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High Frequency Electronic Transformer Supplier in China
There are many versions of high-frequency electronic transformers. Today, let a manufacturer with more than ten years of R&D and manufacturing of electronic transformers tell you what is a high-frequency electronic transformer.
High-frequency electronic transformers are electronic transformers with high operating frequency, generally higher than 20kHz.
The precise definition is an electronic transformer with high operating frequency. Generally, the operating frequency is higher than 20kHz, which is high frequency.
The definition of high-frequency electronic transformer is very clear, but it is misled by some opinions published by some domestic experts. In order to restore the true colors of high-frequency electronic transformers, it is necessary to clarify the concepts of transformers, electronic transformers, and high-frequency electronic transformers in order to eliminate those misunderstandings.
First, what is a transformer? A transformer that works on the principle of electromagnetic induction refers to adding an alternating voltage to the primary winding of the coil to generate alternating magnetic flux, and to induce an output voltage on the secondary winding to transmit energy, transform voltage (or signal), and electrically insulate The role of isolation.
To generate electromagnetic induction, an alternating voltage must be applied to the primary winding, and it is impossible to have a transformer with a DC voltage as a working power supply. The statement that DC voltage is used as the working power supply is a misunderstanding of including the DC-to-AC inverter or variable frequency power supply within the scope of the transformer.
As long as there is electromagnetic induction, the transformer can work without a magnetic core. For example, an electronic transformer with a working frequency of MHz is a hollow transformer made of a printed circuit board. The statement that the high-frequency electronic transformer is "a magnetic transformer used in a frequency conversion circuit" is a double misunderstanding that not only includes the frequency conversion circuit in the scope of the transformer, but also thinks that the transformer must have a magnetic core.
Regardless of the operating frequency of the transformer, it transmits energy through electromagnetic induction. The amount of transmitted energy is related to the material, structure, size and operating frequency of the transformer. If the energy to be transmitted is a fixed value, the working frequency is high, the number of energy transmissions within a certain period of time is large, and the energy transmitted each time can be less, then the transformer uses less materials and has a smaller structural size. It is a misunderstanding that the transmission energy of the transformer is limited and high frequency should be used to increase the transmission energy. Using pulse width modulation (PWM) to change the transmission energy and voltage of the transformer is just an additional control method, not only high-frequency transformers can be used, but low-frequency transformers can also be used. It is also a misunderstanding to think that after PWM control, the high-frequency transformer and the low-frequency transformer have different energy transmission methods, and the high-frequency transformer and low-frequency transformer have different ways of changing voltage.
Second, find out what is an electronic transformer? Electronic transformers are transformers used in electronic circuits and electronic equipment. If the scope is expanded, it includes electromagnetic components such as transformers, inductors, and transformers used in all electronic circuits and electronic equipment. Electronics are not limited to power electronics (the more common term in China is power electronics), but also include industrial electronics, information electronics, wireless electronics and microelectronics. Although electronic transformers are different from power transformers, they are not different from radio frequency signal transformers. Limited to "power transformers in switching power converter circuits". Power transformers are just one type of electronic transformer. If the electronic transformer is only regarded as a power transformer, it will inevitably be a prison. Therefore, it is a misunderstanding to limit electronics to power electronics and electronic transformers to power transformers.
Again, figure out what is a high frequency electronic transformer? Now, there is a common saying for the high, medium and low division of the working frequency of electronic transformers, that is, the working frequency of 50Hz or 60Hz is called power frequency, or the one below it is called low frequency; 60Hz to 20kHz is called intermediate frequency, and 400Hz is intermediate frequency, not Power frequency; above 20kHz is called high frequency. Why choose 20kHz as the limit? Because 20kHz is the upper limit of the audio frequency, beyond which no audible noise can be heard. Therefore, the working frequency exceeds 20kHz, from 20kHz to MHz level, GHz level is high frequency. There are two misunderstandings in the reference to electronic transformers that "apply frequency ranges from tens of kHz to several mega kHz": one is 20 kHz, which is different from tens of kHz. One is a few GHz, not a few mega kHz (Note: Please follow the prefix of the specification, you can't make it yourself).
High frequency can also be divided into higher frequency (20kHz ~ 50kHz), medium high frequency (50kHz ~ 200kHz), high frequency (200kHz ~ 1MHz), ultra high frequency (above 1MHz), but they are all high frequency, not because they are applicable The power is different, but there are different understandings of high frequencies. It is a misunderstanding to say that there are different ranges of high frequencies at different powers.
