How Linear Power Supply Works
Linear power supply mainly includes power frequency transformer, output rectifier filter, control circuit, protection circuit, etc.
The linear power supply first transforms the AC power through a transformer, and then rectifies and filters the rectifier circuit to obtain an unstable DC voltage. To achieve a high-precision DC voltage, the output voltage must be adjusted through voltage feedback. This power supply technology is very mature and can achieve very high accuracy. High stability, small ripple, and no interference and noise that switching power supplies have. But its disadvantage is that it requires a huge and bulky transformer, the volume and weight of the required filter capacitor are also quite large, and the voltage feedback circuit works in a linear state, there is a certain voltage drop on the regulating tube, and a large working current is output. When the power consumption of the adjustment tube is too large, the conversion efficiency is low, and a large heat sink must be installed. This kind of power supply is not suitable for the needs of equipment such as computers, and will be gradually replaced by switching power supplies.
