Difference between switch mode power supply and analogue power supply
The difference between switching power supply and analogue power supply
Analogue power supply: that is, transformer power supply, through the core, coil, the number of turns of the coil determines the ratio of the voltage at both ends, the role of the core is to transfer the changing magnetic field, (our) main coil at a frequency of 50HZ to produce a changing magnetic field, this changing magnetic field through the core to the sub-coil, in the secondary coil, the induced voltage is generated, and so the transformer achieves the transformation of the voltage.
Disadvantages of analogue power supply: the coil, the iron core itself is a conductor, then they will be in the process of transforming the voltage due to self-induced current and heat (loss), so the efficiency of the transformer is very low, generally not more than 35%.
The difference between switching power supply and analogue power supply
Audio equipment amplifier in the application of the transformer: high-power amplifier needs transformer to provide more power output, then, only through the increase in the number of turns of the coil, core volume to achieve, the increase in the number of turns and core volume will increase its loss, so the transformer of the high-power amplifier must be made very large, which will lead to: bulky, heat generation.
Switching power supply: before the current into the transformer, through the switching function of the transistor, we usually 50HZ current frequency to tens of thousands of HZ, at such a high frequency, the magnetic field changes the frequency also reaches several tens of thousands of HZ, then, you can reduce the number of turns of the coil, the core volume to obtain the same voltage conversion ratio, due to the number of turns of the coil, the core volume is reduced, the loss is greatly reduced, the general efficiency of switching power supplies Reach 90%, and the volume can be made very small, and the output is stable, so the switching power supply has analogue power supply is difficult to achieve the advantages.
