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high frequency transformer
are mainly used for power transmission and distribution system from the
power transmission, voltage conversion and insulation isolation role in
the application of the use of conditions include two aspects:
reliability and electromagnetic compatibility. Previously only pay
attention to reliability, and now due to increased awareness of
environmental protection, we must pay attention to electromagnetic
compatibility.
Reliability refers to the specific conditions of use, high-frequency power transformer can work until the normal life so far. General use conditions for high frequency power transformer is the greatest impact on the ambient temperature. Some soft magnetic materials, Curie point is relatively low, sensitive to temperature. For example, manganese zinc soft ferrite, Curie point only 215 ¡æ, magnetic flux density, permeability and loss are changing with temperature, in addition to the normal temperature of 25 ¡æ, but also given 60 ¡æ, 80 ¡æ, 100 ¡æ When the various reference data. Therefore, the temperature of manganese-zinc soft ferrite core is limited to 100 ¡æ below, that is, the ambient temperature of 40 ¡æ, the temperature rise is only allowed to less than 60 ¡æ, equivalent to A-class insulation temperature.
Electromagnetic compatibility by high frequency transformer manufacturers refers to the high-frequency power transformer does not produce external electromagnetic interference, but also to withstand external electromagnetic interference. Electromagnetic interference includes audible audio noise and non-audible high frequency noise. One of the main causes of electromagnetic interference in high frequency power transformers is the magnetostriction of the core. Magnetostrictive large soft magnetic material, resulting in large electromagnetic interference. High-frequency power transformer electromagnetic interference caused by the main reason there is the magnetic force between the core and the winding between the repulsion. The frequency of these changes in frequency and high frequency power transformer operating frequency consistent.
Shielding is to prevent electromagnetic interference, increase the high-frequency power transformer electromagnetic compatibility of a good way. However, in order to prevent the transmission of electromagnetic interference from high-frequency power transformers, the corresponding measures should be taken in the design of the core structure and the design of the winding structure. The addition of the external shield is not necessarily the best solution because it can only prevent radiation interference , Can not prevent conduction transmission interference.
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Reliability refers to the specific conditions of use, high-frequency power transformer can work until the normal life so far. General use conditions for high frequency power transformer is the greatest impact on the ambient temperature. Some soft magnetic materials, Curie point is relatively low, sensitive to temperature. For example, manganese zinc soft ferrite, Curie point only 215 ¡æ, magnetic flux density, permeability and loss are changing with temperature, in addition to the normal temperature of 25 ¡æ, but also given 60 ¡æ, 80 ¡æ, 100 ¡æ When the various reference data. Therefore, the temperature of manganese-zinc soft ferrite core is limited to 100 ¡æ below, that is, the ambient temperature of 40 ¡æ, the temperature rise is only allowed to less than 60 ¡æ, equivalent to A-class insulation temperature.
Electromagnetic compatibility by high frequency transformer manufacturers refers to the high-frequency power transformer does not produce external electromagnetic interference, but also to withstand external electromagnetic interference. Electromagnetic interference includes audible audio noise and non-audible high frequency noise. One of the main causes of electromagnetic interference in high frequency power transformers is the magnetostriction of the core. Magnetostrictive large soft magnetic material, resulting in large electromagnetic interference. High-frequency power transformer electromagnetic interference caused by the main reason there is the magnetic force between the core and the winding between the repulsion. The frequency of these changes in frequency and high frequency power transformer operating frequency consistent.
Shielding is to prevent electromagnetic interference, increase the high-frequency power transformer electromagnetic compatibility of a good way. However, in order to prevent the transmission of electromagnetic interference from high-frequency power transformers, the corresponding measures should be taken in the design of the core structure and the design of the winding structure. The addition of the external shield is not necessarily the best solution because it can only prevent radiation interference , Can not prevent conduction transmission interference.
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high frequency transformer
leakage inductance should be the primary coil generated by the magnetic
field lines can not all through the secondary coil will miss a part, so
the leakage of magnetic inductance known as leakage inductance.
