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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.
More transformer in www.xp-elec.com
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).
More transformer in www.xp-elec.com
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
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.
