"First AC into DC, and then into a higher frequency of alternating current through the high-frequency transformer voltage conversion" Why? "LED display as a high-precision instrument to select the switching power supply instead of the transformer" Why?
Transformer can change the voltage, and switching power supply is not a
Electronic transformer "can be simply understood as" simple without switching power supply regulator "
Mainly used for some need high-power transformers, and the frequency, output voltage and other parameters are not strictly required, but the cost requirements are very sensitive occasions, such as lighting applications in the spotlight transformer. Spotlights are purely resistive loads that are insensitive to operating frequency but require very high power. Therefore, the use of traditional power frequency transformers is costly and wasteful of copper and iron, so the most suitable use of "electronic transformers" to solve this need.
"Switching power supply" PWM technology can control the output power to accurately adjust the output voltage, the input voltage changes can ensure that the output voltage unchanged, and "electronic transformer" does not have this function!
"Switching power supply" has a lot of advantages compared to traditional linear power supply. High cost (efficiency, efficiency, load regulation rate) Therefore, the application field is very extensive, such as computer TV mobile phone charger used in PC power are "switching power supply"
Electronic transformer and switching power supply working principle is almost;
Are through the electronic components will be converted into low voltage piezoelectric;
The difference is: electronic transformer is the high-voltage power frequency conversion into low-voltage high-frequency electricity, only need to transform the lighting applications;
The switching power supply can output a stable DC voltage according to the design.
Switching power supply and the difference between the transformer is a very stable switching power to a certain range of voltage into a very low voltage or high voltage (such as 110V-250 input, the output voltage can be stable control in the required voltage plus or minus 0.5 V)! Transformer output voltage is changing with the input voltage, that is, the input voltage increases the output voltage is also increased, the input voltage to reduce the output voltage is also reduced. Because the switching power supply is the first AC into DC, DC power through the power switch and then become a higher frequency of alternating current through the high-frequency transformer voltage conversion is not only efficient and high frequency after the greatly reduced the volume, but also save the copper and iron loss. Because the switch is controlled by the power switch, the switch is turned on for a short time and the output voltage can be maintained. When the load is large, the switch keeps working to keep the output voltage. So the switching power supply output voltage is stable, can be used as LED display and other high-precision instrument selection.
A: The switching power supply is small, light weight, high conversion efficiency.
