How to distinguish between a switching power supply and a linear power supply The voltage feedback circuit of a switching power supply and a linear power supply is in a linear (amplified) state, and a switching power supply means that the tube used for voltage adjustment works in the saturation and cut-off regions, namely switch status. The linear power supply generally samples the output voltage and then sends it to the comparison voltage amplifier with the reference voltage. The output of the voltage amplifier is used as the input of the voltage regulating tube to control the regulating tube so that the junction voltage changes with the change of the input, so as to adjust its output. voltage, but the switching power supply changes the output voltage by changing the on and off time of the regulating tube, that is, changing the duty cycle! From its main characteristics: the linear power supply technology is very mature, the production cost is low, it can achieve high stability, the ripple is small, and its own interference and noise are relatively small, but because it works at the power frequency (50Hz), the transformer The volume is relatively large, and the efficiency is low (generally the efficiency of full-load operation is only about 80%). The overall volume is relatively large and it is bulky. And the input voltage range is required to be high; while the switching power supply is in a high-frequency state of work, the volume of the transformer is relatively small. , is relatively lightweight, but the output ripple is larger than that of linear power supplies, but due to its simple structure, low cost and high efficiency (the efficiency of switching power supplies on the market can also reach more than 90%), it has replaced linear power supplies in many occasions. The trend of future power development. A simple comparison of linear power supply, thyristor power supply, and switching power supply circuit Regarding the circuit structure, whether it is a linear power supply, a thyristor power supply or a switching power supply depends on the specific occasion and is used reasonably.
These three circuits are widely used both at home and abroad, and each has its own characteristics. The thyristor power supply, with its powerful output power, makes the linear power supply and switching power supply irreplaceable. Linear power supplies are widely used for their high precision and superior performance.
Switching power supplies have been widely used in many occasions where the output voltage and output current are relatively stable because the bulky power frequency transformer is omitted, and the volume and weight are reduced to varying degrees. How to distinguish between linear power supply and switching power supply switching power supply and linear power supply Shenzhen Noyafa Electronic Technology Co., Ltd.
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