Working principle of inverter

1. An inverter is a DC to Ac transformer, which is actually a voltage inversion process with the converter. The converter converts the AC voltage of the power grid into a stable 12V DC output,
while the inverter converts the 12 DC voltage output by the adapter into high-frequency high-voltage AC; Both parts also use the commonly used Pulse Width Modulation (PWM) technology.
The core part is all a PWM integrated controller, with the adapter using UC3842 and the inverter using TL5001 chip. The working voltage range of TL5001 is 3.6-40V, and it is internally equipped
with an error amplifier, a regulator, oscillator, PWM generator with dead zone control, low-voltage protection circuit, and short-circuit protection circuit

2. Input interface part: The input part has 3 signals, 12V DC input VI N, working enable voltage ENB, and Pan current control signal DM. VI N is provided by the adapter, and the ENB voltage is
provided by the MCU on the motherboard, with a value of 0 or 3V. When ENB=0, the inverter does not work, while when ENB=3V, the inverter is in normal working state; The DM voltage is
provided by the motherboard, with a variation range of 0-5V. Different DM values are fed back to the feedback end of the PWM controller, and the current provided by the inverter to the load
will also vary. The smaller the DM value, the greater the output current of the inverter.

3. Voltage start circuit: ENB is at high voltage level, outputting high voltage to light up the backlight tube of the Panel

4. PWM controller: It consists of the following functions: internal reference voltage, error amplifier, oscillator and PWM, overvoltage protection, undervoltage protection, short circuit protection,
and output transistor

5. DC conversion: A voltage conversion circuit composed of a MoS switch transistor and an energy storage inductor. The input pulse is amplified by a push-pull amplifier and drives the MOS
transistor to perform switching action, causing the DC voltage to charge and discharge the inductor, so that the other end of the inductor can receive AC voltage

6. LC oscillation and output circuit: Ensure the 1600 voltage required for lamp start, and reduce the voltage to 800V7 after lamp start. Output voltage feedback: When the load is working,
feedback the sampling voltage to stabilize the voltage output of the inverter.