The operating principle of the inverter
Inverter is a transformer of DC to AC. It is actually a voltage inversion process with converter. The converter is to convert the AC voltage of the power grid to a stable 12V DC output, and the inverter is to convert the 12V DC voltage of the Adapter to high frequency high voltage alternating current; the two parts also use more PWM (pulse width modulation) technology. The core part is a PWM integrated controller, Adapter uses UC3842, and inverter uses TL5001 chip. The operating voltage range of TL5001 is 3.6~40V, with an error amplifier, an regulator, an oscillator, a PWM generator with a dead zone control, a low voltage protection circuit and a short circuit protection loop.
Input interface part: the input part has 3 signals, 12V DC input VIN, working enable voltage ENB and Panel current control signal DIM. VIN is provided by Adapter, ENB voltage is provided by MCU on the motherboard, its value is 0 or 3V, when ENB=0, the inverter does not work, while ENB=3V, the inverter is in normal working state; and DIM voltage is provided by the main board, its range of variation is between 0~5V, and the different DIM values are fed back to the PWM controller feedback end, the inverter supplies the load to the load. The current will also be different. The smaller the DIM value, the greater the output current of the inverter.