The general leakage of the problem with the winding line of the law, the thickness of the interlayer insulation, winding width and many other factors. General measures to reduce leakage are:
1 Each set of windings must be tightened and distributed evenly by high frequency transformer manufacturers
2 leads to the place to be quite satisfactory, as far as possible at right angles, close to the skeleton wall
3 can not be full of a layer of the average to cover a layer full
4 insulation layer to minimize, to meet the pressure requirements and can be
5, such as more space, you can consider the extension of the skeleton, to minimize the thickness of the transformer can not blindly ask the leakage of small, reduce the leakage of the measures tend to make the distribution of capacitance increases, the distribution of high capacitance will also produce inrush current and peak voltage And the pulse at the top of the shock, resulting in increased wear and tear.
Any transformer there is leakage inductance, but the leakage inductance of the switching transformer on the switching power supply performance indicators is particularly important. Due to the existence of switching transformer leakage inductance, when the control switch off the moment will produce back electromotive force, easy to switch device over-voltage breakdown; leakage inductance can also be distributed with the circuit capacitance and transformer coil distributed capacitor oscillation circuit The circuit generates oscillations and radiates radiated energy, causing electromagnetic interference.
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The general leakage of the problem with the winding line of the law, the thickness of the interlayer insulation, winding width and many other factors. General measures to reduce leakage are:
1 Each set of windings must be tightened and distributed evenly by high frequency transformer manufacturers
2 leads to the place to be quite satisfactory, as far as possible at right angles, close to the skeleton wall
3 can not be full of a layer of the average to cover a layer full
4 insulation layer to minimize, to meet the pressure requirements and can be
5, such as more space, you can consider the extension of the skeleton, to minimize the thickness of the transformer can not blindly ask the leakage of small, reduce the leakage of the measures tend to make the distribution of capacitance increases, the distribution of high capacitance will also produce inrush current and peak voltage And the pulse at the top of the shock, resulting in increased wear and tear.
Any transformer there is leakage inductance, but the leakage inductance of the switching transformer on the switching power supply performance indicators is particularly important. Due to the existence of switching transformer leakage inductance, when the control switch off the moment will produce back electromotive force, easy to switch device over-voltage breakdown; leakage inductance can also be distributed with the circuit capacitance and transformer coil distributed capacitor oscillation circuit The circuit generates oscillations and radiates radiated energy, causing electromagnetic interference.
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In recent years, many domestic power amplifier there are different degrees of 50Hz noise, while the imported amplifier is basically not hear 50Hz noise. Analysis of multiple amplifiers and found that imported AV amplifier are not using the ring transformer, and domestic power amplifier are basically using the ring transformer.
The advantages and disadvantages of the toroidal transformers are very prominent. The advantage is no magnetic gap, magnetoresistance is very small, very little leakage, less per turn, copper loss is small, high efficiency. The disadvantage is poor resistance to magnetic saturation, a little bit of DC components can cause it to work is not normal, it is best used to transform the pure AC signal.
toroidal transformers manufacturer without load or with a pure resistance load, in the absence of magnetic saturation, the magnetic leakage interference is indeed small, but because of environmental reasons, it is not up to this condition.
The EI-shaped transformer core pairs of plug, constitute a small air gap, strong magnetic saturation, used in the usual rectifier capacitor input load circuit, the magnetic radiation interference is much smaller than the ring cattle.
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Shielding, you can use metal foil (copper foil) wrapped around the line,
both ends of the gap (both ends can not short circuit!), Copper and
local connection, or with enameled wire plus a layer, one end of the
idle, one end Connect with local. Shielding layer increases, to take up
the transformer core window capacity, therefore, the thickness of copper
foil or enameled wire diameter, try to use the minimum thickness or
minimum diameter; shielding layer increases, but also makes the
transformer winding process cumbersome, because the shielding Layer
itself must also be with the primary, secondary between the higher
dielectric strength, otherwise the hidden danger is very serious!
The usual method of audio toroidal transformer winding is done after the primary winding is completed, and then the secondary groups are wound.
Because recently wanted to build a small amp with a pre-level and a small audio toroidal transformer. Primary 220V, design conservative power of 20 watts; secondary high voltage 115V / 40mA, a group; filament 3.15V-0-3.15V / 1A, the first inter-stage shielding. EI66 iron core, an area of 2.2 * 2.8 square centimeters.
Preliminary calculation results: primary 0.22 line 1650 turns; secondary high voltage 0.15 line 863 turns; filament 0.73 line 51 turns; shield layer 0.15 line. With the window to accommodate the calculation, not only to accommodate the next, but also slightly surplus. According to the existing materials: primary 0.23 line, high voltage 0.15 line, filament wire 0.8, and then the window to accommodate the calculation, halo! Can not accommodate it! If you do not change the line, the only way is to remove the shield (including the use of insulation paper), winding system is completed, by hand shaping, or is expected to succeed.
