Electronic transformer materials are mainly Skeleton (Bobbin, Base, Case) Wire (Copper Wire) Ferrite Core (SI-Steel Lamination) Copper Foil Insulating tape (Tape) Safety tape, also known as Margin Tape Tube Chemical materials: Solder Bar, Varnish, Epoxy, Glue, Thinner, Scaling Powder, Ink
The power electronic converter (rectifier, inverter) of the power electronic transformer should include two parts: the main circuit and the control circuit. For the transformer of the power distribution system, in order to be consistent with the conventional power transformer, the power electronic converter connected to the power supply side and the corresponding winding of the corresponding high-frequency transformer are defined as the primary side; the power electronic converter connected to the load side is defined And the corresponding winding of the corresponding high-frequency transformer is defined as the secondary side. The two are connected by a high-frequency transformer.
Electronic Transformer (PET), also known as Electronic Power Transformer (EPT), Solid State Transformer (SST), and Flexible Transformer (FT), is a kind of energy that is realized through power electronics technology New transformers for transmission and power conversion. Analysis and summary of the existing power electronic transformer topology can be defined as follows: The so-called power electronic transformer is a combination of power electronic conversion technology and high-frequency power conversion technology based on the principle of electromagnetic induction. A stationary power device that implements the conversion of electrical energy of one electrical characteristic into electrical energy of another electrical characteristic. The power characteristics of the electrical energy referred to here mainly refer to the amplitude (frequency), frequency, phase, phase number, phase sequence, and waveform of the voltage (or current).
1.High efficiency, high quality materials.
2.Low working temperature and long service life.
3.Good insulation and high resistance to electric power.
4.Good anti-interference performance and high reliability.
5. Low energy consumption and high dc superposition.
Electronic transformer is a new type of power conversion equipment. It not only has the basic functions of voltage conversion, electrical isolation and energy transfer of traditional power transformers, but also can realize the adjustment of power quality, control of system power flow, and reactive power compensation. Other additional functions. The main reason why power electronic transformers can achieve these additional functions is that after introducing power electronic conversion technology and control technology, they can flexibly process and control the voltage and current amplitude and phase of the transformer’s primary and secondary sides. , And can control the flow of the system according to actual needs. Therefore, power electronic transformers can achieve more stable and flexible power transmission, can solve many problems existing in today’s power systems, and their application prospects will also be very broad.
① Small size and light weight;
② It can be cooled with air, no insulation oil is needed for isolation, reducing pollution, convenient maintenance and good safety;
③ can make the secondary side of the transformer output a constant amplitude voltage;
④ The power quality can be improved, the input current and output voltage of the sine waveform can be obtained and the unit power factor can be achieved. The voltage and current on both sides of the transformer can be controlled, so the power factor can be adjusted arbitrarily;
⑤ It has the function of a circuit breaker, and high-power power electronic devices can turn off the faulty large current instantaneously (within subtle time), eliminating the need for a relay protection device.
On the primary side, the high-voltage power line bus becomes a high-frequency AC square wave through the action of the power electronic converter, that is, the primary side increases the frequency of the voltage to achieve the effect of frequency increase. Because the volume of the transformer is related to the saturation magnetic flux density of the core material and the maximum allowable temperature rise of the winding, a transformer with a large saturation magnetic flux density is also large. The saturation magnetic flux density of the iron core material is inversely proportional to the operating frequency of the transformer, so the frequency-raising effect of the primary-side power electronic converter can increase the utilization rate of the iron core material to reduce the size of the transformer and save the transformer space. This is also a great advantage of power electronic transformers over traditional power transformers.
The application of electronic transformers in traditional lighting fixtures is very common. Almost all electronic transformers can be used for fluorescent lamps, table lamps, energy-saving lamps, advertising lamps, etc. After using electronic transformers, starters can be omitted. In LED lighting, most of the new products also use electronic transformers. The main reason is that the electronic transformer has high efficiency and low cost in terms of transformer function, saves iron and copper materials, has a small structure and light weight. The disadvantage is that the withstand voltage and high current impact resistance are worse than iron transformers.