Switching power supply efficiency
if the output current 2 / 10v, when the diode conduction voltage is 0.7v, the loss of 0.7 * 2 = 1.4W, transformer output (10 + 0.7) * 2 = 21.4 watts, available power of 20 watts, efficiency of about 90%;
?? Note: Only the output loss is calculated, excluding the transformer and other losses.
for example, the output current is 10A / 2V, when the diode conduction voltage is 0.7v, the loss is 0.7 * 10 = 7 watts, the transformer output (2 + 0.7) * 1 = 27 watts, the available power of 20 watts, the efficiency of about 73%;
The lower the output voltage of the switching power supply, the lower the efficiency is, because the output loss of the output rectifier is inversely proportional to the output voltage;
