Why can a high frequency transformer change the voltage?
The transformer's ability to change the voltage is determined by its working principle. Two mutually insulated windings are wound around the closed iron core, of which the primary winding is connected to the power supply and the secondary winding is connected to the output power load. When the ac power to the primary winding, has the alternating current through the winding, produce alternating magnetic flux in the core, the alternating magnetic flux is not only through a winding, but also through the secondary winding. Induction electromotive force E1 and E2 are generated in the two windings respectively. At this time, if the secondary winding is connected with the external circuit load, there will be current flowing into the load, that is, the secondary winding has power output. E1 / E2 = N1, N2, I1 / I2 = N21 / N1, the ratio of the transformer primary and secondary winding induction electric potential is equal to one, the ratio of the secondary winding circle number, one, the ratio of the secondary winding current and the primary and secondary windings is inversely proportional to the number of turns, the transformer is according to the principle of electromagnetic induction through the primary and secondary winding circle number changed to the primary and secondary windings of high and low voltage.
Detailed steps for secondary voltage of transformer
Electric soldering iron, pliers, multimeter, iron plate [15CM*20CM], gas furnace or alcohol lamp]
1. V1/V2=N1/N2, V1 is primary voltage, V2 is secondary voltage, N1 is primary winding coil turns, N2 is secondary winding coil turns. Charge the transformer [pay attention to insulation, pay attention to safety], measure the secondary voltage, write it down on the paper, and measure the gear with ac voltage, i.e. ~ symbol. The secondary voltage is 20V