What is the difference between a high frequency transformer and a normal transformer?Aren t they wor

The same inductance, with the increase of the frequency of the inductance gradually increases, so in order to adapt to the transmission of high-frequency signals, the transformer must be less turns to adapt to the frequency, even winding into a hollow coil, microwave transmission some winding into 3 4 turns or 1 2 turns, etc. There is a place where electrical and transformer knowledge is quite good, you can learn about it. Check Zhejiang Emerson Electric, Zhejiang Emerson Electric has a lot of good electrical information.

There is a place where electrical and transformer knowledge is quite good, you can come and learn about it. Because the ordinary transformer works in the power frequency, it must rely on the magnetic flux generated by the core to carry out voltage conversion, because the magnetic flux can not be supersaturated, so it must be wound around the coil per volt turn in order to make it work in the best state, and the high-frequency signal is induced to the secondary with its radiation ability.

They work the same way.

The principle is the same, except that the high-frequency transformer meets the high-frequency operation, while the ordinary transformer is only suitable for the public frequency power supply.

1. Ferrite core for high-frequency transformer, silicon steel sheet for power frequency transformer. 2. The number of turns of high-frequency transformer is small, and the number of turns of power frequency transformer is large. 3. The frequency of the high-frequency transformer is above 20kHz, the power frequency is 50, and the high frequency is generated by the vibration of electronic components.

Most of the power frequency is generated by generators, and the low power is completed by inverters.

First, the types are different.

1. High-frequency transformer: It is a power transformer with a working frequency exceeding the intermediate frequency (10kHz).

2. Ordinary transformers: according to their uses, they can be divided into: power transformers and special transformers (electric furnace transformers, rectifier transformers, power frequency test transformers, voltage regulators, mining transformers, audio transformers, intermediate frequency transformers, high-frequency transformers, impact transformers, instrument transformers, electronic transformers, reactors, transformers, etc.).

Second, the functions are different.

1. High-frequency transformer: It is mainly used as a high-frequency switching power supply transformer in high-frequency switching power supply, and is also used as a high-frequency inverter power transformer in high-frequency inverter power supply and high-frequency inverter welding machine.

2. Ordinary transformer: power transformer: used for the rise and fall voltage of the transmission and distribution system.

Instrument transformers: such as voltage transformers, current transformers, measuring instruments and relay protection devices. Test transformer:

It can generate high voltage and conduct high voltage tests on electrical equipment.

A high-frequency transformer is a specialized electronic component that converts the input voltage into high-frequency alternating current and is used in many high-frequency electrical training equipment and applications. Common uses include:

1.Power supply: High-frequency transformers can be used in various types of power supplies, such as televisions, computers, lighting equipment, household appliances, industrial equipment, etc. They are capable of converting the input supply voltage to a high-frequency voltage suitable for the device's use.

2.Communication: High-frequency transformers are also widely used in wireless communication systems, such as mobile phones, wireless local area networks (WLAN), baseband circuits, etc., which can help devices transmit input and output signals at different frequencies.

3.Automotive electronics: High-frequency transformers are also used in automotive electronic systems, such as engine controllers, entertainment systems, air conditioning systems, and lighting systems, to achieve efficient energy consumption for various equipment in the vehicle.

All in all, high-frequency transformers are widely used in many electronic devices and applications, especially some equipment and systems that require high-efficiency, high-frequency, and high-precision power supplies. Worthy of shouting.

High-frequency transformer is the most important component of switching power supply, and there are many topologies in switching power supply. The following will introduce to you the working principle and use of high-frequency transformers. Hope it helps.

1. The working principle of high-frequency transformer.

A transformer is a device that converts AC voltage, current and impedance, and when there is an AC current in the primary coil, an AC magnetic flux is generated in the core (or core), so that the voltage (or current) is induced in the secondary coil. The transformer is composed of an iron core (or magnetic core) and a coil, the coil has two or more windings, of which the winding connected to the power supply is called the primary coil, and the rest of the windings are called secondary coils.

Second, the design principle of high-frequency transformer.

In the design of high-frequency transformers, the leakage inductance and distributed capacitance of the transformer must be minimized, because the high-frequency transformers in switching power supplies transmit high-frequency pulsed square wave signals. During the transients of transmission, leakage inductance and distributed capacitance cause surge ridge currents and voltage spikes, as well as top oscillations, resulting in increased losses. Generally, the leakage inductance of the transformer is controlled to 1% and 3% of the primary inductance.

The leakage inductance of the primary coil --- the leakage inductance of the transformer is caused by the magnetic flux between the primary coil and the secondary coil, between the layers, and between the turns without the complete coupling of the bridge.

The distributed capacitance is called --- distributed capacitance between the transformer winding turns, between the upper and lower layers of the same winding, between different windings, and between the winding and the shielding layer.

The primary winding --- primary winding should be placed in the innermost layer, so that the length of each turn of the transformer primary winding can be the shortest, so that the whole winding can use the least wire, which effectively reduces the distributed capacitance of the primary winding itself.

After the secondary winding --- primary winding, it is necessary to add (3 5) layers of insulating pads and then wind the secondary winding. In this way, the capacitance of the capacitance distributed between the primary winding and the secondary winding can be reduced, and the dielectric strength between the primary and secondary windings can also be increased, which meets the requirements of insulation withstand voltage.

Bias winding--- bias winding between primary and secondary, or wound in the outermost layer, and the adjustment of the switching power supply is related to whether it is based on the secondary voltage or the primary voltage.

3. High-frequency transformer use.

The high-frequency transformer is a power transformer with a working frequency of more than the medium frequency (10kHz), which is mainly used as a high-frequency switching power transformer in high-frequency switching power supply, and is also used as a high-frequency inverter power transformer in high-frequency inverter power supply and high-frequency inverter welding machine. According to the working frequency, it can be divided into several grades: 10khz-50khz, 50khz-100khz, 100khz 500khz, 500khz 1MHz, 1MHz or more.