Is the toroidal transformers for audio shield kept? Or quit? Re-weigh the principle and function of the shield: shield is also equivalent to a bypass capacitor, the main role is to the primary side of the common mode interference signal through the shield to return to the earth. Imagine: Transformer filament winding is not also one end of the ground? If I put the filament winding as a shield, between the primary and high pressure groups, not two things? Decided to try first!
So, around the primary, and do the insulation, the filament switch to 0.8 line, double and around 25.5 turns. With the usual winding order. The usual order is: primary - shield - high pressure - (other windings) filament. The order of this example is: primary - filament - high pressure (or other windings).
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The usual method of audio toroidal transformer winding is done after the primary winding is completed, and then the secondary groups are wound.
Because recently wanted to build a small amp with a pre-level and a small audio toroidal transformer. Primary 220V, design conservative power of 20 watts; secondary high voltage 115V / 40mA, a group; filament 3.15V-0-3.15V / 1A, the first inter-stage shielding. EI66 iron core, an area of 2.2 * 2.8 square centimeters.
Preliminary calculation results: primary 0.22 line 1650 turns; secondary high voltage 0.15 line 863 turns; filament 0.73 line 51 turns; shield layer 0.15 line. With the window to accommodate the calculation, not only to accommodate the next, but also slightly surplus. According to the existing materials: primary 0.23 line, high voltage 0.15 line, filament wire 0.8, and then the window to accommodate the calculation, halo! Can not accommodate it! If you do not change the line, the only way is to remove the shield (including the use of insulation paper), winding system is completed, by hand shaping, or is expected to succeed.
Is the toroidal transformers for audio shield kept? Or quit? Re-weigh the principle and function of the shield: shield is also equivalent to a bypass capacitor, the main role is to the primary side of the common mode interference signal through the shield to return to the earth. Imagine: Transformer filament winding is not also one end of the ground? If I put the filament winding as a shield, between the primary and high pressure groups, not two things? Decided to try first!
So, around the primary, and do the insulation, the filament switch to 0.8 line, double and around 25.5 turns. With the usual winding order. The usual order is: primary - shield - high pressure - (other windings) filament. The order of this example is: primary - filament - high pressure (or other windings).
More transformer in www.xp-elec.com
Any transformer there is leakage inductance, but the leakage inductance of the SMPS transformers
on the switching power supply performance indicators is particularly
important. Due to the existence of switching transformer leakage
inductance, when the control switch off the moment will produce back
electromotive force, easy to switch the device over-voltage breakdown;
leakage inductance and the circuit can be distributed in the capacitor
and the transformer coil distributed capacitor oscillation circuit The
circuit generates oscillations and radiates radiated energy, causing
electromagnetic interference. Therefore, the analysis of leakage
inductance generated by the principle and reduce the leakage inductance
is also one of the important components of the design of switching
transformers.
SMPS transformers manufacturer said, there is a leakage inductance between the switch transformer coils because of the leakage flux between the coils. Therefore, the value of the leakage inductance can be calculated by calculating the leakage flux between the coils. To calculate the leakage flux between the transformer coil, the first is to know the magnetic field distribution between the two coils. We know that the magnetic field distribution in the spiral coil is similar to the distribution of the electric field in the two plates, that is, the magnetic field intensity distribution in the spiral coil is substantially uniform and the magnetic field energy is concentrated in the helical coil. In addition, when calculating the distribution of the magnetic field intensity inside or outside the spiral coil, the more complex case can be used Maxwell's theorem or Bi-sand theorem, and the simpler case can be given by the Ampere loop law or the Kirchhoff law of the magnetic circuit.
The magnetic flux? 1 generated by the transformer primary coil N1 passes through the transformer secondary coil N2, and there should be no leakage flux therebetween; however, the direction of the magnetic flux? 1 generated in the area S1 in the area S1 and the magnetic energy generated in the area Sd2 The direction of the ¦Õ1, just opposite to each other; therefore, the transformer primary coil N1 in the area Sd2 generated in the magnetic flux ¦Õ1, still known as the transformer primary coil N1 transformer secondary coil N2 leakage flux, the equivalent inductance is also known as Leakage.
