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Ultra thin lamp box built-in power supply ballast transformer 12V1.5A2A3A4A5A foot power

10 years old factory quality is stable, 2 years replacement, new spot delivery

discount 70% in 2018-07-20 to 2018-07-22
price: USD$ 11.90
freight :USD$18.00,(Express)
freight :USD$7.00,(Postal parcel)
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This product is suitable for ADSL, Modem (CAT), router. Mini TV, 2.5 inch mobile hard disk, DVD, mobile TV boxes, wireless audio equipment, charging equipment, need to use 12V1A DC MP3/MP4, small lamps, switches, game machine, telephone, lights, camera, monitor, controller and other home / portable devices! (note that the interface is the same to use.)


Input / output voltage AC 100V-240V
Frequency 50-60HZ
10A/220V when starting shock current in cold state
Leakage current <0.5mA AC 220V
Output 12V1A

And noise (mvp-p) <1% output voltage
The temperature coefficient is 0.02%
Start time <1S (AC 220V input Io=10%)
Overload protection protects power rating from 105% to 150%
Automatic recovery overvoltage protection 115% ~ 135% voltage nominal planting
Insulation strength input output AC 2000V/10 sec
Insulation resistance input - output >50M, DC 500V
The environmental working temperature is 0~45, 20% ~ 90%RH
Storage temperature -20 ~ 85 ~ 10% ~ 95%RH
Altitude <2.000M
The cooling form of structure is natural cold
Special switching power supply for advanced CCD camera
Wide input voltage range
High performance price ratio
Input overvoltage, overload protection
Continuous short circuit output guarantee

Detailed parameters:

Input: 100-240V50-60Hz

Output: 12VDC1A

Output current: 1000AMAX

DC line: 1 meters

Plug: default 5.5*2.5 (inner band spring can also be used for 5.5*2.1)

Set top box interface 3.5*1.35 (need to contact with customer service)



Transformer(Transformer) is a device which uses the principle of electromagnetic induction to change AC voltage. The main components are primary coil, secondary coil and iron core (magnetic core). The main functions are voltage conversion, current conversion, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer) and so on. According to the use can be divided into:Power transformerAnd special transformer (electric furnace transformer, rectifier transformer, power frequency test transformer, voltage regulator, mining transformer, audio frequency transformer, intermediate frequency transformer, high frequency transformer, impact transformer, instrument transformer, electronic transformer, reactor, transformer, etc.). Circuit symbols are often used as the beginning of numbers. Examples: T01, T201, T, etc..


Development history

FaradayIn August 29, 1831, a "inductance ring" was invented, called "Faraday induction coil", which was actually the first transformer prototype in the world. But Faraday just used it to demonstrate the principle of electromagnetic induction, without considering that it could be practical.
法拉第感应线圈Faraday induction coil
In 1881, Lucien Goral (LucienGaulard) and John Dixon Gibbs (JohnDixonGibbs) demonstrated a device called "two hand generator" in London, and then sold it to the United StatesWestinghouseThis may be the first practical power transformer, but not the earliest transformer.
In 1884, Lucien Goral and John Dixon Gibbs demonstrated their equipment in Italy, Turin, using electric lighting. The early transformers adopted linear cores and were replaced by more efficient toroidal cores.
WestinghouseThe Engineer William Stanley, who bought the transformer patent from George WestingHouse, Lucien Goral and John Dixon Gibbs, made the first practical transformer in 1885. Later, the core of the transformer was stacked with E shaped iron pieces, and began commercial use in 1886.
Transformer transformer principle was first discovered by Faraday, but it was not until nineteenth Century 80s to start the actual application. It should be output in the power plantDirect currentandalternating currentAlternating current is one of the advantages of using transformers in competition. The transformer can convert the electric energy into the form of high voltage and low current, and then switch back, thus greatly reducing the loss of electric energy in the process of transportation, making the economic energy transmission distance farther. As a result, power plants can be built far from electricity. Most of the electricity in the world goes through a series of pressure changes to reach the user.

Working principle

The transformer consists of an iron core (or magnetic core) and a coil, and the coil has two or more windings, wherein the winding of the power supply is called a primary coil, and the rest of the winding is called a secondary coil. The winding is composed of two windings. It can change AC voltage, current and impedance. The simplest core transformer consists of an iron core made of a soft magnetic material and coils with two turns varying on the core, as shown in the diagram.
变压器原理Transformer principle
The function of the core is to strengthen the spacing between the two coilsMagnetic coupling. In order to reduce the internal eddy current andHysteresis lossThe iron core is made up of painted silicon steel sheets; there is no electrical connection between the two coils; the coils are wound by insulated copper wires (or aluminum wires). A coil connected AC power is referred to as the primary coil (or the original coil), and the other coil is connected to the secondary coil (or secondary coil). The actual transformer is very complex, inevitably copper loss (coil resistance heating), iron loss (iron core heating) and magnetic leakage (through the air closed magnetic induction line), etc., in order to simplify the discussion, only ideal transformer is introduced here. The ideal transformer is set up as follows: ignoring the leakage flux, ignoring the resistance of the primary and secondary coils, ignoring the loss of the core, ignoring the no-load current (the current in the coil of the primary coil open with the secondary coil). For example, when the power transformer runs at full load (the output power of the secondary coil), it is close to the ideal transformer.
The transformer is utilizedelectromagnetic inductionStatic electric appliance made of principle. When the primary coil of the transformer is connected to the AC power supply, alternating magnetic flux is generated in the iron corefluxExpressed by means of phi. The pHi in the primary and secondary coils is the same, and the phi is also a harmonic function. It is shown as a = = MSIN t. fromFaraday's law of electromagnetic inductionIt can be seen that the induced electromotive force in the primary and secondary coils is e1=-N1d, /dt, e2=-N2d, /dt. The N1 and N2 are the turns of the primary and secondary coils in the formula. The figure shows that U1=-e1, U2=e2 (primary coil physical quantity by subscripts 1, secondary coil physical quantity with subscripts 2, said the complex effective value) U1=-E1=jN1 U2=E2=-jN2, Omega Phi Phi Omega, k=N1/N2, said transformer. The ratio of the effective value of the primary and secondary coil voltage is equal to the number of turns, and the bit difference between the primary and secondary coil voltages is U1/U2=-N1/N2=-k.
And then come to:
When the no-load current can be neglected, there is a I1/I2=-N2/N1, that is, the effective value of the current of the primary and secondary coils is inversely proportional to the number of turns, and the phase difference is equal to pi.
And then available
I1/ I2=N2/N1
The power of the primary and secondary coils of ideal transformer is equal to P1=P2. The ideal transformer itself has no power loss. The actual total loss of the transformer, its efficiency is =P2/P1. The efficiency of the power transformer is very high, up to 90%. [1]