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: Ingxenye yegalelo ine 3 iimpawu, 12V DC igalelo VIN, ukusebenza kwenza amandla ombane ENB kunye nePaneli yolawulo lwangoku uphawu DIM. I-VIN inikezelwa yi-Adapter, kunye ne-ENB yombane ibonelelwa yi-MCU kwi-motherboard, and its value is 0 okanye 3V. Xa ENB=0, i-inverter ayisebenzi, kwaye xa 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. Ikhoyo ngoku enikezelwa yi-inverter kumthwalo nayo iya kuhluka. Lincinci ixabiso le-DIM, the current output by the inverter. Enkulu.

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

3. Umlawuli we-PWM: Inemisebenzi elandelayo: Umbane wesalathiso sangaphakathi, iamplifier yemposiso, oscillator kunye ne-PWM, ukhuseleko lwamandla ombane ngaphezulu, ukukhuselwa ngaphantsi kombane, ukhuseleko lwesekethe emfutshane, output transistor.

4. Ukuguqulwa kweDC: 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. I-LC oscillation kunye nesekethe yemveliso: to ensure the 1600V voltage required for the lamp to start, and to reduce the voltage to 800V after the lamp is started.

6. Ingxelo yombane ophumayo: Xa umthwalo usebenza, the sampled voltage is fed back to stabilize the voltage output of the inverter