In the case of relatively large transmission power, IGBT is generally used for power devices, and the working frequency is relatively low due to the tailing and residual slippage of the shutdown current of IGBT. If the transmission power is relatively small, MOSFET can be used, and the working frequency is relatively high.

Difference Between High Frequency Transformer and Low Frequency Transformer:1. There is no difference between high-frequency transformers and low-frequency transformers in principle.

2. The frequencies of high-frequency transformers and low-frequency transformers are different in high frequency and low frequency.

3. The iron cores used in the two transformers are different

Low-frequency transformers generally use silicon steel sheets with high permeability;

High-frequency transformers use high-frequency ferrite cores.

4. The number of coils of high-frequency transformers is different from that of low-frequency transformers

With the same inductance, the inductance of the high-frequency transformer gradually increases with the increase of frequency, and in order to comply with the high-frequency transmission and transmission, the transformer must follow the frequency with a small number of turns, or even wound into an air-core coil. Microwave preaching and delivery, some are wound in 3 4 turns or 1 2 turns, etc.

Because the ordinary transformer is the power frequency, it must rely on the magnetic flux generated by the core to carry out voltage conversion, because the magnetic flux can not be too full, and the coil must be wound according to each volt turn in order to make it in the best state, and the high-frequency transformer is induced to the secondary with its radiation ability.

It's just that the magnetic material is different, and nothing else is different.

Are these two things comparable in different places? Power frequency transformer is used for 50Hz AC transformer, high-frequency transformer is widely used, radio transmitter, radio, high-frequency heating, switching power supply, etc. can see the figure of high-frequency transformer.

1. The power frequency transformer is bulky, large in size and low in efficiency. However, the waveform is not distorted, and the circuit is simple, so the internal act rate is low.

2. The high-frequency variable pressure converter is light, small and has high efficiency. The reduction to a sine wave is distorted and the circuit is complex. The failure rate is high.

3. Relatively speaking, high-frequency transformers have greater advantages.

4. In general, whether it is electronic or electrical, the high-frequency transformer is the trend. However, with the existing technology, high-frequency transformers cannot completely replace power-frequency transformers, especially high-power and power transformers.

1. The difference between magnetic materials: the power frequency transformer uses silicon steel sheet as the core material; High-frequency transformers are made of ferrite core material.

2. The difference in working frequency: the working frequency of the power frequency transformer generally refers to the power supply frequency of 50Hz and 60Hz; The working frequency of high-frequency transformers is generally above 1kHz, or even tens of kHz or hundreds of kHz, and the application range is different for different frequencies.

3. Application: Power frequency transformers are generally used to convert 220V or 110V power frequency high voltage into power frequency low voltage for power supply of small household appliances (such as soybean milk machine, range hood, audio, etc., with a wide range of applications; High-frequency transformers are used in a wide range of applications (e.g.; Mobile phone chargers, electronic ballasts, switching power supplies, color TV power supplies, computer power supplies, LCD drivers and power supplies, etc. are used on many occasions).

The power frequency transformer is made of iron core, which is stacked with silicon steel sheets, and the number of coil turns is more; High-frequency transformers use air cores or ferrite cores, and the number of coil turns is less.

The basis of the inverter is a set of thyristor inverter, which is the principle of learning the AC speed regulation circuit of the thyristor inverter. The reason is that its protection circuits and frequency conversion drives are controlled by the microprocessor, and the input instructions and output controls can also be displayed. It is the implementation of numerical control for the inverter circuit, and the internal program has CPU, RAM, ROM storage and instructions, and some functions can also be done through buttons.

In fact, it is a reliable output AC device, and he must ensure that the frequency of the output voltage is qualified.

The transformer is a device that changes the voltage, that is, the 220 thousand volt substation is changed to 110 thousand volts, 10 thousand volts and then 220 volts, which is the electricity conversion equipment that we usually use.

Inverter: through which the frequency of electricity consumption (50Hz, 60Hz, etc.) is reached, to meet our special needs for electricity consumption.

Transformer: It is a "voltage regulator", near the community or near the factory, its function is to drop the ultra-high voltage to the normal electricity voltage of our residents to meet people's daily electricity consumption.

Hello:——1. [Inverter]: The inverter can change the frequency, [at the same time, it also changes the voltage accordingly].

This is because when the frequency of an inductive load (such as an electric motor) decreases, the inductive reactance also decreases, and the voltage must be reduced at the same time to prevent the current from exceeding the rated value! When it was first introduced in the last century, the inverter used for frequency modulation, voltage regulation, and speed regulation devices was called "triple V technology", which is the reason.

2. [Transformer]: As the name suggests, a transformer is a device that changes the voltage. Transformers are generally used at specific frequencies (such as power frequency, or high frequency). When used as a change voltage, the frequency is constant, which is its distinctive feature.

Literally: the former converts the frequency, and the latter transforms the voltage.

Structurally speaking: the former is a complex electronic device, the latter is a relatively simple device.

In terms of working principle:

Inverter: First, the input AC rectification is filtered, and the control circuit outputs a modulation signal according to the demand, which controls the conduction and closure of the power output tube (generally a half-bridge or a full-bridge), and obtains the corresponding output frequency by changing the on-on and off-time.

Transformer: In the general sense, the transformer is a component composed of multiple coil windings and magnetic cores, after applying AC voltage on one of the windings, an induced voltage will be generated on the other winding, the voltage ratio is the ratio of the number of turns of the winding, the main peak of the output frequency is the same as the input, and the harmonics are mainly even.