Electronic transformer is mainly composed of high-frequency transformer core (iron core) and two or more coils. They do not change their positions from one or more electrical circuits to AC voltage and current through AC power with the help of electromagnetic induction. In electronic circuits, it plays the roles of step-up, step-down, isolation, rectification, frequency conversion, phase inversion, impedance matching, inversion, energy storage, filtering and so on. 2. Working principle of electronic transformer - composition
A simple transformer is composed of a closed conducting magnet and two windings, one of which is connected to the AC power supply, called the primary winding NP, and the other winding can be connected to the load, called the secondary winding ns. If the primary winding is connected to the power supply of AC voltage UI and the transformer is at no-load, the alternating power supply IO is generated in the primary winding, IO is called no-load current.
3. Working principle
Electronic transformer is a non regulated switching power supply, which is actually an inverter. Firstly, the alternating current is rectified into direct current, and then a high-frequency oscillator is composed of electronic components to change the direct current into high-frequency alternating current, output the required voltage through the switching transformer, and then secondary rectification is used for electrical appliances. Switching power supply has the advantages of small volume, light weight and low price, so it is widely used in various electrical appliances. According to the different driving modes of high-frequency switch, it can be divided into self-excited oscillation type and other excitation type.
4. Working principle - Application
It is widely used in traditional lighting lamps, such as fluorescent lamps, table lamps, energy-saving lamps, advertising lamps, etc. almost all can use electronic transformers, and the starter can be omitted after using electronic transformers. In LED lighting, most of the new products also use electronic transformers. The electronic transformer has the advantages of high efficiency, low cost, saving iron and copper materials, small structure and light weight. The disadvantage is that the withstand voltage and high current impulse resistance are worse than that of iron transformer.