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SMPS transformers manufacturer said, there is a leakage inductance between the switch transformer coils because of the leakage flux between the coils. Therefore, the value of the leakage inductance can be calculated by calculating the leakage flux between the coils. To calculate the leakage flux between the transformer coil, the first is to know the magnetic field distribution between the two coils. We know that the magnetic field distribution in the spiral coil is similar to the distribution of the electric field in the two plates, that is, the magnetic field intensity distribution in the spiral coil is substantially uniform and the magnetic field energy is concentrated in the helical coil. In addition, when calculating the distribution of the magnetic field intensity inside or outside the spiral coil, the more complex case can be used Maxwell's theorem or Bi-sand theorem, and the simpler case can be given by the Ampere loop law or the Kirchhoff law of the magnetic circuit.
The magnetic flux? 1 generated by the transformer primary coil N1 passes through the transformer secondary coil N2, and there should be no leakage flux therebetween; however, the direction of the magnetic flux? 1 generated in the area S1 in the area S1 and the magnetic energy generated in the area Sd2 The direction of the ¦Õ1, just opposite to each other; therefore, the transformer primary coil N1 in the area Sd2 generated in the magnetic flux ¦Õ1, still known as the transformer primary coil N1 transformer secondary coil N2 leakage flux, the equivalent inductance is also known as Leakage.
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1. Electronic Transformer Principle - Introduction
Electronic transformer is the switching power supply, is the use of electromagnetic induction principle of transmission of electrical energy or electrical signals in the electronic circuit plays a boost, buck, isolation, rectifier, inverter, inverter, impedance matching, inverter, storage Can, filter and so on.
toroidal transformers with a small size, light weight, low price, widely used in various electrical appliances.
The most basic type of electronic transformer is two groups of wires around the coil inductively called together, when an alternating current (with a known frequency) flow in one group of coils, in the other set of coils will be Induction with the same frequency of the AC voltage, and the size of the induced voltage depends on the two coil coupling and the degree of magnetic cross-linked.
2. Electronic transformer principle - structure
The basic structural components of an electronic transformer are cores and windings, which make up the body of the transformer. In order to improve the cooling conditions, large and medium-capacity transformer immersed transformer body filled with transformer oil in a closed tank, the winding connection with the external circuit leads through the insulating sleeve. In order to make the safe and reliable operation of the transformer, also equipped with oil conservator, gas relays and airbags and other accessories. To sum up: electronic transformer core, winding, fuel tank, accessories and other components.
3. Electronic transformer principle - working principle
Although the size of electronic transformer from toroidal transformers manufacturers disparity, use different, but its basic structure and working principle is the same. It is made using the principle of electromagnetic induction, and its main function is to transfer electricity from one circuit to another circuit or transmit signals, power transmission or as an important component of signal transmission. Electronic Transformer Schematic The following figure shows:
The main component of the electronic transformer is a core and two windings on the core. The two windings have no magnetic coupling. When the transformer primary winding with alternating voltage, the core will produce alternating magnetic flux, respectively, in the two winding induction electromotive force e1, e2. According to the law of electromagnetic induction can write out the instantaneous electromotive force equation:
As long as the following two conditions can meet the purpose to change the voltage:
1) The amount of flux change
2) The number of turns of the primary and secondary windings is different.
www.xp-elec.com is a professional transformer manufacturer in China.
Electronic transformer is the switching power supply, is the use of electromagnetic induction principle of transmission of electrical energy or electrical signals in the electronic circuit plays a boost, buck, isolation, rectifier, inverter, inverter, impedance matching, inverter, storage Can, filter and so on.
toroidal transformers with a small size, light weight, low price, widely used in various electrical appliances.
The most basic type of electronic transformer is two groups of wires around the coil inductively called together, when an alternating current (with a known frequency) flow in one group of coils, in the other set of coils will be Induction with the same frequency of the AC voltage, and the size of the induced voltage depends on the two coil coupling and the degree of magnetic cross-linked.
2. Electronic transformer principle - structure
The basic structural components of an electronic transformer are cores and windings, which make up the body of the transformer. In order to improve the cooling conditions, large and medium-capacity transformer immersed transformer body filled with transformer oil in a closed tank, the winding connection with the external circuit leads through the insulating sleeve. In order to make the safe and reliable operation of the transformer, also equipped with oil conservator, gas relays and airbags and other accessories. To sum up: electronic transformer core, winding, fuel tank, accessories and other components.
