There are three signals in the input part, 12V DC input VIN, working enable voltage ENB and Panel current control signal DIM. The voltage of ENB is provided by Adapter, which is provided by MCU on the motherboard, and its value is 0 or 3V. when ENB=0, the Inverter does not work, but when ENB=3V, the Inverter is in normal working state. The DIM voltage is provided by the main board, and its range is 0 ~ 5V. If different DIM values are fed back to the feedback end of PWM controller, the current provided by Inverter to the load will be different. The smaller the DIM value, the greater the current output by Inverter.
When ENB is at high level, it outputs high voltage to light the backlight of Panel.
It consists of the following functions: internal reference voltage, error amplifier, oscillator and PWM, over-voltage protection, under-voltage protection, short-circuit protection and output transistor.
A voltage conversion circuit is composed of a MOS switch tube and an energy storage inductor. The input pulse is amplified by a push-pull amplifier and then drives the MOS tube to switch, so that the DC voltage charges and discharges the inductor, so that the other end of the inductor can get the AC voltage.
LC oscillation and output circuit:
Ensure the voltage of 1,600 V required for lamp startup, and reduce the voltage to 800V after lamp startup.
Output voltage feedback:
When the load is working, the sampled voltage is fed back, which plays a role in stabilizing the voltage output of Inventer.
In short, an inverter is a portabel AC power supply that converts low voltage (12 V,24 V,48 V) into 220 V. As 220 V AC is generally rectified into DC, the inverter is the opposite, hence its name. This is a "mobile" era, with mobile office, mobile communication, mobile leisure and entertainment. In the process of sports, not only the high-voltage DC power provided by batteries or storage batteries, but also the 220 V AC power, which is essential in life.