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HOME >> What is the difference between switching power supply and normal power supply?
What is the difference between switching power supply and normal power supply?
Source: | Author:pmo89cafb | Published time: 2020-11-02 | 4159 Views | Share:

The output voltage can be controlled by controlling the closing and opening time of the switch (i.e. PWM pulse width modulation). If the time of opening and closing is controlled by detecting the output voltage to keep the output voltage unchanged, the purpose of voltage stabilization is realized.
Common power supply and switching power supply have voltage regulator, which uses feedback principle to stabilize voltage. The difference is that switching power supply uses switch tube to adjust, while common power supply uses linear amplification area of triode to adjust. In comparison, the switching power supply has low energy consumption, wide application range for AC voltage, better ripple coefficient of output DC, and the disadvantage is switching pulse interference.
The main working principle of the common half bridge switching power supply is that the switches of the upper bridge and the lower bridge (the switch tube is VMOS when the frequency is high) turn on in turn. First, the current flows through the upper bridge switch tube. Using the storage function of the inductance coil, the electric energy is gathered in the coil. Finally, the upper bridge switch tube is closed, and the lower bridge switch tube is opened. The inductance coil and capacitance continuously supply external power. Then turn off the lower bridge switch tube, and then turn on the upper bridge to let the current enter. This is repeated. Because the two switch tubes need to be switched on and off in turn, it is called switching power supply.