3. Electronic transformer principle - working principle
Although the size of electronic transformer from toroidal transformers manufacturers disparity, use different, but its basic structure and working principle is the same. It is made using the principle of electromagnetic induction, and its main function is to transfer electricity from one circuit to another circuit or transmit signals, power transmission or as an important component of signal transmission. Electronic Transformer Schematic The following figure shows:
The main component of the electronic transformer is a core and two windings on the core. The two windings have no magnetic coupling. When the transformer primary winding with alternating voltage, the core will produce alternating magnetic flux, respectively, in the two winding induction electromotive force e1, e2. According to the law of electromagnetic induction can write out the instantaneous electromotive force equation:
As long as the following two conditions can meet the purpose to change the voltage:
1) The amount of flux change
2) The number of turns of the primary and secondary windings is different.
www.xp-elec.com is a professional transformer manufacturer in China.
Electronic transformer definition:
Electronic transformer, with the alternating current voltage into the DC and then through the semiconductor switching devices and electronic components and high-frequency transformer windings constitute a high-frequency AC voltage output of electronic devices, but also in the electronic theory of a described Intersection and Intersection Inverter.
In short, it is mainly by the high-frequency transformer core (core) and two or more coils, they do not change position, from one or more of the electrical circuit, through the exchange of electricity by electricity Magnetic induction, into the AC voltage and current. In the high-frequency transformer output, for one or more of the electricity circuit, the supply of different voltage levels of high-frequency AC or DC. More industry content can query the electronic transformer industry analysis and market research report.
Electronic Transformer Category:
According to the frequency of classification:
Frequency transformer: operating frequency of 50Hz or 60Hz
IF transformer: operating frequency of 400Hz or 1KHz
Audio frequency transformer: Operating frequency is 20Hz or 20KHz
Super audio transformer: more than 20KHz, not more than 100KHz
High-frequency transformers: operating frequency is usually on the KHz to hundreds of KHz or more.
By use classification:
Power transformer: A transformer used to supply the power required by an electronic device
Audio Transformer: Transformers used in audio amplification circuits and audio equipment
Pulse transformer: the work of the pulse circuit in the transformer, the waveform is generally unipolar rectangular pulse
toroidal transformers
SMPS transformers
Special Transformer: Transformer with a special function, such as parameter transformers, voltage regulators, super-isolated transformers, transmission line transformers, magnetic flux leakage transformers
Switching Power Supply Transformer: used in switching power supply circuit in the transformer
Communication transformer: used in the communication network from the straight, filtered transformer
get transformer in www.xp-elec.com
Electronic transformer, with the alternating current voltage into the DC and then through the semiconductor switching devices and electronic components and high-frequency transformer windings constitute a high-frequency AC voltage output of electronic devices, but also in the electronic theory of a described Intersection and Intersection Inverter.
In short, it is mainly by the high-frequency transformer core (core) and two or more coils, they do not change position, from one or more of the electrical circuit, through the exchange of electricity by electricity Magnetic induction, into the AC voltage and current. In the high-frequency transformer output, for one or more of the electricity circuit, the supply of different voltage levels of high-frequency AC or DC. More industry content can query the electronic transformer industry analysis and market research report.
Electronic Transformer Category:
According to the frequency of classification:
Frequency transformer: operating frequency of 50Hz or 60Hz
IF transformer: operating frequency of 400Hz or 1KHz
Audio frequency transformer: Operating frequency is 20Hz or 20KHz
Super audio transformer: more than 20KHz, not more than 100KHz
High-frequency transformers: operating frequency is usually on the KHz to hundreds of KHz or more.
By use classification:
Power transformer: A transformer used to supply the power required by an electronic device
Audio Transformer: Transformers used in audio amplification circuits and audio equipment
Pulse transformer: the work of the pulse circuit in the transformer, the waveform is generally unipolar rectangular pulse
toroidal transformers
SMPS transformers
Special Transformer: Transformer with a special function, such as parameter transformers, voltage regulators, super-isolated transformers, transmission line transformers, magnetic flux leakage transformers
Switching Power Supply Transformer: used in switching power supply circuit in the transformer
Communication transformer: used in the communication network from the straight, filtered transformer
get transformer in www.xp-elec.com
