Switching power supply output 12V 10A how to use the transformer how much ah
Under normal circumstances the switching power supply itself is equivalent to the transformer, and no need to then transform the transformer. Switching power input 220v AC, output 12V. 10A is the switching power supply can output the maximum current, the use of generally less than 10A (this current is too large, I usually use 1A). Power P = 12 * I
Switching power supply does not need the front side of the transformer ah, in our country, 100V - 260V, 50 / 60HZ under normal use. Do not repeat the mistake again. {Single-phase electric power = voltage × current × power factor that is P = U × I × cos ?}, and the voltage multiplied by the current that is the power factor cos ? = .1 case, only for pure resistance circuit. The switching power supply circuit is an inductive load, and the inductive and capacitive loads have a power factor
If it is usually used in the forward and flyback. EC core
S = 0.15 root number Pm
S is the cross-sectional area of the EC core (square centimeters), and Pm is the maximum power of the EC core
Finally, calculate the width of the radius r = root cross-sectional area divided by 3.14
You calculated the calculation, the efficiency of 80%, the radius of 0.77 cm EC core.
This is a rough calculation, you can be practical.
Greater than 120W of the transformer can be, P equal to the UI is equal to 12 * 10 is equal to 120 (W).
Working conditions
1, switch: power electronic devices work in the switch state rather than linear state
2, high frequency: power electronic devices work in high frequency rather than close to the frequency of low frequency
3, DC: switching power supply output is DC instead of communication
main feature
1, small size, light weight: no power frequency transformer, so the volume and weight of only 20 to 30% of linear power supply.
2, low power consumption, high efficiency: power transistor working in the switch state, so the transistor power consumption is small, high conversion efficiency, generally 60 ~ 70%, while the linear power supply is only 30 to 40%.
