Electronic transformers, after the mains alternating voltage into a DC by semiconductor switching devices and electronic components and high-frequency transformer winding constitutes a high frequency AC voltage output of electronic devices, also in electronics in the theory described the kind of AC-DC converter circuits. In short, it is mainly made of high-frequency transformer magnetic cores (core) and composed of two or more coils, they do not change position, from one or more electric circuits through the exchange of power with the help of electromagnetic induction, turned into alternating voltage and current. In the output of high frequency transformer, to one or more electric circuits, high-frequency AC or DC supply different voltages.
Fundamentals of electronic transformer
Is simple no-load transformer is made up of magnets and two windings of the closed, one winding is connected to AC power, called the primary winding Np, another winding can connect to the load phase, known as the secondary winding of Ns.
Primary windings connected with AC voltage Ui power, alternating power in the winding Io, Io called on load current. The current established close along the magnetic circuit of magnetic core of alternating magnetic flux, magnetic flux at the same time across the primary winding and a secondary winding, produced in the primary winding of self-induced EMF of E1, E2 transformer electromotive, E1:E2=Ns:Np.
Features
Electronic transformer
Electronic transformer, entered as AC220V, output is AC12V, the power is over 50W-300W. It is mainly in the high-frequency electronic ballast circuit developed on the basis of a transformer circuit, stable performance, small size, power, thus overcoming the traditional silicon steel transformer of large, heavy, high price disadvantage.
Electronic transformer is non-regulated switching power supply, it is really a inverter. First power AC into DC electricity. then use electronic components to form a high-frequency oscillator into high-frequency AC DC, using of switch transformer voltage output needed, and then the second rectification power supply is used. Switching power supply with small size, light weight, low prices, so is widely used in a variety of electrical appliances.According to the high frequency switching valve driving mode of different, can be divided into self-excited oscillation-excited with him.
