Switching power supply and linear power supply advantages and disadvantages and what are the similarities and differences?

Linear power supply (Linear power supply) is the first alternating current through the transformer to reduce the voltage amplitude, and then rectified by the rectifier circuit rectifier, to get a pulse of DC, and then filtered to get a DC voltage with a small ripple voltage. To achieve high precision DC voltage, it must be stabilized by a voltage regulator circuit. Advantages of linear power supply: stable performance, no interference such as high frequency ripple. Disadvantages of linear power supply: heat generation, low energy utilization. There is no ultra-high-power power supply for choice Switching power supply is the use of modern power electronics technology, control the ratio of switching time of the switching tube on and off, to maintain a stable output voltage of a power supply, switching power supply is generally composed of pulse width modulation (PWM) control IC and MOSFETs. Main features 1, small size, light weight: because there is no frequency transformer, so the volume and weight of only 20-30% of the linear power supply. 2, small power consumption, high efficiency: power transistors work in the switching state, so the power consumption on the transistor is small, the conversion efficiency is high, generally 60-70%, and linear power supply is only 30-40%. Switching power supply operating conditions:

1, switching: power electronics working in the switching state rather than linear state 2, high frequency: power electronics working at high frequency rather than close to the low frequency of the frequency 3, DC: switching power supply output is DC rather than AC linear power supply voltage feedback circuit is working in the linear (amplification) state, switching power supply is used for the voltage regulation of the tube works in the saturation and cut-off region, that is, the switching state.