Connection of transformer power source with wide input range solves those cases when the power supply voltage ranges between two distant limit values, while the required output voltage remains constant. The basis of the solution is a transformer (7) with windings switched between by the switches (5, 6). These switches (5, 6) are controlled by a processor (4), which always after resetting when one limit voltage turns off and the other limit voltage turns on finds out from the output of the voltage converter (3), which voltage is connected to the input of the power supply source, and accordingly it switches on the relevant switch (5, 6), thus selecting the corresponding primary winding of the transformer (7). On the secondary winding of the transformer (7) therefore always appears the voltage of the same value, which may be further processed by traditional rectifier and stabilizer. In this way, the connection allows to transform the alternating voltage with wide range of input voltages where the primary voltage
