You can use an inverter to turn DC into AC, and the inverter is a DC to AC transformer, which is actually a voltage inverter process with the converter. The inverter converts the 36V DC voltage output by the Adapter into high-frequency high-voltage AC; The pulse width modulation (PWM) technique is used more frequently. The core part is a PWM integrated controller, for example: some circuit Adapter uses UC3842, and the inverter uses TL5001 chip. The operating voltage range of TL5001 is 3.6~40V, which is equipped with an error amplifier, a regulator, an oscillator, a PWM generator with dead zone control, low voltage protection circuit and short circuit protection circuit.
Input interface part: The input part has 3 signals, 36V DC input VIN, working enable voltage ENB and Panel current control signal DIM.
The VIN is provided by the Adapter, the ENB voltage is provided by the MCU on the motherboard, and its value is 0 or 3V. When ENB=0, the inverter does not work, and when ENB=3V, the inverter is in normal working state. The DIM voltage is provided by the motherboard, and its variation range is between 0 and 5V, the different DIM values are fed back to the PWM controller feedback terminal, the current provided by the inverter to the load will also be different, the smaller the DIM value, the larger the inverter output current.
Voltage starting loop :ENB is high voltage, output high voltage to light the backlight tube of the Panel. PWM controller: consists of the following functions: internal reference voltage, error amplifier, oscillator and PWM, overvoltage protection, undervoltage protection, short circuit protection, output transistor.
Dc conversion: The MOS switch tube and the energy storage inductor are composed of voltage conversion circuit, and the input pulse is amplified by the push-pull amplifier to drive the MOS tube to do switching action, so that the DC voltage charges and discharges the inductor, so that the other end of the inductor can get AC voltage.
36V voltage conversion If 36V is AC, the use of 36V to 220V transformer can be increased to 220V; If 36V is direct current, use an inverter, which can change DC to AC, and then boost the voltage to 220V
The principle of 36 volts to 220 volts is: the first thing to be clear is AC and direct current. Ac voltage conversion can use a transformer, DC voltage conversion can first convert DC into AC, and then use an AC transformer to transform the voltage, and then convert the converted AC voltage into DC voltage.