Characteristics of traditional linear regulated power supply

The voltage feedback circuit of linear power supply works in linear state, and switching power supply means that the tube used for voltage regulation works in saturation cutoff region, that is, switching state.

Principle:

Linear power supply usually samples the output voltage and sends it to the comparison voltage amplifier together with the reference voltage. The output of this voltage amplifier is used as the input of the voltage regulator, which controls the regulator to make its junction voltage change with the input, thus adjusting its output voltage. The switching power supply changes the output voltage by changing the on-off time of the regulator, that is, the duty cycle!

Features:

From its main characteristics, linear power supply has mature technology, low manufacturing cost, high stability, small ripple and no interference and noise with switching power supply, but its volume is relatively large compared with switching power supply and its input voltage range is high; Switching power supply is the opposite.