplies are identical in function, but there are still some differences in the use of the first to compare the advantages and disadvantages of these two power supplies.
Linear adjustable power supply due to the use of frequency transformers, so the larger power supply is not advantageous in terms of volume and weight, and high-power adjustable power supply transformer costs will be higher, which results in the overall cost of linear power supply to be higher than the switching power supply;.
The second main difference is the output ripple, because the switching power supply works in the high-frequency switching state, so the output of the switching power supply will have high-frequency interference.
On the choice of two power supplies, if the daily maintenance use can choose the switching power supply, because it is lighter, high-power volume can also be very small, and lower cost; but if you use the power supply debugging some of the output ripple requirements of the circuit, it is not recommended to use the switching power supply, the power supply output of high-frequency signal may cause interference to some circuits. For which brand of power supply quality, here is not a recommendation, you can search online, more information about the use of evaluation to make a choice.
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