There are more and more types of flyback transformer frequencies, and the corresponding transformer specifications and models are becoming more and more complex, and the meanings of different types of specifications are also different.
A transformer is a device that uses the principle of electromagnetic induction to change the alternating current voltage. The main components are the primary coil, the secondary coil, and the iron core (magnetic core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc. According to the use, it can be divided into: power transformer and special transformer (electric furnace transformer, rectifier transformer, power frequency test transformer, voltage regulator, mine transformer, audio transformer, intermediate frequency transformer, high-frequency transformer, impact transformer, instrument transformer, electronic transformer, reactor, transformer, etc.). T is often used as the beginning of the number.
The models of commonly used transformers can be summarized as follows
1. According to the number of phases:
(1) Single-phase transformer: used for single-phase load and three-phase transformer bank.
(2) Three-phase transformer: used for the rise and fall voltage of the three-phase system.
2. According to the cooling method,
(1) Dry-type transformer: relying on air convection for natural cooling or increasing fan cooling, mostly used in high-rise buildings, high-speed toll stations, local lighting, electronic circuits, and other small-capacity transformers.
(2) Oil-immersed transformer: relying on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling, forced oil circulation, etc.
3. According to the use:
(1) Power transformer: used for the rise and fall voltage of the transmission and distribution systems.
(2) Instrument transformers, such as voltage transformers, current transformers, measuring instruments, and relay protection devices.
(3) Test transformer: It can generate high voltage and carry out high voltage tests on electrical equipment.
(4) Special transformers: such as electric furnace transformers, rectifier transformers, adjusting transformers, capacitive transformers, phase-shifting transformers, etc.
4. According to the form of winding:
(1) Double-winding transformer: used to connect two voltage levels in the power system.
(2) Three-winding transformer: generally used in the regional substation of the power system, connecting three voltage levels.
(3) Autotransformer: used to connect power systems with different voltages. It can also be used as an ordinary step-up or step-down transformer.
5. According to the form of the iron core:
(1) Core transformer: power transformer used for high voltage.
(2) Amorphous alloy transformer: The amorphous alloy core transformer is a new type of magnetic conductive material; the no-load current drops by about 80%, and it is a distribution transformer with an ideal energy-saving effect, especially suitable for rural power grids, developing areas, and other places with low load rates.
(3) Shell transformer: special transformer for high current, such as electric furnace transformer or an electric welding transformer; or power transformers for electronic devices, televisions, radios, etc.
Features of high-frequency Transformers
1. Current distribution
A typical high-frequency transformer has several coils connected in parallel to the secondary windings. Each secondary winding is coupled to the same primary winding. Therefore, the number of turns that occur in the secondary winding is the same as the number of turns that occur in the primary winding (negligent excitation current). This feature is particularly useful for parallel rectifier circuits. The winding current is evenly distributed, so there is no need for a current sharing resistor or other components in a parallel rectifier circuit.
2. High power density
Because of its small size, high-frequency transformer components have excellent temperature dissipation characteristics, so they can be tightly packaged with related semiconductor devices and inductors to achieve high power density. Its current density can be up to 30A/module.
3. High power
Adjust the leakage inductance so that it can have a very fast switching time and low interpolation loss, so that it can reach a high power. The turn-to-turn conduction loss between the secondary and primary windings of this transformer is very small.
4. High current density
High-frequency transformers have exceptional temperature rise characteristic planning. Because of these characteristics, it can reach high current densities in very small packages.
5. Low cost
The whole high-frequency transformer is composed of a few related cheap components, and the assembly is very convenient, so the cost of the transformer is very low.
6. Save the cost of components connected with it
Because of its low leakage inductance, the switching losses are low, and the stress applied to the parts connected to it is reduced. Therefore, the components connected to it can use low-power rated components with low cost.
7. Excellent heat dissipation characteristics
High-frequency transformers are small components with a high surface-to-volume ratio and very short hot aisles. Good for heat dissipation. The inter-turn losses between the primary and secondary windings are small. The unique geometry of this core effectively reduces core losses. So it can achieve a high magnetic flux density. It can operate between -40 °C and 130 °C.
8. Low walk-and-drain inductance
Good coupling between windings and windings keeps the leakage inductance between winding turns at a minimum. The connection from the output to the auxiliary parts is very short and tightly mounted, so the leakage inductance on the wires between the windings is also small.
9. Excellent high frequency characteristics
Previously, when the transformer was operating at high frequencies, the switching losses increased and the transformer overheated. The presentation of the plate transformer solves these problems. The flat plate transformer can be planned as a high-frequency transformer, providing a transformer module that is both economical and good. It can operate between 100kHz and 500kHz.
10. Simple structure
High-frequency transformers are made up of a few components and few windings, which are particularly suitable for automated installations.
11. Low profile
The magnetic cores used in flat plate transformers are small and can be placed on the surface of the flat plate. Each core unit is in the range of 8 mm-25 mm.
12. High dielectric strength
High-frequency transformers are easy to insulate according to the required number of insulation layers and thickness. Dielectric insulation can be carried out according to the customer's requirements for leakage distance. The withstand voltage between the primary and secondary windings is greater than 40,000V.
Group Profile
Zhuhe Group is a comprehensive service provider of electronic technology and electronic products, providing customers with professional OEM/ODM services. The group's products and technologies are diversified, including semiconductor devices, pulse motors, high-frequency transformers, inductors, PCBA (printed circuit board assembly) & FPCA (flexible printed circuit assembly), and other products, which are the core components of various electronic products.
With 10 subsidiaries, Zhuhe is a comprehensive service provider of electronic technology and electronic products, focusing on the fields of aerospace, military industry, industrial control, data communication, automotive electronics, medical electronics, new energy technology, and AI intelligent technology. At present, Zhuhe has major markets at home and abroad, and its core customers include the United States, Japan, Germany, and other domestic and foreign customers.
Our team management is very strict and focuses on the career development and training of our employees. We encourage our employees to self-improve and innovate, contributing to the development of the company while they develop themselves.
Our workshop is equipped with modern equipment and production lines, and we also pay great attention to the monitoring of the production process and quality control. Our production standards are in line with international quality certification standards and we are a popular brand.
Q:What are the transformer components made of?
A:Transformer components are mainly composed of iron core and coil, in addition to the oil tank, oil pillow, insulating bushings and tap changer.
Q:What is the use of transformer oil?
A:(1) insulating effect; (2) heat dissipation effect; (3) arc elimination effect.
Q: What is the application range of high-frequency transformers?
A:Due to its small size and high efficiency, high-frequency transformers are widely used in electronic products including communications, computers, medical equipment, military, aerospace, and other fields. Especially in modern wireless communication systems, high-frequency transformers play a very critical role.
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