Magnetic transformer may be thicker, heavier and more inefficient

For the next generation of portable fluorescent display enclosure and become thinner , therefore , creates a demand for thin CCFL power supply . Thanks to the development of magnetic ceramic piezoelectric transformers and transformer , we can create a more efficient , smaller backlight converter. Select the transformer depends on the cost , size and efficiency , and several other factors . For example , at a given power level lower than the piezoelectric transformer , the transformer may be magnetic thicker , heavier and less efficient , but it also has a greater load range and a lower cost advantage . For the PZT transformer , the operation of the sine of its inherent characteristics . In addition, it has a high excitation voltage , non-flammable and non- electromagnetic noise , etc. . A transformer for example 3-4W laptop . About the high-frequency magnetic transformer transformer works by a  mcb circuit breaker  core and a plurality of coils wound on the composition . Transitions occur between the energy flux and the magnetic core. This energy exchange is a function of current and voltage of the integral : Energy = ∫ I Vdt = ∫ H dB change in flux density in the core can be used and the field intensity is expressed ; current in the coil can also be used , to express the change of voltage and time . The magnetic flux density and V - second proportional and  power transformers  to the number of turns of the coil and the core cross-sectional area . Calculated according to Faraday 's law : current and number of turns is proportional to the intensity and the field , and inversely proportional to the length of the coil . According to Ampere 's law , it can be expressed as : The relationship between the flux density and field strength determined by the magnetic permeability of the core ;