Linear power supply voltage feedback circuit is working in a linear (amplified) state, switching power supply is used for voltage adjustment of the tube work in the saturation and cut-off area, that is, switch state.

The linear power supply typically samples the output voltage and then feeds it into the reference voltage amplifier. The output of the voltage amplifier is used as an input to the voltage regulator to control the adjustment tube to change its junction voltage as the input changes to adjust its output Voltage, but the switching power supply is to change the output voltage by changing the duty cycle of the adjustment tube to change the duty cycle.

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Linear power technology is very mature, high working temperature, high reliability, can achieve a high degree of stability, ripple smaller, their interference and noise are relatively small, but because the work in the frequency (50Hz), the transformer volume is relatively large , Low efficiency (generally full of work efficiency is only about 80%) input voltage range requirements are high. But because of its high working temperature, ripple small advantages, become the most widely used logging tool power program.

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Switching power supply is the work of high-frequency state, the transformer is relatively small, relatively light, but the output ripple than the linear power supply is large, and from the current level of technology, the operating temperature is low. But the structure is simple, high efficiency, with the passage of time, the wider use of the future will be more and more widely.