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Views: 0 Author: Site Editor Publish Time: 2024-10-04 Origin: Site
Low-frequency transformers and high-frequency transformers mainly have the following differences:
First, the working frequency is different
Low-frequency transformer: working frequency is generally between 20Hz and 20kHz. Mainly used for utility frequency (50Hz or 60Hz) voltage conversion, such as in the power adapter, audio equipment and other common.
High-frequency transformers: the working frequency is usually above 20kHz, and can be as high as hundreds of kHz or even MHz. Widely used in switching power supplies, electronic ballasts and other high-frequency circuits.
Second, different structural characteristics
Low frequency transformer:
- Iron core is mostly made of silicon steel sheet stacked. Silicon steel sheet has a high permeability and low loss characteristics, suitable for working at low frequency. Relatively large and heavy.
- Relatively large size, heavier. Because of the low frequency needs a larger core cross-sectional area to transmit energy, so its external dimensions are usually larger than the high frequency transformer.
- Higher number of coil turns. In order to achieve the required inductance and voltage conversion ratio at low frequency, the number of coil turns is often higher.
High frequency transformer:
- Iron core generally use ferrite and other high frequency magnetic materials. Ferrite has high resistivity, can effectively reduce the eddy current loss at high frequency.
- Small size, light weight. High-frequency operation, the core can be made smaller, and relatively fewer turns of the coil, so that the overall size is greatly reduced.
- The coil is usually wound with multiple strands of fine wire or Leeds wire. This can reduce the skin effect at high frequencies and reduce the AC resistance of the coil.
Third, the function and application of different scenes
Low frequency transformer:
- The main function is to realize the voltage rise and fall, isolation and impedance matching. For example, the 220V utility voltage step-down for electronic equipment for low voltage, or in the audio amplifier for signal coupling and impedance transformation.
- Commonly used in traditional linear power supply, power transformers, audio equipment and other frequency requirements are not high occasions.
High frequency transformer:
- In high-frequency circuits mainly play the role of energy transfer, voltage conversion and electrical isolation. For example, in the switching power supply, the input high voltage is converted into a low voltage suitable for different electronic components, and realize the electrical isolation between input and output to improve safety.
- Widely used in switching power supply, communication equipment, computer power supply, frequency converter and other areas with high requirements for volume, efficiency and operating frequency.
Fourth, different efficiency
Low frequency transformer:
Due to the limitations of the core material and structure, the loss at low frequency is relatively large, and the efficiency is generally low. Especially in high-power applications, the core eddy current loss and hysteresis loss will increase significantly, resulting in lower efficiency.
High Frequency Transformers:
The use of high-frequency magnetic materials and optimized design can reduce losses and improve efficiency at high frequencies. Especially in switching power supplies and other high frequency applications, through the use of soft switching technology, etc., can further improve the efficiency of high frequency transformers.
Fifth, different design and manufacturing difficulties
Low frequency transformer:
Design is relatively simple, mainly consider the core size, coil turns and insulation and other factors. Manufacturing process is also more mature, usually hand-wound or simple winding machine can be completed.
High frequency transformer:
The design is more complex, need to consider a variety of effects at high frequencies, such as skin effect, neighborhood effect, leakage and distributed capacitance. Manufacturing requirements for high precision, usually requires the use of automated winding equipment and advanced production processes to ensure the performance and quality of the transformer.
Since establishment in 2003, Golden Gagle has continued to foucus on R&D, design, produce and sales as one of the electronic components factory, the main products: all kinds of precision, mirco inductance coils, self-adhensive hollow coils, skeleton coils, hearing aid coils, antenna coils, RFID coils, sensor coils, all kinds of modules, solenoid valve, plastic accessories and all kinds of electronic components assembly, all kinds of high-frenquency voltages, filters, inductors, to provide customers with high-quality products and wholehearted service.
