The working principle of the inverter is to control the operation of the entire system through a control circuit. The inverter circuit completes the function of converting direct current to alternating current, and the filter circuit is used to filter out unwanted signals.

The work of the inverter circuit can also be refined as follows: first, the oscillating circuit converts direct current into alternating current; secondly, the coil boosts the irregular alternating current into square wave alternating current; finally, rectification makes the alternating current into a sine wave alternating current through a square wave.

The working principle of each part of the inverter

1. Input interface part: Akụkụ ntinye nwere 3 akara, 12Ntinye VIN DC, na-arụ ọrụ na-eme ka voltaji ENB na akara ngosi njikwa ugbu a DIM. Ihe nkwụnye na-eweta VIN, na voltaji ENB bụ nke MCU na-enye na motherboard, and its value is 0 ma ọ bụ 3V. Mgbe ENB = 0, onye inverter anaghị arụ ọrụ, na mgbe ENB=3V, the inverter is in normal working state; while the DIM voltage Provided by the main board, the range of variation is between 0-5V. Different DIM values ​​are fed back to the feedback terminal of the PWM controller. Nke ugbu a nyere site inverter na ibu ga-adịkwa iche. Ọnụ ahịa DIM dị ntakịrị, the current output by the inverter. Nke ka ukwuu.

2. Voltage start circuit: When ENB is at high level, it outputs high voltage to light the panel's backlight tube.

3. Onye njikwa PWM: O nwere ọrụ ndị a: esịtidem ntụaka voltaji, amplifier njehie, oscillator na PWM, over-voltage protection, nchebe n'okpuru voltaji, short-circuit protection, output transistor.

4. Ntughari DC: The voltage conversion circuit is composed of MOS switch tube and energy storage inductor. The input pulse is amplified by the push-pull amplifier and then drives the MOS tube to switch, so that the DC voltage can charge and discharge the inductor, so that the other end of the inductor can be Obtain AC voltage.

5. LC oscillation na mmepụta sekit: to ensure the 1600V voltage required for the lamp to start, and to reduce the voltage to 800V after the lamp is started.

6. Nzaghachi voltaji pụta: Mgbe ibu na-arụ ọrụ, the sampled voltage is fed back to stabilize the voltage output of the inverter