The inverter is a DC to AC transformer, which in fact is a process of the transformation of voltage inverter. AC voltage converter is the grid into a stable 12V DC output, while the output of the inverter is the Adapter 12V DC voltage into a high voltage alternating current high frequency; the same two elements have adopted with more than a pulse width modulation (PWM) technique. Its core is an integrated PWM controller, Adapter using UC3842, the inverter is used TL5001 chip. TL5001 operating voltage range of 3.6 ~ 40V, its interior has an error amplifier, a regulator, oscillator, PWM control with dead generator, low-voltage protection circuit and short circuit protection circuit and so on.