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: Beşa têketinê heye 3 sînyalên, 12V ketina DC VIN, dixebitin voltaja ENB û îşaretek kontrolê ya panelê DIM çalak bikin. VIN ji hêla Adapter ve tê peyda kirin, û voltaja ENB ji hêla MCU ve li ser motherboard ve tê peyda kirin, and its value is 0 an jî 3V. Dema ku ENB = 0, inverter naxebite, û gava 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. Hêza ku ji hêla inverterê ve ji barkirinê re peyda dike jî dê cûda be. Nirxa DIM-ê ya piçûktir, the current output by the inverter. Ya mezintir.

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

3. Kontrolkerê PWM: Ew fonksiyonên jêrîn hene: voltaja referansa navxweyî, amplifikatorê çewtiyê, oscillator û PWM, parastina zêde-voltaja, parastina bin-voltaja, parastina çerxa kurt, output transistor.

4. veguherîna 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. sîlasyona LC û çerxa derketinê: to ensure the 1600V voltage required for the lamp to start, and to reduce the voltage to 800V after the lamp is started.

6. Bersiva voltaja derketinê: Dema ku bar dixebitin, the sampled voltage is fed back to stabilize the voltage output of the inverter