Product Description
Principle of transformer
Figure 1 is a simplified diagram of the transformer, when a sinusoidal AC voltage U1 at both ends of the primary coil, wire is alternating current I1 and generates an alternating magnetic flux Phi 1, it along the core through primary and secondary coils to form a closed magnetic circuit. In the secondary coil induction mutual voltage U2 and phi 1 would in the primary coil induces a self inductance voltage E1, E1 direction and the direction of voltage U1 opposite and same amplitude, thus limiting the size I1. In order to keep the flux Phi 1 in the presence of needs to have certain electric energy consumption, and the transformer itself also has certain loss, although at this time secondary not yet connected to the load, in the primary coil still current. This current we call for the no-load current.
If the secondary load connected, secondary coil produces current I2, and therefore produces magnetic flux Phi 2, Phi 2 and phi 1 in contrast, cancel each other out, iron core in the total flux decreased, thereby reducing the primary inductance voltage E1, the results of the I1 increases, the visible primary current and secondary load have close relationship. When current to the secondary load increase I1 increase, Phi 1 also increased and phi 1 increase just added a is the portion of the magnetic flux Phi 2 offset, to keep the core in the total flux constant. The power of the secondary load of the transformer can be considered as the primary power from the power source if the loss of the transformer is considered.. The transformer can change the secondary voltage according to the number of the secondary coils, but can not change the power consumption of the load..
Feature
For different types of transformer has the corresponding technical requirements, available corresponding technical parameters. Power transformer main technical parameters such as: rated power, rated voltage and the voltage, rated frequency, temperature level, temperature, voltage adjustment rate, insulation and moisture-proof performance, for frequency transformer of the main technical parameters is: voltage ratio, frequency characteristics of the nonlinear distortion, magnetic shielding and electrostatic shielding efficiency.
A. voltage ratio:
Two groups of coil windings, respectively, the number of N1 and N2, N1 is primary, N2 is the secondary. The primary coil and an AC voltage, induction electromotive force generated in the secondary coil ends will. When N2>N1, the induction electromotive force to even higher than primary and voltage, the transformer known as step-up transformer: when N2<N1, the induced electromotive force below the primary voltage. The transformer is said to reduce transformer. Primary secondary voltage and the coil number has the following relationship:
The n is called the voltage ratio (the ratio of the n<1), the N1>N2, the V1>V2, the transformer is the buck transformer, the other is the boost transformer.
Efficiency of B. transformer:
At the rated power, the transformer's output power and the ratio of the input power, called the transformer's efficiency, is
ETA = x100%
In 7 / as the efficiency of the transformer; P1 power input, P2 output power.
When the transformer output power of P2 is equal to the input power P1 and efficiency ETA equal to 100%, transformer, will not generate any loss. But in fact, the transformer is not. When the total transmission power transformer to generate losses, such losses mainly copper loss and iron loss.
Copper loss refers to the loss caused by the transformer coil resistance. When the current through the coil resistance heating, the part of the electrical can is changed into heat and wear and tear. As the general coil wound by copper wire with insulation, therefore it is called for the copper loss.
Transformer iron loss includes two aspects. One is the hysteresis loss, when the alternating current through the transformer, the transformer silicon steel sheet by the magnetic field lines the direction and size change with, making the silicon steel sheet internal friction between molecules, release heat, thus loss part of power, this is the hysteresis loss. Another is eddy current loss, when the transformer works. The iron core through the magnetic field lines, in the plane perpendicular to the magnetic field lines will produce induced current, due to the current self closed loop circulation is formed and into a spiral shape, so called eddy. The existence of vortex core heat, the energy consumption and the loss that eddy current losses.
The efficiency of the transformer is closely related to the power level of the transformer. The power consumption is higher, the loss and output power is smaller, the efficiency is higher, and the power is smaller, the efficiency is lower.
Power of C transformer
The transformer core flux and the applied voltage. The excitation current in the current will not increase with the increase of the load.. Although the increase in the core is not saturated load will make the resistance loss of the coil increased more than nominal capacity due to coil to generate heat can not be timely shed, the coil can damage, if you use the coil is formed by a superconducting materials, current increases will not cause fever, but inside the transformer and magnetic flux leakage caused by impedance, but current increases, the output voltage will drop and current increases, the output voltage lower, so the transformer output impossible is infinite. If you say no, transformer impedance, then when the current flowing through the transformer will have a particularly large electric power, it is easy to damage the transformer coil, although you have a power transformer but not. It can be said that with the development of superconducting material and core material, the output power of the transformer with the same volume or weight will increase, but not infinite!
| Transformer type |
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| ER,EFD,EE,EI |
power, charing source |
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| Toroidal Transformer |
PCB power |
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Edit the loss of the transformer
When the primary winding of the transformer is energized, the flux generated by the coil in the core flow, because the core itself is a conductor, in the perpendicular to the plane of the magnetic field lines will be induced potential, the potential in the core section form closed circuit
Changzhou Southern Electronic Element Factory Co., Ltd. is located in China, with a long history. We enjoy convenient transportation by highway, railway and airway. It takes only one and half hours' Drive to Shanghai or Nanjing.
Our company was founded in 1989, and currently we employ more than 300 people, including 60 professional technicians, covering an area of 10, 000 square meters, with a construction area of more than 5000 square meters. Our main products are wirewound resistors, wirewound resistor fuses, membrane fuse resistors, fixed inductors, filters, ferrite transformers, ring-shaped coils, fuse dedicated energy-saving lamps and UL fuses. Our annual output is 200 million resistors, 200 million transformers, 100 million coils and 200 million fuses, which are mainly used for household appliances, communication equipment, energy-saving lamps, automation control devices (such as inverters), power equipment and facilities. Our products are exported to Europe, the United States and Southeast Asia. GE, OSRAM and PHILIPS are our customers.
Factory' S quality policy: "product quality, service in advance, customer satisfaction".
Environmental policy: "to comply with laws and regulations, pollution prevention, environmental awareness, continuous improvement of the environment"
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